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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0907.4647 | Wlodzimierz Piechocki | Przemyslaw Malkiewicz and Wlodzimierz Piechocki | Foamy structure of spacetime | 5 pages, no figures, improved version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine spectrum of the physical volume operator within the non-standard
loop quantum cosmology. The spectrum is discrete with equally distant levels
defining a quantum of the volume. The discreteness may imply a foamy structure
of spacetime at semi-classical level which may be detected in astro-cosmo
observations... | [
{
"created": "Mon, 27 Jul 2009 15:02:22 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 2009 13:40:10 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Oct 2009 11:17:16 GMT",
"version": "v3"
}
] | 2009-10-26 | [
[
"Malkiewicz",
"Przemyslaw",
""
],
[
"Piechocki",
"Wlodzimierz",
""
]
] | We examine spectrum of the physical volume operator within the non-standard loop quantum cosmology. The spectrum is discrete with equally distant levels defining a quantum of the volume. The discreteness may imply a foamy structure of spacetime at semi-classical level which may be detected in astro-cosmo observations. |
0912.0643 | Ernesto Nungesser | Ernesto Nungesser | Polarized Electrogowdy spacetimes censored | 6 pages, submitted to the conference proceedings of "Spanish
relativity meeting 2009" | J.Phys.Conf.Ser.229:012057,2010 | 10.1088/1742-6596/229/1/012057 | AEI-2009-118 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A sketch of the proof of strong cosmic censorship is presented for a class of
solutions of the Einstein-Maxwell equations, those with polarized Gowdy
symmetry. A key element of the argument is the observation that by means of a
suitable choice of variables the central equations in this problem can be
written in a for... | [
{
"created": "Thu, 3 Dec 2009 12:47:38 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Nungesser",
"Ernesto",
""
]
] | A sketch of the proof of strong cosmic censorship is presented for a class of solutions of the Einstein-Maxwell equations, those with polarized Gowdy symmetry. A key element of the argument is the observation that by means of a suitable choice of variables the central equations in this problem can be written in a form ... |
1611.08808 | Chandrachur Chakraborty | Chandrachur Chakraborty, Prashant Kocherlakota, Mandar Patil, Sudip
Bhattacharyya, Pankaj S. Joshi, Andrzej Kr\'olak | Distinguishing Kerr naked singularities and black holes using the spin
precession of a test gyro in strong gravitational fields | LaTex; 26 pages including 51 figures, thoroughly revised version, new
sections and new references added, results and conclusions remain unchanged,
accepted for publication in PRD | Phys. Rev. D 95, 084024 (2017) | 10.1103/PhysRevD.95.084024 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study here the precession of the spin of a test gyroscope attached to a
stationary observer in the Kerr spacetime, specifically, to distinguish naked
singularity (NS) from black hole (BH). It was shown recently that for gyros
attached to static observers, their precession frequency became arbitrarily
large in the ... | [
{
"created": "Sun, 27 Nov 2016 08:43:29 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 2017 14:03:06 GMT",
"version": "v2"
}
] | 2017-04-14 | [
[
"Chakraborty",
"Chandrachur",
""
],
[
"Kocherlakota",
"Prashant",
""
],
[
"Patil",
"Mandar",
""
],
[
"Bhattacharyya",
"Sudip",
""
],
[
"Joshi",
"Pankaj S.",
""
],
[
"Królak",
"Andrzej",
""
]
] | We study here the precession of the spin of a test gyroscope attached to a stationary observer in the Kerr spacetime, specifically, to distinguish naked singularity (NS) from black hole (BH). It was shown recently that for gyros attached to static observers, their precession frequency became arbitrarily large in the li... |
gr-qc/0207038 | Martin Bojowald | Martin Bojowald and Franz Hinterleitner | Isotropic Loop Quantum Cosmology with Matter | 18 pages, 4 figures | Phys.Rev. D66 (2002) 104003 | 10.1103/PhysRevD.66.104003 | CGPG-02/7-1 | gr-qc | null | A free massless scalar field is coupled to homogeneous and isotropic loop
quantum cosmology. The coupled model is investigated in the vicinity of the
classical singularity, where discreteness is essential and where the quantum
model is non-singular, as well as in the regime of large volumes, where it
displays the exp... | [
{
"created": "Mon, 8 Jul 2002 17:13:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bojowald",
"Martin",
""
],
[
"Hinterleitner",
"Franz",
""
]
] | A free massless scalar field is coupled to homogeneous and isotropic loop quantum cosmology. The coupled model is investigated in the vicinity of the classical singularity, where discreteness is essential and where the quantum model is non-singular, as well as in the regime of large volumes, where it displays the expec... |
2104.06105 | Pedro Mario Ca\~nate Casseres | Pedro Ca\~nate, Joseph Sultana, Demosthenes Kazanas | Gravitational analog of the canonical acoustic black hole in
Einstein-scalar-Gauss-Bonnet theory | 12 pages, 7 figures | null | 10.1088/1361-6382/abf97f | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, in the context of modified gravity, a curved spacetime
analogous to the "canonical acoustic black hole" is constructed. The source is
a self-interacting scalar field which is non-minimally coupled to gravity
through the Gauss-Bonnet invariant. The scalar-Gauss-Bonnet coupling function
is characterized b... | [
{
"created": "Tue, 13 Apr 2021 11:21:39 GMT",
"version": "v1"
}
] | 2021-06-09 | [
[
"Cañate",
"Pedro",
""
],
[
"Sultana",
"Joseph",
""
],
[
"Kazanas",
"Demosthenes",
""
]
] | In this work, in the context of modified gravity, a curved spacetime analogous to the "canonical acoustic black hole" is constructed. The source is a self-interacting scalar field which is non-minimally coupled to gravity through the Gauss-Bonnet invariant. The scalar-Gauss-Bonnet coupling function is characterized by ... |
2112.08528 | Pietropaolo Frisoni | Pietropaolo Frisoni | Studying the EPRL spinfoam self-energy | 19 pages, contribution to the Proceedings of the 16th Marcel
Grossmann Meeting (MG16 - July 2021) | null | 10.1142/9789811269776_0336 | null | gr-qc hep-th physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | I present some recent progresses in the study of the EPRL self-energy
amplitude. New numerical methods allow to analyze how the divergence scales,
for which previous works provided very different lower and upper bounds. I show
the role that the Immirzi parameter plays in the asymptotic behavior, and I
discuss the dyn... | [
{
"created": "Wed, 15 Dec 2021 23:32:32 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Dec 2021 17:42:44 GMT",
"version": "v2"
}
] | 2023-01-27 | [
[
"Frisoni",
"Pietropaolo",
""
]
] | I present some recent progresses in the study of the EPRL self-energy amplitude. New numerical methods allow to analyze how the divergence scales, for which previous works provided very different lower and upper bounds. I show the role that the Immirzi parameter plays in the asymptotic behavior, and I discuss the dynam... |
1511.04955 | Elizabeth Winstanley | J. Erik Baxter and Elizabeth Winstanley | Topological black holes in ${\mathfrak {su}}(N)$ Einstein-Yang-Mills
theory with a negative cosmological constant | 7 pages, 3 figures, minor changes, references added, matches
published version | null | 10.1016/j.physletb.2015.12.023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the phase space of topological black hole solutions of
${\mathfrak {su}}(N)$ Einstein-Yang-Mills theory in anti-de Sitter space with a
purely magnetic gauge potential. The gauge field is described by $N-1$ magnetic
gauge field functions $\omega_{j}$, $j=1,\ldots , N-1$. For ${\mathfrak
{su}}(2)$ gauge ... | [
{
"created": "Mon, 16 Nov 2015 13:44:12 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jan 2016 17:29:07 GMT",
"version": "v2"
}
] | 2016-01-08 | [
[
"Baxter",
"J. Erik",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | We investigate the phase space of topological black hole solutions of ${\mathfrak {su}}(N)$ Einstein-Yang-Mills theory in anti-de Sitter space with a purely magnetic gauge potential. The gauge field is described by $N-1$ magnetic gauge field functions $\omega_{j}$, $j=1,\ldots , N-1$. For ${\mathfrak {su}}(2)$ gauge gr... |
1408.3419 | Yurii Ignatyev | Yu.G. Ignatyev, A.A. Agathonov and D.Yu. Ignatyev | Statistical system with fantom scalar interaction. II. Macroscopic
Equations and Cosmological Models | 10 pages, 11 references | null | 10.1134/S0202289314040070 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the proposed earlier by the Author approach to macroscopic
description of scalar interaction, this paper develops the macroscopic model of
relativistic plasma with a fantom scalar interaction of elementary particles.
In the article the macroscopic equations for a statistical system with scalar
interaction of... | [
{
"created": "Thu, 14 Aug 2014 20:00:19 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Ignatyev",
"Yu. G.",
""
],
[
"Agathonov",
"A. A.",
""
],
[
"Ignatyev",
"D. Yu.",
""
]
] | Based on the proposed earlier by the Author approach to macroscopic description of scalar interaction, this paper develops the macroscopic model of relativistic plasma with a fantom scalar interaction of elementary particles. In the article the macroscopic equations for a statistical system with scalar interaction of p... |
0909.0351 | Kourosh Nozari | Kourosh Nozari and Tahereh Azizi | Phantom-Like Behavior in $f(R)$-Gravity | 14 pages, Revised Version, To appear in PLB | Phys.Lett.B680:205-211,2009 | 10.1016/j.physletb.2009.08.066 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate possible realization of the phantom-like behavior in the
framework of $f(R)$-gravity models where there are no phantom fields in the
matter sector of the theory. By adopting some observationally reliable ansatz
for $f(R)$, we show that it is possible to realize phantom-like behavior in
$f(R)$-gravity w... | [
{
"created": "Wed, 2 Sep 2009 08:47:03 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Sep 2009 08:04:16 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Nozari",
"Kourosh",
""
],
[
"Azizi",
"Tahereh",
""
]
] | We investigate possible realization of the phantom-like behavior in the framework of $f(R)$-gravity models where there are no phantom fields in the matter sector of the theory. By adopting some observationally reliable ansatz for $f(R)$, we show that it is possible to realize phantom-like behavior in $f(R)$-gravity wit... |
0903.1404 | Gamal G.L. Nashed | Gamal Gergess Lamee Nashed | Self-dual Lorentzian Wormholes and Energy in Teleparallel Theory of
Gravity | 13 pages, LaTex,. Will appear in Gravitation and Cosmology | Grav.Cosmol.15:256-262,2009 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two spherically symmetric, static Lorentzian wormholes are obtained in tetrad
theory of gravitation as a solution of the equation $\rho=\rho_t=0$, where
$\rho=T_{ij}u^iu^j, \rho_t=(T_{ij}-{1/2}Tg_{ij})u^iu^j$ and $u^iu_i=-1$. This
equation characterizes a class of spacetime which are "self-dual" (in the sense
of elec... | [
{
"created": "Sun, 8 Mar 2009 10:40:03 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2009 09:12:46 GMT",
"version": "v2"
}
] | 2009-09-24 | [
[
"Nashed",
"Gamal Gergess Lamee",
""
]
] | Two spherically symmetric, static Lorentzian wormholes are obtained in tetrad theory of gravitation as a solution of the equation $\rho=\rho_t=0$, where $\rho=T_{ij}u^iu^j, \rho_t=(T_{ij}-{1/2}Tg_{ij})u^iu^j$ and $u^iu_i=-1$. This equation characterizes a class of spacetime which are "self-dual" (in the sense of electr... |
gr-qc/9512016 | Vitorio Alberto De Lorenci | M. Novello, L. R. Freitas and V. A. De Lorenci | The Static Gravitational Field of a Spherically Symmetric Body | 15 pagex, LateX | null | null | LAFEX-95-MN2 | gr-qc | null | We continue here the exam \cite{LuMa} of a theory of gravity that satisfies
the Einstein Equivalence Principle (EEP) for any kind of matter/energy, except
for the gravitational energy. This is part of a research program that intends
to re-examine the standard Feynman-Deser approach of field theoretical
derivation of ... | [
{
"created": "Thu, 7 Dec 1995 22:26:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Novello",
"M.",
""
],
[
"Freitas",
"L. R.",
""
],
[
"De Lorenci",
"V. A.",
""
]
] | We continue here the exam \cite{LuMa} of a theory of gravity that satisfies the Einstein Equivalence Principle (EEP) for any kind of matter/energy, except for the gravitational energy. This is part of a research program that intends to re-examine the standard Feynman-Deser approach of field theoretical derivation of Ei... |
1801.01083 | Eloisa Bentivegna | Eloisa Bentivegna, Timothy Clifton, Jessie Durk, Miko{\l}aj
Korzy\'nski, Kjell Rosquist | Black-Hole Lattices as Cosmological Models | 54 pages, 16 figures, review prepared for the CQG Special Focus Issue
"Computational issues in mathematical cosmology" | null | 10.1088/1361-6382/aac846 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for solutions of Einstein's equations representing relativistic
cosmological models with a discrete matter content has been remarkably fruitful
in the last decade. In this review we discuss the progress made in the study of
a specific subclass of discrete cosmologies, Black-Hole Lattice models. In
particul... | [
{
"created": "Wed, 3 Jan 2018 17:08:08 GMT",
"version": "v1"
}
] | 2018-08-08 | [
[
"Bentivegna",
"Eloisa",
""
],
[
"Clifton",
"Timothy",
""
],
[
"Durk",
"Jessie",
""
],
[
"Korzyński",
"Mikołaj",
""
],
[
"Rosquist",
"Kjell",
""
]
] | The search for solutions of Einstein's equations representing relativistic cosmological models with a discrete matter content has been remarkably fruitful in the last decade. In this review we discuss the progress made in the study of a specific subclass of discrete cosmologies, Black-Hole Lattice models. In particular... |
2209.01867 | Aaron Held | Aaron Held and Jun Zhang | Instability of spherically-symmetric black holes in Quadratic Gravity | 10 pages, 4 figures + appendix and references | null | 10.1103/PhysRevD.107.064060 | Imperial/TP/2022/AH/03 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the linear stability of the two known branches of
spherically-symmetric black holes in Quadratic Gravity. We extend previous work
on the long-wavelength (Gregory-Laflamme) instability of the Schwarzschild
branch to a corresponding long-wavelength instability in the non-Schwarzschild
branch. In both cas... | [
{
"created": "Mon, 5 Sep 2022 09:56:16 GMT",
"version": "v1"
}
] | 2023-04-05 | [
[
"Held",
"Aaron",
""
],
[
"Zhang",
"Jun",
""
]
] | We investigate the linear stability of the two known branches of spherically-symmetric black holes in Quadratic Gravity. We extend previous work on the long-wavelength (Gregory-Laflamme) instability of the Schwarzschild branch to a corresponding long-wavelength instability in the non-Schwarzschild branch. In both cases... |
1011.5676 | Elena Magliaro | Elena Magliaro, Antonino Marciano, Claudio Perini | Coherent states for FLRW space-times in loop quantum gravity | 10 pages, 1 figure, published version | Phys.Rev.D83:044029,2011 | 10.1103/PhysRevD.83.044029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a class of coherent spin-network states that capture proprieties
of curved space-times of the Friedmann-Lama\^itre-Robertson-Walker type on
which they are peaked. The data coded by a coherent state are associated to a
cellular decomposition of a spatial ($t=$const.) section with dual graph given
by the c... | [
{
"created": "Thu, 25 Nov 2010 19:29:17 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jan 2011 16:25:14 GMT",
"version": "v2"
}
] | 2011-02-22 | [
[
"Magliaro",
"Elena",
""
],
[
"Marciano",
"Antonino",
""
],
[
"Perini",
"Claudio",
""
]
] | We construct a class of coherent spin-network states that capture proprieties of curved space-times of the Friedmann-Lama\^itre-Robertson-Walker type on which they are peaked. The data coded by a coherent state are associated to a cellular decomposition of a spatial ($t=$const.) section with dual graph given by the com... |
gr-qc/0006046 | Peter Forgacs | P. Breitenlohner, P. Forg\'acs, D. Maison | Static Cosmological Solutions of the Einstein-Yang-Mills-Higgs Equations | 7 pages, 5 figures, LaTex | Phys.Lett.B489:397-402,2000 | 10.1016/S0370-2693(00)00931-X | null | gr-qc | null | Numerical evidence is presented for the existence of a new family of static,
globally regular `cosmological' solutions of the spherically symmetric
Einstein-Yang-Mills-Higgs equations. These solutions are characterized by two
natural numbers ($m\geq 1$, $n\geq 0$), the number of nodes of the Yang-Mills
and Higgs fiel... | [
{
"created": "Tue, 13 Jun 2000 12:43:55 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Breitenlohner",
"P.",
""
],
[
"Forgács",
"P.",
""
],
[
"Maison",
"D.",
""
]
] | Numerical evidence is presented for the existence of a new family of static, globally regular `cosmological' solutions of the spherically symmetric Einstein-Yang-Mills-Higgs equations. These solutions are characterized by two natural numbers ($m\geq 1$, $n\geq 0$), the number of nodes of the Yang-Mills and Higgs field ... |
0908.1654 | Aur\'elien Hees | A. Hees, S. Pireaux | A Relativistic Motion Integrator: Numerical accuracy and illustration
with BepiColombo and Mars-NEXT | 3 pages, 7 figures, submitted to IAU proceedings symposium 261 | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Today, the motion of spacecraft is still described by the classical Newtonian
equations of motion plus some relativistic corrections. This approach might
become cumbersome due to the increasing precision required. We use the
Relativistic Motion Integrator (RMI) approach to numerically integrate the
native relativisti... | [
{
"created": "Wed, 12 Aug 2009 09:40:11 GMT",
"version": "v1"
}
] | 2009-08-14 | [
[
"Hees",
"A.",
""
],
[
"Pireaux",
"S.",
""
]
] | Today, the motion of spacecraft is still described by the classical Newtonian equations of motion plus some relativistic corrections. This approach might become cumbersome due to the increasing precision required. We use the Relativistic Motion Integrator (RMI) approach to numerically integrate the native relativistic ... |
2112.04496 | Hilberto M. R. Da Silva | Tiberiu Harko, Francisco S. N. Lobo, Hilberto Silva | $U(1)$ local strings in hybrid metric-Palatini gravity | Submitted to the proceeding of the 16th Marcel Grossmann meeting.
Based on the article arXiv:2003.09751 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work we made use of a general static cillindrically symmetric metric
to find $U(1)$ local cosmic string solutions in the context of the hybrid
metric-Palatini theory of gravity in it's scalar-tensor representation. After
finding the dynamical equations for this particular case, we imposed boost
invariance alo... | [
{
"created": "Wed, 8 Dec 2021 15:27:39 GMT",
"version": "v1"
}
] | 2021-12-10 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Silva",
"Hilberto",
""
]
] | In this work we made use of a general static cillindrically symmetric metric to find $U(1)$ local cosmic string solutions in the context of the hybrid metric-Palatini theory of gravity in it's scalar-tensor representation. After finding the dynamical equations for this particular case, we imposed boost invariance along... |
gr-qc/0005091 | Grigori Volovik | G.E. Volovik | Superfluid analogies of cosmological phenomena | draft of review for Physics Reports, RevTex file, 113 pages, 26
figures; new sections and references are added | Phys.Rept. 351 (2001) 195-348 | 10.1016/S0370-1573(00)00139-3 | null | gr-qc cond-mat hep-ph | null | Superfluid 3He-A gives example of how chirality, Weyl fermions, gauge fields
and gravity appear in low energy corner together with corresponding symmetries,
including Lorentz symmetry and local SU(N). This supports idea that quantum
field theory (Standard Model or GUT) is effective theory describing low-energy
phenom... | [
{
"created": "Sun, 21 May 2000 10:01:10 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Aug 2000 15:45:18 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Oct 2000 16:34:22 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Volovik",
"G. E.",
""
]
] | Superfluid 3He-A gives example of how chirality, Weyl fermions, gauge fields and gravity appear in low energy corner together with corresponding symmetries, including Lorentz symmetry and local SU(N). This supports idea that quantum field theory (Standard Model or GUT) is effective theory describing low-energy phenomen... |
2009.13451 | A. Hujeirat | A.A Hujeirat | Why the spacetime embedding incompressible supradense nuclear matter is
conformally flat? | 4 pages, 2 figures | null | 10.4236/jmp.2020.1111110 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The multi-messenger observations of the merger event in GW170817 did not rule
out the possibility that the remnant might be a dynamically stable neutron star
with $\mathcal{M}_{rm}\geq 2.69 \,\mathcal{M}_{\odot}.$ Based on this and other
recent events, I argue that the universal maximum density hypothesis should be
r... | [
{
"created": "Mon, 28 Sep 2020 16:19:52 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2020 06:37:45 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Oct 2020 13:01:24 GMT",
"version": "v3"
}
] | 2020-12-02 | [
[
"Hujeirat",
"A. A",
""
]
] | The multi-messenger observations of the merger event in GW170817 did not rule out the possibility that the remnant might be a dynamically stable neutron star with $\mathcal{M}_{rm}\geq 2.69 \,\mathcal{M}_{\odot}.$ Based on this and other recent events, I argue that the universal maximum density hypothesis should be rev... |
2104.04634 | Mitja Fridman | Saurya Das and Mitja Fridman | Test of Quantum Gravity in Statistical Mechanics | 26 pages, 5 figures | Phys. Rev. D 104, 026014 (2021) | 10.1103/PhysRevD.104.026014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Quantum Gravity effects on the density of states in statistical
mechanics and its implications for the critical temperature of a Bose Einstein
Condensate and fraction of bosons in its ground state. We also study the
effects of compact extra dimensions on the critical temperature and the
fraction. We consider... | [
{
"created": "Fri, 9 Apr 2021 23:08:02 GMT",
"version": "v1"
}
] | 2021-08-04 | [
[
"Das",
"Saurya",
""
],
[
"Fridman",
"Mitja",
""
]
] | We study Quantum Gravity effects on the density of states in statistical mechanics and its implications for the critical temperature of a Bose Einstein Condensate and fraction of bosons in its ground state. We also study the effects of compact extra dimensions on the critical temperature and the fraction. We consider b... |
2011.07003 | Askar Ali | Askar Ali | Energy-Dependent Topological Black Holes in Massive Gravity Coupled to
Double-Logarithmic Electrodynamics | 29 Pages, 21 figures | Annalen der Physik, Volume 534, Issue 12 (2022) 2200224 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, I investigate the nonlinear magnetized black holes of massive
gravity's rainbow. In order to achieve this, I use the double-logarithmic
electromagnetic field as a matter source and derive the new anti-de Sitter
black hole solution. The effects of the massive graviton, rainbow functions,
and nonlinearit... | [
{
"created": "Fri, 13 Nov 2020 16:35:34 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Dec 2022 13:17:42 GMT",
"version": "v2"
}
] | 2023-01-02 | [
[
"Ali",
"Askar",
""
]
] | In this paper, I investigate the nonlinear magnetized black holes of massive gravity's rainbow. In order to achieve this, I use the double-logarithmic electromagnetic field as a matter source and derive the new anti-de Sitter black hole solution. The effects of the massive graviton, rainbow functions, and nonlinearity ... |
1606.08919 | Rui Pedro Lopes De Azevedo | R.P.L. Azevedo and J. P\'aramos | Dynamical analysis of generalised $f(R,\mathcal{L})$ theories | 9 pages, 5 figures, 4 tables, Published in Phys. Rev. D | Phys. Rev. D 94, 064036 (2016) | 10.1103/PhysRevD.94.064036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we use a dynamical system approach to analyse the viability of
$f(R,\mathcal{L})$ candidates for dark energy. We compare these with nonminimal
coupled $f(R)$ theories and study the solutions for exponential and power-law
forms in order to constraint the allowed range of model parameters.
| [
{
"created": "Wed, 29 Jun 2016 00:19:31 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Sep 2016 14:39:09 GMT",
"version": "v2"
}
] | 2016-09-20 | [
[
"Azevedo",
"R. P. L.",
""
],
[
"Páramos",
"J.",
""
]
] | In this work, we use a dynamical system approach to analyse the viability of $f(R,\mathcal{L})$ candidates for dark energy. We compare these with nonminimal coupled $f(R)$ theories and study the solutions for exponential and power-law forms in order to constraint the allowed range of model parameters. |
1112.4366 | Seth A. Major | Seth A. Major | Quantum Geometry Phenomenology: Angle and Semiclassical States | 5 pages, slightly extended version of the contribution to the
Loops'11 conference proceedings | null | 10.1088/1742-6596/360/1/012061 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The phenomenology for the deep spatial geometry of loop quantum gravity is
discussed. In the context of a simple model of an atom of space, it is shown
how purely combinatorial structures can affect observations. The angle operator
is used to develop a model of angular corrections to local, continuum
flat-space 3-geo... | [
{
"created": "Mon, 19 Dec 2011 15:28:15 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Major",
"Seth A.",
""
]
] | The phenomenology for the deep spatial geometry of loop quantum gravity is discussed. In the context of a simple model of an atom of space, it is shown how purely combinatorial structures can affect observations. The angle operator is used to develop a model of angular corrections to local, continuum flat-space 3-geome... |
1808.01744 | Suddhasattwa Brahma | Suddhasattwa Brahma and Dong-han Yeom | The no-boundary wave function for loop quantum cosmology | 6 pages, comments welcome | Phys. Rev. D 98, 083537 (2018) | 10.1103/PhysRevD.98.083537 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Proposing smooth initial conditions is one of the most important tasks in
quantum cosmology. On the other hand, the low-energy effective action,
appearing in the semiclassical path integral, can get nontrivial quantum
corrections near classical singularities due to specific quantum gravity
proposals. In this article,... | [
{
"created": "Mon, 6 Aug 2018 06:32:13 GMT",
"version": "v1"
}
] | 2018-11-07 | [
[
"Brahma",
"Suddhasattwa",
""
],
[
"Yeom",
"Dong-han",
""
]
] | Proposing smooth initial conditions is one of the most important tasks in quantum cosmology. On the other hand, the low-energy effective action, appearing in the semiclassical path integral, can get nontrivial quantum corrections near classical singularities due to specific quantum gravity proposals. In this article, w... |
1001.0904 | Roberto A. Sussman | Roberto A Sussman | A new approach for doing theoretical and numeric work with
Lemaitre-Tolman-Bondi dust models | 24 pages, RevTeX two column style, no figures. Typos corrected,
references added | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce quasi-local integral scalar variables for the study of
spherically symmetric Lemaitre-Tolman-Bondi (LTB) dust models. Besides
providing a covariant, and theoretically appealing, interpretation for the
parameters of these models, these variables allow us to study their dynamics
(in their full generality) ... | [
{
"created": "Wed, 6 Jan 2010 15:09:53 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 2010 07:47:50 GMT",
"version": "v2"
}
] | 2010-02-01 | [
[
"Sussman",
"Roberto A",
""
]
] | We introduce quasi-local integral scalar variables for the study of spherically symmetric Lemaitre-Tolman-Bondi (LTB) dust models. Besides providing a covariant, and theoretically appealing, interpretation for the parameters of these models, these variables allow us to study their dynamics (in their full generality) by... |
2204.04195 | Rehana Rahim | Aqeela Razzaq and Rehana Rahim | Particle dynamics in non-rotating Konoplya and Zhidenko black hole
immersed in an external uniform magnetic field | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate the dynamics of particles in the background of
non-rotating Konoplya and Zhidenko black hole that is immersed in an external
uniform magnetic field. The work involves circular motion of electric and
magnetic particles and particle acceleration. First the motion of electric
charged partic... | [
{
"created": "Fri, 8 Apr 2022 17:43:35 GMT",
"version": "v1"
}
] | 2022-04-11 | [
[
"Razzaq",
"Aqeela",
""
],
[
"Rahim",
"Rehana",
""
]
] | In this paper, we investigate the dynamics of particles in the background of non-rotating Konoplya and Zhidenko black hole that is immersed in an external uniform magnetic field. The work involves circular motion of electric and magnetic particles and particle acceleration. First the motion of electric charged particle... |
gr-qc/0004053 | Ludger Hannibal | Ludger Hannibal and Jens Warkall (Carl von Ossietzky University
Oldenburg, Germany) | Response of massive bodies to gravitational waves | 16 pages. In the revised version it is shown that the results do not
contradict standard theory in any way | null | null | null | gr-qc | null | The response of a massive body to gravitational waves is described on the
microscopic level. The results shed a new light on the commonly used oscillator
model. It is shown that apart from the non-resonant tidal motion the energy
transfer from a gravitational wave to an electromagnetically coupled body is in
general ... | [
{
"created": "Mon, 17 Apr 2000 10:17:02 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2000 13:58:54 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Hannibal",
"Ludger",
"",
"Carl von Ossietzky University\n Oldenburg, Germany"
],
[
"Warkall",
"Jens",
"",
"Carl von Ossietzky University\n Oldenburg, Germany"
]
] | The response of a massive body to gravitational waves is described on the microscopic level. The results shed a new light on the commonly used oscillator model. It is shown that apart from the non-resonant tidal motion the energy transfer from a gravitational wave to an electromagnetically coupled body is in general re... |
1903.04956 | Bhaskar Biswas | Bhaskar Biswas and Sukanta Bose | The tidal deformability of an anisotropic compact star: Implications of
GW170817 | 11 pages, 25 figures | Phys. Rev. D 99, 104002 (2019) | 10.1103/PhysRevD.99.104002 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use gravitational wave (GW) and electromagnetic (EM) observations of
GW170817 to constrain the extent of pressure anisotropy in it. While it is
quite likely that the pressure inside a neutron star is mostly isotropic,
certain physical processes or characteristics, such as phase transitions in
nuclear matter or the... | [
{
"created": "Tue, 12 Mar 2019 14:38:01 GMT",
"version": "v1"
}
] | 2019-05-08 | [
[
"Biswas",
"Bhaskar",
""
],
[
"Bose",
"Sukanta",
""
]
] | We use gravitational wave (GW) and electromagnetic (EM) observations of GW170817 to constrain the extent of pressure anisotropy in it. While it is quite likely that the pressure inside a neutron star is mostly isotropic, certain physical processes or characteristics, such as phase transitions in nuclear matter or the p... |
gr-qc/9306004 | Jason Twamley | J.Twamley | Phase-Space Decoherence: a comparison between Consistent Histories and
Environment Induced Superselection | 27 pages, 5 postscript figs in uuencoded compressed tar format
Replaced: definition of special character for the complex numbers | Phys.Rev. D48 (1993) 5730-5745 | 10.1103/PhysRevD.48.5730 | null | gr-qc | null | We examine the decoherence properties of a quantum open system as modeled by
a quantum optical system in the Markov regime. We look for decoherence in both
the Environment Induced Superselection (EIS) and Consistent Histories (CH)
frameworks. We propose a general measure of the coherence of the reduced
density matrix... | [
{
"created": "Wed, 2 Jun 1993 21:34:35 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jun 1993 23:39:54 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Twamley",
"J.",
""
]
] | We examine the decoherence properties of a quantum open system as modeled by a quantum optical system in the Markov regime. We look for decoherence in both the Environment Induced Superselection (EIS) and Consistent Histories (CH) frameworks. We propose a general measure of the coherence of the reduced density matrix a... |
0704.0646 | Max Tegmark | Max Tegmark (MIT) | The Mathematical Universe | Replaced to match accepted Found. Phys. version, 31 pages, 5 figs;
more details at http://space.mit.edu/home/tegmark/toe.html | Found.Phys.38:101-150,2008 | 10.1007/s10701-007-9186-9 | null | gr-qc astro-ph hep-th | null | I explore physics implications of the External Reality Hypothesis (ERH) that
there exists an external physical reality completely independent of us humans.
I argue that with a sufficiently broad definition of mathematics, it implies
the Mathematical Universe Hypothesis (MUH) that our physical world is an
abstract mat... | [
{
"created": "Thu, 5 Apr 2007 14:47:46 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Oct 2007 22:59:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Tegmark",
"Max",
"",
"MIT"
]
] | I explore physics implications of the External Reality Hypothesis (ERH) that there exists an external physical reality completely independent of us humans. I argue that with a sufficiently broad definition of mathematics, it implies the Mathematical Universe Hypothesis (MUH) that our physical world is an abstract mathe... |
gr-qc/0101094 | Morteza Mohseni | Morteza Mohseni | Signature transition and compactification | no figures | Phys.Lett. A267 (2000) 240-243 | 10.1016/S0375-9601(00)00106-7 | null | gr-qc | null | It is shown that a change in the signature of the space-time metric together
with compactification of internal dimensions could occure in a six-dimensional
cosmological model. We also show that this is due to interaction with Maxwell
fields having support in the internal part of the space-time.
| [
{
"created": "Wed, 24 Jan 2001 12:32:40 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Mohseni",
"Morteza",
""
]
] | It is shown that a change in the signature of the space-time metric together with compactification of internal dimensions could occure in a six-dimensional cosmological model. We also show that this is due to interaction with Maxwell fields having support in the internal part of the space-time. |
0905.4838 | Leonardo Fernandez-Jambrina | L. Fern\'andez Jambrina | Globally hyperbolic geodesically complete cosmological model | 4 pp, mprocl.sty | Published in Proceedings of the Eighth Marcel Grossmann Meeting on
General Relativity. Editor: Tsvi Piran. World Scientific, Singapore, 1409-11
(1999) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we shall show a perfect fluid cosmological model and its
properties. The model possesses an orthogonally transitive abelian
two-dimensional group of isometries that corresponds to cylindrical symmetry.
The matter content is a stiff fluid that satisfies the energy and generic
conditions. The metric is not... | [
{
"created": "Fri, 29 May 2009 12:02:41 GMT",
"version": "v1"
}
] | 2009-06-01 | [
[
"Jambrina",
"L. Fernández",
""
]
] | In this talk we shall show a perfect fluid cosmological model and its properties. The model possesses an orthogonally transitive abelian two-dimensional group of isometries that corresponds to cylindrical symmetry. The matter content is a stiff fluid that satisfies the energy and generic conditions. The metric is not s... |
1109.0546 | Thomas W. Baumgarte | Alexa N. Staley, Thomas W. Baumgarte, J. David Brown, Brian Farris and
Stuart L. Shapiro | Oppenheimer-Snyder Collapse in Moving-Puncture Coordinates | 20 pages, 9 figures | null | 10.1088/0264-9381/29/1/015003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Moving-puncture coordinates are commonly used in numerical simulations of
black holes. Their properties for vacuum Schwarzschild black holes have been
analyzed in a number of studies. The behavior of moving-puncture coordinates in
spacetimes containing matter, however, is less well understood. In this paper
we explor... | [
{
"created": "Fri, 2 Sep 2011 20:07:29 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Staley",
"Alexa N.",
""
],
[
"Baumgarte",
"Thomas W.",
""
],
[
"Brown",
"J. David",
""
],
[
"Farris",
"Brian",
""
],
[
"Shapiro",
"Stuart L.",
""
]
] | Moving-puncture coordinates are commonly used in numerical simulations of black holes. Their properties for vacuum Schwarzschild black holes have been analyzed in a number of studies. The behavior of moving-puncture coordinates in spacetimes containing matter, however, is less well understood. In this paper we explore ... |
0704.1141 | Jose Geraldo Pereira | J. G. Pereira | In Search of the Spacetime Torsion | Latex, 4 pages. Talk presented at the Rencontres de Moriond on
Gravitational Waves and Experimental Gravity, La Thuile, Italy (March 11-18,
2007) | null | null | null | gr-qc hep-th | null | Whether torsion plays or not a role in the description of the gravitational
interaction is a problem that can only be solved by experiment. This is,
however, a difficult task: since there are different possible interpretations
for torsion, there is no a model-independent way to look for it. In these
notes, two differ... | [
{
"created": "Mon, 9 Apr 2007 17:59:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pereira",
"J. G.",
""
]
] | Whether torsion plays or not a role in the description of the gravitational interaction is a problem that can only be solved by experiment. This is, however, a difficult task: since there are different possible interpretations for torsion, there is no a model-independent way to look for it. In these notes, two differen... |
1106.2183 | Neil Ashby | Neil Ashby and Peter L. Bender | Optical Clock and Drag-Free Requirements for a Shapiro Time-Delay
Mission | Presented at Rencontres de Moriond and GPhyS colloqium 2011,
"Gravitational Waves and General Relativity," La Thuile, France, March 21-27,
2011 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the next decade or two, extremely accurate tests of general relativity
under extreme conditions are expected from gravitational wave observations of
binary black hole mergers with a wide range of mass ratios. In addition, major
improvements are planned in both strong and weak equivalence principle tests;
clock mea... | [
{
"created": "Fri, 10 Jun 2011 22:31:25 GMT",
"version": "v1"
}
] | 2011-06-14 | [
[
"Ashby",
"Neil",
""
],
[
"Bender",
"Peter L.",
""
]
] | In the next decade or two, extremely accurate tests of general relativity under extreme conditions are expected from gravitational wave observations of binary black hole mergers with a wide range of mass ratios. In addition, major improvements are planned in both strong and weak equivalence principle tests; clock measu... |
gr-qc/0105052 | Sami M. | M. Sami (Deptt. of Physics, Jamia Millia Islamia, New Delhi) | Exact Inflationary Solution On The Brane | New references added, introduction enlarged and typos corrected. To
appear in Gravitation & Cosmology | Grav.Cosmol. 7 (2001) 228-230 | null | null | gr-qc | null | We study the evolution of universe with a single scalar field of constant
potential minimally coupled to gravity in the brane world cosmology.We find an
exact inflationary solution which is not in slow roll.We discuss the limiting
cases of the solution.We show that at late times the solution is asymptotic to
the de S... | [
{
"created": "Tue, 15 May 2001 13:12:15 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2001 11:43:38 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Sami",
"M.",
"",
"Deptt. of Physics, Jamia Millia Islamia, New Delhi"
]
] | We study the evolution of universe with a single scalar field of constant potential minimally coupled to gravity in the brane world cosmology.We find an exact inflationary solution which is not in slow roll.We discuss the limiting cases of the solution.We show that at late times the solution is asymptotic to the de Sit... |
2102.12292 | Yan-Gang Miao | Yang Li, Yan-Gang Miao | Distinct thermodynamic and dynamic effects produced by scale factors in
conformally related Einstein-power-Yang-Mills black holes | v1: 24 pages, 8 figures; v2: 25 pages, final version to appear in
Physical Review D | Phys. Rev. D 104, 024002 (2021) | 10.1103/PhysRevD.104.024002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamics and dynamics of high-dimensional
Einstein-power-Yang-Mills black holes in conformal gravity. Specifically, we
investigate a class of conformally related black holes whose metrics differ by
a scale factor. We show that a suitable scale factor cures the geodesic
incompleteness and the diverg... | [
{
"created": "Wed, 24 Feb 2021 14:00:28 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 2021 07:08:05 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Li",
"Yang",
""
],
[
"Miao",
"Yan-Gang",
""
]
] | We study the thermodynamics and dynamics of high-dimensional Einstein-power-Yang-Mills black holes in conformal gravity. Specifically, we investigate a class of conformally related black holes whose metrics differ by a scale factor. We show that a suitable scale factor cures the geodesic incompleteness and the divergen... |
2102.10251 | Qun-Ying Xie | Qun-Ying Xie, Qi-Ming Fu, Tao-Tao Sui, Li Zhao, and Yi Zhong | First-order formalism and thick branes in mimetic gravity | 9 pages, 6 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate thick branes generated by a scalar field in
mimetic gravity theory. By introducing two auxiliary super-potentials, we
transform the second-order field equations of the system into a set of
first-order equations. With this first-order formalism, several types of
analytical thick brane sol... | [
{
"created": "Sat, 20 Feb 2021 03:55:07 GMT",
"version": "v1"
}
] | 2021-02-23 | [
[
"Xie",
"Qun-Ying",
""
],
[
"Fu",
"Qi-Ming",
""
],
[
"Sui",
"Tao-Tao",
""
],
[
"Zhao",
"Li",
""
],
[
"Zhong",
"Yi",
""
]
] | In this paper, we investigate thick branes generated by a scalar field in mimetic gravity theory. By introducing two auxiliary super-potentials, we transform the second-order field equations of the system into a set of first-order equations. With this first-order formalism, several types of analytical thick brane solut... |
2010.13647 | Vladimir Dergachev Ph.D. | S.R. Valluri, V. Dergachev, X. Zhang, F.A. Chishtie | The Fourier Transform of the Continuous Gravitational Wave Signal | null | Phys. Rev. D 104, 024065 (2021) | 10.1103/PhysRevD.104.024065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The direct detection of continuous gravitational waves from pulsars is a much
anticipated discovery in the emerging field of multi-messenger gravitational
wave (GW) astronomy. Because putative pulsar signals are exceedingly weak large
amounts of data need to be integrated to achieve desired sensitivity.
Contemporary ... | [
{
"created": "Mon, 26 Oct 2020 15:06:49 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2021 16:18:27 GMT",
"version": "v2"
}
] | 2021-08-04 | [
[
"Valluri",
"S. R.",
""
],
[
"Dergachev",
"V.",
""
],
[
"Zhang",
"X.",
""
],
[
"Chishtie",
"F. A.",
""
]
] | The direct detection of continuous gravitational waves from pulsars is a much anticipated discovery in the emerging field of multi-messenger gravitational wave (GW) astronomy. Because putative pulsar signals are exceedingly weak large amounts of data need to be integrated to achieve desired sensitivity. Contemporary se... |
2104.08681 | Shaon Ghosh | Shaon Ghosh, Xiaoshu Liu, Jolien Creighton, Wolfgang Kastaun, Geraint
Pratten, Ignacio Magana Hernandez | Rapid model comparison of equations of state from gravitational wave
observation of binary neutron star coalescences | Dataset produced in this study
https://zenodo.org/record/4679013#.YHuUnJNKhsA | Phys. Rev. D 104, 083003 (2021) | 10.1103/PhysRevD.104.083003 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-sa/4.0/ | The discovery of the coalescence of binary neutron star GW170817 was a
watershed moment in the field of gravitational wave astronomy. Among the rich
variety of information that we were able to uncover from this discovery was the
first non-electromagnetic measurement of the neutron star radius, and the cold
nuclear eq... | [
{
"created": "Sun, 18 Apr 2021 02:20:19 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Oct 2021 15:33:15 GMT",
"version": "v2"
}
] | 2021-10-06 | [
[
"Ghosh",
"Shaon",
""
],
[
"Liu",
"Xiaoshu",
""
],
[
"Creighton",
"Jolien",
""
],
[
"Kastaun",
"Wolfgang",
""
],
[
"Pratten",
"Geraint",
""
],
[
"Hernandez",
"Ignacio Magana",
""
]
] | The discovery of the coalescence of binary neutron star GW170817 was a watershed moment in the field of gravitational wave astronomy. Among the rich variety of information that we were able to uncover from this discovery was the first non-electromagnetic measurement of the neutron star radius, and the cold nuclear equa... |
gr-qc/9506033 | Lior M. Burko | Lior M. Burko and Amos Ori | On the formation of black holes in non-symmetric gravity | 9 pages, ordinary LaTex. | Phys.Rev.Lett.75:2455-2459,1995 | 10.1103/PhysRevLett.75.2455 | Technion Preprint no. TECHNION-PH-95-7 | gr-qc | null | It has been recently suggested that the Non-symmetric Gravitational Theory
(NGT) is free of black holes. Here, we study the linear version of NGT. We find
that even with spherical symmetry the skew part of the metric is generally
non-static. In addition, if the skew field is initially regular, it will remain
regular ... | [
{
"created": "Mon, 19 Jun 1995 08:02:14 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Burko",
"Lior M.",
""
],
[
"Ori",
"Amos",
""
]
] | It has been recently suggested that the Non-symmetric Gravitational Theory (NGT) is free of black holes. Here, we study the linear version of NGT. We find that even with spherical symmetry the skew part of the metric is generally non-static. In addition, if the skew field is initially regular, it will remain regular ev... |
gr-qc/0611043 | Leonardo Modesto | Leonardo Modesto | Black hole interior from loop quantum gravity | 12 pages, 7 figures. Advances in High Energy Physics Volume 2008
(2008), Article ID 459290 | Adv.High Energy Phys.2008:459290,2008 | 10.1155/2008/459290 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we calculate modifications to the Schwarzschild solution by
using a semiclassical analysis of loop quantum black hole. We obtain a metric
inside the event horizon that coincides with the Schwarzschild solution near
the horizon but that is substantially different at the Planck scale. In
particular we obt... | [
{
"created": "Mon, 6 Nov 2006 20:03:32 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2009 00:14:41 GMT",
"version": "v2"
}
] | 2009-07-24 | [
[
"Modesto",
"Leonardo",
""
]
] | In this paper we calculate modifications to the Schwarzschild solution by using a semiclassical analysis of loop quantum black hole. We obtain a metric inside the event horizon that coincides with the Schwarzschild solution near the horizon but that is substantially different at the Planck scale. In particular we obtai... |
2204.00337 | Dimitri Estevez | C. All\'en\'e, N. Andres, M. Assiduo, F. Aubin, D. Buskulic, R.
Chierici, D. Estevez, F. Faedi, G. M. Guidi, V. Juste, F. Marion, B. Mours,
E. Nitoglia, V. Sordini, A. Syx | Relative calibration of the LIGO and Virgo detectors using astrophysical
events from their third observing run | 10 pages, 8 figures | null | 10.1088/1361-6382/ac8c7b | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a method to assess the relative scale of the strain measured in
the different detectors of the gravitational-wave network, using binary black
hole (BBH) events detected during the third observing run (O3). The number of
such signals is becoming sufficiently large to adopt a statistical approach
based on th... | [
{
"created": "Fri, 1 Apr 2022 10:32:35 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 2022 06:57:16 GMT",
"version": "v2"
}
] | 2022-08-29 | [
[
"Alléné",
"C.",
""
],
[
"Andres",
"N.",
""
],
[
"Assiduo",
"M.",
""
],
[
"Aubin",
"F.",
""
],
[
"Buskulic",
"D.",
""
],
[
"Chierici",
"R.",
""
],
[
"Estevez",
"D.",
""
],
[
"Faedi",
"F.",
""... | We explore a method to assess the relative scale of the strain measured in the different detectors of the gravitational-wave network, using binary black hole (BBH) events detected during the third observing run (O3). The number of such signals is becoming sufficiently large to adopt a statistical approach based on the ... |
0901.2292 | L\'aszl\'o \'A Gergely | Z. Keresztes, L. \'A. Gergely, V. Gorini, U. Moschella, A. Yu.
Kamenshchik | Tachyon cosmology, supernovae data and the Big Brake singularity | v2: 8 pages, 1 figure + 2 figure panels of 6 figures each; slightly
shortened for improved presentation; new references; published version | Phys.Rev.D79:083504,2009 | 10.1103/PhysRevD.79.083504 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the existing observational data on type Ia Supernovae with the
evolutions of the universe predicted by a one-parameter family of tachyon
models which we have introduced recently in paper \cite{we-tach}. Among the set
of the trajectories of the model which are compatible with the data there is a
consistent ... | [
{
"created": "Thu, 15 Jan 2009 15:58:31 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2009 12:21:20 GMT",
"version": "v2"
}
] | 2009-04-22 | [
[
"Keresztes",
"Z.",
""
],
[
"Gergely",
"L. Á.",
""
],
[
"Gorini",
"V.",
""
],
[
"Moschella",
"U.",
""
],
[
"Kamenshchik",
"A. Yu.",
""
]
] | We compare the existing observational data on type Ia Supernovae with the evolutions of the universe predicted by a one-parameter family of tachyon models which we have introduced recently in paper \cite{we-tach}. Among the set of the trajectories of the model which are compatible with the data there is a consistent su... |
2004.14405 | Alex Chanson | Alex Chanson, Jacob Ciafre, Maria J. Rodriguez | Emergent Black Hole Thermodynamics from Monodromy | null | Phys. Rev. D 104, 024055 (2021) | 10.1103/PhysRevD.104.024055 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the equations of motion of quantum field theories in curved
backgrounds encode new fundamental black hole thermodynamic relations. We
define new entropy variation relations. These `emerge' through the monodromies
that capture the infinitesimal changes in the black hole background produced by
the field e... | [
{
"created": "Wed, 29 Apr 2020 18:00:36 GMT",
"version": "v1"
}
] | 2021-07-28 | [
[
"Chanson",
"Alex",
""
],
[
"Ciafre",
"Jacob",
""
],
[
"Rodriguez",
"Maria J.",
""
]
] | We argue that the equations of motion of quantum field theories in curved backgrounds encode new fundamental black hole thermodynamic relations. We define new entropy variation relations. These `emerge' through the monodromies that capture the infinitesimal changes in the black hole background produced by the field exc... |
gr-qc/9504028 | Donald Marolf | Gary T. Horowitz and Donald Marolf | Quantum Probes of Spacetime Singularities | 12 pages, RevTeX, no figures, A few breif comments added and typos
corrected | Phys.Rev. D52 (1995) 5670-5675 | 10.1103/PhysRevD.52.5670 | UCSBTH-95-5 | gr-qc hep-th | null | It is shown that there are static spacetimes with timelike curvature
singularities which appear completely nonsingular when probed with quantum test
particles. Examples include extreme dilatonic black holes and the fundamental
string solution. In these spacetimes, the dynamics of quantum particles is well
defined and... | [
{
"created": "Wed, 19 Apr 1995 21:37:56 GMT",
"version": "v1"
},
{
"created": "Mon, 1 May 1995 21:16:08 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Aug 1995 19:06:39 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Horowitz",
"Gary T.",
""
],
[
"Marolf",
"Donald",
""
]
] | It is shown that there are static spacetimes with timelike curvature singularities which appear completely nonsingular when probed with quantum test particles. Examples include extreme dilatonic black holes and the fundamental string solution. In these spacetimes, the dynamics of quantum particles is well defined and u... |
1109.5642 | Manuel Tiglio | Sarah Caudill, Scott E. Field, Chad R. Galley, Frank Herrmann, Manuel
Tiglio | Reduced Basis representations of multi-mode black hole ringdown
gravitational waves | Edits to match the final version to appear in Classical and Quantum
Gravity | null | 10.1088/0264-9381/29/9/095016 | null | gr-qc astro-ph.CO math.NA physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct compact and high accuracy Reduced Basis (RB) representations of
single and multiple quasinormal modes (QNMs). The RB method determines a
hierarchical and relatively small set of the most relevant waveforms. We find
that the exponential convergence of the method allows for a dramatic
compression of templa... | [
{
"created": "Mon, 26 Sep 2011 17:15:51 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Mar 2012 16:41:24 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Caudill",
"Sarah",
""
],
[
"Field",
"Scott E.",
""
],
[
"Galley",
"Chad R.",
""
],
[
"Herrmann",
"Frank",
""
],
[
"Tiglio",
"Manuel",
""
]
] | We construct compact and high accuracy Reduced Basis (RB) representations of single and multiple quasinormal modes (QNMs). The RB method determines a hierarchical and relatively small set of the most relevant waveforms. We find that the exponential convergence of the method allows for a dramatic compression of template... |
gr-qc/0111059 | Stefano Liberati | C. Barcelo (Portsmouth U.), S. Liberati (Maryland U.), Matt Visser
(Washington U., St. Louis) | Refringence, field theory, and normal modes | 18 pages, RevTex4 | Class.Quant.Grav. 19 (2002) 2961-2982 | 10.1088/0264-9381/19/11/314 | null | gr-qc | null | In a previous paper [gr-qc/0104001; Class. Quant. Grav. 18 (2001) 3595-3610]
we have shown that the occurrence of curved spacetime ``effective Lorentzian
geometries'' is a generic result of linearizing an arbitrary classical field
theory around some non-trivial background configuration. This observation
explains the ... | [
{
"created": "Mon, 19 Nov 2001 18:25:12 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Barcelo",
"C.",
"",
"Portsmouth U."
],
[
"Liberati",
"S.",
"",
"Maryland U."
],
[
"Visser",
"Matt",
"",
"Washington U., St. Louis"
]
] | In a previous paper [gr-qc/0104001; Class. Quant. Grav. 18 (2001) 3595-3610] we have shown that the occurrence of curved spacetime ``effective Lorentzian geometries'' is a generic result of linearizing an arbitrary classical field theory around some non-trivial background configuration. This observation explains the ub... |
2305.01399 | Samuel S\'anchez L\'opez | Samuel S\'anchez L\'opez, Konstantinos Dimopoulos, Alexandros Karam,
and Eemeli Tomberg | Observable Gravitational Waves from Hyperkination in Palatini Gravity
and Beyond | 23 pages, 7 figures, published version, license updated | Eur. Phys. J. C 83 (2023) 1152 | 10.1140/epjc/s10052-023-12332-x | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider cosmology with an inflaton scalar field with an additional
quartic kinetic term. Such a theory can be motivated by Palatini $R+R^2$
modified gravity. Assuming a runaway inflaton potential, we take the Universe
to become dominated by the kinetic energy density of the scalar field after
inflation. Initially... | [
{
"created": "Tue, 2 May 2023 13:18:06 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jun 2023 11:12:45 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Dec 2023 17:48:40 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Dec 2023 19:07:28 GMT",
"version": "v4"
}
] | 2024-01-02 | [
[
"López",
"Samuel Sánchez",
""
],
[
"Dimopoulos",
"Konstantinos",
""
],
[
"Karam",
"Alexandros",
""
],
[
"Tomberg",
"Eemeli",
""
]
] | We consider cosmology with an inflaton scalar field with an additional quartic kinetic term. Such a theory can be motivated by Palatini $R+R^2$ modified gravity. Assuming a runaway inflaton potential, we take the Universe to become dominated by the kinetic energy density of the scalar field after inflation. Initially, ... |
2110.03388 | Gabriel Leuenberger | Gabriel Leuenberger | Emergence of Minkowski-Spacetime by Simple Deterministic Graph Rewriting | null | Universe 2022, 8(3), 149 | 10.3390/universe8030149 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The causal set program as well as the Wolfram physics project leave open the
problem of how a graph that is a (3+1)-dimensional Minkowski-spacetime
according to its simple geodesic distances, could be generated solely from
simple deterministic rules. This paper provides a solution by describing simple
rules that char... | [
{
"created": "Tue, 5 Oct 2021 22:04:27 GMT",
"version": "v1"
}
] | 2022-07-07 | [
[
"Leuenberger",
"Gabriel",
""
]
] | The causal set program as well as the Wolfram physics project leave open the problem of how a graph that is a (3+1)-dimensional Minkowski-spacetime according to its simple geodesic distances, could be generated solely from simple deterministic rules. This paper provides a solution by describing simple rules that charac... |
0707.4434 | Alicia M. Sintes | Miquel Trias and Alicia M. Sintes | LISA observations of supermassive black holes: parameter estimation
using full post-Newtonian inspiral waveforms | Final version. Accepted for publication in Phys. Rev. D | Phys.Rev.D77:024030,2008 | 10.1103/PhysRevD.77.024030 | null | gr-qc | null | We study parameter estimation of supermassive black hole binary systems in
the final stage of inspiral using the full post-Newtonian gravitational
waveforms. We restrict our analysis to systems in circular orbit with
negligible spins, in the mass range $10^8\Ms-10^5\Ms$, and compare the results
with those arising fro... | [
{
"created": "Mon, 30 Jul 2007 16:38:31 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Nov 2007 13:04:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Trias",
"Miquel",
""
],
[
"Sintes",
"Alicia M.",
""
]
] | We study parameter estimation of supermassive black hole binary systems in the final stage of inspiral using the full post-Newtonian gravitational waveforms. We restrict our analysis to systems in circular orbit with negligible spins, in the mass range $10^8\Ms-10^5\Ms$, and compare the results with those arising from ... |
2303.16714 | Joao Rafael Lucio Dos Santos | Joao R. L. Santos, S. Santos da Costa, Romario S. Santos | Cosmological models in $f(R,T)$-$\Lambda(\phi)$ gravity | 10 figures; to be published in Physics of the Dark Universe | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The Universe is currently in a phase of accelerated expansion, a fact that
was experimentally proven in the late 1990s. Cosmological models involving
scalar fields allow the description of this accelerated expansion regime in the
Cosmos and present themselves as a promising alternative in the study of the
inflationar... | [
{
"created": "Wed, 29 Mar 2023 14:15:01 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Oct 2023 03:58:55 GMT",
"version": "v2"
}
] | 2023-10-11 | [
[
"Santos",
"Joao R. L.",
""
],
[
"da Costa",
"S. Santos",
""
],
[
"Santos",
"Romario S.",
""
]
] | The Universe is currently in a phase of accelerated expansion, a fact that was experimentally proven in the late 1990s. Cosmological models involving scalar fields allow the description of this accelerated expansion regime in the Cosmos and present themselves as a promising alternative in the study of the inflationary ... |
1512.08618 | Somenath Chakrabarty | Soma Mitra and Somenath Chakrabarty | The Propagation of de Broglie Waves in Rindler Space | 8 pages REVTEX file, no figure | Scientific Voyage, Volume-2, Issue-3, Page:1-8. Date of
publication: September 2016 | null | null | gr-qc astro-ph.HE quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we have studied the propagation of matter waves in Rindler
space. We have also developed the formalism to obtained space dependent
refractive index for de Broglie waves for the particle and shown the
possibility of particle emission from the event horizon of classical black
holes, when observed from a... | [
{
"created": "Tue, 29 Dec 2015 08:31:40 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2017 05:50:18 GMT",
"version": "v2"
}
] | 2017-09-08 | [
[
"Mitra",
"Soma",
""
],
[
"Chakrabarty",
"Somenath",
""
]
] | In this article we have studied the propagation of matter waves in Rindler space. We have also developed the formalism to obtained space dependent refractive index for de Broglie waves for the particle and shown the possibility of particle emission from the event horizon of classical black holes, when observed from a u... |
gr-qc/9505031 | null | Alexander Vilenkin | Making Predictions in Eternally Inflating Universe | 25 pages, 4 figures can be faxed on request | Phys.Rev. D52 (1995) 3365-3374 | 10.1103/PhysRevD.52.3365 | null | gr-qc astro-ph | null | Eternally inflating universes can contain large thermalized regions with
different values of the constants of Nature and with different density
fluctuation spectra. To find the probability for a `typical' observer to detect
a certain set of constants, or a certain fluctuation spectrum, one needs to
compare the volume... | [
{
"created": "Thu, 18 May 1995 19:31:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Vilenkin",
"Alexander",
""
]
] | Eternally inflating universes can contain large thermalized regions with different values of the constants of Nature and with different density fluctuation spectra. To find the probability for a `typical' observer to detect a certain set of constants, or a certain fluctuation spectrum, one needs to compare the volumes ... |
gr-qc/0301108 | Bernd Schroers | C. Meusburger and B. J. Schroers | Poisson structure and symmetry in the Chern-Simons formulation of
(2+1)-dimensional gravity | 49 pages amslatex, 7 eps figures | Class.Quant.Grav. 20 (2003) 2193-2234 | 10.1088/0264-9381/20/11/318 | EMPG-03-02 | gr-qc hep-th math-ph math.MP | null | In the formulation of (2+1)-dimensional gravity as a Chern-Simons gauge
theory, the phase space is the moduli space of flat Poincar\'e group
connections. Using the combinatorial approach developed by Fock and Rosly, we
give an explicit description of the phase space and its Poisson structure for
the general case of a... | [
{
"created": "Mon, 27 Jan 2003 15:05:32 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Meusburger",
"C.",
""
],
[
"Schroers",
"B. J.",
""
]
] | In the formulation of (2+1)-dimensional gravity as a Chern-Simons gauge theory, the phase space is the moduli space of flat Poincar\'e group connections. Using the combinatorial approach developed by Fock and Rosly, we give an explicit description of the phase space and its Poisson structure for the general case of a g... |
gr-qc/9310038 | null | Carlos O. Escobar, Lea Ferreira dos Santos, and Paulo C. Marques | Quantum Limits for Measurements on Macroscopic Bodies : A Decoherence
Analysis | (e-mail : pacmarques@if.usp.br ) , 8 pages of output, RevTeX file ,
preprint IFUSP/P-1048 (Universidade de Sao Paulo), (revised version accepted
for publication in the Physical Review A) | null | 10.1103/PhysRevA.50.1913 | null | gr-qc cond-mat hep-th | null | We consider in this paper the quantum limits for measurements on macroscopic
bodies which are obtained in a novel way employing the concept of decoherence
coming from an analysis of the quantum mechanics of dissipative systems. Two
cases are analysed, the free mass and the harmonic oscillator, and for both
systems we... | [
{
"created": "Wed, 27 Oct 1993 07:00:20 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Dec 1993 11:42:39 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Jun 1994 21:53:24 GMT",
"version": "v3"
}
] | 2009-10-22 | [
[
"Escobar",
"Carlos O.",
""
],
[
"Santos",
"Lea Ferreira dos",
""
],
[
"Marques",
"Paulo C.",
""
]
] | We consider in this paper the quantum limits for measurements on macroscopic bodies which are obtained in a novel way employing the concept of decoherence coming from an analysis of the quantum mechanics of dissipative systems. Two cases are analysed, the free mass and the harmonic oscillator, and for both systems we c... |
1902.09557 | Alberto Salvio | Alberto Salvio | Metastability in Quadratic Gravity | 10 pages, 8 figures; v2 Section 2.1 and more explanations added | Phys. Rev. D 99, 103507 (2019) | 10.1103/PhysRevD.99.103507 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quadratic gravity is a UV completion of general relativity, which also solves
the hierarchy problem. The presence of 4 derivatives implies via the
Ostrogradsky theorem that the $classical$ Hamiltonian is unbounded from below.
Here we solve this issue by showing that the relevant solutions are not
unstable but metasta... | [
{
"created": "Mon, 25 Feb 2019 19:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2019 14:45:36 GMT",
"version": "v2"
}
] | 2019-05-15 | [
[
"Salvio",
"Alberto",
""
]
] | Quadratic gravity is a UV completion of general relativity, which also solves the hierarchy problem. The presence of 4 derivatives implies via the Ostrogradsky theorem that the $classical$ Hamiltonian is unbounded from below. Here we solve this issue by showing that the relevant solutions are not unstable but metastabl... |
2404.13332 | Kaushik Bhattacharya | Kaushik Bhattacharya, Dipanjan Dey, Priyanka Saha | The initial value problem in cosmology: An alternative derivation for
beginners | 18 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this article we address the puzzle related to the existence of a proper
cosmological solution, where the number of equations exceeds the number of
unknown functions. Although only two of the various dynamical equations are
independent, the solution of those two equations must have to satisfy all the
dynamical equa... | [
{
"created": "Sat, 20 Apr 2024 09:41:26 GMT",
"version": "v1"
}
] | 2024-04-23 | [
[
"Bhattacharya",
"Kaushik",
""
],
[
"Dey",
"Dipanjan",
""
],
[
"Saha",
"Priyanka",
""
]
] | In this article we address the puzzle related to the existence of a proper cosmological solution, where the number of equations exceeds the number of unknown functions. Although only two of the various dynamical equations are independent, the solution of those two equations must have to satisfy all the dynamical equati... |
2205.08599 | Vasilis Oikonomou | V.K. Oikonomou, Ifigeneia Giannakoudi | A Panorama of Viable $F(R)$ Gravity Dark Energy Models | IJMPD Accepted | null | 10.1142/S0218271822500754 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we shall study the late-time dynamics of several $F(R)$ gravity
models. By appropriately expressing the field equations in terms of the
redshift and of a statefinder function, we shall solve numerically the field
equations using appropriate physical motivated initial conditions. We consider
models which,... | [
{
"created": "Tue, 17 May 2022 19:37:59 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Oikonomou",
"V. K.",
""
],
[
"Giannakoudi",
"Ifigeneia",
""
]
] | In this work we shall study the late-time dynamics of several $F(R)$ gravity models. By appropriately expressing the field equations in terms of the redshift and of a statefinder function, we shall solve numerically the field equations using appropriate physical motivated initial conditions. We consider models which, b... |
2306.01580 | Serena Giardino | Serena Giardino, Andrea Giusti | First-order thermodynamics of scalar-tensor gravity | 20 pages. The results contained in this paper have been partially
presented at WASCOM 2021 | null | 10.1007/s11587-023-00801-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first-order thermodynamics of scalar-tensor theory is a novel approach
that exploits the intriguing relationship between gravity and thermodynamics to
better understand the space of gravity theories. It is based on using Eckart's
first-order irreversible thermodynamics on the effective imperfect fluid
describing ... | [
{
"created": "Fri, 2 Jun 2023 14:49:19 GMT",
"version": "v1"
}
] | 2023-08-24 | [
[
"Giardino",
"Serena",
""
],
[
"Giusti",
"Andrea",
""
]
] | The first-order thermodynamics of scalar-tensor theory is a novel approach that exploits the intriguing relationship between gravity and thermodynamics to better understand the space of gravity theories. It is based on using Eckart's first-order irreversible thermodynamics on the effective imperfect fluid describing sc... |
1910.04996 | Daniela Pugliese Dr | D.Pugliese and H. Quevedo | On the metric bundles of axially symmetric spacetimes | 10 pages; 1 figure; RAGtime 20, 2018 | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the definition of metric bundles in axially symmetric geometries
and give explicit examples for solutions of Einstein equations. These
structures have been introduced in Pugliese and Quevedo (2019) to explain some
properties of black holes (BHs) and naked singularities (NSs), investigated
through the analy... | [
{
"created": "Fri, 11 Oct 2019 07:09:03 GMT",
"version": "v1"
}
] | 2019-10-14 | [
[
"Pugliese",
"D.",
""
],
[
"Quevedo",
"H.",
""
]
] | We present the definition of metric bundles in axially symmetric geometries and give explicit examples for solutions of Einstein equations. These structures have been introduced in Pugliese and Quevedo (2019) to explain some properties of black holes (BHs) and naked singularities (NSs), investigated through the analysi... |
2404.07058 | David Kubiznak | Francesco Di Filippo, Ivan Kol\'a\v{r}, David Kubiznak | Inner-extremal regular black holes from pure gravity | 12 pages, 1 figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently it was shown that essentially all regular black hole models
constructed so far can be obtained as solutions of vacuum gravity equations,
upon considering an infinite series of quasi-topological higher curvature
corrections. Here we show that such a construction can be upgraded to yield
regular black holes wi... | [
{
"created": "Wed, 10 Apr 2024 14:46:40 GMT",
"version": "v1"
}
] | 2024-04-11 | [
[
"Di Filippo",
"Francesco",
""
],
[
"Kolář",
"Ivan",
""
],
[
"Kubiznak",
"David",
""
]
] | Recently it was shown that essentially all regular black hole models constructed so far can be obtained as solutions of vacuum gravity equations, upon considering an infinite series of quasi-topological higher curvature corrections. Here we show that such a construction can be upgraded to yield regular black holes with... |
1802.01959 | Ion I. Cotaescu | Ion I. Cotaescu | Collective classical motion on hyperbolic spacetimes of any dimensions | 13 pages, no figures | Modern Physics Letters A 2 Vol. 33, No. 1 (2019) 1950165 (11
pages) | 10.1142/S0217732319501657 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geodesics equations on de Sitter and anti-de Sitter spacetimes of any
dimensions, are the starting point for deriving the general form of the
Boltzmann equation in terms of conserved quantities. The simple equation for
the non-equilibrium Marle and Anderson-Witting models are derived and the
distributions of the ... | [
{
"created": "Tue, 6 Feb 2018 14:23:49 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2018 16:21:20 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Apr 2018 14:48:06 GMT",
"version": "v3"
},
{
"created": "Sun, 14 Apr 2019 05:51:58 GMT",
"version": "v4"
}
] | 2019-04-16 | [
[
"Cotaescu",
"Ion I.",
""
]
] | The geodesics equations on de Sitter and anti-de Sitter spacetimes of any dimensions, are the starting point for deriving the general form of the Boltzmann equation in terms of conserved quantities. The simple equation for the non-equilibrium Marle and Anderson-Witting models are derived and the distributions of the Bo... |
1009.0504 | Theodore Drivas D | Theodore D. Drivas, Samuel E. Gralla | Dependence of Self-force on Central Object | null | Class.Quant.Grav.28:145025,2011 | 10.1088/0264-9381/28/14/145025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a particle in orbit about a static spherically symmetric body, we study
the change in self-force that results when the central body type (i.e., the
choice of interior metric for the Schwarzschild exterior) is changed. While a
straight self-force is difficult to compute because of the need for
regularization, such... | [
{
"created": "Thu, 2 Sep 2010 18:52:26 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2011 16:26:26 GMT",
"version": "v2"
}
] | 2011-06-24 | [
[
"Drivas",
"Theodore D.",
""
],
[
"Gralla",
"Samuel E.",
""
]
] | For a particle in orbit about a static spherically symmetric body, we study the change in self-force that results when the central body type (i.e., the choice of interior metric for the Schwarzschild exterior) is changed. While a straight self-force is difficult to compute because of the need for regularization, such a... |
1603.04720 | Cosimo Bambi | Alejandro Cardenas-Avendano, Jiachen Jiang, Cosimo Bambi | Testing the Kerr black hole hypothesis: comparison between the
gravitational wave and the iron line approaches | 5 pages, 3 figures. v2: updated some references as in the published
version | Phys.Lett.B760:254-258,2016 | 10.1016/j.physletb.2016.06.075 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent announcement of the detection of gravitational waves by the
LIGO/Virgo collaboration has opened a new window to test the nature of
astrophysical black holes. Konoplya & Zhidenko have shown how the LIGO data of
GW 150914 can constrain possible deviations from the Kerr metric. In this
letter, we compare thei... | [
{
"created": "Tue, 15 Mar 2016 15:22:59 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2016 04:59:14 GMT",
"version": "v2"
}
] | 2016-07-15 | [
[
"Cardenas-Avendano",
"Alejandro",
""
],
[
"Jiang",
"Jiachen",
""
],
[
"Bambi",
"Cosimo",
""
]
] | The recent announcement of the detection of gravitational waves by the LIGO/Virgo collaboration has opened a new window to test the nature of astrophysical black holes. Konoplya & Zhidenko have shown how the LIGO data of GW 150914 can constrain possible deviations from the Kerr metric. In this letter, we compare their ... |
0707.3190 | Nikolai V. Mitskievich | N.V. Mitskievich | Electromagnetism and perfect fluids interplay in multidimensional
spacetimes | 5 pages, a talk delivered at the 11th Marcel Grossmann Meeting (2006) | null | 10.1142/9789812834300_0140 | null | gr-qc | null | We consider fields in (D>2)-dimensional spacetime, whose potential is r-form
(skew-symmetric tensor of rank r), the field tensor F being its exterior
derivative and the Lagrangian, a function of the quadratic invariant I of this
tensor. It is shown that vector field (r=1) describes electromagnetic field
only for D=4.... | [
{
"created": "Sat, 21 Jul 2007 06:58:25 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Mitskievich",
"N. V.",
""
]
] | We consider fields in (D>2)-dimensional spacetime, whose potential is r-form (skew-symmetric tensor of rank r), the field tensor F being its exterior derivative and the Lagrangian, a function of the quadratic invariant I of this tensor. It is shown that vector field (r=1) describes electromagnetic field only for D=4. I... |
gr-qc/9511058 | Andrei Linde | Andrei Linde and Arthur Mezhlumian | On Regularization Scheme Dependence of Predictions in Inflationary
Cosmology | 8 pages, RevTex | Phys.Rev.D53:4267-4274,1996 | 10.1103/PhysRevD.53.4267 | SU-ITP-95-24 | gr-qc astro-ph hep-th | null | We show that there exists a large class of regularization schemes for
probabilistic predictions in the theory of a self-reproducing inflationary
univere, all of which eliminate the apparent dependence on the time
reparametrization. However, all these schemes lead to different answers for
relative probabilities of fin... | [
{
"created": "Wed, 22 Nov 1995 02:23:31 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Linde",
"Andrei",
""
],
[
"Mezhlumian",
"Arthur",
""
]
] | We show that there exists a large class of regularization schemes for probabilistic predictions in the theory of a self-reproducing inflationary univere, all of which eliminate the apparent dependence on the time reparametrization. However, all these schemes lead to different answers for relative probabilities of findi... |
2404.13450 | Erdem Sucu | Erdem Sucu | Investigating the Generalized Uncertainty Principle Effects on Hawking
Radiation in Rotating Linear Dilaton Black Holes | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The impact of the Generalized Uncertainty Principle (GUP) on Hawking particle
emission in a rotating linear dilaton black hole (RLDBH) spacetime is examined
in this thesis. The concerned study presents a thermal emission model for black
holes (BHs) that incorporates the influence of gravitational lens particles
throu... | [
{
"created": "Sat, 20 Apr 2024 19:19:17 GMT",
"version": "v1"
}
] | 2024-04-23 | [
[
"Sucu",
"Erdem",
""
]
] | The impact of the Generalized Uncertainty Principle (GUP) on Hawking particle emission in a rotating linear dilaton black hole (RLDBH) spacetime is examined in this thesis. The concerned study presents a thermal emission model for black holes (BHs) that incorporates the influence of gravitational lens particles through... |
1903.00025 | Tom Stratton | Tom Stratton and Sam R. Dolan | Rainbow scattering of gravitational plane waves by a compact body | 23 pages, 7 figures. Typos corrected (notably in equations 24 and
25), and references updated. Added discussion on astrophysical context and
detectability | Phys. Rev. D 100, 024007 (2019) | 10.1103/PhysRevD.100.024007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the time-independent scattering of a planar gravitational wave
propagating in the curved spacetime of a compact body with a polytropic
equation of state. We begin by considering the geometric-optics limit, in which
the gravitational wave propagates along null geodesics of the spacetime; we
show that a wavefr... | [
{
"created": "Thu, 28 Feb 2019 19:00:52 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 2019 11:27:14 GMT",
"version": "v2"
}
] | 2019-07-25 | [
[
"Stratton",
"Tom",
""
],
[
"Dolan",
"Sam R.",
""
]
] | We study the time-independent scattering of a planar gravitational wave propagating in the curved spacetime of a compact body with a polytropic equation of state. We begin by considering the geometric-optics limit, in which the gravitational wave propagates along null geodesics of the spacetime; we show that a wavefron... |
2301.10491 | Arthur Tolley | Arthur E. Tolley, Gareth S. Cabourn Davies, Ian W. Harry, Andrew P.
Lundgren | ArchEnemy: Removing scattered-light glitches from gravitational wave
data | 31 pages + acknowledgements, references and appendices, 13 figures | Class. Quantum Grav. 40 165005 (2023) | 10.1088/1361-6382/ace22f | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Data recorded by gravitational wave detectors includes many non-astrophysical
transient noise bursts, the most common of which is caused by scattered-light
within the detectors. These so-called ``glitches'' in the data impact the
ability to both observe and characterize incoming gravitational wave signals.
In this wo... | [
{
"created": "Wed, 25 Jan 2023 10:01:07 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jul 2023 13:36:31 GMT",
"version": "v2"
}
] | 2023-07-21 | [
[
"Tolley",
"Arthur E.",
""
],
[
"Davies",
"Gareth S. Cabourn",
""
],
[
"Harry",
"Ian W.",
""
],
[
"Lundgren",
"Andrew P.",
""
]
] | Data recorded by gravitational wave detectors includes many non-astrophysical transient noise bursts, the most common of which is caused by scattered-light within the detectors. These so-called ``glitches'' in the data impact the ability to both observe and characterize incoming gravitational wave signals. In this work... |
1005.5560 | Manuel Tiglio | Chad R. Galley, Frank Herrmann, John Silberholz, Manuel Tiglio,
Gustavo Guerberoff | Statistical constraints on binary black hole inspiral dynamics | null | Class.Quant.Grav.27:245007,2010 | 10.1088/0264-9381/27/24/245007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a statistical analysis of the binary black hole problem in the
post-Newtonian approximation by systematically sampling and evolving the
parameter space of initial configurations for quasi-circular inspirals. Through
a principal component analysis of spin and orbital angular momentum variables
we systematic... | [
{
"created": "Sun, 30 May 2010 19:56:14 GMT",
"version": "v1"
}
] | 2010-12-06 | [
[
"Galley",
"Chad R.",
""
],
[
"Herrmann",
"Frank",
""
],
[
"Silberholz",
"John",
""
],
[
"Tiglio",
"Manuel",
""
],
[
"Guerberoff",
"Gustavo",
""
]
] | We perform a statistical analysis of the binary black hole problem in the post-Newtonian approximation by systematically sampling and evolving the parameter space of initial configurations for quasi-circular inspirals. Through a principal component analysis of spin and orbital angular momentum variables we systematical... |
gr-qc/0308064 | Hongbao Zhang | Hongbao Zhang, Zhoujian Cao, Chongshou Gao | Hawking radiation from spherically symmetrical gravitational collapse to
an extremal R-N black hole for a charged scalar field | 10 pages, 1 figure | Commun.Theor.Phys. 41 (2004) 385-390 | 10.1088/0253-6102/41/3/385 | null | gr-qc | null | Sijie Gao has recently investigated Hawking radiation from spherically
symmetrical gravitational collapse to an extremal R-N black hole for a real
scalar field. Especially he estimated the upper bound for the expected number
of particles in any wave packet belonging to $\mathcal{H}_{out}$ spontaneously
produced from ... | [
{
"created": "Wed, 20 Aug 2003 08:55:23 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Zhang",
"Hongbao",
""
],
[
"Cao",
"Zhoujian",
""
],
[
"Gao",
"Chongshou",
""
]
] | Sijie Gao has recently investigated Hawking radiation from spherically symmetrical gravitational collapse to an extremal R-N black hole for a real scalar field. Especially he estimated the upper bound for the expected number of particles in any wave packet belonging to $\mathcal{H}_{out}$ spontaneously produced from th... |
1904.07042 | Antonio Pereira Jr | Antonio D. Pereira | Quantum spacetime and the renormalization group: Progress and visions | 14 pages, 4 figures, Proceedings of "Progress and Visions in Quantum
Theory in View of Gravity: Bridging foundations of physics and mathematics",
Leipzig, 2018 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quest for a consistent theory which describes the quantum microstructure
of spacetime seems to require some departure from the paradigms that have been
followed in the construction of quantum theories for the other fundamental
interactions. In this contribution we briefly review two approaches to quantum
gravity,... | [
{
"created": "Mon, 15 Apr 2019 13:45:56 GMT",
"version": "v1"
}
] | 2019-04-16 | [
[
"Pereira",
"Antonio D.",
""
]
] | The quest for a consistent theory which describes the quantum microstructure of spacetime seems to require some departure from the paradigms that have been followed in the construction of quantum theories for the other fundamental interactions. In this contribution we briefly review two approaches to quantum gravity, n... |
gr-qc/0607056 | Lee Lindblom | Mark A. Scheel, Harald P. Pfeiffer, Lee Lindblom, Lawrence E. Kidder,
Oliver Rinne, and Saul A. Teukolsky | Solving Einstein's Equations With Dual Coordinate Frames | Updated to agree with published version | Phys.Rev. D74 (2006) 104006 | 10.1103/PhysRevD.74.104006 | null | gr-qc | null | A method is introduced for solving Einstein's equations using two distinct
coordinate systems. The coordinate basis vectors associated with one system are
used to project out components of the metric and other fields, in analogy with
the way fields are projected onto an orthonormal tetrad basis. These field
component... | [
{
"created": "Thu, 13 Jul 2006 17:49:22 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Dec 2007 16:41:27 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Scheel",
"Mark A.",
""
],
[
"Pfeiffer",
"Harald P.",
""
],
[
"Lindblom",
"Lee",
""
],
[
"Kidder",
"Lawrence E.",
""
],
[
"Rinne",
"Oliver",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | A method is introduced for solving Einstein's equations using two distinct coordinate systems. The coordinate basis vectors associated with one system are used to project out components of the metric and other fields, in analogy with the way fields are projected onto an orthonormal tetrad basis. These field components ... |
1803.08854 | Ricardo J. Alonso-Blanco | Ricardo Alonso-Blanco and Jes\'us Mu\~noz-D\'iaz | Flux-variational formulation of relativistic perfect fluids | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a variational formulation of perfect fluids on a general
pseudoriemannian manifold by variating tangent fields according the flux
produced by them. In this approach no constraints are needed. As a result,
Euler and continuity equations are obtained quite directly.
| [
{
"created": "Fri, 23 Mar 2018 15:58:33 GMT",
"version": "v1"
}
] | 2018-03-26 | [
[
"Alonso-Blanco",
"Ricardo",
""
],
[
"Muñoz-Díaz",
"Jesús",
""
]
] | We give a variational formulation of perfect fluids on a general pseudoriemannian manifold by variating tangent fields according the flux produced by them. In this approach no constraints are needed. As a result, Euler and continuity equations are obtained quite directly. |
0709.0940 | Kazuhiro Hayama | Kazuhiro Hayama, Soumya D. Mohanty, Malik Rakhmanov, Shantanu Desai | Coherent network analysis for triggered gravitational wave burst
searches | to appear on Classical & Quantum Gravity | Class.Quant.Grav.24:S681-S688,2007 | 10.1088/0264-9381/24/19/S30 | null | gr-qc | null | Searches for gravitational wave bursts that are triggered by the observation
of astronomical events require a different mode of analysis than all-sky, blind
searches. For one, much more prior information is usually available in a
triggered search which can and should be used in the analysis. Second, since
the data vo... | [
{
"created": "Thu, 6 Sep 2007 18:53:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hayama",
"Kazuhiro",
""
],
[
"Mohanty",
"Soumya D.",
""
],
[
"Rakhmanov",
"Malik",
""
],
[
"Desai",
"Shantanu",
""
]
] | Searches for gravitational wave bursts that are triggered by the observation of astronomical events require a different mode of analysis than all-sky, blind searches. For one, much more prior information is usually available in a triggered search which can and should be used in the analysis. Second, since the data volu... |
0903.2789 | Babak Vakili | Babak Vakili | Deformed phase space and canonical quantum cosmology | 4 pages, Prepared for the proceedings of JGRG18 (Hiroshima, Japan,
17-21 November 2008), this is a short report of the previous works: arXiv:
0706.0273 and arXiv: gr-qc/0701075 | Proc. JGRG18 (2008) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of noncommutativity and deformed Heisenberg algebra on the
evolution of a two dimensional minisuperspace quantum cosmological model are
investigated.
| [
{
"created": "Mon, 16 Mar 2009 16:05:47 GMT",
"version": "v1"
}
] | 2009-10-17 | [
[
"Vakili",
"Babak",
""
]
] | The effects of noncommutativity and deformed Heisenberg algebra on the evolution of a two dimensional minisuperspace quantum cosmological model are investigated. |
gr-qc/9906008 | Francis Vendrell | F. Vendrell | Quantum mechanical path integrals and thermal radiation in static curved
spacetimes | 22 pages, 10 figures | Phys.Rev. D61 (2000) 044019 | 10.1103/PhysRevD.61.044019 | Imperial/TP/98-99/38, UGVA-DPT-1999/05-1041 | gr-qc hep-th quant-ph | null | The propagator of a spinless particle is calculated from the quantum
mechanical path integral formalism in static curved spacetimes endowed with
event-horizons. A toy model, the Gui spacetime, and the 2D and 4D Schwarzschild
black holes are considered. The role of the topology of the coordinates
configuration space i... | [
{
"created": "Thu, 3 Jun 1999 09:01:27 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Vendrell",
"F.",
""
]
] | The propagator of a spinless particle is calculated from the quantum mechanical path integral formalism in static curved spacetimes endowed with event-horizons. A toy model, the Gui spacetime, and the 2D and 4D Schwarzschild black holes are considered. The role of the topology of the coordinates configuration space is ... |
0905.3804 | Kirill Bronnikov | K.A. Bronnikov, S.V. Chervon, S.V. Sushkov | Wormholes supported by chiral fields | 5 two-column pages, to appear in Grav. Cosmol | Grav.Cosmol.15:241-246,2009 | 10.1134/S0202289309030074 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider static, spherically symmetric solutions of general relativity
with a nonlinear sigma model (NSM) as a source, i.e., a set of scalar fields
$\Phi = (\Phi^1,...,\Phi^n)$ (so-called chiral fields) parametrizing a target
space with a metric $h_{ab}(\Phi)$. For NSM with zero potential $V(\Phi)$, it
is shown th... | [
{
"created": "Sat, 23 May 2009 09:45:12 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Chervon",
"S. V.",
""
],
[
"Sushkov",
"S. V.",
""
]
] | We consider static, spherically symmetric solutions of general relativity with a nonlinear sigma model (NSM) as a source, i.e., a set of scalar fields $\Phi = (\Phi^1,...,\Phi^n)$ (so-called chiral fields) parametrizing a target space with a metric $h_{ab}(\Phi)$. For NSM with zero potential $V(\Phi)$, it is shown that... |
2005.09454 | Sunandan Gangopadhyay | Sukanta Bhattacharyya, Sunandan Gangopadhyay, Anirban Saha | Generalized uncertainty principle in resonant detectors of gravitational
waves | 12 pages Latex, thoroughly revised | Class. Quantum Grav. 37 (2020) 195006 (14pp) | 10.1088/1361-6382/abac45 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the direct detection of gravitational waves by advanced LIGO detector, a
new "window" to quantum gravity phenomenology has been opened. At present,
these detectors achieve the sensitivity to detect the length variation ($\delta
L$), $\mathcal{O} \approx 10^{-17}-10^{-21}$ meter. Recently a more stringent
upperbo... | [
{
"created": "Mon, 18 May 2020 04:47:33 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2020 05:04:11 GMT",
"version": "v2"
}
] | 2020-09-11 | [
[
"Bhattacharyya",
"Sukanta",
""
],
[
"Gangopadhyay",
"Sunandan",
""
],
[
"Saha",
"Anirban",
""
]
] | With the direct detection of gravitational waves by advanced LIGO detector, a new "window" to quantum gravity phenomenology has been opened. At present, these detectors achieve the sensitivity to detect the length variation ($\delta L$), $\mathcal{O} \approx 10^{-17}-10^{-21}$ meter. Recently a more stringent upperboun... |
2305.10470 | David Derbes | Freeman J. Dyson | Gravitational Machines | 4 pages, one figure | null | null | null | gr-qc astro-ph.SR physics.hist-ph physics.pop-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | A gravitational machine is defined as an arrangement of gravitating masses
from which useful energy can be extracted. It is shown that such machines may
exist if the masses are of normal astronomical size. A simple example of a
gravitational machine, consisting of a double star with smaller masses orbiting
around it,... | [
{
"created": "Wed, 17 May 2023 14:52:13 GMT",
"version": "v1"
}
] | 2023-05-19 | [
[
"Dyson",
"Freeman J.",
""
]
] | A gravitational machine is defined as an arrangement of gravitating masses from which useful energy can be extracted. It is shown that such machines may exist if the masses are of normal astronomical size. A simple example of a gravitational machine, consisting of a double star with smaller masses orbiting around it, i... |
2208.10831 | Jian-Dong Zhang | Ning Xie, Jian-dong Zhang, Shun-Jia Huang, Yi-Ming Hu, Jianwei Mei | Constraining the Extra Polarization Modes of Gravitational Waves with
Double White Dwarfs | 13 pages, 18 figures, 5 tables, matches the published version | PhysRevD.106.124017 (2022) | 10.1103/PhysRevD.106.124017 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The detection of gravitational wave (GW) has opened a new window to test the
theory of gravity in the strong field regime. In general relativity (GR), GW
can only possess two tensor polarization modes, which are known as the $+$ and
$\times$ modes. However, vector and scalar modes can exist in some modified
theories ... | [
{
"created": "Tue, 23 Aug 2022 09:27:41 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2023 03:30:16 GMT",
"version": "v2"
}
] | 2023-02-20 | [
[
"Xie",
"Ning",
""
],
[
"Zhang",
"Jian-dong",
""
],
[
"Huang",
"Shun-Jia",
""
],
[
"Hu",
"Yi-Ming",
""
],
[
"Mei",
"Jianwei",
""
]
] | The detection of gravitational wave (GW) has opened a new window to test the theory of gravity in the strong field regime. In general relativity (GR), GW can only possess two tensor polarization modes, which are known as the $+$ and $\times$ modes. However, vector and scalar modes can exist in some modified theories of... |
2110.05019 | Poulami Dutta Roy | Poulami Dutta Roy (IIT Kharagpur, India) | Novel triple barrier potential for axial gravitational perturbations of
a family of Lorentzian wormholes | 37 pages, 16 figures. Matches published version | null | 10.1140/epjc/s10052-022-10631-3 | null | gr-qc hep-th physics.class-ph | http://creativecommons.org/licenses/by/4.0/ | We study the behavior of a specific Lorentzian wormhole family under
gravitational perturbations. In earlier work [EPJC 80, 850 (2020)], we have
proved the stability of a test scalar field in the background of the wormhole
family, where the effective potential was that of a double barrier. Continuing
with the stabili... | [
{
"created": "Mon, 11 Oct 2021 06:12:44 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2022 10:16:30 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Aug 2022 12:04:18 GMT",
"version": "v3"
}
] | 2022-08-15 | [
[
"Roy",
"Poulami Dutta",
"",
"IIT Kharagpur, India"
]
] | We study the behavior of a specific Lorentzian wormhole family under gravitational perturbations. In earlier work [EPJC 80, 850 (2020)], we have proved the stability of a test scalar field in the background of the wormhole family, where the effective potential was that of a double barrier. Continuing with the stability... |
2302.04272 | Alessia Benedetta Platania | Alessia Platania | Black Holes in Asymptotically Safe Gravity | 63 pages, 13 figures. Invited chapter for the "Handbook of Quantum
Gravity" (Eds. C. Bambi, L. Modesto and I.L. Shapiro, Springer Singapore).
V2: bibliography issue fixed, typos corrected. V3: matched the published
version | null | 10.1007/978-981-19-3079-9_24-1 | NORDITA 2022-085 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this chapter we review the state-of-the-art of black holes in
asymptotically safe gravity. After a brief recap of the asymptotic safety
program, we shall summarize the features of asymptotic-safety-inspired
black-hole models that have been constructed in the past by the so-called
renormalization group improvement.... | [
{
"created": "Wed, 8 Feb 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Mar 2023 16:36:39 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Feb 2024 00:18:42 GMT",
"version": "v3"
}
] | 2024-02-13 | [
[
"Platania",
"Alessia",
""
]
] | In this chapter we review the state-of-the-art of black holes in asymptotically safe gravity. After a brief recap of the asymptotic safety program, we shall summarize the features of asymptotic-safety-inspired black-hole models that have been constructed in the past by the so-called renormalization group improvement. S... |
1205.4468 | Pedro J Mora | P. J. Mora, N. C. Tsamis and R. P. Woodard | Graviton Propagator in a General Invariant Gauge on de Sitter | Uses Latex2e, 20 pages, no figures, no tables | null | 10.1063/1.4764882 | CCTP-2012-09; UFIFT-QC-12-05 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the graviton propagator on de Sitter background in the one
parameter family of exact, de Sitter invariant gauges. Our result takes the
form of a universal spin two part and a gauge dependent spin zero part. Scalar
equations are derived for the structure functions of each part. There is no de
Sitter invar... | [
{
"created": "Sun, 20 May 2012 22:22:47 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Mora",
"P. J.",
""
],
[
"Tsamis",
"N. C.",
""
],
[
"Woodard",
"R. P.",
""
]
] | We construct the graviton propagator on de Sitter background in the one parameter family of exact, de Sitter invariant gauges. Our result takes the form of a universal spin two part and a gauge dependent spin zero part. Scalar equations are derived for the structure functions of each part. There is no de Sitter invaria... |
2210.09429 | Luis Gabriel Gomez Diaz PhD | Gabriel G\'omez, Guillermo Palma, \'Angel Rinc\'on, Norman Cruz,
Esteban Gonz\'alez | A new Parametrization for Bulk Viscosity Cosmology as Extension of the
$\Lambda$CDM Model | 26 pages, 6 figures. Typos fixed, phase space diagrams included
(figure 1). Accepted for publication in the European Physical Journal Plus | Eur. Phys. J. Plus (2023) 138:738 | 10.1140/epjp/s13360-023-04367-6 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Bulk viscosity in cold dark matter is an appealing feature that introduces
distinctive phenomenological effects in the cosmological setting as compared to
the $\Lambda$CDM model. Under this view, we propose a general parametrization
of the bulk viscosity of the form $\xi\sim H^{1-2s} \rho_{m}^{s}$, that covers
intrig... | [
{
"created": "Mon, 17 Oct 2022 20:46:24 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2023 15:34:41 GMT",
"version": "v2"
}
] | 2023-08-24 | [
[
"Gómez",
"Gabriel",
""
],
[
"Palma",
"Guillermo",
""
],
[
"Rincón",
"Ángel",
""
],
[
"Cruz",
"Norman",
""
],
[
"González",
"Esteban",
""
]
] | Bulk viscosity in cold dark matter is an appealing feature that introduces distinctive phenomenological effects in the cosmological setting as compared to the $\Lambda$CDM model. Under this view, we propose a general parametrization of the bulk viscosity of the form $\xi\sim H^{1-2s} \rho_{m}^{s}$, that covers intrigui... |
gr-qc/0203012 | Alan D. Rendall | Alan D. Rendall | Theorems on existence and global dynamics for the Einstein equations | 54 pages, submitted to Living Reviews in Relativity | LivingRev.Rel.5:6,2002 | null | AEI-2002-017 | gr-qc | null | This article is a guide to theorems on existence and global dynamics of
solutions of the Einstein equations. It draws attention to open questions in
the field. The local in time Cauchy problem, which is relatively well
understood, is surveyed. Global results for solutions with various types of
symmetry are discussed.... | [
{
"created": "Mon, 4 Mar 2002 10:38:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rendall",
"Alan D.",
""
]
] | This article is a guide to theorems on existence and global dynamics of solutions of the Einstein equations. It draws attention to open questions in the field. The local in time Cauchy problem, which is relatively well understood, is surveyed. Global results for solutions with various types of symmetry are discussed. A... |
gr-qc/9702025 | Lee Smolin | Fotini Markopoulou and Lee Smolin | Causal evolution of spin networks | latex, 32 pages, 17 figures | Nucl.Phys.B508:409-430,1997 | 10.1016/S0550-3213(97)00488-4 | CGPG 97/2-1 | gr-qc hep-th | null | A new approach to quantum gravity is described which joins the loop
representation formulation of the canonical theory to the causal set
formulation of the path integral. The theory assigns quantum amplitudes to
special classes of causal sets, which consist of spin networks representing
quantum states of the gravitat... | [
{
"created": "Thu, 13 Feb 1997 22:52:48 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Markopoulou",
"Fotini",
""
],
[
"Smolin",
"Lee",
""
]
] | A new approach to quantum gravity is described which joins the loop representation formulation of the canonical theory to the causal set formulation of the path integral. The theory assigns quantum amplitudes to special classes of causal sets, which consist of spin networks representing quantum states of the gravitatio... |
gr-qc/0203088 | Laszlo A. Gergely | L\'aszl\'o \'A. Gergely, Zolt\'an Perj\'es | Kerr-Schild metrics revisited I. The ground state | 16 pages | J.Math.Phys. 35 (1994) 2438-2447 | 10.1063/1.530515 | preprint KFKI-1993-07/B | gr-qc | null | The Kerr-Schild pencil of metrics $g_{ab}+\La l_al_b$ is investigated in the
generic case when it maps an arbitrary vacuum space-time with metric $g_{ab}$
to a vacuum space-time. The theorem is proved that this generic case, with the
field $l$ shearing, does not contain the shear-free subclass as a smooth limit.
It i... | [
{
"created": "Tue, 26 Mar 2002 12:29:56 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gergely",
"László Á.",
""
],
[
"Perjés",
"Zoltán",
""
]
] | The Kerr-Schild pencil of metrics $g_{ab}+\La l_al_b$ is investigated in the generic case when it maps an arbitrary vacuum space-time with metric $g_{ab}$ to a vacuum space-time. The theorem is proved that this generic case, with the field $l$ shearing, does not contain the shear-free subclass as a smooth limit. It is ... |
2207.04076 | Mohsen Fathi | Mohsen Fathi, Marco Olivares, J.R. Villanueva | Spherical photon orbits around a rotating black hole with quintessence
and cloud of strings | 28 pages, 36 figures, 2 tables | Eur. Phys. J. Plus (2023) 138:7 | 10.1140/epjp/s13360-022-03538-1 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | In this paper, we calculate the analytical solutions for the radii of planar
and polar spherical photon orbits around a rotating black hole that is
associated with quintessential field and cloud of strings. This includes a full
analytical treatment of a quintic that describes orbits on the equatorial
plane. Furthermo... | [
{
"created": "Fri, 8 Jul 2022 18:07:37 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Nov 2022 16:19:07 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Jan 2023 12:49:33 GMT",
"version": "v3"
}
] | 2023-01-05 | [
[
"Fathi",
"Mohsen",
""
],
[
"Olivares",
"Marco",
""
],
[
"Villanueva",
"J. R.",
""
]
] | In this paper, we calculate the analytical solutions for the radii of planar and polar spherical photon orbits around a rotating black hole that is associated with quintessential field and cloud of strings. This includes a full analytical treatment of a quintic that describes orbits on the equatorial plane. Furthermore... |
gr-qc/9703013 | Kimberly New | Kimberly C. B. New (Drexel University) and Joel E. Tohline (Louisiana
State University) | The Relative Stability Against Merger of Close, Compact Binaries | 29 pages (AASTeX4.0) & 16 figures [in 24 eps files]; more direct
comparison with results of previous authors, discussion of secular-type
evolution of stable models added; accepted for publication in The
Astrophysical Journal | Astrophys.J. 490 (1997) 311-327 | 10.1086/304861 | null | gr-qc astro-ph | null | The orbital separation of compact binary stars will shrink with time due to
the emission of gravitational radiation. This inspiralling phase of a binary
system's evolution generally will be very long compared to the system's orbital
period, but the final coalescence may be dynamical and driven to a large degree
by hy... | [
{
"created": "Wed, 5 Mar 1997 15:55:01 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jun 1997 16:04:06 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"New",
"Kimberly C. B.",
"",
"Drexel University"
],
[
"Tohline",
"Joel E.",
"",
"Louisiana\n State University"
]
] | The orbital separation of compact binary stars will shrink with time due to the emission of gravitational radiation. This inspiralling phase of a binary system's evolution generally will be very long compared to the system's orbital period, but the final coalescence may be dynamical and driven to a large degree by hydr... |
gr-qc/0508043 | Boris Hikin L | Boris Hikin | Tensor Potential Description of Matter and Space | 33 pages | null | null | null | gr-qc | null | A unified field theory for the description of matter in a curved space is
discussed. The description is based on a standard Lagrangianian formalism in a
pseudo-Euclidian 4D continuum using a 3-index tensor as independent variables.
The theory defines gravitational matter as a vector field and contains the
Einstein-Sc... | [
{
"created": "Wed, 10 Aug 2005 18:58:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hikin",
"Boris",
""
]
] | A unified field theory for the description of matter in a curved space is discussed. The description is based on a standard Lagrangianian formalism in a pseudo-Euclidian 4D continuum using a 3-index tensor as independent variables. The theory defines gravitational matter as a vector field and contains the Einstein-Schw... |
gr-qc/0010023 | Wolfgang Kummer | Wolfgang Kummer | 2d quantum gravity with torsion, dilaton theory and black hole formation | 10 pages, to be published in Proceedings of the 9th Marcel Grossmann
Conference, Rome, 2-8 July 2000 | null | null | TUW-00-25 | gr-qc | null | Starting from the work of the author in 1990 with different collaborators,
essential progress in 2d gravity theories has been made. Now all such theories
(and not only certain special models) can be treated at the classical as well
as at the quantum level. New physical insights have been obtained, as e.g. the
``virtu... | [
{
"created": "Fri, 6 Oct 2000 11:34:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kummer",
"Wolfgang",
""
]
] | Starting from the work of the author in 1990 with different collaborators, essential progress in 2d gravity theories has been made. Now all such theories (and not only certain special models) can be treated at the classical as well as at the quantum level. New physical insights have been obtained, as e.g. the ``virtual... |
gr-qc/0609036 | Alberto Saa | Elcio Abdalla, Cecilia B. M. H. Chirenti, and Alberto Saa | Quasinormal modes for the Vaidya metric | V2: 6 pages, 5 figures | Phys.Rev. D74 (2006) 084029 | 10.1103/PhysRevD.74.084029 | null | gr-qc | null | We consider here scalar and electromagnetic perturbations for the Vaidya
metric in double-null coordinates. Such an approach allows one to go a step
further in the analysis of quasinormal modes for time-dependent spacetimes.
Some recent results are refined, and a new non-stationary behavior
corresponding to some sort... | [
{
"created": "Sat, 9 Sep 2006 13:47:48 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Oct 2006 19:23:38 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Abdalla",
"Elcio",
""
],
[
"Chirenti",
"Cecilia B. M. H.",
""
],
[
"Saa",
"Alberto",
""
]
] | We consider here scalar and electromagnetic perturbations for the Vaidya metric in double-null coordinates. Such an approach allows one to go a step further in the analysis of quasinormal modes for time-dependent spacetimes. Some recent results are refined, and a new non-stationary behavior corresponding to some sort o... |
1010.1587 | Robert Thompson | Robert T. Thompson and J\"org Frauendiener | Dielectric Analog Space-Times | 10 pages, 1 figure. This version: Typos corrected, 1 reference added,
updated citation information, minor correction to Equation 41 | Phys.Rev.D82:124021,2010 | 10.1103/PhysRevD.82.124021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the notion of a dielectric analog Schwarzschild black hole
model to analog models of arbitrary space-times; in particular, the approach is
not restricted to static space-times. This is done by establishing a
correspondence between electrodynamics on a curved, vacuum manifold, with
electrodynamics in a g... | [
{
"created": "Fri, 8 Oct 2010 04:14:20 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jan 2011 02:46:54 GMT",
"version": "v2"
}
] | 2011-01-20 | [
[
"Thompson",
"Robert T.",
""
],
[
"Frauendiener",
"Jörg",
""
]
] | We generalize the notion of a dielectric analog Schwarzschild black hole model to analog models of arbitrary space-times; in particular, the approach is not restricted to static space-times. This is done by establishing a correspondence between electrodynamics on a curved, vacuum manifold, with electrodynamics in a gen... |
2110.14926 | Matt Visser | Matt Visser, Jessica Santiago, and Sebastian Schuster | Tractor beams, pressor beams, and stressor beams within the context of
general relativity | 14 pages; Contribution to the Sixteenth Marcel Grossman Conference
(MG16, Rome, July, 2021) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Both traversable wormholes and warp drives, concepts originally developed
within the context of science fiction, have now (for some 30 odd years) been
studied, debated, and carefully analyzed within the framework of general
relativity. An overarching theme of the general relativistic analysis is
unavoidable violation... | [
{
"created": "Thu, 28 Oct 2021 07:20:27 GMT",
"version": "v1"
}
] | 2021-10-29 | [
[
"Visser",
"Matt",
""
],
[
"Santiago",
"Jessica",
""
],
[
"Schuster",
"Sebastian",
""
]
] | Both traversable wormholes and warp drives, concepts originally developed within the context of science fiction, have now (for some 30 odd years) been studied, debated, and carefully analyzed within the framework of general relativity. An overarching theme of the general relativistic analysis is unavoidable violations ... |
2305.12155 | Khireddine Nouicer | Youcef Kehal, Khireddine Nouicer and Hamza Boumaza | Neutron Stars in Scalar Torsion Theories with Nonminimal Coupling | 25 pages, 6 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the existence and structure of static and slowly rotating neutron
stars (NSs) in a particular truncation of scalar torsion theory with a scalar
field $ \phi $ non-minimally coupled to the torsion scalar, and a potential of
the form $ V(\phi)=-\mu^2\phi^2/2 +\lambda \phi^4 /4 $. We derive the
hydrostatic equi... | [
{
"created": "Sat, 20 May 2023 09:58:39 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 2023 13:37:10 GMT",
"version": "v2"
}
] | 2023-11-27 | [
[
"Kehal",
"Youcef",
""
],
[
"Nouicer",
"Khireddine",
""
],
[
"Boumaza",
"Hamza",
""
]
] | We study the existence and structure of static and slowly rotating neutron stars (NSs) in a particular truncation of scalar torsion theory with a scalar field $ \phi $ non-minimally coupled to the torsion scalar, and a potential of the form $ V(\phi)=-\mu^2\phi^2/2 +\lambda \phi^4 /4 $. We derive the hydrostatic equili... |
2205.04231 | Siddheshwar Kadam | S.A. Kadam, B. Mishra, Jackson Levi Said | Teleparallel scalar-tensor gravity through cosmological dynamical
systems | 26 pages, 8 figures | Eur. Phys. J. C (2022) 82:680 | 10.48550/arXiv.2205.04231 10.1140/epjc/s10052-022-10648-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor theories offer the prospect of explaining the cosmological
evolution of the Universe through an effective description of dark energy as a
quantity with a non-trivial evolution. In this work, we investigate this
feature of scalar-tensor theories in the teleparallel gravity context.
Teleparallel gravity i... | [
{
"created": "Fri, 6 May 2022 06:32:27 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Aug 2022 04:59:05 GMT",
"version": "v2"
}
] | 2022-08-19 | [
[
"Kadam",
"S. A.",
""
],
[
"Mishra",
"B.",
""
],
[
"Said",
"Jackson Levi",
""
]
] | Scalar-tensor theories offer the prospect of explaining the cosmological evolution of the Universe through an effective description of dark energy as a quantity with a non-trivial evolution. In this work, we investigate this feature of scalar-tensor theories in the teleparallel gravity context. Teleparallel gravity is ... |
1709.09630 | Luke Bovard | Luke Bovard, Dirk Martin, Federico Guercilena, Almudena Arcones,
Luciano Rezzolla, Oleg Korobkin | On r-process nucleosynthesis from matter ejected in binary neutron
starmergers | 24 pages, 18 figures, submitted to PRD | Phys. Rev. D 96, 124005 (2017) | 10.1103/PhysRevD.96.124005 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When binary systems of neutron stars merge, a very small fraction of their
rest mass is ejected, either dynamically or secularly. This material is
neutron-rich and its nucleosynthesis could provide the astrophysical site for
the production of heavy elements in the universe, together with a kilonova
signal confirming ... | [
{
"created": "Wed, 27 Sep 2017 17:13:45 GMT",
"version": "v1"
}
] | 2017-12-13 | [
[
"Bovard",
"Luke",
""
],
[
"Martin",
"Dirk",
""
],
[
"Guercilena",
"Federico",
""
],
[
"Arcones",
"Almudena",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Korobkin",
"Oleg",
""
]
] | When binary systems of neutron stars merge, a very small fraction of their rest mass is ejected, either dynamically or secularly. This material is neutron-rich and its nucleosynthesis could provide the astrophysical site for the production of heavy elements in the universe, together with a kilonova signal confirming ne... |
gr-qc/0512109 | Karel Van Acoleyen | Ignacio Navarro and Karel Van Acoleyen | Modified gravity, Dark Energy and MOND | 24 pages, 2 figures. References and comments on the external field
effect added in subsect. 3.3.3 | JCAP 0609 (2006) 006 | 10.1088/1475-7516/2006/09/006 | DAMTP-2005-129, DCPT/05/154, IPPP/05/77 | gr-qc astro-ph hep-th | null | We propose a class of actions for the spacetime metric that introduce
corrections to the Einstein-Hilbert Lagrangian depending on the logarithm of
some curvature scalars. We show that for some choices of these invariants the
models are ghost free and modify Newtonian gravity below a characteristic
acceleration scale ... | [
{
"created": "Tue, 20 Dec 2005 15:08:54 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jan 2006 17:55:20 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Navarro",
"Ignacio",
""
],
[
"Van Acoleyen",
"Karel",
""
]
] | We propose a class of actions for the spacetime metric that introduce corrections to the Einstein-Hilbert Lagrangian depending on the logarithm of some curvature scalars. We show that for some choices of these invariants the models are ghost free and modify Newtonian gravity below a characteristic acceleration scale gi... |
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