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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1505.06637 | Laszlo B. Szabados | L\'aszl\'o B Szabados, Paul Tod | A positive Bondi--type mass in asymptotically de Sitter spacetimes | 51 pages; typos corrected, one reference added; final version,
appearing in Class. Quantum Grav | null | 10.1088/0264-9381/32/20/205011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general structure of the conformal boundary $\mathscr{I}^+$ of
asymptotically de Sitter spacetimes is investigated. First we show that
Penrose's quasi-local mass, associated with a cut ${\cal S}$ of the conformal
boundary, can be zero even in the presence of outgoing gravitational radiation.
On the other hand, fo... | [
{
"created": "Mon, 25 May 2015 14:17:05 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2015 12:36:53 GMT",
"version": "v2"
}
] | 2015-10-07 | [
[
"Szabados",
"László B",
""
],
[
"Tod",
"Paul",
""
]
] | The general structure of the conformal boundary $\mathscr{I}^+$ of asymptotically de Sitter spacetimes is investigated. First we show that Penrose's quasi-local mass, associated with a cut ${\cal S}$ of the conformal boundary, can be zero even in the presence of outgoing gravitational radiation. On the other hand, foll... |
gr-qc/0506121 | H.-J. Schmidt | H.-J. Schmidt | Einsteins Arbeiten in Bezug auf die moderne Kosmologie | 19 pages, LaTeX, in German language, submitted for publication,
English language title: Einstein's papers in relation to modern cosmology | Acta Historica Astronomiae 27 (2005) 108-124 | null | null | gr-qc | null | We comment on the paper [1] by Albert Einstein from 1918 to Willem De
Sitter's solution [2] of the Einstein field equation from today's point of
view. To this end, we start by describing the geometry of the De Sitter
space-time and present its importance for the inflationary cosmological model.
| [
{
"created": "Sat, 25 Jun 2005 15:22:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmidt",
"H. -J.",
""
]
] | We comment on the paper [1] by Albert Einstein from 1918 to Willem De Sitter's solution [2] of the Einstein field equation from today's point of view. To this end, we start by describing the geometry of the De Sitter space-time and present its importance for the inflationary cosmological model. |
1110.4504 | V. M. Mostepanenko | V. B. Bezerra, V. M. Mostepanenko, H. F. Mota, and C. Romero | Thermal Casimir effect for neutrino and electromagnetic fields in closed
Friedmann cosmological model | 23 pages, to appear in Phys. Rev. D | null | 10.1103/PhysRevD.84.104025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the total internal energy, total energy density and pressure,
and the free energy for the neutrino and electromagnetic fields in Einstein and
closed Friedmann cosmological models. The Casimir contributions to all these
quantities are separated. The asymptotic expressions for both the total
internal energ... | [
{
"created": "Thu, 20 Oct 2011 11:51:10 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Bezerra",
"V. B.",
""
],
[
"Mostepanenko",
"V. M.",
""
],
[
"Mota",
"H. F.",
""
],
[
"Romero",
"C.",
""
]
] | We calculate the total internal energy, total energy density and pressure, and the free energy for the neutrino and electromagnetic fields in Einstein and closed Friedmann cosmological models. The Casimir contributions to all these quantities are separated. The asymptotic expressions for both the total internal energy ... |
0705.0284 | Claudio Dappiaggi | C. Dappiaggi (Pavia U.) | Projecting Massive Scalar Fields to Null Infinity | 26 pages | Ann. Henri Poincare 9 (2008), 35-63 | 10.1007/s00023-007-0349-1 | null | gr-qc hep-th math-ph math.MP | null | It is known that, in an asymptotically flat spacetime, null infinity cannot
act as an initial-value surface for massive real scalar fields. Exploiting
tools proper of harmonic analysis on hyperboloids and global norm estimates for
the wave operator, we show that it is possible to circumvent such obstruction
at least ... | [
{
"created": "Wed, 2 May 2007 13:11:14 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Dappiaggi",
"C.",
"",
"Pavia U."
]
] | It is known that, in an asymptotically flat spacetime, null infinity cannot act as an initial-value surface for massive real scalar fields. Exploiting tools proper of harmonic analysis on hyperboloids and global norm estimates for the wave operator, we show that it is possible to circumvent such obstruction at least in... |
2405.10777 | Amitabh Virmani | Harsh, Sk Jahanur Hoque, Sitender Pratap Kashyap, Amitabh Virmani | de Sitter Teukolsky waves | 45 pages, 2 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present de Sitter Teukolsky waves -- linearised quadrupolar gravitational
waves in the transverse-traceless gauge in de Sitter spacetime. In the
cosmological constant $\Lambda$ going to zero limit, our solutions match to
Teukolsky solutions. For non-zero $\Lambda$, we compare our solutions to the
wider literature,... | [
{
"created": "Fri, 17 May 2024 13:38:49 GMT",
"version": "v1"
}
] | 2024-05-20 | [
[
"Harsh",
"",
""
],
[
"Hoque",
"Sk Jahanur",
""
],
[
"Kashyap",
"Sitender Pratap",
""
],
[
"Virmani",
"Amitabh",
""
]
] | We present de Sitter Teukolsky waves -- linearised quadrupolar gravitational waves in the transverse-traceless gauge in de Sitter spacetime. In the cosmological constant $\Lambda$ going to zero limit, our solutions match to Teukolsky solutions. For non-zero $\Lambda$, we compare our solutions to the wider literature, w... |
1003.4385 | Jose Luis Flores | J.L. Flores, S. Haesen, M. Ortega | New Examples of Marginally Trapped Surfaces and Tubes in Warped
Spacetimes | 20 pages | null | 10.1088/0264-9381/27/14/145021 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we provide new examples of marginally trapped surfaces
and tubes in FLRW spacetimes by using a basic relation between these objects
and CMC surfaces in 3-manifolds. We also provide a new method to construct
marginally trapped surfaces in closed FLRW spacetimes, which is based on the
classical Hop... | [
{
"created": "Tue, 23 Mar 2010 11:46:10 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Flores",
"J. L.",
""
],
[
"Haesen",
"S.",
""
],
[
"Ortega",
"M.",
""
]
] | In the present paper we provide new examples of marginally trapped surfaces and tubes in FLRW spacetimes by using a basic relation between these objects and CMC surfaces in 3-manifolds. We also provide a new method to construct marginally trapped surfaces in closed FLRW spacetimes, which is based on the classical Hopf ... |
2407.10421 | Hong-Hao Zhang | Jian Ge, Lei Ming, Shi-Dong Liang, Hong-Hao Zhang, Tiberiu Harko | Constraining Weyl type f(Q,T) gravity with Big Bang Nucleosynthesis | 19 pages, 12 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Weyl type $f(Q,T)$ modified gravity theory is an extension of the $f(Q)$
and $f(Q,T)$ type theories, where $T$ is the trace of the matter
energy-momentum tensor, and the scalar non-metricity $Q$ is represented in its
standard Weyl form, and it is fully determined by a vector field $\omega _\mu$.
The theory can gi... | [
{
"created": "Mon, 15 Jul 2024 03:52:00 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Ge",
"Jian",
""
],
[
"Ming",
"Lei",
""
],
[
"Liang",
"Shi-Dong",
""
],
[
"Zhang",
"Hong-Hao",
""
],
[
"Harko",
"Tiberiu",
""
]
] | The Weyl type $f(Q,T)$ modified gravity theory is an extension of the $f(Q)$ and $f(Q,T)$ type theories, where $T$ is the trace of the matter energy-momentum tensor, and the scalar non-metricity $Q$ is represented in its standard Weyl form, and it is fully determined by a vector field $\omega _\mu$. The theory can give... |
2007.15300 | Pankaj Sheoran | Ricardo Becerril, Susana Valdez -Alvarado, Ulises Nucamendi, Pankaj
Sheoran, Manuel D\'avila | Mass parameter and the bounds on redshifts and blueshifts of photons
emitted from geodesic particle orbiting in the vicinity of regular black
holes | 23 pages, 19 figures, Major revision, title and context changed, App.
A added, new figures added, updated to match journal version | Phys. Rev. D 103, 084054 (2021) | 10.1103/PhysRevD.103.084054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the mass parameter for a class of static and spherically symmetric
regular black holes (BHs) (namely Bardeen, Hayward and
Ay\'{o}n-Beato-Garc\'{i}a BHs) which are solutions of Einstein's field
equations coupled to nonlinear electrodynamics (NED) in terms of redshifts and
blueshifts of photons emitted by geo... | [
{
"created": "Thu, 30 Jul 2020 08:25:05 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jun 2021 15:29:14 GMT",
"version": "v2"
}
] | 2021-06-07 | [
[
"Becerril",
"Ricardo",
""
],
[
"-Alvarado",
"Susana Valdez",
""
],
[
"Nucamendi",
"Ulises",
""
],
[
"Sheoran",
"Pankaj",
""
],
[
"Dávila",
"Manuel",
""
]
] | We obtain the mass parameter for a class of static and spherically symmetric regular black holes (BHs) (namely Bardeen, Hayward and Ay\'{o}n-Beato-Garc\'{i}a BHs) which are solutions of Einstein's field equations coupled to nonlinear electrodynamics (NED) in terms of redshifts and blueshifts of photons emitted by geode... |
0707.1475 | Alfonso Garc\'ia-Parrado G\'omez-Lobo Dr. | Alfonso Garc\'ia-Parrado G\'omez-Lobo | Dynamical laws of superenergy in General Relativity | 27 pages, no figures. Typos corrected, section 9 suppressed and more
acknowledgments added. To appear in Classical and Quantum Gravity | Class.Quant.Grav.25:015006,2008 | 10.1088/0264-9381/25/1/015006 | null | gr-qc | null | The Bel and Bel-Robinson tensors were introduced nearly fifty years ago in an
attempt to generalize to gravitation the energy-momentum tensor of
electromagnetism. This generalization was successful from the mathematical
point of view because these tensors share mathematical properties which are
remarkably similar to ... | [
{
"created": "Tue, 10 Jul 2007 15:42:29 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Nov 2007 13:56:58 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gómez-Lobo",
"Alfonso García-Parrado",
""
]
] | The Bel and Bel-Robinson tensors were introduced nearly fifty years ago in an attempt to generalize to gravitation the energy-momentum tensor of electromagnetism. This generalization was successful from the mathematical point of view because these tensors share mathematical properties which are remarkably similar to th... |
1001.1141 | James Burnett | Christian. G. Boehmer and James Burnett | Dark Spinors | 3 pages, 2 figures, submitted to the Proceedings of the Twelfth
Marcel Grossmann Meeting on General Relativity; minor corrections | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article will provide the reader with a short introduction to dark
spinors, which are ELKO spinors, eingenspinors of the charge conjugation
operator, applied to dark matter and dark energy.
| [
{
"created": "Thu, 7 Jan 2010 20:58:54 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Feb 2010 12:37:43 GMT",
"version": "v2"
}
] | 2010-02-06 | [
[
"Boehmer",
"Christian. G.",
""
],
[
"Burnett",
"James",
""
]
] | This article will provide the reader with a short introduction to dark spinors, which are ELKO spinors, eingenspinors of the charge conjugation operator, applied to dark matter and dark energy. |
1302.5163 | V. G. Gurzadyan | I.Ciufolini, V.G.Gurzadyan, R.Penrose, A.Paolozzi | Geodesic motion in General Relativity: LARES in Earth's gravity | 4 pages, 1 image | in: Low Dimensional Physics and Gauge Principles, Matinyan
Festschrift, p.93, World Scientific, 2013 | 10.1142/9789814440349_0008 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to General Relativity, as distinct from Newtonian gravity, motion
under gravity is treated by a theory that deals, initially, only with test
particles. At the same time, satellite measurements deal with extended bodies.
We discuss the correspondence between geodesic motion in General Relativity and
the moti... | [
{
"created": "Thu, 21 Feb 2013 02:57:25 GMT",
"version": "v1"
}
] | 2017-10-03 | [
[
"Ciufolini",
"I.",
""
],
[
"Gurzadyan",
"V. G.",
""
],
[
"Penrose",
"R.",
""
],
[
"Paolozzi",
"A.",
""
]
] | According to General Relativity, as distinct from Newtonian gravity, motion under gravity is treated by a theory that deals, initially, only with test particles. At the same time, satellite measurements deal with extended bodies. We discuss the correspondence between geodesic motion in General Relativity and the motion... |
1712.02699 | Katharina Radermacher | Katharina Radermacher | Orthogonal Bianchi B stiff fluids close to the initial singularity | 29 pages, v2: minor typos, layout changes | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our previous article [Rad16], we investigated the asymptotic behaviour of
orthogonal Bianchi class B perfect fluids close to the initial singularity and
proved the Strong Cosmic Censorship conjecture in this setting. In several of
the statements, the case of a stiff fluid had to be excluded. The present paper
fill... | [
{
"created": "Thu, 7 Dec 2017 16:31:40 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Dec 2017 21:38:11 GMT",
"version": "v2"
}
] | 2017-12-13 | [
[
"Radermacher",
"Katharina",
""
]
] | In our previous article [Rad16], we investigated the asymptotic behaviour of orthogonal Bianchi class B perfect fluids close to the initial singularity and proved the Strong Cosmic Censorship conjecture in this setting. In several of the statements, the case of a stiff fluid had to be excluded. The present paper fills ... |
gr-qc/0702112 | Kayll Lake | Kayll Lake | Scalar Polynomial Singularities in Power-Law Spacetimes | 7 pages revtex4 two figures extended discussion | Gen.Rel.Grav.40:1609-1617,2008 | 10.1007/s10714-007-0563-7 | null | gr-qc | null | Recently, Helliwell and Konkowski (\texttt{gr-qc/0701149}) have examined the
quantum "healing" of some classical singularities in certain power-law
spacetimes. Here I further examine classical properties of these spacetimes and
show that some of them contain naked strong curvature singularities.
| [
{
"created": "Tue, 20 Feb 2007 19:27:58 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2007 18:22:35 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lake",
"Kayll",
""
]
] | Recently, Helliwell and Konkowski (\texttt{gr-qc/0701149}) have examined the quantum "healing" of some classical singularities in certain power-law spacetimes. Here I further examine classical properties of these spacetimes and show that some of them contain naked strong curvature singularities. |
gr-qc/0301127 | Florian Siebel | Florian Siebel (MPA), Jose A. Font (Valencia), Ewald Mueller (MPA),
Philippos Papadopoulos (Portsmouth) | Axisymmetric core collapse simulations using characteristic numerical
relativity | 17 pages, 18 figures, submitted to Phys. Rev. D | Phys.Rev. D67 (2003) 124018 | 10.1103/PhysRevD.67.124018 | null | gr-qc astro-ph | null | We present results from axisymmetric stellar core collapse simulations in
general relativity. Our hydrodynamics code has proved robust and accurate
enough to allow for a detailed analysis of the global dynamics of the collapse.
Contrary to traditional approaches based on the 3+1 formulation of the
gravitational field... | [
{
"created": "Fri, 31 Jan 2003 08:34:18 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Siebel",
"Florian",
"",
"MPA"
],
[
"Font",
"Jose A.",
"",
"Valencia"
],
[
"Mueller",
"Ewald",
"",
"MPA"
],
[
"Papadopoulos",
"Philippos",
"",
"Portsmouth"
]
] | We present results from axisymmetric stellar core collapse simulations in general relativity. Our hydrodynamics code has proved robust and accurate enough to allow for a detailed analysis of the global dynamics of the collapse. Contrary to traditional approaches based on the 3+1 formulation of the gravitational field e... |
1512.08349 | Er-Dong Guo | Er-Dong Guo, Miao Li, and Jia-Rui Sun | CFT dual of charged AdS black hole in the large dimension limit | Latex, 18 pages, minor corrections and references added | null | 10.1142/S0218271816500851 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dual CFT description of the $d+1$-dimensional
Reissner-Nordstr\"om-Anti de Sitter (RN-AdS$_{d+1}$) black hole in the large
dimension (large $d$) limit, both for the extremal and nonextremal cases. The
central charge of the dual CFT$_2$ (or chiral CFT$_1$) is calculated for the
near horizon near extremal ... | [
{
"created": "Mon, 28 Dec 2015 08:57:12 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2016 14:36:47 GMT",
"version": "v2"
}
] | 2016-06-15 | [
[
"Guo",
"Er-Dong",
""
],
[
"Li",
"Miao",
""
],
[
"Sun",
"Jia-Rui",
""
]
] | We study the dual CFT description of the $d+1$-dimensional Reissner-Nordstr\"om-Anti de Sitter (RN-AdS$_{d+1}$) black hole in the large dimension (large $d$) limit, both for the extremal and nonextremal cases. The central charge of the dual CFT$_2$ (or chiral CFT$_1$) is calculated for the near horizon near extremal ge... |
1903.01436 | Peter Horvathy | P.-M. Zhang, M. Cariglia, M. Elbistan, G. W. Gibbons, P. A. Horvathy | "Kepler Harmonies" and conformal symmetries | 13 pages, 1 figure. Dedicated to the memory of Christian Duval
(1947-2018) | null | 10.1016/j.physletb.2019.03.057 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kepler's rescaling becomes, when "Eisenhart-Duval lifted" to $5$-dimensional
"Bargmann" gravitational wave spacetime, an ordinary spacetime symmetry for
motion along null geodesics, which are the lifts of Keplerian trajectories. The
lifted rescaling generates a well-behaved conserved Noether charge upstairs,
which ta... | [
{
"created": "Mon, 4 Mar 2019 18:58:01 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Mar 2019 18:37:25 GMT",
"version": "v2"
}
] | 2019-05-22 | [
[
"Zhang",
"P. -M.",
""
],
[
"Cariglia",
"M.",
""
],
[
"Elbistan",
"M.",
""
],
[
"Gibbons",
"G. W.",
""
],
[
"Horvathy",
"P. A.",
""
]
] | Kepler's rescaling becomes, when "Eisenhart-Duval lifted" to $5$-dimensional "Bargmann" gravitational wave spacetime, an ordinary spacetime symmetry for motion along null geodesics, which are the lifts of Keplerian trajectories. The lifted rescaling generates a well-behaved conserved Noether charge upstairs, which take... |
gr-qc/9901082 | Takahiro Tanaka | Takahiro Tanaka | The No-Negative Mode Theorem in False Vacuum Decay with Gravity | 14 pages, 8 postscript figures, added references, corrected some
typos | Nucl.Phys. B556 (1999) 373-396 | 10.1016/S0550-3213(99)00369-7 | OU-TAP 92 | gr-qc | null | The so-called negative mode problem in the path integral approach to the
false vacuum decay with the effect of gravity has been an unsolved problem.
Several years ago, we proposed a conjecture which is to be proved in order to
give a consistent solution to the negative mode problem. We called it the
``no-negative mod... | [
{
"created": "Thu, 28 Jan 1999 17:45:44 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 1999 12:35:42 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Tanaka",
"Takahiro",
""
]
] | The so-called negative mode problem in the path integral approach to the false vacuum decay with the effect of gravity has been an unsolved problem. Several years ago, we proposed a conjecture which is to be proved in order to give a consistent solution to the negative mode problem. We called it the ``no-negative mode ... |
2110.12813 | Mohammed Khalil | Mohammed Khalil | Gravitational spin-orbit dynamics at the fifth-and-a-half post-Newtonian
order | 19 pages, 1 figure, ancillary file. v2: minor improvements, matches
published version | null | 10.1103/PhysRevD.104.124015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurate waveform models are crucial for gravitational-wave data analysis,
and since spin has a significant effect on the binary dynamics, it is important
to improve the spin description in these models. In this paper, we derive the
spin-orbit (SO) coupling at the fifth-and-a-half post-Newtonian (5.5PN) order.
The me... | [
{
"created": "Mon, 25 Oct 2021 11:23:28 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Nov 2021 14:09:22 GMT",
"version": "v2"
}
] | 2021-12-15 | [
[
"Khalil",
"Mohammed",
""
]
] | Accurate waveform models are crucial for gravitational-wave data analysis, and since spin has a significant effect on the binary dynamics, it is important to improve the spin description in these models. In this paper, we derive the spin-orbit (SO) coupling at the fifth-and-a-half post-Newtonian (5.5PN) order. The meth... |
0901.2353 | Ramin G. Daghigh | Ramin G. Daghigh | The Highly Real Quasinormal Modes of Schwarzschild-Anti De Sitter Black
Holes | 9 pages, 1 figure | JHEP 0904:045,2009 | 10.1088/1126-6708/2009/04/045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent investigation has led to the possibility of the existence of an
interesting region of the asymptotic quasinormal mode spectrum of
Schwarzschild-anti de Sitter black holes. In this asymptotic region, the real
part of quasinormal mode frequencies approaches infinity while the damping rate
approaches a finite v... | [
{
"created": "Thu, 15 Jan 2009 21:41:37 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2009 03:25:55 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Apr 2009 14:06:29 GMT",
"version": "v3"
}
] | 2010-04-14 | [
[
"Daghigh",
"Ramin G.",
""
]
] | A recent investigation has led to the possibility of the existence of an interesting region of the asymptotic quasinormal mode spectrum of Schwarzschild-anti de Sitter black holes. In this asymptotic region, the real part of quasinormal mode frequencies approaches infinity while the damping rate approaches a finite val... |
1612.04235 | Frans Klinkhamer | F.R. Klinkhamer, G.E. Volovik | More on cold dark matter from q-theory | 8 pages, v3: minor changes, references updated | null | null | KA-TP-40-2016 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the rapidly-oscillating part of a $q$-field in a cosmological
context and find that its energy density behaves in the same way as a
cold-dark-matter component, namely proportional to the inverse cube of the
cosmic scale factor.
| [
{
"created": "Mon, 12 Dec 2016 15:46:57 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2016 13:36:43 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Nov 2018 14:40:14 GMT",
"version": "v3"
}
] | 2018-11-14 | [
[
"Klinkhamer",
"F. R.",
""
],
[
"Volovik",
"G. E.",
""
]
] | We consider the rapidly-oscillating part of a $q$-field in a cosmological context and find that its energy density behaves in the same way as a cold-dark-matter component, namely proportional to the inverse cube of the cosmic scale factor. |
1408.1105 | David Kubiznak | Aruna Rajagopal, David Kubiznak, Robert B. Mann | Van der Waals black hole | 4 pages, 1 figure v3: corrected statements about energy conditions | null | 10.1016/j.physletb.2014.08.054 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of extended phase space, where the negative cosmological
constant is treated as a thermodynamic pressure in the first law of black hole
thermodynamics, we find an asymptotically AdS metric whose thermodynamics
matches exactly that of the Van der Waals fluid. However, we show that as a
solution of Einst... | [
{
"created": "Tue, 5 Aug 2014 20:10:16 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2014 19:30:55 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Nov 2014 14:17:52 GMT",
"version": "v3"
}
] | 2015-06-22 | [
[
"Rajagopal",
"Aruna",
""
],
[
"Kubiznak",
"David",
""
],
[
"Mann",
"Robert B.",
""
]
] | In the context of extended phase space, where the negative cosmological constant is treated as a thermodynamic pressure in the first law of black hole thermodynamics, we find an asymptotically AdS metric whose thermodynamics matches exactly that of the Van der Waals fluid. However, we show that as a solution of Einstei... |
1905.04602 | Celia Escamilla-Rivera | Celia Escamilla-Rivera and Salvatore Capozziello | Unveiling cosmography from the dark energy equation of state | 9 pages, 3 figures, 2 tables. Observational data analysis added.
Accepted for publication in IJMPD | International Journal of Modern Physics D (2019) | 10.1142/S0218271819501542 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Constraining the dark energy equation of state, $w_x(z)$, is one of the main
issues of current and future cosmological surveys. In practice, this requires
making assumptions about the evolution of $w_x$ with redshift $z$, which can be
manifested in a choice of a specific parametric form where the number of
cosmologic... | [
{
"created": "Sat, 11 May 2019 22:39:39 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Jul 2019 06:32:33 GMT",
"version": "v2"
}
] | 2019-07-29 | [
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | Constraining the dark energy equation of state, $w_x(z)$, is one of the main issues of current and future cosmological surveys. In practice, this requires making assumptions about the evolution of $w_x$ with redshift $z$, which can be manifested in a choice of a specific parametric form where the number of cosmological... |
gr-qc/9806008 | Sharon Morsink | Sharon M. Morsink, Nikolaos Stergioulas and Steve R. Blattnig | Quasi-normal modes of rotating relativistic stars - neutral modes for
realistic equations of state | 12 pages, 5 figures, submitted to ApJ | Astrophys.J.510:854-861,1999 | 10.1086/306630 | WISC-MILW-98-TH-19 | gr-qc astro-ph | null | We compute zero-frequency (neutral) quasi-normal f-modes of fully
relativistic and rapidly rotating neutron stars, using several realistic
equations of state (EOSs) for neutron star matter. The zero-frequency modes
signal the onset of the gravitational radiation-driven instability. We find
that the l=m=2 (bar) f-mode... | [
{
"created": "Mon, 1 Jun 1998 15:19:20 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Morsink",
"Sharon M.",
""
],
[
"Stergioulas",
"Nikolaos",
""
],
[
"Blattnig",
"Steve R.",
""
]
] | We compute zero-frequency (neutral) quasi-normal f-modes of fully relativistic and rapidly rotating neutron stars, using several realistic equations of state (EOSs) for neutron star matter. The zero-frequency modes signal the onset of the gravitational radiation-driven instability. We find that the l=m=2 (bar) f-mode i... |
gr-qc/9603014 | Giovanni Amelino | G. Amelino-Camelia | Limits on the Measurability of Space-time Distances in (the
Semi-classical Approximation of) Quantum Gravity | 9 pages, LaTex. (This paper precedes and is cited in the paper ``On
Local Observations in Quantum Gravity'', gr-qc/9603013) | Mod.Phys.Lett. A9 (1994) 3415-3422 | 10.1142/S0217732394003245 | INFN-NA-94/35 | gr-qc | null | By taking into account both quantum mechanical and general relativistic
effects, I derive an equation that describes some limitations on the
measurability of space-time distances. I then discuss possible features of
quantum gravity which are suggested by this equation.
| [
{
"created": "Mon, 11 Mar 1996 13:01:14 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Amelino-Camelia",
"G.",
""
]
] | By taking into account both quantum mechanical and general relativistic effects, I derive an equation that describes some limitations on the measurability of space-time distances. I then discuss possible features of quantum gravity which are suggested by this equation. |
0803.2377 | Shun-Pei Miao | Shun-Pei Miao and R. P. Woodard | A Simple Operator Check of the Effective Fermion Mode Function during
Inflation | 39 pages, no figuire.(1) New version has clarified the ultimate
motivation by adding sentences to the abstract and to the penultimate
paragraph of the introduction. (2) By combining a number of references and
equations we have managed to reduce the length by 2 pages | Class.Quant.Grav.25:145009,2008 | 10.1088/0264-9381/25/14/145009 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a relatively simple operator formalism which reproduces the
leading infrared logarithm of the one loop quantum gravitational correction to
the fermion mode function on a locally de Sitter background. This rule may
serve as the basis for an eventual stochastic formulation of quantum gravity
during inflation... | [
{
"created": "Sun, 16 Mar 2008 23:45:25 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 2008 14:21:20 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Miao",
"Shun-Pei",
""
],
[
"Woodard",
"R. P.",
""
]
] | We present a relatively simple operator formalism which reproduces the leading infrared logarithm of the one loop quantum gravitational correction to the fermion mode function on a locally de Sitter background. This rule may serve as the basis for an eventual stochastic formulation of quantum gravity during inflation. ... |
1303.0232 | Sante Carloni Dr | Francesco Biscani and Sante Carloni | A first-order secular theory for the post-Newtonian two-body problem
with spin -- I: The restricted case | 14 pages, 3 figures, Published in MNRAS | MNRAS (January 21, 2013) 428 (3): 2295-2310 | 10.1093/mnras/sts198 | null | gr-qc astro-ph.EP math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the relativistic restricted two-body problem with spin employing a
perturbation scheme based on Lie series. Starting from a post-Newtonian
expansion of the field equations, we develop a first-order secular theory that
reproduces well-known relativistic effects such as the precession of the
pericentre and t... | [
{
"created": "Fri, 1 Mar 2013 17:47:35 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Mar 2013 11:21:22 GMT",
"version": "v2"
}
] | 2013-03-14 | [
[
"Biscani",
"Francesco",
""
],
[
"Carloni",
"Sante",
""
]
] | We revisit the relativistic restricted two-body problem with spin employing a perturbation scheme based on Lie series. Starting from a post-Newtonian expansion of the field equations, we develop a first-order secular theory that reproduces well-known relativistic effects such as the precession of the pericentre and the... |
1007.0554 | Guoying Chee | Guoying Chee | Stability of de Sitter solutions sourced by dark spinors | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmology of ELKO and Lorentz Invariant NSS has been investigated using
dynamical system method starting from the proposal of Boehmer et al
[arXiv:1003.3858]. Some different results have been obtained by a different
approach. The exact solutions described by fixed points of the dynamical system
and their stability ha... | [
{
"created": "Sun, 4 Jul 2010 14:24:19 GMT",
"version": "v1"
}
] | 2010-07-06 | [
[
"Chee",
"Guoying",
""
]
] | Cosmology of ELKO and Lorentz Invariant NSS has been investigated using dynamical system method starting from the proposal of Boehmer et al [arXiv:1003.3858]. Some different results have been obtained by a different approach. The exact solutions described by fixed points of the dynamical system and their stability have... |
2103.06329 | Jos\'e Villanueva | Mohsen Fathi, Samuel Lepe and J.R. Villanueva | Adiabatic analysis of the rotating BTZ black hole | Accepted version | Eur. Phys. J. C 81 (2021) 6, 499 | 10.1140/epjc/s10052-021-09302-6 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we analyze some interesting features of the thermodynamics of
the rotating BTZ black hole from the Carath\'{e}odory axiomatic postulate, for
which, we exploit the appropriate Pfaffian form. The allowed adiabatic
transformations are then obtained by solving the corresponding Cauchy problem,
and are studi... | [
{
"created": "Wed, 10 Mar 2021 20:18:35 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jul 2021 20:08:07 GMT",
"version": "v2"
}
] | 2021-08-03 | [
[
"Fathi",
"Mohsen",
""
],
[
"Lepe",
"Samuel",
""
],
[
"Villanueva",
"J. R.",
""
]
] | In this paper we analyze some interesting features of the thermodynamics of the rotating BTZ black hole from the Carath\'{e}odory axiomatic postulate, for which, we exploit the appropriate Pfaffian form. The allowed adiabatic transformations are then obtained by solving the corresponding Cauchy problem, and are studied... |
gr-qc/0501012 | Mauro Bologna | J. C. Flores and M. Bologna | Anderson's localization in a random metric: applications to cosmology | 10 pages | null | null | null | gr-qc | null | It is considered an equation for the Lyapunov exponent $% \gamma $ in a
random metric for a scalar propagating wave field. At first order in frequency
this equation is solved explicitly. The localization length $L_{c}$ (reciprocal
of Re($\gamma $)) is obtained as function of the metric-fluctuation-distance
$\Delta R$... | [
{
"created": "Wed, 5 Jan 2005 18:49:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Flores",
"J. C.",
""
],
[
"Bologna",
"M.",
""
]
] | It is considered an equation for the Lyapunov exponent $% \gamma $ in a random metric for a scalar propagating wave field. At first order in frequency this equation is solved explicitly. The localization length $L_{c}$ (reciprocal of Re($\gamma $)) is obtained as function of the metric-fluctuation-distance $\Delta R$ (... |
2204.04010 | Mu-Tao Wang | Po-Ning Chen, Mu-Tao Wang, Ye-Kai Wang, and Shing-Tung Yau | Conserved quantities in general relativity -- the view from null
infinity | Contribution to the book in honor of Elliott Lieb's 90th birthday.
arXiv admin note: substantial text overlap with arXiv:2010.14059,
arXiv:2003.07732 | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity, an idealized distant observer is situated at future
null infinity where light rays emitted from the source approach. This article
concerns conserved quantities such as mass, energy-momentum, angular momentum,
and center of mass at future null infinity. The classical definitions of Bondi
mass at... | [
{
"created": "Fri, 8 Apr 2022 11:40:23 GMT",
"version": "v1"
}
] | 2022-04-11 | [
[
"Chen",
"Po-Ning",
""
],
[
"Wang",
"Mu-Tao",
""
],
[
"Wang",
"Ye-Kai",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | In general relativity, an idealized distant observer is situated at future null infinity where light rays emitted from the source approach. This article concerns conserved quantities such as mass, energy-momentum, angular momentum, and center of mass at future null infinity. The classical definitions of Bondi mass at f... |
gr-qc/9712072 | Haret Rosu | H.C. Rosu | Cosmological Levinson theorem | one LaTex page | Nuovo Cim. B114 (1999) 113-114 | null | null | gr-qc | null | If at least some Wheeler-DeWitt solutions can be interpreted as zero-energy
resonances then the total s-wave cross section of the corresponding quantum
universes is infinite
| [
{
"created": "Tue, 16 Dec 1997 22:41:04 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 1999 16:07:50 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rosu",
"H. C.",
""
]
] | If at least some Wheeler-DeWitt solutions can be interpreted as zero-energy resonances then the total s-wave cross section of the corresponding quantum universes is infinite |
2304.04984 | Ram Brustein | Ram Brustein, A.J.M. Medved, Tom Shindelman | Defrosting frozen stars: spectrum of internal fluid modes | 36 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The frozen star model provides a classical description of a regularized black
hole and is based upon the idea that regularizing the singularity requires
deviations from the Schwarzschild geometry which extend over horizon-sized
scales, as well as maximally negative radial pressure as an equation of state.
The frozen ... | [
{
"created": "Tue, 11 Apr 2023 05:00:38 GMT",
"version": "v1"
}
] | 2023-04-12 | [
[
"Brustein",
"Ram",
""
],
[
"Medved",
"A. J. M.",
""
],
[
"Shindelman",
"Tom",
""
]
] | The frozen star model provides a classical description of a regularized black hole and is based upon the idea that regularizing the singularity requires deviations from the Schwarzschild geometry which extend over horizon-sized scales, as well as maximally negative radial pressure as an equation of state. The frozen st... |
gr-qc/9904062 | David P. Rideout | D. P. Rideout and R. D. Sorkin | A Classical Sequential Growth Dynamics for Causal Sets | 28 pages, 9 figures, LaTeX, added references and a footnote, minor
corrections | Phys.Rev.D61:024002,2000 | 10.1103/PhysRevD.61.024002 | SU-GP-99/4-1 | gr-qc hep-th | null | Starting from certain causality conditions and a discrete form of general
covariance, we derive a very general family of classically stochastic,
sequential growth dynamics for causal sets. The resulting theories provide a
relatively accessible ``half way house'' to full quantum gravity that possibly
contains the latt... | [
{
"created": "Sun, 25 Apr 1999 05:11:09 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Aug 1999 16:46:07 GMT",
"version": "v2"
},
{
"created": "Sat, 26 Jun 2004 21:18:06 GMT",
"version": "v3"
}
] | 2011-05-05 | [
[
"Rideout",
"D. P.",
""
],
[
"Sorkin",
"R. D.",
""
]
] | Starting from certain causality conditions and a discrete form of general covariance, we derive a very general family of classically stochastic, sequential growth dynamics for causal sets. The resulting theories provide a relatively accessible ``half way house'' to full quantum gravity that possibly contains the latter... |
gr-qc/9903049 | Ali Shojai Baghini | Fatimah Shojai and Ali Shojai and Mehdi Golshani | Conformal Transformations and Quantum Gravity | 8 pages, RevTex | Mod.Phys.Lett. A13 (1998) 2725-2729 | 10.1142/S0217732398002898 | null | gr-qc | null | Recently\cite{BQG}, it was shown that quantum effects of matter could be
identified with the conformal degree of freedom of the space-time metric.
Accordingly, one can introduce quantum effects either by making a scale
transformation (i.e. changing the metric), or by making a conformal
transformation (i.e. changing a... | [
{
"created": "Sat, 13 Mar 1999 13:10:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Shojai",
"Fatimah",
""
],
[
"Shojai",
"Ali",
""
],
[
"Golshani",
"Mehdi",
""
]
] | Recently\cite{BQG}, it was shown that quantum effects of matter could be identified with the conformal degree of freedom of the space-time metric. Accordingly, one can introduce quantum effects either by making a scale transformation (i.e. changing the metric), or by making a conformal transformation (i.e. changing all... |
1911.01809 | Daniele Gregoris | Daniele Gregoris, Yen Chin Ong, Bin Wang | The Horizon of the McVittie Black Hole: On the Role of the Cosmic Fluid
Modeling | Matches published version | Eur. Phys. J. C (2020) 80:159 | 10.1140/epjc/s10052-020-7707-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the existence and time evolution of the
cosmological and event horizons in a McVittie universe whose expansion is
driven by the Redlich-Kwong, (Modified) Berthelot, Dieterici, and Peng-Robinson
fluids, respectively. The equations of state of these fluids are rich enough to
account for bo... | [
{
"created": "Tue, 5 Nov 2019 14:37:20 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2020 18:18:46 GMT",
"version": "v2"
}
] | 2020-03-03 | [
[
"Gregoris",
"Daniele",
""
],
[
"Ong",
"Yen Chin",
""
],
[
"Wang",
"Bin",
""
]
] | In this paper, we investigate the existence and time evolution of the cosmological and event horizons in a McVittie universe whose expansion is driven by the Redlich-Kwong, (Modified) Berthelot, Dieterici, and Peng-Robinson fluids, respectively. The equations of state of these fluids are rich enough to account for both... |
gr-qc/9910075 | Wladimir Belayev | W. B. Belayev | Cosmological model in 5D: Stationarity, yes or no | 1 figure, 1 table, revised version of gr-qc/9903016, some types,
references on part numbers, one column, Earth rotation | null | null | CMS-99-10 | gr-qc astro-ph | null | The tired-light cosmology is considered in the framework of Kaluza-Klein
theory in 5D. The solution of the five-dimensional semi-classical Einstein
equations with nonzero five-dimensional energy-momentum tensor gives density of
matter in the Universe well conformed to the observations. Variation of the
light velocity... | [
{
"created": "Fri, 22 Oct 1999 15:15:14 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 1999 11:33:40 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Oct 1999 15:13:45 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Oct 1999 06:19:39 GMT",
"version": "v4"
},
{
"c... | 2007-05-23 | [
[
"Belayev",
"W. B.",
""
]
] | The tired-light cosmology is considered in the framework of Kaluza-Klein theory in 5D. The solution of the five-dimensional semi-classical Einstein equations with nonzero five-dimensional energy-momentum tensor gives density of matter in the Universe well conformed to the observations. Variation of the light velocity a... |
gr-qc/9310028 | Dadhich | S.Mukherjee and N.K.Dadhich | Inhomogenous Chaotic Inflation | 12pages, Normal Tex | null | null | null | gr-qc | null | A chaotic model of the early universe within the framework of the
singularity-free solutions of Einstein's equation is suggested. The evolution
of our universe at its early stage, starting out as a small domain of the
parent universe, is governed by the dynamics of a classical scalar field $\phi$
. If in any such dom... | [
{
"created": "Wed, 20 Oct 1993 17:44:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mukherjee",
"S.",
""
],
[
"Dadhich",
"N. K.",
""
]
] | A chaotic model of the early universe within the framework of the singularity-free solutions of Einstein's equation is suggested. The evolution of our universe at its early stage, starting out as a small domain of the parent universe, is governed by the dynamics of a classical scalar field $\phi$ . If in any such domai... |
1807.05871 | Salomeh Khoeini-Moghaddam | Salomeh Khoeini-Moghaddam, Farzan Momeni, Fatemeh Yousefabadi | Fermionic Tachyons as a Source of Dark Energy | 5 figures | New Astronomy 100 (2023) 101986 | 10.1016/j.newast.2022.101986 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model for the universe on the basis of a self interacting fermionic tachyon
field is investigated here. It is shown that, devising a self interaction
potential of a proper form, the fermionic tachyon field is capable of producing
an accelerating expansion that at late time tends to a constant value which is
in cons... | [
{
"created": "Fri, 13 Jul 2018 08:46:33 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jun 2019 18:12:33 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Feb 2023 06:46:59 GMT",
"version": "v3"
}
] | 2023-03-29 | [
[
"Khoeini-Moghaddam",
"Salomeh",
""
],
[
"Momeni",
"Farzan",
""
],
[
"Yousefabadi",
"Fatemeh",
""
]
] | A model for the universe on the basis of a self interacting fermionic tachyon field is investigated here. It is shown that, devising a self interaction potential of a proper form, the fermionic tachyon field is capable of producing an accelerating expansion that at late time tends to a constant value which is in consis... |
1512.08490 | Korumilli Sravan Kumar | K. Sravan Kumar, Jo\~ao Marto, Paulo Vargas Moniz, Suratna Das | Gravitational waves in $\alpha-$attractors | 6 pages, 2 figures. Contribution to the proceedings of "The
Fourtheenth Marcel Grossmann Meeting on General Relativity", University of
Rome "La Sapienza", Rome, July 12-18, 2015, based on a talk delivered at the
ST4 parallel session | World Scientific, December 2017, The Fourteenth Marcel Grossmann
Meeting: pp. 4262-4267 | 10.1142/9789813226609_0571 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study inflation in the $\alpha-$attractor model under a non-slow-roll
dynamics with an ansatz proposed by Gong \& Sasaki \cite{Gong:2015ypa} of
assuming $N=N\left(\phi\right)$. Under this approach, we construct a class of
local shapes of inflaton potential that are different from the T-models. We
find this type of... | [
{
"created": "Mon, 28 Dec 2015 19:51:29 GMT",
"version": "v1"
}
] | 2017-11-21 | [
[
"Kumar",
"K. Sravan",
""
],
[
"Marto",
"João",
""
],
[
"Moniz",
"Paulo Vargas",
""
],
[
"Das",
"Suratna",
""
]
] | We study inflation in the $\alpha-$attractor model under a non-slow-roll dynamics with an ansatz proposed by Gong \& Sasaki \cite{Gong:2015ypa} of assuming $N=N\left(\phi\right)$. Under this approach, we construct a class of local shapes of inflaton potential that are different from the T-models. We find this type of i... |
gr-qc/0102022 | Vitorio A. De Lorenci | V. A. De Lorenci and M. A. Souza (EFEI - Itajuba') | Electromagnetic wave propagation inside a material medium: an effective
geometry interpretation | REVTeX file, 6 pages. Version to appear in Phys. Lett. B | Phys.Lett. B512 (2001) 417-422 | 10.1016/S0370-2693(01)00588-3 | null | gr-qc | null | We present a method developed to deal with electromagnetic wave propagation
inside a material medium that reacts, in general, non-linearly to the field
strength. We work in the context of Maxwell' s theory in the low frequency
limit and obtain a geometrical representation of light paths for each case
presented. The i... | [
{
"created": "Tue, 6 Feb 2001 13:51:52 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2001 17:43:06 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"De Lorenci",
"V. A.",
"",
"EFEI - Itajuba'"
],
[
"Souza",
"M. A.",
"",
"EFEI - Itajuba'"
]
] | We present a method developed to deal with electromagnetic wave propagation inside a material medium that reacts, in general, non-linearly to the field strength. We work in the context of Maxwell' s theory in the low frequency limit and obtain a geometrical representation of light paths for each case presented. The iso... |
gr-qc/0605068 | Subenoy Chakraborty | Tanwi Bandyopadhyay, Subenoy Chakraborty | Collapsing Inhomogeneous Dust Fluid in the Background of Dark Energy | 10 Pages, no figure | null | null | null | gr-qc | null | In the present work, gravitational collapse of an inhomogeneous spherical
star model, consisting of inhomogeneous dust fluid (dark matter) in the
background of dark energy is considered. The collapsing process is examined
first separately for both dark matter and dark energy and then under the
combined effect of dark... | [
{
"created": "Thu, 11 May 2006 12:02:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bandyopadhyay",
"Tanwi",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In the present work, gravitational collapse of an inhomogeneous spherical star model, consisting of inhomogeneous dust fluid (dark matter) in the background of dark energy is considered. The collapsing process is examined first separately for both dark matter and dark energy and then under the combined effect of dark m... |
1710.06768 | Vakif K Onemli | G. Karakaya, V. K. Onemli | Quantum Effects of Mass on Scalar Field Correlations and Fluctuations
during Inflation | 50 pages, 4 figures | Phys. Rev. D 97, 123531 (2018) | 10.1103/PhysRevD.97.123531 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an infrared truncated massive minimally coupled scalar field with
a quartic self-interaction in the locally de Sitter background of an inflating
universe. We compute the two-point correlation function of the scalar and the
mean squared fluctuations (variance) of the field variation analytically, at
tree, ... | [
{
"created": "Wed, 18 Oct 2017 15:08:02 GMT",
"version": "v1"
}
] | 2018-06-27 | [
[
"Karakaya",
"G.",
""
],
[
"Onemli",
"V. K.",
""
]
] | We consider an infrared truncated massive minimally coupled scalar field with a quartic self-interaction in the locally de Sitter background of an inflating universe. We compute the two-point correlation function of the scalar and the mean squared fluctuations (variance) of the field variation analytically, at tree, on... |
gr-qc/9801065 | Conceicao Bento | M.C. Bento, O. Bertolami and N.J. Nunes (Departamento de Fisica,
Instituto Superior Tecnico, Lisbon, Portugal) | Primordial Density Fluctuations in a Dual Supergravity Cosmology | 13 pages, Latex, 3 figures (uses epsf.sty) | Phys.Lett. B427 (1998) 261-266 | 10.1016/S0370-2693(98)00218-4 | DF/IST-6.97 | gr-qc | null | We analyse the spectrum of energy density fluctuations of a dual supergravity
model where the dilaton and the moduli are stabilized and sucessful inflation
is achieved inside domain walls that separate different vacua of the theory.
Constraints on the parameters of the superpotential are derived from the
amplitude of... | [
{
"created": "Tue, 20 Jan 1998 17:02:46 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bento",
"M. C.",
"",
"Departamento de Fisica,\n Instituto Superior Tecnico, Lisbon, Portugal"
],
[
"Bertolami",
"O.",
"",
"Departamento de Fisica,\n Instituto Superior Tecnico, Lisbon, Portugal"
],
[
"Nunes",
"N. J.",
"",
"Departamento de Fisica,\n Insti... | We analyse the spectrum of energy density fluctuations of a dual supergravity model where the dilaton and the moduli are stabilized and sucessful inflation is achieved inside domain walls that separate different vacua of the theory. Constraints on the parameters of the superpotential are derived from the amplitude of t... |
2309.13651 | Cristian Stelea | Cristian Stelea, Marina-Aura Dariescu and Ciprian Dariescu | Charged black holes with dark halos | 14 pages, 3 figures. v2. Matches the published version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Cardoso et al. constructed an exact solution of Einstein's
equations that describes a supermassive black hole immersed into a dark matter
halo. In this work use a solution-generating technique, which is a direct
generalization of some of the Ehlers-Harrison transformation in the Ehlers
formalism in order to... | [
{
"created": "Sun, 24 Sep 2023 14:34:21 GMT",
"version": "v1"
},
{
"created": "Sun, 12 May 2024 11:16:56 GMT",
"version": "v2"
}
] | 2024-05-14 | [
[
"Stelea",
"Cristian",
""
],
[
"Dariescu",
"Marina-Aura",
""
],
[
"Dariescu",
"Ciprian",
""
]
] | Recently, Cardoso et al. constructed an exact solution of Einstein's equations that describes a supermassive black hole immersed into a dark matter halo. In this work use a solution-generating technique, which is a direct generalization of some of the Ehlers-Harrison transformation in the Ehlers formalism in order to c... |
0707.0452 | Eyo Ita III | Eyo Eyo Ita III | Instanton representation of Plebanski gravity: IX. Hamiltonian
minisuperspace dynamics in undensitized momentum space variables | 18 pages. Background material for revised journal article | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we illustrate the dynamics of the instanton representation in
the description of vacuum GR in minisuperspace for undensitized variables. We
uncover a new class of general solutions in both the degenerate and the
nondegenerate sectors of the theory. Additionally, the individual sectors are
preserved unde... | [
{
"created": "Tue, 3 Jul 2007 15:59:38 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Apr 2008 19:25:25 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Apr 2008 08:28:44 GMT",
"version": "v3"
},
{
"created": "Fri, 31 Jul 2009 08:24:29 GMT",
"version": "v4"
},
{
"crea... | 2010-04-23 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] | In this paper we illustrate the dynamics of the instanton representation in the description of vacuum GR in minisuperspace for undensitized variables. We uncover a new class of general solutions in both the degenerate and the nondegenerate sectors of the theory. Additionally, the individual sectors are preserved under ... |
2207.02224 | Zachary Nasipak | Zachary Nasipak | Adiabatic evolution due to the conservative scalar self-force during
orbital resonances | 30 pages, 6 figures, 3 tables; Updated to reflect published version | Phys. Rev. D 106, 064042 (2022) | 10.1103/PhysRevD.106.064042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the scalar self-force experienced by a scalar point-charge
orbiting a Kerr black hole along $r\theta$-resonant geodesics. We use the
self-force to calculate the averaged rate of change of the charge's orbital
energy $\langle\dot{E}\rangle$, angular momentum $\langle\dot{L}_z\rangle$, and
Carter constant ... | [
{
"created": "Tue, 5 Jul 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Sep 2022 20:03:40 GMT",
"version": "v2"
}
] | 2022-09-27 | [
[
"Nasipak",
"Zachary",
""
]
] | We calculate the scalar self-force experienced by a scalar point-charge orbiting a Kerr black hole along $r\theta$-resonant geodesics. We use the self-force to calculate the averaged rate of change of the charge's orbital energy $\langle\dot{E}\rangle$, angular momentum $\langle\dot{L}_z\rangle$, and Carter constant $\... |
gr-qc/0508048 | Christian Fronsdal | Christian Fronsdal | Growth of a Black Hole | 12 pages, 2 figures, TeX file | J.Geom.Phys. 57 (2006) 167-176 | 10.1016/j.geomphys.2006.02.008 | null | gr-qc hep-th | null | This paper studies the interpretation of physics near a Schwarzschild black
hole. A scenario for creation and growth is proposed that avoids the conundrum
of information loss. In this picture the horizon recedes as it is approached
and has no physical reality. Radiation is likely to occur, but it cannot be
predicted.... | [
{
"created": "Thu, 11 Aug 2005 13:23:06 GMT",
"version": "v1"
}
] | 2014-05-27 | [
[
"Fronsdal",
"Christian",
""
]
] | This paper studies the interpretation of physics near a Schwarzschild black hole. A scenario for creation and growth is proposed that avoids the conundrum of information loss. In this picture the horizon recedes as it is approached and has no physical reality. Radiation is likely to occur, but it cannot be predicted. |
gr-qc/0110124 | Shinji Tsujikawa | Shinji Tsujikawa (Univ. of Tokyo) | Density perturbations in the Ekpyrotic Universe and string-inspired
generalizations | 5 pages, 3 figures, some discussions and references are added | Phys.Lett. B526 (2002) 179-185 | 10.1016/S0370-2693(01)01526-X | null | gr-qc astro-ph hep-ph hep-th | null | We study density perturbations in several cosmological models motivated by
string theory. The evolution and the spectra of curvature perturbations ${\cal
R}$ are analyzed in the Ekpyrotic scenario and nonsingular string cosmologies.
We find that these string-inspired models generally exhibit blue spectra in
contrast ... | [
{
"created": "Wed, 31 Oct 2001 06:26:32 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Dec 2001 05:11:47 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Tsujikawa",
"Shinji",
"",
"Univ. of Tokyo"
]
] | We study density perturbations in several cosmological models motivated by string theory. The evolution and the spectra of curvature perturbations ${\cal R}$ are analyzed in the Ekpyrotic scenario and nonsingular string cosmologies. We find that these string-inspired models generally exhibit blue spectra in contrast to... |
1503.05005 | Jose Geraldo Pereira | A. Araujo, H. Jennen, J. G. Pereira, A. C. Sampson, L. L. Savi | On the spacetime connecting two aeons in conformal cyclic cosmology | 15 pages. V2: presentation changes aiming at clarifying the text,
matches published version | Gen. Relativ. Grav. 47 (2015) 151 (17 pages) | 10.1007/s10714-015-1991-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As quotient spaces, Minkowski and de Sitter are fundamental,
non-gravitational spacetimes for the construction of physical theories. When
general relativity is constructed on a de Sitter spacetime, the usual
Riemannian structure is replaced by a more general structure called de
Sitter-Cartan geometry. In the contract... | [
{
"created": "Tue, 17 Mar 2015 11:48:05 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 2015 09:52:26 GMT",
"version": "v2"
}
] | 2015-11-18 | [
[
"Araujo",
"A.",
""
],
[
"Jennen",
"H.",
""
],
[
"Pereira",
"J. G.",
""
],
[
"Sampson",
"A. C.",
""
],
[
"Savi",
"L. L.",
""
]
] | As quotient spaces, Minkowski and de Sitter are fundamental, non-gravitational spacetimes for the construction of physical theories. When general relativity is constructed on a de Sitter spacetime, the usual Riemannian structure is replaced by a more general structure called de Sitter-Cartan geometry. In the contractio... |
0801.3425 | Leonid Verozub V | Leonid V. Verozub | Geodesic-invariant equations of gravitation | Latex, 24 pages with 5 figures | AnnalenPhys.17:28-51,2008 | 10.1002/andp.200710278 | null | gr-qc astro-ph math-ph math.MP | null | Einstein's equations of gravitation are not invariant under geodesic
mappings, i. e. under a certain class of mappings of the Christoffel symbols
and the metric tensor which leave the geodesic equations in a given coordinate
system invariant. A theory in which geodesic mappings play the role of gauge
transformations ... | [
{
"created": "Tue, 22 Jan 2008 18:28:19 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jan 2008 22:52:41 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Feb 2008 20:35:36 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Verozub",
"Leonid V.",
""
]
] | Einstein's equations of gravitation are not invariant under geodesic mappings, i. e. under a certain class of mappings of the Christoffel symbols and the metric tensor which leave the geodesic equations in a given coordinate system invariant. A theory in which geodesic mappings play the role of gauge transformations is... |
1908.09582 | Michael Maziashvili | Michael Maziashvili | Salecker-Wigner-Karolyhazy Gedankenexperiment in light of the
self-gravity | 11 pages | General Relativity and Gravitation 52, 70 (2020) | 10.1007/s10714-020-02722-x | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Gedankenexperiment mentioned in the title, the imprecision in space-time
measurement is related to the spreading of clock's wave-function with the
passage of time required for the measurement. Special relativity puts a bound
on the measurement time, it cannot be reduced arbitrarily as the signal used
for the measu... | [
{
"created": "Mon, 26 Aug 2019 10:26:27 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Maziashvili",
"Michael",
""
]
] | In Gedankenexperiment mentioned in the title, the imprecision in space-time measurement is related to the spreading of clock's wave-function with the passage of time required for the measurement. Special relativity puts a bound on the measurement time, it cannot be reduced arbitrarily as the signal used for the measure... |
1812.10679 | Claus Kiefer | Claus Kiefer | Space and Time 62 Years after the Berne Conference | 15 pages, 4 figures, contribution to the conference: Thinking about
Space and Time: 100 Years of Applying and Interpreting General Relativity,
Berne, Switzerland, September 12-14, 2017, v2: minor changes, v3: again minor
changes, final version | null | null | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1955, an international conference took place in Berne at which the state
of relativity theory and its possible generalizations were presented and
critically discussed. I review the most important contributions to that
conference and put them into the perspective of today's knowledge about the
nature of space and t... | [
{
"created": "Thu, 27 Dec 2018 10:02:52 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2019 14:49:47 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Aug 2020 14:24:36 GMT",
"version": "v3"
}
] | 2020-09-01 | [
[
"Kiefer",
"Claus",
""
]
] | In 1955, an international conference took place in Berne at which the state of relativity theory and its possible generalizations were presented and critically discussed. I review the most important contributions to that conference and put them into the perspective of today's knowledge about the nature of space and tim... |
2008.08301 | Shao-Wen Wei | Run Zhou, Yu-Xiao Liu, Shao-Wen Wei | Phase transition and microstructures of five-dimensional charged
Gauss-Bonnet-AdS black holes in the grand canonical ensemble | 16 pages and 8 figures | null | 10.1103/PhysRevD.102.124015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the small-large black hole phase transition and
construct the Ruppeiner geometry for the five-dimensional charged
Gauss-Bonnet-AdS black hole in the grand canonical ensemble. By making use of
the equal area law, we obtain the analytical coexistence curve of the small and
large black holes. The... | [
{
"created": "Wed, 19 Aug 2020 07:18:52 GMT",
"version": "v1"
}
] | 2020-12-09 | [
[
"Zhou",
"Run",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Wei",
"Shao-Wen",
""
]
] | In this paper, we study the small-large black hole phase transition and construct the Ruppeiner geometry for the five-dimensional charged Gauss-Bonnet-AdS black hole in the grand canonical ensemble. By making use of the equal area law, we obtain the analytical coexistence curve of the small and large black holes. Then ... |
2009.05187 | Qing-Yu Cai | Dongshan He and Qing-yu Cai | Wheeler-DeWitt equation rejects quantum effects of grown-up universes as
a candidate for dark energy | Any comments are welcome! | Phys. Lett. B 809, 135747 (2020) | 10.1016/j.physletb.2020.135747 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the changes of quantum effects of a growing universe
by using Wheeler-DeWitt equation (WDWE) together with de Broglie-Bohm quantum
trajectory approach. From WDWE, we obtain the quantum modified Friedmann
equations which have additional terms called quantum potential compared to
standard Friedm... | [
{
"created": "Fri, 11 Sep 2020 01:18:16 GMT",
"version": "v1"
}
] | 2020-09-14 | [
[
"He",
"Dongshan",
""
],
[
"Cai",
"Qing-yu",
""
]
] | In this paper, we study the changes of quantum effects of a growing universe by using Wheeler-DeWitt equation (WDWE) together with de Broglie-Bohm quantum trajectory approach. From WDWE, we obtain the quantum modified Friedmann equations which have additional terms called quantum potential compared to standard Friedman... |
1506.08649 | Murli Manohar Verma Dr. | Murli Manohar Verma and Bal Krishna Yadav | Dynamics of $f(R)$ gravity models and asymmetry of time | 10 pages, 9 figures | International Journal of Modern Physics D, 27(2), 1850002,(2018) | 10.1142/S0218271818500025 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We solve the field equations of modified gravity for $f(R)$ model in metric
formalism. Further, we obtain the fixed points of the dynamical system in phase
space analysis of $f(R)$ models, both with and without the effects of
radiation. Stability of these points is studied against perturbations in a
smooth spatial ba... | [
{
"created": "Sat, 13 Jun 2015 10:38:14 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Jul 2017 11:01:04 GMT",
"version": "v2"
}
] | 2018-01-26 | [
[
"Verma",
"Murli Manohar",
""
],
[
"Yadav",
"Bal Krishna",
""
]
] | We solve the field equations of modified gravity for $f(R)$ model in metric formalism. Further, we obtain the fixed points of the dynamical system in phase space analysis of $f(R)$ models, both with and without the effects of radiation. Stability of these points is studied against perturbations in a smooth spatial back... |
1311.0735 | Peter Hogan | C. Barrab\`es and P. A. Hogan | Collision of Shock Waves in Einstein-Maxwell Theory with a Cosmological
Constant: A Special Solution | Latex file, 7 pages | Physical Review D88, 087501 (2013) | 10.1103/PhysRevD.88.087501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Post-collision space-times of the Cartesian product form M'xM'', where M' and
M'' are two-dimensional manifolds, are known with M' and M'' having constant
curvatures of equal and opposite sign (for the collision of electromagnetic
shock waves) or of the same sign (for the collision of gravitational shock
waves). We c... | [
{
"created": "Mon, 4 Nov 2013 15:42:27 GMT",
"version": "v1"
}
] | 2013-11-05 | [
[
"Barrabès",
"C.",
""
],
[
"Hogan",
"P. A.",
""
]
] | Post-collision space-times of the Cartesian product form M'xM'', where M' and M'' are two-dimensional manifolds, are known with M' and M'' having constant curvatures of equal and opposite sign (for the collision of electromagnetic shock waves) or of the same sign (for the collision of gravitational shock waves). We con... |
gr-qc/9401025 | null | Norman Cruz, Cristi\'an Mart\'inez and Leda Pe\~na | Geodesic Structure of the 2 + 1 Black Hole | 13 pages, RevTex 3.0, 7 figures (available upon request). Submitted
to Phys. Rev. D | Class.Quant.Grav.11:2731-2740,1994 | 10.1088/0264-9381/11/11/014 | null | gr-qc | null | Null and timelike geodesics around a 2+1 black hole are determined. Complete
geodesics of both types exist in the rotating black-hole background, but not in
the spinless case. Upper and lower bounds for the radial size of the orbits are
given in all cases and the possibility of passing from one black hole exterior
sp... | [
{
"created": "Tue, 25 Jan 1994 17:02:48 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Cruz",
"Norman",
""
],
[
"Martínez",
"Cristián",
""
],
[
"Peña",
"Leda",
""
]
] | Null and timelike geodesics around a 2+1 black hole are determined. Complete geodesics of both types exist in the rotating black-hole background, but not in the spinless case. Upper and lower bounds for the radial size of the orbits are given in all cases and the possibility of passing from one black hole exterior spac... |
gr-qc/9510061 | null | G. Giachetta and G.Sardanashvily | Stress-Energy-Momentum Tensors in Lagrangian Field Theory. Part 1.
Superpotentials | 49 pp, LaTeX file | null | null | MPH/CAM/103/95 | gr-qc dg-ga hep-th math.DG | null | Differential conservation laws in Lagrangian field theory are usually related
to symmetries of a Lagrangian density and are obtained if the Lie derivative of
a Lagrangian density by a certain class of vector fields on a fiber bundle
vanishes. However, only two field models meet this property in fact. In gauge
theory ... | [
{
"created": "Mon, 30 Oct 1995 16:39:17 GMT",
"version": "v1"
}
] | 2008-02-03 | [
[
"Giachetta",
"G.",
""
],
[
"Sardanashvily",
"G.",
""
]
] | Differential conservation laws in Lagrangian field theory are usually related to symmetries of a Lagrangian density and are obtained if the Lie derivative of a Lagrangian density by a certain class of vector fields on a fiber bundle vanishes. However, only two field models meet this property in fact. In gauge theory of... |
gr-qc/9802027 | Arlen Anderson | Yvonne Choquet-Bruhat, James W. York, Jr., and Arlen Anderson | Curvature-based Hyperbolic Systems for General Relativity | 15 pp., LaTeX, to appear in the Proceedings of the Eighth Marcel
Grossmann Meeting on General Relativity, further citations added | null | null | IFP-UNC-523, TAR-UNC-065 | gr-qc | null | We review curvature-based hyperbolic forms of the evolution part of the
Cauchy problem of General Relativity that we have obtained recently. We
emphasize first order symmetrizable hyperbolic systems possessing only physical
characteristics.
| [
{
"created": "Thu, 12 Feb 1998 17:29:38 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Feb 1998 20:00:14 GMT",
"version": "v2"
}
] | 2012-08-27 | [
[
"Choquet-Bruhat",
"Yvonne",
""
],
[
"York,",
"James W.",
"Jr."
],
[
"Anderson",
"Arlen",
""
]
] | We review curvature-based hyperbolic forms of the evolution part of the Cauchy problem of General Relativity that we have obtained recently. We emphasize first order symmetrizable hyperbolic systems possessing only physical characteristics. |
0711.3641 | J. E. Horvath | Daniel C. Guariento, J. E. Horvath, P. S. Cust\'odio and J. A. de
Freitas Pacheco | Evolution of Primordial Black Holes in a radiation and phantom energy
environment | 6 pp, 2 figs., to appear in GRG | Gen.Rel.Grav.40:1593-1602,2008 | 10.1007/s10714-007-0562-8 | null | gr-qc | null | In this work we extend previous work on the evolution of a Primordial Black
Hole (PBH) to address the presence of a dark energy component with a
super-negative equation of state as a background, investigating the competition
between the radiation accretion, the Hawking evaporation and the phantom
accretion, the latte... | [
{
"created": "Thu, 22 Nov 2007 19:52:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Guariento",
"Daniel C.",
""
],
[
"Horvath",
"J. E.",
""
],
[
"Custódio",
"P. S.",
""
],
[
"Pacheco",
"J. A. de Freitas",
""
]
] | In this work we extend previous work on the evolution of a Primordial Black Hole (PBH) to address the presence of a dark energy component with a super-negative equation of state as a background, investigating the competition between the radiation accretion, the Hawking evaporation and the phantom accretion, the latter ... |
0909.2159 | Kazuharu Bamba | Kazuharu Bamba, Chao-Qiang Geng, and Shinji Tsujikawa | Equilibrium thermodynamics in modified gravitational theories | 11 pages, 2 figures, version to appear in Physics Letters B, typos
corrected | Phys.Lett.B688:101-109,2010 | 10.1016/j.physletb.2010.03.070 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that it is possible to obtain a picture of equilibrium thermodynamics
on the apparent horizon in the expanding cosmological background for a wide
class of modified gravity theories with the Lagrangian density $f(R, \phi, X)$,
where $R$ is the Ricci scalar and $X$ is the kinetic energy of a scalar field
$\phi$... | [
{
"created": "Fri, 11 Sep 2009 12:53:02 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Mar 2010 16:10:38 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Apr 2010 04:41:54 GMT",
"version": "v3"
}
] | 2010-10-12 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Geng",
"Chao-Qiang",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We show that it is possible to obtain a picture of equilibrium thermodynamics on the apparent horizon in the expanding cosmological background for a wide class of modified gravity theories with the Lagrangian density $f(R, \phi, X)$, where $R$ is the Ricci scalar and $X$ is the kinetic energy of a scalar field $\phi$. ... |
gr-qc/0006027 | Gabriel Catren | Gabriel Catren, Rafael Ferraro | Quantization of the Taub cosmological model with extrinsic time | 17 pages, no figures; authors' names corrected | Phys.Rev. D63 (2001) 023502 | 10.1103/PhysRevD.63.023502 | null | gr-qc | null | The paper addresses the quantization of minisuperspace cosmological models,
with application to the Taub Model. By desparametrizing the model with an
extrinsic time, a formalism is developed in order to define a conserved
Schr\"{o}dinger inner product in the space of solutions of the Wheeler-De Witt
equation. A quant... | [
{
"created": "Wed, 7 Jun 2000 15:40:34 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2000 20:01:40 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Catren",
"Gabriel",
""
],
[
"Ferraro",
"Rafael",
""
]
] | The paper addresses the quantization of minisuperspace cosmological models, with application to the Taub Model. By desparametrizing the model with an extrinsic time, a formalism is developed in order to define a conserved Schr\"{o}dinger inner product in the space of solutions of the Wheeler-De Witt equation. A quantum... |
gr-qc/9911030 | Alejandro Jakubi | Luis P. Chimento, Alejandro S. Jakubi and Diego Pavon | Quintessence inhomogeneous cosmology | 8 pages, LaTeX 2.09. To appear in Proceedings of ERE-99 | null | null | null | gr-qc | null | The Einstein-Klein-Gordon field equations are solved in a inhomogeneous
shear-free universe containing a material fluid, a self-interacting scalar
field, a variable cosmological term, and a heat flux. A quintessence-dominated
scenario arises with a power-law accelerated expansion compatible with the
currently observe... | [
{
"created": "Tue, 9 Nov 1999 00:48:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chimento",
"Luis P.",
""
],
[
"Jakubi",
"Alejandro S.",
""
],
[
"Pavon",
"Diego",
""
]
] | The Einstein-Klein-Gordon field equations are solved in a inhomogeneous shear-free universe containing a material fluid, a self-interacting scalar field, a variable cosmological term, and a heat flux. A quintessence-dominated scenario arises with a power-law accelerated expansion compatible with the currently observed ... |
gr-qc/9412026 | L. Hannibal | Ludger Hannibal | Dirac Theory in Space-Time without Torsion | 8 pp, LaTeX | null | null | OL-PHYS-TH2-12/94-1 | gr-qc | null | It is proven that the usual quadratic general-covariant Lagrangian for the
Dirac field leads to a symmetric, divergence-free energy-momentum tensor in the
standard Riemannian framework of space-time without torsion, provided the
tetrad field components are the only quantities related to gravitation that are
varied in... | [
{
"created": "Thu, 8 Dec 1994 17:19:15 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Dec 1994 09:33:29 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Hannibal",
"Ludger",
""
]
] | It is proven that the usual quadratic general-covariant Lagrangian for the Dirac field leads to a symmetric, divergence-free energy-momentum tensor in the standard Riemannian framework of space-time without torsion, provided the tetrad field components are the only quantities related to gravitation that are varied inde... |
0905.3762 | Marek Nowakowski | M. Nowakowski, I. Arraut | The Minimum and Maximum Temperature of Black Body Radiation | 7 pages, 1 figure | Mod.Phys.Lett.A24:2133-2137,2009 | 10.1142/S0217732309030679 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show, in different ways, that in the ubiquitous phenomenon of black body
radiation there exists a minimum and maximum temperature. These limiting values
are so small and large respectively, that they are of no practical use, except
in an extreme situation of black hole evaporation where they lead to maximum
and mi... | [
{
"created": "Fri, 22 May 2009 21:16:12 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Nowakowski",
"M.",
""
],
[
"Arraut",
"I.",
""
]
] | We show, in different ways, that in the ubiquitous phenomenon of black body radiation there exists a minimum and maximum temperature. These limiting values are so small and large respectively, that they are of no practical use, except in an extreme situation of black hole evaporation where they lead to maximum and mini... |
1111.1148 | Thomas L. Wilson | Thomas L. Wilson | A New Strategy For Solving Two Cosmological Problems in Hadron Physics | 19 pages, 2 figures, 1 table | Journal of Modern Physics 4, No. 5 (2013) 686 | 10.4236/jmp.2013.45096 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new approach to solving two of the cosmological problems (CCPs) is proposed
by introducing the Abbott-Deser (AD) method for defining Killing charges in
asymptotic de Sitter space as the only consistent means for defining the
ground-state vacuum for the CCP. That granted, Einstein gravity will also need
to be modifi... | [
{
"created": "Fri, 4 Nov 2011 15:11:24 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Dec 2011 16:42:49 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Mar 2013 18:00:49 GMT",
"version": "v3"
}
] | 2013-05-31 | [
[
"Wilson",
"Thomas L.",
""
]
] | A new approach to solving two of the cosmological problems (CCPs) is proposed by introducing the Abbott-Deser (AD) method for defining Killing charges in asymptotic de Sitter space as the only consistent means for defining the ground-state vacuum for the CCP. That granted, Einstein gravity will also need to be modified... |
gr-qc/0412030 | Giovanni Montani | Giovanni Montani | Geometrization of the Gauge Connection within a Kaluza-Klein Theory | 10 pages, no figure, to appear on Int. Journ. Theor. Phys | Int.J.Theor.Phys. 44 (2005) 43-52 | 10.1007/s10773-005-1435-0 | null | gr-qc | null | Within the framework of a Kaluza-Klein theory, we provide the geometrization
of a generic (Abelian and non-Abelian) gauge coupling, which comes out by
choosing a suitable matter fields dependence on the extra-coordinates.
We start by the extension of the Nother theorem to a multidimensional
spacetime being the dire... | [
{
"created": "Tue, 7 Dec 2004 11:57:07 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Montani",
"Giovanni",
""
]
] | Within the framework of a Kaluza-Klein theory, we provide the geometrization of a generic (Abelian and non-Abelian) gauge coupling, which comes out by choosing a suitable matter fields dependence on the extra-coordinates. We start by the extension of the Nother theorem to a multidimensional spacetime being the direct s... |
1911.07837 | Barak Shoshany | Barak Shoshany | Spin Networks and Cosmic Strings in 3+1 Dimensions | 70 pages, 3 figures; updated to version published in Classical and
Quantum Gravity | Class. Quantum Grav. 37 (2020) 085019 | 10.1088/1361-6382/ab778e | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin networks, the quantum states of discrete geometry in loop quantum
gravity, are directed graphs whose links are labeled by irreducible
representations of SU(2), or spins. Cosmic strings are 1-dimensional
topological defects carrying distributional curvature in an otherwise flat
spacetime. In this paper we prove t... | [
{
"created": "Mon, 18 Nov 2019 18:58:29 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2020 19:35:27 GMT",
"version": "v2"
}
] | 2020-04-03 | [
[
"Shoshany",
"Barak",
""
]
] | Spin networks, the quantum states of discrete geometry in loop quantum gravity, are directed graphs whose links are labeled by irreducible representations of SU(2), or spins. Cosmic strings are 1-dimensional topological defects carrying distributional curvature in an otherwise flat spacetime. In this paper we prove tha... |
gr-qc/9907033 | Dr. Asher Yahalom | Hai Halevi | Unmissing the Missing Matter in Neo-Kaluza-Klein Universes | 12 pages | null | null | null | gr-qc | null | Uncompactified KK universes are so intrinsically connected to the otherwise
only empirically required "missing" Dark Matter (DM), that:
1) They yield a simple prediction which explains both the enigma of the
extra-dimensions' (XD) unobservability and the enigma of the present DM. The
two enigmas are "annihilated" i... | [
{
"created": "Thu, 8 Jul 1999 05:22:54 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jul 1999 14:46:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Halevi",
"Hai",
""
]
] | Uncompactified KK universes are so intrinsically connected to the otherwise only empirically required "missing" Dark Matter (DM), that: 1) They yield a simple prediction which explains both the enigma of the extra-dimensions' (XD) unobservability and the enigma of the present DM. The two enigmas are "annihilated" into ... |
1812.09161 | Sven Herrmann | Sven Herrmann, Felix Finke, Martin L\"ulf, Olga Kichakova, Dirk
Puetzfeld, Daniela Knickmann, Meike List, Benny Rievers, Gabriele Giorgi,
Christoph G\"unther, Hansj\"org Dittus, Roberto Prieto-Cerdeira, Florian
Dilssner, Francisco Gonzalez, Erik Sch\"onemann, Javier Ventura-Traveset,
Claus L\"ammerzahl | Test of the Gravitational Redshift with Galileo Satellites in an
Eccentric Orbit | 6 pages, 3 figures, published in Phys. Rev. Lett. 121, 231102 | Physical Review Letters, Vol. 121, Iss. 23, p. 231102, 7 December
2018 | 10.1103/PhysRevLett.121.231102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On August 22, 2014, the satellites GSAT-0201 and GSAT-0202 of the European
GNSS Galileo were unintentionally launched into eccentric orbits. Unexpectedly,
this has become a fortunate scientific opportunity since the onboard hydrogen
masers allow for a sensitive test of the redshift predicted by the theory of
general ... | [
{
"created": "Fri, 21 Dec 2018 14:51:17 GMT",
"version": "v1"
}
] | 2018-12-24 | [
[
"Herrmann",
"Sven",
""
],
[
"Finke",
"Felix",
""
],
[
"Lülf",
"Martin",
""
],
[
"Kichakova",
"Olga",
""
],
[
"Puetzfeld",
"Dirk",
""
],
[
"Knickmann",
"Daniela",
""
],
[
"List",
"Meike",
""
],
[
"Ri... | On August 22, 2014, the satellites GSAT-0201 and GSAT-0202 of the European GNSS Galileo were unintentionally launched into eccentric orbits. Unexpectedly, this has become a fortunate scientific opportunity since the onboard hydrogen masers allow for a sensitive test of the redshift predicted by the theory of general re... |
1403.5706 | Everton Murilo Carvalho Abreu | Rafael da C. Nunes, Ed\'esio M. Barboza Jr., Everton M. C. Abreu and
Jorge Ananias Neto | Dark energy models through nonextensive Tsallis' statistics | 7 pages, two-column format | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The accelerated expansion of the Universe is one of the greatest challenges
of modern physics. One candidate to explain this phenomenon is a new field
called dark energy. In this work we have used the Tsallis nonextensive
statistical formulation of the Friedmann equation to explore the
Barboza-Alcaniz and Chevalier-P... | [
{
"created": "Sat, 22 Mar 2014 21:52:22 GMT",
"version": "v1"
}
] | 2014-03-25 | [
[
"Nunes",
"Rafael da C.",
""
],
[
"Barboza",
"Edésio M.",
"Jr."
],
[
"Abreu",
"Everton M. C.",
""
],
[
"Neto",
"Jorge Ananias",
""
]
] | The accelerated expansion of the Universe is one of the greatest challenges of modern physics. One candidate to explain this phenomenon is a new field called dark energy. In this work we have used the Tsallis nonextensive statistical formulation of the Friedmann equation to explore the Barboza-Alcaniz and Chevalier-Pol... |
1001.1243 | Mubasher Jamil | Mubasher Jamil and M. Umar Farooq | Phantom Wormholes in (2+1)-dimensions | 10 pages, 5 figures | Int.J.Theor.Phys.49:835-841,2010 | 10.1007/s10773-010-0263-z | arXiv:1001.1243v1 [gr-qc] | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have constructed a (2+1)-dimensional wormhole using
inhomogeneous and anisotropic distribution of phantom energy. We have
determined the exact form of the equation of state of phantom energy that
supports the wormhole structure. Interestingly, this equation of state is
linear but variable one and is... | [
{
"created": "Fri, 8 Jan 2010 11:38:30 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Jamil",
"Mubasher",
""
],
[
"Farooq",
"M. Umar",
""
]
] | In this paper, we have constructed a (2+1)-dimensional wormhole using inhomogeneous and anisotropic distribution of phantom energy. We have determined the exact form of the equation of state of phantom energy that supports the wormhole structure. Interestingly, this equation of state is linear but variable one and is d... |
gr-qc/9503038 | Sardanashvily Gennadi | G. Sardanashvily (Moscow State University) | Stress-Energy-Momentum Tensors in Constraint Field Theories | 25 pp, LaTeX file | J.Math.Phys. 38 (1997) 847-866 | 10.1063/1.531873 | TP\95\043 | gr-qc dg-ga hep-th math.DG | null | One has not any conventional energy-momentum conservation law in Lagrangian
field theory, but relations involving different stress-energy-momentum tensors
associated with different connections. It is not obvious how to choose the true
energy-momentum tensor. This problem is solved in the framework of the
multimomentu... | [
{
"created": "Wed, 22 Mar 1995 15:54:58 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Sardanashvily",
"G.",
"",
"Moscow State University"
]
] | One has not any conventional energy-momentum conservation law in Lagrangian field theory, but relations involving different stress-energy-momentum tensors associated with different connections. It is not obvious how to choose the true energy-momentum tensor. This problem is solved in the framework of the multimomentum ... |
1608.02532 | Luis Cort\'es Barbado | Luis C. Barbado, Carlos Barcel\'o, Luis J. Garay and Gil Jannes | Hawking versus Unruh effects, or the difficulty of slowly crossing a
black hole horizon | Minor corrections to match the published version. 14 pages, 2 figures | null | 10.1007/JHEP10(2016)161 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When analyzing the perception of Hawking radiation by different observers,
the Hawking effect becomes mixed with the Unruh effect. The separation of both
effects is not always clear in the literature. Here we propose an
inconsistency-free interpretation of what constitutes a Hawking effect and what
an Unruh effect. A... | [
{
"created": "Mon, 8 Aug 2016 17:53:42 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2016 14:59:35 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Nov 2016 11:16:20 GMT",
"version": "v3"
}
] | 2016-11-29 | [
[
"Barbado",
"Luis C.",
""
],
[
"Barceló",
"Carlos",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Jannes",
"Gil",
""
]
] | When analyzing the perception of Hawking radiation by different observers, the Hawking effect becomes mixed with the Unruh effect. The separation of both effects is not always clear in the literature. Here we propose an inconsistency-free interpretation of what constitutes a Hawking effect and what an Unruh effect. An ... |
gr-qc/0306119 | Pantelis S. Apostolopoulos | Pantelis S. Apostolopoulos | Self-similar Bianchi models: I. Class A models | 14 pages, Latex; to appear in Classical and Quantum Gravity | Class.Quant.Grav. 20 (2003) 3371-3384 | 10.1088/0264-9381/20/15/307 | null | gr-qc | null | We present a study of Bianchi class A tilted cosmological models admitting a
proper homothetic vector field together with the restrictions, both at the
geometrical and dynamical level, imposed by the existence of the simply
transitive similarity group. The general solution of the symmetry equations and
the form of th... | [
{
"created": "Thu, 26 Jun 2003 17:40:00 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Apostolopoulos",
"Pantelis S.",
""
]
] | We present a study of Bianchi class A tilted cosmological models admitting a proper homothetic vector field together with the restrictions, both at the geometrical and dynamical level, imposed by the existence of the simply transitive similarity group. The general solution of the symmetry equations and the form of the ... |
1202.2733 | Marc Diaz-Aguilo Mr. | Marc Diaz-Aguil\'o, Enrique Garc\'ia-Berro, Alberto Lobo | Inflight magnetic characterization of the test masses onboard LISA
Pathfinder | 12 pages, 7 figures, Physical Review D, accepted on Feb 6th, 2012 | null | 10.1103/PhysRevD.85.042004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LISA Pathfinder is a science and technology demonstrator of the European
Space Agency within the framework of its LISA mission, the latter aiming to be
the first space-borne gravitational wave observatory. The payload of LISA
Pathfinder is the so-called LISA Technology Package, which is designed to
measure relative a... | [
{
"created": "Mon, 13 Feb 2012 13:57:24 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Diaz-Aguiló",
"Marc",
""
],
[
"García-Berro",
"Enrique",
""
],
[
"Lobo",
"Alberto",
""
]
] | LISA Pathfinder is a science and technology demonstrator of the European Space Agency within the framework of its LISA mission, the latter aiming to be the first space-borne gravitational wave observatory. The payload of LISA Pathfinder is the so-called LISA Technology Package, which is designed to measure relative acc... |
2207.12403 | Farook Rahaman | Susmita Sarkar, Nayan Sarkar, Farook Rahaman and Y Aditya | Wormholes in $\kappa(R,T)$ gravity | 15 pages, 12 figures. Published in To Physics Journal Vol 2, page 7
(2019) | To Physics Journal Vol 2, page 7 (2019) | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The wormhole solution could be found by solving the Einstein field equations
with violating the null energy condition (NEC). We represent wormhole solutions
in $\kappa(R,T)$ gravity in two different ways. At first, we find the shape
function by considering a redshift function and linear equation of state
(EoS). The... | [
{
"created": "Sat, 23 Jul 2022 18:40:38 GMT",
"version": "v1"
}
] | 2022-07-27 | [
[
"Sarkar",
"Susmita",
""
],
[
"Sarkar",
"Nayan",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Aditya",
"Y",
""
]
] | The wormhole solution could be found by solving the Einstein field equations with violating the null energy condition (NEC). We represent wormhole solutions in $\kappa(R,T)$ gravity in two different ways. At first, we find the shape function by considering a redshift function and linear equation of state (EoS). The sol... |
1507.01787 | Thomas Adams Dr | T. Adams (for the LIGO Scientific Collaboration, and the Virgo
Collaboration) | Low latency search for compact binary coalescences using MBTA | 4 pages, 2 figures, To appear in Proceedings of the 50th Rencontres
de Moriond | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Multi-Band Template Analysis is a low-latency analysis pipeline for the
detection of gravitational waves to triggering electromagnetic follow up
observations. Coincident observation of gravitational waves and an
electromagnetic counterpart will allow us to develop a complete picture of
energetic astronomical even... | [
{
"created": "Tue, 7 Jul 2015 13:05:39 GMT",
"version": "v1"
}
] | 2019-08-15 | [
[
"Adams",
"T.",
"",
"for the LIGO Scientific Collaboration, and the Virgo\n Collaboration"
]
] | The Multi-Band Template Analysis is a low-latency analysis pipeline for the detection of gravitational waves to triggering electromagnetic follow up observations. Coincident observation of gravitational waves and an electromagnetic counterpart will allow us to develop a complete picture of energetic astronomical events... |
1007.2546 | Florian Bauer | Florian Bauer | Filtering out the cosmological constant in the Palatini formalism of
modified gravity | 22 pages, 1 figure, discussion extended, references added, accepted
by Gen.Rel.Grav | Gen.Rel.Grav.43:1733-1757,2011 | 10.1007/s10714-011-1153-2 | ICCUB-10-048 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to theoretical physics the cosmological constant (CC) is expected
to be much larger in magnitude than other energy densities in the universe,
which is in stark contrast to the observed Big Bang evolution. We address this
old CC problem not by introducing an extremely fine-tuned counterterm, but in
the conte... | [
{
"created": "Thu, 15 Jul 2010 13:02:53 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2011 16:27:18 GMT",
"version": "v2"
}
] | 2011-05-10 | [
[
"Bauer",
"Florian",
""
]
] | According to theoretical physics the cosmological constant (CC) is expected to be much larger in magnitude than other energy densities in the universe, which is in stark contrast to the observed Big Bang evolution. We address this old CC problem not by introducing an extremely fine-tuned counterterm, but in the context... |
1404.2727 | Vyacheslav Ivanovich Dokuchaev | V. A. Berezin and V. I. Dokuchaev | Neutral thin shell immersed into the Reissner-Nordstr\"om space-time | 70 pages, 60 figures | null | null | Preprint INR RAS 1383/2014 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from Israel equations for the spherically symmetric thin shells we
introduce the effective potential and show how it can be used in constructing,
without further thorough investigation, the corresponding Carter-Penrose
diagrams describing clearly the global geometry of the composite space-time
manifolds. We ... | [
{
"created": "Thu, 10 Apr 2014 08:20:44 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Berezin",
"V. A.",
""
],
[
"Dokuchaev",
"V. I.",
""
]
] | Starting from Israel equations for the spherically symmetric thin shells we introduce the effective potential and show how it can be used in constructing, without further thorough investigation, the corresponding Carter-Penrose diagrams describing clearly the global geometry of the composite space-time manifolds. We de... |
1412.5453 | Salvatore Capozziello | A. V. Astashenok, S. Capozziello, S. D. Odintsov | Nonperturbative models of quark stars in $f(R)$ gravity | 9 pages, 5 figures, accepted for publication in Phys. Lett. B | null | 10.1016/j.physletb.2015.01.030 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quark star models with realistic equation of state in nonperturbative $f(R)$
gravity are considered. The mass-radius relation for $f(R)=R+\alpha R^2$ model
is obtained. Considering scalar curvature $R$ as an independent function, one
can find out, for each value of central density, the unique value of central
curvatu... | [
{
"created": "Wed, 17 Dec 2014 15:57:09 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jan 2015 08:43:33 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Astashenok",
"A. V.",
""
],
[
"Capozziello",
"S.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | Quark star models with realistic equation of state in nonperturbative $f(R)$ gravity are considered. The mass-radius relation for $f(R)=R+\alpha R^2$ model is obtained. Considering scalar curvature $R$ as an independent function, one can find out, for each value of central density, the unique value of central curvature... |
1704.06617 | Maria Skugoreva | Maria A. Skugoreva | Late-time power-law stages of cosmological evolution in teleparallel
gravity with nonminimal coupling | 14 pages, 7 figures, some clarifications and references added,
published version | Grav. Cosmol. 24 (1), 103-111 (2018) | 10.1134/S0202289318010139 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Universe evolution at late-time stages in models of
teleparallel gravity with power-law nonminimal coupling and a decreasing
power-law potential of the scalar field $\phi$. New asymptotic solutions are
found analytically for these models in vacuum and with a perfect fluid.
Applying numerical integr... | [
{
"created": "Fri, 21 Apr 2017 16:16:06 GMT",
"version": "v1"
},
{
"created": "Fri, 4 May 2018 23:37:15 GMT",
"version": "v2"
}
] | 2018-05-08 | [
[
"Skugoreva",
"Maria A.",
""
]
] | We investigate the Universe evolution at late-time stages in models of teleparallel gravity with power-law nonminimal coupling and a decreasing power-law potential of the scalar field $\phi$. New asymptotic solutions are found analytically for these models in vacuum and with a perfect fluid. Applying numerical integrat... |
1402.6511 | Leszek Soko{\l}owski | Leszek M. Soko{\l}owski and Zdzis{\l}aw A. Golda | The local and global geometrical aspects of the twin paradox in static
spacetimes: I. Three spherically symmetric spacetimes | 27 pages, 0 figures, typos corrected, version published in APP B | Acta Phys. Polon. B45 (2014) 1051-1075 | 10.5506/APhysPolB.45.1051 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate local and global properties of timelike geodesics in three
static spherically symmetric spacetimes. These properties are of its own
mathematical relevance and provide a solution of the physical `twin paradox'
problem. The latter means that we focus our studies on the search of the
longest timelike geod... | [
{
"created": "Wed, 26 Feb 2014 12:21:43 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 2014 07:58:50 GMT",
"version": "v2"
}
] | 2014-06-05 | [
[
"Sokołowski",
"Leszek M.",
""
],
[
"Golda",
"Zdzisław A.",
""
]
] | We investigate local and global properties of timelike geodesics in three static spherically symmetric spacetimes. These properties are of its own mathematical relevance and provide a solution of the physical `twin paradox' problem. The latter means that we focus our studies on the search of the longest timelike geodes... |
1304.6290 | Giorgio Papini | Giorgio Papini | Fermion-antifermion mixing in gravitational fields | 5 pages | Modern Physics Letters A 28, No. 17 (2013) 1350071 | 10.1142/SO217732313500715 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mixing of fermion and antifermion states occurs in gravitational
interactions, leading to non-conservation of fermion number above temperatures
determined by the particle masses. We study the evolution of a $f\,,\bar{f}$
system and calculate the cross sections for the reactions
$f\rightleftharpoons\bar{f}$. Their val... | [
{
"created": "Tue, 23 Apr 2013 14:05:02 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Papini",
"Giorgio",
""
]
] | Mixing of fermion and antifermion states occurs in gravitational interactions, leading to non-conservation of fermion number above temperatures determined by the particle masses. We study the evolution of a $f\,,\bar{f}$ system and calculate the cross sections for the reactions $f\rightleftharpoons\bar{f}$. Their value... |
2111.04768 | Nosratollah Jafari Sonbolabadi | Ahmad Shariati, Nosratollah Jafari | Modified Inertia as Nonconservative Newtonian Dynamics | 9 pages, 1 figure | Phys.Rev.D 104 (2021) 8, 084070 | 10.1103/PhysRevD.104.084070 | null | gr-qc astro-ph.CO astro-ph.GA hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Modified Newtonian dynamics by Milgrom is a paradigm for explaining the
rotation curves of spiral galaxies and various other large scale structures.
This paradigm includes several different theories. Here we present Milgrom's
modified inertia (MI) theory in terms of a simple and tractable
non-conservative Newtonian d... | [
{
"created": "Mon, 8 Nov 2021 19:03:13 GMT",
"version": "v1"
}
] | 2021-11-12 | [
[
"Shariati",
"Ahmad",
""
],
[
"Jafari",
"Nosratollah",
""
]
] | Modified Newtonian dynamics by Milgrom is a paradigm for explaining the rotation curves of spiral galaxies and various other large scale structures. This paradigm includes several different theories. Here we present Milgrom's modified inertia (MI) theory in terms of a simple and tractable non-conservative Newtonian dyn... |
1908.08410 | Behnam Pourhassan | M. Rostami, J. Sadeghi, S. Miraboutalebi, A. A. Masoudi, and B.
Pourhassan | Charged accelerating AdS black hole of $f(R)$ gravity and the
Joule-Thomson expansion | 19 pages, 7 figures | Int.J.Geom.Meth.Mod.Phys. 17 (2020) 09, 2050136 | 10.1142/S0219887820501364 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the thermodynamical properties and the phase transitions of
the charged accelerating anti-de Sitter (AdS) black holes are investigated in
the framework of the $f(R)$ gravity. By studying the conditions for the phase
transitions, it has been shown that the $P-V$ criticality and the van der Waals
like ph... | [
{
"created": "Wed, 21 Aug 2019 08:35:45 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Aug 2019 06:28:17 GMT",
"version": "v2"
}
] | 2021-11-09 | [
[
"Rostami",
"M.",
""
],
[
"Sadeghi",
"J.",
""
],
[
"Miraboutalebi",
"S.",
""
],
[
"Masoudi",
"A. A.",
""
],
[
"Pourhassan",
"B.",
""
]
] | In this paper, the thermodynamical properties and the phase transitions of the charged accelerating anti-de Sitter (AdS) black holes are investigated in the framework of the $f(R)$ gravity. By studying the conditions for the phase transitions, it has been shown that the $P-V$ criticality and the van der Waals like phas... |
1907.03776 | Suprit Singh | Viqar Husain, Suprit Singh | Matter-Geometry entanglement in quantum cosmology | Important work. 7 Pages, 6 figures. Accepted for publication in CQG
Letters | null | 10.1088/1361-6382/ab9d97 | null | gr-qc hep-th physics.comp-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of the evolution of entanglement entropy of matter and
geometry in quantum cosmology. For a variety of Gaussian initial states and
their linear combinations, and with evolution defined with respect to a
relational time, we show numerically that (i) entanglement entropy increases
rapidly at very ear... | [
{
"created": "Mon, 8 Jul 2019 18:00:08 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2019 17:22:17 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jun 2020 22:57:12 GMT",
"version": "v3"
}
] | 2020-09-10 | [
[
"Husain",
"Viqar",
""
],
[
"Singh",
"Suprit",
""
]
] | We present a study of the evolution of entanglement entropy of matter and geometry in quantum cosmology. For a variety of Gaussian initial states and their linear combinations, and with evolution defined with respect to a relational time, we show numerically that (i) entanglement entropy increases rapidly at very early... |
1407.3420 | Soon-Tae Hong | Soon-Tae Hong | Photon size in higher dimensional phantom cosmology | 6 pages, 3 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study a higher dimensional cosmology with phantom field associated with a
negative kinetic term. Assuming that the universe possesses the phantom field
defined in $D$ dimensional spacetime, we investigate in detail the solutions
involved in the higher dimensional phantom cosmology, to explicitly predict
photon siz... | [
{
"created": "Sat, 12 Jul 2014 23:19:28 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Apr 2015 08:34:23 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jun 2021 06:49:23 GMT",
"version": "v3"
}
] | 2021-06-28 | [
[
"Hong",
"Soon-Tae",
""
]
] | We study a higher dimensional cosmology with phantom field associated with a negative kinetic term. Assuming that the universe possesses the phantom field defined in $D$ dimensional spacetime, we investigate in detail the solutions involved in the higher dimensional phantom cosmology, to explicitly predict photon size ... |
gr-qc/9507022 | Ken-ichi Nakao | Ken-ichi Nakao | On a Quasi-Local Energy Outside the Cosmological Horizon | 5 pages, uuencode compressed latex | null | null | KUNS-1352 | gr-qc | null | We investigate a quasi-local energy naturally introduced by Kodama's
prescription for a spherically symmetric space-time with a positive
cosmological constant $\Lambda$. We find that this quasi-local energy is well
behaved inside a cosmological horizon. However, when there is a scalar field
with a long enough Compton... | [
{
"created": "Tue, 11 Jul 1995 11:18:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nakao",
"Ken-ichi",
""
]
] | We investigate a quasi-local energy naturally introduced by Kodama's prescription for a spherically symmetric space-time with a positive cosmological constant $\Lambda$. We find that this quasi-local energy is well behaved inside a cosmological horizon. However, when there is a scalar field with a long enough Compton w... |
0805.2813 | Sean A. Hayward | Sean A. Hayward | Energy of gravitational radiation in plane-symmetric space-times | 7 REVTeX4 pages | Phys.Rev.D78:044027,2008 | 10.1103/PhysRevD.78.044027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational radiation in plane-symmetric space-times can be encoded in a
complex potential, satisfying a non-linear wave equation. An effective energy
tensor for the radiation is given, taking a scalar-field form in terms of the
potential, entering the field equations in the same way as the matter energy
tensor. It... | [
{
"created": "Mon, 19 May 2008 08:43:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hayward",
"Sean A.",
""
]
] | Gravitational radiation in plane-symmetric space-times can be encoded in a complex potential, satisfying a non-linear wave equation. An effective energy tensor for the radiation is given, taking a scalar-field form in terms of the potential, entering the field equations in the same way as the matter energy tensor. It r... |
gr-qc/0608139 | Andrea Geralico | D. Bini, A. Geralico, R. Ruffini | On the equilibrium of a charged massive particle in the field of a
Reissner-Nordstr\"om black hole | 9 pages, els macros | Phys.Lett.A360:515-517,2007 | 10.1016/j.physleta.2006.09.028 | null | gr-qc astro-ph | null | The multiyear problem of a two-body system consisting of a
Reissner-Nordstr\"om black hole and a charged massive particle at rest is here
solved by an exact perturbative solution of the full Einstein-Maxwell system of
equations. The expressions of the metric and of the electromagnetic field,
including the effects of ... | [
{
"created": "Thu, 31 Aug 2006 13:40:33 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bini",
"D.",
""
],
[
"Geralico",
"A.",
""
],
[
"Ruffini",
"R.",
""
]
] | The multiyear problem of a two-body system consisting of a Reissner-Nordstr\"om black hole and a charged massive particle at rest is here solved by an exact perturbative solution of the full Einstein-Maxwell system of equations. The expressions of the metric and of the electromagnetic field, including the effects of th... |
1411.2854 | Marios Christodoulou | Marios Christodoulou and Carlo Rovelli | How big is a black hole? | 7 pages, 5 figures. References added | Phys. Rev. D 91, 064046 (2015) | 10.1103/PhysRevD.91.064046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 3d volume inside a spherical black hole can be defined by extending an
intrinsic flat-spacetime characterization of the volume inside a 2-sphere. For
a collapsed object, the volume grows with time since the collapse, reaching a
simple asymptotic form, which has a compelling geometrical interpretation.
Perhaps sur... | [
{
"created": "Tue, 11 Nov 2014 15:36:39 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 2015 20:00:57 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Mar 2015 18:56:28 GMT",
"version": "v3"
}
] | 2015-03-25 | [
[
"Christodoulou",
"Marios",
""
],
[
"Rovelli",
"Carlo",
""
]
] | The 3d volume inside a spherical black hole can be defined by extending an intrinsic flat-spacetime characterization of the volume inside a 2-sphere. For a collapsed object, the volume grows with time since the collapse, reaching a simple asymptotic form, which has a compelling geometrical interpretation. Perhaps surpr... |
1906.05978 | Zack Carson | Zack Carson, Andrew W. Steiner, Kent Yagi | Future Prospects for Constraining Nuclear Matter Parameters with
Gravitational Waves | 16 pages, 17 figures; new citations, hybrid star discussion paragraph
added; Used conditional probability distributions on tidal deformability and
nuclear parameters, rather than the two-dimensional PDFs | Phys. Rev. D 100, 023012 (2019) | 10.1103/PhysRevD.100.023012 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational wave emission from the merging binary neutron star system
GW170817 arrived full of tidal information which can be used to probe the
fundamental ultra-dense nuclear physics residing in these stars. In previous
work, we used two-dimensional correlations between nuclear matter parameters
and tidal defo... | [
{
"created": "Fri, 14 Jun 2019 01:24:20 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2019 13:38:51 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Sep 2020 07:12:55 GMT",
"version": "v3"
}
] | 2020-09-23 | [
[
"Carson",
"Zack",
""
],
[
"Steiner",
"Andrew W.",
""
],
[
"Yagi",
"Kent",
""
]
] | The gravitational wave emission from the merging binary neutron star system GW170817 arrived full of tidal information which can be used to probe the fundamental ultra-dense nuclear physics residing in these stars. In previous work, we used two-dimensional correlations between nuclear matter parameters and tidal deform... |
1208.5756 | Andrei Lebed G | Andrei G. Lebed | Breakdown of the Equivalence between Passive Gravitational Mass and
Energy for a Quantum Body | Talk at the 13th Marcel Grossmann Meeting on General Relativity
(Stockholm, Sweden, 1-7 July 2012), to be published in the proceedings of the
Meeting | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that passive gravitational mass operator of a hydrogen atom in
the post-Newtonian approximation of the general relativity does not commute
with its energy operator, taken in the absence of gravitational field.
Nevertheless, the equivalence between the expectation values of passive
gravitational mass and e... | [
{
"created": "Mon, 27 Aug 2012 17:43:38 GMT",
"version": "v1"
}
] | 2012-08-29 | [
[
"Lebed",
"Andrei G.",
""
]
] | It is shown that passive gravitational mass operator of a hydrogen atom in the post-Newtonian approximation of the general relativity does not commute with its energy operator, taken in the absence of gravitational field. Nevertheless, the equivalence between the expectation values of passive gravitational mass and ene... |
1107.3705 | Hayato Motohashi | Hayato Motohashi, Teruaki Suyama | Black hole perturbation in parity violating gravitational theories | 17 pages; v2: References and physical discussion added, results
unchanged, matches published version in PRD | Phys. Rev. D 84, 084041 (2011) | 10.1103/PhysRevD.84.084041 | RESCEU-27/11 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study linear perturbations around the static and spherically symmetric
spacetime for the gravitational theories whose Lagrangian depends on Ricci
scalar and the parity violating Chern-Simons term. By an explicit construction,
we show that Hamiltonian for the perturbation variables is not bounded from
below in gene... | [
{
"created": "Tue, 19 Jul 2011 13:00:08 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2011 04:53:48 GMT",
"version": "v2"
}
] | 2011-12-15 | [
[
"Motohashi",
"Hayato",
""
],
[
"Suyama",
"Teruaki",
""
]
] | We study linear perturbations around the static and spherically symmetric spacetime for the gravitational theories whose Lagrangian depends on Ricci scalar and the parity violating Chern-Simons term. By an explicit construction, we show that Hamiltonian for the perturbation variables is not bounded from below in genera... |
1409.2115 | Qing-Yu Cai | Dongshan He and Qing-yu Cai | Inflation of small true vacuum bubble by quantization of
Einstein-Hilbert action | Final version | Science China 58, 079801 (2015) | 10.1007/s11433-015-5659-6 | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantization of the Einstein-Hilbert action for a small true
vacuum bubble without matter or scalar field. The quantization of action
induces an extra term of potential called quantum potential in Hamilton-Jacobi
equation, which gives expanding solutions including the exponential expansion
solutions of t... | [
{
"created": "Sun, 7 Sep 2014 13:02:42 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Mar 2015 11:47:29 GMT",
"version": "v2"
}
] | 2015-03-31 | [
[
"He",
"Dongshan",
""
],
[
"Cai",
"Qing-yu",
""
]
] | We study the quantization of the Einstein-Hilbert action for a small true vacuum bubble without matter or scalar field. The quantization of action induces an extra term of potential called quantum potential in Hamilton-Jacobi equation, which gives expanding solutions including the exponential expansion solutions of the... |
gr-qc/9607011 | Fernando Barbero | J. F. Barbero G., A. Dominguez, T. Goldman and J. Perez-Mercader | Dynamical Critical Phenomena and Large Scale Structure of the Universe:
the Power Spectrum for Density Fluctuations | 13 pages with 2 encapsulated PostScript figures included, gzipped tar
format | null | 10.1209/epl/i1997-00296-0 | LAEFF-96/15 | gr-qc astro-ph | null | As is well known, structure formation in the Universe at times after
decoupling can be described by hydrodynamic equations. These are shown here to
be equivalent to a generalization of the stochastic Kardar--Parisi--Zhang
equation with time-- dependent viscosity in epochs of dissipation. As a
consequence of the Dynam... | [
{
"created": "Thu, 4 Jul 1996 10:33:36 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"G.",
"J. F. Barbero",
""
],
[
"Dominguez",
"A.",
""
],
[
"Goldman",
"T.",
""
],
[
"Perez-Mercader",
"J.",
""
]
] | As is well known, structure formation in the Universe at times after decoupling can be described by hydrodynamic equations. These are shown here to be equivalent to a generalization of the stochastic Kardar--Parisi--Zhang equation with time-- dependent viscosity in epochs of dissipation. As a consequence of the Dynamic... |
2205.15207 | Phongpichit Channuie | Narakorn Kaewkhao (Prince Songkla U.), Phongpichit Channuie (Walailak
U.) | Adiabatic invariant approach on Friedmann cyclic universe | v1: 5 pages, no figure | Nucl.Phys.B 987 (2023) 116088 | 10.1016/j.nuclphysb.2023.116088 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Oscillating or cyclic models of the universe were inspired by Friedmann's
seminal paper of 1922. The model supposes a closed universe. In this work, we
study Friedmann closed universe using the adiabatic invariant approach. We
start revisiting the cosmological force proposed by N. Rosen and derive the
Lagrangian dens... | [
{
"created": "Mon, 30 May 2022 16:03:58 GMT",
"version": "v1"
}
] | 2023-01-24 | [
[
"Kaewkhao",
"Narakorn",
"",
"Prince Songkla U."
],
[
"Channuie",
"Phongpichit",
"",
"Walailak\n U."
]
] | Oscillating or cyclic models of the universe were inspired by Friedmann's seminal paper of 1922. The model supposes a closed universe. In this work, we study Friedmann closed universe using the adiabatic invariant approach. We start revisiting the cosmological force proposed by N. Rosen and derive the Lagrangian densit... |
gr-qc/9412011 | Takahiro Tanaka | Kazuhiro Yamamoto, Takahiro Tanaka and Misao Sasaki | Particle Spectrum Created Through Bubble Nucleation | 14 pages, revtex file, 4 uuencoded compressed postscript figures
appended at the end | Phys.Rev.D51:2968-2978,1995 | 10.1103/PhysRevD.51.2968 | KUNS 1305 | gr-qc | null | Using the multi-dimensional wave function formalism, we investigate the
quantum state of a scalar field inside a true vacuum bubble nucleated through
false vacuum decay in flat spacetime. We developed a formalism which allows us
a mode-by-mode analysis. To demonstrate its advantage, we describe in detail
the evolutio... | [
{
"created": "Sat, 3 Dec 1994 09:42:29 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Yamamoto",
"Kazuhiro",
""
],
[
"Tanaka",
"Takahiro",
""
],
[
"Sasaki",
"Misao",
""
]
] | Using the multi-dimensional wave function formalism, we investigate the quantum state of a scalar field inside a true vacuum bubble nucleated through false vacuum decay in flat spacetime. We developed a formalism which allows us a mode-by-mode analysis. To demonstrate its advantage, we describe in detail the evolution ... |
1011.4249 | Alejandro Corichi | Alejandro Corichi and Asieh Karami | On the measure problem in slow roll inflation and loop quantum cosmology | 14 pages, 3 figures. Typos corrected, discussion expanded. Version to
be published in PRD | Phys.Rev.D83:104006,2011 | 10.1103/PhysRevD.83.104006 | IGC-11/2-2 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the measure problem in standard slow-roll inflationary models
from the perspective of loop quantum cosmology (LQC). Following recent results
by Ashtekar and Sloan, we study the probability of having enough e-foldings and
focus on its dependence on the quantum gravity scale, including the transition
of the... | [
{
"created": "Thu, 18 Nov 2010 18:26:32 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Apr 2011 22:56:36 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Corichi",
"Alejandro",
""
],
[
"Karami",
"Asieh",
""
]
] | We consider the measure problem in standard slow-roll inflationary models from the perspective of loop quantum cosmology (LQC). Following recent results by Ashtekar and Sloan, we study the probability of having enough e-foldings and focus on its dependence on the quantum gravity scale, including the transition of the t... |
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