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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1406.5677 | Cosimo Bambi | Jiachen Jiang, Cosimo Bambi, James F. Steiner | Using iron line reverberation and spectroscopy to distinguish Kerr and
non-Kerr black holes | 1+24 pages, 17 figures. v3: refereed version | JCAP 1505 : 025, 2015 | 10.1088/1475-7516/2015/05/025 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The iron K$\alpha$ line commonly observed in the X-ray spectrum of both
stellar-mass and supermassive black hole candidates is produced by the
illumination of a cold accretion disk by a hot corona. In this framework, the
activation of a new flaring region in the hot corona imprints a time variation
on the iron line s... | [
{
"created": "Sun, 22 Jun 2014 05:15:06 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Feb 2015 17:23:01 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Apr 2015 01:37:46 GMT",
"version": "v3"
}
] | 2015-05-18 | [
[
"Jiang",
"Jiachen",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Steiner",
"James F.",
""
]
] | The iron K$\alpha$ line commonly observed in the X-ray spectrum of both stellar-mass and supermassive black hole candidates is produced by the illumination of a cold accretion disk by a hot corona. In this framework, the activation of a new flaring region in the hot corona imprints a time variation on the iron line spe... |
gr-qc/9702016 | Sher Alam | S. Alam (KEK), S. Haider(ICP) and Aurangzeb(ICP) | Cylindrical versus Spherical Resonant Antennas for Gravitational Wave
Detection | 9 pages, Revtex | null | null | KEK preprint KEK-TH-511 | gr-qc | null | The principles and detection of gravitational waves by resonant antennas are
briefly discussed. But the main purpose of this short note is to compare the
two geometries of resonant antennas, the well-known cylindrical to the
spherical type. Some features of a two sphere observatory are also discussed.
| [
{
"created": "Fri, 7 Feb 1997 05:38:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alam",
"S.",
"",
"KEK"
],
[
"Haider",
"S.",
"",
"ICP"
],
[
"Aurangzeb",
"",
"",
"ICP"
]
] | The principles and detection of gravitational waves by resonant antennas are briefly discussed. But the main purpose of this short note is to compare the two geometries of resonant antennas, the well-known cylindrical to the spherical type. Some features of a two sphere observatory are also discussed. |
1704.02434 | Yi Xie | Shan-Shan Zhao and Yi Xie | Strong deflection gravitational lensing by a modified Hayward black hole | 10 pages, 1 figure | Eur. Phys. J. C (2017) 77: 272 | 10.1140/epjc/s10052-017-4850-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A modified Hayward black hole is a nonsingular black hole. It is proposed to
form when the pressure generated by quantum gravity can stop matter's collapse
as the matter reaches Planck density. Strong deflection gravitational lensing
happening nearby its event horizon might provide some clues of these quantum
effects... | [
{
"created": "Sat, 8 Apr 2017 03:44:28 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Apr 2017 16:09:22 GMT",
"version": "v2"
}
] | 2017-05-02 | [
[
"Zhao",
"Shan-Shan",
""
],
[
"Xie",
"Yi",
""
]
] | A modified Hayward black hole is a nonsingular black hole. It is proposed to form when the pressure generated by quantum gravity can stop matter's collapse as the matter reaches Planck density. Strong deflection gravitational lensing happening nearby its event horizon might provide some clues of these quantum effects i... |
2202.12196 | Sean Julian Fortuna | Sean Fortuna, Ian Vega | Electromagnetic quasinormal modes of Schwarzschild-anti-de Sitter black
holes: Bifurcations, spectral similarity, and exact solutions in the large
black hole limit | 14 pages, 6 figures, 2 tables, edits to all sections, added boundary
condition discussion, added citations, removed section VI.B., incorporated
referee comments | Phys. Rev. D 106, 084028 (2022) | 10.1103/PhysRevD.106.084028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the peculiar electromagnetic quasinormal mode spectrum of an
asymptotically anti-de Sitter Schwarzschild black hole. Recent numerical
calculations have shown that some quasinormal mode frequencies become purely
overdamped at some critical black hole sizes, where the spectrum also
bifurcates. In this paper,... | [
{
"created": "Thu, 24 Feb 2022 16:56:04 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Feb 2022 04:07:52 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Mar 2022 05:27:16 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Oct 2022 22:14:11 GMT",
"version": "v4"
}
] | 2022-10-21 | [
[
"Fortuna",
"Sean",
""
],
[
"Vega",
"Ian",
""
]
] | We revisit the peculiar electromagnetic quasinormal mode spectrum of an asymptotically anti-de Sitter Schwarzschild black hole. Recent numerical calculations have shown that some quasinormal mode frequencies become purely overdamped at some critical black hole sizes, where the spectrum also bifurcates. In this paper, w... |
2105.06259 | Ira Wolfson | Ira Wolfson, Azadeh Maleknejad, Tomoaki Murata, Eiichiro Komatsu,
Tsutomu Kobayashi | The isotropic attractor solution of axion-SU(2) inflation: Universal
isotropization in Bianchi type-I geometry | 23 pages, 14 figures. Published 23 September 2021 Updated to
published version | JCAP09(2021)031 | 10.1088/1475-7516/2021/09/031 | CERN-TH-2021-076, RUP-21-8 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | SU(2) gauge fields coupled to an axion field can acquire an isotropic
background solution during inflation. We study homogeneous but anisotropic
inflationary solutions in the presence of such (massless) gauge fields. A gauge
field in the cosmological background may pose a threat to spatial isotropy. We
show, however,... | [
{
"created": "Wed, 12 May 2021 17:59:07 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2021 07:14:28 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Sep 2021 08:01:54 GMT",
"version": "v3"
}
] | 2021-09-28 | [
[
"Wolfson",
"Ira",
""
],
[
"Maleknejad",
"Azadeh",
""
],
[
"Murata",
"Tomoaki",
""
],
[
"Komatsu",
"Eiichiro",
""
],
[
"Kobayashi",
"Tsutomu",
""
]
] | SU(2) gauge fields coupled to an axion field can acquire an isotropic background solution during inflation. We study homogeneous but anisotropic inflationary solutions in the presence of such (massless) gauge fields. A gauge field in the cosmological background may pose a threat to spatial isotropy. We show, however, t... |
2004.10222 | Daniele Gregoris | Daniele Gregoris, Yen Chin Ong, Bin Wang | Thermodynamics of Shearing Massless Scalar Field Spacetimes is
Inconsistent With the Weyl Curvature Hypothesis | Matches published version | Phys. Rev. D 102, 023539 (2020) | 10.1103/PhysRevD.102.023539 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our Universe has an arrow of time. In accordance with the second law of
thermodynamics, entropy has been increasing ever since the Big Bang. The fact
that matter is in thermal equilibrium in the very early Universe, as indicated
by the cosmic microwave background, has led to the idea that gravitational
entropy must b... | [
{
"created": "Tue, 21 Apr 2020 18:07:19 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2020 12:39:13 GMT",
"version": "v2"
}
] | 2020-07-30 | [
[
"Gregoris",
"Daniele",
""
],
[
"Ong",
"Yen Chin",
""
],
[
"Wang",
"Bin",
""
]
] | Our Universe has an arrow of time. In accordance with the second law of thermodynamics, entropy has been increasing ever since the Big Bang. The fact that matter is in thermal equilibrium in the very early Universe, as indicated by the cosmic microwave background, has led to the idea that gravitational entropy must be ... |
1310.7295 | Yi-Xin Chen | Fei-Quan Tu, Yi-Xin Chen | Thermodynamics of the universe bounded by the cosmological event horizon
and dominated by the tachyon fluid | 12 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our aim is to investigate the thermodynamic properties of the universe
bounded by the cosmological event horizon and dominated by the tachyon fluid.
We give two different laws of evolution of our universe. Further, we show the
first law and the generalized second law of thermodynamics (GSLT) are both
satisfied in two... | [
{
"created": "Mon, 28 Oct 2013 02:20:39 GMT",
"version": "v1"
}
] | 2013-10-29 | [
[
"Tu",
"Fei-Quan",
""
],
[
"Chen",
"Yi-Xin",
""
]
] | Our aim is to investigate the thermodynamic properties of the universe bounded by the cosmological event horizon and dominated by the tachyon fluid. We give two different laws of evolution of our universe. Further, we show the first law and the generalized second law of thermodynamics (GSLT) are both satisfied in two c... |
2005.02065 | Aharon Davidson | Tomer Ygael and Aharon Davidson | Local Scale Invariant Kaluza-Klein Reduction | 11 pages, 4 figures | Phys. Rev. D 102, 024010 (2020) | 10.1103/PhysRevD.102.024010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform the 4-dimensional Kaluza-Klein (KK) reduction of the 5-dimensional
locally scale invariant Weyl-Dirac gravity. While compactification unavoidably
introduces an explicit length scale into the theory, it does it in such a way
that the KK radius can be integrated out from the low energy regime, leaving
the KK... | [
{
"created": "Tue, 5 May 2020 11:07:47 GMT",
"version": "v1"
}
] | 2020-07-03 | [
[
"Ygael",
"Tomer",
""
],
[
"Davidson",
"Aharon",
""
]
] | We perform the 4-dimensional Kaluza-Klein (KK) reduction of the 5-dimensional locally scale invariant Weyl-Dirac gravity. While compactification unavoidably introduces an explicit length scale into the theory, it does it in such a way that the KK radius can be integrated out from the low energy regime, leaving the KK v... |
gr-qc/9710025 | James Hartle | Robert B. Griffiths (Carnegie-Mellon University) and James B. Hartle
(University of California, Santa Barbara) | Comment on ``Consistent Sets Yield Contrary Inferences in Quantum
Theory'' | 2pages, uses REVTEX 3.0 | Phys.Rev.Lett. 81 (1998) 1981 | 10.1103/PhysRevLett.81.1981 | null | gr-qc hep-th quant-ph | null | In a recent paper Kent has pointed out that in consistent histories quantum
theory it is possible, given initial and final states, to construct two
different consistent families of histories, in each of which there is a
proposition that can be inferred with probability one, and such that the
projectors representing t... | [
{
"created": "Fri, 3 Oct 1997 15:26:13 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Griffiths",
"Robert B.",
"",
"Carnegie-Mellon University"
],
[
"Hartle",
"James B.",
"",
"University of California, Santa Barbara"
]
] | In a recent paper Kent has pointed out that in consistent histories quantum theory it is possible, given initial and final states, to construct two different consistent families of histories, in each of which there is a proposition that can be inferred with probability one, and such that the projectors representing the... |
1205.6795 | Farook Rahaman | Mehedi Kalam, Anisul Ain Usmani, Farook Rahaman, Sk. Monowar Hossein,
Indrani Karar and Ranjan Sharma | A relativistic model for Strange Quark Star | 12 pages, 6 figures. Major revision has been done | Int. J. Theor. Phys. (2013) 52:3319 | 10.1007/s10773-013-1629-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a spherically symmetric and anisotropic model for strange quark
stars within the framework of MIT Bag model. Though the model is found to
comply with all the physical requirements of a realistic star satisfying a
strange matter equation of state (EOS), the estimated values the Bag constant
for different st... | [
{
"created": "Wed, 30 May 2012 09:02:09 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Sep 2012 16:19:19 GMT",
"version": "v2"
}
] | 2017-11-20 | [
[
"Kalam",
"Mehedi",
""
],
[
"Usmani",
"Anisul Ain",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Hossein",
"Sk. Monowar",
""
],
[
"Karar",
"Indrani",
""
],
[
"Sharma",
"Ranjan",
""
]
] | We propose a spherically symmetric and anisotropic model for strange quark stars within the framework of MIT Bag model. Though the model is found to comply with all the physical requirements of a realistic star satisfying a strange matter equation of state (EOS), the estimated values the Bag constant for different stra... |
2011.05099 | Sergey Sushkov V | Pavel E. Kashargin, Sergey V. Sushkov | Collapsing Wormholes Sustained by Dustlike Matter | null | Universe 2020, 6, 186 | 10.3390/universe6100186 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | It is well known that static wormhole configurations in general relativity
(GR) are possible only if matter threading the wormhole throat is
"exotic"---i.e., violates a number of energy conditions. For this reason, it is
impossible to construct {static} wormholes supported only by dust-like matter
which satisfies all... | [
{
"created": "Tue, 10 Nov 2020 13:52:07 GMT",
"version": "v1"
}
] | 2020-11-11 | [
[
"Kashargin",
"Pavel E.",
""
],
[
"Sushkov",
"Sergey V.",
""
]
] | It is well known that static wormhole configurations in general relativity (GR) are possible only if matter threading the wormhole throat is "exotic"---i.e., violates a number of energy conditions. For this reason, it is impossible to construct {static} wormholes supported only by dust-like matter which satisfies all u... |
2305.06724 | Thomas Thiemann | Thomas Thiemann | Quantum gravity in the triangular gauge | null | null | null | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vielbeins are necessary when coupling General Relativity (GR) to fermionic
matter. This enhances the gauge group of GR to include local Lorentz
transformations.
In view of a reduced phase space formulation of quantum gravity, in this work
we completely gauge fix that Lorentz gauge symmetry by using a so-called
tria... | [
{
"created": "Thu, 11 May 2023 10:59:16 GMT",
"version": "v1"
}
] | 2023-05-12 | [
[
"Thiemann",
"Thomas",
""
]
] | Vielbeins are necessary when coupling General Relativity (GR) to fermionic matter. This enhances the gauge group of GR to include local Lorentz transformations. In view of a reduced phase space formulation of quantum gravity, in this work we completely gauge fix that Lorentz gauge symmetry by using a so-called triangul... |
gr-qc/9608014 | null | Brien C. Nolan (Dublin City University) | An Analysis of Wave Tails based on the Geometric Optics Approximation | 21 pages, plain latex replaces revtex version. One figure, hard copy
available on request from author | null | null | null | gr-qc | null | The effect of the existence of tails on the propagation of scalar waves in
curved space-time is considered via an analysis of flux integrals of the
energy-stress-momentum tensor of the waves. The geometric optics approximation
is formulated in terms of such flux integrals, and three examples are
investigated in detai... | [
{
"created": "Tue, 6 Aug 1996 10:55:57 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 1996 09:36:47 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Nolan",
"Brien C.",
"",
"Dublin City University"
]
] | The effect of the existence of tails on the propagation of scalar waves in curved space-time is considered via an analysis of flux integrals of the energy-stress-momentum tensor of the waves. The geometric optics approximation is formulated in terms of such flux integrals, and three examples are investigated in detail ... |
gr-qc/0104018 | Anzhong Wang | A.Y. Miguelote, M.F.A. da Silva, A.Z. Wang and N.O. Santos | Levi-Civita Solutions Coupled with Electromagnetic Fields | Typed in Revtex, including two figures | Class.Quant.Grav.18:4569-4588,2001 | 10.1088/0264-9381/18/21/312 | null | gr-qc | null | The local and global properties of the Levi-Civita (LC) solutions coupled
with an electromagnetic field are studied and some limits to the vacuum LC
solutions are given. By doing such limits, the physical and geometrical
interpretations of the free parameters involved in the solutions are made
clear. Sources for both... | [
{
"created": "Wed, 4 Apr 2001 22:15:32 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Miguelote",
"A. Y.",
""
],
[
"da Silva",
"M. F. A.",
""
],
[
"Wang",
"A. Z.",
""
],
[
"Santos",
"N. O.",
""
]
] | The local and global properties of the Levi-Civita (LC) solutions coupled with an electromagnetic field are studied and some limits to the vacuum LC solutions are given. By doing such limits, the physical and geometrical interpretations of the free parameters involved in the solutions are made clear. Sources for both t... |
gr-qc/0605086 | James Lindesay | James Lindesay | Diagonal Forms of a Dual Scale Cosmology | 5 pages | null | null | null | gr-qc | null | A hybrid metric with off-diagonal temporal-radial behavior that was
constructed to conveniently parameterized the early and late time behaviors of
the universe is shown to have diagonal forms consistent with Robertson-Walker
and deSitter geometries. The dynamics of the energy content of the cosmology as
parameterized... | [
{
"created": "Sun, 14 May 2006 18:29:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lindesay",
"James",
""
]
] | A hybrid metric with off-diagonal temporal-radial behavior that was constructed to conveniently parameterized the early and late time behaviors of the universe is shown to have diagonal forms consistent with Robertson-Walker and deSitter geometries. The dynamics of the energy content of the cosmology as parameterized b... |
1501.04217 | Polina Dyadina | S.O. Alexeyev, K.A. Rannu, P.I. Dyadina, B.N. Latosh, S.G. Turyshev | Observational Limits on Gauss-Bonnet and Randall-Sundrum Gravities | 7 pages, accepted to JETP | JETP 147 (6), 1120-1127 (2015) | 10.7868/S0044451015060051 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the possibilities of experimental search for new physics predicted
by the Gauss-Bonnet and the Randall-Sundrum theories of gravity. The effective
four-dimensional spherically-symmetrical solutions of these theories are
analyzed. We consider these solutions in the weak-field limit and in the
process of the ... | [
{
"created": "Sat, 17 Jan 2015 17:44:08 GMT",
"version": "v1"
}
] | 2015-05-21 | [
[
"Alexeyev",
"S. O.",
""
],
[
"Rannu",
"K. A.",
""
],
[
"Dyadina",
"P. I.",
""
],
[
"Latosh",
"B. N.",
""
],
[
"Turyshev",
"S. G.",
""
]
] | We discuss the possibilities of experimental search for new physics predicted by the Gauss-Bonnet and the Randall-Sundrum theories of gravity. The effective four-dimensional spherically-symmetrical solutions of these theories are analyzed. We consider these solutions in the weak-field limit and in the process of the pr... |
1304.0330 | Jeandrew Brink | Jeandrew Brink, Marisa Geyer and Tanja Hinderer | Orbital resonances around Black holes | 5 pages, 5 figures | Phys. Rev. Lett. 114, 081102 (2015) | 10.1103/PhysRevLett.114.081102 | null | gr-qc astro-ph.GA math.CA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the length and timescales associated with resonant orbits in the
Kerr Metric for all orbital and spin parameters. Resonance induced effects are
potentially observable when the Event Horizon telescope resolves the inner
structure of Sgr A*, space-based gravitational wave detectors record
phase-shifts in the... | [
{
"created": "Mon, 1 Apr 2013 11:01:36 GMT",
"version": "v1"
}
] | 2015-03-05 | [
[
"Brink",
"Jeandrew",
""
],
[
"Geyer",
"Marisa",
""
],
[
"Hinderer",
"Tanja",
""
]
] | We compute the length and timescales associated with resonant orbits in the Kerr Metric for all orbital and spin parameters. Resonance induced effects are potentially observable when the Event Horizon telescope resolves the inner structure of Sgr A*, space-based gravitational wave detectors record phase-shifts in the w... |
gr-qc/0107102 | Claus Kiefer | Petr Hajicek and Claus Kiefer | Singularity avoidance by collapsing shells in quantum gravity | 5 pages, 1 figure, received honorable mention in the 2001 essay
competititon, to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D10 (2001) 775-780 | 10.1142/S0218271801001578 | null | gr-qc | null | We discuss a model describing exactly a thin spherically symmetric shell of
matter with zero rest mass. We derive the reduced formulation of this system in
which the variables are embeddings, their conjugate momenta, and Dirac
observables. A non-perturbative quantum theory of this model is then
constructed, leading t... | [
{
"created": "Tue, 31 Jul 2001 10:28:36 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hajicek",
"Petr",
""
],
[
"Kiefer",
"Claus",
""
]
] | We discuss a model describing exactly a thin spherically symmetric shell of matter with zero rest mass. We derive the reduced formulation of this system in which the variables are embeddings, their conjugate momenta, and Dirac observables. A non-perturbative quantum theory of this model is then constructed, leading to ... |
1304.6131 | Hugo Ferreira | Hugo R. C. Ferreira | Stability of warped AdS3 black holes in Topologically Massive Gravity
under scalar perturbations | 23 pages, 10 figures | null | 10.1103/PhysRevD.87.124013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the warped AdS3 black hole solutions of Topologically
Massive Gravity are classically stable against massive scalar field
perturbations by analysing the quasinormal and bound state modes of the scalar
field. In particular, it is found that although classical superradiance is
present it does not gi... | [
{
"created": "Mon, 22 Apr 2013 23:01:39 GMT",
"version": "v1"
},
{
"created": "Fri, 24 May 2013 14:58:36 GMT",
"version": "v2"
}
] | 2013-07-08 | [
[
"Ferreira",
"Hugo R. C.",
""
]
] | We demonstrate that the warped AdS3 black hole solutions of Topologically Massive Gravity are classically stable against massive scalar field perturbations by analysing the quasinormal and bound state modes of the scalar field. In particular, it is found that although classical superradiance is present it does not give... |
1511.01592 | Duncan Meacher | Duncan Meacher, Kipp Cannon, Chad Hanna, Tania Regimbau, B. S.
Sathyaprakash | Second Einstein Telescope Mock Data and Science Challenge: Low Frequency
Binary Neutron Star Data Analysis | null | Phys. Rev. D 93, 024018 (2016) | 10.1103/PhysRevD.93.024018 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein Telescope is a conceived third generation gravitational-wave
detector that is envisioned to be an order of magnitude more sensitive than
advanced LIGO, Virgo and Kagra, which would be able to detect
gravitational-wave signals from the coalescence of compact objects with
waveforms starting as low as 1Hz. ... | [
{
"created": "Thu, 5 Nov 2015 03:09:55 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 2015 19:10:25 GMT",
"version": "v2"
}
] | 2016-01-20 | [
[
"Meacher",
"Duncan",
""
],
[
"Cannon",
"Kipp",
""
],
[
"Hanna",
"Chad",
""
],
[
"Regimbau",
"Tania",
""
],
[
"Sathyaprakash",
"B. S.",
""
]
] | The Einstein Telescope is a conceived third generation gravitational-wave detector that is envisioned to be an order of magnitude more sensitive than advanced LIGO, Virgo and Kagra, which would be able to detect gravitational-wave signals from the coalescence of compact objects with waveforms starting as low as 1Hz. Wi... |
gr-qc/9505048 | Paulo Rodrigues Lima Vargas Moniz | P.V. Moniz | Quantization of the Bianchi type-IX model in N=1 Supergravity in the
Presence of Supermatter | 43 pages, TeX (some minor font problems may occur, just press
Return), TeX macro for table at the end of file | Int.J.Mod.Phys.A11:1763-1796,1996 | 10.1142/S0217751X96000948 | DAMTP R95/21 | gr-qc | null | The general theory of N=1 supergravity with supermatter is applied to a
Bianchi type IX diagonal model. The supermatter is constituted by a complex
scalar field and its spin-$1\over 2$ fermionic partners. The K\"ahler geometry
is chosen to be a two-dimensional flat one. The Lorentz invariant Ansatz for
the wave funct... | [
{
"created": "Mon, 29 May 1995 11:27:30 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Moniz",
"P. V.",
""
]
] | The general theory of N=1 supergravity with supermatter is applied to a Bianchi type IX diagonal model. The supermatter is constituted by a complex scalar field and its spin-$1\over 2$ fermionic partners. The K\"ahler geometry is chosen to be a two-dimensional flat one. The Lorentz invariant Ansatz for the wave functio... |
1608.00165 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Dark Energy Oscillations in Mimetic $F(R)$ Gravity | PRD accepted | null | 10.1103/PhysRevD.94.044012 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we address the problem of dark energy oscillations in the
context of mimetic $F(R)$ gravity with potential. The issue of dark energy
oscillations can be a problem in some models of ordinary $F(R)$ gravity and a
remedy that can make the oscillations milder is to introduce additional
modifications in the ... | [
{
"created": "Sat, 30 Jul 2016 21:03:45 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this paper we address the problem of dark energy oscillations in the context of mimetic $F(R)$ gravity with potential. The issue of dark energy oscillations can be a problem in some models of ordinary $F(R)$ gravity and a remedy that can make the oscillations milder is to introduce additional modifications in the fu... |
2306.11787 | Abhishek Chowdhuri | Abhishek Chowdhuri, Rishabh Kumar Singh, Kaushik Kangsabanik, Arpan
Bhattacharyya | Gravitational Radiation from hyperbolic encounters in the presence of
dark matter | 48 pages, 15 figures, Calculation of Braking Index is added,
Eccentricity evolution as a function true anomaly for dark matter profile
taking into account correction due to Baryonic matter and annihilation region
has been added, Abstract and References updated, Typos corrected, Accepted
for publication in Physi... | Phys. Rev. D 109, 124056 (2024) | 10.1103/PhysRevD.109.124056 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we look into binaries undergoing gravitational radiation
during a hyperbolic passage. Such hyperbolic events can be a credible source of
gravitational waves in future detectors. We systematically calculate fluxes of
gravitational radiation from such events in the presence of dark matter with
different ... | [
{
"created": "Tue, 20 Jun 2023 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 24 May 2024 05:17:37 GMT",
"version": "v2"
}
] | 2024-06-25 | [
[
"Chowdhuri",
"Abhishek",
""
],
[
"Singh",
"Rishabh Kumar",
""
],
[
"Kangsabanik",
"Kaushik",
""
],
[
"Bhattacharyya",
"Arpan",
""
]
] | In this study, we look into binaries undergoing gravitational radiation during a hyperbolic passage. Such hyperbolic events can be a credible source of gravitational waves in future detectors. We systematically calculate fluxes of gravitational radiation from such events in the presence of dark matter with different pr... |
1511.00110 | Kota Ogasawara | Kota Ogasawara, Tomohiro Harada, and Umpei Miyamoto | High efficiency of collisional Penrose process requires heavy particle
production | 18 pages, 1 figure | Phys. Rev. D 93, 044054 (2016) | 10.1103/PhysRevD.93.044054 | RUP-15-24 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The center-of-mass energy of two particles can become arbitrarily large if
they collide near the event horizon of an extremal Kerr black hole, which is
called the Ba$\rm \tilde n$ados-Silk-West (BSW) effect. We consider such a
high-energy collision of two particles which started from infinity and follow
geodesics in ... | [
{
"created": "Sat, 31 Oct 2015 10:44:13 GMT",
"version": "v1"
}
] | 2016-03-02 | [
[
"Ogasawara",
"Kota",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Miyamoto",
"Umpei",
""
]
] | The center-of-mass energy of two particles can become arbitrarily large if they collide near the event horizon of an extremal Kerr black hole, which is called the Ba$\rm \tilde n$ados-Silk-West (BSW) effect. We consider such a high-energy collision of two particles which started from infinity and follow geodesics in th... |
gr-qc/0209010 | Stephen | Stephen A. Ramsey | Nonequilibrium dynamics of quantum fields in inflationary cosmology | Doctoral dissertation published in December 1997, University of
Maryland, College Park, MD, USA. 212 pages; 23 figures; AMS-LaTeX format | null | null | null | gr-qc | null | The nonequilibrium dynamics of quantum fields is studied in inflationary
cosmology, with particular emphasis on applications to the problem of
post-inflation reheating. The Schwinger-Keldysh closed-time-path (CTP)
formalism is utilized along with the two-particle-irreducible (2PI) effective
action in order to obtain ... | [
{
"created": "Tue, 3 Sep 2002 19:08:52 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Sep 2002 20:48:18 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ramsey",
"Stephen A.",
""
]
] | The nonequilibrium dynamics of quantum fields is studied in inflationary cosmology, with particular emphasis on applications to the problem of post-inflation reheating. The Schwinger-Keldysh closed-time-path (CTP) formalism is utilized along with the two-particle-irreducible (2PI) effective action in order to obtain co... |
gr-qc/0504023 | Chris Clarkson | Sanjeev S. Seahra, Chris Clarkson and Roy Maartens (ICG, Portsmouth) | Delocalization of brane gravity by a bulk black hole | 7 pages, 6 figures | Class.Quant.Grav. 22 (2005) L91-L102 | 10.1088/0264-9381/22/16/L02 | null | gr-qc hep-th | null | We investigate the analogue of the Randall-Sundrum brane-world in the case
when the bulk contains a black hole. Instead of the static vacuum Minkowski
brane of the RS model, we have an Einstein static vacuum brane. We find that
the presence of the bulk black hole has a dramatic effect on the gravity that
is felt by b... | [
{
"created": "Wed, 6 Apr 2005 13:47:24 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Seahra",
"Sanjeev S.",
"",
"ICG, Portsmouth"
],
[
"Clarkson",
"Chris",
"",
"ICG, Portsmouth"
],
[
"Maartens",
"Roy",
"",
"ICG, Portsmouth"
]
] | We investigate the analogue of the Randall-Sundrum brane-world in the case when the bulk contains a black hole. Instead of the static vacuum Minkowski brane of the RS model, we have an Einstein static vacuum brane. We find that the presence of the bulk black hole has a dramatic effect on the gravity that is felt by bra... |
1105.0885 | Gergely Sz\'ekely | Hajnal Andr\'eka and Istv\'an N\'emeti and Judit X. Madar\'asz and
Gergely Sz\'ekely | On Logical Analysis of Relativity Theories | 19 pages, 1 figures | Hungarian Philosophical Review, 2010/4, pp.204-222 | null | null | gr-qc math-ph math.LO math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this paper is to give an introduction to our axiomatic logical
analysis of relativity theories.
| [
{
"created": "Wed, 4 May 2011 18:10:51 GMT",
"version": "v1"
}
] | 2012-03-27 | [
[
"Andréka",
"Hajnal",
""
],
[
"Németi",
"István",
""
],
[
"Madarász",
"Judit X.",
""
],
[
"Székely",
"Gergely",
""
]
] | The aim of this paper is to give an introduction to our axiomatic logical analysis of relativity theories. |
gr-qc/0105070 | Margarita Safonova | Margarita Safonova (University of Delhi, India), Diego F. Torres and
Gustavo E. Romero (Instituto Argentino de Radioastronom\'ia, Buenos Aires,
Argentina) | Microlensing by natural wormholes: theory and simulations | 16 pages, 24 postscript figures (3 coloured), revtex style, submitted
to Phys. Rev. D | Phys.Rev. D65 (2002) 023001 | 10.1103/PhysRevD.65.023001 | null | gr-qc astro-ph hep-th | null | We provide an in depth study of the theoretical peculiarities that arise in
effective negative mass lensing, both for the case of a point mass lens and
source, and for extended source situations. We describe novel observational
signatures arising in the case of a source lensed by a negative mass. We show
that a negat... | [
{
"created": "Fri, 18 May 2001 20:40:33 GMT",
"version": "v1"
}
] | 2016-08-16 | [
[
"Safonova",
"Margarita",
"",
"University of Delhi, India"
],
[
"Torres",
"Diego F.",
"",
"Instituto Argentino de Radioastronomía, Buenos Aires,\n Argentina"
],
[
"Romero",
"Gustavo E.",
"",
"Instituto Argentino de Radioastronomía, Buenos Aires,\n Argentina... | We provide an in depth study of the theoretical peculiarities that arise in effective negative mass lensing, both for the case of a point mass lens and source, and for extended source situations. We describe novel observational signatures arising in the case of a source lensed by a negative mass. We show that a negativ... |
gr-qc/9907030 | Mario La Camera | A. G. Agnese, M. La Camera (INFN) | Kerr-AdS and Kerr-dS solutions revisited | 14 pages, Latex2e, 3 figures | Phys.Rev. D61 (2000) 087502 | 10.1103/PhysRevD.61.087502 | null | gr-qc | null | We reconsider the Kerr metric with cosmological term $\Lambda$ imposing the
condition that the angular velocity $\omega$ of the dragging of the inertial
frames vanishes at spatial boundaries. Some properties of the extreme black
holes in the revisited solutions are discussed.
| [
{
"created": "Wed, 7 Jul 1999 16:22:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Agnese",
"A. G.",
"",
"INFN"
],
[
"La Camera",
"M.",
"",
"INFN"
]
] | We reconsider the Kerr metric with cosmological term $\Lambda$ imposing the condition that the angular velocity $\omega$ of the dragging of the inertial frames vanishes at spatial boundaries. Some properties of the extreme black holes in the revisited solutions are discussed. |
gr-qc/9810090 | Mark D. Roberts | Mark D. Roberts | An Expansion Term In Hamilton's Equations | 10 pages | Europhys.Lett.45:26-31,1999 | 10.1209/epl/i1999-00126-5 | null | gr-qc math.SG | null | For any given spacetime the choice of time coordinate is undetermined. A
particular choice is the absolute time associated with a preferred vector
field. Using the absolute time Hamilton's equations are
$- (\delta H_{c})/(\delta q)=\dot{\pi}+\Theta\pi,
$+ (\delta H_{c})/(\delta \pi)=\dot{q}$,
where $\Theta = V^... | [
{
"created": "Fri, 30 Oct 1998 13:48:28 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Jan 1999 12:41:38 GMT",
"version": "v2"
}
] | 2011-04-04 | [
[
"Roberts",
"Mark D.",
""
]
] | For any given spacetime the choice of time coordinate is undetermined. A particular choice is the absolute time associated with a preferred vector field. Using the absolute time Hamilton's equations are $- (\delta H_{c})/(\delta q)=\dot{\pi}+\Theta\pi, $+ (\delta H_{c})/(\delta \pi)=\dot{q}$, where $\Theta = V^{a}_{.;a... |
2312.16324 | Vasilis Oikonomou | V.K. Oikonomou, Gregory K. Kafanelis | Primordial Cosmology of an Emergent-like Universe from Modified Gravity:
Reconstruction and Phenomenology Optimization with a Genetic Algorithm | IJMPD Accepted. arXiv admin note: text overlap with arXiv:2309.04850 | Int.J.Mod.Phys.D 33 (2024) 01, 2350114 | 10.1142/S0218271823501146 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider the realization of a variant emergent Universe
scenario in the context of $f(R)$ gravity. We use well-known reconstruction
techniques existing in the literature, and we find the approximate form of the
vacuum $f(R)$ that reproduces the specific variant emergent Universe scale
factor in the la... | [
{
"created": "Tue, 26 Dec 2023 20:08:56 GMT",
"version": "v1"
}
] | 2024-03-18 | [
[
"Oikonomou",
"V. K.",
""
],
[
"Kafanelis",
"Gregory K.",
""
]
] | In this work we consider the realization of a variant emergent Universe scenario in the context of $f(R)$ gravity. We use well-known reconstruction techniques existing in the literature, and we find the approximate form of the vacuum $f(R)$ that reproduces the specific variant emergent Universe scale factor in the larg... |
1403.3190 | Mehdi Assanioussi | Emanuele Alesci, Mehdi Assanioussi, Jerzy Lewandowski | A curvature operator for LQG | 20 pages; Labels on figure 4 and figure 5 adjusted and some
references corrected | Phys. Rev. D 89, 124017 (2014) | 10.1103/PhysRevD.89.124017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new operator in Loop Quantum Gravity - the 3D curvature
operator - related to the 3-dimensional scalar curvature. The construction is
based on Regge Calculus. We define it starting from the classical expression of
the Regge curvature, then we derive its properties and discuss some explicit
checks of th... | [
{
"created": "Thu, 13 Mar 2014 08:11:39 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 2014 11:11:33 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Apr 2014 11:00:29 GMT",
"version": "v3"
},
{
"created": "Wed, 18 Jun 2014 12:20:52 GMT",
"version": "v4"
}
] | 2014-06-25 | [
[
"Alesci",
"Emanuele",
""
],
[
"Assanioussi",
"Mehdi",
""
],
[
"Lewandowski",
"Jerzy",
""
]
] | We introduce a new operator in Loop Quantum Gravity - the 3D curvature operator - related to the 3-dimensional scalar curvature. The construction is based on Regge Calculus. We define it starting from the classical expression of the Regge curvature, then we derive its properties and discuss some explicit checks of the ... |
2007.07744 | Peng Wang | Xiaobo Guo, Kangkai Liang, Benrong Mu, Peng Wang, Mingtao Yang | Minimal Length Effects on Motion of a Particle in Rindler Space | v1: 23 pages, 8 figures; v2: 24 pages, 8 figures, references added | null | null | CTP-SCU/2020022 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various quantum theories of gravity predict the existence of a minimal
measurable length. In this paper, we study effects of the minimal length on the
motion of a particle in the Rindler space under a harmonic potential. This toy
model captures key features of particle dynamics near a black hole horizon, and
allows u... | [
{
"created": "Wed, 15 Jul 2020 15:20:25 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jul 2020 12:59:30 GMT",
"version": "v2"
}
] | 2020-07-22 | [
[
"Guo",
"Xiaobo",
""
],
[
"Liang",
"Kangkai",
""
],
[
"Mu",
"Benrong",
""
],
[
"Wang",
"Peng",
""
],
[
"Yang",
"Mingtao",
""
]
] | Various quantum theories of gravity predict the existence of a minimal measurable length. In this paper, we study effects of the minimal length on the motion of a particle in the Rindler space under a harmonic potential. This toy model captures key features of particle dynamics near a black hole horizon, and allows us ... |
1811.01805 | Alberto Mangiagli | Alberto Mangiagli, Antoine Klein, Alberto Sesana, Enrico Barausse,
Monica Colpi | Post-Newtonian phase accuracy requirements for stellar black hole
binaries with LISA | 11 pages, 6 figures. Submitted to Physical Review D | Phys. Rev. D 99, 064056 (2019) | 10.1103/PhysRevD.99.064056 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Laser Interferometer Space Antenna (LISA) will observe black hole
binaries of stellar origin during their gravitational wave inspiral, months to
years before coalescence. Due to the long duration of the signal in the LISA
band, a faithful waveform is necessary in order to keep track of the binary
phase. This is c... | [
{
"created": "Mon, 5 Nov 2018 15:43:20 GMT",
"version": "v1"
}
] | 2019-04-03 | [
[
"Mangiagli",
"Alberto",
""
],
[
"Klein",
"Antoine",
""
],
[
"Sesana",
"Alberto",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Colpi",
"Monica",
""
]
] | The Laser Interferometer Space Antenna (LISA) will observe black hole binaries of stellar origin during their gravitational wave inspiral, months to years before coalescence. Due to the long duration of the signal in the LISA band, a faithful waveform is necessary in order to keep track of the binary phase. This is cru... |
0808.1735 | Joel Saavedra | Ramon Becar, Pablo Gonzalez, Gustavo Pulgar, and Joel Saavedra | Hawking radiation via Anomaly and Tunneling method from Unruh's and
Canonical acoustic black hole | 7 pages. One section was added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking radiation from Unruh's and Canonical acoustic black hole is
considered from viewpoint of anomaly cancellation method developed by Robinson
and Wilczek. Thus, the physics near the horizon can be described using an
infinite collection of massless two-dimensional scalar fields in the background
of a dilaton and ... | [
{
"created": "Tue, 12 Aug 2008 20:35:32 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2009 15:02:57 GMT",
"version": "v2"
}
] | 2009-08-13 | [
[
"Becar",
"Ramon",
""
],
[
"Gonzalez",
"Pablo",
""
],
[
"Pulgar",
"Gustavo",
""
],
[
"Saavedra",
"Joel",
""
]
] | Hawking radiation from Unruh's and Canonical acoustic black hole is considered from viewpoint of anomaly cancellation method developed by Robinson and Wilczek. Thus, the physics near the horizon can be described using an infinite collection of massless two-dimensional scalar fields in the background of a dilaton and th... |
1207.1046 | Lawrence Crowell | Lawrence B. Crowell | Noncommutative geometry of AdS coordinates on a D-brane | submitted to EJTP | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this short paper the noncommutative geometry and quantization of branes
and the AdS is discussed. The question in part addresses an open problem left
by this author in [1] on how branes are generated by stringy physics. The
breaking of an open type I string into two strings generates a nascent brane at
the new end... | [
{
"created": "Mon, 2 Jul 2012 18:19:38 GMT",
"version": "v1"
}
] | 2012-07-05 | [
[
"Crowell",
"Lawrence B.",
""
]
] | In this short paper the noncommutative geometry and quantization of branes and the AdS is discussed. The question in part addresses an open problem left by this author in [1] on how branes are generated by stringy physics. The breaking of an open type I string into two strings generates a nascent brane at the new endpo... |
0811.4721 | Jan Metzger | Lars Andersson, Marc Mars, Jan Metzger, Walter Simon | The time evolution of marginally trapped surfaces | 21 pages. This revision corrects some typos and contains more
detailed proofs than the original version | Class.Quant.Grav.26:085018,2009 | 10.1088/0264-9381/26/8/085018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous work we have shown the existence of a dynamical horizon or
marginally trapped tube (MOTT) containing a given strictly stable marginally
outer trapped surface (MOTS). In this paper we show some results on the global
behavior of MOTTs assuming the null energy condition. In particular we show
that MOTSs pers... | [
{
"created": "Fri, 28 Nov 2008 14:07:07 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2009 09:02:43 GMT",
"version": "v2"
}
] | 2009-04-17 | [
[
"Andersson",
"Lars",
""
],
[
"Mars",
"Marc",
""
],
[
"Metzger",
"Jan",
""
],
[
"Simon",
"Walter",
""
]
] | In previous work we have shown the existence of a dynamical horizon or marginally trapped tube (MOTT) containing a given strictly stable marginally outer trapped surface (MOTS). In this paper we show some results on the global behavior of MOTTs assuming the null energy condition. In particular we show that MOTSs persis... |
gr-qc/9707046 | Bahman K. Darian | B. K. Darian | Solving the Hamilton-Jacobi equation for gravitationally interacting
electromagnetic and scalar fields | 14 pages, uses amsmath,amssymb, referees' suggestions implemented, to
appear in Classical and Quantum Gravity | Class.Quant.Grav. 15 (1998) 143-152 | 10.1088/0264-9381/15/1/010 | Alberta THY 17-97 | gr-qc hep-th | null | The spatial gradient expansion of the generating functional was recently
developed by Parry, Salopek, and Stewart to solve the Hamiltonian constraint in
Einstein-Hamilton-Jacobi theory for gravitationally interacting dust and scalar
fields. This expansion is used here to derive an order-by-order solution of the
Hamil... | [
{
"created": "Mon, 21 Jul 1997 17:10:37 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Sep 1997 21:33:57 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Darian",
"B. K.",
""
]
] | The spatial gradient expansion of the generating functional was recently developed by Parry, Salopek, and Stewart to solve the Hamiltonian constraint in Einstein-Hamilton-Jacobi theory for gravitationally interacting dust and scalar fields. This expansion is used here to derive an order-by-order solution of the Hamilto... |
gr-qc/9801050 | Gerard Clement | K.A. Bronnikov, G. Cl\'ement, C.P. Constantinidis and J.C. Fabris | Structure and stability of cold scalar-tensor black holes | 8 pages, Latex | Phys.Lett. A243 (1998) 121-127 | 10.1016/S0375-9601(98)00133-9 | GCR-98/01/02 | gr-qc | null | We study the structure and stability of the recently discussed spherically
symmetric Brans-Dicke black-hole type solutions with an infinite horizon area
and zero Hawking temperature, existing for negative values of the coupling
constant $\omega$. These solutions split into two classes: B1, whose horizon is
reached by... | [
{
"created": "Wed, 14 Jan 1998 16:11:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Clément",
"G.",
""
],
[
"Constantinidis",
"C. P.",
""
],
[
"Fabris",
"J. C.",
""
]
] | We study the structure and stability of the recently discussed spherically symmetric Brans-Dicke black-hole type solutions with an infinite horizon area and zero Hawking temperature, existing for negative values of the coupling constant $\omega$. These solutions split into two classes: B1, whose horizon is reached by a... |
gr-qc/0310122 | Rituparno Goswami | Rituparno Goswami, Pankaj S Joshi | Black hole formation in perfect fluid collapse | Revtex4, To appear in Physical Review D | Phys.Rev. D69 (2004) 027502 | 10.1103/PhysRevD.69.027502 | null | gr-qc hep-th | null | We construct here a special class of perfect fluid collapse models which
generalizes the homogeneous dust collapse solution in order to include non-zero
pressures and inhomogeneities into evolution. It is shown that a black hole is
necessarily generated as end product of continued gravitational collapse,
rather than ... | [
{
"created": "Wed, 29 Oct 2003 19:46:47 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Goswami",
"Rituparno",
""
],
[
"Joshi",
"Pankaj S",
""
]
] | We construct here a special class of perfect fluid collapse models which generalizes the homogeneous dust collapse solution in order to include non-zero pressures and inhomogeneities into evolution. It is shown that a black hole is necessarily generated as end product of continued gravitational collapse, rather than a ... |
1704.00863 | Jeffrey Winicour | Jeffrey Winicour | The Algebraic-Hyperbolic Approach to the Linearized Gravitational
Constraints on a Minkowski Background | Clarification added | null | 10.1088/1361-6382/aa7bd6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An algebraic-hyperbolic method for solving the Hamiltonian and momentum
constraints has recently been shown to be well posed for general nonlinear
perturbations of the initial data for a Schwarzschild black hole. This is a new
approach to solving the constraints of Einstein's equations which does not
involve elliptic... | [
{
"created": "Tue, 4 Apr 2017 03:10:29 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jun 2017 19:06:14 GMT",
"version": "v2"
}
] | 2017-07-26 | [
[
"Winicour",
"Jeffrey",
""
]
] | An algebraic-hyperbolic method for solving the Hamiltonian and momentum constraints has recently been shown to be well posed for general nonlinear perturbations of the initial data for a Schwarzschild black hole. This is a new approach to solving the constraints of Einstein's equations which does not involve elliptic e... |
1904.06631 | Ion I. Cotaescu | Ion I. Cotaescu | Aharonov-Bohm rings in de Sitter expanding universe | 17 pages, 2 figures, some typos corrected | General Relativity and Gravitation (2019) 51:70 | 10.1007/s10714-019-2553-y | null | gr-qc cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $(1+3)$-dimensional Dirac equation of the fermions moving in ideal
Aharonov-Bohm rings in the de Sitter expanding universe is used for deriving
the exact expressions of the general relativistic partial currents and
corresponding energies. In the de Sitter geometry, these quantities depend on
time but these are re... | [
{
"created": "Sun, 14 Apr 2019 05:36:38 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2019 15:28:28 GMT",
"version": "v2"
}
] | 2019-05-31 | [
[
"Cotaescu",
"Ion I.",
""
]
] | The $(1+3)$-dimensional Dirac equation of the fermions moving in ideal Aharonov-Bohm rings in the de Sitter expanding universe is used for deriving the exact expressions of the general relativistic partial currents and corresponding energies. In the de Sitter geometry, these quantities depend on time but these are rela... |
2305.01659 | Bivudutta Mishra Dr. | Rahul Bhagat, S.A. Narawade, B. Mishra | Weyl type $f(Q,T)$ gravity observational constrained cosmological model | 14 pages, 11 Figures. Accepted version: Physics of the Dark Universe | Physics of the Dark Universe, 41, 101250, 2023 | 10.1016/j.dark.2023.101250 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have studied the dynamical aspects of the cosmological
model of the Universe in the Weyl type $f(Q,T)$ gravity, which is an extension
of symmetric teleparallel gravity. The non-metricity scalar $Q$ has been
expressed in standard Weyl form and can be determined by a vector field
$w_{\mu}$ and the tra... | [
{
"created": "Tue, 2 May 2023 05:24:20 GMT",
"version": "v1"
}
] | 2023-06-02 | [
[
"Bhagat",
"Rahul",
""
],
[
"Narawade",
"S. A.",
""
],
[
"Mishra",
"B.",
""
]
] | In this paper, we have studied the dynamical aspects of the cosmological model of the Universe in the Weyl type $f(Q,T)$ gravity, which is an extension of symmetric teleparallel gravity. The non-metricity scalar $Q$ has been expressed in standard Weyl form and can be determined by a vector field $w_{\mu}$ and the trace... |
gr-qc/0110016 | Toyoki Matsuyama | M. Kenmoku, T. Matsuyama, R. Sato and S. Uchida | Classical and Quantum Solutions of 2+1 Dimensional Gravity under De
Broglie-Bohm Interpretation | 18pages, 3figures | Class.Quant.Grav. 19 (2002) 799-810 | 10.1088/0264-9381/19/4/311 | null | gr-qc | null | We have studied classical and quantum solutions of 2+1 dimensional Einstein
gravity theory. Quantum theory is defined through the local conserved angular
momentum and mass operators in the case of spherically symmetric space-time.
The de Broglie-Bohm interpretation is applied for the wave function and we
derive the d... | [
{
"created": "Tue, 2 Oct 2001 09:26:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kenmoku",
"M.",
""
],
[
"Matsuyama",
"T.",
""
],
[
"Sato",
"R.",
""
],
[
"Uchida",
"S.",
""
]
] | We have studied classical and quantum solutions of 2+1 dimensional Einstein gravity theory. Quantum theory is defined through the local conserved angular momentum and mass operators in the case of spherically symmetric space-time. The de Broglie-Bohm interpretation is applied for the wave function and we derive the dif... |
1910.06978 | Justin Feng | Justin C. Feng and Sante Carloni | New class of generalized coupling theories | 19 pages, 1 table, 3 figures. Minor revisions, added references.
Matches published version | Phys. Rev. D 101, 064002 (2020) | 10.1103/PhysRevD.101.064002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new class of gravity theories which are characterized by a
nontrivial coupling between the gravitational metric and matter mediated by an
auxiliary rank-2 tensor. The actions generating the field equations are
constructed so that these theories are equivalent to general relativity in a
vacuum, and only d... | [
{
"created": "Tue, 15 Oct 2019 18:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Mar 2020 20:30:41 GMT",
"version": "v2"
}
] | 2020-03-05 | [
[
"Feng",
"Justin C.",
""
],
[
"Carloni",
"Sante",
""
]
] | We propose a new class of gravity theories which are characterized by a nontrivial coupling between the gravitational metric and matter mediated by an auxiliary rank-2 tensor. The actions generating the field equations are constructed so that these theories are equivalent to general relativity in a vacuum, and only dif... |
1209.3623 | Christine Cordula Dantas | Christine C. Dantas | An Approach to Loop Quantum Cosmology Through Integrable Discrete
Heisenberg Spin Chains | 6 pages, accepted for publication in Foundations of Physics; minor
changes in accordance with referee's suggestion | Foundations of Physics, Volume 43, Issue 2, pp 236-242, 2013 | 10.1007/s10701-012-9692-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum evolution equation of Loop Quantum Cosmology (LQC) -- the quantum
Hamiltonian constraint -- is a difference equation. We relate the LQC
constraint equation in vacuum Bianchi I separable (locally rotationally
symmetric) models with an integrable differential-difference nonlinear
Schr\"odinger type equation... | [
{
"created": "Mon, 17 Sep 2012 10:50:54 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2012 10:39:09 GMT",
"version": "v2"
}
] | 2013-01-25 | [
[
"Dantas",
"Christine C.",
""
]
] | The quantum evolution equation of Loop Quantum Cosmology (LQC) -- the quantum Hamiltonian constraint -- is a difference equation. We relate the LQC constraint equation in vacuum Bianchi I separable (locally rotationally symmetric) models with an integrable differential-difference nonlinear Schr\"odinger type equation, ... |
1804.08026 | Nathan Johnson-McDaniel | Nathan K. Johnson-McDaniel, Arunava Mukherjee, Rahul Kashyap,
Parameswaran Ajith, Walter Del Pozzo, Salvatore Vitale | Constraining black hole mimickers with gravitational wave observations | 13 pages, 5 figures; v3: Accepted manuscript | Phys. Rev. D 102, 123010 (2020) | 10.1103/PhysRevD.102.123010 | LIGO-P1800092 | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LIGO and Virgo have recently observed a number of gravitational wave (GW)
signals that are fully consistent with being emitted by binary black holes
described by general relativity. However, there are theoretical proposals of
exotic objects that can be massive and compact enough to be easily confused
with black holes... | [
{
"created": "Sat, 21 Apr 2018 20:54:42 GMT",
"version": "v1"
},
{
"created": "Fri, 11 May 2018 03:51:09 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Oct 2020 03:26:13 GMT",
"version": "v3"
}
] | 2021-01-04 | [
[
"Johnson-McDaniel",
"Nathan K.",
""
],
[
"Mukherjee",
"Arunava",
""
],
[
"Kashyap",
"Rahul",
""
],
[
"Ajith",
"Parameswaran",
""
],
[
"Del Pozzo",
"Walter",
""
],
[
"Vitale",
"Salvatore",
""
]
] | LIGO and Virgo have recently observed a number of gravitational wave (GW) signals that are fully consistent with being emitted by binary black holes described by general relativity. However, there are theoretical proposals of exotic objects that can be massive and compact enough to be easily confused with black holes. ... |
2006.09489 | Abolhassan Mohammadi | Abolhassan Mohammadi, Tayeb Golanbari, Salah Nasri, and Khaled Saaidi | Brane inflation: swampland criteria, TCC, and reheating predictions | 33 pages, 11 figures, 4 tables; Sections have been revised, Title has
been modified | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider inflation in a five -dimensional space time with the inflaton
field confined to live on a brane world. In this scenario, we study different
types of potentials for the inflaton, discuss their observational consequences,
and compare with data. We find that some class of potentials are in good
agreement wit... | [
{
"created": "Tue, 16 Jun 2020 20:02:08 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jan 2021 20:26:34 GMT",
"version": "v2"
},
{
"created": "Sat, 22 Jan 2022 18:15:26 GMT",
"version": "v3"
}
] | 2022-01-25 | [
[
"Mohammadi",
"Abolhassan",
""
],
[
"Golanbari",
"Tayeb",
""
],
[
"Nasri",
"Salah",
""
],
[
"Saaidi",
"Khaled",
""
]
] | We consider inflation in a five -dimensional space time with the inflaton field confined to live on a brane world. In this scenario, we study different types of potentials for the inflaton, discuss their observational consequences, and compare with data. We find that some class of potentials are in good agreement with ... |
1404.5297 | Gerald Marsh | Gerald E. Marsh | Rigid Rotation and the Kerr Metric | 15 pages, 5 figures. This revision restructures the paper and
corrects minor typos and errors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein field equations have no known and acceptable interior solution
that can be matched to an exterior Kerr field. In particular, there are no
interior solutions that could represent objects like the Earth or other rigidly
rotating astronomical bodies. It is shown here that there exist closed surfaces
upon wh... | [
{
"created": "Sun, 20 Apr 2014 16:10:59 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Apr 2014 21:10:46 GMT",
"version": "v2"
},
{
"created": "Wed, 7 May 2014 16:23:05 GMT",
"version": "v3"
}
] | 2014-05-08 | [
[
"Marsh",
"Gerald E.",
""
]
] | The Einstein field equations have no known and acceptable interior solution that can be matched to an exterior Kerr field. In particular, there are no interior solutions that could represent objects like the Earth or other rigidly rotating astronomical bodies. It is shown here that there exist closed surfaces upon whic... |
1508.01896 | Mattias Dahl | Lars Andersson, Mattias Dahl, Gregory J. Galloway, Daniel Pollack | On the geometry and topology of initial data sets with horizons | Final version. To appear in Asian Journal of Mathematics | Asian J. Math. 22 (2018), no. 5, 863-881 | 10.4310/AJM.2018.v22.n5.a4 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the relationship between initial data sets with horizons and the
existence of metrics of positive scalar curvature. We define a Cauchy Domain of
Outer Communications (CDOC) to be an asymptotically flat initial set $(M, g,
K)$ such that the boundary $\partial M$ of $M$ is a collection of Marginally
Outer (or ... | [
{
"created": "Sat, 8 Aug 2015 13:09:05 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jan 2017 15:44:51 GMT",
"version": "v2"
}
] | 2020-08-05 | [
[
"Andersson",
"Lars",
""
],
[
"Dahl",
"Mattias",
""
],
[
"Galloway",
"Gregory J.",
""
],
[
"Pollack",
"Daniel",
""
]
] | We study the relationship between initial data sets with horizons and the existence of metrics of positive scalar curvature. We define a Cauchy Domain of Outer Communications (CDOC) to be an asymptotically flat initial set $(M, g, K)$ such that the boundary $\partial M$ of $M$ is a collection of Marginally Outer (or In... |
1606.00660 | Sinead Walsh | Sinead Walsh, Matthew Pitkin, Miquel Oliver, Sabrina D'Antonio,
Vladimir Dergachev, Andrzej Krolak, Pia Astone, Michal Bejger, Matteo Di
Giovanni, Orest Dorosh, Sergio Frasca, Paola Leaci, Simone Mastrogiovanni,
Andrew Miller, Cristiano Palomba, Maria Alessandra Papa, Ornella J. Piccinni,
Keith Riles, Orion Sau... | A comparison of methods for the detection of gravitational waves from
unknown neutron stars | 16 pages, 11 figures | Phys. Rev. D 94, 124010 (2016) | 10.1103/PhysRevD.94.124010 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rapidly rotating neutron stars are promising sources of continuous
gravitational wave radiation for the LIGO and Virgo interferometers. The
majority of neutron stars in our galaxy have not been identified with
electromagnetic observations. All-sky searches for isolated neutron stars offer
the potential to detect grav... | [
{
"created": "Thu, 2 Jun 2016 13:07:11 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2016 12:03:33 GMT",
"version": "v2"
}
] | 2016-12-14 | [
[
"Walsh",
"Sinead",
""
],
[
"Pitkin",
"Matthew",
""
],
[
"Oliver",
"Miquel",
""
],
[
"D'Antonio",
"Sabrina",
""
],
[
"Dergachev",
"Vladimir",
""
],
[
"Krolak",
"Andrzej",
""
],
[
"Astone",
"Pia",
""
],
[... | Rapidly rotating neutron stars are promising sources of continuous gravitational wave radiation for the LIGO and Virgo interferometers. The majority of neutron stars in our galaxy have not been identified with electromagnetic observations. All-sky searches for isolated neutron stars offer the potential to detect gravit... |
gr-qc/9603045 | CJ Fewster | C.J. Fewster (York), A. Higuchi (York) and C.G. Wells, (DAMTP,
Cambridge) | Classical and Quantum Initial Value Problems for Models of Chronology
Violation | 39 pages, REVTeX 3.0, 2 figures included | Phys.Rev.D54:3806-3825,1996 | 10.1103/PhysRevD.54.3806 | DAMTP-R96/11 | gr-qc hep-th | null | We study the classical and quantum theory of a class of nonlinear
differential equations on chronology violating spacetime models in which space
consists of finitely many discrete points. Classically, in the linear and
weakly nonlinear regimes (for generic choices of parameters) we prove existence
and uniqueness of s... | [
{
"created": "Mon, 25 Mar 1996 18:51:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fewster",
"C. J.",
"",
"York"
],
[
"Higuchi",
"A.",
"",
"York"
],
[
"Wells",
"C. G.",
""
]
] | We study the classical and quantum theory of a class of nonlinear differential equations on chronology violating spacetime models in which space consists of finitely many discrete points. Classically, in the linear and weakly nonlinear regimes (for generic choices of parameters) we prove existence and uniqueness of sol... |
1601.03807 | Yeuk-Kwan Edna Cheung | Yeuk-Kwan E. Cheung, Xue Song, Shuyi Li, Yunxuan Li, and Yiqing Zhu | The CST Bounce Universe model -- a parametric study | 13pages, 3 figures; reference added, in press in China Physics | SCIENCE CHINA Physics, Mechanics & Astronomy 62(1), 010011(2019); | 10.1007/s11433-018-9251-0 | NITS-PHY-2016001 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A bounce universe model with a scale-invariant and stable spectrum of
primordial density perturbations was constructed using a consistent truncation
of the D-brane dynamics from Type IIB string theory. A coupling was introduced
between the tachyon field and the adjoint Higgs field on the D3-branes to lock
the tachyon... | [
{
"created": "Fri, 15 Jan 2016 04:03:47 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2016 05:30:09 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Nov 2016 08:49:40 GMT",
"version": "v3"
},
{
"created": "Wed, 4 Jul 2018 16:30:15 GMT",
"version": "v4"
}
] | 2019-01-23 | [
[
"Cheung",
"Yeuk-Kwan E.",
""
],
[
"Song",
"Xue",
""
],
[
"Li",
"Shuyi",
""
],
[
"Li",
"Yunxuan",
""
],
[
"Zhu",
"Yiqing",
""
]
] | A bounce universe model with a scale-invariant and stable spectrum of primordial density perturbations was constructed using a consistent truncation of the D-brane dynamics from Type IIB string theory. A coupling was introduced between the tachyon field and the adjoint Higgs field on the D3-branes to lock the tachyon a... |
0903.3731 | Djamal Dou | Djamel Dou | Comments on the Entanglement Entropy on Fuzzy Spaces | 14 pages, 2 figures | Mod.Phys.Lett.A24:2467-2480,2009 | 10.1142/S0217732309030886 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We locate the relevant degrees of freedom for the entanglement entropy on
some 2+1 fuzzy models. It is found that the entropy is stored in the near
boundary degrees of freedom. We give a simple analytical derivation for the
area law using $1/N$ like expansion when only the near boundary degrees of
freedom are incorpo... | [
{
"created": "Sun, 22 Mar 2009 15:46:30 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 2009 04:24:12 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Apr 2009 13:38:26 GMT",
"version": "v3"
},
{
"created": "Wed, 15 Apr 2009 04:08:33 GMT",
"version": "v4"
}
] | 2014-11-18 | [
[
"Dou",
"Djamel",
""
]
] | We locate the relevant degrees of freedom for the entanglement entropy on some 2+1 fuzzy models. It is found that the entropy is stored in the near boundary degrees of freedom. We give a simple analytical derivation for the area law using $1/N$ like expansion when only the near boundary degrees of freedom are incorpora... |
1802.08958 | Serhii Samokhvalov E. | S.E. Samokhvalov, V.S. Vanyashin | Group theory approach to unification of gravity with internal symmetry
gauge interactions: I. Canonical electrogravity | 7 pages | Class. Quantum Grav. 8 (1991) 2277-2282 | 10.1088/0264-9381/8/12/012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The infinite group of deformed diffeomorphisms of the spacetime continuum is
put into the basis of the gauge theory of gravity. This gives rise to some new
ways for unification of gravity with other gauge interactions.
| [
{
"created": "Sun, 25 Feb 2018 06:26:24 GMT",
"version": "v1"
}
] | 2018-03-07 | [
[
"Samokhvalov",
"S. E.",
""
],
[
"Vanyashin",
"V. S.",
""
]
] | The infinite group of deformed diffeomorphisms of the spacetime continuum is put into the basis of the gauge theory of gravity. This gives rise to some new ways for unification of gravity with other gauge interactions. |
1506.05236 | Alexei Zayats | Alexander B. Balakin, Alexei E. Zayats | Nonminimal black holes with regular electric field | 10 pages, 2 figures; based on talks presented at VII Black Holes
Workshop, Aveiro, Portugal | Int. J. Mod. Phys. D 24, 1542009 (2015) | 10.1142/S0218271815420092 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the problem of identification of coupling constants, which
describe interactions between photons and space-time curvature, using exact
regular solutions to the extended equations of the nonminimal Einstein-Maxwell
theory. We argue the idea that three nonminimal coupling constants in this
theory can be redu... | [
{
"created": "Wed, 17 Jun 2015 08:22:40 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Zayats",
"Alexei E.",
""
]
] | We discuss the problem of identification of coupling constants, which describe interactions between photons and space-time curvature, using exact regular solutions to the extended equations of the nonminimal Einstein-Maxwell theory. We argue the idea that three nonminimal coupling constants in this theory can be reduce... |
1201.3267 | Alan Cornell | W. A. Carlson, A. S. Cornell and B. Jordan | Fermion Quasi-normal modes of the Kerr Black-Hole | 13 pages, 1 figure | null | null | WITS-CTP-86 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the fermion quasi-normal modes of a 4-dimensional
rotating black-hole using the WKB(J) (to third and sixth order) and the AIM
semi-analytic methods in the massless Dirac fermion sector. These semi-analytic
approximations are computed in a pedagogical manner with comparisons made to
the numerica... | [
{
"created": "Mon, 16 Jan 2012 14:32:12 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jan 2012 12:23:58 GMT",
"version": "v2"
}
] | 2012-01-30 | [
[
"Carlson",
"W. A.",
""
],
[
"Cornell",
"A. S.",
""
],
[
"Jordan",
"B.",
""
]
] | In this paper we study the fermion quasi-normal modes of a 4-dimensional rotating black-hole using the WKB(J) (to third and sixth order) and the AIM semi-analytic methods in the massless Dirac fermion sector. These semi-analytic approximations are computed in a pedagogical manner with comparisons made to the numerical ... |
1010.3052 | Jo\~ao Paulo Pitelli Manoel | J.P.M. Pitelli and P.S. Letelier | Quantum Singularities in Static Spacetimes | 14 pages, section Quantum Singularities has been improved | Int.J.Mod.Phys.D20:729-743,2011 | 10.1142/S0218271811019062 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the mathematical framework necessary to understand the physical
content of quantum singularities in static spacetimes. We present many examples
of classical singular spacetimes and study their singularities by using wave
packets satisfying Klein-Gordon and Dirac equations. We show that in many cases
the cla... | [
{
"created": "Fri, 15 Oct 2010 00:28:41 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2011 20:03:42 GMT",
"version": "v2"
}
] | 2011-08-01 | [
[
"Pitelli",
"J. P. M.",
""
],
[
"Letelier",
"P. S.",
""
]
] | We review the mathematical framework necessary to understand the physical content of quantum singularities in static spacetimes. We present many examples of classical singular spacetimes and study their singularities by using wave packets satisfying Klein-Gordon and Dirac equations. We show that in many cases the class... |
2210.12039 | Ranchhaigiri Brahma Mr. | Ranchhaigiri Brahma and A. K. Sen | The space-time line element for static ellipsoidal objects | null | null | 10.1007/s10714-023-03078-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we solved the Einstein's field equation and obtained a line
element for static, ellipsoidal objects characterized by the linear
eccentricity ($\eta$) instead of quadrupole parameter ($q$). This line element
recovers the Schwarzschild line element when $\eta$ is zero. In addition to
that it also reduces... | [
{
"created": "Fri, 21 Oct 2022 15:30:04 GMT",
"version": "v1"
}
] | 2023-02-08 | [
[
"Brahma",
"Ranchhaigiri",
""
],
[
"Sen",
"A. K.",
""
]
] | In this paper, we solved the Einstein's field equation and obtained a line element for static, ellipsoidal objects characterized by the linear eccentricity ($\eta$) instead of quadrupole parameter ($q$). This line element recovers the Schwarzschild line element when $\eta$ is zero. In addition to that it also reduces t... |
1406.6943 | Lorenzo Reverberi | Lorenzo Reverberi | Some Observable Effects of Modified Gravity in Cosmology and
Astrophysics | Doctoral thesis successfully defended in March 2014, grade:
Excellent. Advisor: Prof. A.D. Dolgov. Part of the work done in collaboration
with E.V. Arbuzova. | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Chapter 1 I present the current picture of the universe and briefly review
the cosmological constant problem and some of the theories proposed to solve
it. The following Chapters essentially contain the published papers with some
modifications and additions: in Chapter 2 I study the radiation-dominated epoch
in $R... | [
{
"created": "Thu, 26 Jun 2014 16:54:59 GMT",
"version": "v1"
}
] | 2014-08-10 | [
[
"Reverberi",
"Lorenzo",
""
]
] | In Chapter 1 I present the current picture of the universe and briefly review the cosmological constant problem and some of the theories proposed to solve it. The following Chapters essentially contain the published papers with some modifications and additions: in Chapter 2 I study the radiation-dominated epoch in $R^2... |
2205.03889 | Phongpichit Channuie | Peeravit Koad (Walailak U.), Jatechan Channuie (Walailak U.),
Phongpichit Channuie (Walailak U.) | On preheating after inflation in general scalar-tensor theories of
gravity | v2: 16 pages, 4 figures, version accepted for publication in
Fortschritte der Physik | Fortschr. Phys. 2023, 2300041 | 10.1002/prop.202300041 | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigate the preheating mechanism after inflation in
general scalar-tensor theories of gravity. In the present scenario, we consider
two-field scenario and then derive the potential of exponential and hyperbolic
tangent forms. We study the evolution of the background system when the back
reaction ... | [
{
"created": "Sun, 8 May 2022 15:01:33 GMT",
"version": "v1"
},
{
"created": "Mon, 1 May 2023 15:33:16 GMT",
"version": "v2"
}
] | 2023-05-10 | [
[
"Koad",
"Peeravit",
"",
"Walailak U."
],
[
"Channuie",
"Jatechan",
"",
"Walailak U."
],
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
]
] | In this work, we investigate the preheating mechanism after inflation in general scalar-tensor theories of gravity. In the present scenario, we consider two-field scenario and then derive the potential of exponential and hyperbolic tangent forms. We study the evolution of the background system when the back reaction on... |
gr-qc/9903055 | Frans Pretorius | Frans Pretorius | Quantum interest for scalar fields in Minkowski spacetime | 14 pages, 5 figures; several references added, a few minor changes
and a typo in Figure 3 corrected | Phys.Rev. D61 (2000) 064005 | 10.1103/PhysRevD.61.064005 | null | gr-qc | null | The quantum interest conjecture of Ford and Roman states that any negative
energy flux in a free quantum field must be preceded or followed by a positive
flux of greater magnitude, and the surplus of positive energy grows the further
the positive and negative fluxes are apart. In addition, the maximum possible
separa... | [
{
"created": "Mon, 15 Mar 1999 01:17:45 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Dec 1999 08:48:44 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Pretorius",
"Frans",
""
]
] | The quantum interest conjecture of Ford and Roman states that any negative energy flux in a free quantum field must be preceded or followed by a positive flux of greater magnitude, and the surplus of positive energy grows the further the positive and negative fluxes are apart. In addition, the maximum possible separati... |
2108.07451 | Michael Good | Michael R.R. Good and Eric V. Linder | M\"obius Mirrors | 10 pages, 4 figures, appendix | Classical and Quantum Gravity (2022) | 10.1088/1361-6382/ac60c3 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | An accelerating boundary (mirror) acts as a horizon and black hole analog,
radiating energy with some particle spectrum. We demonstrate that a M\"obius
transformation on the null coordinate advanced time mirror trajectory uniquely
keeps invariant not only the energy flux but the particle spectrum. We clarify
how the ... | [
{
"created": "Tue, 17 Aug 2021 05:33:15 GMT",
"version": "v1"
}
] | 2022-03-28 | [
[
"Good",
"Michael R. R.",
""
],
[
"Linder",
"Eric V.",
""
]
] | An accelerating boundary (mirror) acts as a horizon and black hole analog, radiating energy with some particle spectrum. We demonstrate that a M\"obius transformation on the null coordinate advanced time mirror trajectory uniquely keeps invariant not only the energy flux but the particle spectrum. We clarify how the ge... |
2109.14641 | Lu\'is Filipe Costa | L. Filipe O. Costa, Jos\'e Nat\'ario | Frame-dragging: meaning, myths, and misconceptions | 20+8 pages, 4 figures. Invited feature paper for Universe special
issue on "Frame-Dragging and Gravitomagnetism"; matches the final published
version | Universe 7(10), 388 (2021) | 10.3390/universe7100388 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Originally introduced in connection with general relativistic Coriolis
forces, the term $\textit{frame-dragging}$ is associated today with a plethora
of effects related to the off-diagonal element of the metric tensor. It is also
frequently the subject of misconceptions leading to incorrect predictions, even
of nonex... | [
{
"created": "Wed, 29 Sep 2021 18:00:32 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Nov 2021 19:00:07 GMT",
"version": "v2"
}
] | 2021-11-30 | [
[
"Costa",
"L. Filipe O.",
""
],
[
"Natário",
"José",
""
]
] | Originally introduced in connection with general relativistic Coriolis forces, the term $\textit{frame-dragging}$ is associated today with a plethora of effects related to the off-diagonal element of the metric tensor. It is also frequently the subject of misconceptions leading to incorrect predictions, even of nonexis... |
2106.15635 | Sebastian Steinhaus | Jos\'e Diogo Sim\~ao and Sebastian Steinhaus | Asymptotic analysis of spin-foams with time-like faces in a new
parameterisation | 33 pages + 17 pages appendices, 4 figures, v2: minor update on cosine
problem, v3: removed wrong claim on cosine problem, v4: matching version
accepted for publication, updated discussion on completion of asymtotic
analysis | Phys. Rev. D 104, 126001 2021 | 10.1103/PhysRevD.104.126001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we study the Conrady-Hnybida extension of the Lorentzian
Engle-Pereira-Rovelli-Livine spin-foam model, which admits time-like cells
rather than just space-like ones. Our focus is on the asymptotic analysis of
the model's vertex amplitude.
We propose a new parametrization for states associated to tim... | [
{
"created": "Tue, 29 Jun 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2021 12:42:59 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Sep 2021 15:53:04 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Oct 2021 14:06:19 GMT",
"version": "v4"
}
] | 2021-12-02 | [
[
"Simão",
"José Diogo",
""
],
[
"Steinhaus",
"Sebastian",
""
]
] | In this article we study the Conrady-Hnybida extension of the Lorentzian Engle-Pereira-Rovelli-Livine spin-foam model, which admits time-like cells rather than just space-like ones. Our focus is on the asymptotic analysis of the model's vertex amplitude. We propose a new parametrization for states associated to time-li... |
1410.2334 | Michael Edmund Tobar | Maxim Goryachev and Michael E. Tobar | Gravitational Wave Detection with High Frequency Phonon Trapping
Acoustic Cavities | Three Errors have been fixed, an errata will appear in PRD. These
errors mean that modes of n = 1,3 are more sensitive than the paper
originally indicated, and modes of n = 5,7 are of similar sensitivity as
indicated in the paper. All other higher-order modes are significantly less
sensitive than originally ind... | Phys. Rev. D 90, 102005 (2014) | 10.1103/PhysRevD.90.102005 | null | gr-qc physics.ins-det quant-ph | http://creativecommons.org/licenses/by/4.0/ | There are a number of theoretical predictions for astrophysical and
cosmological objects, which emit high frequency ($10^6-10^9$~Hz) Gravitation
Waves (GW) or contribute somehow to the stochastic high frequency GW
background. Here we propose a new sensitive detector in this frequency band,
which is based on existing ... | [
{
"created": "Thu, 9 Oct 2014 02:24:11 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Oct 2014 03:31:06 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Nov 2023 06:51:45 GMT",
"version": "v3"
}
] | 2023-11-16 | [
[
"Goryachev",
"Maxim",
""
],
[
"Tobar",
"Michael E.",
""
]
] | There are a number of theoretical predictions for astrophysical and cosmological objects, which emit high frequency ($10^6-10^9$~Hz) Gravitation Waves (GW) or contribute somehow to the stochastic high frequency GW background. Here we propose a new sensitive detector in this frequency band, which is based on existing cr... |
2103.02274 | Saikat Chakraborty | Saikat Chakraborty, Kelly MacDevette, Peter Dunsby | A model independent approach to the study of $f(R)$ cosmologies with
expansion histories close to $\Lambda$CDM | 11 pages, 4 figures, figures improved, conclusion section modified | Phys. Rev. D 103, 124040 (2021) | 10.1103/PhysRevD.103.124040 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We propose a new framework for studying the cosmology of $f(R)$ gravity which
completely avoids using the reconstruction programme. This allows us to easily
obtain a qualitative feel of how much the $\Lambda$CDM model differs from other
$f(R)$ theories of gravity at the level of linear perturbation theory for
theorie... | [
{
"created": "Wed, 3 Mar 2021 09:20:06 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Mar 2021 08:39:02 GMT",
"version": "v2"
},
{
"created": "Wed, 19 May 2021 15:20:14 GMT",
"version": "v3"
}
] | 2021-06-22 | [
[
"Chakraborty",
"Saikat",
""
],
[
"MacDevette",
"Kelly",
""
],
[
"Dunsby",
"Peter",
""
]
] | We propose a new framework for studying the cosmology of $f(R)$ gravity which completely avoids using the reconstruction programme. This allows us to easily obtain a qualitative feel of how much the $\Lambda$CDM model differs from other $f(R)$ theories of gravity at the level of linear perturbation theory for theories ... |
gr-qc/0008076 | Jose' P. S. Lemos | Dmitri V. Gal'tsov and Jose' P. S. Lemos | No-go theorem for false vacuum black holes | 16 pages, 1 figure, Latex, some references added, to appear in
Classical and Quantum Gravity | Class.Quant.Grav. 18 (2001) 1715-1726 | 10.1088/0264-9381/18/9/308 | DTP--MSU/00-14 ; DF/IST-5.2000 | gr-qc | null | We study the possibility of non-singular black hole solutions in the theory
of general relativity coupled to a non-linear scalar field with a positive
potential possessing two minima: a `false vacuum' with positive energy and a
`true vacuum' with zero energy. Assuming that the scalar field starts at the
false vacuum ... | [
{
"created": "Thu, 31 Aug 2000 15:06:36 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Mar 2001 18:04:49 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gal'tsov",
"Dmitri V.",
""
],
[
"Lemos",
"Jose' P. S.",
""
]
] | We study the possibility of non-singular black hole solutions in the theory of general relativity coupled to a non-linear scalar field with a positive potential possessing two minima: a `false vacuum' with positive energy and a `true vacuum' with zero energy. Assuming that the scalar field starts at the false vacuum at... |
0902.1277 | Plamen Fiziev | P. P. Fiziev | Classes of Exact Solutions to Regge-Wheeler and Teukolsky Equations | 25 pages, no figures, the original Teukolsky's conventions restored,
new sections, commnents, formulas, notations, references; typos corrected | null | null | SU-TH-02-09-1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Regge-Wheeler equation describes axial perturbations of Schwarzschild
metric in linear approximation. Teukolsky Master Equation describes
perturbations of Kerr metric in the same approximation. We present here unified
description of all classes of exact solutions to these equations in terms of
the confluent Heun'... | [
{
"created": "Sun, 8 Feb 2009 10:47:12 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Feb 2009 16:55:24 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Mar 2009 13:32:17 GMT",
"version": "v3"
}
] | 2009-03-17 | [
[
"Fiziev",
"P. P.",
""
]
] | The Regge-Wheeler equation describes axial perturbations of Schwarzschild metric in linear approximation. Teukolsky Master Equation describes perturbations of Kerr metric in the same approximation. We present here unified description of all classes of exact solutions to these equations in terms of the confluent Heun's ... |
2009.00291 | Zhen-Ming Xu | Zhen-Ming Xu, Bin Wu, and Wen-Li Yang | Thermodynamics curvature in phase transitions for AdS black hole | v1: 6 pages, 1 figure; v2: title slightly changed; v3: clarifications
added; v4: match published version | Physics Letters B 821 (2021) 136632 | 10.1016/j.physletb.2021.136632 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the thermodynamic curvature in the Hawking-Page phase
transition and the second-order phase transition of the AdS black hole. It is
shown that the thermodynamic curvature has the same behavior in these two
different phase transitions. Specifically, the thermodynamic curvature in the
Hawking-Page phase ... | [
{
"created": "Tue, 1 Sep 2020 08:43:43 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Sep 2020 08:23:31 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Nov 2020 02:51:46 GMT",
"version": "v3"
},
{
"created": "Thu, 30 Sep 2021 03:10:37 GMT",
"version": "v4"
}
] | 2021-10-01 | [
[
"Xu",
"Zhen-Ming",
""
],
[
"Wu",
"Bin",
""
],
[
"Yang",
"Wen-Li",
""
]
] | We investigate the thermodynamic curvature in the Hawking-Page phase transition and the second-order phase transition of the AdS black hole. It is shown that the thermodynamic curvature has the same behavior in these two different phase transitions. Specifically, the thermodynamic curvature in the Hawking-Page phase tr... |
1012.5252 | Chih-Hung Wang | Chih-Hung Wang, Hing-Tong Cho, Yu-Huei Wu | Domain wall space-times with a cosmological constant | 9 pages. no figure | Phys.Rev.D83:084014,2011 | 10.1103/PhysRevD.83.084014 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We solve vacuum Einstein's field equations with the cosmological constant in
space-times admitting 3-parameter group of isometries with 2-dimensional
space-like orbits. The general exact solutions, which are represented in the
advanced and retarded null coordinates, have two arbitrary functions due to the
freedom of ... | [
{
"created": "Thu, 23 Dec 2010 17:09:37 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2011 15:46:57 GMT",
"version": "v2"
}
] | 2011-04-22 | [
[
"Wang",
"Chih-Hung",
""
],
[
"Cho",
"Hing-Tong",
""
],
[
"Wu",
"Yu-Huei",
""
]
] | We solve vacuum Einstein's field equations with the cosmological constant in space-times admitting 3-parameter group of isometries with 2-dimensional space-like orbits. The general exact solutions, which are represented in the advanced and retarded null coordinates, have two arbitrary functions due to the freedom of ch... |
2109.11376 | Santiago Jaraba | Juan Garc\'ia-Bellido, Santiago Jaraba, Sachiko Kuroyanagi | The stochastic gravitational wave background from close hyperbolic
encounters of primordial black holes in dense clusters | 7 pages, 1 figure. Changes match published version | Physics of the Dark Universe 36 (2022), 101009 | 10.1016/j.dark.2022.101009 | IFT-UAM/CSIC-21-102 | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The inner part of dense clusters of primordial black holes is an active
environment where multiple scattering processes take place. Some of them give
rise from time to time to bounded pairs, and the rest ends up with a single
scattering event. The former eventually evolves to a binary black hole (BBH)
emitting period... | [
{
"created": "Thu, 23 Sep 2021 13:46:04 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 08:07:47 GMT",
"version": "v2"
}
] | 2022-04-19 | [
[
"García-Bellido",
"Juan",
""
],
[
"Jaraba",
"Santiago",
""
],
[
"Kuroyanagi",
"Sachiko",
""
]
] | The inner part of dense clusters of primordial black holes is an active environment where multiple scattering processes take place. Some of them give rise from time to time to bounded pairs, and the rest ends up with a single scattering event. The former eventually evolves to a binary black hole (BBH) emitting periodic... |
0705.1572 | Duncan Brown | Duncan A. Brown, Stanislav Babak, Patrick R. Brady, Nelson
Christensen, Thomas Cokelaer, Jolien D. E. Creighton, Stephen Fairhurst,
Gabriela Gonzalez, Eirini Messaritaki, B. S. Sathyaprakash, Peter Shawhan,
Natalia Zotov | Searching for Gravitational Waves from Binary Inspirals with LIGO | 9 pages, 2 figures. Published in proceedings of the 8th Gravitational
Wave Data Analysis Workshop, Milwaukee, WI, USA, 17-20 December 2003 | Class.Quant.Grav.21:S1625-S1633,2004 | 10.1088/0264-9381/21/20/005 | null | gr-qc | null | We describe the current status of the search for gravitational waves from
inspiralling compact binary systems in LIGO data. We review the result from the
first scientific run of LIGO (S1). We present the goals of the search of data
taken in the second scientific run (S2) and describe the differences between
the metho... | [
{
"created": "Fri, 11 May 2007 01:25:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Brown",
"Duncan A.",
""
],
[
"Babak",
"Stanislav",
""
],
[
"Brady",
"Patrick R.",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Cokelaer",
"Thomas",
""
],
[
"Creighton",
"Jolien D. E.",
""
],
[
"Fairhurst",
"Steph... | We describe the current status of the search for gravitational waves from inspiralling compact binary systems in LIGO data. We review the result from the first scientific run of LIGO (S1). We present the goals of the search of data taken in the second scientific run (S2) and describe the differences between the methods... |
gr-qc/0104031 | Tiberiu Harko | M. K. Mak, Peter N. Dobson, Jr. and T. Harko | Maximum Mass-Radius Ratio for Compact General Relativistic Objects in
Schwarzschild- de Sitter Geometry | 8 pages, no figures | Mod.Phys.Lett. A15 (2000) 2153-2158 | 10.1142/S0217732300002723 | null | gr-qc | null | Upper limits for the mass-radius ratio are derived for arbitrary general
relativistic matter distributions in the presence of a cosmological constant.
General restrictions for the red shift and total energy (including the
gravitational contribution) for compact objects in the Schwarzschild-de Sitter
geometry are also... | [
{
"created": "Thu, 12 Apr 2001 01:57:52 GMT",
"version": "v1"
}
] | 2012-08-27 | [
[
"Mak",
"M. K.",
""
],
[
"Dobson,",
"Peter N.",
"Jr."
],
[
"Harko",
"T.",
""
]
] | Upper limits for the mass-radius ratio are derived for arbitrary general relativistic matter distributions in the presence of a cosmological constant. General restrictions for the red shift and total energy (including the gravitational contribution) for compact objects in the Schwarzschild-de Sitter geometry are also o... |
gr-qc/0001091 | Michael T. Anderson | Michael T. Anderson (SUNY Stony Brook) | On stationary vacuum solutions to the Einstein equations | 14 pages, Final version, to appear in Annales Henri Poincare | Annales Henri Poincare 1 (2000) 977 | 10.1007/PL00001021 | null | gr-qc math.DG | null | It is proved that the only geodesically complete stationary vacuum solution
of the Einstein equations is the empty Minkowski space, or a quotient of it by
a discrete group of isometries, generalizing a classical result of
Lichnerowicz. In addition, we obtain an apriori bound on the curvature of
stationary vacuum solu... | [
{
"created": "Thu, 27 Jan 2000 18:22:28 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jan 2000 02:35:51 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jun 2000 18:10:42 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Anderson",
"Michael T.",
"",
"SUNY Stony Brook"
]
] | It is proved that the only geodesically complete stationary vacuum solution of the Einstein equations is the empty Minkowski space, or a quotient of it by a discrete group of isometries, generalizing a classical result of Lichnerowicz. In addition, we obtain an apriori bound on the curvature of stationary vacuum soluti... |
gr-qc/0312061 | Carlo Ungarelli Dr | Carlo Ungarelli and Alberto Vecchio | A family of filters to search for frequency dependent gravitational wave
stochastic backgrounds | 4 pages, 4 figures, uses iopart.cls, accepted for publications on
Classical and Quantum Gravity (Special Issue, Proceedings of Amaldi 2003) | Class.Quant.Grav. 21 (2004) S857-S860 | 10.1088/0264-9381/21/5/072 | null | gr-qc | null | We consider a three dimensional family of filters based on broken power law
spectra to search for gravitational wave stochastic backgrounds in the data
from Earth-based laser interferometers. We show that such templates produce the
necessary fitting factor for a wide class of cosmological backgrounds and
astrophysica... | [
{
"created": "Wed, 10 Dec 2003 17:54:29 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ungarelli",
"Carlo",
""
],
[
"Vecchio",
"Alberto",
""
]
] | We consider a three dimensional family of filters based on broken power law spectra to search for gravitational wave stochastic backgrounds in the data from Earth-based laser interferometers. We show that such templates produce the necessary fitting factor for a wide class of cosmological backgrounds and astrophysical ... |
2204.00876 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou, R. Myrzakulov | Spectrum of Primordial Gravitational Waves in Modified Gravities: A
Short Overview | Invited review, Symmetry accepted | Symmetry 14 (2022) 729 | 10.3390/sym14040729 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we shall exhaustively study the effects of modified gravity on
the energy spectrum of the primordial gravitational waves background. S.
Weinberg has also produced significant works related to the primordial
gravitational waves with the most important one being the effects of neutrinos
on primordial gravi... | [
{
"created": "Sat, 2 Apr 2022 14:52:04 GMT",
"version": "v1"
}
] | 2022-04-07 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | In this work we shall exhaustively study the effects of modified gravity on the energy spectrum of the primordial gravitational waves background. S. Weinberg has also produced significant works related to the primordial gravitational waves with the most important one being the effects of neutrinos on primordial gravita... |
1902.07611 | Sebastian V\"olkel | Sebastian H. V\"olkel, Roman Konoplya and Kostas D. Kokkotas | The Inverse Problem for Hawking Radiation | null | Phys. Rev. D 99, 104025 (2019) | 10.1103/PhysRevD.99.104025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the inverse problem related to the emission of Hawking
radiation. We first show how the knowledge of greybody factors of different
angular contributions $l$ can be used to constrain the width of the
corresponding black hole perturbation potentials. Afterwards we provide a
framework to recover th... | [
{
"created": "Wed, 20 Feb 2019 15:54:41 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Völkel",
"Sebastian H.",
""
],
[
"Konoplya",
"Roman",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | In this work we study the inverse problem related to the emission of Hawking radiation. We first show how the knowledge of greybody factors of different angular contributions $l$ can be used to constrain the width of the corresponding black hole perturbation potentials. Afterwards we provide a framework to recover the ... |
1909.13252 | Qing-Hua Zhu | Zhe Chang and Qing-Hua Zhu | Reference frame dependence of the local measurement of the Hubble
constant | v1: 12 pages; v2: 19 pages, 2 figures. A revised version for
publishing in PRD | Phys. Rev. D 101, 103530 (2020) | 10.1103/PhysRevD.101.103530 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations recently suggest $4.4\sigma$ discrepancy between Hubble constant
measured locally and that inferred from cosmic microwave background in standard
cosmology. Either standard cosmology or local measurement might expect
something new. We investigate the possibility that the value of Hubble
constants might be... | [
{
"created": "Sun, 29 Sep 2019 10:35:44 GMT",
"version": "v1"
},
{
"created": "Fri, 29 May 2020 02:42:22 GMT",
"version": "v2"
}
] | 2020-06-01 | [
[
"Chang",
"Zhe",
""
],
[
"Zhu",
"Qing-Hua",
""
]
] | Observations recently suggest $4.4\sigma$ discrepancy between Hubble constant measured locally and that inferred from cosmic microwave background in standard cosmology. Either standard cosmology or local measurement might expect something new. We investigate the possibility that the value of Hubble constants might be a... |
2203.14336 | German Sharov | German S. Sharov and Vasily E. Myachin | Modified Equations of State for Dark Energy and Observational
Limitations | 16 pages, 5 figures | Universe 2022, 8(4), 201 | 10.3390/universe8040201 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Cosmological models with variable and modified equations of state for dark
energy are confronted with observational data, including Type Ia supernovae,
Hubble parameter data $H(z)$ from different sources, and observational
manifestations of cosmic microwave background radiation (CMB). We consider
scenarios generalizi... | [
{
"created": "Sun, 27 Mar 2022 15:51:08 GMT",
"version": "v1"
}
] | 2022-03-29 | [
[
"Sharov",
"German S.",
""
],
[
"Myachin",
"Vasily E.",
""
]
] | Cosmological models with variable and modified equations of state for dark energy are confronted with observational data, including Type Ia supernovae, Hubble parameter data $H(z)$ from different sources, and observational manifestations of cosmic microwave background radiation (CMB). We consider scenarios generalizing... |
gr-qc/9910023 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | On the Salecker-Wigner limit and the use of interferometers in
space-time-foam studies | LaTex, 18 pages | Phys.Lett. B477 (2000) 436-450 | 10.1016/S0370-2693(00)00231-8 | CERN-TH/99-303 | gr-qc hep-ph | null | The recent paper gr-qc/9909017 criticizes the limit on the measurability of
distances that was derived by Salecker and Wigner in the 1950s. If justified,
this criticism would have important implications for all the recent studies
that have used in various ways the celebrated Salecker-Wigner result, but I
show here th... | [
{
"created": "Wed, 6 Oct 1999 20:11:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | The recent paper gr-qc/9909017 criticizes the limit on the measurability of distances that was derived by Salecker and Wigner in the 1950s. If justified, this criticism would have important implications for all the recent studies that have used in various ways the celebrated Salecker-Wigner result, but I show here that... |
1803.07493 | Selman Ipek | Selman Ipek, Mohammad Abedi, and Ariel Caticha | Entropic Dynamics: Reconstructing Quantum Field Theory in Curved
Space-time | V2 contains added comments on reconstructing QFT, on QFT divergences,
various improvements in style, and corrects some typos. V3 contains new
section containing applications, including a derivation of the Ehrenfest
relations for a quantum scalar field in curved space-time | null | 10.1088/1361-6382/ab436c | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Entropic Dynamics reconstruction of quantum mechanics is extended to
quantum field theory in curved space-time. The Entropic Dynamics framework,
which derives quantum theory as an application of the method of maximum
entropy, is combined with the covariant methods of Dirac, Hojman, Kucha\v{r},
and Teitelboim, whi... | [
{
"created": "Tue, 20 Mar 2018 15:43:51 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Dec 2018 16:39:55 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Aug 2019 20:54:28 GMT",
"version": "v3"
}
] | 2020-01-08 | [
[
"Ipek",
"Selman",
""
],
[
"Abedi",
"Mohammad",
""
],
[
"Caticha",
"Ariel",
""
]
] | The Entropic Dynamics reconstruction of quantum mechanics is extended to quantum field theory in curved space-time. The Entropic Dynamics framework, which derives quantum theory as an application of the method of maximum entropy, is combined with the covariant methods of Dirac, Hojman, Kucha\v{r}, and Teitelboim, which... |
1611.09290 | Ricardo Antonio Mosna | Ricardo A. Mosna, J. P. M. Pitelli, and Maur\'icio Richartz | Analogue model for anti-de Sitter as a description of point sources in
fluids | 6 pages, 1 figure. To appear in Phys Rev D | Phys. Rev. D 94, 104065 (2016) | 10.1103/PhysRevD.94.104065 | null | gr-qc math-ph math.MP physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an analogue model for a nonglobally hyperbolic spacetime in
terms of a two-dimensional fluid. This is done by considering the propagation
of sound waves in a radial flow with constant velocity. We show that the
equation of motion satisfied by sound waves is the wave equation on
$AdS_2\times S^1$. Since t... | [
{
"created": "Mon, 28 Nov 2016 19:14:04 GMT",
"version": "v1"
}
] | 2016-12-06 | [
[
"Mosna",
"Ricardo A.",
""
],
[
"Pitelli",
"J. P. M.",
""
],
[
"Richartz",
"Maurício",
""
]
] | We introduce an analogue model for a nonglobally hyperbolic spacetime in terms of a two-dimensional fluid. This is done by considering the propagation of sound waves in a radial flow with constant velocity. We show that the equation of motion satisfied by sound waves is the wave equation on $AdS_2\times S^1$. Since thi... |
1912.00378 | Hayato Motohashi | Hayato Motohashi, Shinji Mukohyama | Weakly-coupled stealth solution in scordatura degenerate theory | 16 pages; matches published version | JCAP 01 (2020) 030 | 10.1088/1475-7516/2020/01/030 | YITP-19-98, IPMU19-0156 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In scalar-tensor theories we revisit the issue of strong coupling of
perturbations around stealth solutions, i.e.\ backgrounds with the same forms
of the metric as in General Relativity but with non-trivial configurations of
the scalar field. The simplest among them is a stealth Minkowski (or de Sitter)
solution with... | [
{
"created": "Sun, 1 Dec 2019 10:31:33 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Feb 2020 04:22:54 GMT",
"version": "v2"
}
] | 2020-02-25 | [
[
"Motohashi",
"Hayato",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | In scalar-tensor theories we revisit the issue of strong coupling of perturbations around stealth solutions, i.e.\ backgrounds with the same forms of the metric as in General Relativity but with non-trivial configurations of the scalar field. The simplest among them is a stealth Minkowski (or de Sitter) solution with a... |
0810.2554 | Leszek Soko{\l}owski | Leszek M. Sokolowski | Stability of a metric f(R) gravity theory implies the Newtonian limit | 22 pages | Acta Phys.Polon.B39:2879-2901,2008 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the existence of the Newtonian limit cannot work as a selection
rule for choosing the correct gravity theory fromm the set of all L=f(R) ones.
To this end we prove that stability of the ground state solution in arbitrary
purely metric f(R) gravity implies the existence of the Newtonian limit of the
theor... | [
{
"created": "Tue, 14 Oct 2008 20:22:14 GMT",
"version": "v1"
}
] | 2008-12-19 | [
[
"Sokolowski",
"Leszek M.",
""
]
] | We show that the existence of the Newtonian limit cannot work as a selection rule for choosing the correct gravity theory fromm the set of all L=f(R) ones. To this end we prove that stability of the ground state solution in arbitrary purely metric f(R) gravity implies the existence of the Newtonian limit of the theory.... |
1910.08370 | Christian J. Kr\"uger | C. J. Kr\"uger, K. D. Kokkotas | Fast Rotating Relativistic Stars: Spectra and Stability without
Approximation | 4 pages, 4 figures | Phys. Rev. Lett. 125, 111106 (2020) | 10.1103/PhysRevLett.125.111106 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study oscillations and instabilities of relativistic stars using
perturbation theory in general relativity and take into account the
contribution of a dynamic spacetime. We present the oscillation spectrum as
well as the critical values for the onset of the secular CFS instability of
neutron stars, and propose uni... | [
{
"created": "Fri, 18 Oct 2019 12:25:17 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2020 13:32:11 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Sep 2020 10:44:12 GMT",
"version": "v3"
}
] | 2020-09-16 | [
[
"Krüger",
"C. J.",
""
],
[
"Kokkotas",
"K. D.",
""
]
] | We study oscillations and instabilities of relativistic stars using perturbation theory in general relativity and take into account the contribution of a dynamic spacetime. We present the oscillation spectrum as well as the critical values for the onset of the secular CFS instability of neutron stars, and propose unive... |
gr-qc/0305064 | Ujjal Debnath | Subenoy Chakraborty, N. C. Chakraborty and Ujjal Debnath | Brans-Dicke Cosmology in an anisotropic model when Velocity of Light
Varies | 11 Latex pages, Two figures, Revtex style | Int.J.Mod.Phys. D11 (2002) 921-932 | 10.1142/S0218271802002013 | null | gr-qc | null | In this paper, we have studied Brans-Dicke Cosmology in anisotropic
Kantowski-Sachs space-time model; considering variation of the velocity of
light. We have addressed the flatness problem considering both the cases
namely, (i) when the Brans-Dicke scale field $\phi$ is constant (ii) when
$\phi$ varies, specially for... | [
{
"created": "Fri, 16 May 2003 15:30:35 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Chakraborty",
"N. C.",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this paper, we have studied Brans-Dicke Cosmology in anisotropic Kantowski-Sachs space-time model; considering variation of the velocity of light. We have addressed the flatness problem considering both the cases namely, (i) when the Brans-Dicke scale field $\phi$ is constant (ii) when $\phi$ varies, specially for r... |
gr-qc/9602052 | Eanna Flanagan | Eanna Flanagan and Robert Wald | Does backreaction enforce the averaged null energy condition in
semiclassical gravity? | 54 pages, 3 figures, uses revtex macros and epsf.tex, to appear in
Phys Rev D. A new appendix has been added showing consistency of our results
with recent results of Visser [gr-qc/9604008]. Some corrections were made to
Appendix A, and several other minor changes to the body of the paper also
were made | Phys.Rev.D54:6233-6283,1996 | 10.1103/PhysRevD.54.6233 | EFI-96-08 | gr-qc hep-th | null | The expected stress-energy tensor <T_{ab}> of quantum fields generically
violates the local positive energy conditions of general relativity. However,
<T_{ab}> may satisfy some nonlocal conditions such as the averaged null energy
condition (ANEC), which would rule out traversable wormholes. Although ANEC
holds in Min... | [
{
"created": "Tue, 27 Feb 1996 02:04:06 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jul 1996 06:42:07 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Flanagan",
"Eanna",
""
],
[
"Wald",
"Robert",
""
]
] | The expected stress-energy tensor <T_{ab}> of quantum fields generically violates the local positive energy conditions of general relativity. However, <T_{ab}> may satisfy some nonlocal conditions such as the averaged null energy condition (ANEC), which would rule out traversable wormholes. Although ANEC holds in Minko... |
1201.3304 | Peter Hogan | C. Barrab\`es and P. A. Hogan | Collisions of Shock Waves in General Relativity | Latex file, 10 pages | Progress of Theoretical Physics, vol.126 (2011), 1157-1165 | 10.1143/PTP.126.1157 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Nariai-Bertotti Petrov type D, homogeneous solution of
Einstein's vacuum field equations with a cosmological constant describes the
space-time in the interaction region following the head-on collision of two
homogeneous, plane gravitational shock waves each initially traveling in a
vacuum containing ... | [
{
"created": "Mon, 16 Jan 2012 16:15:45 GMT",
"version": "v1"
}
] | 2017-03-15 | [
[
"Barrabès",
"C.",
""
],
[
"Hogan",
"P. A.",
""
]
] | We show that the Nariai-Bertotti Petrov type D, homogeneous solution of Einstein's vacuum field equations with a cosmological constant describes the space-time in the interaction region following the head-on collision of two homogeneous, plane gravitational shock waves each initially traveling in a vacuum containing no... |
1511.08801 | Paul Frampton | Paul H. Frampton | The Primordial Black Hole Mass Range | 12 pages LaTeX | null | 10.1142/S0217732316500644 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate Primoridal Black Hole (PBH) formation by which we mean black
holes produced in the early universe during radiation domination. After
discussing the range of PBH mass permitted in the original mechanism of Carr
and Hawking, hybrid inflation with parametric resonance is presented as an
existence theorem ... | [
{
"created": "Fri, 27 Nov 2015 09:59:19 GMT",
"version": "v1"
}
] | 2016-04-27 | [
[
"Frampton",
"Paul H.",
""
]
] | We investigate Primoridal Black Hole (PBH) formation by which we mean black holes produced in the early universe during radiation domination. After discussing the range of PBH mass permitted in the original mechanism of Carr and Hawking, hybrid inflation with parametric resonance is presented as an existence theorem fo... |
gr-qc/9803089 | Hideo Kodama | Hideo Kodama(YITP, Kyoto University) | Summary report of the workshop D2: Conceptual Issues, Foundational
Questions and Quantum Cosmology | 7 pages, plain LaTeX, to be published in the Proceedings of GR15 | null | null | null | gr-qc | null | This is a summary report of the workshop D2 in GR15. In this workshop rather
diverging problems related to quantum gravity and quantum cosmology were
discussed. Since it is almost impossible to summarize all these discussions in
coherent and integrated expressions, in this report, I give a brief description
of the co... | [
{
"created": "Fri, 27 Mar 1998 06:34:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kodama",
"Hideo",
"",
"YITP, Kyoto University"
]
] | This is a summary report of the workshop D2 in GR15. In this workshop rather diverging problems related to quantum gravity and quantum cosmology were discussed. Since it is almost impossible to summarize all these discussions in coherent and integrated expressions, in this report, I give a brief description of the cont... |
gr-qc/0703120 | Arkady A. Popov | Arkady A. Popov, Oleg B. Zaslavskii | Quantum-corrected ultraextremal horizons and validity of WKB in massless
limit | revtex4, 9 pages | Phys.Rev.D75:084018,2007 | 10.1103/PhysRevD.75.084018 | null | gr-qc hep-th | null | We consider quantum backreaction of the quantized scalar field with an
arbitrary mass and curvature coupling on ultraextremal horizons. The problem is
distinguished in that (in contrast to non-extremal or extremal black holes) the
WKB approximation remains valid near $r_{+}$ (which is the radius of the
horizon) even ... | [
{
"created": "Sun, 25 Mar 2007 18:36:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Popov",
"Arkady A.",
""
],
[
"Zaslavskii",
"Oleg B.",
""
]
] | We consider quantum backreaction of the quantized scalar field with an arbitrary mass and curvature coupling on ultraextremal horizons. The problem is distinguished in that (in contrast to non-extremal or extremal black holes) the WKB approximation remains valid near $r_{+}$ (which is the radius of the horizon) even in... |
2203.08502 | Noa Zilberman | Noa Zilberman, Marc Casals, Amos Ori and Adrian C. Ottewill | Quantum fluxes at the inner horizon of a spinning black hole | v2: Version accepted for publication in Phys. Rev. Lett. Some
extensions; fixed typo in Eq. (7) | null | 10.1103/PhysRevLett.129.261102 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Rotating or charged classical black holes in isolation possess a special
surface in their interior, the Cauchy horizon, beyond which the evolution of
spacetime (based on the equations of General Relativity) ceases to be
deterministic. In this work, we study the effect of a quantum massless scalar
field on the Cauchy ... | [
{
"created": "Wed, 16 Mar 2022 09:56:01 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2022 11:11:08 GMT",
"version": "v2"
}
] | 2023-01-04 | [
[
"Zilberman",
"Noa",
""
],
[
"Casals",
"Marc",
""
],
[
"Ori",
"Amos",
""
],
[
"Ottewill",
"Adrian C.",
""
]
] | Rotating or charged classical black holes in isolation possess a special surface in their interior, the Cauchy horizon, beyond which the evolution of spacetime (based on the equations of General Relativity) ceases to be deterministic. In this work, we study the effect of a quantum massless scalar field on the Cauchy ho... |
2202.07819 | Krsna Dev | Krsna Dev | Exact solutions for charged spheres and their stability. I. Perfect
Fluids | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study exact solutions of the Einstein-Maxwell equations for the interior
gravitational field of static spherically symmetric charged compact spheres.
The spheres are composed of a perfect fluid with a charge distribution that
creates a static radial electric field. The inertial mass density of the fluid
has the fo... | [
{
"created": "Wed, 16 Feb 2022 01:49:46 GMT",
"version": "v1"
}
] | 2022-02-17 | [
[
"Dev",
"Krsna",
""
]
] | We study exact solutions of the Einstein-Maxwell equations for the interior gravitational field of static spherically symmetric charged compact spheres. The spheres are composed of a perfect fluid with a charge distribution that creates a static radial electric field. The inertial mass density of the fluid has the form... |
gr-qc/0512133 | Christian Klein | C. Klein | Harrison transformation of hyperelliptic solutions and charged dust
disks | 20 pages, 9 figures | Phys.Rev. D65 (2002) 084029 | 10.1103/PhysRevD.65.084029 | null | gr-qc | null | We use a Harrison transformation on solutions to the stationary axisymmetric
Einstein equations to generate solutions of the Einstein-Maxwell equations. The
case of hyperelliptic solutions to the Ernst equation is studied in detail.
Analytic expressions for the metric and the multipole moments are obtained. As
an exa... | [
{
"created": "Thu, 22 Dec 2005 13:38:56 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Klein",
"C.",
""
]
] | We use a Harrison transformation on solutions to the stationary axisymmetric Einstein equations to generate solutions of the Einstein-Maxwell equations. The case of hyperelliptic solutions to the Ernst equation is studied in detail. Analytic expressions for the metric and the multipole moments are obtained. As an examp... |
1503.08794 | Jakub Mielczarek Ph.D. | Jakub Mielczarek | From Causal Dynamical Triangulations To Astronomical Observations | 6 pages, 2 figures, matches version published in EPL | EPL 119 (2017) no.6, 60003 | 10.1209/0295-5075/119/60003 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This letter discusses phenomenological aspects of dimensional reduction
predicted by the Causal Dynamical Triangulations (CDT) approach to quantum
gravity. The deformed form of the dispersion relation for the fields defined on
the CDT space-time is reconstructed. Using the Fermi satellite observations of
the GRB 0905... | [
{
"created": "Mon, 30 Mar 2015 18:59:29 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2018 14:55:06 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Mielczarek",
"Jakub",
""
]
] | This letter discusses phenomenological aspects of dimensional reduction predicted by the Causal Dynamical Triangulations (CDT) approach to quantum gravity. The deformed form of the dispersion relation for the fields defined on the CDT space-time is reconstructed. Using the Fermi satellite observations of the GRB 090510... |
1306.1210 | Michael Holst | Michael Holst, Caleb Meier | An Alternative Between Non-unique and Negative Yamabe Solutions to the
Conformal Formulation of the Einstein Constraint Equations | 25 pages, no figures | null | null | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conformal method has been effective for parametrizing solutions to the
Einstein constraint equations on closed 3-manifolds. However, it is still not
well-understood; for example, existence of solutions to the conformal equations
for zero or negative Yamabe metrics is still unknown without the so-called
``CMC'' or... | [
{
"created": "Wed, 5 Jun 2013 19:12:27 GMT",
"version": "v1"
}
] | 2013-06-10 | [
[
"Holst",
"Michael",
""
],
[
"Meier",
"Caleb",
""
]
] | The conformal method has been effective for parametrizing solutions to the Einstein constraint equations on closed 3-manifolds. However, it is still not well-understood; for example, existence of solutions to the conformal equations for zero or negative Yamabe metrics is still unknown without the so-called ``CMC'' or `... |
1704.08651 | Noah Sennett | Noah Sennett, Tanja Hinderer, Jan Steinhoff, Alessandra Buonanno,
Serguei Ossokine | Distinguishing Boson Stars from Black Holes and Neutron Stars from Tidal
Interactions in Inspiraling Binary Systems | 18 pages, 8 figures. Submitted to Physical Review D | Phys. Rev. D 96, 024002 (2017) | 10.1103/PhysRevD.96.024002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary systems containing boson stars---self-gravitating configurations of a
complex scalar field--- can potentially mimic black holes or neutron stars as
gravitational-wave sources. We investigate the extent to which tidal effects in
the gravitational-wave signal can be used to discriminate between these
standard so... | [
{
"created": "Thu, 27 Apr 2017 16:55:55 GMT",
"version": "v1"
}
] | 2017-10-10 | [
[
"Sennett",
"Noah",
""
],
[
"Hinderer",
"Tanja",
""
],
[
"Steinhoff",
"Jan",
""
],
[
"Buonanno",
"Alessandra",
""
],
[
"Ossokine",
"Serguei",
""
]
] | Binary systems containing boson stars---self-gravitating configurations of a complex scalar field--- can potentially mimic black holes or neutron stars as gravitational-wave sources. We investigate the extent to which tidal effects in the gravitational-wave signal can be used to discriminate between these standard sour... |
gr-qc/9411069 | Thibault Damour | T. Damour, A.M. Polyakov | String theory and gravity | 5 pages, PLAIN TEX | Gen.Rel.Grav. 26 (1994) 1171-1176 | 10.1007/BF02106709 | IHES/P/94/1 | gr-qc hep-th | null | It is pointed out that string-loop effects may generate matter couplings for
the dilaton allowing this scalar partner of the tensorial graviton to stay
massless while contributing to macroscopic gravity in a way naturally
compatible with existing experimental data. Under a certain assumption of
universality of the di... | [
{
"created": "Tue, 29 Nov 1994 11:55:58 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Damour",
"T.",
""
],
[
"Polyakov",
"A. M.",
""
]
] | It is pointed out that string-loop effects may generate matter couplings for the dilaton allowing this scalar partner of the tensorial graviton to stay massless while contributing to macroscopic gravity in a way naturally compatible with existing experimental data. Under a certain assumption of universality of the dila... |
1811.03452 | Koray D\"uzta\c{s} | Koray D\"uzta\c{s} | Over-spinning Kerr-Sen black holes with test fields | Accepted to appear IJMPD | null | 10.1142/S0218271819500445 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate validity of the weak form of the cosmic
censorship conjecture in the interaction of Kerr-Sen black holes with neutral
test fields. Previous studies of the Klein-Gordon equation on Kerr-Sen
background imply that superradiance occurs for scalar fields. We show that
scalar fields can overspin... | [
{
"created": "Wed, 7 Nov 2018 08:53:36 GMT",
"version": "v1"
}
] | 2018-11-09 | [
[
"Düztaş",
"Koray",
""
]
] | In this work we investigate validity of the weak form of the cosmic censorship conjecture in the interaction of Kerr-Sen black holes with neutral test fields. Previous studies of the Klein-Gordon equation on Kerr-Sen background imply that superradiance occurs for scalar fields. We show that scalar fields can overspin a... |
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