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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0508062 | Martin Snajdr | Martin Snajdr | Critical Collapse of an Ultrarelativistic Fluid in the $\Gamma\to 1$
Limit | 23 pages, 16 figures, revised version, added new results of
investigation of a supercritical collapse and the existence of naked
singularities in generic gravitational collapse | Class.Quant.Grav. 23 (2006) 3333-3352 | 10.1088/0264-9381/23/10/006 | null | gr-qc | null | In this paper we investigate the critical collapse of an ultrarelativistic
perfect fluid with the equation of state $P=(\Gamma-1)\rho$ in the limit of
$\Gamma\to 1$. We calculate the limiting continuously self similar (CSS)
solution and the limiting scaling exponent by exploiting self-similarity of the
solution. We a... | [
{
"created": "Tue, 16 Aug 2005 05:30:39 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2006 06:00:38 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Snajdr",
"Martin",
""
]
] | In this paper we investigate the critical collapse of an ultrarelativistic perfect fluid with the equation of state $P=(\Gamma-1)\rho$ in the limit of $\Gamma\to 1$. We calculate the limiting continuously self similar (CSS) solution and the limiting scaling exponent by exploiting self-similarity of the solution. We als... |
1511.05287 | Titus K Mathew | Athira Sasidharan, Titus K Mathew | Phase space analysis of bulk viscous matter dominated universe | 22 pages and 3 figures | JHEP 1606 (2016) 138 | 10.1007/JHEP06(2016)138 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a Friedmann model of the universe with bulk viscous matter and
radiation as the cosmic components. We study the asymptotic properties in the
equivalent phase space by considering the three cases for the bulk viscous
coefficient as (i) $\zeta = \zeta_{0}$, a constant (ii) $\zeta = \zeta_{0} +
\zeta_{1}\fra... | [
{
"created": "Tue, 17 Nov 2015 06:56:59 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2016 06:04:48 GMT",
"version": "v2"
}
] | 2019-05-13 | [
[
"Sasidharan",
"Athira",
""
],
[
"Mathew",
"Titus K",
""
]
] | We consider a Friedmann model of the universe with bulk viscous matter and radiation as the cosmic components. We study the asymptotic properties in the equivalent phase space by considering the three cases for the bulk viscous coefficient as (i) $\zeta = \zeta_{0}$, a constant (ii) $\zeta = \zeta_{0} + \zeta_{1}\frac{... |
2209.05060 | Marie-No\"elle C\'el\'erier | Marie-No\''elle C\'el\'erier (Observatoire de Paris) | Study of stationary rigidly rotating anisotropic cylindrical fluids with
new exact interior solutions of GR. 5. Dust limit and discussion | 8 pages, no figure | null | 10.1063/5.0121183 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The present article is the last in a series of five devoted to the study of
the effect of anisotropic pressure on the gravitationnal impact of a stationary
rigidly rotating cylindrically symmetric fluid with the use of new exact
solutions of General Relativity. In the four first papers in this series, three
kinds of ... | [
{
"created": "Mon, 12 Sep 2022 07:39:43 GMT",
"version": "v1"
}
] | 2023-05-24 | [
[
"Célérier",
"Marie-No\\''elle",
"",
"Observatoire de Paris"
]
] | The present article is the last in a series of five devoted to the study of the effect of anisotropic pressure on the gravitationnal impact of a stationary rigidly rotating cylindrically symmetric fluid with the use of new exact solutions of General Relativity. In the four first papers in this series, three kinds of pr... |
1302.3977 | Isha Pahwa | Isha Pahwa, Debajyoti Choudhury and T. R. Seshadri | Inflation in Higher Dimensional Gauss-Bonnet Cosmology | 11 pages, 7 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Gauss-Bonnet term naturally appears in the action for gravity when one
considers the existence of space time with dimensions more than 1+3. A variety
of inflationary models can be obtained within such a framework, once the scale
factor for the hidden dimension(s) is not constrained to be the same as that of
the vis... | [
{
"created": "Sat, 16 Feb 2013 16:43:15 GMT",
"version": "v1"
}
] | 2013-02-19 | [
[
"Pahwa",
"Isha",
""
],
[
"Choudhury",
"Debajyoti",
""
],
[
"Seshadri",
"T. R.",
""
]
] | A Gauss-Bonnet term naturally appears in the action for gravity when one considers the existence of space time with dimensions more than 1+3. A variety of inflationary models can be obtained within such a framework, once the scale factor for the hidden dimension(s) is not constrained to be the same as that of the visib... |
gr-qc/0606066 | Jian-Yang Zhu | Jun Ren, Jingyi Zhang, Zheng Zhao | Tunnelling Effect and Hawking Radiation from a Vaidya Black Hole | null | Chin.Phys.Lett. 23 (2006) 2019-2022 | 10.1088/0256-307X/23/8/016 | null | gr-qc | null | In this paper, we extend Parikh' work to the non-stationary black hole. As an
example of the non-stationary black hole, we study the tunnelling effect and
Hawking radiation from a Vaidya black hole whose Bondi mass is identical to its
mass parameter. We view Hawking radiation as a tunnelling process across the
event ... | [
{
"created": "Thu, 15 Jun 2006 12:50:22 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ren",
"Jun",
""
],
[
"Zhang",
"Jingyi",
""
],
[
"Zhao",
"Zheng",
""
]
] | In this paper, we extend Parikh' work to the non-stationary black hole. As an example of the non-stationary black hole, we study the tunnelling effect and Hawking radiation from a Vaidya black hole whose Bondi mass is identical to its mass parameter. We view Hawking radiation as a tunnelling process across the event ho... |
2407.08538 | Natalie Williams Ms | Natalie Williams, Patricia Schmidt, Geraint Pratten | PhenomGSF: A phenomenological model of gravitational self-force enhanced
tides in inspiralling binary neutron stars | 25 pages, 14 figures | null | null | LIGO Document P2400286 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from inspiralling binary neutron stars provide unique
access to ultra-dense nuclear matter and offer the ability to constrain the
currently unknown neutron star equation-of-state through tidal measurements.
This, however, requires the availability of accurate and efficient tidal
waveform models. I... | [
{
"created": "Thu, 11 Jul 2024 14:26:33 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Williams",
"Natalie",
""
],
[
"Schmidt",
"Patricia",
""
],
[
"Pratten",
"Geraint",
""
]
] | Gravitational waves from inspiralling binary neutron stars provide unique access to ultra-dense nuclear matter and offer the ability to constrain the currently unknown neutron star equation-of-state through tidal measurements. This, however, requires the availability of accurate and efficient tidal waveform models. In ... |
gr-qc/9703019 | Chris Chambers | Robert Geroch (Enrico Fermi Institute) | Suggestions For Giving Talks | 4 pages (no figures), Revtex, uses twocolumn.sty and header.sty
(included) | null | null | null | gr-qc | null | This is a latex'd version of Robert Geroch's 1973 notes entitled 'Suggestions
For Giving Talks'.
| [
{
"created": "Fri, 7 Mar 1997 00:09:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Geroch",
"Robert",
"",
"Enrico Fermi Institute"
]
] | This is a latex'd version of Robert Geroch's 1973 notes entitled 'Suggestions For Giving Talks'. |
1501.00331 | Alfredo Sandoval-Villalbazo | A. Sandoval-Villalbazo, A. R. Sagaceta-Mejia, and A. L.
Garcia-Perciante | On the kinetic foundations of Kaluza's magnetohydrodynamics | 13 pages, no figures. Accepted for publication in the Journal of
Non-Equilibrium Thermodynamics | J.Nonequil.Thermo. 40 (2015) 93 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent work has shown the existence of a relativistic effect present in a
single component non-equilibrium fluid, corresponding to a heat flux due to an
electric field. The treatment in that work was limited to a four-dimensional
Minkowksi space-time in which the Boltzmann equation was treated in a special
relativist... | [
{
"created": "Fri, 2 Jan 2015 00:25:55 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Feb 2015 01:37:13 GMT",
"version": "v2"
}
] | 2015-07-30 | [
[
"Sandoval-Villalbazo",
"A.",
""
],
[
"Sagaceta-Mejia",
"A. R.",
""
],
[
"Garcia-Perciante",
"A. L.",
""
]
] | Recent work has shown the existence of a relativistic effect present in a single component non-equilibrium fluid, corresponding to a heat flux due to an electric field. The treatment in that work was limited to a four-dimensional Minkowksi space-time in which the Boltzmann equation was treated in a special relativistic... |
2009.01623 | Jose Edgar Madriz Aguilar Dr. | Jos\'e Edgar Madriz Aguilar, A. Bernal, M. Montes, J. Zamarripa and E.
Aceves | Non-perturbative gauge invariant scalar fluctuations of the metric in
Higgs inflation from complex geometrical scalar-tensor theory of gravity | 8 pages, no figures. Revised version. arXiv admin note: text overlap
with arXiv:1908.06220 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we investigate gauge invariant scalar fluctuations of the
metric in a non-perturbative formalism for a Higgs inflationary model recently
introduced in the framework of a geometrical scalar-tensor theory of gravity.
In this scenario the Higgs inflaton field has its origin in the Weyl scalar
field of the... | [
{
"created": "Tue, 1 Sep 2020 23:25:02 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 2021 17:06:46 GMT",
"version": "v2"
}
] | 2021-08-31 | [
[
"Aguilar",
"José Edgar Madriz",
""
],
[
"Bernal",
"A.",
""
],
[
"Montes",
"M.",
""
],
[
"Zamarripa",
"J.",
""
],
[
"Aceves",
"E.",
""
]
] | In this letter we investigate gauge invariant scalar fluctuations of the metric in a non-perturbative formalism for a Higgs inflationary model recently introduced in the framework of a geometrical scalar-tensor theory of gravity. In this scenario the Higgs inflaton field has its origin in the Weyl scalar field of the b... |
gr-qc/9507024 | Don N. Page | Don N. Page (University of Alberta, Edmonton, Canada) | Sensible Quantum Mechanics: Are Probabilities only in the Mind? | LaTeX, 14 pages, shortened version of quant-ph/9506010 | Int.J.Mod.Phys. D5 (1996) 583-596 | 10.1142/S0218271896000370 | Alberta-Thy-13-95 | gr-qc quant-ph | null | Quantum mechanics may be formulated as {\it Sensible Quantum Mechanics} (SQM)
so that it contains nothing probabilistic except conscious perceptions. Sets of
these perceptions can be deterministically realized with measures given by
expectation values of positive-operator-valued {\it awareness operators}.
Ratios of t... | [
{
"created": "Tue, 11 Jul 1995 23:12:35 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Page",
"Don N.",
"",
"University of Alberta, Edmonton, Canada"
]
] | Quantum mechanics may be formulated as {\it Sensible Quantum Mechanics} (SQM) so that it contains nothing probabilistic except conscious perceptions. Sets of these perceptions can be deterministically realized with measures given by expectation values of positive-operator-valued {\it awareness operators}. Ratios of the... |
1403.4625 | Sergey Pavluchenko A. | Dmitry Chirkov, Sergey A. Pavluchenko, Alexey Toporensky | Constant volume exponential solutions in Einstein-Gauss-Bonnet flat
anisotropic cosmology with a perfect fluid | 12 pages, 1 figure; matches version accepted to Gen. Rel. Grav | General Relativity and Gravitation 46, 1799 (2014) | 10.1007/s10714-014-1799-7 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the constant volume exponential solutions (i.e.
the solutions with the scale factors change exponentially over time so that the
comoving volume remains the same) in the Einstein-Gauss-Bonnet gravity. We find
conditions for these solutions to exist and show that they are compatible with
an... | [
{
"created": "Tue, 18 Mar 2014 21:22:33 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2014 18:31:41 GMT",
"version": "v2"
}
] | 2014-12-17 | [
[
"Chirkov",
"Dmitry",
""
],
[
"Pavluchenko",
"Sergey A.",
""
],
[
"Toporensky",
"Alexey",
""
]
] | In this paper we investigate the constant volume exponential solutions (i.e. the solutions with the scale factors change exponentially over time so that the comoving volume remains the same) in the Einstein-Gauss-Bonnet gravity. We find conditions for these solutions to exist and show that they are compatible with any ... |
2201.03428 | Roberto Cotesta | Roberto Cotesta | Multipolar gravitational waveforms for spinning binary black holes and
their impact on source characterization | PhD thesis | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the last five years, gravitational-wave astronomy has gone from a purely
theoretical field into a thriving experimental science. Many gravitational-wave
signals, emitted by stellar-mass binary black holes and binary neutron stars,
have been detected, and many more are expected in the future. The observation
of the... | [
{
"created": "Mon, 10 Jan 2022 16:20:51 GMT",
"version": "v1"
}
] | 2022-01-11 | [
[
"Cotesta",
"Roberto",
""
]
] | In the last five years, gravitational-wave astronomy has gone from a purely theoretical field into a thriving experimental science. Many gravitational-wave signals, emitted by stellar-mass binary black holes and binary neutron stars, have been detected, and many more are expected in the future. The observation of the g... |
gr-qc/0112044 | Roberto A. Sussman | Luis G. Cabral-Rosetti, Tonatiuh Matos, Dario Nu\~nez and Roberto A.
Sussman | Hydrodynamics of galactic dark matter | LaTeX article style, 16 pages including three figures. Final version
to appear in Classical and Quantum Gravity | Class.Quant.Grav. 19 (2002) 3603-3616 | 10.1088/0264-9381/19/14/303 | null | gr-qc astro-ph hep-ph | null | We consider simple hydrodynamical models of galactic dark matter in which the
galactic halo is a self-gravitating and self-interacting gas that dominates the
dynamics of the galaxy. Modeling this halo as a sphericaly symmetric and static
perfect fluid satisfying the field equations of General Relativity, visible
bari... | [
{
"created": "Wed, 19 Dec 2001 00:36:31 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2002 18:38:24 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Cabral-Rosetti",
"Luis G.",
""
],
[
"Matos",
"Tonatiuh",
""
],
[
"Nuñez",
"Dario",
""
],
[
"Sussman",
"Roberto A.",
""
]
] | We consider simple hydrodynamical models of galactic dark matter in which the galactic halo is a self-gravitating and self-interacting gas that dominates the dynamics of the galaxy. Modeling this halo as a sphericaly symmetric and static perfect fluid satisfying the field equations of General Relativity, visible barion... |
2308.15052 | Naomichi Asakawa | Naomichi Asakawa and Yuichiro Sekiguchi | Constraining self-interactions of a massive scalar field using scalar
gravitational waves from stellar core collapse | 16 pages, 16 figures, 1 table | Phys. Rev. D 108, 044060 (2023) | 10.1103/PhysRevD.108.044060 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a comprehensive numerical study of gravitational waves from
stellar core collapse in the massive scalar-tensor theory with the cubic and
quartic self-interactions of the scalar field. We investigate the dependence of
gravitational waves on the self-interaction as well as the mass of the scalar
field and th... | [
{
"created": "Tue, 29 Aug 2023 06:27:20 GMT",
"version": "v1"
}
] | 2023-08-30 | [
[
"Asakawa",
"Naomichi",
""
],
[
"Sekiguchi",
"Yuichiro",
""
]
] | We perform a comprehensive numerical study of gravitational waves from stellar core collapse in the massive scalar-tensor theory with the cubic and quartic self-interactions of the scalar field. We investigate the dependence of gravitational waves on the self-interaction as well as the mass of the scalar field and the ... |
1904.11760 | Bibhas Majhi Ranjan | Surojit Dalui, Bibhas Ranjan Majhi, Pankaj Mishra | Induction of chaotic fluctuations in particle dynamics in a uniformly
accelerated frame | Comments added, to appear in Int. J. Mod. Phys. A | Int. J. Mod. Phys. A35 (2020) 2050081 | 10.1142/S0217751X20500815 | null | gr-qc astro-ph.GA hep-th nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ongoing conjecture that the presence of horizon may induce chaos in an
integrable system, is further investigated from the perspective of a uniformly
accelerated frame. Particularly, we build up a model which consists of a
particle (massless and chargeless) trapped in harmonic oscillator in a
uniformly accelerate... | [
{
"created": "Fri, 26 Apr 2019 11:03:07 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2020 11:30:32 GMT",
"version": "v2"
}
] | 2020-06-17 | [
[
"Dalui",
"Surojit",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
],
[
"Mishra",
"Pankaj",
""
]
] | The ongoing conjecture that the presence of horizon may induce chaos in an integrable system, is further investigated from the perspective of a uniformly accelerated frame. Particularly, we build up a model which consists of a particle (massless and chargeless) trapped in harmonic oscillator in a uniformly accelerated ... |
2007.11239 | Donato Bini | Donato Bini, Thibault Damour, Andrea Geralico | Sixth post-Newtonian nonlocal-in-time dynamics of binary systems | 59 pages, no figures, one ancillary text file | Phys. Rev. D 102, 084047 (2020) | 10.1103/PhysRevD.102.084047 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We complete our previous derivation, at the sixth post-Newtonian (6PN)
accuracy, of the local-in-time dynamics of a gravitationally interacting
two-body system by giving two gauge-invariant characterizations of its
complementary nonlocal-in-time dynamics. On the one hand, we compute the
nonlocal part of the scatterin... | [
{
"created": "Wed, 22 Jul 2020 07:44:42 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
],
[
"Geralico",
"Andrea",
""
]
] | We complete our previous derivation, at the sixth post-Newtonian (6PN) accuracy, of the local-in-time dynamics of a gravitationally interacting two-body system by giving two gauge-invariant characterizations of its complementary nonlocal-in-time dynamics. On the one hand, we compute the nonlocal part of the scattering ... |
1301.7609 | Ivan Arraut | Ivan Arraut | Relative locality and relative Co-locality as extensions of the
Generalized Uncertainty Principle | Abstract modified and some small changes done for making the
manuscript more understandable. 15 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I introduce the spatial curvature effects inside the formalism of Relative
Locality as a non-commutative structure of the momentum space in agreement with
the very well known concepts of Quantum Groups. This gives a natural red-shift
effect in agreement with an extended version of the Generalized Uncertainty
Principl... | [
{
"created": "Thu, 31 Jan 2013 13:24:32 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2013 10:14:05 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Jul 2013 10:26:05 GMT",
"version": "v3"
},
{
"created": "Mon, 18 Nov 2013 13:31:02 GMT",
"version": "v4"
}
] | 2013-11-19 | [
[
"Arraut",
"Ivan",
""
]
] | I introduce the spatial curvature effects inside the formalism of Relative Locality as a non-commutative structure of the momentum space in agreement with the very well known concepts of Quantum Groups. This gives a natural red-shift effect in agreement with an extended version of the Generalized Uncertainty Principle ... |
gr-qc/9812008 | David Polarski | David Polarski | Primordial Fluctuations from Inflation: a Consistent Histories Approach | LaTeX (7 pages), to appear in Phys. Lett. B | Phys.Lett.B446:53-57,1999 | 10.1016/S0370-2693(98)01533-0 | LMPT 10/98 | gr-qc astro-ph hep-th quant-ph | null | We show how the quantum-to-classical transition of the cosmological
fluctuations produced during an inflationary stage can be described using the
consistent histories approach. We identify the corresponding histories in the
limit of infinite squeezing. To take the decaying mode into account, we propose
an extension t... | [
{
"created": "Wed, 2 Dec 1998 15:25:49 GMT",
"version": "v1"
}
] | 2009-05-20 | [
[
"Polarski",
"David",
""
]
] | We show how the quantum-to-classical transition of the cosmological fluctuations produced during an inflationary stage can be described using the consistent histories approach. We identify the corresponding histories in the limit of infinite squeezing. To take the decaying mode into account, we propose an extension to ... |
1606.08058 | Bernhard Brehm | Bernhard Brehm | Bianchi VIII and IX vacuum cosmologies: Almost every solution forms
particle horizons and converges to the Mixmaster attractor | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | Bianchi models are posited by the BKL picture to be essential building blocks
towards an understanding of generic cosmological singularities. We study the
behaviour of spatially homogeneous anisotropic vacuum spacetimes of Bianchi
type VIII and IX, as they approach the big bang singularity. It is known since
2001 tha... | [
{
"created": "Sun, 26 Jun 2016 17:31:33 GMT",
"version": "v1"
}
] | 2016-06-28 | [
[
"Brehm",
"Bernhard",
""
]
] | Bianchi models are posited by the BKL picture to be essential building blocks towards an understanding of generic cosmological singularities. We study the behaviour of spatially homogeneous anisotropic vacuum spacetimes of Bianchi type VIII and IX, as they approach the big bang singularity. It is known since 2001 that ... |
1308.0197 | Anil Yadav dr | Ahmad T Ali, Anil Kumar Yadav and S R Mahmoud | Some Plane Symmetric Inhomogeneous Cosmological Models in the
Scalar-Tensor Theory of Gravitation | 12 pages, 1 figures | Astrophys. Space Sci. 349: 539-547 (2014) | 10.1007/s10509-013-1624-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present study deals with the inhomogeneous plane symmetric models in
scalar - tensor theory of gravitation. We used symmetry group analysis method
to solve the field equations analytically. A new class of similarity solutions
have been obtained by considering the inhomogeneous nature of metric potential.
The phys... | [
{
"created": "Wed, 31 Jul 2013 16:16:45 GMT",
"version": "v1"
}
] | 2013-12-12 | [
[
"Ali",
"Ahmad T",
""
],
[
"Yadav",
"Anil Kumar",
""
],
[
"Mahmoud",
"S R",
""
]
] | The present study deals with the inhomogeneous plane symmetric models in scalar - tensor theory of gravitation. We used symmetry group analysis method to solve the field equations analytically. A new class of similarity solutions have been obtained by considering the inhomogeneous nature of metric potential. The physic... |
gr-qc/0102084 | S. Antoci | S. Antoci and D.-E. Liebscher | Reconsidering Schwarzschild's original solution | 9 pages, added references and a remark on the norm of the timelike
Killing vector. Accepted for publication by Astronomische Nachrichten | Astron.Nachr. 322 (2001) 137-142 | 10.1002/1521-3994(200107)322:3<137::AID-ASNA137>3.0.CO;2-1 | null | gr-qc astro-ph | null | We analyse the Schwarzschild solution in the context of the historical
development of its present use, and explain the invariant definition of a
singular surface at the Schwarzschild's radius, that can be applied to the
Kerr-Newman solution too.
| [
{
"created": "Mon, 19 Feb 2001 15:28:55 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2001 09:49:47 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Antoci",
"S.",
""
],
[
"Liebscher",
"D. -E.",
""
]
] | We analyse the Schwarzschild solution in the context of the historical development of its present use, and explain the invariant definition of a singular surface at the Schwarzschild's radius, that can be applied to the Kerr-Newman solution too. |
2403.05421 | Claudio Aravena Cap | Claudio Aravena-Plaza, V\'ictor Mu\~noz and Felipe A. Asenjo | Accelerating Airy tensor modes of cosmological gravitational waves | 5 pages, 2 figures. arXiv admin note: text overlap with
arXiv:2304.14222 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | From a classical analysis, it is shown that the nondiffractive accelerating
gravitational Airy wave packets are solutions of Einstein equations for their
linearized tensor modes in a Friedmann-Lema\^itre-Robertson-Walker cosmological
background filled with a perfect fluid, with equations of state $w=1/3$ and
$w=-1/3$... | [
{
"created": "Fri, 8 Mar 2024 16:19:33 GMT",
"version": "v1"
}
] | 2024-03-11 | [
[
"Aravena-Plaza",
"Claudio",
""
],
[
"Muñoz",
"Víctor",
""
],
[
"Asenjo",
"Felipe A.",
""
]
] | From a classical analysis, it is shown that the nondiffractive accelerating gravitational Airy wave packets are solutions of Einstein equations for their linearized tensor modes in a Friedmann-Lema\^itre-Robertson-Walker cosmological background filled with a perfect fluid, with equations of state $w=1/3$ and $w=-1/3$. ... |
1509.00492 | Zoltan Keresztes | Zolt\'an Keresztes, L\'aszl\'o \'A. Gergely, Tiberiu Harko, and
Shi-Dong Liang | Cosmological constraints on superconducting dark energy models | 12 pages, 10 figures | Phys. Rev. D 92, 123503 (2015) | 10.1103/PhysRevD.92.123503 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider cosmological tests of a scalar-vector-tensor gravitational model,
in which the dark energy is included in the total action through a gauge
invariant, electromagnetic type contribution. The ground state of dark energy,
corresponding to a constant potential $V$ is a Bose-Einstein type condensate
with sponta... | [
{
"created": "Tue, 1 Sep 2015 20:22:48 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Dec 2015 23:48:20 GMT",
"version": "v2"
}
] | 2015-12-08 | [
[
"Keresztes",
"Zoltán",
""
],
[
"Gergely",
"László Á.",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Liang",
"Shi-Dong",
""
]
] | We consider cosmological tests of a scalar-vector-tensor gravitational model, in which the dark energy is included in the total action through a gauge invariant, electromagnetic type contribution. The ground state of dark energy, corresponding to a constant potential $V$ is a Bose-Einstein type condensate with spontane... |
0906.2170 | Llu\'is Bel | Ll. Bel, J. Martin-Martin | About the mass problem | Latex, 12 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of {\it active gravitational mass}, its definition and its
relation with the sources of a gravitational field, was clearly established by
Tolman in 1934. On the contrary, and surprisingly in our opinion, the concept
of {\it proper mass} has remained obscure in General relativity. We compare a
new definiti... | [
{
"created": "Thu, 11 Jun 2009 17:53:06 GMT",
"version": "v1"
}
] | 2009-06-12 | [
[
"Bel",
"Ll.",
""
],
[
"Martin-Martin",
"J.",
""
]
] | The concept of {\it active gravitational mass}, its definition and its relation with the sources of a gravitational field, was clearly established by Tolman in 1934. On the contrary, and surprisingly in our opinion, the concept of {\it proper mass} has remained obscure in General relativity. We compare a new definition... |
1103.3767 | Llu\'is Bel | Ll. Bel | Space and Time models | 11 pages, minor changes, an error in an intermediate step of the
derivation of (40) has been corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive line-element's templates of space-time models with Space models
complying with Helmholtz's Free mobility postulate, and discuss some of the
Time models compatible with them.
| [
{
"created": "Sat, 19 Mar 2011 09:31:58 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Apr 2011 09:30:56 GMT",
"version": "v2"
}
] | 2011-04-12 | [
[
"Bel",
"Ll.",
""
]
] | We derive line-element's templates of space-time models with Space models complying with Helmholtz's Free mobility postulate, and discuss some of the Time models compatible with them. |
1302.2687 | Prado Martin-Moruno | Prado Martin-Moruno (Victoria University of Wellington), Valentina
Baccetti (Victoria University of Wellington), and Matt Visser (Victoria
University of Wellington) | Massive gravity as a limit of bimetric gravity | 3 pages; contribution to the proceedings of the Thirteenth Marcel
Grossmann Meeting, Stockholm University, Sweden, 1-7 July, 2012 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Massive gravity may be viewed as a suitable limit of bimetric gravity. The
limiting procedure can lead to an interesting interplay between the
"background" and "foreground" metrics in a cosmological context. The fact that
in bimetric theories one always has two sets of metric equations of motion
continues to have an ... | [
{
"created": "Tue, 12 Feb 2013 02:48:21 GMT",
"version": "v1"
}
] | 2013-02-13 | [
[
"Martin-Moruno",
"Prado",
"",
"Victoria University of Wellington"
],
[
"Baccetti",
"Valentina",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria\n University of Wellington"
]
] | Massive gravity may be viewed as a suitable limit of bimetric gravity. The limiting procedure can lead to an interesting interplay between the "background" and "foreground" metrics in a cosmological context. The fact that in bimetric theories one always has two sets of metric equations of motion continues to have an ef... |
1604.01663 | Aur\'elien Hees | C. Le Poncin-Lafitte and A. Hees and S. lambert | Lorentz symmetry and Very Long Baseline Interferometry | 5 pages, 3 figures, version accepted for publication | Phys. Rev. D 94, 125030 (2016) | 10.1103/PhysRevD.94.125030 | null | gr-qc astro-ph.EP hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lorentz symmetry violations can be described by an effective field theory
framework that contains both General Relativity and the Standard Model of
particle physics called the Standard-Model extension (SME). Recently, post-fit
analysis of Gravity Probe B and binary pulsars lead to an upper limit at the
$10^{-4}$ leve... | [
{
"created": "Wed, 6 Apr 2016 15:39:54 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Dec 2016 15:42:36 GMT",
"version": "v2"
}
] | 2017-01-04 | [
[
"Poncin-Lafitte",
"C. Le",
""
],
[
"Hees",
"A.",
""
],
[
"lambert",
"S.",
""
]
] | Lorentz symmetry violations can be described by an effective field theory framework that contains both General Relativity and the Standard Model of particle physics called the Standard-Model extension (SME). Recently, post-fit analysis of Gravity Probe B and binary pulsars lead to an upper limit at the $10^{-4}$ level ... |
gr-qc/0304046 | Ruth Lazkoz | J.M. Aguirregabiria and Ruth Lazkoz | Anisotropic brane cosmologies with exponential potentials | 11 pages, 1 figure | Int.J.Mod.Phys. D13 (2004) 539-554 | 10.1142/S0218271804003846 | null | gr-qc | null | We study Bianchi I type brane cosmologies with scalar matter self-interacting
through combinations of exponential potentials. Such models correspond in some
cases to inflationary universes. We discuss the conditions for accelerated
expansion to occur, and pay particular attention to the influence of extra
dimensions ... | [
{
"created": "Fri, 11 Apr 2003 08:02:40 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Mar 2004 18:13:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Aguirregabiria",
"J. M.",
""
],
[
"Lazkoz",
"Ruth",
""
]
] | We study Bianchi I type brane cosmologies with scalar matter self-interacting through combinations of exponential potentials. Such models correspond in some cases to inflationary universes. We discuss the conditions for accelerated expansion to occur, and pay particular attention to the influence of extra dimensions an... |
gr-qc/0204032 | Sanjeev S. Seahra | Sanjeev S. Seahra | The Dynamics of Test Particles and Pointlike Gyroscopes in the Brane
World and Other 5D Models | 13 pages, 2 figures, in press in Phys. Rev. D | Phys.Rev. D65 (2002) 124004 | 10.1103/PhysRevD.65.124004 | null | gr-qc | null | We study the dynamics of test particles and pointlike gyroscopes in 5D
manifolds like those used in the Randall-Sundrum brane world and non-compact
Kaluza-Klein models. Our analysis is based on a covariant foliation of the
manifold using 3+1 dimensional spacetime slices orthogonal to the extra
dimension, and is hence... | [
{
"created": "Mon, 8 Apr 2002 01:19:25 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Seahra",
"Sanjeev S.",
""
]
] | We study the dynamics of test particles and pointlike gyroscopes in 5D manifolds like those used in the Randall-Sundrum brane world and non-compact Kaluza-Klein models. Our analysis is based on a covariant foliation of the manifold using 3+1 dimensional spacetime slices orthogonal to the extra dimension, and is hence s... |
gr-qc/9405025 | null | Jose P. Mimoso and David Wands | Massless Fileds in Scalar-Tensor Cosmologies | 24 pages (5 figures available on request from
dwands@star.susx.ac.uk), LaTeX with REVTeX macros, SUSSEX-AST-94/4-1 | Phys.Rev.D51:477-489,1995 | 10.1103/PhysRevD.51.477 | null | gr-qc | null | We derive exact Friedmann--Robertson--Walker cosmological solutions in
general scalar--tensor gravity theories, including Brans--Dicke gravity, for
stiff matter or radiation. These correspond to the long or short wavelength
modes respectively of massless scalar fields. If present, the long wavelength
modes of such fi... | [
{
"created": "Tue, 10 May 1994 15:53:00 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Mimoso",
"Jose P.",
""
],
[
"Wands",
"David",
""
]
] | We derive exact Friedmann--Robertson--Walker cosmological solutions in general scalar--tensor gravity theories, including Brans--Dicke gravity, for stiff matter or radiation. These correspond to the long or short wavelength modes respectively of massless scalar fields. If present, the long wavelength modes of such fiel... |
1209.2015 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | Necessary conditions for having wormholes in f(R) gravity | 7 pages, 1 figure | Mod. Phys. Lett. A, 31, 1650203 (2016); Mod. Phys. Lett. A, 31,
1650192 (2016) | 10.1142/S0217732316501923 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a generic $f(R)$ which admits a polynomial expansion of at least third
order (i.e. $\frac{d^{3}f}{dR^{3}}\neq 0$) we find the near-throat wormhole
solution. Necessary conditions for the existence of wormholes in such $f(R)$
theories are derived for both zero and non-zero matter sources. A particular
choice of ene... | [
{
"created": "Fri, 7 Sep 2012 14:06:25 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2012 08:01:51 GMT",
"version": "v2"
}
] | 2016-11-15 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | For a generic $f(R)$ which admits a polynomial expansion of at least third order (i.e. $\frac{d^{3}f}{dR^{3}}\neq 0$) we find the near-throat wormhole solution. Necessary conditions for the existence of wormholes in such $f(R)$ theories are derived for both zero and non-zero matter sources. A particular choice of energ... |
1410.5736 | Yuri Pavlov | A. A. Grib, Yu. V. Pavlov | Are black holes totally black? | 6 pages, 1 figure | Gravitation and Cosmology 21 (2015), 13-18 | 10.1134/S0202289315010065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geodesic completeness needs existence near the horizon of the black hole of
"white hole" geodesics coming from the region inside of the horizon. Here we
give the classification of all such geodesics with the energies $E/m \le 1$ for
the Schwarzschild and Kerr's black hole. The collisions of particles moving
along the... | [
{
"created": "Tue, 21 Oct 2014 16:42:16 GMT",
"version": "v1"
}
] | 2015-03-10 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | Geodesic completeness needs existence near the horizon of the black hole of "white hole" geodesics coming from the region inside of the horizon. Here we give the classification of all such geodesics with the energies $E/m \le 1$ for the Schwarzschild and Kerr's black hole. The collisions of particles moving along the "... |
gr-qc/0307104 | Jose' P. S. Lemos | Vitor Cardoso, Jose' P. S. Lemos, Shijun Yoshida | Electromagnetic radiation from collisions at almost the speed of light:
an extremely relativistic charged particle falling into a Schwarzschild black
hole | 6 pages, 2 figures | Phys.Rev. D68 (2003) 084011 | 10.1103/PhysRevD.68.084011 | null | gr-qc astro-ph hep-ph hep-th | null | We investigate the electromagnetic radiation released during the high energy
collision of a charged point particle with a four-dimensional Schwarzschild
black hole. We show that the spectra is flat, and well described by a classical
calculation. We also compare the total electromagnetic and gravitational
energies emi... | [
{
"created": "Wed, 23 Jul 2003 22:24:58 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Cardoso",
"Vitor",
""
],
[
"Lemos",
"Jose' P. S.",
""
],
[
"Yoshida",
"Shijun",
""
]
] | We investigate the electromagnetic radiation released during the high energy collision of a charged point particle with a four-dimensional Schwarzschild black hole. We show that the spectra is flat, and well described by a classical calculation. We also compare the total electromagnetic and gravitational energies emitt... |
2011.04550 | Beatriz Elizaga Navascu\'es | Jer\'onimo Cortez, Beatriz Elizaga Navascu\'es, Guillermo A. Mena
Marug\'an, Santiago Prado, and Jos\'e M. Velhinho | Uniqueness Criteria for the Fock Quantization of Dirac Fields and
Applications in Hybrid Loop Quantum Cosmology | 48 pages | Universe 2020, 6(12), 241 | 10.3390/universe6120241 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In generic curved spacetimes, the unavailability of a natural choice of
vacuum state introduces a serious ambiguity in the Fock quantization of fields.
In this review, we study the case of fermions described by a Dirac field in
several cosmological spacetimes, and present recent results about
well-motivated criteria ... | [
{
"created": "Mon, 9 Nov 2020 16:49:19 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jun 2021 06:08:40 GMT",
"version": "v2"
}
] | 2021-06-02 | [
[
"Cortez",
"Jerónimo",
""
],
[
"Navascués",
"Beatriz Elizaga",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
],
[
"Prado",
"Santiago",
""
],
[
"Velhinho",
"José M.",
""
]
] | In generic curved spacetimes, the unavailability of a natural choice of vacuum state introduces a serious ambiguity in the Fock quantization of fields. In this review, we study the case of fermions described by a Dirac field in several cosmological spacetimes, and present recent results about well-motivated criteria th... |
1206.0728 | Dennis Bessada | Dennis Bessada | Non-Gaussian signatures of Tachyacoustic Cosmology | Some comments and references added. Matches the version published in
JCAP | null | 10.1088/1475-7516/2012/09/018 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I investigate non-Gaussian signatures in the context of tachyacoustic
cosmology, that is, a noninflationary model with superluminal speed of sound. I
calculate the full non-Gaussian amplitude $\mathcal{A}$, its size $f_{\rm NL}$,
and corresponding shapes for a red-tilted spectrum of primordial scalar
perturbations. S... | [
{
"created": "Sat, 2 Jun 2012 19:58:52 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Sep 2012 02:06:52 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Bessada",
"Dennis",
""
]
] | I investigate non-Gaussian signatures in the context of tachyacoustic cosmology, that is, a noninflationary model with superluminal speed of sound. I calculate the full non-Gaussian amplitude $\mathcal{A}$, its size $f_{\rm NL}$, and corresponding shapes for a red-tilted spectrum of primordial scalar perturbations. Spe... |
2105.05666 | Rolando Gaitan Deveras RGD | Rolando Gaitan and Yessica Dominguez | Elements of the Metric-Affine Gravity I: Aspects of F(R) theories
reductions and the Topologically Massive Gravity | 42 pages, 1 figure | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Some classical aspects of Metric-Affine Gravity are reviewed in the context
of the $F^{(n)}(R)$ type models (polynomials of degree $n$ in the Riemann
tensor) and the topologically massive gravity. At the non-perturbative level,
we explore the consistency of the field equations when the $F^{(n)}(R)$ models
are reduced... | [
{
"created": "Wed, 12 May 2021 13:56:13 GMT",
"version": "v1"
}
] | 2021-05-13 | [
[
"Gaitan",
"Rolando",
""
],
[
"Dominguez",
"Yessica",
""
]
] | Some classical aspects of Metric-Affine Gravity are reviewed in the context of the $F^{(n)}(R)$ type models (polynomials of degree $n$ in the Riemann tensor) and the topologically massive gravity. At the non-perturbative level, we explore the consistency of the field equations when the $F^{(n)}(R)$ models are reduced t... |
2402.05049 | Soichiro Isoyama | Paul Ramond and Soichiro Isoyama | Symplectic mechanics of relativistic spinning compact bodies II.:
Canonical formalism in the Schwarzschild spacetime | 69 pages, 3 figures, 2 tables. V2: minor revisions before submission
to PRD. added references | null | null | null | gr-qc nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work constitutes the second part of a series of studies that aim to
utilise tools from Hamiltonian mechanics to investigate the motion of an
extended body in general relativity. The first part of this work [Refs. [1, 2]]
constructed a ten-dimensional, covariant Hamiltonian framework encompassing all
the linear-i... | [
{
"created": "Wed, 7 Feb 2024 17:41:44 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2024 04:09:36 GMT",
"version": "v2"
}
] | 2024-05-07 | [
[
"Ramond",
"Paul",
""
],
[
"Isoyama",
"Soichiro",
""
]
] | This work constitutes the second part of a series of studies that aim to utilise tools from Hamiltonian mechanics to investigate the motion of an extended body in general relativity. The first part of this work [Refs. [1, 2]] constructed a ten-dimensional, covariant Hamiltonian framework encompassing all the linear-in-... |
2408.05668 | Shin'ichi Nojiri | Shin'ichi Nojiri and Sergei D. Odintsov | Improving Mimetic Gravity with Non-trivial Scalar Potential: Cosmology,
Black Holes, Shadow and Photon Sphere | LaTeX, 32 pages, no figure | null | null | KEK-TH-2645, KEK-Cosmo-0353 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is not easy to treat the spacetime with horizon(s) in the standard mimetic
gravity. The solution to this problem has been presented in Phys.~Lett.~B 830
(2022), 137140, where it was suggested to modify the Lagrange multiplier
constraint.
In this paper, by using the improved formulation, we investigate the
cosmol... | [
{
"created": "Sun, 11 Aug 2024 01:15:39 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | It is not easy to treat the spacetime with horizon(s) in the standard mimetic gravity. The solution to this problem has been presented in Phys.~Lett.~B 830 (2022), 137140, where it was suggested to modify the Lagrange multiplier constraint. In this paper, by using the improved formulation, we investigate the cosmology ... |
gr-qc/0307100 | Nicolas Arnaud | Nicolas Arnaud, Matteo Barsuglia, Marie-Anne Bizouard, Violette
Brisson, Fabien Cavalier, Michel Davier, Patrice Hello, Stephane
Kreckelbergh, Edward K. Porter | Coincidence and coherent data analysis methods for gravitational wave
bursts in a network of interferometric detectors | Spelling mistake corrected in one author's name | Phys.Rev. D68 (2003) 102001 | 10.1103/PhysRevD.68.102001 | null | gr-qc | null | Network data analysis methods are the only way to properly separate real
gravitational wave (GW) transient events from detector noise. They can be
divided into two generic classes: the coincidence method and the coherent
analysis. The former uses lists of selected events provided by each
interferometer belonging to t... | [
{
"created": "Wed, 23 Jul 2003 16:08:06 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Sep 2003 11:32:11 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Sep 2003 12:17:25 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Arnaud",
"Nicolas",
""
],
[
"Barsuglia",
"Matteo",
""
],
[
"Bizouard",
"Marie-Anne",
""
],
[
"Brisson",
"Violette",
""
],
[
"Cavalier",
"Fabien",
""
],
[
"Davier",
"Michel",
""
],
[
"Hello",
"Patrice",
""
... | Network data analysis methods are the only way to properly separate real gravitational wave (GW) transient events from detector noise. They can be divided into two generic classes: the coincidence method and the coherent analysis. The former uses lists of selected events provided by each interferometer belonging to the... |
1111.3858 | Mubasher Jamil | Ujjal Debnath, Surajit Chattopadhyay, Ibrar Hussain, Mubasher Jamil,
Ratbay Myrzakulov | Generalized Second Law of Thermodynamics for FRW Cosmology with
Power-Law Entropy Correction | 10 pages | Eur. Phys. J. C (2012) 72:1875 | 10.1140/epjc/s10052-012-1875-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have considered the power law correction of entropy on the
horizon. If the flat FRW Universe is filled with the n components fluid with
interactions, the GSL of thermodynamics for apparent and event horizons have
been investigated for equilibrium and non-equilibrium cases. If we consider a
small pert... | [
{
"created": "Tue, 15 Nov 2011 08:26:58 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2012 04:50:38 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Feb 2012 11:02:07 GMT",
"version": "v3"
}
] | 2012-07-03 | [
[
"Debnath",
"Ujjal",
""
],
[
"Chattopadhyay",
"Surajit",
""
],
[
"Hussain",
"Ibrar",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | In this work, we have considered the power law correction of entropy on the horizon. If the flat FRW Universe is filled with the n components fluid with interactions, the GSL of thermodynamics for apparent and event horizons have been investigated for equilibrium and non-equilibrium cases. If we consider a small pertur... |
gr-qc/0101005 | Valery Gavrilov | V.R. Gavrilov and V.N. Melnikov | X-fluid and viscous fluid in D-dimensional anisotropic integrable
cosmology | 11 pages, Latex 2.09 | null | null | null | gr-qc | null | D-dimensional cosmological model describing the evolution of a perfect fluid
with negative pressure (x-fluid) and a fluid possessing both shear and bulk
viscosity in n Ricci-flat spaces is investigated. The second equations of state
are chosen in some special form of metric dependence of the shear and bulk
viscosity ... | [
{
"created": "Sat, 30 Dec 2000 17:09:59 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2001 21:00:59 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Gavrilov",
"V. R.",
""
],
[
"Melnikov",
"V. N.",
""
]
] | D-dimensional cosmological model describing the evolution of a perfect fluid with negative pressure (x-fluid) and a fluid possessing both shear and bulk viscosity in n Ricci-flat spaces is investigated. The second equations of state are chosen in some special form of metric dependence of the shear and bulk viscosity co... |
2208.07324 | Serguei Krasnikov | Serguei Krasnikov | A causality preserving evolution of a pair of strings | More details | Universe 8 (2022) 640 | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | As shown by Gott, a pair of straight cosmic strings moving in opposite
directions, when they have suitable speed and impact parameter, produce closed
timelike curves.
I argue in this paper that there always is a not-so-frightening alternative:
the Universe may prefer to produce a certain (surprisingly simple and
ab... | [
{
"created": "Mon, 15 Aug 2022 16:42:21 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Dec 2022 16:03:26 GMT",
"version": "v2"
}
] | 2022-12-02 | [
[
"Krasnikov",
"Serguei",
""
]
] | As shown by Gott, a pair of straight cosmic strings moving in opposite directions, when they have suitable speed and impact parameter, produce closed timelike curves. I argue in this paper that there always is a not-so-frightening alternative: the Universe may prefer to produce a certain (surprisingly simple and absolu... |
1307.1097 | Henrique de Andrade Gomes | Henrique Gomes | A construction principle for ADM-type theories in maximal slicing gauge | 14 pages, updated references, matches version submitted to Phys. Rev.
D | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The differing concepts of time in general relativity and quantum mechanics
are widely accused as the main culprits in our persistent failure in finding a
complete theory of quantum gravity. Here we address this issue by constructing
ADM-type theories \emph{in a particular time gauge} directly from first
principles. T... | [
{
"created": "Wed, 3 Jul 2013 18:05:57 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2013 18:37:27 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Oct 2013 08:18:50 GMT",
"version": "v3"
}
] | 2013-10-08 | [
[
"Gomes",
"Henrique",
""
]
] | The differing concepts of time in general relativity and quantum mechanics are widely accused as the main culprits in our persistent failure in finding a complete theory of quantum gravity. Here we address this issue by constructing ADM-type theories \emph{in a particular time gauge} directly from first principles. The... |
0904.1272 | Dario Zappala | M. Consoli | Ultraweak excitations of the quantum vacuum as physical models of
gravity | 30 pages, no figures, accepted by Classical and Quantum Gravity | Class.Quant.Grav.26:225008,2009 | 10.1088/0264-9381/26/22/225008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been argued by several authors that the space-time curvature observed
in gravitational fields, and the same idea of forms of physical equivalence
different from the Lorentz group, might emerge from the dynamical properties of
the physical flat-space vacuum in a suitable hydrodynamic limit. To explore
this idea... | [
{
"created": "Wed, 8 Apr 2009 07:22:05 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Sep 2009 09:52:44 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Consoli",
"M.",
""
]
] | It has been argued by several authors that the space-time curvature observed in gravitational fields, and the same idea of forms of physical equivalence different from the Lorentz group, might emerge from the dynamical properties of the physical flat-space vacuum in a suitable hydrodynamic limit. To explore this idea, ... |
1103.1220 | Suat Dengiz | Suat Dengiz | 3+1 Orthogonal and Conformal Decomposition of the Einstein Equation and
the ADM Formalism for General Relativity | M. Sc. Thesis, 88 pages, 6 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, two particular orthogonal and conformal decompositions of the
3+1 dimensional Einstein equation and Arnowitt-Deser-Misner (ADM) formalism for
general relativity are obtained. In order to do these, the 3+1 foliation of the
four-dimensional spacetime, the fundamental conformal transformations and the
Hami... | [
{
"created": "Mon, 7 Mar 2011 09:45:40 GMT",
"version": "v1"
}
] | 2011-03-08 | [
[
"Dengiz",
"Suat",
""
]
] | In this work, two particular orthogonal and conformal decompositions of the 3+1 dimensional Einstein equation and Arnowitt-Deser-Misner (ADM) formalism for general relativity are obtained. In order to do these, the 3+1 foliation of the four-dimensional spacetime, the fundamental conformal transformations and the Hamilt... |
1411.4057 | Laszlo Arpad Gergely | L\'aszl\'o \'Arp\'ad Gergely, Zolt\'an Keresztes | Spinning compact binary dynamics and chameleon orbits | to be published in Phys. Rev. D, 19 pages, 3 figure panels | Phys. Rev. D 91, 024012 (2015) | 10.1103/PhysRevD.91.024012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the conservative evolution of spinning compact binaries to second
post-Newtonian (2PN) order accuracy, with leading order spin-orbit, spin-spin
and mass quadrupole-monopole contributions included. As a main result we derive
a closed system of first order differential equations in a compact form, for a
set ... | [
{
"created": "Fri, 14 Nov 2014 21:07:48 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Dec 2014 07:19:48 GMT",
"version": "v2"
}
] | 2015-05-04 | [
[
"Gergely",
"László Árpád",
""
],
[
"Keresztes",
"Zoltán",
""
]
] | We analyse the conservative evolution of spinning compact binaries to second post-Newtonian (2PN) order accuracy, with leading order spin-orbit, spin-spin and mass quadrupole-monopole contributions included. As a main result we derive a closed system of first order differential equations in a compact form, for a set of... |
2407.00174 | Marius Adrian Oancea | Abraham I. Harte, Thomas B. Mieling, Marius A. Oancea, Florian
Steininger | Gravitational wave memory and its effects on particles and fields | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave memory is said to arise when a gravitational wave burst
produces changes in a physical system that persist even after that wave has
passed. This paper analyzes gravitational wave bursts in plane wave spacetimes,
deriving memory effects on timelike and null geodesics, massless scalar fields,
and mas... | [
{
"created": "Fri, 28 Jun 2024 18:23:32 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2024 17:12:08 GMT",
"version": "v2"
}
] | 2024-07-23 | [
[
"Harte",
"Abraham I.",
""
],
[
"Mieling",
"Thomas B.",
""
],
[
"Oancea",
"Marius A.",
""
],
[
"Steininger",
"Florian",
""
]
] | Gravitational wave memory is said to arise when a gravitational wave burst produces changes in a physical system that persist even after that wave has passed. This paper analyzes gravitational wave bursts in plane wave spacetimes, deriving memory effects on timelike and null geodesics, massless scalar fields, and massl... |
1412.1955 | Marco Frasca | Marco Frasca | Hawking radiation and interacting fields | 12 pages, 1 figure. Fixed some LaTeX and added references. Accepted
for publication in European Physical Journal Plus | Eur. Phys. J. Plus (2017) 132: 467 | 10.1140/epjp/i2017-11732-1 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking radiation is generally derived using a non-interacting field theory.
Some time ago, Leahy and Unruh showed that, in two dimensions with a
Schwarzschild geometry, a scalar field theory with a quartic interaction gets
the coupling switched off near the horizon of the black hole. This would imply
that interactio... | [
{
"created": "Fri, 5 Dec 2014 11:14:22 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Dec 2014 16:34:35 GMT",
"version": "v2"
},
{
"created": "Sun, 15 Oct 2017 14:05:33 GMT",
"version": "v3"
}
] | 2017-11-06 | [
[
"Frasca",
"Marco",
""
]
] | Hawking radiation is generally derived using a non-interacting field theory. Some time ago, Leahy and Unruh showed that, in two dimensions with a Schwarzschild geometry, a scalar field theory with a quartic interaction gets the coupling switched off near the horizon of the black hole. This would imply that interaction ... |
gr-qc/9801086 | Lior M. Burko | Amos Ori | Null weak singularities in plane-symmetric spacetimes | 17 pages, 2 PostScript figures, to appear in Phys. Rev. D | Phys.Rev. D57 (1998) 4745-4753 | 10.1103/PhysRevD.57.4745 | null | gr-qc | null | We construct a new class of plane-symmetric solutions possessing a curvature
singularity which is null and weak, like the spacetime singularity at the
Cauchy horizon of spinning (or charged) black holes. We then analyse the
stability of this singularity using a rigorous non-perturbative method. We find
that within th... | [
{
"created": "Mon, 26 Jan 1998 10:45:19 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ori",
"Amos",
""
]
] | We construct a new class of plane-symmetric solutions possessing a curvature singularity which is null and weak, like the spacetime singularity at the Cauchy horizon of spinning (or charged) black holes. We then analyse the stability of this singularity using a rigorous non-perturbative method. We find that within the ... |
gr-qc/0511133 | Bin Wang | Bin Wang | Perturbations around black holes | 14 pages, 4 figures, Invited plenary talk given in the Conference
"100 Years of Relativity", Sao Paulo, Brazil, August 2005 | Braz.J.Phys. 35 (2005) 1029-1037 | null | null | gr-qc | null | Perturbations around black holes have been an intriguing topic in the last
few decades. They are particularly important today, since they relate to the
gravitational wave observations which may provide the unique fingerprint of
black holes' existence. Besides the astrophysical interest, theoretically
perturbations ar... | [
{
"created": "Thu, 24 Nov 2005 15:31:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wang",
"Bin",
""
]
] | Perturbations around black holes have been an intriguing topic in the last few decades. They are particularly important today, since they relate to the gravitational wave observations which may provide the unique fingerprint of black holes' existence. Besides the astrophysical interest, theoretically perturbations arou... |
gr-qc/9802005 | Bruce Bassett | G. F. R. Ellis and D. M. Solomons (UCT) | Caustics of Compensated Spherical Lens Models | 21 pages, 5 ps figures, epsf | Class.Quant.Grav. 15 (1998) 2381-2396 | 10.1088/0264-9381/15/8/017 | null | gr-qc astro-ph | null | We consider compensated spherical lens models and the caustic surfaces they
create in the past light cone. Examination of cusp and crossover angles
associated with particular source and lens redshifts gives explicit lensing
models that confirm previous claims that area distances can differ by
substantial factors from... | [
{
"created": "Tue, 3 Feb 1998 00:18:55 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ellis",
"G. F. R.",
"",
"UCT"
],
[
"Solomons",
"D. M.",
"",
"UCT"
]
] | We consider compensated spherical lens models and the caustic surfaces they create in the past light cone. Examination of cusp and crossover angles associated with particular source and lens redshifts gives explicit lensing models that confirm previous claims that area distances can differ by substantial factors from a... |
gr-qc/9410040 | null | Piotr T. Chru\'sciel, Alan D. Rendall | Strong cosmic censorship in vacuum space--times with compact, locally
homogeneous Cauchy surfaces | Latex, 38 pages | Annals Phys. 242 (1995) 349-385 | 10.1006/aphy.1995.1084 | null | gr-qc | null | We consider the question of strong cosmic censorship in spatially compact,
spatially locally homogeneous vacuum models. We show in particular that strong
cosmic censorship holds in Bianchi IX vacuum space--times with spherical
spatial topology.
| [
{
"created": "Fri, 28 Oct 1994 13:53:48 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Oct 1994 18:15:13 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Rendall",
"Alan D.",
""
]
] | We consider the question of strong cosmic censorship in spatially compact, spatially locally homogeneous vacuum models. We show in particular that strong cosmic censorship holds in Bianchi IX vacuum space--times with spherical spatial topology. |
0912.4744 | Sean McWilliams | Sean T. McWilliams | Constraining the braneworld with gravitational wave observations | 4 pages, replaced with version published in Phys. Rev. Lett. | Phys.Rev.Lett.104:141601,2010 | 10.1103/PhysRevLett.104.141601 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some braneworld models may have observable consequences that, if detected,
would validate a requisite element of string theory. In the infinite
Randall-Sundrum model (RS2), the AdS radius of curvature, L, of the extra
dimension supports a single bound state of the massless graviton on the brane,
thereby reproducing N... | [
{
"created": "Wed, 23 Dec 2009 21:52:50 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Apr 2010 19:22:01 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"McWilliams",
"Sean T.",
""
]
] | Some braneworld models may have observable consequences that, if detected, would validate a requisite element of string theory. In the infinite Randall-Sundrum model (RS2), the AdS radius of curvature, L, of the extra dimension supports a single bound state of the massless graviton on the brane, thereby reproducing New... |
2405.12987 | Ivan Arraut Dr. | Ivan Arraut | Reply to the "Comment on The Tully-Fisher law and dark matter effects
derived via modified symmetries by I. Arraut" | 4 pages; reply to arXiv:2402.00081 | 2024 EPL 147 19002 | 10.1209/0295-5075/ad6180 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been claimed in \cite{1}, that the idea proposed in \cite{2} has
certain mistakes based on arguments of energy conditions and others.
Additionally, some of the key arguments of the paper are criticized. Here we
demonstrate that the results obtained in \cite{2} are correct and that there is
no violation of any ... | [
{
"created": "Tue, 2 Apr 2024 10:38:30 GMT",
"version": "v1"
}
] | 2024-07-19 | [
[
"Arraut",
"Ivan",
""
]
] | It has been claimed in \cite{1}, that the idea proposed in \cite{2} has certain mistakes based on arguments of energy conditions and others. Additionally, some of the key arguments of the paper are criticized. Here we demonstrate that the results obtained in \cite{2} are correct and that there is no violation of any en... |
2405.08895 | Ali Kaya | Ali Kaya | Time Evolution in Canonical Quantum Gravity is Trivial | 9 pages, v2: comments and references added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Wheeler-DeWitt equation does not describe any explicit time evolution of
the wave function, and somehow related to this issue, there is no natural way
of defining an invariant inner product that provides a viable probability
interpretation. We show that both of these difficulties are solved in a
covariant canonic... | [
{
"created": "Tue, 14 May 2024 18:13:02 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2024 14:17:11 GMT",
"version": "v2"
}
] | 2024-05-29 | [
[
"Kaya",
"Ali",
""
]
] | The Wheeler-DeWitt equation does not describe any explicit time evolution of the wave function, and somehow related to this issue, there is no natural way of defining an invariant inner product that provides a viable probability interpretation. We show that both of these difficulties are solved in a covariant canonical... |
1202.1905 | Deniz Olgu Devecioglu | Gokhan Alkac, Deniz Olgu Devecioglu | Covariant Symplectic Structure and Conserved Charges of New Massive
Gravity | 18 pages, No figures, RevTEX4.1; ver 2: minor corrections, version
accepted for publication in Physical Review D | Phys.RevD.85:064048,2012 | 10.1103/PhysRevD.85.064048 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the symplectic current obtained from the boundary term, which
arises in the first variation of a local diffeomorphism invariant action, is
covariantly conserved for any gravity theory described by that action.
Therefore, a Poincare invariant 2-form can be constructed on the phase space,
which is shown to... | [
{
"created": "Thu, 9 Feb 2012 08:04:16 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2012 12:29:58 GMT",
"version": "v2"
}
] | 2012-04-13 | [
[
"Alkac",
"Gokhan",
""
],
[
"Devecioglu",
"Deniz Olgu",
""
]
] | We show that the symplectic current obtained from the boundary term, which arises in the first variation of a local diffeomorphism invariant action, is covariantly conserved for any gravity theory described by that action. Therefore, a Poincare invariant 2-form can be constructed on the phase space, which is shown to b... |
2306.10273 | Gamal G.L. Nashed | G.G.L. Nashed | The effect of $f(R,T)$ modified gravity on mass and radius of pulsar
HerX1 | 22 pages, 10 figures, 3 tables | The Astrophysical Journal, 950:129 (2023) | 10.3847/1538-4357/acd182 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Recent findings from the Neutron Star Interior Composition Explorer (NICER)
have opened up opportunities to investigate the potential coupling between
matter and geometry, along with its resulting physical implications.
Millisecond pulsars serve as an ideal subject for conducting such tests and
examining these phenom... | [
{
"created": "Sat, 17 Jun 2023 06:38:22 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Nashed",
"G. G. L.",
""
]
] | Recent findings from the Neutron Star Interior Composition Explorer (NICER) have opened up opportunities to investigate the potential coupling between matter and geometry, along with its resulting physical implications. Millisecond pulsars serve as an ideal subject for conducting such tests and examining these phenomen... |
2010.09918 | P. M. Petryakova | P. M. Petryakova | Dynamics of a homogeneous and isotropic space in pure cubic f(R) gravity | null | Physics 2021, 3(2), 379-385 | 10.3390/physics3020027 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We consider a possible ways of the dynamics of a homogeneous and isotropic
space described by the FLRW metric in the framework of cubic f(R) gravity in
the absence of matter. This article points an method for limiting the
parameters of extended gravity models. We propose and develop a method for f(R)
gravity models b... | [
{
"created": "Mon, 19 Oct 2020 23:32:56 GMT",
"version": "v1"
},
{
"created": "Wed, 5 May 2021 16:17:06 GMT",
"version": "v2"
}
] | 2023-04-20 | [
[
"Petryakova",
"P. M.",
""
]
] | We consider a possible ways of the dynamics of a homogeneous and isotropic space described by the FLRW metric in the framework of cubic f(R) gravity in the absence of matter. This article points an method for limiting the parameters of extended gravity models. We propose and develop a method for f(R) gravity models bas... |
2302.12524 | Leandros Perivolaropoulos | L. Perivolaropoulos, I. Antoniou and D. Papadopoulos | Probing dark fluids and modified gravity with gravitational lensing | 9 pages, 4 Figures, 2 Tables. Published in MNRAS. The Mathematica
files used for the construction of Fig. 2 and 3 may be downloaded from
https://github.com/leandros11/lensing1 | null | 10.1093/mnras/stad1882 | null | gr-qc astro-ph.CO physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the Rindler-Ishak (2007) result for the lensing deflection
angle in a SdS spacetime, to the case of a general spherically symmetric fluid
beyond the cosmological constant. We thus derive an analytic expression to
first post-Newtonian order for the lensing deflection angle in a general static
spherically... | [
{
"created": "Fri, 24 Feb 2023 09:17:11 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2023 08:57:49 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Jun 2023 14:57:10 GMT",
"version": "v3"
}
] | 2023-06-28 | [
[
"Perivolaropoulos",
"L.",
""
],
[
"Antoniou",
"I.",
""
],
[
"Papadopoulos",
"D.",
""
]
] | We generalize the Rindler-Ishak (2007) result for the lensing deflection angle in a SdS spacetime, to the case of a general spherically symmetric fluid beyond the cosmological constant. We thus derive an analytic expression to first post-Newtonian order for the lensing deflection angle in a general static spherically s... |
1503.02956 | Kirill Bronnikov | K.A. Bronnikov and P.A. Korolyov | Magnetic wormholes and black universes with invisible ghosts | 9 pages, 5 figures | Grav. Cosmol. 21 (2), 157-165 (2015) | 10.1134/S0202289315020024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct explicit examples of globally regular static, spherically
symmetric solutions in general relativity with scalar and electromagnetic
fields describing traversable wormholes with flat and AdS asymptotics and
regular black holes, in particular, black universes. (A black universe is a
regular black hole with... | [
{
"created": "Tue, 10 Mar 2015 15:41:12 GMT",
"version": "v1"
}
] | 2015-09-07 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Korolyov",
"P. A.",
""
]
] | We construct explicit examples of globally regular static, spherically symmetric solutions in general relativity with scalar and electromagnetic fields describing traversable wormholes with flat and AdS asymptotics and regular black holes, in particular, black universes. (A black universe is a regular black hole with a... |
gr-qc/0108017 | Boris Grobov | Elena V. Palesheva | Ghost spinors, shadow electrons and the Deutsch Multiverse | 8 pages, LaTeX2e | null | null | null | gr-qc | null | In this article a new solution of the Einstein-Dirac's equations is
presented. There are ghost spinors, i.e. the stress-energy tensor is equal to
zero and the current of these fields is non-zero vector. Last the ghost
neutrino was found. These ghost spinors and shadow particles of Deutsch are
identified. And in resul... | [
{
"created": "Sun, 5 Aug 2001 15:39:49 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2001 18:25:54 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Palesheva",
"Elena V.",
""
]
] | In this article a new solution of the Einstein-Dirac's equations is presented. There are ghost spinors, i.e. the stress-energy tensor is equal to zero and the current of these fields is non-zero vector. Last the ghost neutrino was found. These ghost spinors and shadow particles of Deutsch are identified. And in result ... |
1005.2927 | Simone Speziale | Carlo Rovelli, Simone Speziale | On the geometry of loop quantum gravity on a graph | 6 pages, 1 figure. v2: some typos corrected, references updated | Phys.Rev.D82:044018,2010 | 10.1103/PhysRevD.82.044018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the meaning of geometrical constructions associated to loop
quantum gravity states on a graph. In particular, we discuss the "twisted
geometries" and derive a simple relation between these and Regge geometries.
| [
{
"created": "Mon, 17 May 2010 14:11:29 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Aug 2010 14:35:50 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Rovelli",
"Carlo",
""
],
[
"Speziale",
"Simone",
""
]
] | We discuss the meaning of geometrical constructions associated to loop quantum gravity states on a graph. In particular, we discuss the "twisted geometries" and derive a simple relation between these and Regge geometries. |
gr-qc/0401055 | Giovanni Imponente | Giovanni Imponente and Giovanni Montani | General Aspects of the de Sitter phase | 30 pages with cimento.cls, no figures, to appear on "Il Nuovo Cimento
B" | Nuovo Cim.B120:1085-1114,2005 | 10.1393/ncb/i2005-10142-0 | null | gr-qc astro-ph | null | We present a detailed discussion of the inflationary scenario in the context
of inhomogeneous cosmologies. After a review of the fundamental features
characterizing the inflationary model, as referred to a homogeneous and
isotropic Universe, we develop a generalization in view of including small
inhomogeneous correct... | [
{
"created": "Tue, 13 Jan 2004 12:05:38 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Imponente",
"Giovanni",
""
],
[
"Montani",
"Giovanni",
""
]
] | We present a detailed discussion of the inflationary scenario in the context of inhomogeneous cosmologies. After a review of the fundamental features characterizing the inflationary model, as referred to a homogeneous and isotropic Universe, we develop a generalization in view of including small inhomogeneous correctio... |
gr-qc/0401030 | Claudio Benedito Silva Furtado | A. M. de M. Carvalho, Fernando Moraes, Claudio Furtado | The self-energy of a charged particle in the presence of a topological
defect distribution | 12 pages, Revtex4, two figures,to appear in Int. Joun. Mod. Phys. A | Int.J.Mod.Phys. A19 (2004) 2113-2122 | 10.1142/S0217751X04018373 | null | gr-qc | null | In this work we study a charged particle in the presence of both a continuous
distribution of disclinations and a continuous distribution of edge
dislocations in the framework of the geometrical theory of defects. We obtain
the self-energy for a single charge both in the internal and external regions
of either distri... | [
{
"created": "Fri, 9 Jan 2004 11:32:21 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Carvalho",
"A. M. de M.",
""
],
[
"Moraes",
"Fernando",
""
],
[
"Furtado",
"Claudio",
""
]
] | In this work we study a charged particle in the presence of both a continuous distribution of disclinations and a continuous distribution of edge dislocations in the framework of the geometrical theory of defects. We obtain the self-energy for a single charge both in the internal and external regions of either distribu... |
1106.2054 | Jonathan Ziprick | C. Danielle Leonard, Jonathan Ziprick, Gabor Kunstatter and Robert B.
Mann | Gravitational collapse of K-essence Matter in Painlev\'{e}-Gullstrand
coordinates | 14 pages, 8 figures | null | 10.1007/JHEP10(2011)028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conduct numerical simulations in Painlev\'{e}-Gullstrand coordinates of a
variety of K-essence-type scalar fields under spherically symmetric
gravitational collapse. We write down generic conditions on the K-essence
lagrangian that can be used to determine whether superluminality and Cauchy
breakdown are possible.... | [
{
"created": "Fri, 10 Jun 2011 13:46:24 GMT",
"version": "v1"
}
] | 2012-05-15 | [
[
"Leonard",
"C. Danielle",
""
],
[
"Ziprick",
"Jonathan",
""
],
[
"Kunstatter",
"Gabor",
""
],
[
"Mann",
"Robert B.",
""
]
] | We conduct numerical simulations in Painlev\'{e}-Gullstrand coordinates of a variety of K-essence-type scalar fields under spherically symmetric gravitational collapse. We write down generic conditions on the K-essence lagrangian that can be used to determine whether superluminality and Cauchy breakdown are possible. C... |
gr-qc/0011039 | Steven Detweiler | Steven Detweiler | Radiation reaction and the self-force for a point mass in general
relativity | 4 pages, RevTex | Phys.Rev.Lett.86:1931-1934,2001 | 10.1103/PhysRevLett.86.1931 | null | gr-qc | null | A point particle of mass m moving on a geodesic creates a perturbation h, of
the spacetime metric g, that diverges at the particle. Simple expressions are
given for the singular m/r part of h and its quadrupole distortion caused by
the spacetime. Subtracting these from h leaves a remainder h^R that is C^1. The
self-f... | [
{
"created": "Sat, 11 Nov 2000 17:55:22 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Detweiler",
"Steven",
""
]
] | A point particle of mass m moving on a geodesic creates a perturbation h, of the spacetime metric g, that diverges at the particle. Simple expressions are given for the singular m/r part of h and its quadrupole distortion caused by the spacetime. Subtracting these from h leaves a remainder h^R that is C^1. The self-for... |
2101.01549 | Muhammad Sharif | M. Sharif and Amal Majid | Complexity of Dynamical Sphere in Self-interacting Brans-Dicke Gravity | 19 pages, no figure | Eur. Phys. J. C 80(2020)1185 | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | This paper aims to derive a definition of complexity for a dynamic spherical
system in the background of self-interacting Brans-Dicke gravity. We measure
complexity of the structure in terms of inhomogeneous energy density,
anisotropic pressure and massive scalar field. For this purpose, we formulate
structure scalar... | [
{
"created": "Fri, 1 Jan 2021 05:50:45 GMT",
"version": "v1"
}
] | 2021-01-06 | [
[
"Sharif",
"M.",
""
],
[
"Majid",
"Amal",
""
]
] | This paper aims to derive a definition of complexity for a dynamic spherical system in the background of self-interacting Brans-Dicke gravity. We measure complexity of the structure in terms of inhomogeneous energy density, anisotropic pressure and massive scalar field. For this purpose, we formulate structure scalars ... |
1903.06037 | Arman Stepanian | A. Stepanian | On the invalidity of "negative mass" description of the dark sector | "Mod. Phys. Lett. A, in press" | Mod. Phys.Lett. A, 34, 1975002 (2019) | 10.1142/S0217732319750026 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the concept of "negative mass" introduced by Farnes (2018)
to describe the dark sector within a unifying theory with the negative
cosmological constant contradicts both the essence of the General Relativity
and the available observational data. A viable model with modified weak-field
General Relativi... | [
{
"created": "Wed, 13 Mar 2019 14:45:09 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2019 15:01:18 GMT",
"version": "v2"
}
] | 2020-09-02 | [
[
"Stepanian",
"A.",
""
]
] | It is shown that the concept of "negative mass" introduced by Farnes (2018) to describe the dark sector within a unifying theory with the negative cosmological constant contradicts both the essence of the General Relativity and the available observational data. A viable model with modified weak-field General Relativity... |
gr-qc/9210018 | Wai Suen | Wai-Mo Suen | Self-Consistence of Semi-Classical Gravity | 12 pages | null | null | WUGRAV-92-12 | gr-qc | null | Simon argued that the semi-classical theory of gravity, unless with some of
its solutions excluded, is unacceptable for reasons of both self-consistency
and experiment, and that it has to be replaced by a constrained semi-classical
theory. We examined whether the evidence is conclusive.
| [
{
"created": "Wed, 28 Oct 1992 23:14:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Suen",
"Wai-Mo",
""
]
] | Simon argued that the semi-classical theory of gravity, unless with some of its solutions excluded, is unacceptable for reasons of both self-consistency and experiment, and that it has to be replaced by a constrained semi-classical theory. We examined whether the evidence is conclusive. |
2103.13086 | Shinta Kasuya | Shinta Kasuya, Masataka Kobayashi | Throat effects on shadows of Kerr-like wormholes | 8 pages, 19 figures, matches to published version | Phys. Rev. D 103, 104050 (2021) | 10.1103/PhysRevD.103.104050 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit to investigate shadows cast by Kerr-like wormholes. The boundary
of the shadow is determined by unstable circular photon orbits. We find that,
in certain parameter regions, the orbit is located at the throat of the
Kerr-like wormhole, which was not considered in the literature. In these cases,
the existenc... | [
{
"created": "Wed, 24 Mar 2021 11:00:54 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Apr 2021 09:48:38 GMT",
"version": "v2"
},
{
"created": "Thu, 27 May 2021 07:15:14 GMT",
"version": "v3"
}
] | 2021-05-28 | [
[
"Kasuya",
"Shinta",
""
],
[
"Kobayashi",
"Masataka",
""
]
] | We revisit to investigate shadows cast by Kerr-like wormholes. The boundary of the shadow is determined by unstable circular photon orbits. We find that, in certain parameter regions, the orbit is located at the throat of the Kerr-like wormhole, which was not considered in the literature. In these cases, the existence ... |
2210.16143 | Guo-Chin Liu | Guo-Chin Liu and Kin-Wang Ng | Overlap reduction functions for a polarized stochastic
gravitational-wave background in the Einstein Telescope-Cosmic Explorer and
the LISA-Taiji networks | Accepted in PRD | null | 10.1103/PhysRevD.107.104040 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | The detection of gravitational waves from the coalescences of binary compact
stars by current interferometry experiments has opened up a new era of
gravitational-wave astrophysics and cosmology. The search for a stochastic
gravitational-wave background is underway by correlating signals from a pair of
detectors in th... | [
{
"created": "Fri, 28 Oct 2022 14:13:28 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Jun 2023 00:57:28 GMT",
"version": "v2"
}
] | 2023-06-06 | [
[
"Liu",
"Guo-Chin",
""
],
[
"Ng",
"Kin-Wang",
""
]
] | The detection of gravitational waves from the coalescences of binary compact stars by current interferometry experiments has opened up a new era of gravitational-wave astrophysics and cosmology. The search for a stochastic gravitational-wave background is underway by correlating signals from a pair of detectors in the ... |
gr-qc/0303082 | Antonio Padilla | Antonio Padilla | Surface terms and the Gauss-Bonnet Hamiltonian | Version to appear in Classical and Quantum Gravity. Note that this
version is 8 pages shorter than version 1, making it more suitable for the
journal. Anyone wishing more calculational detail should refer to version 1.
Some references have also been added | Class.Quant.Grav. 20 (2003) 3129-3150 | 10.1088/0264-9381/20/14/315 | null | gr-qc hep-th | null | We derive the gravitational Hamiltonian starting from the Gauss-Bonnet
action, keeping track of all surface terms. This is done using the language of
orthonormal frames and forms to keep things as tidy as possible. The surface
terms in the Hamiltonian give a remarkably simple expression for the total
energy of a spac... | [
{
"created": "Thu, 20 Mar 2003 17:55:36 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2003 15:55:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Padilla",
"Antonio",
""
]
] | We derive the gravitational Hamiltonian starting from the Gauss-Bonnet action, keeping track of all surface terms. This is done using the language of orthonormal frames and forms to keep things as tidy as possible. The surface terms in the Hamiltonian give a remarkably simple expression for the total energy of a spacet... |
2207.08471 | Javier Relancio | J.J. Relancio | Relativistic deformed kinematics: from flat to curved spacetimes | 34 pages, 1 figure | International Journal of Geometric Methods in Modern Physics
Vol.19 No. 9 (2022), 2230004 | 10.1142/S0219887822300045 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Doubly special relativity has been studied for the last twenty years as a way
to go beyond the special relativistic kinematics, trying to capture residual
effects of a quantum gravity theory. In particular, in doubly special
relativity the Einstenian relativity principle is generalized, adding to the
speed of light a... | [
{
"created": "Mon, 18 Jul 2022 09:48:00 GMT",
"version": "v1"
}
] | 2022-07-19 | [
[
"Relancio",
"J. J.",
""
]
] | Doubly special relativity has been studied for the last twenty years as a way to go beyond the special relativistic kinematics, trying to capture residual effects of a quantum gravity theory. In particular, in doubly special relativity the Einstenian relativity principle is generalized, adding to the speed of light ano... |
2310.16031 | Adri\`a Delhom | Adri\`a Delhom, Killian Guerrero, Paula Calizaya, K\'evin Falque,
Alberto Bramati, Anthony J. Brady, Maxime J. Jacquet and Ivan Agullo | Entanglement from superradiance and rotating quantum fluids of light | Updated to match published version. 13 pages with 10 figures (main
body of the article) + 11 pages (references + appendices with two extra
figures and a table with numerical data) | null | 10.1103/PhysRevD.109.105024 | null | gr-qc cond-mat.quant-gas hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | The amplification of radiation by superradiance is a universal phenomenon
observed in numerous physical systems. We demonstrate that superradiant
scattering generates entanglement for different input states, including
coherent states, thereby establishing the inherently quantum nature of this
phenomenon. To put these... | [
{
"created": "Tue, 24 Oct 2023 17:46:24 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2024 19:40:35 GMT",
"version": "v2"
},
{
"created": "Wed, 29 May 2024 09:41:50 GMT",
"version": "v3"
}
] | 2024-05-30 | [
[
"Delhom",
"Adrià",
""
],
[
"Guerrero",
"Killian",
""
],
[
"Calizaya",
"Paula",
""
],
[
"Falque",
"Kévin",
""
],
[
"Bramati",
"Alberto",
""
],
[
"Brady",
"Anthony J.",
""
],
[
"Jacquet",
"Maxime J.",
""
],... | The amplification of radiation by superradiance is a universal phenomenon observed in numerous physical systems. We demonstrate that superradiant scattering generates entanglement for different input states, including coherent states, thereby establishing the inherently quantum nature of this phenomenon. To put these c... |
2407.00767 | Yin-Da Guo | Yin-Da Guo, Nayun Jia, Shou-Shan Bao, Hong Zhang, Xin Zhang | The evolution and detection of vector superradiant instabilities | 23 pages, 15 figures | null | null | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | Ultralight vectors can extract energy and angular momentum from a Kerr black
hole (BH) due to superradiant instability, resulting in the formation of a
BH-condensate system. In this work, we carefully investigate the evolution of
this system numerically with multiple superradiant modes. Simple formulas are
obtained t... | [
{
"created": "Sun, 30 Jun 2024 17:05:23 GMT",
"version": "v1"
}
] | 2024-07-02 | [
[
"Guo",
"Yin-Da",
""
],
[
"Jia",
"Nayun",
""
],
[
"Bao",
"Shou-Shan",
""
],
[
"Zhang",
"Hong",
""
],
[
"Zhang",
"Xin",
""
]
] | Ultralight vectors can extract energy and angular momentum from a Kerr black hole (BH) due to superradiant instability, resulting in the formation of a BH-condensate system. In this work, we carefully investigate the evolution of this system numerically with multiple superradiant modes. Simple formulas are obtained to ... |
2212.10725 | Kallol Dey | Kallol Dey, Enrico Barausse and Soumen Basak | Measuring deviations from the Kerr geometry with black hole ringdown | 15 pages, 6 figures, matches version published in PRD | Phys. Rev. D 108 (2023) 2, 024064 | 10.1103/PhysRevD.108.024064 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes in General Relativity are famously characterized by two "hairs"
only, the mass and the spin of the Kerr spacetime. Theories extending General
Relativity, however, allow in principle for additional black hole charges,
which will generally modify the multipole structure of the Kerr solution. Here,
we show t... | [
{
"created": "Wed, 21 Dec 2022 02:40:23 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2023 08:57:18 GMT",
"version": "v2"
}
] | 2023-08-08 | [
[
"Dey",
"Kallol",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Basak",
"Soumen",
""
]
] | Black holes in General Relativity are famously characterized by two "hairs" only, the mass and the spin of the Kerr spacetime. Theories extending General Relativity, however, allow in principle for additional black hole charges, which will generally modify the multipole structure of the Kerr solution. Here, we show tha... |
1609.09243 | Rakesh Kabir | R. Kabir, A. Mukherjee, D. Lohiya | Reheating constraints on K\"ahler Moduli Inflation | 10 pages, 6 figures; v(2) submitted to PLB. arXiv admin note: text
overlap with arXiv:1502.04673, arXiv:1602.07427 by other authors | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The end of inflation is connected to the standard cosmological scenario
through reheating. During reheating, the inflaton oscillates around the minimum
of the potential and thus decays into the daughter particles that populate the
Universe at later times. Using cosmological evolution for observable CMB scales
from th... | [
{
"created": "Thu, 29 Sep 2016 08:01:56 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Oct 2016 06:43:11 GMT",
"version": "v2"
}
] | 2016-10-19 | [
[
"Kabir",
"R.",
""
],
[
"Mukherjee",
"A.",
""
],
[
"Lohiya",
"D.",
""
]
] | The end of inflation is connected to the standard cosmological scenario through reheating. During reheating, the inflaton oscillates around the minimum of the potential and thus decays into the daughter particles that populate the Universe at later times. Using cosmological evolution for observable CMB scales from the ... |
1805.12558 | Anne Franzen | Artur Alho, Grigorios Fournodavlos and Anne T. Franzen | The wave equation near flat Friedmann-Lema\^itre-Robertson-Walker and
Kasner Big Bang singularities | 14 pages, 1 figure | null | null | null | gr-qc astro-ph.CO math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the wave equation, $\square_g\psi=0$, in fixed flat
Friedmann-Lema\^itre-Robertson-Walker and Kasner spacetimes with topology
$\mathbb{R}_+\times\mathbb{T}^3$. We obtain generic blow up results for
solutions to the wave equation towards the Big Bang singularity in both
backgrounds. In particular, we chara... | [
{
"created": "Thu, 31 May 2018 16:55:59 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jun 2018 09:36:10 GMT",
"version": "v2"
}
] | 2018-06-04 | [
[
"Alho",
"Artur",
""
],
[
"Fournodavlos",
"Grigorios",
""
],
[
"Franzen",
"Anne T.",
""
]
] | We consider the wave equation, $\square_g\psi=0$, in fixed flat Friedmann-Lema\^itre-Robertson-Walker and Kasner spacetimes with topology $\mathbb{R}_+\times\mathbb{T}^3$. We obtain generic blow up results for solutions to the wave equation towards the Big Bang singularity in both backgrounds. In particular, we charact... |
gr-qc/0308054 | L. K. Chavda | L.K.Chavda and Abhijit L.Chavda | Dark matter and stable bound states of primordial black holes | 13 pages,2tables,for wider circulation,PDF | Class.Quant.Grav. 19 (2002) 2927 | 10.1088/0264-9381/19/11/311 | null | gr-qc astro-ph astro-ph.CO | null | We present three reasons for the formation of gravitational bound states of
primordial black holes,called holeums,in the early universe.Using Newtonian
gravity and nonrelativistic quantum mechanics we find a purely quantum
mechanical mass-dependant exclusion property for the nonoverlap of the
constituent black holes ... | [
{
"created": "Sun, 17 Aug 2003 16:05:54 GMT",
"version": "v1"
}
] | 2014-02-11 | [
[
"Chavda",
"L. K.",
""
],
[
"Chavda",
"Abhijit L.",
""
]
] | We present three reasons for the formation of gravitational bound states of primordial black holes,called holeums,in the early universe.Using Newtonian gravity and nonrelativistic quantum mechanics we find a purely quantum mechanical mass-dependant exclusion property for the nonoverlap of the constituent black holes in... |
2301.12455 | Jonathan Gorard | Jonathan Gorard, Julia Dannemann-Freitag | Axiomatic Quantum Field Theory in Discrete Spacetime via Multiway Causal
Structure: The Case of Entanglement Entropies | 93 pages, 30 figures | null | null | null | gr-qc cs.DM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The causal set and Wolfram model approaches to discrete quantum gravity both
permit the formulation of a manifestly covariant notion of entanglement entropy
for quantum fields. In the causal set case, this is given by a construction
(due to Sorkin and Johnston) of a 2-point correlation function for a Gaussian
scalar ... | [
{
"created": "Sun, 29 Jan 2023 14:37:30 GMT",
"version": "v1"
}
] | 2023-01-31 | [
[
"Gorard",
"Jonathan",
""
],
[
"Dannemann-Freitag",
"Julia",
""
]
] | The causal set and Wolfram model approaches to discrete quantum gravity both permit the formulation of a manifestly covariant notion of entanglement entropy for quantum fields. In the causal set case, this is given by a construction (due to Sorkin and Johnston) of a 2-point correlation function for a Gaussian scalar fi... |
gr-qc/0512139 | Matt Visser | Stefano Liberati (SISSA/ISAS and INFN, Trieste), Matt Visser (Victoria
University of Wellington, New Zealand), Silke Weinfurtner (Victoria
University of Wellington, New Zealand) | Naturalness in emergent spacetime | V1:4 pages, revtex4; V2: slight changes in title, presentation, and
conclusions. This version to appear in Physical Review Letters | Phys.Rev.Lett. 96 (2006) 151301 | 10.1103/PhysRevLett.96.151301 | null | gr-qc | null | Effective field theories (EFTs) have been widely used as a framework in order
to place constraints on the Planck suppressed Lorentz violations predicted by
various models of quantum gravity. There are however technical problems in the
EFT framework when it comes to ensuring that small Lorentz violations remain
small ... | [
{
"created": "Thu, 22 Dec 2005 21:36:59 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2006 00:07:39 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Liberati",
"Stefano",
"",
"SISSA/ISAS and INFN, Trieste"
],
[
"Visser",
"Matt",
"",
"Victoria\n University of Wellington, New Zealand"
],
[
"Weinfurtner",
"Silke",
"",
"Victoria\n University of Wellington, New Zealand"
]
] | Effective field theories (EFTs) have been widely used as a framework in order to place constraints on the Planck suppressed Lorentz violations predicted by various models of quantum gravity. There are however technical problems in the EFT framework when it comes to ensuring that small Lorentz violations remain small --... |
gr-qc/9605036 | Robin W. Tucker | T Dereli, J Schray, Robin W Tucker | Finite Action Yang-Mills Solutions on the Group Manifold | 10 pages LaTeX (REVTeX3.0, No Figures), To appear in J. Physics A:
Mathematical and General | J.Phys.A29:5001-5005,1996 | 10.1088/0305-4470/29/16/021 | null | gr-qc | null | We demonstrate that the left (and right) invariant Maurer-Cartan forms for
any semi-simple Lie group enable one to construct solutions of the Yang-Mills
equations on the group manifold equipped with the natural Cartan-Killing
metric. For the unitary unimodular groups the Yang-Mills action integral is
finite for such ... | [
{
"created": "Fri, 17 May 1996 13:06:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dereli",
"T",
""
],
[
"Schray",
"J",
""
],
[
"Tucker",
"Robin W",
""
]
] | We demonstrate that the left (and right) invariant Maurer-Cartan forms for any semi-simple Lie group enable one to construct solutions of the Yang-Mills equations on the group manifold equipped with the natural Cartan-Killing metric. For the unitary unimodular groups the Yang-Mills action integral is finite for such so... |
1507.06727 | Qing-Yu Cai | Dongshan He, Dongfeng Gao and Qing-yu Cai | Dynamical interpretation of the wavefunction of the universe | null | Phys. Lett. B 748, 361-365 (2015) | 10.1016/j.physletb.2015.07.029 | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the physical meaning of the wavefunction of the
universe. With the continuity equation derived from the Wheeler-DeWitt (WDW)
equation in the minisuperspace model, we show that the quantity
$\rho(a)=|\psi(a)|^2$ for the universe is inversely proportional to the Hubble
parameter of the universe.... | [
{
"created": "Fri, 24 Jul 2015 02:26:19 GMT",
"version": "v1"
}
] | 2015-07-27 | [
[
"He",
"Dongshan",
""
],
[
"Gao",
"Dongfeng",
""
],
[
"Cai",
"Qing-yu",
""
]
] | In this paper, we study the physical meaning of the wavefunction of the universe. With the continuity equation derived from the Wheeler-DeWitt (WDW) equation in the minisuperspace model, we show that the quantity $\rho(a)=|\psi(a)|^2$ for the universe is inversely proportional to the Hubble parameter of the universe. T... |
2401.13972 | Umber Sheikh | Wasib Ali and Umber Sheikh | Charged Strange Star Model with Stringy Quark Matter in Rainbow Gravity | 17 pages, 18 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This study deals with the formation and evolution of a strange star in the
Krori Barua Rainbow spacetime from collapsing charged stringy quark matter. The
dynamical variables are explored from the field equations, taking into account
the effects of particle's energy on the mass density, pressure, and string
tension. ... | [
{
"created": "Thu, 25 Jan 2024 06:07:22 GMT",
"version": "v1"
}
] | 2024-01-26 | [
[
"Ali",
"Wasib",
""
],
[
"Sheikh",
"Umber",
""
]
] | This study deals with the formation and evolution of a strange star in the Krori Barua Rainbow spacetime from collapsing charged stringy quark matter. The dynamical variables are explored from the field equations, taking into account the effects of particle's energy on the mass density, pressure, and string tension. Th... |
1709.02768 | Anna M. Nobili | Anna M. Nobili and Alberto Anselmi | Relevance of the weak equivalence principle and experiments to test it:
lessons from the past and improvements expected in space | To appear: Physics Letters A, special issue in memory of Professor
Vladimir Braginsky, 2017. Available online:
http://dx.doi.org/10.1016/j.physleta.2017.09.027 | null | 10.1016/j.physleta.2017.09.027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tests of the Weak Equivalence Principle (WEP) probe the foundations of
physics. Ever since Galileo in the early 1600s, WEP tests have attracted some
of the best experimentalists of any time. Progress has come in bursts, each
stimulated by the introduction of a new technique: the torsion balance, signal
modulation by ... | [
{
"created": "Fri, 8 Sep 2017 16:38:41 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Oct 2017 16:38:06 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Nobili",
"Anna M.",
""
],
[
"Anselmi",
"Alberto",
""
]
] | Tests of the Weak Equivalence Principle (WEP) probe the foundations of physics. Ever since Galileo in the early 1600s, WEP tests have attracted some of the best experimentalists of any time. Progress has come in bursts, each stimulated by the introduction of a new technique: the torsion balance, signal modulation by Ea... |
1209.1701 | Jan Weenink | Tomislav Prokopec and Jan Weenink | Uniqueness of the gauge invariant action for cosmological perturbations | 27 pages | null | 10.1088/1475-7516/2012/12/031 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In second order perturbation theory different definitions are known of gauge
invariant perturbations in single field inflationary models. Consequently the
corresponding gauge invariant cubic actions do not have the same form. Here we
show that the cubic action for one choice of gauge invariant variables is
unique in ... | [
{
"created": "Sat, 8 Sep 2012 10:21:44 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Prokopec",
"Tomislav",
""
],
[
"Weenink",
"Jan",
""
]
] | In second order perturbation theory different definitions are known of gauge invariant perturbations in single field inflationary models. Consequently the corresponding gauge invariant cubic actions do not have the same form. Here we show that the cubic action for one choice of gauge invariant variables is unique in th... |
2102.12805 | Reinoud Slagter | Reinoud Jan Slagter | New Evidence of the Azimuthal Alignment of Quasars Spin vector in the
LQG U1.28, U1.27, U1.11, Cosmologically Explained | Second version. No major changes. Feedback welcome. 3 figures 3 pages | null | 10.1016/j.newast.2022.101797 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | There is observational evidence that the spin axes of quasars in large quasar
groups are correlated over hundreds of Mpc. This is found in the radio sector
as well as in the optical range. There is not yet a satisfactory explanation of
this "spooky" alignment. This alignment cannot be explained by mutual
interaction ... | [
{
"created": "Thu, 25 Feb 2021 12:08:39 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 2021 15:44:17 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Slagter",
"Reinoud Jan",
""
]
] | There is observational evidence that the spin axes of quasars in large quasar groups are correlated over hundreds of Mpc. This is found in the radio sector as well as in the optical range. There is not yet a satisfactory explanation of this "spooky" alignment. This alignment cannot be explained by mutual interaction at... |
1504.04610 | Giorgio Papini | Giorgio Papini | Perspectives on gravity-induced radiative processes in astrophysics | 8 pages, one figure. arXiv admin note: substantial text overlap with
arXiv:1007.4834 | Galaxies 2015, 3, 72-83 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Single-vertex Feynman diagrams represent the dominant contribution to
physical processes, but are frequently forbidden kinematically. This is changed
when the particles involved propagate in a gravitational background and acquire
an effective mass. Procedures are introduced that allow the calculation of
lowest order ... | [
{
"created": "Fri, 17 Apr 2015 19:16:37 GMT",
"version": "v1"
}
] | 2015-04-20 | [
[
"Papini",
"Giorgio",
""
]
] | Single-vertex Feynman diagrams represent the dominant contribution to physical processes, but are frequently forbidden kinematically. This is changed when the particles involved propagate in a gravitational background and acquire an effective mass. Procedures are introduced that allow the calculation of lowest order di... |
2001.04367 | Dipanjan Dey | Karim Mosani, Dipanjan Dey, Pankaj S. Joshi | Strong curvature naked singularities in spherically symmetric perfect
fluid collapse | 8 pages | Phys. Rev. D 101, 044052 (2020) | 10.1103/PhysRevD.101.044052 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate here the locally naked singularity formed due to a spherically
symmetric inhomogeneous collapsing cloud having non-zero isotropic pressure, in
terms of its strength. Sufficient condition provided by Clarke and Krolak for
it to be Tipler strong has been used to restrict the parameters that represent
the... | [
{
"created": "Mon, 13 Jan 2020 16:01:15 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2020 05:07:49 GMT",
"version": "v2"
}
] | 2020-03-04 | [
[
"Mosani",
"Karim",
""
],
[
"Dey",
"Dipanjan",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We investigate here the locally naked singularity formed due to a spherically symmetric inhomogeneous collapsing cloud having non-zero isotropic pressure, in terms of its strength. Sufficient condition provided by Clarke and Krolak for it to be Tipler strong has been used to restrict the parameters that represent the n... |
gr-qc/0703127 | Hirotaka Yoshino | Hirotaka Yoshino, Andrei Zelnikov, Valeri P. Frolov | Apparent horizon formation in the head-on collision of gyratons | 44 pages, 21 figures, published version | Phys.Rev.D75:124005,2007 | 10.1103/PhysRevD.75.124005 | Alberta-Thy-01-07 | gr-qc hep-ph hep-th | null | The gyraton model describes a gravitational field of an object moving with
the velocity of light which has finite energy and spin distributed during some
finite time interval $L$. A gyraton may be considered as a classical toy model
for a quantum wave packet of high-energy particles with spin. In this paper we
study ... | [
{
"created": "Mon, 26 Mar 2007 20:37:41 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Apr 2007 04:35:26 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jun 2007 21:12:04 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Yoshino",
"Hirotaka",
""
],
[
"Zelnikov",
"Andrei",
""
],
[
"Frolov",
"Valeri P.",
""
]
] | The gyraton model describes a gravitational field of an object moving with the velocity of light which has finite energy and spin distributed during some finite time interval $L$. A gyraton may be considered as a classical toy model for a quantum wave packet of high-energy particles with spin. In this paper we study a ... |
gr-qc/9901047 | Matt Visser | Matt Visser (Washington University) | Acoustic black holes | 10 pages, uses Springer-Verlag macro package. To appear in the
Proceedings of the 1998 Peniscola Summer School on Particle Physics and
Cosmology. (Springer-Verlag) | null | null | null | gr-qc | null | Acoustic propagation in a moving fluid provides a conceptually clean and
powerful analogy for understanding black hole physics. As a teaching tool, the
analogy is useful for introducing students to both General Relativity and fluid
mechanics. As a research tool, the analogy helps clarify what aspects of the
physics a... | [
{
"created": "Sat, 16 Jan 1999 01:47:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Visser",
"Matt",
"",
"Washington University"
]
] | Acoustic propagation in a moving fluid provides a conceptually clean and powerful analogy for understanding black hole physics. As a teaching tool, the analogy is useful for introducing students to both General Relativity and fluid mechanics. As a research tool, the analogy helps clarify what aspects of the physics are... |
1302.5628 | Miquel Nofrarias | M. Nofrarias, F. Gibert, N. Karnesis, A.F. Garcia, M. Hewitson, G.
Heinzel, K. Danzmann | Subtraction of temperature induced phase noise in the LISA frequency
band | 8 pages, 6 figures | null | 10.1103/PhysRevD.87.102003 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Temperature fluctuations are expected to be one of the limiting factors for
gravitational wave detectors in the very low frequency range. Here we report
the characterisation of this noise source in the LISA Pathfinder optical bench
and propose a method to remove its contribution from the data. Our results show
that t... | [
{
"created": "Fri, 22 Feb 2013 16:12:44 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jun 2013 10:20:21 GMT",
"version": "v2"
}
] | 2013-06-20 | [
[
"Nofrarias",
"M.",
""
],
[
"Gibert",
"F.",
""
],
[
"Karnesis",
"N.",
""
],
[
"Garcia",
"A. F.",
""
],
[
"Hewitson",
"M.",
""
],
[
"Heinzel",
"G.",
""
],
[
"Danzmann",
"K.",
""
]
] | Temperature fluctuations are expected to be one of the limiting factors for gravitational wave detectors in the very low frequency range. Here we report the characterisation of this noise source in the LISA Pathfinder optical bench and propose a method to remove its contribution from the data. Our results show that tem... |
1111.3737 | Frank Ohme | Frank Ohme | Analytical meets numerical relativity - status of complete gravitational
waveform models for binary black holes | 13 pages, 2 figures, 1 table, NRDA2011/Amaldi 9 proceedings;
published version with extended discussion of accuracy requirements and a new
figure 2 | 2012 Class. Quantum Grav. 29 124002 | 10.1088/0264-9381/29/12/124002 | AEI-2011-090 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models of gravitational waveforms from coalescing black-hole binaries play a
crucial role in the efforts to detect and interpret the signatures of those
binaries in the data of large-scale interferometers. Here we summarize recent
models that combine information both from analytical approximations and
numerical relat... | [
{
"created": "Wed, 16 Nov 2011 09:33:35 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Feb 2012 14:51:46 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Ohme",
"Frank",
""
]
] | Models of gravitational waveforms from coalescing black-hole binaries play a crucial role in the efforts to detect and interpret the signatures of those binaries in the data of large-scale interferometers. Here we summarize recent models that combine information both from analytical approximations and numerical relativ... |
gr-qc/9704067 | Max welling | M. Welling (Utrecht University) | Winding Solutions for the two Particle System in 2+1 Gravity | 15 pages Latex, 4 eps figures | Class.Quant.Grav. 15 (1998) 613-626 | 10.1088/0264-9381/15/3/012 | THU-97/10 | gr-qc | null | Using a PASCAL program to follow the evolution of two gravitating particles
in 2+1 dimensions we find solutions in which the particles wind around one
another indefinitely. As their center of mass moves `tachyonic' they form a
Gott-pair. To avoid unphysical boundary conditions we consider a large but
closed universe.... | [
{
"created": "Thu, 24 Apr 1997 13:36:11 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Welling",
"M.",
"",
"Utrecht University"
]
] | Using a PASCAL program to follow the evolution of two gravitating particles in 2+1 dimensions we find solutions in which the particles wind around one another indefinitely. As their center of mass moves `tachyonic' they form a Gott-pair. To avoid unphysical boundary conditions we consider a large but closed universe. A... |
1502.04679 | Florent Michel | Florent Michel, Renaud Parentani | Non-linear effects in time-dependent transonic flows: An analysis of
analogue black hole stability | 25 pages, 16 figures. Final version published in PRA | Phys. Rev. A 91, 053603 (2015) | 10.1103/PhysRevA.91.053603 | LPT-Orsay-15-13 | gr-qc cond-mat.quant-gas nlin.PS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study solutions of the one-dimensional Gross-Pitaevskii equation to better
understand dynamical instabilities occurring in flowing atomic condensates.
Whereas transonic stationary flows can be fully described in simple terms,
time-dependent flows exhibit a wide variety of behaviors. When the sound speed
is crossed... | [
{
"created": "Mon, 16 Feb 2015 19:43:28 GMT",
"version": "v1"
},
{
"created": "Sat, 9 May 2015 16:45:35 GMT",
"version": "v2"
}
] | 2015-05-12 | [
[
"Michel",
"Florent",
""
],
[
"Parentani",
"Renaud",
""
]
] | We study solutions of the one-dimensional Gross-Pitaevskii equation to better understand dynamical instabilities occurring in flowing atomic condensates. Whereas transonic stationary flows can be fully described in simple terms, time-dependent flows exhibit a wide variety of behaviors. When the sound speed is crossed o... |
gr-qc/9608061 | Lior M. Burko | Lior M. Burko | Comment on the Roberts solution for the spherically-symmetric
Einstein-scalar field equations | 3 pages, RevTeX | Gen.Rel.Grav.29:259,1997 | 10.1023/A:1010200430550 | null | gr-qc | null | We critically examine the Roberts homothetic solution for the spherically
symmetric Einstein-scalar field equations in double null coordinates, and show
that the Roberts solution indeed solves the field equations only for one
non-trivial case. We generalize this solution and discuss its relations with
other known exa... | [
{
"created": "Mon, 26 Aug 1996 11:37:38 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Burko",
"Lior M.",
""
]
] | We critically examine the Roberts homothetic solution for the spherically symmetric Einstein-scalar field equations in double null coordinates, and show that the Roberts solution indeed solves the field equations only for one non-trivial case. We generalize this solution and discuss its relations with other known exact... |
2306.06576 | Huan Yang | Zhen Pan, Huan Yang, Laura Bernard, B\'eatrice Bonga | Resonant dynamics of extreme mass-ratio inspirals in a perturbed Kerr
spacetime | 22 pages, 17 figures | Phys. Rev. D 108,104026 (2023) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extreme mass-ratio inspirals (EMRI) are one of the most sensitive probes of
black hole spacetimes with gravitational wave measurements. In this work, we
systematically analyze the dynamics of an EMRI system near orbital resonances,
assuming the background spacetime is weakly perturbed from Kerr. Using the
action-angl... | [
{
"created": "Sun, 11 Jun 2023 03:44:49 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jul 2023 01:59:30 GMT",
"version": "v2"
}
] | 2023-11-15 | [
[
"Pan",
"Zhen",
""
],
[
"Yang",
"Huan",
""
],
[
"Bernard",
"Laura",
""
],
[
"Bonga",
"Béatrice",
""
]
] | Extreme mass-ratio inspirals (EMRI) are one of the most sensitive probes of black hole spacetimes with gravitational wave measurements. In this work, we systematically analyze the dynamics of an EMRI system near orbital resonances, assuming the background spacetime is weakly perturbed from Kerr. Using the action-angle ... |
1612.08661 | Sunny Vagnozzi | L. Sebastiani, S. Vagnozzi, R. Myrzakulov | Mimetic gravity: a review of recent developments and applications to
cosmology and astrophysics | 68 pages, invited review to appear in Advances in High Energy Physics | Adv. High Energy Phys. 2017 (2017) 3156915 | 10.1155/2017/3156915 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mimetic gravity is a Weyl-symmetric extension of General Relativity, related
to the latter by a singular disformal transformation, wherein the appearance of
a dust-like perfect fluid can mimic cold dark matter at a cosmological level.
Within this framework, it is possible to provide an unified geometrical
explanation... | [
{
"created": "Tue, 27 Dec 2016 15:44:39 GMT",
"version": "v1"
}
] | 2017-03-03 | [
[
"Sebastiani",
"L.",
""
],
[
"Vagnozzi",
"S.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | Mimetic gravity is a Weyl-symmetric extension of General Relativity, related to the latter by a singular disformal transformation, wherein the appearance of a dust-like perfect fluid can mimic cold dark matter at a cosmological level. Within this framework, it is possible to provide an unified geometrical explanation f... |
gr-qc/9711042 | R. Garcia | H.F.Dowker, R.S.Garcia | A handlebody calculus for topology change | Latex, 32 pages, 7 figures | Class.Quant.Grav. 15 (1998) 1859-1879 | 10.1088/0264-9381/15/7/005 | Imperial/TP/97-98/11 | gr-qc | null | We consider certain interesting processes in quantum gravity which involve a
change of spatial topology. We use Morse theory and the machinery of
handlebodies to characterise topology changes as suggested by Sorkin. Our
results support the view that that the pair production of Kaluza-Klein
monopoles and the nucleatio... | [
{
"created": "Wed, 12 Nov 1997 17:26:25 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Dowker",
"H. F.",
""
],
[
"Garcia",
"R. S.",
""
]
] | We consider certain interesting processes in quantum gravity which involve a change of spatial topology. We use Morse theory and the machinery of handlebodies to characterise topology changes as suggested by Sorkin. Our results support the view that that the pair production of Kaluza-Klein monopoles and the nucleation ... |
gr-qc/9810002 | Takeshi Chiba | Takeshi Chiba | Resolving the singularity of the Hawking-Turok type instanton | minor changes, 8 pages, to be published in Phys.Lett.B | Phys.Lett. B442 (1998) 59-62 | 10.1016/S0370-2693(98)01273-8 | null | gr-qc astro-ph | null | We point out that the singular instanton of Hawking-Turok type, in which the
singularity occurs due to the divergence of a massless scalar field, can be
generated by Euclideanized regular $p$-brane solutions in string (or M-) theory
upon compactification to four dimensions.
| [
{
"created": "Thu, 1 Oct 1998 13:22:26 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Nov 1998 07:03:34 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Chiba",
"Takeshi",
""
]
] | We point out that the singular instanton of Hawking-Turok type, in which the singularity occurs due to the divergence of a massless scalar field, can be generated by Euclideanized regular $p$-brane solutions in string (or M-) theory upon compactification to four dimensions. |
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