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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2108.02693 | Leonardo Garc\'ia-Heveling | Annegret Burtscher and Leonardo Garc\'ia-Heveling | Time functions on Lorentzian length spaces | Accepted version. 40 pages, 2 figures | null | 10.1007/s00023-024-01461-y | null | gr-qc math-ph math.DG math.MG math.MP | http://creativecommons.org/licenses/by/4.0/ | In general relativity, time functions are crucial objects whose existence and
properties are intimately tied to the causal structure of a spacetime and also
to the initial value formulation of the Einstein equations. In this work we
establish all fundamental classical existence results on time functions in the
settin... | [
{
"created": "Thu, 5 Aug 2021 15:53:48 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Sep 2021 09:57:43 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jul 2024 10:36:39 GMT",
"version": "v3"
}
] | 2024-07-03 | [
[
"Burtscher",
"Annegret",
""
],
[
"García-Heveling",
"Leonardo",
""
]
] | In general relativity, time functions are crucial objects whose existence and properties are intimately tied to the causal structure of a spacetime and also to the initial value formulation of the Einstein equations. In this work we establish all fundamental classical existence results on time functions in the setting ... |
2208.01995 | Rajibul Shaikh | Rajibul Shaikh | Testing black hole mimickers with the Event Horizon Telescope image of
Sagittarius A$^*$ | 21 pages, 9 captioned figures, published in MNRAS. arXiv admin note:
text overlap with arXiv:2102.04299 | Mon. Not. Roy. Astron. Soc. 523, 375-384 (2023) | 10.1093/mnras/stad1383 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Event Horizon Telescope (EHT) has recently observed the image and shadow
of the supermassive compact object Sagittarius A$^*$ (Sgr A$^*$). According to
the EHT collaboration, the observed image is consistent with the expected
appearance of a Kerr black hole. However, it is well-known that some non-Kerr
objects ma... | [
{
"created": "Wed, 3 Aug 2022 11:44:13 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 2023 10:20:36 GMT",
"version": "v2"
}
] | 2023-05-29 | [
[
"Shaikh",
"Rajibul",
""
]
] | The Event Horizon Telescope (EHT) has recently observed the image and shadow of the supermassive compact object Sagittarius A$^*$ (Sgr A$^*$). According to the EHT collaboration, the observed image is consistent with the expected appearance of a Kerr black hole. However, it is well-known that some non-Kerr objects may ... |
2206.14096 | Javier Relancio | G. Chirco, S. Liberati, J.J. Relancio | Space-time thermodynamics in momentum dependent geometries | 16 pages, 2 figures | null | 10.1103/PhysRevD.106.064048 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A possible way to capture the effects of quantum gravity in spacetime at a
mesoscopic scale, for relatively low energies, is through an energy dependent
metric, such that particles with different energies probe different spacetimes.
In this context, a clear connection between a geometrical approach and
modifications ... | [
{
"created": "Tue, 28 Jun 2022 15:44:24 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 2022 06:28:41 GMT",
"version": "v2"
}
] | 2022-10-12 | [
[
"Chirco",
"G.",
""
],
[
"Liberati",
"S.",
""
],
[
"Relancio",
"J. J.",
""
]
] | A possible way to capture the effects of quantum gravity in spacetime at a mesoscopic scale, for relatively low energies, is through an energy dependent metric, such that particles with different energies probe different spacetimes. In this context, a clear connection between a geometrical approach and modifications of... |
1404.1358 | Abraao Capistrano | Abraao J. S. Capistrano, Waldir L. Roque, Rafael S. Valada | Weyl conformastatic perihelion advance of small body objects | accepted for publication in Monthly Notices of the Royal Astronomical
Society | MNRAS (October 21, 2014) 444 (2): 1639-1646 | 10.1093/mnras/stu1567 | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine a static gravitational field with axial symmetry
over probe particles in the solar system. Using the Weyl conformastatic
solution as a model, we find a non-standard expression to perihelion advance
due to the constraints imposed by the topology of the local gravitational
field. We show that ... | [
{
"created": "Tue, 25 Mar 2014 02:54:00 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2014 23:07:17 GMT",
"version": "v2"
}
] | 2016-06-01 | [
[
"Capistrano",
"Abraao J. S.",
""
],
[
"Roque",
"Waldir L.",
""
],
[
"Valada",
"Rafael S.",
""
]
] | In this paper, we examine a static gravitational field with axial symmetry over probe particles in the solar system. Using the Weyl conformastatic solution as a model, we find a non-standard expression to perihelion advance due to the constraints imposed by the topology of the local gravitational field. We show that th... |
1303.6692 | Petr Tsatsin | Petr Tsatsin and Pedro Marronetti | Initial data for neutron star binaries with arbitrary spins | Greatly improved version accepted by PRD that introduces a new
over-correction mechanism and several high resolutions binary runs, as well
as a number of suggestions from the Referees. 16 pages, 28 figures | Phys. Rev. D 88, 064060 (2013) | 10.1103/PhysRevD.88.064060 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The starting point of any general relativistic numerical simulation is a
solution of the Hamiltonian and momentum constraints that (ideally) represents
an astrophysically realistic scenario. We present a new method to produce
initial data sets for binary neutron stars with arbitrary spins and orbital
eccentricities. ... | [
{
"created": "Tue, 26 Mar 2013 22:47:53 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2013 16:35:54 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Tsatsin",
"Petr",
""
],
[
"Marronetti",
"Pedro",
""
]
] | The starting point of any general relativistic numerical simulation is a solution of the Hamiltonian and momentum constraints that (ideally) represents an astrophysically realistic scenario. We present a new method to produce initial data sets for binary neutron stars with arbitrary spins and orbital eccentricities. Th... |
0901.0580 | Eric Korman | Eric O. Korman, George Sparling | Bilinear Forms and Fierz Identities for Real Spin Representations | 42 pages. v3 fixes typo defining M on page 28, adds reference to
Krawtchouk matrices | null | 10.1007/s00006-011-0307-3 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a real representation of the Clifford algebra corresponding to
$R^{p+q}$ with metric of signature $(p,q)$, we demonstrate the existence of two
natural bilinear forms on the space of spinors. With the Clifford action of
$k$-forms on spinors, the bilinear forms allow us to relate two spinors with
elements of the ... | [
{
"created": "Mon, 5 Jan 2009 23:51:56 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jan 2009 20:57:07 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Apr 2009 00:06:36 GMT",
"version": "v3"
}
] | 2013-07-22 | [
[
"Korman",
"Eric O.",
""
],
[
"Sparling",
"George",
""
]
] | Given a real representation of the Clifford algebra corresponding to $R^{p+q}$ with metric of signature $(p,q)$, we demonstrate the existence of two natural bilinear forms on the space of spinors. With the Clifford action of $k$-forms on spinors, the bilinear forms allow us to relate two spinors with elements of the ex... |
1605.05268 | Carlo Rovelli | Marios Christodoulou, Carlo Rovelli, Simone Speziale, Ilya Vilensky | Realistic Observable in Background-Free Quantum Gravity: the Planck-Star
Tunnelling-Time | We consider this paper important. 17 pages, 13 figures | Phys. Rev. D 94, 084035 (2016) | 10.1103/PhysRevD.94.084035 | null | gr-qc astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A gravitationally collapsed object can bounce-out from its horizon via a
tunnelling process that violates the classical equations in a finite region.
Since tunnelling is a non-perturbative phenomenon, it cannot be described in
terms of quantum fluctuations around a classical solution and a background-free
formulation... | [
{
"created": "Tue, 17 May 2016 17:59:54 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jul 2016 12:23:24 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Sep 2016 11:42:48 GMT",
"version": "v3"
}
] | 2016-10-26 | [
[
"Christodoulou",
"Marios",
""
],
[
"Rovelli",
"Carlo",
""
],
[
"Speziale",
"Simone",
""
],
[
"Vilensky",
"Ilya",
""
]
] | A gravitationally collapsed object can bounce-out from its horizon via a tunnelling process that violates the classical equations in a finite region. Since tunnelling is a non-perturbative phenomenon, it cannot be described in terms of quantum fluctuations around a classical solution and a background-free formulation o... |
1710.07225 | Ren Zhao | Ren Zhao and Li-Chun Zhang | Entropy of higher-dimensional charged de Sitter black holes and phase
transition | 12 pages, 4 figures, references added. arXiv admin note: text overlap
with arXiv:1109.2433 by other authors | null | 10.1088/0253-6102/70/5/578 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From a new perspective, we discuss the thermodynamic entropy of
$n+2$-dimensional Reissner-Nordstr\"om-de Sitter(RNdS) black hole and analyze
the phase transition of the effective thermodynamic system. Considering the
correlations between the black hole event horizon and the cosmological horizon,
we conjecture that t... | [
{
"created": "Wed, 18 Oct 2017 06:00:59 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2017 13:31:58 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Nov 2017 13:01:51 GMT",
"version": "v3"
}
] | 2018-12-26 | [
[
"Zhao",
"Ren",
""
],
[
"Zhang",
"Li-Chun",
""
]
] | From a new perspective, we discuss the thermodynamic entropy of $n+2$-dimensional Reissner-Nordstr\"om-de Sitter(RNdS) black hole and analyze the phase transition of the effective thermodynamic system. Considering the correlations between the black hole event horizon and the cosmological horizon, we conjecture that the... |
0807.3389 | Morteza Mohseni | Morteza Mohseni | Spinning fluid cosmology | null | Phys.Lett.B663:165-167,2008 | 10.1016/j.physletb.2008.04.015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of a spinning fluid in a flat cosmological model is
investigated. The space-time is itself generated by the spinning fluid which is
characterized by an energy-momentum tensor consisting a sum of the usual
perfect-fluid energy-momentum tensor and some Belinfante-Rosenfeld tensors. It
is shown that the equ... | [
{
"created": "Tue, 22 Jul 2008 04:53:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mohseni",
"Morteza",
""
]
] | The dynamics of a spinning fluid in a flat cosmological model is investigated. The space-time is itself generated by the spinning fluid which is characterized by an energy-momentum tensor consisting a sum of the usual perfect-fluid energy-momentum tensor and some Belinfante-Rosenfeld tensors. It is shown that the equat... |
1905.09933 | Emil Nissimov | David Benisty, Eduardo Guendelman, Alexander Kaganovich, Emil
Nissimov, Svetlana Pacheva | Modified Gravity Theories Based on the Non-Canonical Volume-Form
Formalism | Contribution to XIII-th International Workshop "Lie Theory and Its
Applications in Physics", Varna (2019); to be published in Springer
Proceedings in Mathematics and Statistics, ed. V Dobrev, Springer (2020) | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a concise description of the basic features of gravity-matter
models based on the formalism of non-canonical spacetime volume-forms in its
two versions: the method of non-Riemannian volume-forms (metric-independent
covariant volume elements) and the dynamical spacetime formalism. Among the
principal outcom... | [
{
"created": "Thu, 23 May 2019 21:13:12 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2019 18:25:29 GMT",
"version": "v2"
}
] | 2019-10-15 | [
[
"Benisty",
"David",
""
],
[
"Guendelman",
"Eduardo",
""
],
[
"Kaganovich",
"Alexander",
""
],
[
"Nissimov",
"Emil",
""
],
[
"Pacheva",
"Svetlana",
""
]
] | We present a concise description of the basic features of gravity-matter models based on the formalism of non-canonical spacetime volume-forms in its two versions: the method of non-Riemannian volume-forms (metric-independent covariant volume elements) and the dynamical spacetime formalism. Among the principal outcomes... |
1411.5675 | Ahmed Farag Ali | Mir Faizal, Ahmed Farag Ali, Saurya Das | Discreteness of time in the evolution of the universe | 20 pages, 0 figures, To appear in IJMPA | Int.J.Mod.Phys. A32 (2017), 1750049 | 10.1142/S0217751X1750049X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we will first derive the Wheeler-DeWitt equation for the
generalized geometry which occurs in M-theory. Then we will observe that
M2-branes act as probes for this generalized geometry, and as M2-branes have an
extended structure, their extended structure will limits the resolution to
which this general... | [
{
"created": "Thu, 20 Nov 2014 09:04:32 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2017 00:43:23 GMT",
"version": "v2"
}
] | 2017-03-16 | [
[
"Faizal",
"Mir",
""
],
[
"Ali",
"Ahmed Farag",
""
],
[
"Das",
"Saurya",
""
]
] | In this paper, we will first derive the Wheeler-DeWitt equation for the generalized geometry which occurs in M-theory. Then we will observe that M2-branes act as probes for this generalized geometry, and as M2-branes have an extended structure, their extended structure will limits the resolution to which this generaliz... |
2306.13912 | Francisco Lobo | Miguel A. S. Pinto, Tiberiu Harko, Francisco S. N. Lobo | Irreversible Geometrothermodynamics of Open Systems in Modified Gravity | 17 pages; review article based on arXiv:2205.12545, arXiv:1508.02511
and arXiv:1408.3465. Published version in Entropy | Entropy 2023, 25(6), 944 | 10.3390/e25060944 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we explore the formalism of the irreversible thermodynamics of
open systems and the possibility of gravitationally generated particle
production in modified gravity. More specifically, we consider the
scalar-tensor representation of $f(R,T)$ gravity, in which the matter
energy-momentum tensor is not con... | [
{
"created": "Sat, 24 Jun 2023 09:24:14 GMT",
"version": "v1"
}
] | 2023-06-27 | [
[
"Pinto",
"Miguel A. S.",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work, we explore the formalism of the irreversible thermodynamics of open systems and the possibility of gravitationally generated particle production in modified gravity. More specifically, we consider the scalar-tensor representation of $f(R,T)$ gravity, in which the matter energy-momentum tensor is not conse... |
2305.07630 | Shant Baghram | Javad Tabatabaei, Abdolali Banihashemi, Shant Baghram, Bahram Mashhoon | Dynamic Dark Energy from the Local Limit of Nonlocal Gravity | Honorable Mention in the Gravity Research Foundation 2023 Awards for
Essays on Gravitation | International Journal of Modern Physics D, Vol. 32, No. 14,
2342009 (2023) | 10.1142/S0218271823420099 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Nonlocal gravity (NLG), a classical extension of Einstein's theory of
gravitation, has been studied mainly in linearized form. In particular,
nonlinearities have thus far prevented the treatment of cosmological models in
NLG. In this essay, we discuss the local limit of NLG and apply this limit to
the expanding homog... | [
{
"created": "Fri, 12 May 2023 17:33:51 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2023 15:53:37 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Feb 2024 18:00:27 GMT",
"version": "v3"
}
] | 2024-02-26 | [
[
"Tabatabaei",
"Javad",
""
],
[
"Banihashemi",
"Abdolali",
""
],
[
"Baghram",
"Shant",
""
],
[
"Mashhoon",
"Bahram",
""
]
] | Nonlocal gravity (NLG), a classical extension of Einstein's theory of gravitation, has been studied mainly in linearized form. In particular, nonlinearities have thus far prevented the treatment of cosmological models in NLG. In this essay, we discuss the local limit of NLG and apply this limit to the expanding homogen... |
1705.07938 | Nat\'alia Ten\'orio Maia | Nat\'alia T. Maia, Chad R. Galley, Adam K. Leibovich, Rafael A. Porto | Radiation reaction for spinning bodies in effective field theory II:
Spin-spin effects | 9 pages | Phys. Rev. D 96, 084065 (2017) | 10.1103/PhysRevD.96.084065 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the leading Post-Newtonian (PN) contributions at quadratic order
in the spins to the radiation-reaction acceleration and spin evolution for
binary systems, entering at four-and-a-half PN order. Our calculation includes
the back-reaction from finite-size spin effects, which is presented for the
first time. ... | [
{
"created": "Mon, 22 May 2017 18:32:18 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2017 18:43:42 GMT",
"version": "v2"
}
] | 2017-11-08 | [
[
"Maia",
"Natália T.",
""
],
[
"Galley",
"Chad R.",
""
],
[
"Leibovich",
"Adam K.",
""
],
[
"Porto",
"Rafael A.",
""
]
] | We compute the leading Post-Newtonian (PN) contributions at quadratic order in the spins to the radiation-reaction acceleration and spin evolution for binary systems, entering at four-and-a-half PN order. Our calculation includes the back-reaction from finite-size spin effects, which is presented for the first time. Th... |
gr-qc/9404054 | Ira Terwyen Phy190 | Peter Goetsch and Robert Graham | Linear stochastic wave-equations for continuously measured quantum
systems | 34 pages, Revtex | null | 10.1103/PhysRevA.50.5242 | null | gr-qc | null | While the linearity of the Schr\"odinger equation and the superposition
principle are fundamental to quantum mechanics, so are the backaction of
measurements and the resulting nonlinearity. It is remarkable, therefore, that
the wave-equation of systems in continuous interaction with some reservoir,
which may be a mea... | [
{
"created": "Tue, 26 Apr 1994 10:55:52 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 1994 09:19:54 GMT",
"version": "v2"
},
{
"created": "Tue, 17 May 1994 11:13:00 GMT",
"version": "v3"
}
] | 2009-10-22 | [
[
"Goetsch",
"Peter",
""
],
[
"Graham",
"Robert",
""
]
] | While the linearity of the Schr\"odinger equation and the superposition principle are fundamental to quantum mechanics, so are the backaction of measurements and the resulting nonlinearity. It is remarkable, therefore, that the wave-equation of systems in continuous interaction with some reservoir, which may be a measu... |
2212.01930 | Hongguang Liu | Kristina Giesel, Muxin Han, Bao-Fei Li, Hongguang Liu, Parampreet
Singh | Spherical symmetric gravitational collapse of a dust cloud: polymerized
dynamics in reduced phase space | 25 pages, 7 figures | null | 10.1103/PhysRevD.107.044047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the effective dynamics in the $\bar \mu$ scheme of the spherical
symmetry reduced model in the reduced phase space formulation of loop quantum
gravity (LQG), we investigate the gravitational collapse of a homogeneous dust
cloud, with Gaussian dust serving as both the reference field and the source of
the gra... | [
{
"created": "Sun, 4 Dec 2022 21:28:13 GMT",
"version": "v1"
}
] | 2023-03-08 | [
[
"Giesel",
"Kristina",
""
],
[
"Han",
"Muxin",
""
],
[
"Li",
"Bao-Fei",
""
],
[
"Liu",
"Hongguang",
""
],
[
"Singh",
"Parampreet",
""
]
] | Based on the effective dynamics in the $\bar \mu$ scheme of the spherical symmetry reduced model in the reduced phase space formulation of loop quantum gravity (LQG), we investigate the gravitational collapse of a homogeneous dust cloud, with Gaussian dust serving as both the reference field and the source of the gravi... |
1807.06880 | Theodoros Nakas | Panagiota Kanti, Theodoros Nakas, Nikolaos Pappas | Anti-Gravitating Brane-World Solutions for a de Sitter Brane in
Scalar-Tensor Gravity | 32 pages, 8 figures, typos corrected, detailed references, published
in Physical Review D | Phys. Rev. D 98, 064025 (2018) | 10.1103/PhysRevD.98.064025 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of a five-dimensional theory with a scalar field
non-minimally-coupled to gravity, we look for solutions that describe novel
black-string or maximally-symmetric solutions in the bulk. The brane
line-element is found to describe a Schwarzschild-(Anti)-de Sitter spacetime,
and, here, we choose to study s... | [
{
"created": "Wed, 18 Jul 2018 11:57:03 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Oct 2018 09:35:29 GMT",
"version": "v2"
}
] | 2018-10-09 | [
[
"Kanti",
"Panagiota",
""
],
[
"Nakas",
"Theodoros",
""
],
[
"Pappas",
"Nikolaos",
""
]
] | In the context of a five-dimensional theory with a scalar field non-minimally-coupled to gravity, we look for solutions that describe novel black-string or maximally-symmetric solutions in the bulk. The brane line-element is found to describe a Schwarzschild-(Anti)-de Sitter spacetime, and, here, we choose to study sol... |
gr-qc/0510003 | Harihar Behera | Harihar Behera | Newtonian Gravitomagnetism and analysis of Earth Satellite Results | 15 pages, Revised and Updated | null | null | null | gr-qc | null | The possibility of a Newtonian gravitomagnetic field is considered here with
its immediate and far-reaching implications for the interpretation of 2004
LAGEOS experimental results confirming the general relativistic prediction of
Lense-Thirring effect.
| [
{
"created": "Sat, 1 Oct 2005 08:46:17 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jan 2006 08:16:29 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Behera",
"Harihar",
""
]
] | The possibility of a Newtonian gravitomagnetic field is considered here with its immediate and far-reaching implications for the interpretation of 2004 LAGEOS experimental results confirming the general relativistic prediction of Lense-Thirring effect. |
1806.06240 | Cosimo Bambi | Jinye Yang, Dimitry Ayzenberg, Cosimo Bambi | Iron Line Spectroscopy of Black Holes in Vector-Tensor Galileons
Modified Gravity | 11 pages, 6 figures. v2: fixed a few typos | Phys. Rev. D 98, 044024 (2018) | 10.1103/PhysRevD.98.044024 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a rotating black hole solution was found in Vector-Tensor Galileons
modified gravity that has some significant differences from the Kerr black hole
solution. We study the iron line shape that is part of the reflection spectrum
of accretion disks around black holes in this new black hole solution. We
simulat... | [
{
"created": "Sat, 16 Jun 2018 12:59:23 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Aug 2018 07:12:21 GMT",
"version": "v2"
}
] | 2018-08-16 | [
[
"Yang",
"Jinye",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
]
] | Recently, a rotating black hole solution was found in Vector-Tensor Galileons modified gravity that has some significant differences from the Kerr black hole solution. We study the iron line shape that is part of the reflection spectrum of accretion disks around black holes in this new black hole solution. We simulate ... |
gr-qc/0112021 | Gianluca Gemme | G. Gemme, A. Chincarini, R. Parodi, Ph. Bernard and E. Picasso | Parametric gravity wave detector | 9 pages, 6 figures. Talk given at the Workshop on Electromagnetic
Probes of Fundamentals Physics, Erice (Italy), October 2001 | null | null | null | gr-qc | null | Since 1978 superconducting coupled cavities have been proposed as a sensitive
detector of gravitational waves. The interaction of the gravitational wave with
the cavity walls, and the esulting motion, induces the transition of some
energy from an initially excited cavity mode to an empty one. The energy
transfer is m... | [
{
"created": "Tue, 11 Dec 2001 09:26:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gemme",
"G.",
""
],
[
"Chincarini",
"A.",
""
],
[
"Parodi",
"R.",
""
],
[
"Bernard",
"Ph.",
""
],
[
"Picasso",
"E.",
""
]
] | Since 1978 superconducting coupled cavities have been proposed as a sensitive detector of gravitational waves. The interaction of the gravitational wave with the cavity walls, and the esulting motion, induces the transition of some energy from an initially excited cavity mode to an empty one. The energy transfer is max... |
1102.1785 | Tomohiro Takahashi | Tomohiro Takahashi | Fatal Effects of Charges on Stability of Black Holes in Lovelock Theory | 22 pages, 17 figures, using PTP format; v2: references added | Prog.Theor.Phys.125:1289-1310,2011 | 10.1143/PTP.125.1289 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the stability of static spherically symmetric charged black holes
under tensor type perturbations in Lovelock theory which is a natural higher
dimensional generalization of Einstein theory. We derive the master equation
for tensor type perturbations and present the criterions for the stability.
Examining the... | [
{
"created": "Wed, 9 Feb 2011 05:24:17 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2011 08:56:52 GMT",
"version": "v2"
}
] | 2015-03-18 | [
[
"Takahashi",
"Tomohiro",
""
]
] | We study the stability of static spherically symmetric charged black holes under tensor type perturbations in Lovelock theory which is a natural higher dimensional generalization of Einstein theory. We derive the master equation for tensor type perturbations and present the criterions for the stability. Examining these... |
1904.11216 | Marcus Werner | Marcus C. Werner | Gravitational lensing in area metric spacetimes | 6 pages. For Proceedings of the 15th Marcel Grossmann Meeting (2018),
session PT2 | null | null | YITP-19-38 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider light propagation as a probe of non-metricity in area metric
spacetimes, and find a deviation from the standard Etherington relation for
linearized area metric Schwarzschild. This is joint work with Frederic P.
Schuller (Erlangen University).
| [
{
"created": "Thu, 25 Apr 2019 08:50:12 GMT",
"version": "v1"
}
] | 2019-04-26 | [
[
"Werner",
"Marcus C.",
""
]
] | We consider light propagation as a probe of non-metricity in area metric spacetimes, and find a deviation from the standard Etherington relation for linearized area metric Schwarzschild. This is joint work with Frederic P. Schuller (Erlangen University). |
2307.00621 | Ivan Dimitrijevic | Ivan Dimitrijevic | Some exact anisotropic cosmological solutions of a simple nonlocal de
Sitter gravity | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | It was shown recently that a very simple nonlocal de Sitter gravity model
contains exact vacuum cosmological solution which mimics dark energy and dark
matter in flat space. Some other interesting solutions have been also found. In
this paper we proceed with finding several new exact cosmological solutions
which belo... | [
{
"created": "Sun, 2 Jul 2023 17:25:17 GMT",
"version": "v1"
}
] | 2023-07-04 | [
[
"Dimitrijevic",
"Ivan",
""
]
] | It was shown recently that a very simple nonlocal de Sitter gravity model contains exact vacuum cosmological solution which mimics dark energy and dark matter in flat space. Some other interesting solutions have been also found. In this paper we proceed with finding several new exact cosmological solutions which belong... |
gr-qc/0702106 | Harald P. Pfeiffer | Harald P. Pfeiffer, Duncan A. Brown, Lawrence E. Kidder, Lee Lindblom,
Geoffrey Lovelace, Mark A. Scheel | Reducing orbital eccentricity in binary black hole simulations | 27 pages, 9 figures; various minor clarifications; accepted to the
"New Frontiers" special issue of CQG | Class.Quant.Grav.24:S59-S82,2007 | 10.1088/0264-9381/24/12/S06 | null | gr-qc | null | Binary black hole simulations starting from quasi-circular (i.e., zero radial
velocity) initial data have orbits with small but non-zero orbital
eccentricities. In this paper the quasi-equilibrium initial-data method is
extended to allow non-zero radial velocities to be specified in binary black
hole initial data. Ne... | [
{
"created": "Tue, 20 Feb 2007 00:50:43 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Apr 2007 16:12:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Pfeiffer",
"Harald P.",
""
],
[
"Brown",
"Duncan A.",
""
],
[
"Kidder",
"Lawrence E.",
""
],
[
"Lindblom",
"Lee",
""
],
[
"Lovelace",
"Geoffrey",
""
],
[
"Scheel",
"Mark A.",
""
]
] | Binary black hole simulations starting from quasi-circular (i.e., zero radial velocity) initial data have orbits with small but non-zero orbital eccentricities. In this paper the quasi-equilibrium initial-data method is extended to allow non-zero radial velocities to be specified in binary black hole initial data. New ... |
1211.6212 | Antonino Flachi | Antonino Flachi and Jos\'e P. S. Lemos | Quasinormal modes of regular black holes | 10 pages; 13 figures | Phys. Rev. D 87 024034 (2013) | 10.1103/PhysRevD.87.024034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole quasinormal frequencies are complex numbers that encode
information on how a black hole relaxes after it has been perturbed and depend
on the features of the geometry and on the type of perturbations. On the one
hand, the examples studied so far in the literature focused on the case of
black hole geometrie... | [
{
"created": "Tue, 27 Nov 2012 04:36:39 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jan 2013 15:27:24 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Flachi",
"Antonino",
""
],
[
"Lemos",
"José P. S.",
""
]
] | Black hole quasinormal frequencies are complex numbers that encode information on how a black hole relaxes after it has been perturbed and depend on the features of the geometry and on the type of perturbations. On the one hand, the examples studied so far in the literature focused on the case of black hole geometries ... |
1102.4755 | Haiyun Huang | Haiyun Huang, Yongge Ma, and Li Qin | Path Integral and Effective Hamiltonian in Loop Quantum Cosmology | 11 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the path integral formulation of Friedmann universe filled with a
massless scalar field in loop quantum cosmology. All the isotropic models of
$k=0,+1,-1$ are considered. To construct the path integrals in the timeless
framework, a multiple group-averaging approach is proposed. Meanwhile, since
the transitio... | [
{
"created": "Wed, 23 Feb 2011 14:53:46 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2011 10:29:05 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jun 2011 13:51:55 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Jun 2011 02:16:18 GMT",
"version": "v4"
}
] | 2011-06-28 | [
[
"Huang",
"Haiyun",
""
],
[
"Ma",
"Yongge",
""
],
[
"Qin",
"Li",
""
]
] | We study the path integral formulation of Friedmann universe filled with a massless scalar field in loop quantum cosmology. All the isotropic models of $k=0,+1,-1$ are considered. To construct the path integrals in the timeless framework, a multiple group-averaging approach is proposed. Meanwhile, since the transition ... |
gr-qc/0302072 | Manuel Tiglio | Gioel Calabrese, Luis Lehner, David Neilsen, Jorge Pullin, Oscar
Reula, Olivier Sarbach, Manuel Tiglio | Novel finite-differencing techniques for numerical relativity:
application to black hole excision | 4 pages, RevTex, 2 figures | Class.Quant.Grav. 20 (2003) L245-L252 | 10.1088/0264-9381/20/20/102 | LSU-REL-021703 | gr-qc | null | We use rigorous techniques from numerical analysis of hyperbolic equations in
bounded domains to construct stable finite-difference schemes for Numerical
Relativity, in particular for their use in black hole excision. As an
application, we present 3D simulations of a scalar field propagating in a
Schwarzschild black ... | [
{
"created": "Tue, 18 Feb 2003 03:19:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Calabrese",
"Gioel",
""
],
[
"Lehner",
"Luis",
""
],
[
"Neilsen",
"David",
""
],
[
"Pullin",
"Jorge",
""
],
[
"Reula",
"Oscar",
""
],
[
"Sarbach",
"Olivier",
""
],
[
"Tiglio",
"Manuel",
""
]
] | We use rigorous techniques from numerical analysis of hyperbolic equations in bounded domains to construct stable finite-difference schemes for Numerical Relativity, in particular for their use in black hole excision. As an application, we present 3D simulations of a scalar field propagating in a Schwarzschild black ho... |
2310.15382 | Marco Galoppo | Marco Galoppo | Topological constraints on general relativistic galaxies: Exploring
novel conical singularity networks | 13 pages, 1 figure | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The van Stockum-Bonner class of spacetimes can be interpreted as fully
general relativistic models for rigidly rotating disc galaxies. Frame-dragging
effects in these geometries demand a recalibration of the dark matter content
relative to models based on Newtonian gravity. We investigate the previously
overlooked to... | [
{
"created": "Mon, 23 Oct 2023 21:59:33 GMT",
"version": "v1"
}
] | 2023-10-25 | [
[
"Galoppo",
"Marco",
""
]
] | The van Stockum-Bonner class of spacetimes can be interpreted as fully general relativistic models for rigidly rotating disc galaxies. Frame-dragging effects in these geometries demand a recalibration of the dark matter content relative to models based on Newtonian gravity. We investigate the previously overlooked topo... |
1309.1546 | Patryk Mach | Patryk Mach, Edward Malec | Stability of relativistic Bondi accretion in Schwarzschild-(anti-)de
Sitter spacetimes | 6 pages | null | 10.1103/PhysRevD.88.084055 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper we investigated stationary, relativistic Bondi-type
accretion in Schwarzschild-(anti-)de Sitter spacetimes. Here we study their
stability, using the method developed by Moncrief. The analysis applies to
perturbations satisfying the potential flow condition. We prove that global
isothermal flows in S... | [
{
"created": "Fri, 6 Sep 2013 06:42:34 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Mach",
"Patryk",
""
],
[
"Malec",
"Edward",
""
]
] | In a recent paper we investigated stationary, relativistic Bondi-type accretion in Schwarzschild-(anti-)de Sitter spacetimes. Here we study their stability, using the method developed by Moncrief. The analysis applies to perturbations satisfying the potential flow condition. We prove that global isothermal flows in Sch... |
gr-qc/0502046 | Ian G. Moss | M. Giammatteo and I.G. Moss | Gravitational quasinormal modes for Kerr Anti-de Sitter black holes | 20 pages, 13 figures, ReVTeX | Class.Quant.Grav.22:1803-1824,2005 | 10.1088/0264-9381/22/9/021 | null | gr-qc | null | We investigate the quasinormal modes for gravitational perturbations of
rotating black holes in four dimensional Anti-de Sitter (AdS) spacetime. The
study of the quasinormal frequencies related to these modes is relevant to the
AdS/CFT correspondence. Although results have been obtained for Schwarzschild
and Reissner... | [
{
"created": "Thu, 10 Feb 2005 16:19:45 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Feb 2005 10:07:45 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Giammatteo",
"M.",
""
],
[
"Moss",
"I. G.",
""
]
] | We investigate the quasinormal modes for gravitational perturbations of rotating black holes in four dimensional Anti-de Sitter (AdS) spacetime. The study of the quasinormal frequencies related to these modes is relevant to the AdS/CFT correspondence. Although results have been obtained for Schwarzschild and Reissner-N... |
1512.01216 | Aaron S. Chou | Aaron S. Chou, Richard Gustafson, Craig Hogan, Brittany Kamai, Ohkyung
Kwon, Robert Lanza, Lee McCuller, Stephan S. Meyer, Jonathan Richardson,
Chris Stoughton, Raymond Tomlin, Samuel Waldman, Rainer Weiss | First measurements of high frequency cross-spectra from a pair of large
Michelson interferometers | 5 pages, 3 figures | Phys.Rev.Lett. 117 (2016) no.11, 111102 | 10.1103/PhysRevLett.117.111102 | FERMILAB-PUB-16-217-AE | gr-qc hep-ex physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Measurements are reported of the cross-correlation of spectra of differential
position signals from the Fermilab Holometer, a pair of co-located 39 m long,
high power Michelson interferometers with flat, broadband frequency response in
the MHz range. The instrument obtains sensitivity to high frequency correlated
sig... | [
{
"created": "Thu, 3 Dec 2015 20:26:57 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2017 18:06:27 GMT",
"version": "v2"
}
] | 2017-01-19 | [
[
"Chou",
"Aaron S.",
""
],
[
"Gustafson",
"Richard",
""
],
[
"Hogan",
"Craig",
""
],
[
"Kamai",
"Brittany",
""
],
[
"Kwon",
"Ohkyung",
""
],
[
"Lanza",
"Robert",
""
],
[
"McCuller",
"Lee",
""
],
[
"M... | Measurements are reported of the cross-correlation of spectra of differential position signals from the Fermilab Holometer, a pair of co-located 39 m long, high power Michelson interferometers with flat, broadband frequency response in the MHz range. The instrument obtains sensitivity to high frequency correlated signa... |
2211.12357 | Genly Le\'on | Genly Leon (Catolica del Norte U. and DUT, Durban), Alfredo D. Millano
(Catolica del Norte U.), Andronikos Paliathanasis (DUT, Durban and Catolica
del Norte U.) | Scalar Field cosmology from a Modified Poisson Algebra | 13 pages, 8 compound figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the phase space of a scalar field theory obtained by
minisuperspace deformation. We consider quintessence or phantom scalar fields
in the action which arise from minisuperspace deformation on the
Einstein-Hilbert action. We use a modified Poisson Algebra where Poisson
brackets are the $\alpha$-deformed... | [
{
"created": "Tue, 22 Nov 2022 15:50:34 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Leon",
"Genly",
"",
"Catolica del Norte U. and DUT, Durban"
],
[
"Millano",
"Alfredo D.",
"",
"Catolica del Norte U."
],
[
"Paliathanasis",
"Andronikos",
"",
"DUT, Durban and Catolica\n del Norte U."
]
] | We investigate the phase space of a scalar field theory obtained by minisuperspace deformation. We consider quintessence or phantom scalar fields in the action which arise from minisuperspace deformation on the Einstein-Hilbert action. We use a modified Poisson Algebra where Poisson brackets are the $\alpha$-deformed o... |
2208.07786 | Eric Ling | Eric Ling and Annachiara Piubello | On the asymptotic assumptions for Milne-like spacetimes | 14 pages, 1 figure | null | 10.1007/s10714-023-03102-x | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Milne-like spacetimes are a class of hyperbolic FLRW spacetimes which admit
continuous spacetime extensions through the big bang, $\tau = 0$. The existence
of the extension follows from writing the metric in conformal Minkowskian
coordinates and assuming that the scale factor satisfies $a(\tau) = \tau +
o(\tau^{1+\va... | [
{
"created": "Tue, 16 Aug 2022 14:54:53 GMT",
"version": "v1"
}
] | 2023-04-05 | [
[
"Ling",
"Eric",
""
],
[
"Piubello",
"Annachiara",
""
]
] | Milne-like spacetimes are a class of hyperbolic FLRW spacetimes which admit continuous spacetime extensions through the big bang, $\tau = 0$. The existence of the extension follows from writing the metric in conformal Minkowskian coordinates and assuming that the scale factor satisfies $a(\tau) = \tau + o(\tau^{1+\vare... |
2311.05543 | Eungwang Seo | Eungwang Seo, Tjonnie Guan Feng Li, Martin Anthony Hendry | Inferring properties of dark galactic halos using strongly lensed
gravitational waves | 12 pages, 9 figures | null | null | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves (GWs) can be deflected, similarly to electromagnetic (EM)
waves, by massive objects through the phenomenon of gravitational lensing. The
importance of gravitational lensing for GW astronomy is becoming increasingly
apparent in the GW detection era, in which nearly 100 events have already been
dete... | [
{
"created": "Thu, 9 Nov 2023 17:44:59 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2024 03:53:48 GMT",
"version": "v2"
}
] | 2024-04-08 | [
[
"Seo",
"Eungwang",
""
],
[
"Li",
"Tjonnie Guan Feng",
""
],
[
"Hendry",
"Martin Anthony",
""
]
] | Gravitational waves (GWs) can be deflected, similarly to electromagnetic (EM) waves, by massive objects through the phenomenon of gravitational lensing. The importance of gravitational lensing for GW astronomy is becoming increasingly apparent in the GW detection era, in which nearly 100 events have already been detect... |
1006.4296 | Cosimo Bambi | Cosimo Bambi, Naoki Yoshida | 3D simulations of the accretion process in Kerr space-time with
arbitrary value of the spin parameter | 13 pages, 9 figures. v2: refereed version | Phys.Rev.D82:064002,2010 | 10.1103/PhysRevD.82.064002 | IPMU10-0097 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of three-dimensional general relativistic hydrodynamic
simulations of adiabatic and spherically symmetric accretion in Kerr
space-time. We consider compact objects with spin parameter $|a_*| \le 1$
(black holes) and with $|a_*| > 1$ (super-spinars). Our full three-dimensional
simulations confir... | [
{
"created": "Tue, 22 Jun 2010 13:58:59 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Aug 2010 00:14:56 GMT",
"version": "v2"
}
] | 2010-09-06 | [
[
"Bambi",
"Cosimo",
""
],
[
"Yoshida",
"Naoki",
""
]
] | We present the results of three-dimensional general relativistic hydrodynamic simulations of adiabatic and spherically symmetric accretion in Kerr space-time. We consider compact objects with spin parameter $|a_*| \le 1$ (black holes) and with $|a_*| > 1$ (super-spinars). Our full three-dimensional simulations confirm ... |
1306.6172 | Grigory Vereshkov | Leonid Marochnik, Daniel Usikov, Grigory Vereshkov | Macroscopic effect of quantum gravity: graviton, ghost and instanton
condensation on horizon scale of the Universe | The paper is a shortened and modified version of arXiv:0811.4484. The
quantum-gravity phase transitions are described as continuous ones | J. of Mod. Phys. 4, 48-101 (2013) | 10.4236/jmp.2013.48A007 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a special class of quantum gravity phenomena that occur on the
scale of the Universe as a whole at any stage of its evolution. These phenomena
are a direct consequence of the zero rest mass of gravitons, conformal
non-invariance of the graviton field, and one-loop finiteness of quantum
gravity. The effects... | [
{
"created": "Wed, 26 Jun 2013 09:03:54 GMT",
"version": "v1"
}
] | 2013-09-03 | [
[
"Marochnik",
"Leonid",
""
],
[
"Usikov",
"Daniel",
""
],
[
"Vereshkov",
"Grigory",
""
]
] | We discuss a special class of quantum gravity phenomena that occur on the scale of the Universe as a whole at any stage of its evolution. These phenomena are a direct consequence of the zero rest mass of gravitons, conformal non-invariance of the graviton field, and one-loop finiteness of quantum gravity. The effects a... |
2010.01744 | Andr\'es Ace\~na | Andr\'es Ace\~na and Ivan Gentile de Austria | Spherically symmetric linear perturbations of electrically counterpoised
dust | 12 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider spherically symmetric linear perturbations of static spherically
symmetric spacetimes where the matter content is ellectrically counterpoised
dust. We show that the evolution equation for the fluid perturbation implies
that the fluid elements move with constant velocities. Therefore there are
neither osci... | [
{
"created": "Mon, 5 Oct 2020 02:13:58 GMT",
"version": "v1"
}
] | 2020-10-06 | [
[
"Aceña",
"Andrés",
""
],
[
"de Austria",
"Ivan Gentile",
""
]
] | We consider spherically symmetric linear perturbations of static spherically symmetric spacetimes where the matter content is ellectrically counterpoised dust. We show that the evolution equation for the fluid perturbation implies that the fluid elements move with constant velocities. Therefore there are neither oscill... |
gr-qc/0212027 | Virginia Re | Virginia Re, Marco Bruni, David R. Matravers and Frances T. White | Transverse frames for Petrov type I spacetimes: a general algebraic
procedure | 10 pages, submitted to Classical Quantum Gravity | Gen.Rel.Grav. 35 (2003) 1351-1363 | 10.1023/A:1024574316278 | null | gr-qc | null | We develop an algebraic procedure to rotate a general Newman-Penrose tetrad
in a Petrov type I spacetime into a frame with Weyl scalars $\Psi_{1}$ and
$\Psi_{3}$ equal to zero, assuming that initially all the Weyl scalars are non
vanishing. The new frame highlights the physical properties of the spacetime.
In particu... | [
{
"created": "Thu, 5 Dec 2002 19:06:35 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Re",
"Virginia",
""
],
[
"Bruni",
"Marco",
""
],
[
"Matravers",
"David R.",
""
],
[
"White",
"Frances T.",
""
]
] | We develop an algebraic procedure to rotate a general Newman-Penrose tetrad in a Petrov type I spacetime into a frame with Weyl scalars $\Psi_{1}$ and $\Psi_{3}$ equal to zero, assuming that initially all the Weyl scalars are non vanishing. The new frame highlights the physical properties of the spacetime. In particula... |
2305.08145 | Mouhssine Koussour | S.A. Narawade, M. Koussour, and B. Mishra | Constrained $f(Q,T)$ gravity accelerating cosmological model and its
dynamical system analysis | Nuclear Physics B published version | Nuclear Physics B 116233 (2023) | 10.1016/j.nuclphysb.2023.116233 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have presented an accelerating cosmological model of the
Universe in an extended symmetric teleparallel gravity or $f(Q,T)$ gravity. The
parametric form of the Hubble parameter is, $H\left(z\right) =H_{0}\left[
\alpha +\left( 1-\alpha \right) \left( 1+z\right) ^{n}\right] ^{\frac{3}{2n}}$,
where $H_... | [
{
"created": "Sun, 14 May 2023 12:35:55 GMT",
"version": "v1"
}
] | 2023-05-16 | [
[
"Narawade",
"S. A.",
""
],
[
"Koussour",
"M.",
""
],
[
"Mishra",
"B.",
""
]
] | In this paper, we have presented an accelerating cosmological model of the Universe in an extended symmetric teleparallel gravity or $f(Q,T)$ gravity. The parametric form of the Hubble parameter is, $H\left(z\right) =H_{0}\left[ \alpha +\left( 1-\alpha \right) \left( 1+z\right) ^{n}\right] ^{\frac{3}{2n}}$, where $H_0$... |
1612.05302 | Mieszko Rutkowski | Mieszko Rutkowski | Collisions near Kerr black holes: lower limit of energy between orbiting
and incoming particles | 12 pages, 4 figures, accepted for publication in General Relativity
and Gravitation | General Relativity and Gravitation (2017) 49: 7 | 10.1007/s10714-016-2174-7 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our paper we investigate the lower limit of collisional energy of test
particles near the Kerr black hole. In particular we examine the minimal
Lorentz factor between the freely falling particles and the particles orbiting
around a black hole. We consider collisions on the innermost stable circular
orbit (ISCO) an... | [
{
"created": "Thu, 15 Dec 2016 23:11:43 GMT",
"version": "v1"
}
] | 2016-12-20 | [
[
"Rutkowski",
"Mieszko",
""
]
] | In our paper we investigate the lower limit of collisional energy of test particles near the Kerr black hole. In particular we examine the minimal Lorentz factor between the freely falling particles and the particles orbiting around a black hole. We consider collisions on the innermost stable circular orbit (ISCO) and ... |
gr-qc/0402108 | Mauricio Bellini | Edgar Madriz Aguilar (IFM, Michoacana University) and Mauricio Bellini
(Mar del Plata University) | Origin of FRW cosmology in slow-roll inflation from noncompact
Kaluza-Klein theory | (final version) to be published in EPJC | Eur.Phys.J. C38 (2004) 123-128 | 10.1140/epjc/s2004-02024-y | null | gr-qc astro-ph hep-ph hep-th | null | Using a recently introduced formalism we discuss slow-roll inflaton from
Kaluza-Klein theory without the cylinder condition. In particular, some
examples corresponding to polynomic and hyperbolic $\phi$-potentials are
studied. We find that the evolution of the fifth coordinate should be
determinant for both, the evol... | [
{
"created": "Tue, 24 Feb 2004 19:18:40 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2004 22:22:00 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Apr 2004 15:55:34 GMT",
"version": "v3"
},
{
"created": "Tue, 27 Apr 2004 22:54:04 GMT",
"version": "v4"
},
{
"c... | 2009-11-10 | [
[
"Aguilar",
"Edgar Madriz",
"",
"IFM, Michoacana University"
],
[
"Bellini",
"Mauricio",
"",
"Mar del Plata University"
]
] | Using a recently introduced formalism we discuss slow-roll inflaton from Kaluza-Klein theory without the cylinder condition. In particular, some examples corresponding to polynomic and hyperbolic $\phi$-potentials are studied. We find that the evolution of the fifth coordinate should be determinant for both, the evolut... |
1407.7758 | Prado Martin-Moruno | Mariam Bouhmadi-Lopez, Francisco S. N. Lobo, Prado Martin-Moruno | Wormholes minimally violating the null energy condition | V1: 24 pages, 7 figures. V2: 26 pages, 7 figures. References added,
some discussion added, a typo fixed. This version accepted for publication in
JCAP | JCAP 1411 (2014) 007 | 10.1088/1475-7516/2014/11/007 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider novel wormhole solutions supported by a matter content that
minimally violates the null energy condition. More specifically, we consider an
equation of state in which the sum of the energy density and radial pressure is
proportional to a constant with a value smaller than that of the inverse area
characte... | [
{
"created": "Tue, 29 Jul 2014 15:41:19 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 2014 09:10:39 GMT",
"version": "v2"
}
] | 2014-11-10 | [
[
"Bouhmadi-Lopez",
"Mariam",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Martin-Moruno",
"Prado",
""
]
] | We consider novel wormhole solutions supported by a matter content that minimally violates the null energy condition. More specifically, we consider an equation of state in which the sum of the energy density and radial pressure is proportional to a constant with a value smaller than that of the inverse area characteri... |
2304.00663 | P. A. Gonzalez | Ram\'on B\'ecar, P. A. Gonz\'alez, Felipe Moncada, Yerko V\'asquez | Massive scalar field perturbations in Weyl black holes | 19 pages, and 12 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider the propagation of massive scalar fields in the
background of Weyl black holes and we mainly study the effect of the scalar
field mass in the spectrum of the quasinormal frequencies (QNFs) via the
Wentzel-Kramers-Brillouin (WKB) method, and the pseudospectral Chebyshev
method. The spectrum of... | [
{
"created": "Mon, 3 Apr 2023 00:30:02 GMT",
"version": "v1"
}
] | 2023-04-04 | [
[
"Bécar",
"Ramón",
""
],
[
"González",
"P. A.",
""
],
[
"Moncada",
"Felipe",
""
],
[
"Vásquez",
"Yerko",
""
]
] | In this work we consider the propagation of massive scalar fields in the background of Weyl black holes and we mainly study the effect of the scalar field mass in the spectrum of the quasinormal frequencies (QNFs) via the Wentzel-Kramers-Brillouin (WKB) method, and the pseudospectral Chebyshev method. The spectrum of Q... |
1605.02573 | Thomas-Paul Hack | Romeo Brunetti, Klaus Fredenhagen, Thomas-Paul Hack, Nicola Pinamonti
and Katarzyna Rejzner | Cosmological perturbation theory and quantum gravity | 18 pages | null | 10.1007/JHEP08(2016)032 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown how cosmological perturbation theory arises from a fully
quantized perturbative theory of quantum gravity. Central for the derivation is
a non-perturbative concept of gauge-invariant local observables by means of
which perturbative invariant expressions of arbitrary order are generated. In
particular, in ... | [
{
"created": "Mon, 9 May 2016 13:08:46 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Brunetti",
"Romeo",
""
],
[
"Fredenhagen",
"Klaus",
""
],
[
"Hack",
"Thomas-Paul",
""
],
[
"Pinamonti",
"Nicola",
""
],
[
"Rejzner",
"Katarzyna",
""
]
] | It is shown how cosmological perturbation theory arises from a fully quantized perturbative theory of quantum gravity. Central for the derivation is a non-perturbative concept of gauge-invariant local observables by means of which perturbative invariant expressions of arbitrary order are generated. In particular, in th... |
gr-qc/9212002 | Roberto De Pietri | R. De Pietri, L. Lusanna, M. Pauri | Galilean Theories of Gravitation | 8 pages, TeX + 2 latex figure at the end | null | null | null | gr-qc | null | A generalization of Newtonian gravitation theory is obtained by a suitable
limiting procedure from the ADM action of general relativity coupled to a
mass-point. Three particular theories are discussed and it is found that two of
them are invariant under an extended Galilei gauge group.
| [
{
"created": "Thu, 3 Dec 1992 09:56:45 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Dec 1992 17:04:19 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"De Pietri",
"R.",
""
],
[
"Lusanna",
"L.",
""
],
[
"Pauri",
"M.",
""
]
] | A generalization of Newtonian gravitation theory is obtained by a suitable limiting procedure from the ADM action of general relativity coupled to a mass-point. Three particular theories are discussed and it is found that two of them are invariant under an extended Galilei gauge group. |
gr-qc/9912089 | Gaetano Lambiase | A. Feoli, G. Lambiase, G. Papini, G. Scarpetta | Schwarzschild Field with Maximal Acceleration Corrections | 12 pages, 4 figures, to appear on Phys. Lett. A | Phys.Lett. A263 (1999) 147-153 | 10.1016/S0375-9601(99)00706-9 | null | gr-qc | null | We consider a model in which accelerated particles experience line--elements
with maximal acceleration corrections. When applied to the Schwarzschild
metric, the effective field experienced by accelerated test particles contains
corrections that vanish in the limit $\hbar\to 0$, but otherwise affect the
behaviour of ... | [
{
"created": "Tue, 21 Dec 1999 12:43:37 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Feoli",
"A.",
""
],
[
"Lambiase",
"G.",
""
],
[
"Papini",
"G.",
""
],
[
"Scarpetta",
"G.",
""
]
] | We consider a model in which accelerated particles experience line--elements with maximal acceleration corrections. When applied to the Schwarzschild metric, the effective field experienced by accelerated test particles contains corrections that vanish in the limit $\hbar\to 0$, but otherwise affect the behaviour of ma... |
1610.05822 | Valerio Faraoni | Valerio Faraoni, George F.R. Ellis, Javad T. Firouzjaee, Alexis Helou,
and Ilia Musco | Foliation dependence of black hole apparent horizons in spherical
symmetry | 21pages, comments welcome | Phys. Rev. D 95, 024008 (2017) | 10.1103/PhysRevD.95.024008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical studies of gravitational collapse to black holes make use of
apparent horizons, which are intrinsically foliation-dependent. We expose the
problem and discuss possible solutions using the Hawking quasilocal mass. In
spherical symmetry, we present a physically sensible approach to the problem by
restricting ... | [
{
"created": "Tue, 18 Oct 2016 22:46:31 GMT",
"version": "v1"
}
] | 2017-01-11 | [
[
"Faraoni",
"Valerio",
""
],
[
"Ellis",
"George F. R.",
""
],
[
"Firouzjaee",
"Javad T.",
""
],
[
"Helou",
"Alexis",
""
],
[
"Musco",
"Ilia",
""
]
] | Numerical studies of gravitational collapse to black holes make use of apparent horizons, which are intrinsically foliation-dependent. We expose the problem and discuss possible solutions using the Hawking quasilocal mass. In spherical symmetry, we present a physically sensible approach to the problem by restricting to... |
gr-qc/9706016 | Milan Mijic | Milan Mijic | Quantum Squeezing and Late Time Classical Behavior of Massive Fields in
Expanding Robertson-Walker Universe | 10 pages, Latex. Accepted for Int. J. of Mod. Phys. D | Int.J.Mod.Phys. D6 (1997) 505-514 | 10.1142/S0218271897000303 | null | gr-qc | null | A Schroedinger picture analysis of time dependent quantum oscillators, in a
manner of Guth and Pi, clearly identifies two physical mechanisms for possible
decoherence of vacuum fluctuations in early universe: turning of quantum
oscillators upside-down, and rapid squeezing of upside-right oscillators so
that certain s... | [
{
"created": "Thu, 5 Jun 1997 17:48:09 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Mijic",
"Milan",
""
]
] | A Schroedinger picture analysis of time dependent quantum oscillators, in a manner of Guth and Pi, clearly identifies two physical mechanisms for possible decoherence of vacuum fluctuations in early universe: turning of quantum oscillators upside-down, and rapid squeezing of upside-right oscillators so that certain squ... |
2206.12988 | Amodio Carleo | Amodio Carleo, Gaetano Lambiase, Leonardo Mastrototaro | Energy Extraction via Magnetic Reconnection in Lorentz breaking Kerr-Sen
and Kiselev Black Holes | null | null | 10.1140/epjc/s10052-022-10751-w | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes can accumulate a large amount of energy, responsible for highly
energetic astrophysical phenomena
Recently, fast magnetic reconnection (MR) of the magnetic field was proposed
as a new way to extract energy and in this paper, we investigate this phenomena
in a bumblebee Kerr-Sen BH. We find that the pres... | [
{
"created": "Sun, 26 Jun 2022 22:56:20 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Carleo",
"Amodio",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Mastrototaro",
"Leonardo",
""
]
] | Black holes can accumulate a large amount of energy, responsible for highly energetic astrophysical phenomena Recently, fast magnetic reconnection (MR) of the magnetic field was proposed as a new way to extract energy and in this paper, we investigate this phenomena in a bumblebee Kerr-Sen BH. We find that the presence... |
gr-qc/0409039 | Steven Carlip | S. Carlip | Quantum Gravity in 2+1 Dimensions: The Case of a Closed Universe | 61 pages, draft of review for Living Reviews; comments, criticisms,
additions, missing references welcome; v2: minor changes, added references | Living Rev.Rel.8:1,2005 | 10.12942/lrr-2005-1 | UCD-04-24 | gr-qc hep-th | null | In three spacetime dimensions, general relativity drastically simplifies,
becoming a ``topological'' theory with no propagating local degrees of freedom.
Nevertheless, many of the difficult conceptual problems of quantizing gravity
are still present. In this review, I summarize the rather large body of work
that has ... | [
{
"created": "Wed, 8 Sep 2004 20:12:18 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 2004 23:20:40 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Carlip",
"S.",
""
]
] | In three spacetime dimensions, general relativity drastically simplifies, becoming a ``topological'' theory with no propagating local degrees of freedom. Nevertheless, many of the difficult conceptual problems of quantizing gravity are still present. In this review, I summarize the rather large body of work that has go... |
1205.1256 | Edward Anderson | Edward Anderson | Relationalism | This is the material from my invited seminars at 'Categories and
Physics 2012' in Paris and 'Conformal Nature of the Universe 2013' at
Perimeter Institute, Waterloo. 39 pages, 4 figures. arXiv admin note:
substantial text overlap with arXiv:1111.1472 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article contributes to the debate of the meaning of relationalism and
background independence, which has remained of interest in theoretical physics
from Newton versus Leibniz through to foundational issues for today's leading
candidate theories of quantum gravity. I contrast and compose the substantially
differ... | [
{
"created": "Sun, 6 May 2012 23:52:28 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2012 17:03:22 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Jul 2014 10:41:05 GMT",
"version": "v3"
}
] | 2014-07-16 | [
[
"Anderson",
"Edward",
""
]
] | This article contributes to the debate of the meaning of relationalism and background independence, which has remained of interest in theoretical physics from Newton versus Leibniz through to foundational issues for today's leading candidate theories of quantum gravity. I contrast and compose the substantially differen... |
1502.07758 | Jonathan Blackman | Jonathan Blackman, Scott E. Field, Chad R. Galley, Bela Szilagyi, Mark
A. Scheel, Manuel Tiglio, Daniel A. Hemberger | Fast and accurate prediction of numerical relativity waveforms from
binary black hole coalescences using surrogate models | Updated to published version, which includes a section comparing the
surrogate and effective-one-body models. The surrogate is publicly available
for download at http://www.black-holes.org/surrogates/ . 6 pages, 6 figures | Phys. Rev. Lett. 115, 121102 (2015) | 10.1103/PhysRevLett.115.121102 | null | gr-qc astro-ph.HE cs.CE physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simulating a binary black hole (BBH) coalescence by solving Einstein's
equations is computationally expensive, requiring days to months of
supercomputing time. Using reduced order modeling techniques, we construct an
accurate surrogate model, which is evaluated in a millisecond to a second, for
numerical relativity (... | [
{
"created": "Thu, 26 Feb 2015 21:01:55 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 2015 21:42:57 GMT",
"version": "v2"
}
] | 2015-10-09 | [
[
"Blackman",
"Jonathan",
""
],
[
"Field",
"Scott E.",
""
],
[
"Galley",
"Chad R.",
""
],
[
"Szilagyi",
"Bela",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Tiglio",
"Manuel",
""
],
[
"Hemberger",
"Daniel A.",
""
... | Simulating a binary black hole (BBH) coalescence by solving Einstein's equations is computationally expensive, requiring days to months of supercomputing time. Using reduced order modeling techniques, we construct an accurate surrogate model, which is evaluated in a millisecond to a second, for numerical relativity (NR... |
1601.01939 | Alexander Zhuk | Alexander Zhuk | Perfect fluids coupled to inhomogeneities in the late Universe | This mini review (based on papers arXiv: 1301.0418; 1502.04693;
1509.06963) is a contribution to a special issue of Gravitation&Cosmology
devoted to 100 year anniversary of K.P. Stanyukovich | Gravitation and Cosmology, Vol. 22, No. 2 (2016) 159-165 | 10.1134/S0202289316020183 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Universe at the late stage of its evolution and deep inside
the cell of uniformity. At such scales, the Universe is highly inhomogeneous
and is filled with inhomogeneities in the form of galaxies and the groups of
galaxies. We also suggest that the Universe is filled with a perfect fluid, and
its fluc... | [
{
"created": "Fri, 8 Jan 2016 16:50:07 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Zhuk",
"Alexander",
""
]
] | We consider the Universe at the late stage of its evolution and deep inside the cell of uniformity. At such scales, the Universe is highly inhomogeneous and is filled with inhomogeneities in the form of galaxies and the groups of galaxies. We also suggest that the Universe is filled with a perfect fluid, and its fluctu... |
gr-qc/0605051 | Paulo Roberto Silva | P.R. Silva | A Note on Black Hole Temperature and Entropy | 5 pages, 1 figure, short note | null | null | null | gr-qc | null | We propose intuitive derivations of the Hawking temperature and the
Bekenstein-Hawking entropy of a Schwarzschild black hole.
| [
{
"created": "Tue, 9 May 2006 14:40:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Silva",
"P. R.",
""
]
] | We propose intuitive derivations of the Hawking temperature and the Bekenstein-Hawking entropy of a Schwarzschild black hole. |
1409.0884 | Scott Fraser | Scott Fraser, Douglas M. Eardley | Stability and Binding Energy of Small Asymptotically Randall-Sundrum
Black Holes | 12 pages, 7 figures, REVTeX 4.1; added new section VII; matches
published version. This paper draws on arXiv:1408.4425 | Phys. Rev. D 92, 024032 (2015) | 10.1103/PhysRevD.92.024032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the binding of a small black hole to a positive-tension brane in the
second Randall-Sundrum scenario (RS2) with orbifold symmetry. We find that a
small black hole on the brane has substantial gravitational binding energy to
the brane, and is stable against escaping into the bulk. This result can be
applied i... | [
{
"created": "Tue, 2 Sep 2014 20:33:27 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Sep 2014 20:57:25 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jul 2015 00:31:14 GMT",
"version": "v3"
}
] | 2015-07-29 | [
[
"Fraser",
"Scott",
""
],
[
"Eardley",
"Douglas M.",
""
]
] | We study the binding of a small black hole to a positive-tension brane in the second Randall-Sundrum scenario (RS2) with orbifold symmetry. We find that a small black hole on the brane has substantial gravitational binding energy to the brane, and is stable against escaping into the bulk. This result can be applied in ... |
1708.06725 | Kimet Jusufi | Kimet Jusufi, Ali \"Ovg\"un | Gravitational Lensing by Rotating Wormholes | Accepted for publication in Physical Review D | Phys. Rev. D 97, 024042 (2018) | 10.1103/PhysRevD.97.024042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper the deflection angle of light by a rotating Teo wormhole
spacetime is calculated in the weak limit approximation. We mainly focus on the
weak deflection angle by revealing the gravitational lensing as a partially
global topological effect. We apply the Gauss-Bonnet theorem (GBT) to the
optical geometry ... | [
{
"created": "Tue, 22 Aug 2017 17:06:36 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jan 2018 23:45:10 GMT",
"version": "v2"
}
] | 2018-01-31 | [
[
"Jusufi",
"Kimet",
""
],
[
"Övgün",
"Ali",
""
]
] | In this paper the deflection angle of light by a rotating Teo wormhole spacetime is calculated in the weak limit approximation. We mainly focus on the weak deflection angle by revealing the gravitational lensing as a partially global topological effect. We apply the Gauss-Bonnet theorem (GBT) to the optical geometry os... |
1906.10027 | Jose Beltran Jimenez | Jose Beltr\'an Jim\'enez, Lavinia Heisenberg, Tomi Sebastian Koivisto
and Simon Pekar | Cosmology in $f(Q)$ geometry | 15 pages, 1 figure. V2 Published version. Added clarifications and
three new appendices | Phys. Rev. D 101, 103507 (2020) | 10.1103/PhysRevD.101.103507 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The universal character of the gravitational interaction provided by the
equivalence principle motivates a geometrical description of gravity. The
standard formulation of General Relativity \`a la Einstein attributes gravity
to the spacetime curvature, to which we have grown accustomed. However, this
perception has m... | [
{
"created": "Mon, 24 Jun 2019 15:31:02 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Apr 2021 15:47:27 GMT",
"version": "v2"
}
] | 2021-04-13 | [
[
"Jiménez",
"Jose Beltrán",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Koivisto",
"Tomi Sebastian",
""
],
[
"Pekar",
"Simon",
""
]
] | The universal character of the gravitational interaction provided by the equivalence principle motivates a geometrical description of gravity. The standard formulation of General Relativity \`a la Einstein attributes gravity to the spacetime curvature, to which we have grown accustomed. However, this perception has mas... |
2203.16635 | Roman Konoplya | Roman A. Konoplya, Alexander Zhidenko | Can the abyss swallow gravitational waves or why we do not observe
echoes? | 6 pages, 3 figures | EPL, 138 (2022) 49001 | 10.1209/0295-5075/ac6e00 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we propose a simple explanation why echoes from wormholes mimicking
black holes may be so small that they cannot be observed. The essence of the
effect is in the redistribution of the initial energy of gravitational wave
among multiple universes, connected by a wormhole.
| [
{
"created": "Wed, 30 Mar 2022 19:39:32 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"Konoplya",
"Roman A.",
""
],
[
"Zhidenko",
"Alexander",
""
]
] | Here we propose a simple explanation why echoes from wormholes mimicking black holes may be so small that they cannot be observed. The essence of the effect is in the redistribution of the initial energy of gravitational wave among multiple universes, connected by a wormhole. |
0902.4488 | Hernando Quevedo | Hernando Quevedo and Alberto Sanchez | Geometrothermodynamics of black holes in two dimensions | Final version, published in Phys. Rev. D 79, 087504 (2009) | null | 10.1103/PhysRevD.79.087504 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of two-dimensional dilatonic black holes from the
viewpoint of geometrothermodynamics. We show that the thermodynamic curvature
of the equilibrium space vanishes only in the case of a flat spacetime, and it
reproduces correctly the behavior of the thermodynamic interaction and phase
transition... | [
{
"created": "Wed, 25 Feb 2009 23:39:48 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Oct 2009 16:31:42 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Quevedo",
"Hernando",
""
],
[
"Sanchez",
"Alberto",
""
]
] | We study the properties of two-dimensional dilatonic black holes from the viewpoint of geometrothermodynamics. We show that the thermodynamic curvature of the equilibrium space vanishes only in the case of a flat spacetime, and it reproduces correctly the behavior of the thermodynamic interaction and phase transition s... |
1203.4105 | Stefano Liberati | Stefano Liberati | Lorentz breaking Effective Field Theory and observational tests | 47 pages, 4 figures. Lecture Notes for the IX SIGRAV School on
"Analogue Gravity", Como (Italy), May 2011. V.3. Typo corrected, references
added | null | 10.1007/978-3-319-00266-8_13 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analogue models of gravity have provided an experimentally realizable test
field for our ideas on quantum field theory in curved spacetimes but they have
also inspired the investigation of possible departures from exact Lorentz
invariance at microscopic scales. In this role they have joined, and sometime
anticipated,... | [
{
"created": "Mon, 19 Mar 2012 13:33:21 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2012 22:48:01 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Jul 2012 19:36:09 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Liberati",
"Stefano",
""
]
] | Analogue models of gravity have provided an experimentally realizable test field for our ideas on quantum field theory in curved spacetimes but they have also inspired the investigation of possible departures from exact Lorentz invariance at microscopic scales. In this role they have joined, and sometime anticipated, s... |
1709.06431 | Onur Gen\c{c} | Onur Gen\c{c} | Some Aspects of Morris-Thorne Wormhole in Scalar Tensor Theory | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we reach the equations of motion of Morris-Thorne wormhole
geometry by means of the Einstein Field Equations and Klein-Gordon Equation of
Scalar-Tensor theory by direct calculation. We discuss the anisotropic matter
energy distribution. We determine a relation between the radial and the
transverse pres... | [
{
"created": "Sun, 17 Sep 2017 19:10:35 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2018 18:22:42 GMT",
"version": "v2"
}
] | 2018-07-19 | [
[
"Genç",
"Onur",
""
]
] | In this study, we reach the equations of motion of Morris-Thorne wormhole geometry by means of the Einstein Field Equations and Klein-Gordon Equation of Scalar-Tensor theory by direct calculation. We discuss the anisotropic matter energy distribution. We determine a relation between the radial and the transverse pressu... |
gr-qc/0306047 | Peter Wolf | P. Wolf (1 and 2), S. Bize (2), A. Clairon (2), A.N. Luiten (3), G.
Santarelli (2), M.E. Tobar (3) ((1)Bureau International des Poids et Mesures
(2)BNM-SYRTE, Observatoire de Paris, France (3)University of Western
Australia, Australia) | Tests of Lorentz Invariance Using a Microwave Resonator: An Update | 6 pages, 2 figures, to appear in Proc. of the 2003 joint IEEE
FCS/EFTF meeting, to appear in Proc. of the 2003 Rencontres de Moriond | null | null | null | gr-qc astro-ph | null | The frequencies of a cryogenic sapphire oscillator and a hydrogen maser are
compared to set new constraints on a possible violation of Lorentz invariance.
We determine the variation of the oscillator frequency as a function of its
orientation (Michelson-Morley test) and of its velocity (Kennedy-Thorndike
test) with r... | [
{
"created": "Wed, 11 Jun 2003 16:46:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wolf",
"P.",
"",
"1 and 2"
],
[
"Bize",
"S.",
""
],
[
"Clairon",
"A.",
""
],
[
"Luiten",
"A. N.",
""
],
[
"Santarelli",
"G.",
""
],
[
"Tobar",
"M. E.",
""
]
] | The frequencies of a cryogenic sapphire oscillator and a hydrogen maser are compared to set new constraints on a possible violation of Lorentz invariance. We determine the variation of the oscillator frequency as a function of its orientation (Michelson-Morley test) and of its velocity (Kennedy-Thorndike test) with res... |
2108.09411 | Ya-Peng Hu | Shi-Bei Kong, Haximjan Abdusattar, Yihao Yin, Hongsheng Zhang and
Ya-Peng Hu | The P-V Phase Transition of the FRW Universe | 11 pages, major revision, version published in EPJC | Eur. Phys. J. C 82, 1047 (2022) | 10.1140/epjc/s10052-022-10976-9 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define thermodynamic pressure $P$ by work density $W$ as the conjugate
quantity of thermodynamic volume $V$ from field equation. We derive the
equations of state $P$=$P(V, T)$ for the Friedmann-Robertson-Walker (FRW)
universe in Einstein gravity and a modified gravity respectively. We find that
the equation of sta... | [
{
"created": "Sat, 21 Aug 2021 01:13:00 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jan 2022 14:34:24 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Jul 2022 03:00:56 GMT",
"version": "v3"
},
{
"created": "Thu, 24 Nov 2022 15:19:35 GMT",
"version": "v4"
}
] | 2022-11-28 | [
[
"Kong",
"Shi-Bei",
""
],
[
"Abdusattar",
"Haximjan",
""
],
[
"Yin",
"Yihao",
""
],
[
"Zhang",
"Hongsheng",
""
],
[
"Hu",
"Ya-Peng",
""
]
] | We define thermodynamic pressure $P$ by work density $W$ as the conjugate quantity of thermodynamic volume $V$ from field equation. We derive the equations of state $P$=$P(V, T)$ for the Friedmann-Robertson-Walker (FRW) universe in Einstein gravity and a modified gravity respectively. We find that the equation of state... |
0801.4070 | Stanislav Babak | Stanislav Babak | Building a stochastic template bank for detecting massive black hole
binaries | revtex4, 8 figures | Class.Quant.Grav.25:195011,2008 | 10.1088/0264-9381/25/19/195011 | null | gr-qc | null | Coalescence of two massive black holes is the strongest and most promising
source for LISA. In fact, gravitational signal from the end of inspiral and
merger will be detectable throughout the Universe. In this article we describe
the first step in the two-step hierarchical search for gravitational wave
signal from th... | [
{
"created": "Sat, 26 Jan 2008 11:19:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Babak",
"Stanislav",
""
]
] | Coalescence of two massive black holes is the strongest and most promising source for LISA. In fact, gravitational signal from the end of inspiral and merger will be detectable throughout the Universe. In this article we describe the first step in the two-step hierarchical search for gravitational wave signal from the ... |
2207.04230 | Alexander B. Balakin | Alexander B. Balakin and Gleb B. Kiselev | Einstein-Yang-Mills-aether theory with nonlinear axion field: Decay of
color aether and the axionic dark matter production | 17 pages, 1 figure | Symmetry, 2022, 14, 1621 | 10.3390/sym14081621 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish a nonlinear version of the SU(N) symmetric theory, which
describes self-consistently the interaction between the gravitational, gauge,
vector and pseudoscalar (axion) fields. In the context of this theory the SU(N)
symmetric multiplet of vector fields is associated with the color aether, the
decay of whi... | [
{
"created": "Sat, 9 Jul 2022 09:23:42 GMT",
"version": "v1"
}
] | 2022-08-09 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Kiselev",
"Gleb B.",
""
]
] | We establish a nonlinear version of the SU(N) symmetric theory, which describes self-consistently the interaction between the gravitational, gauge, vector and pseudoscalar (axion) fields. In the context of this theory the SU(N) symmetric multiplet of vector fields is associated with the color aether, the decay of which... |
1007.3776 | F. S. Guzman | A. Cruz-Osorio, A. Gonzalez-Juarez, F. S. Guzman, F. D. Lora-Clavijo | Numerical solution of the wave equation on particular space-times using
CMC slices and scri-fixing conformal compactification | 16 revtex4 pages, 32 eps figures, may work as an educative paper | Rev. Mex. Fis.56:456-468, 2010 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present in detail the numerical solution of the conformally
invariant wave equation on top of a fixed background space-time corresponding
to two different cases: i) 1+1 Minkowski space-time in Cartesian coordinates
and ii) Schwarzschild space-time. In both cases we use hyperboloidal constant
mean cur... | [
{
"created": "Thu, 22 Jul 2010 00:33:55 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Cruz-Osorio",
"A.",
""
],
[
"Gonzalez-Juarez",
"A.",
""
],
[
"Guzman",
"F. S.",
""
],
[
"Lora-Clavijo",
"F. D.",
""
]
] | In this paper we present in detail the numerical solution of the conformally invariant wave equation on top of a fixed background space-time corresponding to two different cases: i) 1+1 Minkowski space-time in Cartesian coordinates and ii) Schwarzschild space-time. In both cases we use hyperboloidal constant mean curva... |
1407.1958 | Yongwan Gim | Yongwan Gim and Wontae Kim | Semiclassical approach for the evaporating black hole revisited | 12 pages, many improvements, version to appear in MPLA | Mod. Phys. Lett. A, Vol. 31, No. 5 (2016) 1650033 | 10.1142/S0217732316500334 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent calculation shows that the observed energy density in the Unruh
state at the future event horizon as seen by a freely falling observer is
finite if the observer is released from rest at any positive distance outside
the horizon; however, it is getting larger and larger so that it is negatively
divergent at t... | [
{
"created": "Tue, 8 Jul 2014 05:51:57 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 2014 05:56:45 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Jan 2016 06:34:10 GMT",
"version": "v3"
}
] | 2016-01-29 | [
[
"Gim",
"Yongwan",
""
],
[
"Kim",
"Wontae",
""
]
] | A recent calculation shows that the observed energy density in the Unruh state at the future event horizon as seen by a freely falling observer is finite if the observer is released from rest at any positive distance outside the horizon; however, it is getting larger and larger so that it is negatively divergent at the... |
1504.01495 | Bob Osano | Bob Osano | Second Order perturbation Theory: A covariant approach involving a
barotropic equation of state | 29 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a covariant and gauge invariant formalism suited to the study of
second-order effects associated with higher order tensor perturbations. The
analytical method we have developed enables us to characterize pure
second-order tensor perturbations about FLRW model having different kinds of
equations of state. O... | [
{
"created": "Tue, 7 Apr 2015 07:02:37 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Mar 2017 19:32:34 GMT",
"version": "v2"
}
] | 2017-04-04 | [
[
"Osano",
"Bob",
""
]
] | We present a covariant and gauge invariant formalism suited to the study of second-order effects associated with higher order tensor perturbations. The analytical method we have developed enables us to characterize pure second-order tensor perturbations about FLRW model having different kinds of equations of state. Our... |
gr-qc/9510008 | Jong Hyun Kung | J.H. Kung | Strong Energy Condition in $R + R^2$ Gravity | Submitted to Phy. Rev. D.,15 pages, 2 figures, Latex file | Phys.Rev.D53:3017-3021,1996 | 10.1103/PhysRevD.53.3017 | null | gr-qc | null | In this paper, we study Raychaudhuri's equation in the background of $R +
\beta R^2$ gravity with a phenomenological matter ($\rho \propto a(t)^{-n}$).
We conclude that even though the Strong Energy Condition (S.E.C.) for
Einstein's gravity, which guarantees singularity, is $n\geq 2$ for $\rho
\propto a(t)^{-n}$, a p... | [
{
"created": "Wed, 4 Oct 1995 21:37:28 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Kung",
"J. H.",
""
]
] | In this paper, we study Raychaudhuri's equation in the background of $R + \beta R^2$ gravity with a phenomenological matter ($\rho \propto a(t)^{-n}$). We conclude that even though the Strong Energy Condition (S.E.C.) for Einstein's gravity, which guarantees singularity, is $n\geq 2$ for $\rho \propto a(t)^{-n}$, a per... |
1701.03256 | Hernando Quevedo | Daniel Flores-Alfonso and Hernando Quevedo | Topological Quantum Numbers of Dyonic Fields over Taub-Bolt | Final published version | Journal of Geometry and Symmetries in Physics, Vol. 44, 39-54
(2017) | 10.7546/jgsp-44-2017-39-54 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the global structure of dyonic fields on a Taub-Bolt background, and
compare our results with similar fields over Taub-NUT and Schwarzschild spaces.
It is shown that the electric and magnetic charges are quantized and lead to a
classification of dyonic Taub-Bolt configurations. The quantization condition
for... | [
{
"created": "Thu, 12 Jan 2017 06:54:01 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2017 06:37:44 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Oct 2017 12:51:46 GMT",
"version": "v3"
}
] | 2017-10-20 | [
[
"Flores-Alfonso",
"Daniel",
""
],
[
"Quevedo",
"Hernando",
""
]
] | We study the global structure of dyonic fields on a Taub-Bolt background, and compare our results with similar fields over Taub-NUT and Schwarzschild spaces. It is shown that the electric and magnetic charges are quantized and lead to a classification of dyonic Taub-Bolt configurations. The quantization condition for t... |
1012.5226 | Mariateresa Crosta | Mariateresa Crosta | Tracing light propagation to the intrinsic accuracy of space-time
geometry | 15 pages, 5 figures. Revised version, references and appendixes
added. PRD re-submitted | null | 10.1088/0264-9381/28/23/235013 | null | gr-qc astro-ph.IM math-ph math.MP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Advancement in astronomical observations and technical instrumentation
requires coding light propagation at high level of precision; this could open a
new detection window of many subtle relativistic effects suffered by light
while it is propagating and entangled in the physical measurements. Light
propagation and it... | [
{
"created": "Thu, 23 Dec 2010 15:10:38 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Feb 2011 12:06:18 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Crosta",
"Mariateresa",
""
]
] | Advancement in astronomical observations and technical instrumentation requires coding light propagation at high level of precision; this could open a new detection window of many subtle relativistic effects suffered by light while it is propagating and entangled in the physical measurements. Light propagation and its ... |
1412.7083 | Ra\"ul Vera | Borja Reina, Ra\"ul Vera | Revisiting Hartle's model using perturbed matching theory to second
order: amending the change in mass | 38 pages, two figures; two paragraphs improved with a clearer
statement, typos corrected, added two references, updated one; matches
published version | Class.Quant.Grav.32:155008,2015 | 10.1088/0264-9381/32/15/155008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hartle's model describes the equilibrium configuration of a rotating isolated
compact body in perturbation theory up to second order in General Relativity.
The interior of the body is a perfect fluid with a barotropic equation of
state, no convective motions and rigid rotation. That interior is matched
across its sur... | [
{
"created": "Mon, 22 Dec 2014 18:30:35 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Aug 2015 12:27:37 GMT",
"version": "v2"
}
] | 2015-08-11 | [
[
"Reina",
"Borja",
""
],
[
"Vera",
"Raül",
""
]
] | Hartle's model describes the equilibrium configuration of a rotating isolated compact body in perturbation theory up to second order in General Relativity. The interior of the body is a perfect fluid with a barotropic equation of state, no convective motions and rigid rotation. That interior is matched across its surfa... |
gr-qc/0601140 | Merced Montesinos | Aldo A. Martinez-Merino and Merced Montesinos | Hamilton-Jacobi theory for Hamiltonian systems with non-canonical
symplectic structures | 17 pages, no figures | Annals Phys. 321 (2006) 318-330 | 10.1016/j.aop.2005.08.008 | null | gr-qc hep-th quant-ph | null | A proposal for the Hamilton-Jacobi theory in the context of the covariant
formulation of Hamiltonian systems is done. The current approach consists in
applying Dirac's method to the corresponding action which implies the inclusion
of second-class constraints in the formalism which are handled using the
procedure of R... | [
{
"created": "Tue, 31 Jan 2006 13:48:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Martinez-Merino",
"Aldo A.",
""
],
[
"Montesinos",
"Merced",
""
]
] | A proposal for the Hamilton-Jacobi theory in the context of the covariant formulation of Hamiltonian systems is done. The current approach consists in applying Dirac's method to the corresponding action which implies the inclusion of second-class constraints in the formalism which are handled using the procedure of Rot... |
1405.4547 | Paolo Pani | Paolo Pani, Emanuele Berti | I-Love-Q, Spontaneously: Slowly Rotating Neutron Stars in Scalar-Tensor
Theories | 15 pages, 3 figures. Accompanying Mathematica notebook available at
http://blackholes.ist.utl.pt/?page=Files and
http://www.phy.olemiss.edu/~berti/research.html. v2: minor changes to match
published version | Phys. Rev. D 90, 024025 (2014) | 10.1103/PhysRevD.90.024025 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct models of slowly rotating, perfect-fluid neutron stars by
extending the classical Hartle-Thorne formalism to generic scalar-tensor
theories of gravity. Working at second order in the dimensionless angular
momentum, we compute the mass M, radius R, scalar charge q, moment of inertia I
and spin-induced qua... | [
{
"created": "Sun, 18 May 2014 20:47:40 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Jul 2014 16:27:45 GMT",
"version": "v2"
}
] | 2014-07-15 | [
[
"Pani",
"Paolo",
""
],
[
"Berti",
"Emanuele",
""
]
] | We construct models of slowly rotating, perfect-fluid neutron stars by extending the classical Hartle-Thorne formalism to generic scalar-tensor theories of gravity. Working at second order in the dimensionless angular momentum, we compute the mass M, radius R, scalar charge q, moment of inertia I and spin-induced quadr... |
gr-qc/9403030 | Ira Terwyen Phy190 | R. Graham | Chaos and Quantum Chaos in Cosmological Models | 23 pages, Latex | null | 10.1016/0960-0779(94)E0057-V | null | gr-qc | null | Spatially homogeneous cosmological models reduce to Hamiltonian systems in a
low dimensional Minkowskian space moving on the total energy shell $H=0$. Close
to the initial singularity some models (those of Bianchi type VIII and IX) can
be reduced further, in a certain approximation, to a non-compact triangular
billia... | [
{
"created": "Wed, 16 Mar 1994 12:02:41 GMT",
"version": "v1"
},
{
"created": "Tue, 17 May 1994 10:32:09 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Graham",
"R.",
""
]
] | Spatially homogeneous cosmological models reduce to Hamiltonian systems in a low dimensional Minkowskian space moving on the total energy shell $H=0$. Close to the initial singularity some models (those of Bianchi type VIII and IX) can be reduced further, in a certain approximation, to a non-compact triangular billiard... |
1906.01052 | Hossein Ghaffarnejad | Hossein Ghaffarnejad and Razieh Dehghani | Galaxy rotation curves and preferred reference frame effects | 28 pages, 2 figure and 1 table | The European Physical Journal C June 2019, 79:468 | 10.1140/epjc/s10052-019-6985-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As an alternative to dark matter models we use generalized Jordan-Brans-Dicke
scalar-vector-tensor (JBD-SVT) gravity model to study the behavior of the
rotational velocities of test particles moving around galaxies. To do so we
consider an interaction potential $U(\phi,N_{\mu})$ between the Brans-Dicke
scalar field $... | [
{
"created": "Mon, 3 Jun 2019 19:58:24 GMT",
"version": "v1"
}
] | 2019-06-05 | [
[
"Ghaffarnejad",
"Hossein",
""
],
[
"Dehghani",
"Razieh",
""
]
] | As an alternative to dark matter models we use generalized Jordan-Brans-Dicke scalar-vector-tensor (JBD-SVT) gravity model to study the behavior of the rotational velocities of test particles moving around galaxies. To do so we consider an interaction potential $U(\phi,N_{\mu})$ between the Brans-Dicke scalar field $\p... |
2309.17108 | Qian Li | Qian Li, Xianming Liu, Ruijun Tang, Jiayong Xiao | Anisotropic quark stars in energy-momentum squared gravity with an
interacting quark equation of state | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate anisotropic quark stars within the context of energy-momentum
squared gravity (EMSG), assuming the internal composition consists of
homogeneous, charge-neutral 3-flavor interacting quark matter with ${\cal
O}(m_s^4)$ corrections. We performed numerical calculations of the equation of
state (EoS) and th... | [
{
"created": "Fri, 29 Sep 2023 10:07:46 GMT",
"version": "v1"
}
] | 2023-10-02 | [
[
"Li",
"Qian",
""
],
[
"Liu",
"Xianming",
""
],
[
"Tang",
"Ruijun",
""
],
[
"Xiao",
"Jiayong",
""
]
] | We investigate anisotropic quark stars within the context of energy-momentum squared gravity (EMSG), assuming the internal composition consists of homogeneous, charge-neutral 3-flavor interacting quark matter with ${\cal O}(m_s^4)$ corrections. We performed numerical calculations of the equation of state (EoS) and the ... |
0904.0189 | Mubasher Jamil | Farook Rahaman, Mubasher Jamil and Kaushik Chakraborty | Revisiting the classical electron model in general relativity | 7 pages, 8 figures, to be published in Astrophys. Space Sci | Astrophys. Space Sci.331:191-197, 2011 | 10.1007/s10509-010-0446-3 | arXiv:0904.0189v4 [gr-qc] | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electron is modeled as a spherically symmetric charged perfect fluid
distribution of matter. The existing model is extended assuming a matter source
that is characterized by quadratic EoS in the context of general theory of
relativity. For the suitable choices of the parameters, our charged fluid
models almost satisf... | [
{
"created": "Wed, 1 Apr 2009 15:39:50 GMT",
"version": "v1"
},
{
"created": "Wed, 13 May 2009 16:40:14 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jul 2009 04:41:13 GMT",
"version": "v3"
},
{
"created": "Thu, 1 Jul 2010 15:45:20 GMT",
"version": "v4"
}
] | 2011-01-04 | [
[
"Rahaman",
"Farook",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Chakraborty",
"Kaushik",
""
]
] | Electron is modeled as a spherically symmetric charged perfect fluid distribution of matter. The existing model is extended assuming a matter source that is characterized by quadratic EoS in the context of general theory of relativity. For the suitable choices of the parameters, our charged fluid models almost satisfy ... |
2010.03784 | Sebastian Murk | Sebastian Murk and Daniel R. Terno | Universal properties of the near-horizon geometry | 7 pages. Published version. Comments welcome! | Phys. Rev. D 103, 064082 (2021) | 10.1103/PhysRevD.103.064082 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive universal properties of the near-horizon geometry of spherically
symmetric black holes that follow from the observability of a regular apparent
horizon. Only two types of solutions are admissible. After reviewing their
properties we show that only a special form of the solutions of the second type
is consis... | [
{
"created": "Thu, 8 Oct 2020 06:07:59 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Mar 2021 03:50:50 GMT",
"version": "v2"
}
] | 2021-04-01 | [
[
"Murk",
"Sebastian",
""
],
[
"Terno",
"Daniel R.",
""
]
] | We derive universal properties of the near-horizon geometry of spherically symmetric black holes that follow from the observability of a regular apparent horizon. Only two types of solutions are admissible. After reviewing their properties we show that only a special form of the solutions of the second type is consiste... |
gr-qc/0608016 | Masoud Alimohammadi | M. Alimohammadi and H. Mohseni Sadjadi | The w = -1 crossing of the quintom model with slowly-varying potentials | 11 pages, LaTeX, some explanations are added and some of the
calculations are transfered to the appendix, to be appeared in Phys. Letts. B | Phys.Lett.B648:113-118,2007 | 10.1016/j.physletb.2007.03.014 | null | gr-qc astro-ph hep-th | null | Considering the quintom model with arbitrary potential, it is shown that
there always exists a solution which evolves from w > -1 region to w < -1
region. The problem is restricted to the slowly varying potentials, i.e. the
slow-roll approximation. It is seen that the rate of this phase transition only
depends on the... | [
{
"created": "Thu, 3 Aug 2006 11:32:27 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Mar 2007 18:09:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alimohammadi",
"M.",
""
],
[
"Sadjadi",
"H. Mohseni",
""
]
] | Considering the quintom model with arbitrary potential, it is shown that there always exists a solution which evolves from w > -1 region to w < -1 region. The problem is restricted to the slowly varying potentials, i.e. the slow-roll approximation. It is seen that the rate of this phase transition only depends on the e... |
2111.05087 | Jan Ambjorn | J. Ambjorn and Y. Watabiki | Easing the Hubble constant tension? | 10 pages, 3 figures, v3: Comments about Coleman's mechanism added | null | 10.1142/S0217732322500419 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how a modified Friedmann equation, originating from a model of the
universe built from a certain $W_3$ algebra, has the potential to explain the
difference between the Hubble constants extracted from CMB data and from
supernova data.
| [
{
"created": "Tue, 9 Nov 2021 12:41:37 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Nov 2021 19:00:33 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Dec 2021 16:11:53 GMT",
"version": "v3"
}
] | 2022-05-11 | [
[
"Ambjorn",
"J.",
""
],
[
"Watabiki",
"Y.",
""
]
] | We show how a modified Friedmann equation, originating from a model of the universe built from a certain $W_3$ algebra, has the potential to explain the difference between the Hubble constants extracted from CMB data and from supernova data. |
2301.04697 | Jacopo Mazza | Jacopo Mazza, Stefano Liberati | Regular Black Holes and Horizonless Ultra-Compact Objects in
Lorentz-Violating Gravity | 30 pages, 5 figures. (v2) Some improvements to the exposition,
physics unchanged; matches published version | JHEP 03 (2023) 199 | 10.1007/JHEP03(2023)199 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is growing evidence that Ho\v{r}ava gravity may be a viable quantum
theory of gravity. It is thus legitimate to expect that gravitational collapse
in the full, non-projectable version of the theory should result in geometries
that are free of spacetime singularities. Previous analyses have shown that
such geome... | [
{
"created": "Wed, 11 Jan 2023 20:01:43 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jul 2023 18:14:45 GMT",
"version": "v2"
}
] | 2023-07-11 | [
[
"Mazza",
"Jacopo",
""
],
[
"Liberati",
"Stefano",
""
]
] | There is growing evidence that Ho\v{r}ava gravity may be a viable quantum theory of gravity. It is thus legitimate to expect that gravitational collapse in the full, non-projectable version of the theory should result in geometries that are free of spacetime singularities. Previous analyses have shown that such geometr... |
2208.05063 | Alkiviadis Triantafyllopoulos | E. Kapsabelis, P. G. Kevrekidis, P. C. Stavrinos and A.
Triantafyllopoulos | Schwarzschild-Finsler-Randers spacetime: Dynamical analysis, Geodesics
and Deflection Angle | 21 pages, 5 figures | Eur. Phys. J. C (2022) 82:1098 | 10.1140/epjc/s10052-022-11081-7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we extend the study of Schwarzschild-Finsler-Randers (SFR)
spacetime previously investigated by a subset of the present authors
(Triantafyllopoulos et al. in Eur Phys J C 80(12):1200, 2020; Kapsabelis et al.
in Eur Phys J C 81(11):990, 2021). We will examine the dynamical analysis of
geodesics which pro... | [
{
"created": "Tue, 9 Aug 2022 22:39:49 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Dec 2022 10:55:11 GMT",
"version": "v2"
}
] | 2022-12-27 | [
[
"Kapsabelis",
"E.",
""
],
[
"Kevrekidis",
"P. G.",
""
],
[
"Stavrinos",
"P. C.",
""
],
[
"Triantafyllopoulos",
"A.",
""
]
] | In this work, we extend the study of Schwarzschild-Finsler-Randers (SFR) spacetime previously investigated by a subset of the present authors (Triantafyllopoulos et al. in Eur Phys J C 80(12):1200, 2020; Kapsabelis et al. in Eur Phys J C 81(11):990, 2021). We will examine the dynamical analysis of geodesics which provi... |
2012.14085 | Shyam Das | Shyam Das, Koushik Chakraborty, Lipi Baskey, Saibal Ray | A study on the effect of anisotropy under Finch-Skea geometry | 26 pages, 19 figures, major revision in the text | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The popularity of the Finch-Skea ansatz to describe relativistic stellar
model have encouraged us to study the analytic solutions of the Einstein field
equation. We have presented a class of exact solutions to the field equations
after considering the corresponding two cases: (i) positive value of
anisotropic paramet... | [
{
"created": "Mon, 28 Dec 2020 03:55:02 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jul 2021 12:38:26 GMT",
"version": "v2"
}
] | 2021-07-14 | [
[
"Das",
"Shyam",
""
],
[
"Chakraborty",
"Koushik",
""
],
[
"Baskey",
"Lipi",
""
],
[
"Ray",
"Saibal",
""
]
] | The popularity of the Finch-Skea ansatz to describe relativistic stellar model have encouraged us to study the analytic solutions of the Einstein field equation. We have presented a class of exact solutions to the field equations after considering the corresponding two cases: (i) positive value of anisotropic parameter... |
2103.09486 | Metin Gurses | Metin Gurses | Nonlocal Ernst Equations | Some parts are improved and a reference is added | null | null | null | gr-qc nlin.SI | http://creativecommons.org/licenses/by/4.0/ | We show that the Ernst equations for stationary axially symmetric
Einstein-Maxwell and Einstein - N-abelian Yang-Mills field equations have local
and nonlocal reductions. Among these reduced equations the nonlocal Ernst
equations are new. We show that a class of these field equations admit
reflection symmetry without... | [
{
"created": "Wed, 17 Mar 2021 07:42:48 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2021 12:17:00 GMT",
"version": "v2"
}
] | 2021-06-22 | [
[
"Gurses",
"Metin",
""
]
] | We show that the Ernst equations for stationary axially symmetric Einstein-Maxwell and Einstein - N-abelian Yang-Mills field equations have local and nonlocal reductions. Among these reduced equations the nonlocal Ernst equations are new. We show that a class of these field equations admit reflection symmetry without r... |
gr-qc/9608002 | Piotr Koc | Piotr Koc | Evaluation of Bartnik's quasilocal mass function | 11 pages, LeTex file | null | null | null | gr-qc | null | Bartnik's definition of gravitational quasilocal energy is analyzed. For a
wide class of systems Bartnik's function is given by the ADM mass of some
vacuous extension. As an example we calculate mass of a non central ball in
Schwarzschild geometry. The ratio mass to volume becomes singular in the limit
of small volum... | [
{
"created": "Thu, 1 Aug 1996 20:49:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Koc",
"Piotr",
""
]
] | Bartnik's definition of gravitational quasilocal energy is analyzed. For a wide class of systems Bartnik's function is given by the ADM mass of some vacuous extension. As an example we calculate mass of a non central ball in Schwarzschild geometry. The ratio mass to volume becomes singular in the limit of small volumes... |
gr-qc/9605013 | Ilja Schmelzer | Ilja Schmelzer (WIAS Berlin) | Post-Relativistic Gravity - A Hidden Variable Theory For General
Relativity | 9 pages. See http://www.c2.org/~ilja/PG/ for details | null | null | null | gr-qc | null | Post-relativistic gravity is a hidden variable theory for general relativity.
It introduces the pre-relativistic notions absolute space, absolute time, and
ether as hidden variables into general relativity. Evolution is defined by the
equations of general relativity and the harmonic coordinate condition
interpreted a... | [
{
"created": "Wed, 8 May 1996 12:32:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmelzer",
"Ilja",
"",
"WIAS Berlin"
]
] | Post-relativistic gravity is a hidden variable theory for general relativity. It introduces the pre-relativistic notions absolute space, absolute time, and ether as hidden variables into general relativity. Evolution is defined by the equations of general relativity and the harmonic coordinate condition interpreted as ... |
1011.5911 | Matt Visser | Carlos Barcelo (IAA-CSIC, Granada), Stefano Liberati (SISSA, Trieste),
Sebastiano Sonego (Universita di Udine), Matt Visser (Victoria University of
Wellington) | Hawking-like radiation from evolving black holes and compact horizonless
objects | V1: 34 pages. V2: 35 pages; several additional references added; this
version accepted for publication in JHEP | JHEP 1102:003,2011 | 10.1007/JHEP02(2011)003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Usually, Hawking radiation is derived assuming (i) that a future eternal
event horizon forms, and (ii) that the subsequent exterior geometry is static.
However, one may be interested in either considering quasi-black holes (objects
in an ever-lasting state of approach to horizon formation, but never quite
forming one... | [
{
"created": "Fri, 26 Nov 2010 21:00:10 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jan 2011 19:22:55 GMT",
"version": "v2"
}
] | 2011-02-16 | [
[
"Barcelo",
"Carlos",
"",
"IAA-CSIC, Granada"
],
[
"Liberati",
"Stefano",
"",
"SISSA, Trieste"
],
[
"Sonego",
"Sebastiano",
"",
"Universita di Udine"
],
[
"Visser",
"Matt",
"",
"Victoria University of\n Wellington"
]
] | Usually, Hawking radiation is derived assuming (i) that a future eternal event horizon forms, and (ii) that the subsequent exterior geometry is static. However, one may be interested in either considering quasi-black holes (objects in an ever-lasting state of approach to horizon formation, but never quite forming one),... |
1904.12167 | Martin Reiris | Mart\'in Reiris, Javier Peraza | A complete classification of S1-symmetric static vacuum black holes | 17 pgs, 3 figures | null | 10.1088/1361-6382/ab497c | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a seminal paper of 1917, H. Weyl presented a remarkable reduction of the
static axisymmetric vacuum Einstein equations, serving as a relatively
straightforward technique to generate and explore new solutions. Weyl's
reduction was used by Myers in 1987, and independently by Korotkin-Nicolai in
1994, to construct a ... | [
{
"created": "Sat, 27 Apr 2019 15:35:17 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Reiris",
"Martín",
""
],
[
"Peraza",
"Javier",
""
]
] | In a seminal paper of 1917, H. Weyl presented a remarkable reduction of the static axisymmetric vacuum Einstein equations, serving as a relatively straightforward technique to generate and explore new solutions. Weyl's reduction was used by Myers in 1987, and independently by Korotkin-Nicolai in 1994, to construct a ne... |
2404.09858 | Sjors Heefer | Sjors Heefer | Finsler Geometry, Spacetime & Gravity -- From Metrizability of Berwald
Spaces to Exact Vacuum Solutions in Finsler Gravity | PhD thesis. ISBN: 978-90-386-6026-4 | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This PhD dissertation covers a range of topics in Finsler geometry and
Finsler gravity, most notably: (i) the characterization of Berwald spaces, (ii)
pseudo-Riemann (non-)metrizability of Berwald spaces, (iii)
$(\alpha,\beta)$-metrics, (iv) exact solutions to Pfeifer and Wohlfarth's
vacuum field equation in Finsler ... | [
{
"created": "Mon, 15 Apr 2024 15:14:00 GMT",
"version": "v1"
}
] | 2024-04-16 | [
[
"Heefer",
"Sjors",
""
]
] | This PhD dissertation covers a range of topics in Finsler geometry and Finsler gravity, most notably: (i) the characterization of Berwald spaces, (ii) pseudo-Riemann (non-)metrizability of Berwald spaces, (iii) $(\alpha,\beta)$-metrics, (iv) exact solutions to Pfeifer and Wohlfarth's vacuum field equation in Finsler gr... |
1404.4627 | Hong-Jian He | Jing Ren, Zhong-Zhi Xianyu, Hong-Jian He | Higgs Gravitational Interaction, Weak Boson Scattering, and Higgs
Inflation in Jordan and Einstein Frames | 40pp, JCAP Final Version. Use jcappub.sty, only minor rewordings,
references added | JCAP 06 (2014) 032 | 10.1088/1475-7516/2014/06/032 | KCL-PH-TH/2014-25 | gr-qc astro-ph.CO hep-ex hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational interaction of Higgs boson through the unique
dimension-4 operator $\xi H^\dag H R$, with $H$ the Higgs doublet and $R$ the
Ricci scalar curvature. We analyze the effect of this dimensionless nonminimal
coupling $\xi$ on weak gauge boson scattering in both Jordan and Einstein
frames. We explici... | [
{
"created": "Thu, 17 Apr 2014 19:53:31 GMT",
"version": "v1"
},
{
"created": "Fri, 16 May 2014 17:41:12 GMT",
"version": "v2"
}
] | 2014-06-16 | [
[
"Ren",
"Jing",
""
],
[
"Xianyu",
"Zhong-Zhi",
""
],
[
"He",
"Hong-Jian",
""
]
] | We study gravitational interaction of Higgs boson through the unique dimension-4 operator $\xi H^\dag H R$, with $H$ the Higgs doublet and $R$ the Ricci scalar curvature. We analyze the effect of this dimensionless nonminimal coupling $\xi$ on weak gauge boson scattering in both Jordan and Einstein frames. We explicitl... |
1904.06516 | Boris Latosh | A.B. Arbuzov and B.N. Latosh | Gravity and Nonlinear Symmetry Realisation | Minor corrections | Universe 2020, 6(1), 12 | 10.3390/universe6010012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Application of nonlinear symmetry realisation technique to gravity is
studied. We identify the simplest extensions of the Poincare group suitable for
nonlinear realisation. Among them only one model is suitable for description of
massless spin-2 states. This model, unlike general relativity, describes states
with wel... | [
{
"created": "Sat, 13 Apr 2019 10:10:05 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 2019 10:17:41 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Jan 2020 16:34:14 GMT",
"version": "v3"
}
] | 2020-01-16 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Latosh",
"B. N.",
""
]
] | Application of nonlinear symmetry realisation technique to gravity is studied. We identify the simplest extensions of the Poincare group suitable for nonlinear realisation. Among them only one model is suitable for description of massless spin-2 states. This model, unlike general relativity, describes states with well-... |
0706.1455 | Francesc Fayos | F. Fayos, Ch. Teijon-Lumbreras | Geometrical locus of massive test particle orbits in the space of
physical parameters in Kerr space-time | 26 pages, 12 figures | Gen.Rel.Grav.40:2433-2460,2008 | 10.1007/s10714-008-0629-1 | null | gr-qc | null | Gravitational radiation of binary systems can be studied by using the
adiabatic approximation in General Relativity. In this approach a small
astrophysical object follows a trajectory consisting of a chained series of
bounded geodesics (orbits) in the outer region of a Kerr Black Hole,
representing the space time cre... | [
{
"created": "Mon, 11 Jun 2007 12:20:53 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fayos",
"F.",
""
],
[
"Teijon-Lumbreras",
"Ch.",
""
]
] | Gravitational radiation of binary systems can be studied by using the adiabatic approximation in General Relativity. In this approach a small astrophysical object follows a trajectory consisting of a chained series of bounded geodesics (orbits) in the outer region of a Kerr Black Hole, representing the space time creat... |
1706.07736 | Iva Stavrov | Noah Benjamin, Iva Stavrov Allen | The Effects of Self-Interaction on Constructing Relativistic Point
Particles | 6 figures | null | 10.1007/s10714-017-2324-6 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a framework for studying the effects of self-interaction on the
construction of point particle initial data in General Relativity. Within this
framework we rigorously prove the vanishing mass claim made by Arnowitt, Deser
and Misner regarding point sources. We identify a geometric structure and a
scaling... | [
{
"created": "Fri, 23 Jun 2017 14:56:52 GMT",
"version": "v1"
}
] | 2017-12-20 | [
[
"Benjamin",
"Noah",
""
],
[
"Allen",
"Iva Stavrov",
""
]
] | We introduce a framework for studying the effects of self-interaction on the construction of point particle initial data in General Relativity. Within this framework we rigorously prove the vanishing mass claim made by Arnowitt, Deser and Misner regarding point sources. We identify a geometric structure and a scaling p... |
gr-qc/9507030 | Dadhich | L.K. Patel and Naresh Dadhich | A Class of Stationary Rotating String Cosmological Models | 7 pages, TeX version | Pramana 47 (1996) 387-392 | 10.1007/BF02847825 | IUCAA-18/95 | gr-qc | null | We obtain a one parameter class of stationary rotating string cosmological
models of which the well-known G$\ddot o $del Universe is a particular case. By
suitably choosing the free parameter function, it is always possible to satisfy
the energy conditions. The rotation of the model hinges on the cosmological
constan... | [
{
"created": "Fri, 14 Jul 1995 14:53:47 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Patel",
"L. K.",
""
],
[
"Dadhich",
"Naresh",
""
]
] | We obtain a one parameter class of stationary rotating string cosmological models of which the well-known G$\ddot o $del Universe is a particular case. By suitably choosing the free parameter function, it is always possible to satisfy the energy conditions. The rotation of the model hinges on the cosmological constant ... |
1703.00142 | Bibhas Majhi Ranjan | Bibhas Ranjan Majhi, Saurav Samanta | Entropy corresponding to the interior of a Schwarzschild black hole | Two new references and additional discussions added, to appear in
Phys. Lett. B | Phys.Lett. B770 (2017) 314-318 | 10.1016/j.physletb.2017.05.003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Interior volume within the horizon of a black hole is a non-trivial concept
which turns out to be very important to explain several issues in the context
of quantum nature of black hole. Here we show that the entropy, contained by
the {\it maximum} interior volume for massless modes, is proportional to the
Bekenstein... | [
{
"created": "Wed, 1 Mar 2017 05:31:18 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2017 06:26:23 GMT",
"version": "v2"
}
] | 2017-05-31 | [
[
"Majhi",
"Bibhas Ranjan",
""
],
[
"Samanta",
"Saurav",
""
]
] | Interior volume within the horizon of a black hole is a non-trivial concept which turns out to be very important to explain several issues in the context of quantum nature of black hole. Here we show that the entropy, contained by the {\it maximum} interior volume for massless modes, is proportional to the Bekenstein-H... |
1605.08316 | James Quach Dr | James Q. Quach | Spin gravitational resonance and graviton detection | 6 pages, 1 figure | Phys. Rev. D 93, 104048 (2016) | 10.1103/PhysRevD.93.104048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a gravitational analogue of spin magnetic resonance, called spin
gravitational resonance, whereby a gravitational wave interacts with a magnetic
field to produce a spin transition. In particular, an external magnetic field
separates the energy spin states of a spin-1/2 particle, and the presence of
the gra... | [
{
"created": "Thu, 26 May 2016 15:00:51 GMT",
"version": "v1"
}
] | 2016-05-27 | [
[
"Quach",
"James Q.",
""
]
] | We develop a gravitational analogue of spin magnetic resonance, called spin gravitational resonance, whereby a gravitational wave interacts with a magnetic field to produce a spin transition. In particular, an external magnetic field separates the energy spin states of a spin-1/2 particle, and the presence of the gravi... |
2007.13150 | Sandeep Aashish | Sandeep Aashish | Covariant Quantum Gravitational Corrections to Scalar and Tensor Field
Models | 130 pages, 2 figures; PhD thesis (Indian Institute of Science
Education and Research Bhopal, April 2020) based on previously published
works in arxiv:1803.10157, arxiv:1806.08194, arxiv:1903.11364,
arxiv:1905.12249 and arxiv:2001.07350 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent and upcoming experimental data as well as the possibility of rich
phenomenology have spiked interest in studying the quantum effects in cosmology
at low (inflation-era) energy scales. One of the approaches to find covariant
quantum corrections is the DeWitt-Vilkovisky's (DV) covariant effective action
formalis... | [
{
"created": "Sun, 26 Jul 2020 15:36:03 GMT",
"version": "v1"
}
] | 2020-07-28 | [
[
"Aashish",
"Sandeep",
""
]
] | Recent and upcoming experimental data as well as the possibility of rich phenomenology have spiked interest in studying the quantum effects in cosmology at low (inflation-era) energy scales. One of the approaches to find covariant quantum corrections is the DeWitt-Vilkovisky's (DV) covariant effective action formalism ... |
1207.6142 | Milton Ruiz | Milton Ruiz, Juan Carlos Degollado, Miguel Alcubierre, Dario Nunez,
Marcelo Salgado | Induced scalarization in boson stars and scalar gravitational radiation | 18 pages, 11 figures. Minor changes to match the published version | Phys. Rev. D 86 104044, 2012 | 10.1103/PhysRevD.86.104044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamical evolution of boson stars in scalar-tensor theories of gravity
is considered in the physical (Jordan) frame. We focus on the study of
spontaneous and induced scalarization, for which we take as initial data
configurations on the well-known S-branch of a single boson star in general
relativity. We show th... | [
{
"created": "Wed, 25 Jul 2012 23:12:02 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2012 09:34:10 GMT",
"version": "v2"
}
] | 2012-11-22 | [
[
"Ruiz",
"Milton",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Alcubierre",
"Miguel",
""
],
[
"Nunez",
"Dario",
""
],
[
"Salgado",
"Marcelo",
""
]
] | The dynamical evolution of boson stars in scalar-tensor theories of gravity is considered in the physical (Jordan) frame. We focus on the study of spontaneous and induced scalarization, for which we take as initial data configurations on the well-known S-branch of a single boson star in general relativity. We show that... |
gr-qc/0702130 | Samad Khakshournia | S. Khakshournia and R. Mansouri | Matching LTB and FRW spacetimes through a null hypersurface | 9 pages | Grav.Cosmol.14:295-300,2008 | 10.1134/S0202289308040014 | null | gr-qc astro-ph | null | Matching of a LTB metric representing dust matter to a background FRW
universe across a null hypersurface is studied. In general, an unrestricted
matching is possible only if the background FRW is flat or open. There is in
general no gravitational impulsive wave present on the null hypersurface which
is shear-free an... | [
{
"created": "Sat, 24 Feb 2007 08:44:22 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Khakshournia",
"S.",
""
],
[
"Mansouri",
"R.",
""
]
] | Matching of a LTB metric representing dust matter to a background FRW universe across a null hypersurface is studied. In general, an unrestricted matching is possible only if the background FRW is flat or open. There is in general no gravitational impulsive wave present on the null hypersurface which is shear-free and ... |
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