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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1602.04559 | Sandipan Sengupta | Romesh K. Kaul and Sandipan Sengupta | Degenerate spacetimes in first order gravity | Identical with the journal version | Phys. Rev. D 93, 084026 (2016) | 10.1103/PhysRevD.93.084026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic framework to obtain the most general solutions of the
equations of motion in first order gravity theory with degenerate tetrads.
There are many possible solutions. Generically, these exhibit non-vanishing
torsion even in the absence of any matter coupling. These solutions are shown
to contain ... | [
{
"created": "Mon, 15 Feb 2016 04:26:37 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Apr 2016 03:07:25 GMT",
"version": "v2"
}
] | 2016-04-26 | [
[
"Kaul",
"Romesh K.",
""
],
[
"Sengupta",
"Sandipan",
""
]
] | We present a systematic framework to obtain the most general solutions of the equations of motion in first order gravity theory with degenerate tetrads. There are many possible solutions. Generically, these exhibit non-vanishing torsion even in the absence of any matter coupling. These solutions are shown to contain a ... |
gr-qc/0012110 | Sascha Husa | Sascha Husa, Manuela Campanelli, Roberto Gomez, Jeffrey Winicour and
Yosef Zlochower | Colliding black holes from a null point of view: the close limit | 2 pages, contribution to the 9th Marcel Grossmann meeting (MG9),
Rome, July 2000 | null | null | null | gr-qc | null | We present a characteristic algorithm for computing the perturbations of a
Schwarzschild spacetime by means of solving the Teukolsky equations. Our
methods and results are expected to have direct bearing on the study of binary
black holes presently underway using a fully {\em nonlinear} characteristic
code \cite{Gome... | [
{
"created": "Fri, 29 Dec 2000 17:23:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Husa",
"Sascha",
""
],
[
"Campanelli",
"Manuela",
""
],
[
"Gomez",
"Roberto",
""
],
[
"Winicour",
"Jeffrey",
""
],
[
"Zlochower",
"Yosef",
""
]
] | We present a characteristic algorithm for computing the perturbations of a Schwarzschild spacetime by means of solving the Teukolsky equations. Our methods and results are expected to have direct bearing on the study of binary black holes presently underway using a fully {\em nonlinear} characteristic code \cite{Gomez9... |
gr-qc/0307111 | Ruth Lazkoz | L.P. Chimento and Ruth Lazkoz | Constructing Phantom Cosmologies from Standard Scalar Field Universes | 3 pages, revtex4, new title and minor changes in the main text and
references to match published version | Phys.Rev.Lett. 91 (2003) 211301 | 10.1103/PhysRevLett.91.211301 | null | gr-qc | null | We illustrate how form-invariance transformations can be used for
constructing phantom cosmologies from standard scalar field universes. First,
we discuss how to relate two flat Friedmann-Robertson-Walker cosmologies with
different barotropic indexes $\gamma$ and $\bar \gamma$. Then, we consider the
particular case $... | [
{
"created": "Mon, 28 Jul 2003 14:05:42 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jan 2004 09:29:36 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Chimento",
"L. P.",
""
],
[
"Lazkoz",
"Ruth",
""
]
] | We illustrate how form-invariance transformations can be used for constructing phantom cosmologies from standard scalar field universes. First, we discuss how to relate two flat Friedmann-Robertson-Walker cosmologies with different barotropic indexes $\gamma$ and $\bar \gamma$. Then, we consider the particular case $\b... |
1603.03521 | Wei Li | Jie An and Baorong Chang and Lixin Xu | Cosmic Constraints to wCDM Model from Strong Gravitational Lensing | 6 pages, 2 figures | null | 10.1088/0256-307X/33/7/079801 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the cosmic constraint to $w$CDM model via $118$
strong gravitational lensing systems which are complied from SLACS, BELLS, LSD
and SL2S surveys, where the ratio between two angular diameter distances
$D^{obs} = D_A(z_l,z_s)/D_A(0,z_s)$ is taken as a cosmic observable. To obtain
this ratio, we ... | [
{
"created": "Fri, 11 Mar 2016 05:05:50 GMT",
"version": "v1"
}
] | 2017-03-15 | [
[
"An",
"Jie",
""
],
[
"Chang",
"Baorong",
""
],
[
"Xu",
"Lixin",
""
]
] | In this paper, we study the cosmic constraint to $w$CDM model via $118$ strong gravitational lensing systems which are complied from SLACS, BELLS, LSD and SL2S surveys, where the ratio between two angular diameter distances $D^{obs} = D_A(z_l,z_s)/D_A(0,z_s)$ is taken as a cosmic observable. To obtain this ratio, we ad... |
gr-qc/9401030 | Milan Mijic | Milan Mijic | Stochastic Dynamics of Coarse-Grained Quantum Fields in Inflationary
Universe | 23 pages, Very Plain TeX | Phys.Rev. D49 (1994) 6434-6441 | 10.1103/PhysRevD.49.6434 | null | gr-qc | null | It is shown how coarse-graining of quantum field ^M theory in de Sitter space
leads to the emergence of a classical ^M stochastic description as an effective
theory in the infra-red regime. ^M The quantum state of the coarse-grained
scalar field is found to be a highly^M squeezed coherent state, whose center
performs... | [
{
"created": "Wed, 26 Jan 1994 03:47:18 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Mijic",
"Milan",
""
]
] | It is shown how coarse-graining of quantum field ^M theory in de Sitter space leads to the emergence of a classical ^M stochastic description as an effective theory in the infra-red regime. ^M The quantum state of the coarse-grained scalar field is found to be a highly^M squeezed coherent state, whose center performs a... |
2102.09578 | Parampreet Singh | Meysam Motaharfar, Parampreet Singh | On the role of dissipative effects in the quantum gravitational onset of
warm Starobinsky inflation in a closed universe | 19 pages, 12 figures. Discussion revised. References added. To appear
in Phys. Rev. D | null | 10.1103/PhysRevD.104.106006 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | A problematic feature of low energy scale inflationary models, such as
Starobinsky inflation, in a spatially closed universe is the occurrence of a
recollapse and a big crunch singularity before inflation can even set in. In a
recent work it was shown that this problem can be successfully resolved in loop
quantum cos... | [
{
"created": "Thu, 18 Feb 2021 19:00:29 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 2021 23:18:10 GMT",
"version": "v2"
}
] | 2021-11-24 | [
[
"Motaharfar",
"Meysam",
""
],
[
"Singh",
"Parampreet",
""
]
] | A problematic feature of low energy scale inflationary models, such as Starobinsky inflation, in a spatially closed universe is the occurrence of a recollapse and a big crunch singularity before inflation can even set in. In a recent work it was shown that this problem can be successfully resolved in loop quantum cosmo... |
gr-qc/0007013 | Hod Shahar | Shahar Hod | Black-hole radiation, the fundamental area unit, and the spectrum of
particle species | 4 pages | Phys.Rev. D61 (2000) 124016 | 10.1103/PhysRevD.61.124016 | null | gr-qc hep-th quant-ph | null | Bekenstein and Mukhanov have put forward the idea that, in a quantum theory
of gravity a black hole should have a discrete mass spectrum with a concomitant
{\it discrete} line emission. We note that a direct consequence of this
intriguing prediction is that, compared with blackbody radiation, black-hole
radiance is {... | [
{
"created": "Mon, 10 Jul 2000 07:51:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Hod",
"Shahar",
""
]
] | Bekenstein and Mukhanov have put forward the idea that, in a quantum theory of gravity a black hole should have a discrete mass spectrum with a concomitant {\it discrete} line emission. We note that a direct consequence of this intriguing prediction is that, compared with blackbody radiation, black-hole radiance is {\i... |
1506.08512 | B. S. Ratanpal | B. S. Ratanpal, V. O. Thomas and D. M. Pandya | Anisotropic Star on Pseudo-Spheroidal Spacetime | 19 pages, 8 figures, 1 table | Astrophys Space Sci (2016) 361:65 | 10.1007/s10509-016-2652-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new class of exact solutions of Einstein's field equations representing
anisotropic distribution of matter on pseudo-spheroidal spacetime is obtained.
The parameters appearing in the model are restricted through physical
requirements of the model. It is found that the models given in the present
work is compatible ... | [
{
"created": "Mon, 29 Jun 2015 05:40:37 GMT",
"version": "v1"
}
] | 2016-04-06 | [
[
"Ratanpal",
"B. S.",
""
],
[
"Thomas",
"V. O.",
""
],
[
"Pandya",
"D. M.",
""
]
] | A new class of exact solutions of Einstein's field equations representing anisotropic distribution of matter on pseudo-spheroidal spacetime is obtained. The parameters appearing in the model are restricted through physical requirements of the model. It is found that the models given in the present work is compatible wi... |
0803.3456 | Steven Carlip | S. Carlip | Is Quantum Gravity Necessary? | based on a talk given at Peyresq Physics 11, to appear in Class.
Quant. Grav | Class.Quant.Grav.25:154010,2008 | 10.1088/0264-9381/25/15/154010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In view of the enormous difficulties we seem to face in quantizing general
relativity, we should perhaps consider the possibility that gravity is a
fundamentally classical interaction. Theoretical arguments against such mixed
classical-quantum models are strong, but not conclusive, and the question is
ultimately one ... | [
{
"created": "Mon, 24 Mar 2008 20:13:49 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Carlip",
"S.",
""
]
] | In view of the enormous difficulties we seem to face in quantizing general relativity, we should perhaps consider the possibility that gravity is a fundamentally classical interaction. Theoretical arguments against such mixed classical-quantum models are strong, but not conclusive, and the question is ultimately one fo... |
gr-qc/9809070 | Jonathan Katz | J. I. Katz (Washington U., St. Louis) | Comment on ``Indication, from Pioneer 10/11, Galileo and Ulysses Data,
of an Apparent Anomalous, Weak, Long-Range Acceleration'' | 4pp, Revtex, recoil force now calculated numerically from Pioneer
engineering data, conclusions unchanged | Phys.Rev.Lett. 83 (1999) 1892 | 10.1103/PhysRevLett.83.1892 | null | gr-qc astro-ph | null | The reported anomalous acceleration may be explained as the recoil of
radiated waste RTG heat scattered by the back of the high gain antenna.
| [
{
"created": "Thu, 24 Sep 1998 15:16:26 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 1998 21:00:29 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Dec 1998 21:00:30 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Katz",
"J. I.",
"",
"Washington U., St. Louis"
]
] | The reported anomalous acceleration may be explained as the recoil of radiated waste RTG heat scattered by the back of the high gain antenna. |
gr-qc/0601032 | Philip D. Mannheim | Philip D. Mannheim (University of Connecticut) | Gauge Invariant Treatment of the Energy Carried by a Gravitational Wave | 13 pages, revtex4. Final version. To appear in Phys. Rev. D | Phys.Rev. D74 (2006) 024019 | 10.1103/PhysRevD.74.024019 | null | gr-qc astro-ph hep-th | null | Even though the energy carried by a gravitational wave is not itself gauge
invariant, the interaction with a gravitational antenna of the gravitational
wave which carries that energy is. It therefore has to be possible to make some
statements which involve the energy which are in fact gauge invariant, and it
is the o... | [
{
"created": "Mon, 9 Jan 2006 16:20:14 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2006 13:09:03 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Jun 2006 18:57:25 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Mannheim",
"Philip D.",
"",
"University of Connecticut"
]
] | Even though the energy carried by a gravitational wave is not itself gauge invariant, the interaction with a gravitational antenna of the gravitational wave which carries that energy is. It therefore has to be possible to make some statements which involve the energy which are in fact gauge invariant, and it is the obj... |
gr-qc/0211084 | Joan Centrella | Joan M. Centrella | Resource Letter GrW-1: Gravitational Waves | AAPT/AJP Resource Letter, American Journal of Physics, in press, 9
pages, 97 references | Am.J.Phys. 71 (2003) 520-525 | 10.1119/1.1543555 | null | gr-qc astro-ph | null | This Resource Letter provides a guide to the literature on the physics and
astrophysics of gravitational waves. Journals, books, reports, archives, and
websites are provided as basic resources and for current research frontiers in
detectors, data analysis, and astrophysical source modeling.
| [
{
"created": "Mon, 25 Nov 2002 21:21:17 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Centrella",
"Joan M.",
""
]
] | This Resource Letter provides a guide to the literature on the physics and astrophysics of gravitational waves. Journals, books, reports, archives, and websites are provided as basic resources and for current research frontiers in detectors, data analysis, and astrophysical source modeling. |
1111.7127 | Igor Khavkine | Igor Khavkine | Quantum astrometric observables I: time delay in classical and quantum
gravity | revtex4-1, 21 pages, 7 figures (published version); added journal ref | Phys. Rev. D 85, 124014 (2012) | 10.1103/PhysRevD.85.124014 | ITP-UU-10/02; SPIN-10-02 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of diffeomorphism invariant, physical observables, so-called
astrometric observables, is introduced. A particularly simple example, the time
delay, which expresses the difference between two initially synchronized proper
time clocks in relative inertial motion, is analyzed in detail. It is found to
satisfy so... | [
{
"created": "Wed, 30 Nov 2011 11:21:58 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jun 2012 14:07:48 GMT",
"version": "v2"
}
] | 2012-06-26 | [
[
"Khavkine",
"Igor",
""
]
] | A class of diffeomorphism invariant, physical observables, so-called astrometric observables, is introduced. A particularly simple example, the time delay, which expresses the difference between two initially synchronized proper time clocks in relative inertial motion, is analyzed in detail. It is found to satisfy some... |
1008.3619 | Marco Mamone-Capria | Marco Mamone-Capria | Spatial Directions, Anisotropy and Special Relativity | 24 pages, 2 figures. Final enlarged and slightly corrected version.
Keywords: relativity, very special relativity, spatial isotropy, reciprocity,
differential aging; Foundations of Physics, 2011 | Found.Phys.41:1375-1397,2011 | 10.1007/s10701-011-9554-3 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of an objective spatial direction in special relativity is
investigated and theories assuming light-speed isotropy while accepting the
existence of a privileged spatial direction are classified. A natural
generalization of the proper time principle is introduced which makes it
possible to devise experimen... | [
{
"created": "Sat, 21 Aug 2010 09:40:25 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 2011 18:04:57 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Feb 2011 17:58:22 GMT",
"version": "v3"
},
{
"created": "Fri, 20 May 2011 09:36:05 GMT",
"version": "v4"
}
] | 2011-06-30 | [
[
"Mamone-Capria",
"Marco",
""
]
] | The concept of an objective spatial direction in special relativity is investigated and theories assuming light-speed isotropy while accepting the existence of a privileged spatial direction are classified. A natural generalization of the proper time principle is introduced which makes it possible to devise experimenta... |
2206.02783 | Bivudutta Mishra Dr. | A.S. Agrawal, B. Mishra, P.K. Agrawal | Matter Bounce Scenario in Extended Symmetric Teleparallel Gravity | 10 pages, 6 figures | Eur. Phys. J. C (2023) 83:113 | 10.1140/epjc/s10052-023-11266-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have shown the matter bounce scenario of the Universe in an
extended symmetric teleparallel gravity, the f(Q) gravity. Motivated from the
bouncing scenario and loop quantum cosmology (LQC), the form of the function
$f(Q)$ has been obtained at the backdrop of Friedmann-Lemaitre-Robertson Walker
(FLRW... | [
{
"created": "Sat, 4 Jun 2022 05:59:37 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Feb 2023 06:08:02 GMT",
"version": "v2"
}
] | 2023-02-06 | [
[
"Agrawal",
"A. S.",
""
],
[
"Mishra",
"B.",
""
],
[
"Agrawal",
"P. K.",
""
]
] | In this paper, we have shown the matter bounce scenario of the Universe in an extended symmetric teleparallel gravity, the f(Q) gravity. Motivated from the bouncing scenario and loop quantum cosmology (LQC), the form of the function $f(Q)$ has been obtained at the backdrop of Friedmann-Lemaitre-Robertson Walker (FLRW) ... |
2203.14696 | Branislav Cvetkovi\'c | Milutin Blagojevi\'c and Branislav Cvetkovi\'c | Entropy of Kerr--Newman--AdS black holes with torsion | LaTex, 17 pages | null | 10.1103/PhysRevD.105.104014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The canonical approach to black hole entropy in Poincar\'e gauge theory
without matter is extended to include Maxwell field as a matter source. The new
formalism is used to calculate asymptotic charges and entropy of
Kerr--Newmann--AdS black holes with torsion. The result implies that the first
law, with a nontrivial... | [
{
"created": "Thu, 24 Mar 2022 21:18:25 GMT",
"version": "v1"
}
] | 2022-05-25 | [
[
"Blagojević",
"Milutin",
""
],
[
"Cvetković",
"Branislav",
""
]
] | The canonical approach to black hole entropy in Poincar\'e gauge theory without matter is extended to include Maxwell field as a matter source. The new formalism is used to calculate asymptotic charges and entropy of Kerr--Newmann--AdS black holes with torsion. The result implies that the first law, with a nontrivial c... |
2311.02118 | Claudio Nassif Cruz | Cl\'audio Nassif Cruz and A. C. Amaro de Faria Jr | A brief review of a modified relativity that explains cosmological
constant | 15 pages, 2 figures. arXiv admin note: substantial text overlap with
arXiv:2303.14120 | Reviews in Physics 11 (2023) 100088 | 10.1016/j.revip.2023.100088 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | The present review aims to show that a modified space-time with an invariant
minimum speed provides a relation with Weyl geometry in the Newtonian
approximation of weak-field. The deformed Special Relativity so-called
Symmetrical Special Relativity (SSR) has an invariant minimum speed $V$, which
is associated with a ... | [
{
"created": "Fri, 3 Nov 2023 03:37:15 GMT",
"version": "v1"
}
] | 2023-11-07 | [
[
"Cruz",
"Cláudio Nassif",
""
],
[
"Faria",
"A. C. Amaro de",
"Jr"
]
] | The present review aims to show that a modified space-time with an invariant minimum speed provides a relation with Weyl geometry in the Newtonian approximation of weak-field. The deformed Special Relativity so-called Symmetrical Special Relativity (SSR) has an invariant minimum speed $V$, which is associated with a pr... |
1311.6087 | Alan Parry | Alan R. Parry | Wave Dark Matter and Dwarf Spheroidal Galaxies | This is a posting of my PhD thesis. 143 pages, 27 figures, 3 tables.
Alan R. Parry, "Wave Dark Matter and Dwarf Spheroidal Galaxies", PhD Thesis,
Duke University, Durham, NC (March 2013) | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a model of dark matter called wave dark matter (also known as
scalar field dark matter and boson stars) which has recently been motivated by
a new geometric perspective by Bray. Wave dark matter describes dark matter as
a scalar field which satisfies the Einstein-Klein-Gordon equations. These
equations rel... | [
{
"created": "Sun, 24 Nov 2013 06:46:31 GMT",
"version": "v1"
}
] | 2013-11-26 | [
[
"Parry",
"Alan R.",
""
]
] | We explore a model of dark matter called wave dark matter (also known as scalar field dark matter and boson stars) which has recently been motivated by a new geometric perspective by Bray. Wave dark matter describes dark matter as a scalar field which satisfies the Einstein-Klein-Gordon equations. These equations rely ... |
1402.5935 | Emmanuil Saridakis | A. Paliathanasis (Athens U.), S. Basilakos (RCAAM, Academy of Athens),
E.N. Saridakis (Natl. Tech. U., Athens and Valparaiso U., Catolica), S.
Capozziello (Naples U. and INFN, Naples), K. Atazadeh, F. Darabi (Azarbaijan
U. of Tarbiat Moallem), M. Tsamparlis (Athens U.) | New Schwarzschild-like solutions in f(T) gravity through Noether
symmetries | 10 pages, to appear in Phys. Rev. D | Phys. Rev. D 89, 104042 (2014) | 10.1103/PhysRevD.89.104042 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spherically symmetric solutions for f(T) gravity models are derived by the so
called Noether Symmetry Approach. First, we present a full set of Noether
symmetries for some minisuperspace models. Then, we compute analytical
solutions and find that spherically symmetric solutions in f(T) gravity can be
recast in terms ... | [
{
"created": "Mon, 24 Feb 2014 20:17:47 GMT",
"version": "v1"
},
{
"created": "Sun, 11 May 2014 08:01:14 GMT",
"version": "v2"
}
] | 2014-05-28 | [
[
"Paliathanasis",
"A.",
"",
"Athens U."
],
[
"Basilakos",
"S.",
"",
"RCAAM, Academy of Athens"
],
[
"Saridakis",
"E. N.",
"",
"Natl. Tech. U., Athens and Valparaiso U., Catolica"
],
[
"Capozziello",
"S.",
"",
"Naples U. and INFN, Naples"
... | Spherically symmetric solutions for f(T) gravity models are derived by the so called Noether Symmetry Approach. First, we present a full set of Noether symmetries for some minisuperspace models. Then, we compute analytical solutions and find that spherically symmetric solutions in f(T) gravity can be recast in terms of... |
2004.12074 | Xiao-Xiong Zeng | Xiao-Xiong Zeng, Hai-Qing Zhang, Hongbao Zhang | Shadows and photon spheres with spherical accretions in the
four-dimensional Gauss-Bonnet black hole | published version | Eur. Phys. J. C (2020) 80:872 | 10.1140/epjc/s10052-020-08449-y | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We investigate the shadows and photon spheres of the four-dimensional
Gauss-Bonnet black hole with the static and infalling spherical accretions. We
show that for both cases, the shadow and photon sphere are always present. The
radii of the shadow and photon sphere are independent of the profiles of
accretion for a f... | [
{
"created": "Sat, 25 Apr 2020 07:45:05 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2020 07:51:27 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jul 2020 12:13:21 GMT",
"version": "v3"
},
{
"created": "Sat, 26 Sep 2020 11:06:19 GMT",
"version": "v4"
}
] | 2020-10-28 | [
[
"Zeng",
"Xiao-Xiong",
""
],
[
"Zhang",
"Hai-Qing",
""
],
[
"Zhang",
"Hongbao",
""
]
] | We investigate the shadows and photon spheres of the four-dimensional Gauss-Bonnet black hole with the static and infalling spherical accretions. We show that for both cases, the shadow and photon sphere are always present. The radii of the shadow and photon sphere are independent of the profiles of accretion for a fix... |
0808.0404 | Sushil Srivastava | S.K.Srivastava | Varying Gravitational Constant as Well as Cosmology from the Early
Inflation to Late Acceleration and Future Universe | 31pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here, cosmology is obtained from the variable gravitational constant $ G
\propto \phi^{-2}$ with $ \phi(x) $ being a scalar and its fluctuations around
the ground state. The gravitational action contains Einstein-Hilbert like term
with variable $ G $, kinetic energy and self-interaction potential for $
\phi(x) $. Two... | [
{
"created": "Mon, 4 Aug 2008 09:28:14 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Sep 2008 01:03:29 GMT",
"version": "v2"
}
] | 2008-09-19 | [
[
"Srivastava",
"S. K.",
""
]
] | Here, cosmology is obtained from the variable gravitational constant $ G \propto \phi^{-2}$ with $ \phi(x) $ being a scalar and its fluctuations around the ground state. The gravitational action contains Einstein-Hilbert like term with variable $ G $, kinetic energy and self-interaction potential for $ \phi(x) $. Two p... |
1911.08316 | Muhammad Sharif | M. Sharif and Arfa Waseem | Charged Gravastars with Conformal Motion in f(R,T) Gravity | 21 pages, 5 figures | Astrophys. Space Sci. 364(2019)189 | 10.1007/s10509-019-3680-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies the effects of charge on a peculiar stellar object,
recognized as gravastar, under the influence of $f(R,T)$ gravity by considering
the conjecture of Mazur and Mottola in general relativity. The gravastar is
also known as an alternative to a black hole and is expressed by three distinct
domains nam... | [
{
"created": "Mon, 18 Nov 2019 07:16:58 GMT",
"version": "v1"
}
] | 2019-11-27 | [
[
"Sharif",
"M.",
""
],
[
"Waseem",
"Arfa",
""
]
] | This paper studies the effects of charge on a peculiar stellar object, recognized as gravastar, under the influence of $f(R,T)$ gravity by considering the conjecture of Mazur and Mottola in general relativity. The gravastar is also known as an alternative to a black hole and is expressed by three distinct domains named... |
gr-qc/0204072 | Mariam Bouhmadi-Lopez | M. Bouhmadi-Lopez, L. J. Garay and P. F. Gonzalez-Diaz | Quantum behavior of FRW radiation-filled universes | RevTeX 4, 16 pages, 2 figures | Phys.Rev. D66 (2002) 083504 | 10.1103/PhysRevD.66.083504 | null | gr-qc | null | We study the quantum vacuum fluctuations around closed
Friedmann-Robertson-Walker (FRW) radiation-filled universes with nonvanishing
cosmological constant. These vacuum fluctuations are represented by a
conformally coupled massive scalar field and are treated in the lowest order of
perturbation theory. In the semicla... | [
{
"created": "Tue, 23 Apr 2002 09:45:29 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bouhmadi-Lopez",
"M.",
""
],
[
"Garay",
"L. J.",
""
],
[
"Gonzalez-Diaz",
"P. F.",
""
]
] | We study the quantum vacuum fluctuations around closed Friedmann-Robertson-Walker (FRW) radiation-filled universes with nonvanishing cosmological constant. These vacuum fluctuations are represented by a conformally coupled massive scalar field and are treated in the lowest order of perturbation theory. In the semiclass... |
gr-qc/0006105 | Yee J. Ng | Y. Jack Ng (University of North Carolina at Chapel Hill) | From computation to black holes and space-time foam | A misidentification of computer speeds is corrected. Our results for
black hole computation now agree with those given by S. Lloyd. All other
conclusions remain unchanged | Phys.Rev.Lett. 86 (2001) 2946; Erratum-ibid. 88 (2002) 139902 | 10.1103/PhysRevLett.86.2946 | null | gr-qc astro-ph hep-ph hep-th quant-ph | null | We show that quantum mechanics and general relativity limit the speed
$\tilde{\nu}$ of a simple computer (such as a black hole) and its memory space
$I$ to $\tilde{\nu}^2 I^{-1} \lsim t_P^{-2}$, where $t_P$ is the Planck time.
We also show that the life-time of a simple clock and its precision are
similarly limited. ... | [
{
"created": "Thu, 29 Jun 2000 16:40:42 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2000 22:01:16 GMT",
"version": "v2"
},
{
"created": "Sun, 15 Oct 2000 19:11:42 GMT",
"version": "v3"
},
{
"created": "Thu, 8 Feb 2001 21:27:14 GMT",
"version": "v4"
},
{
"cre... | 2009-10-31 | [
[
"Ng",
"Y. Jack",
"",
"University of North Carolina at Chapel Hill"
]
] | We show that quantum mechanics and general relativity limit the speed $\tilde{\nu}$ of a simple computer (such as a black hole) and its memory space $I$ to $\tilde{\nu}^2 I^{-1} \lsim t_P^{-2}$, where $t_P$ is the Planck time. We also show that the life-time of a simple clock and its precision are similarly limited. Th... |
2305.04969 | Han Yan | Han Yan, Xian Chen, Alejandro Torres-Orjuela | Calculating the Gravitational Waves Emitted from High-speed Sources | 9 pages, 2 figures. Accepted by PRD | Phys. Rev. D 107, 103044 (2023) | 10.1103/PhysRevD.107.103044 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility of forming gravitational-wave sources with high
center-of-mass (c.m.) velocities in the vicinity of supermassive black holes
requires us to develop a method of deriving the waveform in the observer's
frame. Here we show that in the limit where the c.m. velocity is high but the
relative velocities of t... | [
{
"created": "Mon, 8 May 2023 18:03:27 GMT",
"version": "v1"
}
] | 2023-07-07 | [
[
"Yan",
"Han",
""
],
[
"Chen",
"Xian",
""
],
[
"Torres-Orjuela",
"Alejandro",
""
]
] | The possibility of forming gravitational-wave sources with high center-of-mass (c.m.) velocities in the vicinity of supermassive black holes requires us to develop a method of deriving the waveform in the observer's frame. Here we show that in the limit where the c.m. velocity is high but the relative velocities of the... |
1612.09309 | David Wiltshire | Alan A. Coley, David L. Wiltshire | What is General Relativity? | 18 pages. Invited article for Physica Scripta Focus issue on 21st
Century Frontiers. v2: Appendix amended, references added. v3: Small
corrections, references added, matches published version | Phys. Scripta 92 (2017) 053001 | 10.1088/1402-4896/aa6857 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity is a set of physical and geometric principles, which lead
to a set of (Einstein) field equations that determine the gravitational field,
and to the geodesic equations that describe light propagation and the motion of
particles on the background. But open questions remain, including: What is the
sca... | [
{
"created": "Thu, 29 Dec 2016 21:17:32 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jan 2017 18:54:38 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Apr 2017 14:04:36 GMT",
"version": "v3"
}
] | 2017-04-19 | [
[
"Coley",
"Alan A.",
""
],
[
"Wiltshire",
"David L.",
""
]
] | General relativity is a set of physical and geometric principles, which lead to a set of (Einstein) field equations that determine the gravitational field, and to the geodesic equations that describe light propagation and the motion of particles on the background. But open questions remain, including: What is the scale... |
gr-qc/0110096 | Kechkin O. V. | A. Herrera-Aguilar, Oleg V. Kechkin | Kalb--Ramond dipole solution in low-energy bosonic string theory | 14 pages in LATEX | Gen.Rel.Grav.34:1331-1344,2002 | 10.1023/A:1020078132237 | null | gr-qc | null | We construct a new solution subspace for the bosonic string theory toroidally
compactified to 3 dimensions. This subspace corresponds to the complex harmonic
scalar field coupled to the effective 3--dimensional gravity. We calculate a
class of the asymptotically flat and free of the Dirac string peculiarity
solutions... | [
{
"created": "Tue, 23 Oct 2001 01:57:30 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Herrera-Aguilar",
"A.",
""
],
[
"Kechkin",
"Oleg V.",
""
]
] | We construct a new solution subspace for the bosonic string theory toroidally compactified to 3 dimensions. This subspace corresponds to the complex harmonic scalar field coupled to the effective 3--dimensional gravity. We calculate a class of the asymptotically flat and free of the Dirac string peculiarity solutions w... |
1507.03949 | Ali \"Ovg\"un | A. \"Ovg\"un and I. Sakalli | On a Particular Thin-shell Wormhole | 9 pages, accepted for publication in TMPh (Theoretical and
Mathematical Physics) | I. Theor Math Phys (2017) 190: 120 | 10.1134/S004057791701010X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, using a black hole with scalar hair, we construct a scalar
thin-shell wormhole (TSW) in 2+1 dimensions by applying the Visser's famous cut
and paste technique. The surface stress, which is concentrated at the wormhole
throat is determined by using the Darmois-Israel formalism. By employing the
various ... | [
{
"created": "Tue, 14 Jul 2015 17:44:10 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2015 08:10:49 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Nov 2015 12:27:47 GMT",
"version": "v3"
},
{
"created": "Thu, 19 May 2016 13:18:35 GMT",
"version": "v4"
}
] | 2017-02-14 | [
[
"Övgün",
"A.",
""
],
[
"Sakalli",
"I.",
""
]
] | In this paper, using a black hole with scalar hair, we construct a scalar thin-shell wormhole (TSW) in 2+1 dimensions by applying the Visser's famous cut and paste technique. The surface stress, which is concentrated at the wormhole throat is determined by using the Darmois-Israel formalism. By employing the various ga... |
1404.4311 | Kazuharu Bamba | Kazuharu Bamba, Guido Cognola, Sergei D. Odintsov and Sergio Zerbini | One-loop Modified Gravity in de Sitter Universe, Quantum Corrected
Inflation, and its Confrontation with the Planck Result | 21 pages, no figure, several references added | Phys. Rev. D 90, 023525 (2014) | 10.1103/PhysRevD.90.023525 | OCHA-PP-322 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by issues on inflation, a generalized modified gravity model is
investigated, where the model Lagrangian is described by a smooth function
$f(R, K, \phi)$ of the Ricci scalar $R$, the kinetic term $K$ of a scalar field
$\phi$. In particular, the one-loop effective action in the de Sitter
background is exami... | [
{
"created": "Wed, 16 Apr 2014 16:59:13 GMT",
"version": "v1"
},
{
"created": "Thu, 22 May 2014 06:11:36 GMT",
"version": "v2"
}
] | 2014-07-23 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Cognola",
"Guido",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Zerbini",
"Sergio",
""
]
] | Motivated by issues on inflation, a generalized modified gravity model is investigated, where the model Lagrangian is described by a smooth function $f(R, K, \phi)$ of the Ricci scalar $R$, the kinetic term $K$ of a scalar field $\phi$. In particular, the one-loop effective action in the de Sitter background is examine... |
1609.06544 | Luis Granda | L. N. Granda and E. Loaiza | Phase space analysis for a scalar-tensor model with kinetic and
Gauss-Bonnet couplings | 17 pages, 9 figures, accepted in PRD | null | 10.1103/PhysRevD.94.063528 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phase space for an scalar-tensor string inspired model of dark
energy with non minimal kinetic and Gauss Bonnet couplings. The form of the
scalar potential and of the coupling terms is of the exponential type, which
give rise to appealing cosmological solutions. The critical points describe a
variety of ... | [
{
"created": "Wed, 21 Sep 2016 13:11:16 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"Granda",
"L. N.",
""
],
[
"Loaiza",
"E.",
""
]
] | We study the phase space for an scalar-tensor string inspired model of dark energy with non minimal kinetic and Gauss Bonnet couplings. The form of the scalar potential and of the coupling terms is of the exponential type, which give rise to appealing cosmological solutions. The critical points describe a variety of co... |
1609.07904 | Beatriz Elizaga Navascu\'es | Jer\'onimo Cortez, Beatriz Elizaga Navascu\'es, Mercedes
Mart\'in-Benito, Guillermo A. Mena Marug\'an, Jos\'e M. Velhinho | Dirac fields in flat FLRW cosmology: Uniqueness of the Fock quantization | 19 pages, submitted for publication to Annals of Physics | null | 10.1016/j.aop.2016.11.005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the issue of the infinite ambiguity that affects the construction
of a Fock quantization of a Dirac field propagating in a cosmological spacetime
with flat compact sections. In particular, we discuss a physical criterion that
restricts to a unique possibility (up to unitary equivalence) the infinite set
of... | [
{
"created": "Mon, 26 Sep 2016 09:44:09 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Cortez",
"Jerónimo",
""
],
[
"Navascués",
"Beatriz Elizaga",
""
],
[
"Martín-Benito",
"Mercedes",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
],
[
"Velhinho",
"José M.",
""
]
] | We address the issue of the infinite ambiguity that affects the construction of a Fock quantization of a Dirac field propagating in a cosmological spacetime with flat compact sections. In particular, we discuss a physical criterion that restricts to a unique possibility (up to unitary equivalence) the infinite set of a... |
2207.10089 | Nuno M. Santos | Nuno M. Santos, Carlos. A. R. Herdeiro, Eugen Radu | A little hair can make a big difference: thermodynamic stability of
quasi-bald asymptotically-flat black holes | 11 pages, 4 figures. Comments are welcome | Phys. Rev. D 106 (2022) 12 | 10.1103/PhysRevD.106.124005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The local thermodynamic stability of a black hole (BH) in the canonical
ensemble is defined by the positivity of the specific heat at constant global
charges. Schwarzschild BHs in thermodynamic equilibrium with an energy
reservoir are always unstable against small fluctuations of energy, whereas
sufficiently near-ext... | [
{
"created": "Wed, 20 Jul 2022 18:00:00 GMT",
"version": "v1"
}
] | 2024-03-29 | [
[
"Santos",
"Nuno M.",
""
],
[
"Herdeiro",
"Carlos. A. R.",
""
],
[
"Radu",
"Eugen",
""
]
] | The local thermodynamic stability of a black hole (BH) in the canonical ensemble is defined by the positivity of the specific heat at constant global charges. Schwarzschild BHs in thermodynamic equilibrium with an energy reservoir are always unstable against small fluctuations of energy, whereas sufficiently near-extre... |
1412.1803 | Mark A. Scheel | Mark A. Scheel, Matthew Giesler, Daniel A. Hemberger, Geoffrey
Lovelace, Kevin Kuper, Michael Boyle, Bela Szilagyi, Lawrence E. Kidder | Improved methods for simulating nearly extremal binary black holes | 18 pages, 18 figures | null | 10.1088/0264-9381/32/10/105009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astrophysical black holes could be nearly extremal (that is, rotating nearly
as fast as possible); therefore, nearly extremal black holes could be among the
binaries that current and future gravitational-wave observatories will detect.
Predicting the gravitational waves emitted by merging black holes requires
numeric... | [
{
"created": "Thu, 4 Dec 2014 20:34:08 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Scheel",
"Mark A.",
""
],
[
"Giesler",
"Matthew",
""
],
[
"Hemberger",
"Daniel A.",
""
],
[
"Lovelace",
"Geoffrey",
""
],
[
"Kuper",
"Kevin",
""
],
[
"Boyle",
"Michael",
""
],
[
"Szilagyi",
"Bela",
""
],... | Astrophysical black holes could be nearly extremal (that is, rotating nearly as fast as possible); therefore, nearly extremal black holes could be among the binaries that current and future gravitational-wave observatories will detect. Predicting the gravitational waves emitted by merging black holes requires numerical... |
2012.01838 | Daniel Sobral Blanco | Daniel Sobral-Blanco and Lucas Lombriser | Exploring the self-tuning of the cosmological constant from Planck mass
variation | 15 pages, 1 figure. V3 version accepted for publication at CQG | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Recently, the variation of the Planck mass in the General Relativistic
Einstein-Hilbert action was proposed as a self-tuning mechanism of the
cosmological constant, preventing Standard Model vacuum energy from freely
gravitating and enabling an estimation of the magnitude of its observed value.
We explore here new as... | [
{
"created": "Thu, 3 Dec 2020 11:13:59 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2021 09:35:08 GMT",
"version": "v2"
},
{
"created": "Sun, 31 Oct 2021 11:23:20 GMT",
"version": "v3"
}
] | 2021-11-02 | [
[
"Sobral-Blanco",
"Daniel",
""
],
[
"Lombriser",
"Lucas",
""
]
] | Recently, the variation of the Planck mass in the General Relativistic Einstein-Hilbert action was proposed as a self-tuning mechanism of the cosmological constant, preventing Standard Model vacuum energy from freely gravitating and enabling an estimation of the magnitude of its observed value. We explore here new aspe... |
2303.07873 | Przemyslaw Malkiewicz | Herve Bergeron, Jaime de Cabo Martin, Jean-Pierre Gazeau and
Przemyslaw Malkiewicz | Can a quantum mixmaster universe undergo a spontaneous inflationary
phase? | 15 pages, 6 figures | Phys. Rev. D 108, 043534 (2023) | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a semiclassical model of the mixmaster universe. We first derive the
quantum model and then introduce its semiclassical approximation. We employ a
general integral quantization method that respects the symmetries of the model
given by the affine and the Weyl-Heisenberg groups, and can produce a wide
class of... | [
{
"created": "Tue, 14 Mar 2023 13:06:02 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Sep 2023 05:25:52 GMT",
"version": "v2"
}
] | 2023-09-06 | [
[
"Bergeron",
"Herve",
""
],
[
"Martin",
"Jaime de Cabo",
""
],
[
"Gazeau",
"Jean-Pierre",
""
],
[
"Malkiewicz",
"Przemyslaw",
""
]
] | We study a semiclassical model of the mixmaster universe. We first derive the quantum model and then introduce its semiclassical approximation. We employ a general integral quantization method that respects the symmetries of the model given by the affine and the Weyl-Heisenberg groups, and can produce a wide class of q... |
1706.01243 | Adrien Bourgoin | Adrien Bourgoin, Aur\'elien Hees, Christophe Le Poncin-Lafitte,
S\'ebastien Bouquillon, G\'erard Francou and Marie-Christine Angonin | Constraints on Lorentz symmetry violations with Lunar Laser Ranging | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new constraints on Lorentz symmetry (LS) violations with lunar
laser ranging (LLR). Those constraints are derived in the standard-model
extension (SME) framework aiming at parameterizing any LS deviations in all
sectors of physics. We restrict ourself to two sectors namely the pure
gravitational sector of ... | [
{
"created": "Mon, 5 Jun 2017 09:07:50 GMT",
"version": "v1"
}
] | 2017-06-06 | [
[
"Bourgoin",
"Adrien",
""
],
[
"Hees",
"Aurélien",
""
],
[
"Poncin-Lafitte",
"Christophe Le",
""
],
[
"Bouquillon",
"Sébastien",
""
],
[
"Francou",
"Gérard",
""
],
[
"Angonin",
"Marie-Christine",
""
]
] | We present new constraints on Lorentz symmetry (LS) violations with lunar laser ranging (LLR). Those constraints are derived in the standard-model extension (SME) framework aiming at parameterizing any LS deviations in all sectors of physics. We restrict ourself to two sectors namely the pure gravitational sector of th... |
gr-qc/0406089 | G. S. Bisnovatyi-Kogan | G.S. Bisnovatyi-Kogan and V.N.Rudenko | Very high frequency gravitational wave background in the universe | 14 pages | Class.Quant.Grav.21:3347-3359,2004 | 10.1088/0264-9381/21/14/001 | null | gr-qc astro-ph | null | Astrophysical sources of high frequency gravitational radiation are
considered in association with a new interest to very sensitive HFGW receivers
required for the laboratory GW Hertz experiment. A special attention is paid to
the phenomenon of primordial black holes evaporation. They act like black body
to all kinds... | [
{
"created": "Tue, 22 Jun 2004 11:35:28 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Bisnovatyi-Kogan",
"G. S.",
""
],
[
"Rudenko",
"V. N.",
""
]
] | Astrophysical sources of high frequency gravitational radiation are considered in association with a new interest to very sensitive HFGW receivers required for the laboratory GW Hertz experiment. A special attention is paid to the phenomenon of primordial black holes evaporation. They act like black body to all kinds o... |
2004.03141 | Minyong Guo | Cheng-Yong Zhang, Shao-Jun Zhang, Peng-Cheng Li and Minyong Guo | Superradiance and stability of the novel 4D charged
Einstein-Gauss-Bonnet black hole | 21 pages, 6 figures, references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated the superradiance and stability of the novel 4D charged
Einstein-Gauss-Bonnet black hole which is recently inspired by Glavan and Lin
[Phys. Rev. Lett. 124, 081301 (2020)]. We found that the positive Gauss-Bonnet
coupling consant $\alpha$ enhances the superradiance, while the negative
$\alpha$ suppres... | [
{
"created": "Tue, 7 Apr 2020 05:57:34 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Apr 2020 11:56:16 GMT",
"version": "v2"
}
] | 2020-04-10 | [
[
"Zhang",
"Cheng-Yong",
""
],
[
"Zhang",
"Shao-Jun",
""
],
[
"Li",
"Peng-Cheng",
""
],
[
"Guo",
"Minyong",
""
]
] | We investigated the superradiance and stability of the novel 4D charged Einstein-Gauss-Bonnet black hole which is recently inspired by Glavan and Lin [Phys. Rev. Lett. 124, 081301 (2020)]. We found that the positive Gauss-Bonnet coupling consant $\alpha$ enhances the superradiance, while the negative $\alpha$ suppresse... |
2203.07594 | Umananda Dev Goswami | Dhruba Jyoti Gogoi and Umananda Dev Goswami | Quasinormal Modes and Hawking Radiation Sparsity of GUP corrected Black
Holes in Bumblebee Gravity with Topological Defects | 40 pages, 23 figures | JCAP 06 (2022) 029 | 10.1088/1475-7516/2022/06/029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have obtained the Generalized Uncertainty Principle (GUP) corrected de
Sitter and anti-de Sitter black hole solutions in bumblebee gravity with a
topological defect. We have calculated the scalar, electromagnetic and
gravitational quasinormal modes for the both vanishing and non-vanishing
effective cosmological co... | [
{
"created": "Tue, 15 Mar 2022 01:47:46 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Jul 2022 11:05:44 GMT",
"version": "v2"
}
] | 2022-07-06 | [
[
"Gogoi",
"Dhruba Jyoti",
""
],
[
"Goswami",
"Umananda Dev",
""
]
] | We have obtained the Generalized Uncertainty Principle (GUP) corrected de Sitter and anti-de Sitter black hole solutions in bumblebee gravity with a topological defect. We have calculated the scalar, electromagnetic and gravitational quasinormal modes for the both vanishing and non-vanishing effective cosmological cons... |
2301.08055 | Shibendu Gupta Choudhury | Shibendu Gupta Choudhury | Application of the Raychaudhuri Equation in Gravitational Systems | Thesis accepted for the award of PhD degree of IISER Kolkata,
December 2022 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The works reported in this thesis primarily address the application of the
Raychaudhuri equation in two intriguing problems in gravitational physics.
These problems still lack universally accepted explanations. The first problem
is related to the existence of spacetime singularities. We aim to find possible
escape ro... | [
{
"created": "Thu, 19 Jan 2023 13:04:49 GMT",
"version": "v1"
}
] | 2023-01-20 | [
[
"Choudhury",
"Shibendu Gupta",
""
]
] | The works reported in this thesis primarily address the application of the Raychaudhuri equation in two intriguing problems in gravitational physics. These problems still lack universally accepted explanations. The first problem is related to the existence of spacetime singularities. We aim to find possible escape rout... |
0906.1098 | David Kofro\v{n} | Jiri Bicak, David Kofron | Accelerating electromagnetic magic field from the C-metric | 22 pages, 5 figures | Gen.Rel.Grav.41:1981-2001,2009 | 10.1007/s10714-009-0816-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various aspects of the C-metric representing two rotating charged black holes
accelerated in opposite directions are summarized and its limits are
considered. A particular attention is paid to the special-relativistic limit in
which the electromagnetic field becomes the "magic field" of two oppositely
accelerated rot... | [
{
"created": "Fri, 5 Jun 2009 11:53:32 GMT",
"version": "v1"
}
] | 2009-09-28 | [
[
"Bicak",
"Jiri",
""
],
[
"Kofron",
"David",
""
]
] | Various aspects of the C-metric representing two rotating charged black holes accelerated in opposite directions are summarized and its limits are considered. A particular attention is paid to the special-relativistic limit in which the electromagnetic field becomes the "magic field" of two oppositely accelerated rotat... |
2009.03402 | Mohsen Fathi | Mohsen Fathi, J.R. Villanueva | The role of elliptic integrals in calculating the gravitational lensing
of a charged Weyl black hole surrounded by plasma | 19 pages, 14 figures | Vestnik KRAUNC. Fiz.-mat. nauki., 36: 3, 167-190 (2021) | 10.26117/2079-6641-2021-36-3-165-188 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we mainly aim at highlighting the importance of
(hyper-)elliptic integrals in the study of gravitational effects caused by
strongly gravitating systems. For this, we study the application of elliptic
integrals in calculating the light deflection as it passes a plasmic medium,
surrounding a charged Weyl... | [
{
"created": "Mon, 7 Sep 2020 20:19:23 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Nov 2020 16:21:51 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Oct 2021 13:38:47 GMT",
"version": "v3"
}
] | 2021-11-23 | [
[
"Fathi",
"Mohsen",
""
],
[
"Villanueva",
"J. R.",
""
]
] | In this paper, we mainly aim at highlighting the importance of (hyper-)elliptic integrals in the study of gravitational effects caused by strongly gravitating systems. For this, we study the application of elliptic integrals in calculating the light deflection as it passes a plasmic medium, surrounding a charged Weyl b... |
gr-qc/0105024 | M. B. Altaie | M.B.Altaie | Quantum black hole inflation | 18 pages, Latex | null | null | null | gr-qc | null | In this paper we follow a new approach for particle creation by a localized
strong gravitational field. The approach is based on a definition of the
physical vacuum drawn from Heisenberg uncertainty principle. Using the fact
that the gravitational field red-shifts the frequency modes of the vacuum, a
condition on the... | [
{
"created": "Mon, 7 May 2001 14:03:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Altaie",
"M. B.",
""
]
] | In this paper we follow a new approach for particle creation by a localized strong gravitational field. The approach is based on a definition of the physical vacuum drawn from Heisenberg uncertainty principle. Using the fact that the gravitational field red-shifts the frequency modes of the vacuum, a condition on the m... |
0903.0143 | Luiz C L Botelho | Luiz C L Botelho | Light Deflection on de-Sitter Space | 9lho In order to protest against that stupid and ruthless decision of
arxiv moderation in not allow me to submit unplished articles in arxiv | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the light deflection on de-Sitter Space with negative cosmological
constant
| [
{
"created": "Sun, 1 Mar 2009 20:57:56 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2012 20:27:46 GMT",
"version": "v2"
}
] | 2012-07-04 | [
[
"Botelho",
"Luiz C L",
""
]
] | We study the light deflection on de-Sitter Space with negative cosmological constant |
gr-qc/0412113 | Ilya Lvovich Shapiro | D.F. Carneiro, E.A. Freiras, B. Gon\c{c}alves, A.G. de Lima, and I.L.
Shapiro (Universidade Federal de Juiz de Fora, MG, Brazil) | On Useful Conformal Tranformations In General Relativity | 17 pages, LaTeX. Several misprints and mistakes in formulas
corrected, one derivation simplified and one reference added | Grav.Cosmol. 10 (2004) 305-312 | null | DF-UFJF/2004-10 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Local conformal transformations are known as a useful tool in various
applications of the gravitational theory, especially in cosmology. We describe
some new aspects of these transformations, in particular using them for
derivation of Einstein equations for the cosmological and Schwarzschild
metrics. Furthermore, the... | [
{
"created": "Wed, 22 Dec 2004 12:34:12 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jun 2023 18:25:38 GMT",
"version": "v2"
}
] | 2023-06-05 | [
[
"Carneiro",
"D. F.",
"",
"Universidade Federal de Juiz de Fora, MG, Brazil"
],
[
"Freiras",
"E. A.",
"",
"Universidade Federal de Juiz de Fora, MG, Brazil"
],
[
"Gonçalves",
"B.",
"",
"Universidade Federal de Juiz de Fora, MG, Brazil"
],
[
"de Lima",... | Local conformal transformations are known as a useful tool in various applications of the gravitational theory, especially in cosmology. We describe some new aspects of these transformations, in particular using them for derivation of Einstein equations for the cosmological and Schwarzschild metrics. Furthermore, the c... |
2101.02223 | Jakub Bilski | Jakub Bilski | Lattice classical cosmology | 4 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article presents the lattice-smeared gravity phase space reduction
defined by the cosmological gauge-fixing conditions. These conditions are
specified to reduce the SU(2) symmetry and the spatial diffeomorphism
invariance of the loop quantum gravity's Fock space, known as the spin network.
The internal symmetry ... | [
{
"created": "Wed, 6 Jan 2021 19:00:11 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2021 20:53:34 GMT",
"version": "v2"
}
] | 2021-05-28 | [
[
"Bilski",
"Jakub",
""
]
] | This article presents the lattice-smeared gravity phase space reduction defined by the cosmological gauge-fixing conditions. These conditions are specified to reduce the SU(2) symmetry and the spatial diffeomorphism invariance of the loop quantum gravity's Fock space, known as the spin network. The internal symmetry is... |
2207.03474 | Boris Kruglikov | Boris Kruglikov, Wijnand Steneker | Killing Tensors in Koutras-McIntosh Spacetimes | null | null | 10.1088/1361-6382/ac9509 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Koutras-McIntosh family of metrics include conformally flat pp-waves and
the Wils metric. It appeared in a paper of 1996 by Koutras-McIntosh as an
example of a pure radiation spacetime without scalar curvature invariants or
infinitesimal symmetries. Here we demonstrate that these metrics have no
"hidden symmetrie... | [
{
"created": "Thu, 7 Jul 2022 17:55:57 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Kruglikov",
"Boris",
""
],
[
"Steneker",
"Wijnand",
""
]
] | The Koutras-McIntosh family of metrics include conformally flat pp-waves and the Wils metric. It appeared in a paper of 1996 by Koutras-McIntosh as an example of a pure radiation spacetime without scalar curvature invariants or infinitesimal symmetries. Here we demonstrate that these metrics have no "hidden symmetries"... |
0901.2400 | Lau Loi So | Lau Loi So and James M. Nester | New positive small vacuum region gravitational energy expressions | 4 pages | Phys.Rev.D79:084028,2009 | 10.1103/PhysRevD.79.084028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an infinite number of new holonomic quasi-local gravitational
energy-momentum density pseudotensors with good limits asymptotically and in
small regions, both materially and in vacuum. For small vacuum regions they are
all a positive multiple of the Bel-Robinson tensor and consequently have
positive ener... | [
{
"created": "Fri, 16 Jan 2009 06:15:31 GMT",
"version": "v1"
}
] | 2010-04-14 | [
[
"So",
"Lau Loi",
""
],
[
"Nester",
"James M.",
""
]
] | We construct an infinite number of new holonomic quasi-local gravitational energy-momentum density pseudotensors with good limits asymptotically and in small regions, both materially and in vacuum. For small vacuum regions they are all a positive multiple of the Bel-Robinson tensor and consequently have positive energy... |
1507.00901 | Ujjal Debnath | Ujjal Debnath | Entropy Bound of Horizons for Accelerating, Rotating and Charged
Plebanski-Demianski Black Hole | 6 pages | null | 10.1016/j.aop.2016.06.014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We first review the accelerating, rotating and charged Plebanski-Demianski
(PD) black hole, which includes the Kerr-Newman rotating black hole and the
Taub-NUT spacetime. The main feature of this black hole is that it has 4
horizons like event horizon, Cauchy horizon and two accelerating horizons. In
the non-extremal... | [
{
"created": "Thu, 2 Jul 2015 13:00:53 GMT",
"version": "v1"
}
] | 2016-08-03 | [
[
"Debnath",
"Ujjal",
""
]
] | We first review the accelerating, rotating and charged Plebanski-Demianski (PD) black hole, which includes the Kerr-Newman rotating black hole and the Taub-NUT spacetime. The main feature of this black hole is that it has 4 horizons like event horizon, Cauchy horizon and two accelerating horizons. In the non-extremal c... |
1806.01648 | Wolfgang Muschik | Wolfgang Muschik | Entropy Identity inducing Non-Equilibrium Thermodynamics of Relativistic
Multi-Component Systems and their Newtonian Limits | arXiv admin note: text overlap with arXiv:1701.04103 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-equilibrium and equilibrium thermodynamics of an interacting component in
a special-relativistic multi-component system is discussed by use of an entropy
identity. The special case of the corresponding free component is considered.
Equilibrium conditions and especially the multi-component Killing relation of
the ... | [
{
"created": "Sun, 3 Jun 2018 09:25:56 GMT",
"version": "v1"
}
] | 2018-06-06 | [
[
"Muschik",
"Wolfgang",
""
]
] | Non-equilibrium and equilibrium thermodynamics of an interacting component in a special-relativistic multi-component system is discussed by use of an entropy identity. The special case of the corresponding free component is considered. Equilibrium conditions and especially the multi-component Killing relation of the 4-... |
1612.05856 | Deng Wang | Deng Wang | Model-independent traversable wormholes from baryon acoustic
oscillations | Minor revision. Published in Physics of the Dark Universe | null | 10.1016/j.dark.2023.101306 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the model-independent traversable wormholes
from baryon acoustic oscillations. Firstly, we place the statistical
constraints on the average dark energy equation of state $\omega_{av}$ by only
using BAO data. Subsequently, two specific wormhole solutions are obtained,
i.e, the cases of th... | [
{
"created": "Sun, 18 Dec 2016 04:59:28 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2023 17:31:23 GMT",
"version": "v2"
}
] | 2023-08-07 | [
[
"Wang",
"Deng",
""
]
] | In this paper, we investigate the model-independent traversable wormholes from baryon acoustic oscillations. Firstly, we place the statistical constraints on the average dark energy equation of state $\omega_{av}$ by only using BAO data. Subsequently, two specific wormhole solutions are obtained, i.e, the cases of the ... |
0706.4413 | Mayeul Arminjon | Mayeul Arminjon | Quantum wave equations in curved space-time from wave mechanics | 3 pages in 12pt LaTeX. Text of a talk given at the conference
"Symmetry and Perturbation Theory", 2-9 June 2007, Otranto (Italy). Submitted
to the Proceedings (G. Gaeta and Raff. Vitolo, eds, World Scientific) | null | 10.1142/9789812776174_0031 | null | gr-qc | null | Alternative versions of the Klein-Gordon and Dirac equations in a curved
spacetime are got by applying directly the classical-quantum correspondence.
| [
{
"created": "Fri, 29 Jun 2007 14:00:36 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Arminjon",
"Mayeul",
""
]
] | Alternative versions of the Klein-Gordon and Dirac equations in a curved spacetime are got by applying directly the classical-quantum correspondence. |
2012.09245 | Vinicius Medeiros Gomes Da Silveira | V. M. G. Silveira, C. A. Z. Vasconcellos, E. G. S. Luna and D.
Hadjimichef | Matter-antimatter asymmetry and non-inertial effects | 15 pages, 1 table, 4 figures | J. High Energy Phys. 2021, 285 (2021) | 10.1007/JHEP03(2021)285 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate non-inertial effects on $CP$-violating processes using a
model, based on the framework of quantum field theory in curved spacetimes,
devised to account for the decay of accelerated particles. We show that the
$CP$ violation parameter for the decay of accelerated kaons into two pions
decreases very slig... | [
{
"created": "Wed, 16 Dec 2020 20:19:52 GMT",
"version": "v1"
}
] | 2021-04-13 | [
[
"Silveira",
"V. M. G.",
""
],
[
"Vasconcellos",
"C. A. Z.",
""
],
[
"Luna",
"E. G. S.",
""
],
[
"Hadjimichef",
"D.",
""
]
] | We investigate non-inertial effects on $CP$-violating processes using a model, based on the framework of quantum field theory in curved spacetimes, devised to account for the decay of accelerated particles. We show that the $CP$ violation parameter for the decay of accelerated kaons into two pions decreases very slight... |
2407.21380 | Azwar Sutiono | Azwar Sutiono, Agus Suroso, Freddy Permana Zen | Dynamical System Analysis Of Chameleon Mechanism in Brans-Dicke
Scalar-Tensor Model | 22 pages, 5 figures, Published in International Journal of
Theoretical Physics, Volume 63, article number 187, (2024) | Int. J. Theor. Phys. 63, 187 (2024) | 10.1007/s10773-024-05726-4 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigated the stability of the chameleon screening mechanism in the
Brans-Dicke scalar-tensor model. We define a constraint on the Brans-Dicke
parameter $\omega_{BD}^*$ identifying two stability groups,
$\omega_{BD}>\omega_{BD}^*$ and $0<\omega_{BD}<\omega_{BD}^*$. The first group
achieves stability with both a... | [
{
"created": "Wed, 31 Jul 2024 07:11:38 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Aug 2024 10:04:17 GMT",
"version": "v2"
}
] | 2024-08-06 | [
[
"Sutiono",
"Azwar",
""
],
[
"Suroso",
"Agus",
""
],
[
"Zen",
"Freddy Permana",
""
]
] | We investigated the stability of the chameleon screening mechanism in the Brans-Dicke scalar-tensor model. We define a constraint on the Brans-Dicke parameter $\omega_{BD}^*$ identifying two stability groups, $\omega_{BD}>\omega_{BD}^*$ and $0<\omega_{BD}<\omega_{BD}^*$. The first group achieves stability with both app... |
2106.07121 | James Quach Dr | Salman Sajad Wani, James Q. Quach, Mir Faizal | Time Fisher Information associated with Fluctuations in Quantum Geometry | 12 pages | Europhys. Lett. 139, 6, 62002 (2022) | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | As time is not an observable, we use Fisher information (FI) to address the
problem of time. We show that the Hamiltonian constraint operator cannot be
used to analyze any quantum process for quantum geometries that are associated
with time-reparametrization invariant classical geometries. This is because the
Hamilto... | [
{
"created": "Mon, 14 Jun 2021 00:56:41 GMT",
"version": "v1"
}
] | 2022-09-27 | [
[
"Wani",
"Salman Sajad",
""
],
[
"Quach",
"James Q.",
""
],
[
"Faizal",
"Mir",
""
]
] | As time is not an observable, we use Fisher information (FI) to address the problem of time. We show that the Hamiltonian constraint operator cannot be used to analyze any quantum process for quantum geometries that are associated with time-reparametrization invariant classical geometries. This is because the Hamiltoni... |
0910.1307 | Norman Cruz | Norman Cruz, Samuel Lepe, and Francisco Pena | The coincidence problem in the scenario of dark energy interacting with
two fluids | 14 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological model of dark energy interacting with dark matter and another
general component of the universe is considered. The evolution equations for
coincidence parameters r and s, which represent the ratios between the dark
energy and the matter and the other cosmic fluid, respectively, are analyzed in
terms of... | [
{
"created": "Wed, 7 Oct 2009 16:27:22 GMT",
"version": "v1"
}
] | 2009-10-08 | [
[
"Cruz",
"Norman",
""
],
[
"Lepe",
"Samuel",
""
],
[
"Pena",
"Francisco",
""
]
] | A cosmological model of dark energy interacting with dark matter and another general component of the universe is considered. The evolution equations for coincidence parameters r and s, which represent the ratios between the dark energy and the matter and the other cosmic fluid, respectively, are analyzed in terms of t... |
1003.2786 | Rong-Jia Yang | Xiang-Ting Gao and Rong-Jia Yang | Geometrical diagnostic for purely kinetic k-essence dark energy | 4 pages, 4 figures, to appear in PLB, minimal errors are corrected | Phys.Lett.B687:99-102,2010 | 10.1016/j.physletb.2010.03.047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geometrical diagnostic, involving the statefinder $\{r,s\}$ and $Om(x)$, is
widely used to discriminate different dark energy models. We apply the
statefinder $\{r,s\}$ and $Om(x)$ to purely kinetic k-essence dark energy model
with Dirac-Born-Infeld-like Lagrangian which can be considered as scalar field
realizations... | [
{
"created": "Sun, 14 Mar 2010 13:17:35 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Mar 2010 12:38:44 GMT",
"version": "v2"
}
] | 2010-04-30 | [
[
"Gao",
"Xiang-Ting",
""
],
[
"Yang",
"Rong-Jia",
""
]
] | Geometrical diagnostic, involving the statefinder $\{r,s\}$ and $Om(x)$, is widely used to discriminate different dark energy models. We apply the statefinder $\{r,s\}$ and $Om(x)$ to purely kinetic k-essence dark energy model with Dirac-Born-Infeld-like Lagrangian which can be considered as scalar field realizations o... |
1704.00388 | Stephen Adler | Stephen L. Adler | Implications of a frame dependent gravitational effective action for
perturbations on the Robertson-Walker Metric | Latex, 18 pages; v3 has typos corrected, revision of Sec. 5, added
Appendices D and E; v5 is final published version | International Journal of Modern Physics D 26 (2017) 1750159 | 10.1142/S0218271817501590 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In earlier work we showed that a frame dependent effective action motivated
by the postulates of three-space general coordinate invariance and Weyl scaling
invariance exactly mimics a cosmological constant in Robertson-Walker (RW)
spacetimes. Here we study the implications of this effective action for small
fluctuati... | [
{
"created": "Sun, 2 Apr 2017 23:33:24 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2017 21:15:12 GMT",
"version": "v2"
},
{
"created": "Wed, 31 May 2017 16:34:42 GMT",
"version": "v3"
},
{
"created": "Sat, 8 Jul 2017 17:59:24 GMT",
"version": "v4"
},
{
"cre... | 2018-01-10 | [
[
"Adler",
"Stephen L.",
""
]
] | In earlier work we showed that a frame dependent effective action motivated by the postulates of three-space general coordinate invariance and Weyl scaling invariance exactly mimics a cosmological constant in Robertson-Walker (RW) spacetimes. Here we study the implications of this effective action for small fluctuation... |
1203.5867 | Hongwei Yu | Wenting Zhou, Hongwei Yu | Spontaneous excitation of a static multilevel atom coupled with
electromagnetic vacuum fluctuations in Schwarzschild spacetime | 21 pages, no figures | Class. Quantum Grav. 29 (2012) 085003 | 10.1088/0264-9381/29/8/085003 | null | gr-qc physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spontaneous excitation of a radially polarized static multilevel
atom outside a spherically symmetric black hole in multi-polar interaction with
quantum electromagnetic fluctuations in the Boulware, Unruh and Hartle-Hawking
vacuum states. We find that spontaneous excitation does not occur in the
Boulware... | [
{
"created": "Tue, 27 Mar 2012 04:19:54 GMT",
"version": "v1"
}
] | 2012-03-28 | [
[
"Zhou",
"Wenting",
""
],
[
"Yu",
"Hongwei",
""
]
] | We study the spontaneous excitation of a radially polarized static multilevel atom outside a spherically symmetric black hole in multi-polar interaction with quantum electromagnetic fluctuations in the Boulware, Unruh and Hartle-Hawking vacuum states. We find that spontaneous excitation does not occur in the Boulware v... |
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