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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1402.4355 | Rituparno Goswami | Aymen I. M. Hamid, Rituparno Goswami and Sunil D. Maharaj | Cosmic Censorship Conjecture revisited: Covariantly | Minor changes in the text, the version matches the published version | Class. Quant. Grav. 31 (2014) 135010 | 10.1088/0264-9381/31/13/135010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the dynamics of the trapped region using a frame
independent semi-tetrad covariant formalism for general Locally Rotationally
Symmetric (LRS) class II spacetimes. We covariantly prove some important
geometrical results for the apparent horizon, and state the necessary and
sufficient conditions ... | [
{
"created": "Tue, 18 Feb 2014 14:37:09 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jul 2014 07:46:49 GMT",
"version": "v2"
}
] | 2014-07-31 | [
[
"Hamid",
"Aymen I. M.",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | In this paper we study the dynamics of the trapped region using a frame independent semi-tetrad covariant formalism for general Locally Rotationally Symmetric (LRS) class II spacetimes. We covariantly prove some important geometrical results for the apparent horizon, and state the necessary and sufficient conditions fo... |
2204.11096 | Daniela Pugliese Dr | D. Pugliese and H. Quevedo | On light surfaces in black hole thermodynamics | 23 double column pages, 12 multipanels figures, 1Table, To appear in
EPJC | null | 10.1140/epjc/s10052-022-10370-5 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We discuss the fundamentals of classical black hole (BH) thermodynamics in a
new framework determined by light surfaces and their frequencies. This new
approach allows us to study BH transitions inside the Kerr geometry. In the
case of BHs, we introduce a new parametrization of the metric in terms of the
maximum extr... | [
{
"created": "Sat, 23 Apr 2022 15:57:24 GMT",
"version": "v1"
}
] | 2022-06-01 | [
[
"Pugliese",
"D.",
""
],
[
"Quevedo",
"H.",
""
]
] | We discuss the fundamentals of classical black hole (BH) thermodynamics in a new framework determined by light surfaces and their frequencies. This new approach allows us to study BH transitions inside the Kerr geometry. In the case of BHs, we introduce a new parametrization of the metric in terms of the maximum extrac... |
1311.2057 | Salvatore Vitale | Salvatore Vitale and Walter Del Pozzo | How serious can the stealth bias be in gravitational wave parameter
estimation? | 10 pages, 9 figures, 5 tables | Phys. Rev. D 89 (2014) 022002 | 10.1103/PhysRevD.89.022002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The upcoming direct detection of gravitational waves will open a window to
probing the strong-field regime of general relativity (GR). As a consequence,
waveforms that include the presence of deviations from GR have been developed
(e.g. in the parametrized post-Einsteinian approach). TIGER, a data analysis
pipeline w... | [
{
"created": "Fri, 8 Nov 2013 20:16:56 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Vitale",
"Salvatore",
""
],
[
"Del Pozzo",
"Walter",
""
]
] | The upcoming direct detection of gravitational waves will open a window to probing the strong-field regime of general relativity (GR). As a consequence, waveforms that include the presence of deviations from GR have been developed (e.g. in the parametrized post-Einsteinian approach). TIGER, a data analysis pipeline whi... |
2009.05640 | Leandros Perivolaropoulos | L. Perivolaropoulos and F. Skara | Scalar tachyonic instabilities in gravitational backgrounds: Existence
and growth rate | 19 pages, 10 figures. References added, typos corrected. The
Mathematica numerical file that lead to the production of the figures may be
downloaded from http://leandros.physics.uoi.gr/tachyonic-instabilities.zip | null | 10.1103/PhysRevD.102.104034 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the Klein Gordon (KG) equation $\Box \Phi + m^2\Phi=0$
has tachyonic unstable modes on large scales ($k^2<\vert m \vert^2$) for
$m^2<m_{cr}^2=0$ in a flat Minkowski spacetime with maximum growth rate
$\Omega_{F}(m)= \vert m \vert$ achieved at $k=0$. We investigate these
instabilities in a Reissn... | [
{
"created": "Fri, 11 Sep 2020 19:50:14 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Sep 2020 09:49:34 GMT",
"version": "v2"
}
] | 2020-12-09 | [
[
"Perivolaropoulos",
"L.",
""
],
[
"Skara",
"F.",
""
]
] | It is well known that the Klein Gordon (KG) equation $\Box \Phi + m^2\Phi=0$ has tachyonic unstable modes on large scales ($k^2<\vert m \vert^2$) for $m^2<m_{cr}^2=0$ in a flat Minkowski spacetime with maximum growth rate $\Omega_{F}(m)= \vert m \vert$ achieved at $k=0$. We investigate these instabilities in a Reissner... |
2203.02908 | Minyong Guo | Zezhou Hu, Yehui Hou, Haopeng Yan, Minyong Guo and Bin Chen | Polarized Images of Synchrotron Radiations in Curved Spacetime | 25 pages, 6 figures, accepted in EPJC | null | 10.1140/epjc/s10052-022-11144-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we derive two formulas encoding the polarization direction and
luminosity of synchrotron radiations from the moving electrons in curved
spacetime under the geometric optics approximation. As an application, we
further study the polarized images of synchrotron radiations from electron
sources in Schwarzs... | [
{
"created": "Sun, 6 Mar 2022 09:00:17 GMT",
"version": "v1"
},
{
"created": "Sun, 22 May 2022 06:42:13 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Dec 2022 04:23:48 GMT",
"version": "v3"
}
] | 2023-01-18 | [
[
"Hu",
"Zezhou",
""
],
[
"Hou",
"Yehui",
""
],
[
"Yan",
"Haopeng",
""
],
[
"Guo",
"Minyong",
""
],
[
"Chen",
"Bin",
""
]
] | In this work, we derive two formulas encoding the polarization direction and luminosity of synchrotron radiations from the moving electrons in curved spacetime under the geometric optics approximation. As an application, we further study the polarized images of synchrotron radiations from electron sources in Schwarzsch... |
2406.01241 | Amarkumar Agrawal | A. S. Agrawal, Sergio Zerbini and B. Mishra | Black Holes and Wormholes Beyond Classical General Relativity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper, only Static Spherically Symmetric space-times in four
dimensions are considered within modified gravity models. The non-singular
static metrics, including black holes not admitting a de Sitter core in the
center and traversable wormholes, are reconsidered within a class of
higher-order $F(R)$, satisfyin... | [
{
"created": "Mon, 3 Jun 2024 11:59:51 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"Agrawal",
"A. S.",
""
],
[
"Zerbini",
"Sergio",
""
],
[
"Mishra",
"B.",
""
]
] | In the paper, only Static Spherically Symmetric space-times in four dimensions are considered within modified gravity models. The non-singular static metrics, including black holes not admitting a de Sitter core in the center and traversable wormholes, are reconsidered within a class of higher-order $F(R)$, satisfying ... |
1504.02768 | Yurii Ignat'ev | Yu.G. Ignat'ev | Nonminimal Macroscopic Models of a Scalar Field Based on Microscopic
Dynamics. I. Extension of the Theory for Negative Masses | 13 pages | null | 10.1134/S0202289315040076 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The article proposes generalizations of the macroscopic model of plasma of
scalar charged particles to the cases of inter-particle interaction with
multiple scalar fields and negative effective masses of these particles. The
model is based on the microscopic dynamics of a particle at presence of scalar
fields. The th... | [
{
"created": "Fri, 10 Apr 2015 19:47:04 GMT",
"version": "v1"
}
] | 2015-12-02 | [
[
"Ignat'ev",
"Yu. G.",
""
]
] | The article proposes generalizations of the macroscopic model of plasma of scalar charged particles to the cases of inter-particle interaction with multiple scalar fields and negative effective masses of these particles. The model is based on the microscopic dynamics of a particle at presence of scalar fields. The theo... |
1807.05011 | Angnis Schmidt-May | Brage Gording and Angnis Schmidt-May | Ghost-free infinite derivative gravity | 12 pages, coefficient u3 in eq (3.21) corrected | null | 10.1007/JHEP09(2018)044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the construction of a gravitational action including an infinite
series of higher derivative terms. The outcome is a classically consistent
completion of a well-studied quadratic curvature theory. The closed form for
the full action is ghost-free bimetric theory, describing the interactions of a
massive an... | [
{
"created": "Fri, 13 Jul 2018 11:18:13 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2018 15:19:01 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Sep 2018 07:07:42 GMT",
"version": "v3"
},
{
"created": "Thu, 11 Oct 2018 11:23:50 GMT",
"version": "v4"
}
] | 2018-10-12 | [
[
"Gording",
"Brage",
""
],
[
"Schmidt-May",
"Angnis",
""
]
] | We present the construction of a gravitational action including an infinite series of higher derivative terms. The outcome is a classically consistent completion of a well-studied quadratic curvature theory. The closed form for the full action is ghost-free bimetric theory, describing the interactions of a massive and ... |
1211.2631 | Sijie Gao | Sijie Gao, Yuan Zhang | Destroying extremal Kerr-Newman black holes with test particles | 9 pages, 2 figure | Phys. Rev. D 87, 044028 (2013) | 10.1103/PhysRevD.87.044028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that a nearly extremal black hole can be overcharged or
overspun by a test particle if radiative and self-force effects are neglected,
indicating that the cosmic censorship might fail. In contrast, the existing
evidence in literature suggests that an extremal black hole cannot be
overcharged or over... | [
{
"created": "Mon, 12 Nov 2012 14:27:35 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Feb 2013 13:17:02 GMT",
"version": "v2"
}
] | 2013-02-26 | [
[
"Gao",
"Sijie",
""
],
[
"Zhang",
"Yuan",
""
]
] | It has been shown that a nearly extremal black hole can be overcharged or overspun by a test particle if radiative and self-force effects are neglected, indicating that the cosmic censorship might fail. In contrast, the existing evidence in literature suggests that an extremal black hole cannot be overcharged or oversp... |
gr-qc/0112076 | Manasse R. Mbonye | Manasse R. Mbonye | Are spacetime horizons higher dimensional sources of energy fields? (The
black hole case) | 11 pages, latex. Eq. 2 modified, consistent with results in Eq. 9;
minor typo changes | null | null | null | gr-qc astro-ph hep-th | null | We explore the possibility that spacetime horizons in 4D general relativity
can be treated as manifestations of higher dimensions that induce fields on our
4D spacetime. In this paper we discuss the black hole event horizon, as an
example (we leave the cosmological case for future discussion). Starting off
from the f... | [
{
"created": "Fri, 28 Dec 2001 20:40:48 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Dec 2001 06:45:16 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Jan 2002 18:37:41 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Mbonye",
"Manasse R.",
""
]
] | We explore the possibility that spacetime horizons in 4D general relativity can be treated as manifestations of higher dimensions that induce fields on our 4D spacetime. In this paper we discuss the black hole event horizon, as an example (we leave the cosmological case for future discussion). Starting off from the fie... |
1808.09163 | Kourosh Nozari | Sara Saghafi and Kourosh Nozari | Black hole thermodynamics in Snyder phase space | 12 pages, 3 figures, selected as featured articles: best of 2017
papers | International Journal of Geometric Methods in Modern Physics, Vol.
14 (2017) 1750164 | 10.1142/S021988781750164X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By defining a noncommutative symplectic structure, we study thermodynamics of
Schwarzschild black hole in a Snyder noncommutative phase space for the first
time. Since natural cutoffs are the results of compactness of symplectic
manifolds in phase space, the physics of black holes in such a space would be
affected ma... | [
{
"created": "Tue, 28 Aug 2018 08:12:44 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Saghafi",
"Sara",
""
],
[
"Nozari",
"Kourosh",
""
]
] | By defining a noncommutative symplectic structure, we study thermodynamics of Schwarzschild black hole in a Snyder noncommutative phase space for the first time. Since natural cutoffs are the results of compactness of symplectic manifolds in phase space, the physics of black holes in such a space would be affected main... |
0808.2100 | Sunil Maharaj | S. S. Misthry, S. D. Maharaj, P. G. L. Leach | Nonlinear Shear-free Radiative Collapse | 13 pages, To appear in Math. Meth. Appl. Sci | Math.MethodsAppl.Sci.31:363-374,2008 | 10.1002/mma.917 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study realistic models of relativistic radiating stars undergoing
gravitational collapse which have vanishing Weyl tensor components. Previous
investigations are generalised by retaining the inherent nonlinearity at the
boundary. We transform the boundary condition to an Abel equation of the first
kind. A variety ... | [
{
"created": "Fri, 15 Aug 2008 06:37:44 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Misthry",
"S. S.",
""
],
[
"Maharaj",
"S. D.",
""
],
[
"Leach",
"P. G. L.",
""
]
] | We study realistic models of relativistic radiating stars undergoing gravitational collapse which have vanishing Weyl tensor components. Previous investigations are generalised by retaining the inherent nonlinearity at the boundary. We transform the boundary condition to an Abel equation of the first kind. A variety of... |
2107.03294 | Loic Rolland | Virgo Collaboration: F. Acernese, M. Agathos, A. Ain, S. Albanesi, A.
Allocca, A. Amato, T. Andrade, N. Andres, T. Andri\'c, S. Ansoldi, S. Antier,
M. Ar\`ene, N. Arnaud, M. Assiduo, P. Astone, F. Aubin, S. Babak, F.
Badaracco, M. K. M. Bader, S. Bagnasco, J. Baird, G. Ballardin, G. Baltus, C.
Barbieri, P. Barn... | Calibration of Advanced Virgo and reconstruction of detector strain h(t)
during the Observing Run O3 | 50 pages, 30 figures. Submitted to Class. and Quantum Grav.. Includes
revision after referee's comments (resubmitted Nov. 2021) | Class. Quantum Grav. 39 045006 (2022) | 10.1088/1361-6382/ac3c8e | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | The three Advanced Virgo and LIGO gravitational wave detectors participated
to the third observing run (O3) between 1 April 2019 15:00 UTC and 27 March
2020 17:00 UTC,leading to several gravitational wave detections per month. This
paper describes the Advanced Virgo detector calibration and the reconstruction
of the ... | [
{
"created": "Wed, 7 Jul 2021 15:29:29 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Oct 2021 12:41:01 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Nov 2021 17:33:20 GMT",
"version": "v3"
}
] | 2022-03-11 | [
[
"Virgo Collaboration",
"",
""
],
[
"Acernese",
"F.",
""
],
[
"Agathos",
"M.",
""
],
[
"Ain",
"A.",
""
],
[
"Albanesi",
"S.",
""
],
[
"Allocca",
"A.",
""
],
[
"Amato",
"A.",
""
],
[
"Andrade",
"T... | The three Advanced Virgo and LIGO gravitational wave detectors participated to the third observing run (O3) between 1 April 2019 15:00 UTC and 27 March 2020 17:00 UTC,leading to several gravitational wave detections per month. This paper describes the Advanced Virgo detector calibration and the reconstruction of the de... |
2108.06077 | Shibesh Kumar Jas Pacif | Ritika Nagpal, Shibesh Kumar Jas Pacif | Cosmological aspects of $f(R,T)$ gravity in a simple model with a
parametrization of $q$ | 14 pages, 3 figures with sub-figures | European Physical Journal Plus 136, 875 (2021) | 10.1140/epjp/s13360-021-01877-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have considered a quadratic variation of the deceleration
parameter ($q$) as a function of cosmic time ($t$) which describes a smooth
transition from the decelerating phase of the Universe to an accelerating one
and also show some distinctive feature from the standard model. The logical
move of this... | [
{
"created": "Fri, 13 Aug 2021 06:13:41 GMT",
"version": "v1"
}
] | 2022-06-30 | [
[
"Nagpal",
"Ritika",
""
],
[
"Pacif",
"Shibesh Kumar Jas",
""
]
] | In this paper, we have considered a quadratic variation of the deceleration parameter ($q$) as a function of cosmic time ($t$) which describes a smooth transition from the decelerating phase of the Universe to an accelerating one and also show some distinctive feature from the standard model. The logical move of this a... |
gr-qc/9804026 | J. Alberto Lobo | J Alberto Lobo and Miquel Montero | All-sky search algorithms for monochromatic signals in resonant bar GW
detector data | 17 pages, 10 PS figures, psbox, MNRAS TeX, submitted to MNRAS,
revised 22-june-1998, full quality figures available compressed at
ftp://fismat.ffn.ub.es/pub/papers/gr-qc/fig_9804026.zip | Mon.Not.Roy.Astron.Soc.301:729-744,1998 | 10.1046/j.1365-8711.1998.02016.x | null | gr-qc | null | In this paper we design and develop several filtering strategies for the
analysis of data generated by a resonant bar Gravitational Wave (GW) antenna,
with the goal to assess the presence (or absence) in them of long duration
monochromatic GW signals, as well as their eventual amplitude and frequency,
within the sens... | [
{
"created": "Wed, 8 Apr 1998 18:48:08 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jun 1998 07:22:22 GMT",
"version": "v2"
}
] | 2011-05-23 | [
[
"Lobo",
"J Alberto",
""
],
[
"Montero",
"Miquel",
""
]
] | In this paper we design and develop several filtering strategies for the analysis of data generated by a resonant bar Gravitational Wave (GW) antenna, with the goal to assess the presence (or absence) in them of long duration monochromatic GW signals, as well as their eventual amplitude and frequency, within the sensit... |
2006.10889 | Mart\'in G. Richarte MR | Gilberto M. Kremer, Mart\'in G. Richarte, and Elberth M. Schiefer | Using kinetic theory to examine a self-gravitating system composed of
baryons and cold dark matter | 11 pages, 4 figures | Eur. Phys. J. C (2019) 79: 492 | 10.1140/epjc/s10052-019-6965-3 | null | gr-qc astro-ph.CO astro-ph.GA | http://creativecommons.org/publicdomain/zero/1.0/ | We examine the evolution of non-relativistic cold dark matter gravitationally
coupled to baryons with modes deep inside the Hubble radius (sub-horizon
regime) using akinetic theory approach within the realm of Newtonian theory. We
obtain the general solution for the total density perturbation and we also show
that a ... | [
{
"created": "Thu, 18 Jun 2020 22:57:03 GMT",
"version": "v1"
}
] | 2020-06-22 | [
[
"Kremer",
"Gilberto M.",
""
],
[
"Richarte",
"Martín G.",
""
],
[
"Schiefer",
"Elberth M.",
""
]
] | We examine the evolution of non-relativistic cold dark matter gravitationally coupled to baryons with modes deep inside the Hubble radius (sub-horizon regime) using akinetic theory approach within the realm of Newtonian theory. We obtain the general solution for the total density perturbation and we also show that a ba... |
2202.01983 | Muhammad Sharif | M. Sharif, Amal Majid and M. Shafaqat | Study of Anisotropic Polytropes in $f(\mathcal{R},\mathrm{T})$ Theory | 39 pages, 21 figures, to appear in Physica Scripta | Physica Scripta 97(2022)035001 | 10.1088/1402-4896/ac4f05 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper examines the general formalism and applications of isotropic as
well as anisotropic polytropic stars in curvature-matter coupled gravity. For
this purpose, we consider static spherical and Schwarzschild spacetimes in the
interior and exterior regions, respectively. We use two polytropic equations of
state ... | [
{
"created": "Tue, 1 Feb 2022 05:26:25 GMT",
"version": "v1"
}
] | 2022-02-16 | [
[
"Sharif",
"M.",
""
],
[
"Majid",
"Amal",
""
],
[
"Shafaqat",
"M.",
""
]
] | This paper examines the general formalism and applications of isotropic as well as anisotropic polytropic stars in curvature-matter coupled gravity. For this purpose, we consider static spherical and Schwarzschild spacetimes in the interior and exterior regions, respectively. We use two polytropic equations of state to... |
gr-qc/0609104 | Luis P. Chimento | Luis P. Chimento and Winfried Zimdahl | Duality invariance and cosmological dynamics | 14 pages, Discussion enlarged, accepted for publication in IJMPD | Int.J.Mod.Phys.D17:2229-2254,2008 | 10.1142/S0218271808013820 | null | gr-qc astro-ph hep-th | null | A duality transformation that interrelates expanding and contracting
cosmological models is shown to single out a duality invariant, interacting
two-component description of any irrotational, geodesic and shearfree cosmic
medium with vanishing three curvature scalar. We apply this feature to a system
of matter and ra... | [
{
"created": "Sat, 23 Sep 2006 00:40:43 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2007 13:30:09 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Feb 2008 09:37:00 GMT",
"version": "v3"
}
] | 2009-02-11 | [
[
"Chimento",
"Luis P.",
""
],
[
"Zimdahl",
"Winfried",
""
]
] | A duality transformation that interrelates expanding and contracting cosmological models is shown to single out a duality invariant, interacting two-component description of any irrotational, geodesic and shearfree cosmic medium with vanishing three curvature scalar. We apply this feature to a system of matter and radi... |
2310.04195 | Andronikos Paliathanasis | Andronikos Paliathanasis | Nonzero Spatial Curvature in Symmetric Teleparallel Cosmology | 23 pages, 3 figures, to appear in Physics of the Dark Universe | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the symmetric teleparallel $f\left( Q\right) $-gravity in
Friedmann--Lema\^{\i}tre--Robertson--Walker cosmology with nonzero spatial
curvature. For a nonlinear $f\left( Q\right) $ model there exist always the
limit of General\ Relativity with or without the cosmological constant term.
The de Sitter soluti... | [
{
"created": "Fri, 6 Oct 2023 12:21:16 GMT",
"version": "v1"
}
] | 2023-10-09 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We consider the symmetric teleparallel $f\left( Q\right) $-gravity in Friedmann--Lema\^{\i}tre--Robertson--Walker cosmology with nonzero spatial curvature. For a nonlinear $f\left( Q\right) $ model there exist always the limit of General\ Relativity with or without the cosmological constant term. The de Sitter solution... |
1706.07784 | Dong-Han Yeom | Pisin Chen, Dong-han Yeom | Why concave rather than convex inflaton potential? | 9 pages, 3 figures | Eur.Phys.J. C78 (2018) no.10, 863 | 10.1140/epjc/s10052-018-6357-0 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Planck data on cosmic microwave background indicates that the
Starobinsky-type model with concave inflation potential is favored over the
convex-type chaotic inflation. Is there any reason for that? Here we argue that
if our universe began with a Euclidean wormhole, then the Starobinsky-type
inflation is probabil... | [
{
"created": "Fri, 23 Jun 2017 17:32:27 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2018 01:59:53 GMT",
"version": "v2"
}
] | 2018-11-06 | [
[
"Chen",
"Pisin",
""
],
[
"Yeom",
"Dong-han",
""
]
] | The Planck data on cosmic microwave background indicates that the Starobinsky-type model with concave inflation potential is favored over the convex-type chaotic inflation. Is there any reason for that? Here we argue that if our universe began with a Euclidean wormhole, then the Starobinsky-type inflation is probabilis... |
2107.07727 | Thomas Mieling | Thomas Mieling, Piotr T. Chru\'sciel, Stefan Palenta | The Electromagnetic Field in Gravitational Wave Interferometers | 52 pages, 2 figures | Class. Quantum Grav. 38 215004 (2021) | 10.1088/1361-6382/ac2270 | Preprint UWThPh-2021-11 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We analyse the response of laser interferometric gravitational wave detectors
using the full Maxwell equations in curved spacetime in the presence of weak
gravitational waves. Existence and uniqueness of solutions is ensured by
setting up a suitable boundary value problem. This puts on solid ground
previous approxima... | [
{
"created": "Fri, 16 Jul 2021 06:53:47 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Oct 2021 09:27:42 GMT",
"version": "v2"
}
] | 2021-10-19 | [
[
"Mieling",
"Thomas",
""
],
[
"Chruściel",
"Piotr T.",
""
],
[
"Palenta",
"Stefan",
""
]
] | We analyse the response of laser interferometric gravitational wave detectors using the full Maxwell equations in curved spacetime in the presence of weak gravitational waves. Existence and uniqueness of solutions is ensured by setting up a suitable boundary value problem. This puts on solid ground previous approximate... |
2212.10928 | Marek Li\v{s}ka | Ana Alonso-Serrano, Marek Li\v{s}ka and Antonio Vicente-Becerril | Friedmann equations and cosmic bounce in a modified cosmological
scenario | 8 pages, 2 figures, text matches the version published in PLB | null | 10.1016/j.physletb.2023.137827 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present a derivation of modified Raychaudhuri and Friedmann
equations from a phenomenological model of quantum gravity based on the
thermodynamics of spacetime. Starting from general gravitational equations of
motion which encode low-energy quantum gravity effects, we found its particular
solution for... | [
{
"created": "Wed, 21 Dec 2022 11:16:59 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2023 20:21:42 GMT",
"version": "v2"
}
] | 2023-09-13 | [
[
"Alonso-Serrano",
"Ana",
""
],
[
"Liška",
"Marek",
""
],
[
"Vicente-Becerril",
"Antonio",
""
]
] | In this work we present a derivation of modified Raychaudhuri and Friedmann equations from a phenomenological model of quantum gravity based on the thermodynamics of spacetime. Starting from general gravitational equations of motion which encode low-energy quantum gravity effects, we found its particular solution for h... |
2212.14297 | Emanuel Gallo | Gabriel Crisnejo, Emanuel Gallo, Ezequiel Boero and Osvaldo M.
Moreschi | Perturbative and numerical approach to plasma strong lensing | null | Phys. Rev. D 107, 084041 (2023) | 10.1103/PhysRevD.107.084041 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | {Using two different approaches, we study imaging in the strong lens regime
taking into account the effects of plasmatic environments on light propagation.
First, we extend the use of a perturbative approach that allows us to quickly
and analytically calculate the position and shape of the images of a circular
source... | [
{
"created": "Thu, 29 Dec 2022 13:20:15 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2023 22:18:25 GMT",
"version": "v2"
}
] | 2023-05-24 | [
[
"Crisnejo",
"Gabriel",
""
],
[
"Gallo",
"Emanuel",
""
],
[
"Boero",
"Ezequiel",
""
],
[
"Moreschi",
"Osvaldo M.",
""
]
] | {Using two different approaches, we study imaging in the strong lens regime taking into account the effects of plasmatic environments on light propagation. First, we extend the use of a perturbative approach that allows us to quickly and analytically calculate the position and shape of the images of a circular source l... |
gr-qc/0012041 | Yakov Itin | Yakov Itin | The generalized teleparallel structure | 2pp, LaTeX2e, uses ws-p9-75x6-50.cls. Contributed paper to the Ninth
Marcel Grossmann Meeting, Rome, Italy, July 2000 (to be published by World
Scientific, Singapore) | null | null | null | gr-qc | null | It is proposed to describe a teleparallel structure as a combination of a
Riemannian and a symplectic structure. The correspondent invariance group is an
intersection of the orthogonal and the symplectic groups. For a 4D manifold it
turns to be the basic group of the electro-week interaction $U(1)\times SU(2).$
| [
{
"created": "Tue, 12 Dec 2000 10:22:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Itin",
"Yakov",
""
]
] | It is proposed to describe a teleparallel structure as a combination of a Riemannian and a symplectic structure. The correspondent invariance group is an intersection of the orthogonal and the symplectic groups. For a 4D manifold it turns to be the basic group of the electro-week interaction $U(1)\times SU(2).$ |
0911.5595 | Lydia Philpott | Lydia Philpott | Particle simulations in causal set theory | 8 pages, 3 figures | Class. Quantum Grav. 27 (2010) 042001 | 10.1088/0264-9381/27/4/042001 | Imperial/TP/09/LP/1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models of particle propagation in causal set theory are investigated through
simulations. For the swerves model the simulations are shown to agree with the
expected continuum diffusion behaviour. Given the limitations on the simulated
causal set size, the agreement is far better than anticipated.
| [
{
"created": "Mon, 30 Nov 2009 09:49:09 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Philpott",
"Lydia",
""
]
] | Models of particle propagation in causal set theory are investigated through simulations. For the swerves model the simulations are shown to agree with the expected continuum diffusion behaviour. Given the limitations on the simulated causal set size, the agreement is far better than anticipated. |
2105.07101 | Oleg Tsupko | Volker Perlick and Oleg Yu. Tsupko | Calculating black hole shadows: Review of analytical studies | 42 pages | Physics Reports, 947, 1-39 (2022) | 10.1016/j.physrep.2021.10.004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we provide a review of the current state of the research of
the black hole shadow, focusing on analytical (as opposed to numerical and
observational) studies. We start with particular attention to the definition of
the shadow and its relation to the often used concepts of escape cone, critical
impact... | [
{
"created": "Sat, 15 May 2021 00:00:17 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2022 21:06:30 GMT",
"version": "v2"
}
] | 2022-01-27 | [
[
"Perlick",
"Volker",
""
],
[
"Tsupko",
"Oleg Yu.",
""
]
] | In this article, we provide a review of the current state of the research of the black hole shadow, focusing on analytical (as opposed to numerical and observational) studies. We start with particular attention to the definition of the shadow and its relation to the often used concepts of escape cone, critical impact p... |
0712.2032 | Ira Z. Rothstein | Rafael A. Porto (UCSB) and Ira Z. Rothstein (CMU) | Comment on `On the next-to-leading order gravitational spin(1)-spin(2)
dynamics' by J. Steinhoff et al | null | null | null | null | gr-qc | null | In this comment we explain the discrepancy found between the results in
arXiv:0712.1716v1 for the 3PN spin-spin potential and those previously derived
in gr-qc/0604099. We point out that to compare one must include sub-leading
lower order spin-orbit effects which contribute to the spin-spin potential once
one transfo... | [
{
"created": "Wed, 12 Dec 2007 20:28:09 GMT",
"version": "v1"
}
] | 2007-12-13 | [
[
"Porto",
"Rafael A.",
"",
"UCSB"
],
[
"Rothstein",
"Ira Z.",
"",
"CMU"
]
] | In this comment we explain the discrepancy found between the results in arXiv:0712.1716v1 for the 3PN spin-spin potential and those previously derived in gr-qc/0604099. We point out that to compare one must include sub-leading lower order spin-orbit effects which contribute to the spin-spin potential once one transform... |
gr-qc/0602079 | Jeremy S. Heyl | Jeremy S. Heyl (UBC) | Quantum Mechanical Fluctuations at the End of Inflation | 9 pages, 5 figures, corrected bibliography | J.Phys.A40:13997-14010,2007 | 10.1088/1751-8113/40/46/012 | null | gr-qc | null | During the inflationary phase of the early universe, quantum fluctuations in
the vacuum generate particles as they stretch beyond the Hubble length. These
fluctuations are thought to result in the density fluctuations and
gravitational radiation that we can try to observe today. It is possible to
calculate the quantu... | [
{
"created": "Mon, 20 Feb 2006 23:59:45 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Oct 2007 00:03:29 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Oct 2007 23:51:55 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Heyl",
"Jeremy S.",
"",
"UBC"
]
] | During the inflationary phase of the early universe, quantum fluctuations in the vacuum generate particles as they stretch beyond the Hubble length. These fluctuations are thought to result in the density fluctuations and gravitational radiation that we can try to observe today. It is possible to calculate the quantum-... |
gr-qc/0505011 | Shunichiro Kinoshita | Shunichiro Kinoshita, Hideaki Kudoh, Yuuiti Sendouda, and Katsuhiko
Sato | Quadrupole formula for Kaluza-Klein modes in the braneworld | 9 pages, no figures, REVTeX 4; version accepted for publication in
CQG | Class.Quant.Grav. 22 (2005) 3911-3922 | 10.1088/0264-9381/22/19/007 | UTAP-524, RESCEU-7/05 | gr-qc | null | The quadrupole formula in four-dimensional Einstein gravity is a useful tool
to describe gravitational wave radiation. We derive the quadrupole formula for
the Kaluza-Klein (KK) modes in the Randall-Sundrum braneworld model. The
quadrupole formula provides transparent representation of the exterior weak
gravitational... | [
{
"created": "Mon, 2 May 2005 14:12:25 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Sep 2005 07:14:30 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Kinoshita",
"Shunichiro",
""
],
[
"Kudoh",
"Hideaki",
""
],
[
"Sendouda",
"Yuuiti",
""
],
[
"Sato",
"Katsuhiko",
""
]
] | The quadrupole formula in four-dimensional Einstein gravity is a useful tool to describe gravitational wave radiation. We derive the quadrupole formula for the Kaluza-Klein (KK) modes in the Randall-Sundrum braneworld model. The quadrupole formula provides transparent representation of the exterior weak gravitational f... |
1306.0805 | Sumanta Chakraborty | Sumanta Chakraborty and Soumitra Sengupta | Radion cosmology and stabilization | Thoroughly revised; Matches published version | Eur. Phys. J. C 74, 3045 (2014) | 10.1140/epjc/s10052-014-3045-6 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We solve the Einstein's equation in five-dimensional spacetime for Randall
Sundrum Brane world model with time dependent radion field to study variation
of brane scale factor with time. We have shown that as radion field decreases
with time compactifying the extra dimension, the scale factor increases
exponentially w... | [
{
"created": "Sat, 1 Jun 2013 02:46:16 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Dec 2013 05:03:29 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Sep 2014 09:31:08 GMT",
"version": "v3"
}
] | 2014-09-12 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"Sengupta",
"Soumitra",
""
]
] | We solve the Einstein's equation in five-dimensional spacetime for Randall Sundrum Brane world model with time dependent radion field to study variation of brane scale factor with time. We have shown that as radion field decreases with time compactifying the extra dimension, the scale factor increases exponentially wit... |
gr-qc/0412119 | Shourov Chatterji | S Chatterji, L Blackburn, G Martin, and E Katsavounidis | Multiresolution techniques for the detection of gravitational-wave
bursts | Proceedings of the 8th Gravitational Wave Data Analysis Workshop,
Milwaukee, Wisconsin, 12 pages, 3 figures | Class.Quant.Grav. 21 (2004) S1809-S1818 | 10.1088/0264-9381/21/20/024 | null | gr-qc | null | We present two search algorithms that implement logarithmic tiling of the
time-frequency plane in order to efficiently detect astrophysically unmodeled
bursts of gravitational radiation. The first is a straightforward application
of the dyadic wavelet transform. The second is a modification of the windowed
Fourier tr... | [
{
"created": "Fri, 24 Dec 2004 02:42:31 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Chatterji",
"S",
""
],
[
"Blackburn",
"L",
""
],
[
"Martin",
"G",
""
],
[
"Katsavounidis",
"E",
""
]
] | We present two search algorithms that implement logarithmic tiling of the time-frequency plane in order to efficiently detect astrophysically unmodeled bursts of gravitational radiation. The first is a straightforward application of the dyadic wavelet transform. The second is a modification of the windowed Fourier tran... |
gr-qc/0205120 | L. C. Garcia de Andrade | L.C. Garcia de Andrade | Nongeodesic motion of spinless particles in the teleparallel
gravitational wave background | Latex file | null | null | null | gr-qc | null | The motion of spinless particles in Riemann-Cartan (RC) $U_{4}$ and
teleparallel spacetimes is revisited on the light of gravitational waves
hitting on the spinless test particles. It is shown that in the case Cartan
contortion is totally skew-symmetric the spinless particles follow geodesics
but if this symmetry is ... | [
{
"created": "Wed, 29 May 2002 00:19:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | The motion of spinless particles in Riemann-Cartan (RC) $U_{4}$ and teleparallel spacetimes is revisited on the light of gravitational waves hitting on the spinless test particles. It is shown that in the case Cartan contortion is totally skew-symmetric the spinless particles follow geodesics but if this symmetry is dr... |
2311.17554 | Samanwaya Mukherjee | Samanwaya Mukherjee, Sayak Datta, Khun Sang Phukon, Sukanta Bose | A phenomenological gravitational waveform model of binary black holes
incorporating horizon fluxes | null | null | null | LIGO-P2300183 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Subjected to the tidal field of its companion, each component of a coalescing
binary suffers a slow change in its mass (tidal heating) and spin (tidal
torquing) during the inspiral and merger. For black holes, these changes are
associated with their absorption of energy and angular momentum fluxes. This
effect modifi... | [
{
"created": "Wed, 29 Nov 2023 11:37:30 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2024 17:25:06 GMT",
"version": "v2"
}
] | 2024-01-24 | [
[
"Mukherjee",
"Samanwaya",
""
],
[
"Datta",
"Sayak",
""
],
[
"Phukon",
"Khun Sang",
""
],
[
"Bose",
"Sukanta",
""
]
] | Subjected to the tidal field of its companion, each component of a coalescing binary suffers a slow change in its mass (tidal heating) and spin (tidal torquing) during the inspiral and merger. For black holes, these changes are associated with their absorption of energy and angular momentum fluxes. This effect modifies... |
2405.10551 | Alejandro Torres-Orjuela | Alejandro Torres-Orjuela | Black hole spectroscopy with ground-based atom interferometer and
space-based laser interferometer gravitational wave detectors | 16 pages, 12 figures | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Gravitational wave (GW) detection has enabled us to test General Relativity
in an entirely new regime. A prominent role in tests of General Relativity
takes the detection of the Quasi-normal modes (QNMs) that arise as the highly
distorted remnant formed after the merger emits GWs until it becomes a regular
Kerr BH. A... | [
{
"created": "Fri, 17 May 2024 05:31:26 GMT",
"version": "v1"
}
] | 2024-05-29 | [
[
"Torres-Orjuela",
"Alejandro",
""
]
] | Gravitational wave (GW) detection has enabled us to test General Relativity in an entirely new regime. A prominent role in tests of General Relativity takes the detection of the Quasi-normal modes (QNMs) that arise as the highly distorted remnant formed after the merger emits GWs until it becomes a regular Kerr BH. Acc... |
1402.6639 | Vasiliy P. Neznamov | M.V. Gorbatenko, V.P. Neznamov | Equivalence and Hermiticity of Dirac Hamiltonians in the Kerr
gravitational field | 16 pages, accepted for publication in Annalen der Physik | null | 10.1002/andp.201400035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper, for the Kerr field, we prove that Chandrasekhar's Dirac
Hamiltonian and the self-adjoint Hamiltonian H_{\eta} with a flat scalar
product of the wave functions are physically equivalent. Operators of
transformation of Chandrasekhar's Hamiltonian and wave functions to the
\eta-representation with a flat s... | [
{
"created": "Wed, 26 Feb 2014 18:43:59 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Mar 2014 17:40:06 GMT",
"version": "v2"
},
{
"created": "Sun, 8 Jun 2014 05:57:16 GMT",
"version": "v3"
}
] | 2015-06-18 | [
[
"Gorbatenko",
"M. V.",
""
],
[
"Neznamov",
"V. P.",
""
]
] | In the paper, for the Kerr field, we prove that Chandrasekhar's Dirac Hamiltonian and the self-adjoint Hamiltonian H_{\eta} with a flat scalar product of the wave functions are physically equivalent. Operators of transformation of Chandrasekhar's Hamiltonian and wave functions to the \eta-representation with a flat sca... |
2405.04129 | Shahab Shahidi | Tiberiu Harko and Shahab Shahidi | Cosmological implications of the Weyl geometric gravity theory | 22 pages, 19 figures, accepted for publication in EPJC | null | null | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We consider cosmological implications of the Weyl geometric gravity theory.
The basic action of the model is obtained from the simplest conformally
invariant gravitational action, constructed, in Weyl geometry, from the square
of the Weyl scalar, the strength of the Weyl vector, and a matter term,
respectively. The t... | [
{
"created": "Tue, 7 May 2024 08:54:38 GMT",
"version": "v1"
}
] | 2024-05-08 | [
[
"Harko",
"Tiberiu",
""
],
[
"Shahidi",
"Shahab",
""
]
] | We consider cosmological implications of the Weyl geometric gravity theory. The basic action of the model is obtained from the simplest conformally invariant gravitational action, constructed, in Weyl geometry, from the square of the Weyl scalar, the strength of the Weyl vector, and a matter term, respectively. The tot... |
1807.06298 | Diego Rubiera-Garcia | H. Benbellout, J. Diaz-Alonso, D. Rubiera-Garcia | Structure and thermodynamics of charged nonrotating black holes in
higher dimensions | 26 pages, 11 figures. v2: added section V.D, added references, and
minor corrections | Phys. Rev. D 99, 084027 (2019) | 10.1103/PhysRevD.99.084027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the structural and thermodynamic properties of $D$-dimensional ($D
\geq 4$), asymptotically flat or Anti-de-Sitter, electrically charged black
hole solutions, resulting from the minimal coupling of general nonlinear
electrodynamics to General Relativity. This analysis deals with static
spherically symmetri... | [
{
"created": "Tue, 17 Jul 2018 09:32:51 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Feb 2019 16:23:26 GMT",
"version": "v2"
}
] | 2019-04-24 | [
[
"Benbellout",
"H.",
""
],
[
"Diaz-Alonso",
"J.",
""
],
[
"Rubiera-Garcia",
"D.",
""
]
] | We analyze the structural and thermodynamic properties of $D$-dimensional ($D \geq 4$), asymptotically flat or Anti-de-Sitter, electrically charged black hole solutions, resulting from the minimal coupling of general nonlinear electrodynamics to General Relativity. This analysis deals with static spherically symmetric ... |
1701.07003 | Dimitry Ayzenberg | Dimitry Ayzenberg, Nicolas Yunes | Black Hole Continuum Spectra as a Test of General Relativity: Quadratic
Gravity | 20 pages, 2 figures, 1 table. Updated to published version | Class. Quantum Grav. 34 (2017) 115003 | 10.1088/1361-6382/aa6dbc | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations of the continuum spectrum emitted by accretion disks around
black holes allows us to infer their properties, including possibly whether
black holes are described by the Kerr metric. Some modified gravity theories do
not admit the Kerr metric as a solution, and thus, continuum spectrum
observations could ... | [
{
"created": "Tue, 24 Jan 2017 18:24:09 GMT",
"version": "v1"
},
{
"created": "Thu, 18 May 2017 19:05:05 GMT",
"version": "v2"
}
] | 2017-05-22 | [
[
"Ayzenberg",
"Dimitry",
""
],
[
"Yunes",
"Nicolas",
""
]
] | Observations of the continuum spectrum emitted by accretion disks around black holes allows us to infer their properties, including possibly whether black holes are described by the Kerr metric. Some modified gravity theories do not admit the Kerr metric as a solution, and thus, continuum spectrum observations could be... |
0711.0254 | Tao Mei | T. Mei | An action with positive kinetic energy term for general relativity | 7 pages, no figure | null | null | null | gr-qc | null | At first, we state some results in arXiv: 0707.2639, and then, using a
positive kinetic energy coordinate condition given by arXiv: 0707.2639, we
present an action with positive kinetic energy term for general relativity.
Based on this action, the corresponding theory of canonical quantization is
discussed.
| [
{
"created": "Fri, 2 Nov 2007 07:35:54 GMT",
"version": "v1"
}
] | 2007-11-05 | [
[
"Mei",
"T.",
""
]
] | At first, we state some results in arXiv: 0707.2639, and then, using a positive kinetic energy coordinate condition given by arXiv: 0707.2639, we present an action with positive kinetic energy term for general relativity. Based on this action, the corresponding theory of canonical quantization is discussed. |
gr-qc/9510035 | Dario Nunez | Sergio A. Hojman and Dar\'io N\'u\~nez | Comment on "Quantum bound states with zero binding energy" | Accepted for publication in PHISICS LETTERS A | null | 10.1016/0375-9601(95)00820-9 | null | gr-qc | null | The purpose of this Comment is to show that the solutions to the zero energy
Schr\"odinger equations for monomial central potentials discussed in a recently
published Letter, may also be obtained from the corresponding free particle
solutions in a straight forwardly way, using an algorithm previously devised by
us. N... | [
{
"created": "Tue, 17 Oct 1995 15:39:33 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Hojman",
"Sergio A.",
""
],
[
"Núñez",
"Darío",
""
]
] | The purpose of this Comment is to show that the solutions to the zero energy Schr\"odinger equations for monomial central potentials discussed in a recently published Letter, may also be obtained from the corresponding free particle solutions in a straight forwardly way, using an algorithm previously devised by us. New... |
gr-qc/0612067 | Luis Lehner | C. Palenzuela, I. Olabarrieta, L. Lehner and S. Liebling | Head-on collisions of boson stars | null | Phys.Rev.D75:064005,2007 | 10.1103/PhysRevD.75.064005 | null | gr-qc astro-ph hep-th | null | We study head-on collisions of boson stars in three dimensions. We consider
evolutions of two boson stars which may differ in their phase or have opposite
frequencies but are otherwise identical. Our studies show that these phase
differences result in different late time behavior and gravitational wave
output.
| [
{
"created": "Mon, 11 Dec 2006 21:19:30 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Palenzuela",
"C.",
""
],
[
"Olabarrieta",
"I.",
""
],
[
"Lehner",
"L.",
""
],
[
"Liebling",
"S.",
""
]
] | We study head-on collisions of boson stars in three dimensions. We consider evolutions of two boson stars which may differ in their phase or have opposite frequencies but are otherwise identical. Our studies show that these phase differences result in different late time behavior and gravitational wave output. |
1212.6024 | Angelo Tartaglia | Angelo Tartaglia | Is time enough in order to know where you are? | 15 pages, 9 figures. Talk given at the Time Machine Factory TM12
conference, October 14-19, Turin, Italy, and to appear on the proceedings
thereof | null | 10.1051/epjconf/20135803003 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This talk discusses various aspects of the structure of space-time presenting
mechanisms leading to the explanation of the "rigidity" of the manifold and to
the emergence of time, i.e. of the Lorentzian signature. The proposed
ingredient is the analog, in four dimensions, of the deformation energy
associated with the... | [
{
"created": "Tue, 25 Dec 2012 11:33:43 GMT",
"version": "v1"
}
] | 2017-03-22 | [
[
"Tartaglia",
"Angelo",
""
]
] | This talk discusses various aspects of the structure of space-time presenting mechanisms leading to the explanation of the "rigidity" of the manifold and to the emergence of time, i.e. of the Lorentzian signature. The proposed ingredient is the analog, in four dimensions, of the deformation energy associated with the c... |
gr-qc/0611157 | Marc Henneaux | S. Deser and M. Henneaux | A note on spin two fields in curved backgrounds | 5 pages - Minor misprints corrected - Version accepted by Class.
Quant. Grav | Class.Quant.Grav.24:1683-1686,2007 | 10.1088/0264-9381/24/6/N01 | BRX TH-580, ULB-TH/06-31 | gr-qc astro-ph hep-th | null | We reconsider the consistency constraints on a free massless symmetric, rank
2, tensor field in a background and confirm that they uniquely require it to be
the linear deviation about (cosmological) Einstein gravity. Neither adding
non-minimal higher derivative terms nor changing the gauge transformations by
allowing... | [
{
"created": "Thu, 30 Nov 2006 13:54:44 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2007 11:23:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Deser",
"S.",
""
],
[
"Henneaux",
"M.",
""
]
] | We reconsider the consistency constraints on a free massless symmetric, rank 2, tensor field in a background and confirm that they uniquely require it to be the linear deviation about (cosmological) Einstein gravity. Neither adding non-minimal higher derivative terms nor changing the gauge transformations by allowing t... |
2012.09294 | Tatsuki Washimi Dr. | T. Washimi, T. Yokozawa, T. Tanaka, Y. Itoh, J. Kume, J. Yokoyama | Method for environmental noise estimation via injection tests for
ground-based gravitational wave detectors | null | Class. Quantum Grav. 38 125005 (2021) | 10.1088/1361-6382/abf89a | JGW-P2012122, RESCEU-23/20 | gr-qc astro-ph.IM physics.ins-det | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Environmental noise is one of the critical issues for the observation of
gravitational waves, but is difficult to predict in advance. Therefore, to
evaluate the adverse impact of environmental noise on the detector sensitivity,
understanding the detector response to the environmental noise in actual setup
is crucial,... | [
{
"created": "Wed, 16 Dec 2020 22:22:55 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Dec 2020 07:10:39 GMT",
"version": "v2"
},
{
"created": "Fri, 7 May 2021 11:55:42 GMT",
"version": "v3"
}
] | 2021-05-10 | [
[
"Washimi",
"T.",
""
],
[
"Yokozawa",
"T.",
""
],
[
"Tanaka",
"T.",
""
],
[
"Itoh",
"Y.",
""
],
[
"Kume",
"J.",
""
],
[
"Yokoyama",
"J.",
""
]
] | Environmental noise is one of the critical issues for the observation of gravitational waves, but is difficult to predict in advance. Therefore, to evaluate the adverse impact of environmental noise on the detector sensitivity, understanding the detector response to the environmental noise in actual setup is crucial, f... |
1801.00138 | Leonardo Giuliano Trombetta | Francisco D. Mazzitelli and Leonardo G. Trombetta | Comment on: "How the huge energy of quantum vacuum gravitates to drive
the slow accelerating expansion of the Universe" | null | Phys. Rev. D 97, 068301 (2018) | 10.1103/PhysRevD.97.068301 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper (Phys. Rev. D95, 103504 (2017)) it is argued that, due to
the fluctuations around its mean value, vacuum energy gravitates differently
from what previously assumed. As a consequence, the universe would accelerate
with a small Hubble expansion rate, solving the cosmological constant and dark
energy p... | [
{
"created": "Sat, 30 Dec 2017 14:47:37 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Mazzitelli",
"Francisco D.",
""
],
[
"Trombetta",
"Leonardo G.",
""
]
] | In a recent paper (Phys. Rev. D95, 103504 (2017)) it is argued that, due to the fluctuations around its mean value, vacuum energy gravitates differently from what previously assumed. As a consequence, the universe would accelerate with a small Hubble expansion rate, solving the cosmological constant and dark energy pro... |
gr-qc/9608066 | Oliver Rudolph | Oliver Rudolph | On the Classification of Decoherence Functionals | LaTeX2e, 13 pages | null | null | DESY 96-176 | gr-qc quant-ph | null | The basic ingredients of the consistent histories approach to quantum
mechanics are the space of histories and the space of decoherence functionals.
In this work we extend the classification theorem for decoherence functionals
proven by Isham, Linden and Schreckenberg to the case where the space of
histories is the l... | [
{
"created": "Wed, 28 Aug 1996 12:31:15 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Aug 1996 10:59:38 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Sep 1996 12:07:59 GMT",
"version": "v3"
},
{
"created": "Thu, 19 Dec 1996 15:35:28 GMT",
"version": "v4"
}
] | 2008-02-03 | [
[
"Rudolph",
"Oliver",
""
]
] | The basic ingredients of the consistent histories approach to quantum mechanics are the space of histories and the space of decoherence functionals. In this work we extend the classification theorem for decoherence functionals proven by Isham, Linden and Schreckenberg to the case where the space of histories is the lat... |
2309.05047 | Oem Trivedi | Oem Trivedi and Alexander V. Timoshkin | Little Rip, Pseudo Rip and bounce cosmology with generalized equation of
state in non-standard backgrounds | Matches the accepted version at EPJC, 21 pages, no figures | Eur.Phys.J.C 84 (2024) 3, 277 | 10.1140/epjc/s10052-024-12640-w | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The discovery of universe's late-time acceleration and dark energy has
overseen a great deal of research into cosmological singularities and
particularly future singularities. Perhaps the most extreme of such
singlarities is the big rip, which has propelled a lot of work into ways of
moderating it or seeking out alte... | [
{
"created": "Sun, 10 Sep 2023 14:49:57 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jul 2024 20:53:50 GMT",
"version": "v2"
}
] | 2024-07-25 | [
[
"Trivedi",
"Oem",
""
],
[
"Timoshkin",
"Alexander V.",
""
]
] | The discovery of universe's late-time acceleration and dark energy has overseen a great deal of research into cosmological singularities and particularly future singularities. Perhaps the most extreme of such singlarities is the big rip, which has propelled a lot of work into ways of moderating it or seeking out altern... |
1205.3805 | Shohreh Rahmati | Arundhati Dasgupta, Shohreh Rahmati | A Note on Vacuum Polarisation and Hawking Radiation | 11 pages, 2 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-examine vacuum polarisation of a scalar field in a quasi-local volume
including the horizon. We find that Hawking radiation rate is derived as a pure
decay of vacuum due to scalar field interaction with classical gravity exactly
in the same way as the origin of vacuum polarisation effect in Electrodynamics.
| [
{
"created": "Wed, 16 May 2012 20:41:29 GMT",
"version": "v1"
}
] | 2012-05-22 | [
[
"Dasgupta",
"Arundhati",
""
],
[
"Rahmati",
"Shohreh",
""
]
] | We re-examine vacuum polarisation of a scalar field in a quasi-local volume including the horizon. We find that Hawking radiation rate is derived as a pure decay of vacuum due to scalar field interaction with classical gravity exactly in the same way as the origin of vacuum polarisation effect in Electrodynamics. |
gr-qc/9711086 | Jai-chan Hwang | J. Hwang | Cosmological structures in generalized gravity | 3 pages, latex, mprocl.sty; The Eighth Marcel Grossmann Meeting on
General Relativity | null | null | null | gr-qc | null | In a class of generalized gravity theories with general couplings between the
scalar field and the scalar curvature in the Lagrangian, we describe the
quantum generation and the classical evolution processes of both the scalar and
tensor structures in a simple and unified manner.
| [
{
"created": "Fri, 28 Nov 1997 07:53:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hwang",
"J.",
""
]
] | In a class of generalized gravity theories with general couplings between the scalar field and the scalar curvature in the Lagrangian, we describe the quantum generation and the classical evolution processes of both the scalar and tensor structures in a simple and unified manner. |
1509.08399 | Gabriel Leon | Gabriel Leon, Lucila Kraiselburd, Susana J. Landau | Primordial gravitational waves and the collapse of the wave function | 18 pages, 2 figures. Replaced to match published version | Phys. Rev. D 92 083516 (2015) | 10.1103/PhysRevD.92.083516 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | "The self-induced collapse hypothesis" was introduced by D. Sudarsky and
collaborators to explain the origin of cosmic structure from a perfect
isotropic and homogeneous universe during the inflationary regime. In this
paper, we calculate the power spectrum for the tensor modes, within the
semiclassical gravity appro... | [
{
"created": "Mon, 28 Sep 2015 17:17:37 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2015 22:08:02 GMT",
"version": "v2"
}
] | 2015-11-02 | [
[
"Leon",
"Gabriel",
""
],
[
"Kraiselburd",
"Lucila",
""
],
[
"Landau",
"Susana J.",
""
]
] | "The self-induced collapse hypothesis" was introduced by D. Sudarsky and collaborators to explain the origin of cosmic structure from a perfect isotropic and homogeneous universe during the inflationary regime. In this paper, we calculate the power spectrum for the tensor modes, within the semiclassical gravity approxi... |
gr-qc/0701157 | Francesco Cianfrani dr | Francesco Cianfrani, Irene Milillo, Giovanni Montani | Dixon-Souriau equations from a 5-dimensional spinning particle in a
Kaluza-Klein framework | 20 pages, to appear on Physics Letters A | Phys.Lett.A366:7-13,2007 | 10.1016/j.physleta.2007.01.052 | null | gr-qc | null | The dimensional reduction of Papapetrou equations is performed in a
5-dimensional Kaluza-Klein background and Dixon-Souriau results for the motion
of a charged spinning body are obtained. The splitting provides an electric
dipole moment, and, for elementary particles, the induced parity and
time-reversal violations a... | [
{
"created": "Mon, 29 Jan 2007 09:38:29 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Mar 2007 09:19:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cianfrani",
"Francesco",
""
],
[
"Milillo",
"Irene",
""
],
[
"Montani",
"Giovanni",
""
]
] | The dimensional reduction of Papapetrou equations is performed in a 5-dimensional Kaluza-Klein background and Dixon-Souriau results for the motion of a charged spinning body are obtained. The splitting provides an electric dipole moment, and, for elementary particles, the induced parity and time-reversal violations are... |
1008.4333 | Daniel Guariento | J. A. S. Lima, Daniel C. Guariento, J. E. Horvath | Analytical solutions of accreting black holes immersed in a Lambda-CDM
model | 8 pages, 1 figure, accepted for publication in Physics Letters B | Phys.Lett.B693:218-220,2010 | 10.1016/j.physletb.2010.08.067 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of the mass of a black hole embedded in a universe filled with
dark energy and cold dark matter is calculated in a closed form within a test
fluid model in a Schwarzschild metric, taking into account the cosmological
evolution of both fluids. The result describes exactly how accretion
asymptotically swi... | [
{
"created": "Wed, 25 Aug 2010 18:20:23 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Lima",
"J. A. S.",
""
],
[
"Guariento",
"Daniel C.",
""
],
[
"Horvath",
"J. E.",
""
]
] | The evolution of the mass of a black hole embedded in a universe filled with dark energy and cold dark matter is calculated in a closed form within a test fluid model in a Schwarzschild metric, taking into account the cosmological evolution of both fluids. The result describes exactly how accretion asymptotically switc... |
1111.2701 | Chandra Mishra | Chandra Kant Mishra (RRI & IISc, India), K. G. Arun (CMI, India) and
Bala R. Iyer (RRI, India) | The 2.5PN linear momentum flux and associated recoil from inspiralling
compact binaries in quasi-circular orbits: Nonspinning case | 17 pages, 1 figure; This version includes the changes appearing in
the Erratum published in Phys. Rev. D | Physical Review D 85, 044021 (2012); Physical Review D 87,
069908(E) (2013) | 10.1103/PhysRevD.85.044021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anisotropic emission of gravitational waves (GWs) from inspiralling compact
binaries leads to the loss of linear momentum and hence gravitational recoil of
the system. The loss rate of linear momentum in the far-zone of the source (a
nonspinning binary system of black holes in quasicircular orbit) is
investigated at ... | [
{
"created": "Fri, 11 Nov 2011 10:30:50 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2013 09:56:39 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Mishra",
"Chandra Kant",
"",
"RRI & IISc, India"
],
[
"Arun",
"K. G.",
"",
"CMI, India"
],
[
"Iyer",
"Bala R.",
"",
"RRI, India"
]
] | Anisotropic emission of gravitational waves (GWs) from inspiralling compact binaries leads to the loss of linear momentum and hence gravitational recoil of the system. The loss rate of linear momentum in the far-zone of the source (a nonspinning binary system of black holes in quasicircular orbit) is investigated at th... |
2102.03057 | Serhii E. Samokhvalov | Serhii Samokhvalov | The phase symmetry of general relativity | 10 pages | Mathematical modeling, v.21 (2009), P.5-9 (Ukr) | null | null | gr-qc physics.class-ph | http://creativecommons.org/licenses/by/4.0/ | It is shown that the general relativity has a one-parameter compact symmetry
and this symmetry is analogous to the phase symmetry of quantum mechanics
| [
{
"created": "Fri, 5 Feb 2021 08:47:08 GMT",
"version": "v1"
}
] | 2021-04-27 | [
[
"Samokhvalov",
"Serhii",
""
]
] | It is shown that the general relativity has a one-parameter compact symmetry and this symmetry is analogous to the phase symmetry of quantum mechanics |
1909.00500 | Angel Rincon | Angel Rincon, Luciano Gabbanelli, Ernesto Contreras and Francisco
Tello-Ortiz | Minimal Geometric Deformation in a Reissner-Nordstr\"om background | 11 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article is devoted to the study of new exact analytical solutions in the
background of Reissner-Nordstr\"{o}m space-time by using gravitational
decoupling via minimal geometric deformation approach. To do so, we impose the
most general equation of state, relating the components of the $\theta$-sector
in order to... | [
{
"created": "Mon, 2 Sep 2019 01:26:42 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Rincon",
"Angel",
""
],
[
"Gabbanelli",
"Luciano",
""
],
[
"Contreras",
"Ernesto",
""
],
[
"Tello-Ortiz",
"Francisco",
""
]
] | This article is devoted to the study of new exact analytical solutions in the background of Reissner-Nordstr\"{o}m space-time by using gravitational decoupling via minimal geometric deformation approach. To do so, we impose the most general equation of state, relating the components of the $\theta$-sector in order to o... |
2402.13053 | Bradley James Kavanagh | Theophanes K. Karydas, Bradley J. Kavanagh, Gianfranco Bertone | Sharpening the dark matter signature in gravitational waveforms I:
Accretion and eccentricity evolution | 19 pages, 14 figures + appendices. Companion paper to "Sharpening the
dark matter signature in gravitational waveforms II: Numerical simulations
with the NbodyIMRI code" (arXiv:2402.13762). v2: Added references | null | null | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter overdensities around black holes can alter the dynamical
evolution of a companion object orbiting around it, and cause a dephasing of
the gravitational waveform. Here, we present a refined calculation of the
co-evolution of the binary and the dark matter distribution, taking into
account the accretion of ... | [
{
"created": "Tue, 20 Feb 2024 14:41:41 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Feb 2024 18:50:03 GMT",
"version": "v2"
}
] | 2024-02-29 | [
[
"Karydas",
"Theophanes K.",
""
],
[
"Kavanagh",
"Bradley J.",
""
],
[
"Bertone",
"Gianfranco",
""
]
] | Dark matter overdensities around black holes can alter the dynamical evolution of a companion object orbiting around it, and cause a dephasing of the gravitational waveform. Here, we present a refined calculation of the co-evolution of the binary and the dark matter distribution, taking into account the accretion of da... |
1510.03147 | Konstantin Osetrin | Konstantin Osetrin, Altair Filippov, Evgeny Osetrin | The space-time models with dust matter that admit separation of
variables in Hamilton-Jacobi equations of a test particle | 14 pages | null | 10.1142/S0217732316500279 | MPLA-D-15-00314 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The characteristics of dust matter in space-time models, admitting the
existence of privilege coordinate systems are given, where the single-particle
Hamilton-Jacobi equation can be integrated by the method of complete separation
of variables. The resulting functional form of the 4-velocity field and energy
density o... | [
{
"created": "Mon, 12 Oct 2015 05:55:49 GMT",
"version": "v1"
}
] | 2016-03-16 | [
[
"Osetrin",
"Konstantin",
""
],
[
"Filippov",
"Altair",
""
],
[
"Osetrin",
"Evgeny",
""
]
] | The characteristics of dust matter in space-time models, admitting the existence of privilege coordinate systems are given, where the single-particle Hamilton-Jacobi equation can be integrated by the method of complete separation of variables. The resulting functional form of the 4-velocity field and energy density of ... |
1809.02837 | Rodrigo Panosso Macedo | Rodrigo Panosso Macedo, Jos\'e Luis Jaramillo, Marcus Ansorg | Hyperboloidal slicing approach to quasi-normal mode expansions: the
Reissner-Nordstr\"om case | 24 pages, 6 figures | Phys. Rev. D 98, 124005 (2018) | 10.1103/PhysRevD.98.124005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quasi-normal modes of black holes, with a focus on resonant (or
quasi-normal mode) expansions, in a geometric frame based on the use of
conformal compactifications together with hyperboloidal foliations of
spacetime. Specifically, this work extends the previous study of Schwarzschild
in this geometric approa... | [
{
"created": "Sat, 8 Sep 2018 17:19:59 GMT",
"version": "v1"
}
] | 2018-12-19 | [
[
"Macedo",
"Rodrigo Panosso",
""
],
[
"Jaramillo",
"José Luis",
""
],
[
"Ansorg",
"Marcus",
""
]
] | We study quasi-normal modes of black holes, with a focus on resonant (or quasi-normal mode) expansions, in a geometric frame based on the use of conformal compactifications together with hyperboloidal foliations of spacetime. Specifically, this work extends the previous study of Schwarzschild in this geometric approach... |
1911.11990 | Yen Chin Ong | Hao Xu, Yen Chin Ong, Man-Hong Yung | Cosmic Censorship and the Evolution of d-Dimensional Charged Evaporating
Black Holes | 7 pages, 3 figures; v3: fixed number of photon polarization; version
accepted by PRD | Phys. Rev. D 101, 064015 (2020) | 10.1103/PhysRevD.101.064015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmic censorship conjecture essentially states that naked singularities
should not form from generic initial conditions. Since black hole parameters
can change their values under Hawking evaporation, one has to ask whether it is
possible to reach extremality by simply waiting for the black hole to
evaporate. If ... | [
{
"created": "Wed, 27 Nov 2019 07:08:44 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2019 12:58:56 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Feb 2020 09:16:20 GMT",
"version": "v3"
}
] | 2020-03-11 | [
[
"Xu",
"Hao",
""
],
[
"Ong",
"Yen Chin",
""
],
[
"Yung",
"Man-Hong",
""
]
] | The cosmic censorship conjecture essentially states that naked singularities should not form from generic initial conditions. Since black hole parameters can change their values under Hawking evaporation, one has to ask whether it is possible to reach extremality by simply waiting for the black hole to evaporate. If so... |
2201.03118 | Vladimir Ivashchuk | K. K. Ernazarov and V. D. Ivashchuk | Stable exponential cosmological type solutions with three factor spaces
in EGB model with a $\Lambda$-term | Semi-review, 23 pages, 1 figure, LaTex. Several typos in the text and
a typo in eq. (2.3) are eliminated. A paragraph is added in the end of
Introduction. Two references are added and one ref. is omitted | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a $D$-dimensional Einstein-Gauss-Bonnet model which includes the
Gauss-Bonnet term, the cosmological term $\Lambda$ and two non-zero constants:
$\alpha_1$ and $\alpha_2$. Under imposing the metric to be diagonal one, we
find cosmological type solutions with exponential dependence of three scale
factors in a ... | [
{
"created": "Mon, 10 Jan 2022 00:05:34 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2022 21:32:41 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Jun 2022 20:58:16 GMT",
"version": "v3"
}
] | 2022-06-23 | [
[
"Ernazarov",
"K. K.",
""
],
[
"Ivashchuk",
"V. D.",
""
]
] | We study a $D$-dimensional Einstein-Gauss-Bonnet model which includes the Gauss-Bonnet term, the cosmological term $\Lambda$ and two non-zero constants: $\alpha_1$ and $\alpha_2$. Under imposing the metric to be diagonal one, we find cosmological type solutions with exponential dependence of three scale factors in a va... |
1103.1083 | Mandar Patil | Mandar Patil and Pankaj S. Joshi | High Energy Particle Collisions in Superspinning Kerr Geometry | 7 pages, 2 figures. Matches the version published in Phys. Rev. D.
Significant changes in the manuscript. Title changed | Physical Review D 84, 104001 (2011) | 10.1103/PhysRevD.84.104001 | null | gr-qc astro-ph.HE hep-ex hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate here the particle acceleration and high energy collision in
the Kerr geometry containing a naked singularity. We show that the center of
mass energy of collision between two particles, dropped in from a finite but
arbitrarily large distance along the axis of symmetry is arbitrarily large,
provided the ... | [
{
"created": "Sat, 5 Mar 2011 21:12:18 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2011 11:44:43 GMT",
"version": "v2"
}
] | 2011-11-17 | [
[
"Patil",
"Mandar",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We investigate here the particle acceleration and high energy collision in the Kerr geometry containing a naked singularity. We show that the center of mass energy of collision between two particles, dropped in from a finite but arbitrarily large distance along the axis of symmetry is arbitrarily large, provided the de... |
1609.02429 | Sebastian Steinhaus | Bianca Dittrich, Erik Schnetter, Cameron J. Seth, Sebastian Steinhaus | Coarse graining flow of spin foam intertwiners | 33 + 8 pages, 10 figures, 2 tables; v2: 2 plots added visualizing
results, references updated. Matching published version | Phys. Rev. D 94, 124050 (2016) | 10.1103/PhysRevD.94.124050 | null | gr-qc cond-mat.str-el hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simplicity constraints play a crucial role in the construction of spin foam
models, yet their effective behaviour on larger scales is scarcely explored. In
this article we introduce intertwiner and spin net models for the quantum group
$\text{SU}(2)_k \times \text{SU}(2)_k$, which implement the simplicity
constraints... | [
{
"created": "Thu, 8 Sep 2016 13:54:28 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jan 2017 16:03:06 GMT",
"version": "v2"
}
] | 2017-01-06 | [
[
"Dittrich",
"Bianca",
""
],
[
"Schnetter",
"Erik",
""
],
[
"Seth",
"Cameron J.",
""
],
[
"Steinhaus",
"Sebastian",
""
]
] | Simplicity constraints play a crucial role in the construction of spin foam models, yet their effective behaviour on larger scales is scarcely explored. In this article we introduce intertwiner and spin net models for the quantum group $\text{SU}(2)_k \times \text{SU}(2)_k$, which implement the simplicity constraints a... |
gr-qc/0010016 | Irina Dymnikowa | Irina Dymnikova (University of Warmia and Mazury, Poland) | Variable cosmological term - geometry and physics | 20 pages, Revtex, 21 figures, Talk at the International Seminar
"Mathematical Physics and Applied Mathematics" in memory of Prof. G. A.
Grinberg, 16 June 2000, St.Petersburg, Russia | null | null | null | gr-qc | null | We describe the dynamics of a cosmological term in the spherically symmetric
case by an r-dependent second rank symmetric tensor \Lambda_{\mu\nu} invariant
under boosts in the radial direction. The cosmological tensor \Lambda_{\mu\nu}
represents the extension of the Einstein cosmological term \Lambda g_{\mu\nu}
which... | [
{
"created": "Wed, 4 Oct 2000 12:21:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dymnikova",
"Irina",
"",
"University of Warmia and Mazury, Poland"
]
] | We describe the dynamics of a cosmological term in the spherically symmetric case by an r-dependent second rank symmetric tensor \Lambda_{\mu\nu} invariant under boosts in the radial direction. The cosmological tensor \Lambda_{\mu\nu} represents the extension of the Einstein cosmological term \Lambda g_{\mu\nu} which a... |
0812.2600 | Chen Songbai | Songbai Chen, Jiliang Jing | Dynamical evolution of phantom scalar perturbation in the background of
Schwarzschild black String spacetime | 11 pages, 5 figures. Accepted by JHEP for publication | JHEP 0903:081,2009 | 10.1088/1126-6708/2009/03/081 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using Leaver's continue fraction and time domain method, we study the wave
dynamics of phantom scalar perturbation in a Schwarzschild black string
spacetime. We find that the quasinormal modes contain the imprint from the
wavenumber $k$ of the fifth dimension. The late-time behaviors are dominated by
the difference b... | [
{
"created": "Sun, 14 Dec 2008 03:06:39 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Feb 2009 01:04:58 GMT",
"version": "v2"
}
] | 2009-03-19 | [
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | Using Leaver's continue fraction and time domain method, we study the wave dynamics of phantom scalar perturbation in a Schwarzschild black string spacetime. We find that the quasinormal modes contain the imprint from the wavenumber $k$ of the fifth dimension. The late-time behaviors are dominated by the difference bet... |
1805.07649 | Yuri Pavlov | Yu. V. Pavlov, O. B. Zaslavskii | Kinematic censorship as a constraint on allowed scenarios of high energy
particle collisions | 8 pages. Matches published version | Grav. Cosmol. 25 (2019) 390-396 | 10.1134/S0202289319040091 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent years, it was found that the energy $E_{c.m.}$ in the centre of
mass frame of two colliding particles can be unbounded near black holes. If
collision occurs exactly on the horizon, $E_{c.m.}$ is formally infinite.
However, in any physically reasonable situation this is impossible. We collect
different scena... | [
{
"created": "Sat, 19 May 2018 20:23:02 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2019 15:46:29 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Sep 2019 13:27:41 GMT",
"version": "v3"
},
{
"created": "Mon, 9 Dec 2019 20:41:07 GMT",
"version": "v4"
}
] | 2019-12-11 | [
[
"Pavlov",
"Yu. V.",
""
],
[
"Zaslavskii",
"O. B.",
""
]
] | In recent years, it was found that the energy $E_{c.m.}$ in the centre of mass frame of two colliding particles can be unbounded near black holes. If collision occurs exactly on the horizon, $E_{c.m.}$ is formally infinite. However, in any physically reasonable situation this is impossible. We collect different scenari... |
1412.4001 | Blake Temple | Joel Smoller, Blake Temple, Zeke Vogler | An Instability of the Standard Model Creates the Anomalous Acceleration
Without Dark Energy | null | null | null | null | gr-qc astro-ph.CO math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new asymptotic ansatz for spherical perturbations of the
Standard Model of Cosmology (SM) which applies during the $p=0$ epoch, and
prove that these perturbations trigger instabilities in the SM on the scale of
the supernova data. These instabilities create a large, central region of
uniform under-dens... | [
{
"created": "Thu, 11 Dec 2014 01:32:14 GMT",
"version": "v1"
}
] | 2014-12-15 | [
[
"Smoller",
"Joel",
""
],
[
"Temple",
"Blake",
""
],
[
"Vogler",
"Zeke",
""
]
] | We introduce a new asymptotic ansatz for spherical perturbations of the Standard Model of Cosmology (SM) which applies during the $p=0$ epoch, and prove that these perturbations trigger instabilities in the SM on the scale of the supernova data. These instabilities create a large, central region of uniform under-densit... |
2104.09228 | Paingalil Kunjan Suresh | P K Suresh | Curvaton and quantum gravity effect on the tensor to scalar ratio of the
chaotic inflation | To appear in MPLA, Title changed and typoes fixed. 8 pages, 4 figures | Mod. Phys. Lett. A 36 (2021) 2150204 | 10.1142/S0217732321502047 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The expected tensor-to-scalar ratio estimate of the upcoming CMB mission
probe measurements may establish a lower value of the ratio than the currently
obtained value. It can be described in terms of a single field chaotic
inflation model along with the curvaton or quantum gravity or their combined
effect. Consequent... | [
{
"created": "Mon, 19 Apr 2021 11:52:52 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Aug 2021 10:28:19 GMT",
"version": "v2"
}
] | 2021-09-28 | [
[
"Suresh",
"P K",
""
]
] | The expected tensor-to-scalar ratio estimate of the upcoming CMB mission probe measurements may establish a lower value of the ratio than the currently obtained value. It can be described in terms of a single field chaotic inflation model along with the curvaton or quantum gravity or their combined effect. Consequently... |
1004.0306 | Babak Vakili | Babak Vakili | Classical and quantum dynamics of a perfect fluid scalar-metric
cosmology | 14 pages, 8 figures, to appear in PLB, Refs. added, This work is
dedicated to the revered memory of Prof. Masoud Alimohammadi | Phys.Lett.B688:129-136,2010 | 10.1016/j.physletb.2010.04.007 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical and quantum models of a Friedmann-Robertson-Walker
(FRW) cosmology, coupled to a perfect fluid, in the context of the
scalar-metric gravity. Using the Schutz' representation for the perfect fluid,
we show that, under a particular gauge choice, it may lead to the
identification of a time paramet... | [
{
"created": "Fri, 2 Apr 2010 09:46:20 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Apr 2010 05:25:53 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Vakili",
"Babak",
""
]
] | We study the classical and quantum models of a Friedmann-Robertson-Walker (FRW) cosmology, coupled to a perfect fluid, in the context of the scalar-metric gravity. Using the Schutz' representation for the perfect fluid, we show that, under a particular gauge choice, it may lead to the identification of a time parameter... |
gr-qc/9802053 | Dominic Clancy | Dominic Clancy, James E. Lidsey and Reza Tavakol | Scale Factor Dualities in Anisotropic Cosmologies | 28 pages, Latex source | Class.Quant.Grav. 15 (1998) 257-272 | 10.1088/0264-9381/15/2/002 | null | gr-qc hep-th | null | The concept of scale factor duality is considered within the context of the
spatially homogeneous, vacuum Brans-Dicke cosmologies. In the Bianchi class A,
it is found that duality symmetries exist for the types I, II, VI_0, VII_0, but
not for types VIII and IX. The Kantowski-Sachs and locally rotationally
symmetric B... | [
{
"created": "Thu, 19 Feb 1998 19:48:48 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Clancy",
"Dominic",
""
],
[
"Lidsey",
"James E.",
""
],
[
"Tavakol",
"Reza",
""
]
] | The concept of scale factor duality is considered within the context of the spatially homogeneous, vacuum Brans-Dicke cosmologies. In the Bianchi class A, it is found that duality symmetries exist for the types I, II, VI_0, VII_0, but not for types VIII and IX. The Kantowski-Sachs and locally rotationally symmetric Bia... |
2006.16812 | Alexander Kamenshchik | Andrei O. Barvinsky and Alexander Yu. Kamenshchik | Preferred basis, decoherence and a quantum state of the Universe | 25 pages, 3 figures, prepared for the publication in the Springer
series "Fundamental Theories of Physics", in the volume, dedicated to the
memory of H. D. Zeh. arXiv admin note: text overlap with arXiv:1302.5545 | null | 10.1007/978-3-030-88781-0_6 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review a number of issues in foundations of quantum theory and quantum
cosmology including, in particular, the problem of the preferred basis in the
many-worlds interpretation of quantum mechanics, the relation between this
interpretation and the decoherence phenomenon, application of decoherence
approach to quant... | [
{
"created": "Sun, 28 Jun 2020 18:07:59 GMT",
"version": "v1"
}
] | 2022-04-27 | [
[
"Barvinsky",
"Andrei O.",
""
],
[
"Kamenshchik",
"Alexander Yu.",
""
]
] | We review a number of issues in foundations of quantum theory and quantum cosmology including, in particular, the problem of the preferred basis in the many-worlds interpretation of quantum mechanics, the relation between this interpretation and the decoherence phenomenon, application of decoherence approach to quantum... |
1511.01106 | James Mertens | James B. Mertens, John T. Giblin Jr, Glenn D. Starkman | Integration of inhomogeneous cosmological spacetimes in the BSSN
formalism | Updated to match published version | Phys. Rev. D 93, 124059 (2016) | 10.1103/PhysRevD.93.124059 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present cosmological-scale numerical simulations of an evolving universe
in full general relativity (GR) and introduce a new numerical tool, {\sc
CosmoGRaPH}, which employs the Baumgarte-Shapiro-Shibata-Nakamura (BSSN)
formalism on a 3-dimensional grid. Using {\sc CosmoGRaPH}, we calculate the
effect of an inhomog... | [
{
"created": "Tue, 3 Nov 2015 21:03:07 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Nov 2015 20:02:42 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jun 2016 15:20:40 GMT",
"version": "v3"
}
] | 2016-06-27 | [
[
"Mertens",
"James B.",
""
],
[
"Giblin",
"John T.",
"Jr"
],
[
"Starkman",
"Glenn D.",
""
]
] | We present cosmological-scale numerical simulations of an evolving universe in full general relativity (GR) and introduce a new numerical tool, {\sc CosmoGRaPH}, which employs the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formalism on a 3-dimensional grid. Using {\sc CosmoGRaPH}, we calculate the effect of an inhomogen... |
gr-qc/0410130 | Uwe Gunther | Uwe Guenther, Alexander Zhuk | Phenomenology of brane-world cosmological models | To appear in the proceedings of Astrophysics and Cosmology after
Gamow: Theory and Observations: Gamow Memorial International Conference
dedicated to the 100th Anniversary of George Gamow, Odessa, Ukraine, 8-14
August 2004; 18 pages, 2 figures; minor improvements, Refs. added | Astrophysics and Cosmology after Gamow, Edt. by G.S.
Bisnovaty-Kogan, S.Silich, E. Terlevich, A. Zhuk. Cambridge Scientific
Publishers, Cambridge, 2007. Pp. 79-97 | null | null | gr-qc astro-ph hep-ph | null | We present a brief review of brane-world models - models in which our
observable Universe with its standard matter fields is assumed as localized on
a domain wall (three-brane) in a higher dimensional surrounding (bulk)
spacetime. Models of this type arise naturally in M-theory and have been
intensively studied durin... | [
{
"created": "Wed, 27 Oct 2004 09:32:35 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Nov 2004 16:20:21 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Nov 2004 11:10:04 GMT",
"version": "v3"
}
] | 2020-04-16 | [
[
"Guenther",
"Uwe",
""
],
[
"Zhuk",
"Alexander",
""
]
] | We present a brief review of brane-world models - models in which our observable Universe with its standard matter fields is assumed as localized on a domain wall (three-brane) in a higher dimensional surrounding (bulk) spacetime. Models of this type arise naturally in M-theory and have been intensively studied during ... |
1007.4087 | Christian Corda cordac | Christian Corda | Primordial inflation from gravity's rainbow | To appear in the AIP Proceedings of the 8th International Conference
of Numerical Analysis and Applied Mathematics, Hotel Rodos Palace, Rhodes,
Greece, 19-25 September 2010 | AIP Conf. Proc. 1281:847,2010 | 10.1063/1.3498620 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper, which has been published in Nature, the LIGO Scientific
Collaboration (LSC) obtained an upper limit on the stochastic
gravitational-wave background of cosmological origin by using the data from a
two-year science run of the Laser Interferometer Gravitational- wave
Observatory (LIGO). Such an upper ... | [
{
"created": "Fri, 23 Jul 2010 09:54:19 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Corda",
"Christian",
""
]
] | In a recent paper, which has been published in Nature, the LIGO Scientific Collaboration (LSC) obtained an upper limit on the stochastic gravitational-wave background of cosmological origin by using the data from a two-year science run of the Laser Interferometer Gravitational- wave Observatory (LIGO). Such an upper li... |
1807.07434 | Wlodzimierz Piechocki | Andrzej G\'o\'zd\'z, W{\l}odzimierz Piechocki, Grzegorz Plewa | Quantum Belinski-Khalatnikov-Lifshitz scenario | 33 pages, 4 figures, version accepted for publication in European
Physical Journal C. arXiv admin note: substantial text overlap with
arXiv:1705.04023 | null | 10.1140/epjc/s10052-019-6571-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the quantum model of the asymptotic dynamics underlying the
Belinski-Khalatnikov-Lifshitz (BKL) scenario. The symmetry of the physical
phase space enables making use of the affine coherent states quantization. Our
results show that quantum dynamics is regular in the sense that during quantum
evolution the ... | [
{
"created": "Wed, 18 Jul 2018 07:05:44 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jul 2018 06:20:51 GMT",
"version": "v2"
},
{
"created": "Sat, 5 Jan 2019 11:42:49 GMT",
"version": "v3"
}
] | 2019-02-20 | [
[
"Góźdź",
"Andrzej",
""
],
[
"Piechocki",
"Włodzimierz",
""
],
[
"Plewa",
"Grzegorz",
""
]
] | We present the quantum model of the asymptotic dynamics underlying the Belinski-Khalatnikov-Lifshitz (BKL) scenario. The symmetry of the physical phase space enables making use of the affine coherent states quantization. Our results show that quantum dynamics is regular in the sense that during quantum evolution the ex... |
gr-qc/0302107 | Gennady L. Krasnikov | S. Krasnikov | The wormhole hazard | Talk given at "Time and Matter", Venice 2002 | null | null | null | gr-qc | null | To predict the outcome of (almost) any experiment we have to assume that our
spacetime is globally hyperbolic. The wormholes, if they exist, cast doubt on
the validity of this assumption. At the same time, no evidence has been found
so far (either observational, or theoretical) that the possibility of their
existence... | [
{
"created": "Wed, 26 Feb 2003 13:42:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krasnikov",
"S.",
""
]
] | To predict the outcome of (almost) any experiment we have to assume that our spacetime is globally hyperbolic. The wormholes, if they exist, cast doubt on the validity of this assumption. At the same time, no evidence has been found so far (either observational, or theoretical) that the possibility of their existence c... |
1501.03960 | Leonardo Fernandez-Jambrina | L. Fern\'andez-Jambrina | Singularities around w=-1 | Typo ammended. 4 pages, Spanish Relativity Meeting 2011, Towards new
paradigms, Madrid, Spain | AIP Conference Proceedings 1458, 391-394 (2012) | 10.1063/1.4734442 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we would like to analyse the appearance of singularities in FLRW
cosmological models which evolve close to w=-1, where w is the barotropic index
of the universe. We relate small terms in cosmological time around w=-1 with
the correspondent scale factor of the universe and check for the formation of
singu... | [
{
"created": "Fri, 16 Jan 2015 12:09:43 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 2015 07:29:36 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Fernández-Jambrina",
"L.",
""
]
] | In this talk we would like to analyse the appearance of singularities in FLRW cosmological models which evolve close to w=-1, where w is the barotropic index of the universe. We relate small terms in cosmological time around w=-1 with the correspondent scale factor of the universe and check for the formation of singula... |
1208.2996 | Luis P. Chimento | Luis P. Chimento and Pablo Labraga | Asymptotic behaviour of Bianchi VI(o) solutions with an exponential
potential scalar field | 4 pages; Proceedings of the Spanish Relativistic Meeting (ERE-96),
Valencia, Espa\~na 1996. Publisshed in 1997 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain some solutions to the Einstein-Klein-Gordon equations without a
cosmological constant for an exponential potential scalar field in a Bianchi
VI$_0$ metric and investigate their behaviour.
| [
{
"created": "Wed, 15 Aug 2012 00:04:30 GMT",
"version": "v1"
}
] | 2012-08-16 | [
[
"Chimento",
"Luis P.",
""
],
[
"Labraga",
"Pablo",
""
]
] | We obtain some solutions to the Einstein-Klein-Gordon equations without a cosmological constant for an exponential potential scalar field in a Bianchi VI$_0$ metric and investigate their behaviour. |
2102.10402 | Tyler McMaken | Tyler McMaken and Andrew J. S. Hamilton | Geometry near the inner horizon of a rotating, accreting black hole | 19 pages, 9 figures, 1 appendix | Phys. Rev. D 103, 084014 (2021) | 10.1103/PhysRevD.103.084014 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Here we present a novel classical model to describe the near-inner horizon
geometry of a rotating, accreting black hole. The model assumes spacetime is
homogeneous and is sourced by radial streams of a collisionless, null fluid,
and it predicts that the standard Poisson-Israel mass inflation phenomenon will
be interr... | [
{
"created": "Sat, 20 Feb 2021 17:53:31 GMT",
"version": "v1"
}
] | 2021-04-14 | [
[
"McMaken",
"Tyler",
""
],
[
"Hamilton",
"Andrew J. S.",
""
]
] | Here we present a novel classical model to describe the near-inner horizon geometry of a rotating, accreting black hole. The model assumes spacetime is homogeneous and is sourced by radial streams of a collisionless, null fluid, and it predicts that the standard Poisson-Israel mass inflation phenomenon will be interrup... |
1508.03304 | Manuel Hohmann | Manuel Hohmann | Non-metric fluid dynamics and cosmology on Finsler spacetimes | 10 pages, no figures; to appear in the conference proceedings of the
9th Alexander Friedmann International Seminar, International Journal of
Modern Physics: Conference Series, World Scientific Publishing Company | Int. J. Mod. Phys. A 31 (2016) 1641012 | 10.1142/S0217751X16410128 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the kinetic theory of fluids, in which the description of
fluids is based on the geodesic motion of particles, to spacetimes modeled by
Finsler geometry. Our results show that Finsler spacetimes are a suitable
background for fluid dynamics and that the equation of motion for a
collisionless fluid is giv... | [
{
"created": "Thu, 13 Aug 2015 18:52:31 GMT",
"version": "v1"
}
] | 2016-01-25 | [
[
"Hohmann",
"Manuel",
""
]
] | We generalize the kinetic theory of fluids, in which the description of fluids is based on the geodesic motion of particles, to spacetimes modeled by Finsler geometry. Our results show that Finsler spacetimes are a suitable background for fluid dynamics and that the equation of motion for a collisionless fluid is given... |
2112.14730 | Samarth Chawla | Samarth Chawla and Maulik Parikh | Quantum Gravity Corrections to the Fall of the Apple | 13 pages, LaTeX. v3: references added, expanded discussion | Phys. Rev. D 107, 066024 (2023) | 10.1103/PhysRevD.107.066024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the motion of a massive particle in a static, weakly-curved
spacetime where the gravitational field is taken to be quantized. We find that
Newton's law of free-fall is modified by quantum-gravitational corrections, in
addition to the known special-relativistic and post-Newtonian modifications.
The quantum... | [
{
"created": "Wed, 29 Dec 2021 18:36:14 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2022 10:28:44 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Mar 2023 23:26:40 GMT",
"version": "v3"
}
] | 2023-04-13 | [
[
"Chawla",
"Samarth",
""
],
[
"Parikh",
"Maulik",
""
]
] | We consider the motion of a massive particle in a static, weakly-curved spacetime where the gravitational field is taken to be quantized. We find that Newton's law of free-fall is modified by quantum-gravitational corrections, in addition to the known special-relativistic and post-Newtonian modifications. The quantum-g... |
0707.0520 | Molin Liu | Molin Liu, Hongya Liu, Chunxiao Wang, Yongli Ping | The Real Scalar Field Equation for Nariai Black Hole in the 5D
Schwarzschild-de Sitter Black String Space | 10 pages,6 figures.To appear in Int. J. Mod. Phys. A | Int.J.Mod.Phys.A22:4451-4465,2007 | 10.1142/S0217751X07037044 | null | gr-qc | null | The Nariai black hole, whose two horizons are lying close to each other, is
an extreme and important case in the research of black hole. In this paper we
study the evolution of a massless scalar field scattered around in 5D
Schwarzschild-de Sitter black string space. Using the method shown by Brevik
and Simonsen (200... | [
{
"created": "Wed, 4 Jul 2007 00:20:31 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Apr 2008 02:30:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Liu",
"Molin",
""
],
[
"Liu",
"Hongya",
""
],
[
"Wang",
"Chunxiao",
""
],
[
"Ping",
"Yongli",
""
]
] | The Nariai black hole, whose two horizons are lying close to each other, is an extreme and important case in the research of black hole. In this paper we study the evolution of a massless scalar field scattered around in 5D Schwarzschild-de Sitter black string space. Using the method shown by Brevik and Simonsen (2001)... |
2305.10864 | Muhammad Al-Zafar Khan | Muhammad Al-Zafar Khan, Riven Narain | Lie Symmetry Analysis of the Einstein-Maxwell Equations for Quark Stars | 19 pages | null | null | null | gr-qc math-ph math.MP nlin.SI | http://creativecommons.org/licenses/by/4.0/ | We derive the Lie point symmetries for the MIT Bag Model for quark stars in
relativistic astrophysics. Four cases of reduction arise; three cases of
specific values of the measure of the anisotropy variation, and one general
case, which we postulate as a specific relationship between the two
gravitational potentials.... | [
{
"created": "Thu, 18 May 2023 10:37:01 GMT",
"version": "v1"
}
] | 2023-05-19 | [
[
"Khan",
"Muhammad Al-Zafar",
""
],
[
"Narain",
"Riven",
""
]
] | We derive the Lie point symmetries for the MIT Bag Model for quark stars in relativistic astrophysics. Four cases of reduction arise; three cases of specific values of the measure of the anisotropy variation, and one general case, which we postulate as a specific relationship between the two gravitational potentials. W... |
gr-qc/0211059 | Zoltan Perjes | Zolt\'an Perj\'es | Perturbations of rotating cosmological black holes | 8 pages, submitted to CQG | null | null | null | gr-qc | null | Charged, rotating black hole solutions of Einstein's gravitational equations
are investigated in the presence of a cosmological constant. A pair of wave
equations governing the electromagnetic and gravitational perturbations are
derived.
| [
{
"created": "Mon, 18 Nov 2002 13:35:12 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Nov 2002 08:53:00 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Perjés",
"Zoltán",
""
]
] | Charged, rotating black hole solutions of Einstein's gravitational equations are investigated in the presence of a cosmological constant. A pair of wave equations governing the electromagnetic and gravitational perturbations are derived. |
gr-qc/0609030 | Joel Franklin | S. Deser | A Comment on hep-th/0608078 | null | null | null | null | gr-qc hep-th | null | The above hep-th posting purports -- erroneously -- to be a comment on a Note
by me in gr-qc.
| [
{
"created": "Thu, 7 Sep 2006 20:57:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Deser",
"S.",
""
]
] | The above hep-th posting purports -- erroneously -- to be a comment on a Note by me in gr-qc. |
1511.06962 | B. S. Ratanpal | Piyali Bhar and B. S. Ratanpal | A New Anisotropic Compact Star Model having Matese \& Whitman Mass
Function | 14 pages, 2 tables and 12 figures, communicated in IJMPD | Astrophys Space Sci (2016) 361:217 | 10.1007/s10509-016-2811-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new singularity free model of anisotroipic compact star is proposed. The
Einstein field equations are solved in closed form by utilizing Matese \&
Whitman mass function. The model parameters $\rho$, $p_r$ and $p_t$ all are
well behaved inside the stellar interior and our model satisfies all the
required conditions ... | [
{
"created": "Sun, 22 Nov 2015 04:35:40 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 2016 09:45:25 GMT",
"version": "v2"
}
] | 2016-11-01 | [
[
"Bhar",
"Piyali",
""
],
[
"Ratanpal",
"B. S.",
""
]
] | A new singularity free model of anisotroipic compact star is proposed. The Einstein field equations are solved in closed form by utilizing Matese \& Whitman mass function. The model parameters $\rho$, $p_r$ and $p_t$ all are well behaved inside the stellar interior and our model satisfies all the required conditions to... |
1807.00335 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou, S. Banerjee | Dynamics of Inflation and Dark Energy from $F(R, \mathcal{G})$ Gravity | null | null | 10.1016/j.nuclphysb.2018.07.013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study certain classes of $F(R,{\cal G})$ gravity which have
appealing phenomenological features, with respect to the successful realization
of the dark energy and of the inflationary era. Particularly, we discuss the
general formalism and we demonstrate how several inflationary and dark energy
evoluti... | [
{
"created": "Sun, 1 Jul 2018 14:36:47 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Banerjee",
"S.",
""
]
] | In this work we study certain classes of $F(R,{\cal G})$ gravity which have appealing phenomenological features, with respect to the successful realization of the dark energy and of the inflationary era. Particularly, we discuss the general formalism and we demonstrate how several inflationary and dark energy evolution... |
2211.00027 | Manuel R. Izquierdo | Manuel R. Izquierdo, Lorenzo Pareschi, Borja Mi\~nano, Joan Mass\'o,
Carlos Palenzuela | Global high-order numerical schemes for the time evolution of the
general relativistic radiation magneto-hydrodynamics equations | 18 + 6. Updated manuscript matching published version + additional
appendix "Comparing the convergence order of IMEX and semi-implicit schemes" | null | 10.1088/1361-6382/acd97f | null | gr-qc astro-ph.HE cs.NA math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modeling correctly the transport of neutrinos is crucial in some
astrophysical scenarios such as core-collapse supernovae and binary neutron
star mergers. In this paper, we focus on the truncated-moment formalism,
considering only the first two moments (M1 scheme) within the grey
approximation, which reduces Boltzman... | [
{
"created": "Mon, 31 Oct 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2023 14:47:18 GMT",
"version": "v2"
}
] | 2023-05-30 | [
[
"Izquierdo",
"Manuel R.",
""
],
[
"Pareschi",
"Lorenzo",
""
],
[
"Miñano",
"Borja",
""
],
[
"Massó",
"Joan",
""
],
[
"Palenzuela",
"Carlos",
""
]
] | Modeling correctly the transport of neutrinos is crucial in some astrophysical scenarios such as core-collapse supernovae and binary neutron star mergers. In this paper, we focus on the truncated-moment formalism, considering only the first two moments (M1 scheme) within the grey approximation, which reduces Boltzmann ... |
1307.4064 | Barak Kol | Barak Kol | Self force from equivalent periodic sources | 18 pages, 1 figure. v2: Sharpening of the periodic decomposition | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the self force and radiation due to a small body in orbit
(especially aperiodic) around a black hole, this paper defines a decomposition
of the source into a sum over the shape preserving periodic motions of extended
objects defined here consisting of ensembles of freely falling point particles.
The stati... | [
{
"created": "Mon, 15 Jul 2013 19:29:13 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2013 10:02:28 GMT",
"version": "v2"
}
] | 2013-08-02 | [
[
"Kol",
"Barak",
""
]
] | Considering the self force and radiation due to a small body in orbit (especially aperiodic) around a black hole, this paper defines a decomposition of the source into a sum over the shape preserving periodic motions of extended objects defined here consisting of ensembles of freely falling point particles. The station... |
1801.09964 | Isha Kotecha | Isha Kotecha and Daniele Oriti | Statistical Equilibrium in Quantum Gravity: Gibbs states in Group Field
Theory | v2 31 pages; typos corrected; section 2 modified substantially for
clarity; minor modifications in the abstract and introduction; arguments and
results unchanged | 2018 New J. Phys. 20, 073009 | 10.1088/1367-2630/aacbbd | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gibbs states are known to play a crucial role in the statistical description
of a system with a large number of degrees of freedom. They are expected to be
vital also in a quantum gravitational system with many underlying fundamental
discrete degrees of freedom. However, due to the absence of well-defined
concepts of... | [
{
"created": "Tue, 30 Jan 2018 12:46:48 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jun 2018 17:46:51 GMT",
"version": "v2"
}
] | 2018-07-05 | [
[
"Kotecha",
"Isha",
""
],
[
"Oriti",
"Daniele",
""
]
] | Gibbs states are known to play a crucial role in the statistical description of a system with a large number of degrees of freedom. They are expected to be vital also in a quantum gravitational system with many underlying fundamental discrete degrees of freedom. However, due to the absence of well-defined concepts of t... |
1608.00591 | Javad Taghizadeh Firouzjaee | Alireza Allahyari, Javad T. Firouzjaee and Ali Akbar Abolhasani | Primordial black holes in linear and non-linear regimes | 14 pages, 1 figure | null | 10.1088/1475-7516/2017/06/041 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Using the concept of apparent horizon for dynamical black holes, we revisit
the formation of primordial black holes (PBH) in the early universe for both
linear and non-linear regimes. First, we develop the perturbation theory for
spherically symmetric spacetimes to study the formation of spherical PBHs in
linear regi... | [
{
"created": "Mon, 1 Aug 2016 20:00:40 GMT",
"version": "v1"
}
] | 2017-06-28 | [
[
"Allahyari",
"Alireza",
""
],
[
"Firouzjaee",
"Javad T.",
""
],
[
"Abolhasani",
"Ali Akbar",
""
]
] | Using the concept of apparent horizon for dynamical black holes, we revisit the formation of primordial black holes (PBH) in the early universe for both linear and non-linear regimes. First, we develop the perturbation theory for spherically symmetric spacetimes to study the formation of spherical PBHs in linear regime... |
0804.0054 | Lucien Hardy | Lucien Hardy | Formalism Locality in Quantum Theory and Quantum Gravity | To appear in "Philosophy of Quantum Information and Entanglement" Eds
A. Bokulich and G. Jaeger (CUP) | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We expect a theory of Quantum Gravity to be both probabilistic and have
indefinite causal structure. Indefinite causal structure poses particular
problems for theory formulation since many of the core ideas used in the usual
approaches to theory construction depend on having definite causal structure.
For example, th... | [
{
"created": "Tue, 1 Apr 2008 01:49:35 GMT",
"version": "v1"
}
] | 2008-04-02 | [
[
"Hardy",
"Lucien",
""
]
] | We expect a theory of Quantum Gravity to be both probabilistic and have indefinite causal structure. Indefinite causal structure poses particular problems for theory formulation since many of the core ideas used in the usual approaches to theory construction depend on having definite causal structure. For example, the ... |
0804.0332 | Edward Porter | Edward K. Porter, Neil J. Cornish | The Effect of Higher Harmonic Corrections on the Detection of massive
black hole binaries with LISA | 15 pages, 8 figures, submitted to PRD | Phys.Rev.D78:064005,2008 | 10.1103/PhysRevD.78.064005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Massive black hole binaries are key targets for the space based gravitational
wave interferometer LISA. Several studies have investigated how LISA
observations could be used to constrain the parameters of these systems. Until
recently, most of these studies have ignored the higher harmonic corrections to
the waveform... | [
{
"created": "Wed, 2 Apr 2008 11:24:19 GMT",
"version": "v1"
}
] | 2009-02-20 | [
[
"Porter",
"Edward K.",
""
],
[
"Cornish",
"Neil J.",
""
]
] | Massive black hole binaries are key targets for the space based gravitational wave interferometer LISA. Several studies have investigated how LISA observations could be used to constrain the parameters of these systems. Until recently, most of these studies have ignored the higher harmonic corrections to the waveforms.... |
1909.10949 | Kuantay Boshkayev | K. Boshkayev, H. Quevedo, G. Nurbakyt, A. Malybayev and A. Urazalina | The Erez-Rosen solution versus the Hartle-Thorne solution | Accepted for publication. 8 pages | Symmetry 2019, 11(10), 1324; https://doi.org/10.3390/sym11101324
(registering DOI) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the correspondence between the Erez-Rosen and
Hartle-Thorne solutions. We explicitly show how to establish the relationship
and find the coordinate transformations between the two metrics. For this
purpose the two metrics must have the same approximation and describe the
gravitational fie... | [
{
"created": "Tue, 24 Sep 2019 14:21:22 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Oct 2019 18:03:24 GMT",
"version": "v2"
}
] | 2019-10-24 | [
[
"Boshkayev",
"K.",
""
],
[
"Quevedo",
"H.",
""
],
[
"Nurbakyt",
"G.",
""
],
[
"Malybayev",
"A.",
""
],
[
"Urazalina",
"A.",
""
]
] | In this work, we investigate the correspondence between the Erez-Rosen and Hartle-Thorne solutions. We explicitly show how to establish the relationship and find the coordinate transformations between the two metrics. For this purpose the two metrics must have the same approximation and describe the gravitational field... |
gr-qc/9705038 | N. K. Dadhich | Naresh Dadhich | Inhomogeneous imperfect fluid spherical models without Big-Bang
singularity | 8 pages, LaTeX version | J.Astrophys.Astron. 18 (1997) 343 | 10.1007/BF02709325 | IUCAA-40/97 | gr-qc | null | So far all known singularity-free cosmological models are cylindrically
symmetric. Here we present a new family of spherically symmetric non-singular
models filled with imperfect fluid and radial heat flow, and satisfying the
weak and strong energy conditions. For large $t$ anisotropy in pressure and
heat flux tend t... | [
{
"created": "Wed, 14 May 1997 07:58:35 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Dadhich",
"Naresh",
""
]
] | So far all known singularity-free cosmological models are cylindrically symmetric. Here we present a new family of spherically symmetric non-singular models filled with imperfect fluid and radial heat flow, and satisfying the weak and strong energy conditions. For large $t$ anisotropy in pressure and heat flux tend to ... |
1701.00192 | Cosimo Bambi | Tianling Shen, Menglei Zhou, Cosimo Bambi, Carlos A.R. Herdeiro, Eugen
Radu | Iron K$\alpha$ line of Proca stars | 6 pages, 3 figures | JCAP 1708:014 (2017) | 10.1088/1475-7516/2017/08/014 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | X-ray reflection spectroscopy can be a powerful tool to test the nature of
astrophysical black holes. Extending previous work on Kerr black holes with
scalar hair [1] and on boson stars [2], here we study whether astrophysical
black hole candidates may be horizonless, self-gravitating, vector
Bose-Einstein condensate... | [
{
"created": "Sun, 1 Jan 2017 04:16:41 GMT",
"version": "v1"
}
] | 2017-08-14 | [
[
"Shen",
"Tianling",
""
],
[
"Zhou",
"Menglei",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Radu",
"Eugen",
""
]
] | X-ray reflection spectroscopy can be a powerful tool to test the nature of astrophysical black holes. Extending previous work on Kerr black holes with scalar hair [1] and on boson stars [2], here we study whether astrophysical black hole candidates may be horizonless, self-gravitating, vector Bose-Einstein condensates,... |
gr-qc/0001060 | Sergiu Vacaru | Sergiu I. Vacaru | Locally Anisotropic Kinetic Processes and Thermodynamics in Curved
Spaces | version 2, 46 pages, latex 209, minor changes, accepted to Annals of
Physics (NY) | AnnalsPhys.290:83-123,2001 | 10.1006/aphy.2000.6121 | null | gr-qc astro-ph hep-ph hep-th | null | The kinetic theory is formulated with respect to anholonomic frames of
reference on curved spacetimes. By using the concept of nonlinear connection we
develop an approach to modelling locally anisotropic kinetic processes and, in
corresponding limits, the relativistic non-equilibrium thermodynamics with
local anisotr... | [
{
"created": "Thu, 20 Jan 2000 12:51:56 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Oct 2000 07:39:37 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Nov 2000 11:53:01 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Vacaru",
"Sergiu I.",
""
]
] | The kinetic theory is formulated with respect to anholonomic frames of reference on curved spacetimes. By using the concept of nonlinear connection we develop an approach to modelling locally anisotropic kinetic processes and, in corresponding limits, the relativistic non-equilibrium thermodynamics with local anisotrop... |
gr-qc/0205017 | Igor O. Cherednikov | Igor O.Cherednikov | Cosmological Constant and Zeta-Function | Several errors and misprints corrected, the discussion extended. 6
pages, LaTeX | null | null | null | gr-qc | null | The relativistic invariant zeta-function approach to computation of the
vacuum energy contribution to cosmological constant is discussed. It is shown
that this value is determined by the fourth power of the quantized field mass,
while the dependence from the large mass scale is only logarithmic. This value
is compare... | [
{
"created": "Sat, 4 May 2002 18:13:20 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Nov 2002 11:58:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cherednikov",
"Igor O.",
""
]
] | The relativistic invariant zeta-function approach to computation of the vacuum energy contribution to cosmological constant is discussed. It is shown that this value is determined by the fourth power of the quantized field mass, while the dependence from the large mass scale is only logarithmic. This value is compared ... |
1908.11206 | Sayan K Pal | Sayan K Pal, Partha Nandi | Effect of dynamical noncommutativity on the limiting mass of white
dwarfs | 7 pages | Physics Letters B797 (2019) 134859 | 10.1016/j.physletb.2019.134859 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of the existence of an upper bound on the mass of a white dwarf
star is considered as one of the finest of twentieth century astrophysics. On
approaching this limiting mass of $1.4M_\odot$, known as the Chandrasekhar
mass-limit, a white dwarf is believed to spark of with an explosion called type
Ia supe... | [
{
"created": "Tue, 27 Aug 2019 18:29:02 GMT",
"version": "v1"
}
] | 2019-08-30 | [
[
"Pal",
"Sayan K",
""
],
[
"Nandi",
"Partha",
""
]
] | The discovery of the existence of an upper bound on the mass of a white dwarf star is considered as one of the finest of twentieth century astrophysics. On approaching this limiting mass of $1.4M_\odot$, known as the Chandrasekhar mass-limit, a white dwarf is believed to spark of with an explosion called type Ia supern... |
2408.05262 | Jorge Delgado | Jorge F. M. Delgado, Juan Carlos Degollado, Luis E. Mart\'inez,
Marcelo Salgado | Slowly Rotating Boson Stars | 21 pages, 12 figures | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We present solutions to the Einstein-Klein Gordon system representing boson
stars in the slow rotation approximation. By considering slow rotation we are
able to reduce the number of equations yielding a system of ordinary
differential equations that is conveniently solved numerically without the need
of expensive co... | [
{
"created": "Fri, 9 Aug 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Delgado",
"Jorge F. M.",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Martínez",
"Luis E.",
""
],
[
"Salgado",
"Marcelo",
""
]
] | We present solutions to the Einstein-Klein Gordon system representing boson stars in the slow rotation approximation. By considering slow rotation we are able to reduce the number of equations yielding a system of ordinary differential equations that is conveniently solved numerically without the need of expensive comp... |
gr-qc/0501082 | Gabriele Gionti S. J. | Gabriele Gionti | Discrete Gravity as a Local Theory of the Poincar\'e Group in the First
Order Formalism | Revised version, 18 pages, 2 figures, accepted by Classical and
Quantum Gravity | Class.Quant.Grav. 22 (2005) 4217-4230 | 10.1088/0264-9381/22/20/004 | null | gr-qc hep-lat hep-th | null | A discrete theory of gravity locally invariant under the Poincar\'e group is
considered as in a companion paper. We define a first order theory, in the
sense of Palatini, on the metric-dual Voronoi complex of a simplicial complex.
We follow the same spirit of the continuum theory of General Relativity in the
Cartan f... | [
{
"created": "Wed, 26 Jan 2005 21:01:33 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2005 16:07:17 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Gionti",
"Gabriele",
""
]
] | A discrete theory of gravity locally invariant under the Poincar\'e group is considered as in a companion paper. We define a first order theory, in the sense of Palatini, on the metric-dual Voronoi complex of a simplicial complex. We follow the same spirit of the continuum theory of General Relativity in the Cartan for... |
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