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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2110.05920 | Joao Magueijo | Joao Magueijo | Connection between cosmological time and the constants of Nature | Version to be published in Physical Review D | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We examine in greater detail the proposal that time is the conjugate of the
constants of nature. Fundamentally distinct times are associated with different
constants, a situation often found in "relational time" settings. We show in
detail how in regions dominated by a single constant the Hamiltonian constraint
can b... | [
{
"created": "Tue, 12 Oct 2021 12:05:47 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Mar 2022 14:41:32 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Mar 2022 09:19:17 GMT",
"version": "v3"
},
{
"created": "Tue, 11 Oct 2022 16:09:21 GMT",
"version": "v4"
}
] | 2022-10-14 | [
[
"Magueijo",
"Joao",
""
]
] | We examine in greater detail the proposal that time is the conjugate of the constants of nature. Fundamentally distinct times are associated with different constants, a situation often found in "relational time" settings. We show in detail how in regions dominated by a single constant the Hamiltonian constraint can be ... |
1512.00605 | Norbert Bodendorfer | Norbert Bodendorfer | A note on conformally compactified connection dynamics tailored for
anti-de Sitter space | 8 pages; v2: journal version, title changed, minor clarifications and
comments added | Class. Quantum Grav. 33 (2016) 237002 | 10.1088/0264-9381/33/23/237002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A framework conceptually based on the conformal techniques employed to study
the structure of the gravitational field at infinity is set up in the context
of loop quantum gravity to describe asymptotically anti-de Sitter quantum
spacetimes. A conformal compactification of the spatial slice is performed,
which, in ter... | [
{
"created": "Wed, 2 Dec 2015 08:22:18 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2016 11:07:54 GMT",
"version": "v2"
}
] | 2016-11-30 | [
[
"Bodendorfer",
"Norbert",
""
]
] | A framework conceptually based on the conformal techniques employed to study the structure of the gravitational field at infinity is set up in the context of loop quantum gravity to describe asymptotically anti-de Sitter quantum spacetimes. A conformal compactification of the spatial slice is performed, which, in terms... |
gr-qc/9812038 | Fernando Lombardo | Fernando C. Lombardo | Quantum to classical transition in quantum field theory | 127 pages, LaTex, 8 figures. PhD Thesis, University of Buenos Aires
(in Spanish) | null | null | null | gr-qc hep-th | null | We study the quatum to classical transition process in the context of quantum
field theory. Extending the influence functional formalism of Feynman and
Vernon, we study the decoherence process for self-interacting quantum fields in
flat space. We also use this formalism for arbitrary geometries to analyze the
quantum... | [
{
"created": "Fri, 11 Dec 1998 15:03:11 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Lombardo",
"Fernando C.",
""
]
] | We study the quatum to classical transition process in the context of quantum field theory. Extending the influence functional formalism of Feynman and Vernon, we study the decoherence process for self-interacting quantum fields in flat space. We also use this formalism for arbitrary geometries to analyze the quantum t... |
1009.3093 | Shayeste Ghaffari | K. Karami, A. Sheykhi, N. Sahraei, S. Ghaffari | Generalized second law of thermodynamics in modified FRW cosmology with
corrected entropy-area relation | 9 pages, accepted for publication in Europhysics Letters | Europhys.Lett.93:29002,2011 | 10.1209/0295-5075/93/29002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the corrected entropy-area relation motivated by the loop quantum
gravity, we investigate the validity of the generalized second law of
thermodynamics in the framework of modified FRW cosmology. We consider a
non-flat universe filled with an interacting viscous dark energy with dark
matter and radiation. The bo... | [
{
"created": "Thu, 16 Sep 2010 05:49:36 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jan 2011 10:14:38 GMT",
"version": "v2"
}
] | 2011-04-21 | [
[
"Karami",
"K.",
""
],
[
"Sheykhi",
"A.",
""
],
[
"Sahraei",
"N.",
""
],
[
"Ghaffari",
"S.",
""
]
] | Using the corrected entropy-area relation motivated by the loop quantum gravity, we investigate the validity of the generalized second law of thermodynamics in the framework of modified FRW cosmology. We consider a non-flat universe filled with an interacting viscous dark energy with dark matter and radiation. The boun... |
2306.13044 | Jose M. Isidro | P. Fernandez de Cordoba, J.M. Isidro, Rudranil Roy | Spacetime metric from quantum-gravity corrected Feynman propagators | Refs. added, some clarifications made | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Differentiation of the scalar Feynman propagator with respect to the
spacetime coordinates yields the metric on the background spacetime that the
scalar particle propagates in. Now Feynman propagators can be modified in order
to include quantum-gravity corrections as induced by a zero-point length $L>0$.
These correc... | [
{
"created": "Thu, 22 Jun 2023 17:11:11 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2023 19:04:56 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jan 2024 15:06:31 GMT",
"version": "v3"
}
] | 2024-01-18 | [
[
"de Cordoba",
"P. Fernandez",
""
],
[
"Isidro",
"J. M.",
""
],
[
"Roy",
"Rudranil",
""
]
] | Differentiation of the scalar Feynman propagator with respect to the spacetime coordinates yields the metric on the background spacetime that the scalar particle propagates in. Now Feynman propagators can be modified in order to include quantum-gravity corrections as induced by a zero-point length $L>0$. These correcti... |
0903.4757 | Belinch\'on Jos\'e Antonio | Jos\'e Antonio Belinch\'on | Massive cosmic strings in Bianchi type II | 7 pages, RevTeX | Astrophys. Space Sci. 323, 307, (2009) | 10.1007/s10509-009-0065-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a massive cosmic strings with BII symmetries cosmological models in
two contexts. The first of them is the standard one with a barotropic equation
of state. In the second one we explore the possibility of taking into account
variable \textquotedblleft constants\textquotedblright ($G$ and $\Lambda
).$Both mod... | [
{
"created": "Fri, 27 Mar 2009 10:01:22 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Belinchón",
"José Antonio",
""
]
] | We study a massive cosmic strings with BII symmetries cosmological models in two contexts. The first of them is the standard one with a barotropic equation of state. In the second one we explore the possibility of taking into account variable \textquotedblleft constants\textquotedblright ($G$ and $\Lambda ).$Both model... |
2311.03656 | Ryan Magee | Ryan Magee, Maximiliano Isi, Ethan Payne, Katerina Chatziioannou, Will
M. Farr, Geraint Pratten, and Salvatore Vitale | The impact of selection biases on tests of general relativity with
gravitational-wave inspirals | null | null | 10.1103/PhysRevD.109.023014 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Tests of general relativity with gravitational wave observations from merging
compact binaries continue to confirm Einstein's theory of gravity with
increasing precision. However, these tests have so far only been applied to
signals that were first confidently detected by matched-filter searches
assuming general rela... | [
{
"created": "Tue, 7 Nov 2023 01:58:12 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jan 2024 15:07:34 GMT",
"version": "v2"
}
] | 2024-01-29 | [
[
"Magee",
"Ryan",
""
],
[
"Isi",
"Maximiliano",
""
],
[
"Payne",
"Ethan",
""
],
[
"Chatziioannou",
"Katerina",
""
],
[
"Farr",
"Will M.",
""
],
[
"Pratten",
"Geraint",
""
],
[
"Vitale",
"Salvatore",
""
]
] | Tests of general relativity with gravitational wave observations from merging compact binaries continue to confirm Einstein's theory of gravity with increasing precision. However, these tests have so far only been applied to signals that were first confidently detected by matched-filter searches assuming general relati... |
1311.5915 | Emmanuil Saridakis | Spyros Basilakos (RCAAM, Academy of Athens), Alexandros P. Kouretsis
(Aristotle U., Thessaloniki), Emmanuel N. Saridakis (Natl. Tech. U., Athens
and Valparaiso U., Catolica), Panayiotis Stavrinos (Athens U.) | Resembling dark energy and modified gravity with Finsler-Randers
cosmology | 12 pages, accepted for publication at Phys. Rev. D | Phys. Rev. D 88 (2013) 123510 | 10.1103/PhysRevD.88.123510 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we present the cosmological equivalence between the
relativistic Finsler-Randers cosmology, with dark energy and modified gravity
constructions, at the background level. Starting from a small deviation from
the quadraticity of the Riemannian geometry, through which the local structure
of General Relat... | [
{
"created": "Thu, 21 Nov 2013 19:36:03 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Dec 2013 15:41:17 GMT",
"version": "v2"
}
] | 2013-12-17 | [
[
"Basilakos",
"Spyros",
"",
"RCAAM, Academy of Athens"
],
[
"Kouretsis",
"Alexandros P.",
"",
"Aristotle U., Thessaloniki"
],
[
"Saridakis",
"Emmanuel N.",
"",
"Natl. Tech. U., Athens\n and Valparaiso U., Catolica"
],
[
"Stavrinos",
"Panayiotis",... | In this article we present the cosmological equivalence between the relativistic Finsler-Randers cosmology, with dark energy and modified gravity constructions, at the background level. Starting from a small deviation from the quadraticity of the Riemannian geometry, through which the local structure of General Relativ... |
gr-qc/9811095 | Luis Lehner | Luis Lehner | A dissipative algorithm for wave-like equations in the characteristic
formulation | 23 pages, 7 figures | null | 10.1006/jcph.1998.6137 | null | gr-qc | null | We present a dissipative algorithm for solving nonlinear wave-like equations
when the initial data is specified on characteristic surfaces. The dissipative
properties built in this algorithm make it particularly useful when studying
the highly nonlinear regime where previous methods have failed to give a stable
evolu... | [
{
"created": "Mon, 30 Nov 1998 15:56:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lehner",
"Luis",
""
]
] | We present a dissipative algorithm for solving nonlinear wave-like equations when the initial data is specified on characteristic surfaces. The dissipative properties built in this algorithm make it particularly useful when studying the highly nonlinear regime where previous methods have failed to give a stable evoluti... |
gr-qc/0106095 | Jonathan Halliwell | J.J.Halliwell and J.Thorwart | Decoherent histories analysis of the relativistic particle | 51 pages, plain Tex | Phys.Rev. D64 (2001) 124018 | 10.1103/PhysRevD.64.124018 | Imperial College preprint TP/0-01/20 | gr-qc | null | The Klein-Gordon equation is a useful test arena for quantum cosmological
models described by the Wheeler-DeWitt equation. We use the decoherent
histories approach to quantum theory to obtain the probability that a free
relativistic particle crosses a section of spacelike surface. The decoherence
functional is constr... | [
{
"created": "Fri, 29 Jun 2001 13:26:34 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2001 14:01:48 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Halliwell",
"J. J.",
""
],
[
"Thorwart",
"J.",
""
]
] | The Klein-Gordon equation is a useful test arena for quantum cosmological models described by the Wheeler-DeWitt equation. We use the decoherent histories approach to quantum theory to obtain the probability that a free relativistic particle crosses a section of spacelike surface. The decoherence functional is construc... |
1209.1257 | Abhijnan Rej | Abhijnan Rej | Dimension, Divergence and Desingularization | A lightly-edited version of a submission to the 2012 FQXi Essay
Contest | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I argue that consistent geometrical descriptions of the universe are far from
unique even as low-energy limits and that an abstract "atomic" description of
spacetime and gauge-theoretic geometry in terms of K-theories of algebraic and
analytic cycles has the promise to restore uniqueness to our description.
| [
{
"created": "Thu, 6 Sep 2012 11:29:16 GMT",
"version": "v1"
}
] | 2012-09-07 | [
[
"Rej",
"Abhijnan",
""
]
] | I argue that consistent geometrical descriptions of the universe are far from unique even as low-energy limits and that an abstract "atomic" description of spacetime and gauge-theoretic geometry in terms of K-theories of algebraic and analytic cycles has the promise to restore uniqueness to our description. |
2301.02881 | Juan M. Z\'arate Pretel | Juan M. Z. Pretel | Moment of inertia of slowly rotating anisotropic neutron stars in
$f(R,T)$ gravity | 9 pages, 5 figures | Mod. Phys. Lett. A 37 (2022) 2250188 | 10.1142/S0217732322501887 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of $f(R,T)$ theories of gravity, we investigate the
hydrostatic equilibrium of anisotropic neutron stars with a physically relevant
equation of state (EoS) for the radial pressure. In particular, we focus on the
$f(R,T) = R+ 2\beta T$ model, where $\beta$ is a minimal coupling constant. In
the sl... | [
{
"created": "Sat, 7 Jan 2023 16:02:39 GMT",
"version": "v1"
}
] | 2023-01-10 | [
[
"Pretel",
"Juan M. Z.",
""
]
] | Within the framework of $f(R,T)$ theories of gravity, we investigate the hydrostatic equilibrium of anisotropic neutron stars with a physically relevant equation of state (EoS) for the radial pressure. In particular, we focus on the $f(R,T) = R+ 2\beta T$ model, where $\beta$ is a minimal coupling constant. In the slow... |
2302.13333 | Serge Parnovsky | S L Parnovsky | Can black holes be a source of dark energy? | 6 pages | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hypothesis that the mass of black holes increases with time according to
the same law as the volume of the part of the Universe containing it and
therefore the population of BHs is similar to dark energy in its action was
recently proposed. We demonstrate the reasons why it cannot be accepted, even
if all the ass... | [
{
"created": "Sun, 26 Feb 2023 15:18:58 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Mar 2023 20:10:07 GMT",
"version": "v2"
}
] | 2023-03-28 | [
[
"Parnovsky",
"S L",
""
]
] | The hypothesis that the mass of black holes increases with time according to the same law as the volume of the part of the Universe containing it and therefore the population of BHs is similar to dark energy in its action was recently proposed. We demonstrate the reasons why it cannot be accepted, even if all the assum... |
1803.09534 | Daniela Doneva | Stoytcho S. Yazadjiev, Daniela D. Doneva, Kostas D. Kokkotas | Tidal Love numbers of neutron stars in $f(R)$ gravity | 10 pages, 3 figures | null | 10.1140/epjc/s10052-018-6285-z | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent detection of gravitational waves from a neutron star merger was a
significant step towards constraining the nuclear matter equation of state by
using the tidal Love numbers (TLNs) of the merging neutron stars. Measuring or
constraining the neutron star TLNs allows us in principle to exclude or
constraint m... | [
{
"created": "Mon, 26 Mar 2018 12:03:31 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | The recent detection of gravitational waves from a neutron star merger was a significant step towards constraining the nuclear matter equation of state by using the tidal Love numbers (TLNs) of the merging neutron stars. Measuring or constraining the neutron star TLNs allows us in principle to exclude or constraint man... |
1310.0627 | Hirotada Okawa | Masaru Shibata, Keisuke Taniguchi, Hirotada Okawa, Alessandra Buonanno | Coalescence of binary neutron stars in a scalar-tensor theory of gravity | 17 pages, 12 figures | null | 10.1103/PhysRevD.89.084005 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We carry out numerical-relativity simulations of coalescing binary neutron
stars in a scalar-tensor theory that admits spontaneous scalarization. We model
neutron stars with realistic equations of state. We choose the free parameters
of the theory taking into account the constraints imposed by the latest
observations... | [
{
"created": "Wed, 2 Oct 2013 09:10:30 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Oct 2013 10:34:54 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Shibata",
"Masaru",
""
],
[
"Taniguchi",
"Keisuke",
""
],
[
"Okawa",
"Hirotada",
""
],
[
"Buonanno",
"Alessandra",
""
]
] | We carry out numerical-relativity simulations of coalescing binary neutron stars in a scalar-tensor theory that admits spontaneous scalarization. We model neutron stars with realistic equations of state. We choose the free parameters of the theory taking into account the constraints imposed by the latest observations o... |
2206.13062 | Arthur Touati | Arthur Touati | High-frequency solutions to the constraint equations | 36 pages, revised version after referee reports, accepted in
Communications in Mathematical Physics | null | 10.1007/s00220-023-04715-8 | null | gr-qc math.AP | http://creativecommons.org/licenses/by/4.0/ | We construct high-frequency initial data for the Einstein vacuum equations in
dimension 3+1 by solving the constraint equations on $\mathbb{R}^3$. Our family
of solutions $(\bar{g}_\lambda,K_\lambda)_{\lambda\in(0,1]}$ is defined through
a high-frequency expansion similar to the geometric optics approach and is
close... | [
{
"created": "Mon, 27 Jun 2022 06:06:07 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Apr 2023 12:36:49 GMT",
"version": "v2"
}
] | 2023-05-17 | [
[
"Touati",
"Arthur",
""
]
] | We construct high-frequency initial data for the Einstein vacuum equations in dimension 3+1 by solving the constraint equations on $\mathbb{R}^3$. Our family of solutions $(\bar{g}_\lambda,K_\lambda)_{\lambda\in(0,1]}$ is defined through a high-frequency expansion similar to the geometric optics approach and is close i... |
2111.09214 | Gregory Ashton | Gregory Ashton, Tim Dietrich | Understanding binary neutron star collisions with hypermodels | 10 pages, 5 figures, 1 table. Published Nature Astronomy | Nature Astronomy, Volume 6, p. 961-967 (2022) | 10.1038/s41550-022-01707-x | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves from the collision of binary neutron stars provide a
unique opportunity to study the behaviour of supranuclear matter, the
fundamental properties of gravity, and the cosmic history of our Universe.
However, given the complexity of Einstein's Field Equations, theoretical models
that enable source-p... | [
{
"created": "Wed, 17 Nov 2021 16:14:27 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2022 16:14:09 GMT",
"version": "v2"
}
] | 2022-11-02 | [
[
"Ashton",
"Gregory",
""
],
[
"Dietrich",
"Tim",
""
]
] | Gravitational waves from the collision of binary neutron stars provide a unique opportunity to study the behaviour of supranuclear matter, the fundamental properties of gravity, and the cosmic history of our Universe. However, given the complexity of Einstein's Field Equations, theoretical models that enable source-pro... |
1406.4526 | Edmund Schluessel | Edmund Schluessel | Propagation of gravitational waves in a universe with slowly-changing
equation of state | figures to be added later | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exact solution for the expansion of a flat universe with dark energy
evolving according to a simple model is explored. The equation for weak
primordial gravitational waves propagating in this universe is solved and
explored; gravitational waves in a flat cosmology possessing both a "big bang"
singularity and a "bi... | [
{
"created": "Tue, 17 Jun 2014 20:22:38 GMT",
"version": "v1"
}
] | 2014-06-19 | [
[
"Schluessel",
"Edmund",
""
]
] | An exact solution for the expansion of a flat universe with dark energy evolving according to a simple model is explored. The equation for weak primordial gravitational waves propagating in this universe is solved and explored; gravitational waves in a flat cosmology possessing both a "big bang" singularity and a "big ... |
0811.0629 | James Lindesay | Beth A. Brown and James Lindesay | Construction of a Penrose Diagram for an Accreting Black Hole | 7 pages, 1 figure | Class.Quant.Grav.26:045010,2009 | 10.1088/0264-9381/26/4/045010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Penrose diagram is constructed for a spatially coherent black hole that
accretes at stepwise steady rates as measured by a distant observer from an
initial state described by a metric of Minkowski form. Coordinate lines are
computationally derived, and radial light-like trajectories verify the
viability of the diag... | [
{
"created": "Tue, 4 Nov 2008 23:35:12 GMT",
"version": "v1"
}
] | 2009-02-09 | [
[
"Brown",
"Beth A.",
""
],
[
"Lindesay",
"James",
""
]
] | A Penrose diagram is constructed for a spatially coherent black hole that accretes at stepwise steady rates as measured by a distant observer from an initial state described by a metric of Minkowski form. Coordinate lines are computationally derived, and radial light-like trajectories verify the viability of the diagra... |
1611.07802 | Vicente Antunes | V. Antunes, I. Bediaga, M. Novello | Gravitational mechanism for baryogenesis in the cosmological QCD phase
transition | 14 pages, 4 figures, replacement with correct figures and captions | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the biggest puzzles in modern cosmology is the observed baryon
asymmetry in the universe. In current models of baryogenesis gravity plays a
secondary role, although the process is believed to have happened in the early
universe, under the influence of an intense gravitational field. In the present
work we resu... | [
{
"created": "Wed, 23 Nov 2016 14:01:25 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Nov 2016 18:29:14 GMT",
"version": "v2"
}
] | 2016-11-28 | [
[
"Antunes",
"V.",
""
],
[
"Bediaga",
"I.",
""
],
[
"Novello",
"M.",
""
]
] | One of the biggest puzzles in modern cosmology is the observed baryon asymmetry in the universe. In current models of baryogenesis gravity plays a secondary role, although the process is believed to have happened in the early universe, under the influence of an intense gravitational field. In the present work we resume... |
1310.0780 | Nelson Videla Dr. | Ramon Herrera, Marco Olivares, and Nelson Videla | General dissipative coefficient in warm intermediate and logamediate
inflation | 29 pages, 9 figures | Physical Review D 88, 063535 (2013) | 10.1103/PhysRevD.88.063535 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a general form for the dissipative coefficient
$\Gamma(T,\phi)=C_\phi\,T^{m}/\phi^{m-1}$ in the context of warm intermediate
and logamediate inflationary universe models. We analyze these models in the
weak and strong dissipative regimes. In the slow-roll approximation, we
describe in great detail the charac... | [
{
"created": "Wed, 2 Oct 2013 17:31:17 GMT",
"version": "v1"
}
] | 2014-04-14 | [
[
"Herrera",
"Ramon",
""
],
[
"Olivares",
"Marco",
""
],
[
"Videla",
"Nelson",
""
]
] | We study a general form for the dissipative coefficient $\Gamma(T,\phi)=C_\phi\,T^{m}/\phi^{m-1}$ in the context of warm intermediate and logamediate inflationary universe models. We analyze these models in the weak and strong dissipative regimes. In the slow-roll approximation, we describe in great detail the characte... |
gr-qc/0201032 | P. A. Letelier | Bruno Boisseau and Patricio S. Letelier | Relativistic Multipoles and the Advance of the Perihelia | 28 pages, 2 figures, to appear in GRG | Gen.Rel.Grav. 34 (2002) 1077-1096 | 10.1023/A:1016566005478 | null | gr-qc | null | In order to shed some light in the meaning of the relativistic multipolar
expansions we consider different static solutions of the axially symmetric
vacuum Einstein equations that in the non relativistic limit have same
Newtonian moments. The motion of test particles orbiting around different
deformed attraction cent... | [
{
"created": "Thu, 10 Jan 2002 13:14:42 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Boisseau",
"Bruno",
""
],
[
"Letelier",
"Patricio S.",
""
]
] | In order to shed some light in the meaning of the relativistic multipolar expansions we consider different static solutions of the axially symmetric vacuum Einstein equations that in the non relativistic limit have same Newtonian moments. The motion of test particles orbiting around different deformed attraction center... |
0802.1757 | Myungseok Yoon | Wontae Kim, Edwin J. Son, and Myungseok Yoon | Thermodynamic similarity between the noncommutative Schwarzschild black
hole and the Reissner-Nordstr\"om black hole | 10 pages, 6 figures | JHEP0804:042,2008 | 10.1088/1126-6708/2008/04/042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study thermodynamic quantities and examine the stability of a black hole
in a cavity inspired by the noncommutative geometry. It turns out that
thermodynamic behavior of the noncommutative black hole is analogous to that of
the Reissner-Nordstr\"om black hole in the near extremal limit. Moreover, we
identify the n... | [
{
"created": "Wed, 13 Feb 2008 03:20:39 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Sep 2009 09:45:58 GMT",
"version": "v2"
}
] | 2009-09-11 | [
[
"Kim",
"Wontae",
""
],
[
"Son",
"Edwin J.",
""
],
[
"Yoon",
"Myungseok",
""
]
] | We study thermodynamic quantities and examine the stability of a black hole in a cavity inspired by the noncommutative geometry. It turns out that thermodynamic behavior of the noncommutative black hole is analogous to that of the Reissner-Nordstr\"om black hole in the near extremal limit. Moreover, we identify the non... |
gr-qc/9506039 | Philip Tuckey | W. Drechsler and Philip A. Tuckey (MPI for Physics, Munich) | On quantum and parallel transport in a Hilbert bundle over spacetime | 25 pages, Plain TeX, harvmac/lanlmac | Class.Quant.Grav. 13 (1996) 611-632 | 10.1088/0264-9381/13/4/004 | MPI-PhT/95-37 | gr-qc | null | We study the Hilbert bundle description of stochastic quantum mechanics in
curved spacetime developed by Prugove\v{c}ki, which gives a powerful new
framework for exploring the quantum mechanical propagation of states in curved
spacetime. We concentrate on the quantum transport law in the bundle,
specifically on the i... | [
{
"created": "Tue, 20 Jun 1995 12:38:17 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Jul 1995 14:44:24 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Sep 1995 16:01:06 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Drechsler",
"W.",
"",
"MPI for Physics, Munich"
],
[
"Tuckey",
"Philip A.",
"",
"MPI for Physics, Munich"
]
] | We study the Hilbert bundle description of stochastic quantum mechanics in curved spacetime developed by Prugove\v{c}ki, which gives a powerful new framework for exploring the quantum mechanical propagation of states in curved spacetime. We concentrate on the quantum transport law in the bundle, specifically on the inf... |
1506.06054 | Moataz Emam | Jesse Chandler, Moataz H. Emam | Geodesic structure of five-dimensional non-asymptotically flat 2-branes | 14 pages, 14 figures | Physical Review D 91, 125024 (2015) | 10.1103/PhysRevD.91.125024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the geodesics of a five dimensional non-asymptotically flat
dilatonic 2-brane. Although the metric's warp function diverges logarithmically
in the far field region of the transverse space, the curvature does not. The
brane has two naked singularities, the usual central singularity and a circular
singularity ... | [
{
"created": "Fri, 19 Jun 2015 15:35:32 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Chandler",
"Jesse",
""
],
[
"Emam",
"Moataz H.",
""
]
] | We study the geodesics of a five dimensional non-asymptotically flat dilatonic 2-brane. Although the metric's warp function diverges logarithmically in the far field region of the transverse space, the curvature does not. The brane has two naked singularities, the usual central singularity and a circular singularity at... |
gr-qc/0502028 | Eric Poisson | Karl Martel and Eric Poisson | Gravitational perturbations of the Schwarzschild spacetime: A practical
covariant and gauge-invariant formalism | 21 pages | Phys.Rev. D71 (2005) 104003 | 10.1103/PhysRevD.71.104003 | null | gr-qc | null | We present a formalism to study the metric perturbations of the Schwarzschild
spacetime. The formalism is gauge invariant, and it is also covariant under
two-dimensional coordinate transformations that leave the angular coordinates
unchanged. The formalism is applied to the typical problem of calculating the
gravitat... | [
{
"created": "Tue, 8 Feb 2005 16:58:57 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Martel",
"Karl",
""
],
[
"Poisson",
"Eric",
""
]
] | We present a formalism to study the metric perturbations of the Schwarzschild spacetime. The formalism is gauge invariant, and it is also covariant under two-dimensional coordinate transformations that leave the angular coordinates unchanged. The formalism is applied to the typical problem of calculating the gravitatio... |
2309.12175 | Hryhorii Ovcharenko | H.V.Ovcharenko and O.B.Zaslavskii | Dynamics of redshift/blueshift during free fall under the Schwarzschild
horizon | 30 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a free-falling observer who crosses the event horizon in the
Schwarzschild background. In the course of this fall, he/she can receive
signals from an object (like a star surface) that emits radiation. We study how
the frequency received by an observer changes depending on the proper time on
his/her trajec... | [
{
"created": "Thu, 21 Sep 2023 15:33:18 GMT",
"version": "v1"
}
] | 2023-09-22 | [
[
"Ovcharenko",
"H. V.",
""
],
[
"Zaslavskii",
"O. B.",
""
]
] | We consider a free-falling observer who crosses the event horizon in the Schwarzschild background. In the course of this fall, he/she can receive signals from an object (like a star surface) that emits radiation. We study how the frequency received by an observer changes depending on the proper time on his/her trajecto... |
2303.11094 | William Barker Dr | W. E. V. Barker and M. P. Hobson and A. N. Lasenby | Does gravitational confinement sustain flat galactic rotation curves
without dark matter? | 33 pages, 19 figures | null | null | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | The short answer is $\textit{probably no}$. Specifically, this paper
considers a recent body of work which suggests that general relativity requires
neither the support of dark matter halos, nor unconventional baryonic profiles,
nor any infrared modification, to be consistent after all with the anomalously
rapid orbi... | [
{
"created": "Mon, 20 Mar 2023 13:29:29 GMT",
"version": "v1"
}
] | 2023-03-21 | [
[
"Barker",
"W. E. V.",
""
],
[
"Hobson",
"M. P.",
""
],
[
"Lasenby",
"A. N.",
""
]
] | The short answer is $\textit{probably no}$. Specifically, this paper considers a recent body of work which suggests that general relativity requires neither the support of dark matter halos, nor unconventional baryonic profiles, nor any infrared modification, to be consistent after all with the anomalously rapid orbits... |
2305.15733 | Haojie Lin | Hao-Jie Lin, Tao Zhu, Shao-Jun Zhang, and Anzhong Wang | Black hole scalarizations induced by parity violations | 9 pages, 3 figures, 1 table | Phys. Rev. D 108, 044005 (2023) | 10.1103/PhysRevD.108.044005 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | It is well-known that parity symmetry is broken in the weak interaction but
conserved for Einstein's general relativity and Maxwell's electromagnetic
theory. Nevertheless, parity symmetry could also be violated in the
gravitational/electromagnetic sectors if a fundamental scalar field couples to
the parity-violating ... | [
{
"created": "Thu, 25 May 2023 05:34:11 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2023 09:17:11 GMT",
"version": "v2"
}
] | 2024-04-17 | [
[
"Lin",
"Hao-Jie",
""
],
[
"Zhu",
"Tao",
""
],
[
"Zhang",
"Shao-Jun",
""
],
[
"Wang",
"Anzhong",
""
]
] | It is well-known that parity symmetry is broken in the weak interaction but conserved for Einstein's general relativity and Maxwell's electromagnetic theory. Nevertheless, parity symmetry could also be violated in the gravitational/electromagnetic sectors if a fundamental scalar field couples to the parity-violating gr... |
gr-qc/9910102 | Allan Widom | T. Sakai, A. Widom, Y.N. Srivastava | Entropy Production and Cosmological Inflation | 5 Pages, ReVTeX, 1 figure | null | null | gr-100 | gr-qc | null | The notion of inflation (past or present) in standard cosmological models is
shown to be a consequence of a sufficiently high second law entropy production
from the internal heating of the universal expansion. The longitudinal viscous
internal heating of matter requires neither ``inflaton'' fields nor
``quintessence'... | [
{
"created": "Thu, 28 Oct 1999 00:24:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sakai",
"T.",
""
],
[
"Widom",
"A.",
""
],
[
"Srivastava",
"Y. N.",
""
]
] | The notion of inflation (past or present) in standard cosmological models is shown to be a consequence of a sufficiently high second law entropy production from the internal heating of the universal expansion. The longitudinal viscous internal heating of matter requires neither ``inflaton'' fields nor ``quintessence'' ... |
1707.04169 | Roger Penrose | Roger Penrose | Correlated "noise" in LIGO gravitational wave signals: an implication of
Conformal Cyclic Cosmology | 8 pages | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been reported by Cresswell et al. [1] that correlations in
the noise surrounding the observed gravitational wave signals, GW150194,
GW151226, and GW170194 were found by the two LIGO detectors in Hanford and
Livingston with the same time delay as the signals themselves. This raised some
issues about th... | [
{
"created": "Wed, 12 Jul 2017 15:53:38 GMT",
"version": "v1"
}
] | 2017-07-14 | [
[
"Penrose",
"Roger",
""
]
] | It has recently been reported by Cresswell et al. [1] that correlations in the noise surrounding the observed gravitational wave signals, GW150194, GW151226, and GW170194 were found by the two LIGO detectors in Hanford and Livingston with the same time delay as the signals themselves. This raised some issues about the ... |
1904.06727 | Kirill Bronnikov | S.V. Bolokhov, K.A. Bronnikov and M.V. Skvortsova | Rotating cylinders with anisotropic fluids in general relativity | 10 two-column pages | Grav. Cosmol. 25, 122-130 (2019) | 10.1134/S020228931902004X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider anisotropic fluids with directional pressures $p_i = w_i \rho$
($\rho$ is the density, $w_i = $const, $i = 1,2,3$) as sources of gravity in
stationary cylindrically symmetric space-times. We describe a general way of
obtaining exact solutions with such sources, where the main features are
splitting of the... | [
{
"created": "Sun, 14 Apr 2019 17:13:02 GMT",
"version": "v1"
}
] | 2019-06-19 | [
[
"Bolokhov",
"S. V.",
""
],
[
"Bronnikov",
"K. A.",
""
],
[
"Skvortsova",
"M. V.",
""
]
] | We consider anisotropic fluids with directional pressures $p_i = w_i \rho$ ($\rho$ is the density, $w_i = $const, $i = 1,2,3$) as sources of gravity in stationary cylindrically symmetric space-times. We describe a general way of obtaining exact solutions with such sources, where the main features are splitting of the R... |
gr-qc/9302008 | null | P.S.Joshi and I.H.Dwivedi | The Structure of Naked Singularity in Self-similar Gravitational
Collapse II | 4 pages, TIFR preprint October 1992 | null | 10.1007/BF00739581 | null | gr-qc | null | Generalizing the results of Joshi and Dwivedi in Commun.Math.Phys. 146, p.333
(1992), it is pointed out that strong curvature naked singularities could occur
in the self-similar gravitational collapse of any form of matter satisfying the
weak energy condition for the positivity of mass-energy density.
| [
{
"created": "Tue, 9 Feb 1993 10:14:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Joshi",
"P. S.",
""
],
[
"Dwivedi",
"I. H.",
""
]
] | Generalizing the results of Joshi and Dwivedi in Commun.Math.Phys. 146, p.333 (1992), it is pointed out that strong curvature naked singularities could occur in the self-similar gravitational collapse of any form of matter satisfying the weak energy condition for the positivity of mass-energy density. |
gr-qc/9403034 | Hans-Juergen Matschull | Hans-Juergen Matschull | About Loop States in Supergravity | LaTeX, 20 pages, DESY-94-037 | Class.Quant.Grav.11:2395-2410,1994 | 10.1088/0264-9381/11/10/002 | null | gr-qc | null | The Wilson loop functionals in terms of Ashtekar's variables were the first
(formal) solutions to the quantized hamiltonian constraint of canonical
gravity. Here it is shown that the same functionals also solve the supergravity
constraints and some evidence is presented that they are artificially generated
by multipl... | [
{
"created": "Fri, 18 Mar 1994 11:17:40 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Matschull",
"Hans-Juergen",
""
]
] | The Wilson loop functionals in terms of Ashtekar's variables were the first (formal) solutions to the quantized hamiltonian constraint of canonical gravity. Here it is shown that the same functionals also solve the supergravity constraints and some evidence is presented that they are artificially generated by multiplyi... |
0704.1289 | M. D. Maia | M. D. Maia, Nildsen Silva and M.C.B. Fernandes | Brane-world Quantum Gravity | 14 pages, no figures, JHEP format, to appear in JHEP April 2007 | JHEP 0704:047,2007 | 10.1088/1126-6708/2007/04/047 | null | gr-qc | null | The Arnowitt-Deser-Misner canonical formulation of general relativity is
extended to the covariant brane-world theory in arbitrary dimensions. The
exclusive probing of the extra dimensions makes a substantial difference,
allowing for the construction of a non-constrained canonical theory. The
quantum states of the br... | [
{
"created": "Tue, 10 Apr 2007 18:26:09 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Maia",
"M. D.",
""
],
[
"Silva",
"Nildsen",
""
],
[
"Fernandes",
"M. C. B.",
""
]
] | The Arnowitt-Deser-Misner canonical formulation of general relativity is extended to the covariant brane-world theory in arbitrary dimensions. The exclusive probing of the extra dimensions makes a substantial difference, allowing for the construction of a non-constrained canonical theory. The quantum states of the bran... |
gr-qc/0303048 | Guendel Eduardo | E.I.Guendelman (Ben Gurion University) | Conformally Invariant Braneworld and the Cosmological Constant | 10 pages, latex, no figures, few typos corrected | Phys.Lett. B580 (2004) 87-92 | 10.1016/j.physletb.2003.09.102 | BGU-Phys. 67/2003 | gr-qc | null | A six dimensional braneworld scenario based on a model describing the
interaction of gravity, gauge fields and 3+1 branes in a conformally invariant
way is described. The action of the model is defined using a measure of
integration built of degrees of freedom independent of the metric. There is no
need to fine tune ... | [
{
"created": "Wed, 12 Mar 2003 10:08:24 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Mar 2003 13:04:57 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Guendelman",
"E. I.",
"",
"Ben Gurion University"
]
] | A six dimensional braneworld scenario based on a model describing the interaction of gravity, gauge fields and 3+1 branes in a conformally invariant way is described. The action of the model is defined using a measure of integration built of degrees of freedom independent of the metric. There is no need to fine tune an... |
gr-qc/9506029 | null | Kirill V.Krasnov | Quantum Loop Representation for Fermions coupled to Einstein-Maxwell
field | 28 pages, REVTeX 3.0, 15 uuencoded ps-figures. The construction of
the representation has been changed so that the representation space became
irreducible. One part is removed because it developed into a separate paper;
some corrections added | Phys. Rev. D 53, 1874 (1996) | 10.1103/PhysRevD.53.1874 | null | gr-qc | null | Quantization of the system comprising gravitational, fermionic and
electromagnetic fields is developed in the loop representation. As a result we
obtain a natural unified quantum theory. Gravitational field is treated in the
framework of Ashtekar formalism; fermions are described by two Grassmann-valued
fields. We de... | [
{
"created": "Fri, 16 Jun 1995 16:07:08 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Sep 1995 01:23:32 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Krasnov",
"Kirill V.",
""
]
] | Quantization of the system comprising gravitational, fermionic and electromagnetic fields is developed in the loop representation. As a result we obtain a natural unified quantum theory. Gravitational field is treated in the framework of Ashtekar formalism; fermions are described by two Grassmann-valued fields. We defi... |
2211.07991 | Mouhssine Koussour | M. Koussour, S. H. Shekh, M. Bennai and T. Ouali | Bulk viscous fluid in extended symmetric teleparallel gravity | CJPHY accepted version | Chinese Journal of Physics (2022) | 10.1016/j.cjph.2022.11.013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the existence of bulk viscous FLRW cosmological
models in a recently proposed extended symmetric teleparallel gravity or
$f\left( Q,T\right) $ gravity in which $Q$ is the non-metricity and $T$ is the
trace of the energy-momentum tensor. We consider a simple coupling between
matter and no... | [
{
"created": "Tue, 15 Nov 2022 09:00:44 GMT",
"version": "v1"
}
] | 2022-12-01 | [
[
"Koussour",
"M.",
""
],
[
"Shekh",
"S. H.",
""
],
[
"Bennai",
"M.",
""
],
[
"Ouali",
"T.",
""
]
] | In this paper, we investigate the existence of bulk viscous FLRW cosmological models in a recently proposed extended symmetric teleparallel gravity or $f\left( Q,T\right) $ gravity in which $Q$ is the non-metricity and $T$ is the trace of the energy-momentum tensor. We consider a simple coupling between matter and non-... |
gr-qc/9710004 | Enzo Leguizamon | Mirta S. Iriondo, Enzo O. Leguizam\'on and Oscar A. Reula | Einstein's equations in Ashtekar's variables constitute a symmetric
hyperbolic system | 4 pages, revteX | Phys.Rev.Lett. 79 (1997) 4732-4735 | 10.1103/PhysRevLett.79.4732 | null | gr-qc | null | We show that the 3+1 vacuum Einstein field equations in Ashtekar's variables
constitutes a first order symmetric hyperbolic system for arbitrary but fixed
lapse and shift fields, by suitable adding to the system terms proportional to
the constraint equations.
| [
{
"created": "Wed, 1 Oct 1997 17:31:45 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Iriondo",
"Mirta S.",
""
],
[
"Leguizamón",
"Enzo O.",
""
],
[
"Reula",
"Oscar A.",
""
]
] | We show that the 3+1 vacuum Einstein field equations in Ashtekar's variables constitutes a first order symmetric hyperbolic system for arbitrary but fixed lapse and shift fields, by suitable adding to the system terms proportional to the constraint equations. |
gr-qc/0309134 | Paul S. Wesson | Paul S. Wesson | Space-Time Uncertainty from Higher-Dimensional Determinism (or: How
Heisenberg was right in 4D because Einstein was right in 5D) | Accepted, J. Gen. Rel. and Grav., February 2004 | Gen.Rel.Grav. 36 (2004) 451-457 | 10.1023/B:GERG.0000010504.65118.fd | null | gr-qc | null | Heisenberg's uncertainty relation is commonly regarded as defining a level of
unpredictability that is fundamentally incompatible with the deterministic laws
embodied in classical field theories such as Einstein's general relativity. We
here show that this is not necessarily the case. Using 5D as an example of
dimens... | [
{
"created": "Sun, 28 Sep 2003 14:54:31 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Wesson",
"Paul S.",
""
]
] | Heisenberg's uncertainty relation is commonly regarded as defining a level of unpredictability that is fundamentally incompatible with the deterministic laws embodied in classical field theories such as Einstein's general relativity. We here show that this is not necessarily the case. Using 5D as an example of dimensio... |
gr-qc/0510035 | Peter D'Eath | A.N.St.J.Farley and P.D.D'Eath | Spin-2 Amplitudes in Black-Hole Evaporation | null | null | 10.1088/0264-9381/22/13/015 | null | gr-qc | null | Quantum amplitudes for $s=2$ gravitational-wave perturbations of
Einstein/scalar collapse to a black hole are treated by analogy with $s=1$
Maxwell perturbations. The spin-2 perturbations split into parts with odd and
even parity. We use the Regge-Wheeler gauge; at a certain point we make a gauge
transformation to an... | [
{
"created": "Sat, 8 Oct 2005 10:09:54 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Farley",
"A. N. St. J.",
""
],
[
"D'Eath",
"P. D.",
""
]
] | Quantum amplitudes for $s=2$ gravitational-wave perturbations of Einstein/scalar collapse to a black hole are treated by analogy with $s=1$ Maxwell perturbations. The spin-2 perturbations split into parts with odd and even parity. We use the Regge-Wheeler gauge; at a certain point we make a gauge transformation to an a... |
2310.14653 | De-Cheng Zou | Bo Liu, Rui-Hong Yue, De-Cheng Zou, Lina Zhang, Zhan-Ying Yang and
Qiyuan Pan | Black holes in massive Einstein-dilaton gravity | 23 pages, 12 figures | Phys.Rev.D.109, 064013(2024) | 10.1103/PhysRevD.109.064013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we focus on massive Einstein-dilaton gravity including the
coupling of dilaton scalar field to massive graviton terms, and then derive
static and spherically symmetric solutions of dilatonic black holes in four
dimensional spacetime. We find that the dilatonic black hole could possess two
horizons (eve... | [
{
"created": "Mon, 23 Oct 2023 07:48:41 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2024 01:19:37 GMT",
"version": "v2"
}
] | 2024-03-07 | [
[
"Liu",
"Bo",
""
],
[
"Yue",
"Rui-Hong",
""
],
[
"Zou",
"De-Cheng",
""
],
[
"Zhang",
"Lina",
""
],
[
"Yang",
"Zhan-Ying",
""
],
[
"Pan",
"Qiyuan",
""
]
] | In this paper, we focus on massive Einstein-dilaton gravity including the coupling of dilaton scalar field to massive graviton terms, and then derive static and spherically symmetric solutions of dilatonic black holes in four dimensional spacetime. We find that the dilatonic black hole could possess two horizons (event... |
2306.03599 | Xiongjun Fang | Wentao Liu, Xiongjun Fang, Jiliang Jing, Jieci Wang | Gravito-electromagnetic perturbations of MOG black holes with a
cosmological constant: Quasinormal modes and Ringdown waveforms | 18pages, 6 figures | JCAP 11 (2023) 057 | 10.1088/1475-7516/2023/11/057 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this paper, we present a black hole solution with a cosmological constant
in the Scalar-Tensor-Vector Modified Gravity (MOG) theory, where the strength
of the gravitational constant is determined by $G = G_\text{N}(1+\alpha)$. We
derive the master equations for gravito-electromagnetic perturbations and
numerically... | [
{
"created": "Tue, 6 Jun 2023 11:40:39 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jun 2023 13:19:50 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Jun 2023 14:53:46 GMT",
"version": "v3"
},
{
"created": "Wed, 11 Oct 2023 02:56:43 GMT",
"version": "v4"
}
] | 2024-02-22 | [
[
"Liu",
"Wentao",
""
],
[
"Fang",
"Xiongjun",
""
],
[
"Jing",
"Jiliang",
""
],
[
"Wang",
"Jieci",
""
]
] | In this paper, we present a black hole solution with a cosmological constant in the Scalar-Tensor-Vector Modified Gravity (MOG) theory, where the strength of the gravitational constant is determined by $G = G_\text{N}(1+\alpha)$. We derive the master equations for gravito-electromagnetic perturbations and numerically s... |
2305.09706 | Manuel Rodrigues | Ednaldo L. B. Junior, Manuel E. Rodrigues, Henrique A. Vieira | Is it possible to distinguish between different black hole solutions
using the Shapiro time delay? | null | Eur. Phys. J. C (2023) 83:409 | 10.1140/epjc/s10052-023-11520-z | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we propose to use Shapiro time delay as a tool to distinguish
between different black hole solutions. We calculate the analytic Shapiro time,
using first-order expansions, for four solutions. They are Schwarzschild,
Reissner-Nordstr\"o{}m, Bardeen, and Ay\'on-Beato and Garc\'ia. We created a
numerical e... | [
{
"created": "Tue, 16 May 2023 14:52:59 GMT",
"version": "v1"
}
] | 2023-05-18 | [
[
"Junior",
"Ednaldo L. B.",
""
],
[
"Rodrigues",
"Manuel E.",
""
],
[
"Vieira",
"Henrique A.",
""
]
] | In this paper we propose to use Shapiro time delay as a tool to distinguish between different black hole solutions. We calculate the analytic Shapiro time, using first-order expansions, for four solutions. They are Schwarzschild, Reissner-Nordstr\"o{}m, Bardeen, and Ay\'on-Beato and Garc\'ia. We created a numerical exp... |
2105.14735 | Jiawei Hu | Yuebing Zhou, Jiawei Hu, Hongwei Yu | Entanglement dynamics for Unruh-DeWitt detectors interacting with
massive scalar fields: The Unruh and anti-Unruh effects | 37 pages, 12 figures, published version | JHEP 09(2021)088 | 10.1007/JHEP09(2021)088 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study, in the framework of open quantum systems, the entanglement dynamics
for a quantum system composed of two uniformly accelerated Unruh-Dewitt
detectors interacting with a bath of massive scalar fields in the Minkowski
vacuum. We find that the entanglement evolution for the quantum system coupled
with massive ... | [
{
"created": "Mon, 31 May 2021 06:57:59 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Sep 2021 02:18:45 GMT",
"version": "v2"
}
] | 2021-09-20 | [
[
"Zhou",
"Yuebing",
""
],
[
"Hu",
"Jiawei",
""
],
[
"Yu",
"Hongwei",
""
]
] | We study, in the framework of open quantum systems, the entanglement dynamics for a quantum system composed of two uniformly accelerated Unruh-Dewitt detectors interacting with a bath of massive scalar fields in the Minkowski vacuum. We find that the entanglement evolution for the quantum system coupled with massive fi... |
gr-qc/9912072 | Garcia | L.C.Garcia de Andrade | On de Sitter deflationary cosmology from the spin-torsion primordial
fluctuations and COBE data | Latex file 7 Kb | null | null | null | gr-qc | null | Fluctuations on de Sitter solution of Einstein-Cartan field equations are
obtained in terms of the matter density primordial density fluctuations and
spin-torsion density and matter density fluctuations obtained from COBE data.
Einstein-de Sitter solution is shown to be unstable even in the absence of
torsion.The spi... | [
{
"created": "Thu, 16 Dec 1999 23:17:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | Fluctuations on de Sitter solution of Einstein-Cartan field equations are obtained in terms of the matter density primordial density fluctuations and spin-torsion density and matter density fluctuations obtained from COBE data. Einstein-de Sitter solution is shown to be unstable even in the absence of torsion.The spin-... |
0807.3896 | Grigory Volovik | F.R. Klinkhamer and G.E. Volovik | f(R) Cosmology from q-Theory | 6 pages, v4: this archive version corresponds to the published
version with a few minor corrections | JETP Lett.88:289-294,2008 | 10.1134/S0021364008170013 | KA-TP-18-2008 | gr-qc astro-ph cond-mat.other hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From a macroscopic theory of the quantum vacuum in terms of conserved
relativistic charges (generically denoted by q^{(a)} with label a), we have
obtained, in the low-energy limit, a particular type of f(R) model relevant to
cosmology. The macroscopic quantum-vacuum theory allows us to distinguish
between different p... | [
{
"created": "Thu, 24 Jul 2008 19:14:44 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jul 2008 11:41:47 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Aug 2008 13:13:17 GMT",
"version": "v3"
},
{
"created": "Sun, 8 Feb 2009 10:31:51 GMT",
"version": "v4"
}
] | 2009-02-19 | [
[
"Klinkhamer",
"F. R.",
""
],
[
"Volovik",
"G. E.",
""
]
] | From a macroscopic theory of the quantum vacuum in terms of conserved relativistic charges (generically denoted by q^{(a)} with label a), we have obtained, in the low-energy limit, a particular type of f(R) model relevant to cosmology. The macroscopic quantum-vacuum theory allows us to distinguish between different phe... |
0807.2834 | Ik Siong Heng | LIGO Scientific Collaboration: B. Abbott, et al | First joint search for gravitational-wave bursts in LIGO and GEO600 data | 30 pages, 8 figures | Class.Quant.Grav.25:245008,2008 | 10.1088/0264-9381/25/24/245008 | LIGO-P080008-A-Z | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of the first joint search for gravitational-wave
bursts by the LIGO and GEO600 detectors. We search for bursts with
characteristic central frequencies in the band 768 to 2048 Hz in the data
acquired between the 22nd of February and the 23rd of March, 2005 (fourth LSC
Science Run - S4). We discu... | [
{
"created": "Thu, 17 Jul 2008 16:58:25 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Oct 2008 10:10:09 GMT",
"version": "v2"
}
] | 2009-01-09 | [
[
"LIGO Scientific Collaboration",
"",
""
],
[
"Abbott",
"B.",
""
]
] | We present the results of the first joint search for gravitational-wave bursts by the LIGO and GEO600 detectors. We search for bursts with characteristic central frequencies in the band 768 to 2048 Hz in the data acquired between the 22nd of February and the 23rd of March, 2005 (fourth LSC Science Run - S4). We discuss... |
1412.3522 | Zhi-Yong Wang | Zhi-Yong Wang | Spin-orbit couplings of quantum fields in Schwarzschild spacetime | 13 pages, no figure | null | null | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | In Schwarzschild spacetime, the gravitational spin-orbit couplings of the
massless Dirac field and the photon field can be studied in a unified way. In
contrary to the previous investigations presented mainly at the
quantum-mechanical level, our work is presented at the level of quantum field
theory without resorting... | [
{
"created": "Thu, 11 Dec 2014 02:32:58 GMT",
"version": "v1"
}
] | 2014-12-12 | [
[
"Wang",
"Zhi-Yong",
""
]
] | In Schwarzschild spacetime, the gravitational spin-orbit couplings of the massless Dirac field and the photon field can be studied in a unified way. In contrary to the previous investigations presented mainly at the quantum-mechanical level, our work is presented at the level of quantum field theory without resorting t... |
1611.06522 | Carlo Pagani | Carlo Pagani and Martin Reuter | Composite Operators in Asymptotic Safety | 38 pages | Phys. Rev. D 95, 066002 (2017) | 10.1103/PhysRevD.95.066002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the role of composite operators in the Asymptotic Safety program for
quantum gravity. By including in the effective average action an explicit
dependence on new sources we are able to keep track of operators which do not
belong to the exact theory space and/or are normally discarded in a truncation.
Typical ... | [
{
"created": "Sun, 20 Nov 2016 15:00:18 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2016 14:35:32 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Mar 2017 14:54:45 GMT",
"version": "v3"
}
] | 2017-03-21 | [
[
"Pagani",
"Carlo",
""
],
[
"Reuter",
"Martin",
""
]
] | We study the role of composite operators in the Asymptotic Safety program for quantum gravity. By including in the effective average action an explicit dependence on new sources we are able to keep track of operators which do not belong to the exact theory space and/or are normally discarded in a truncation. Typical ex... |
gr-qc/9712041 | Shahar Hod | Shahar Hod and Tsvi Piran | Late-Time Evolution of Charged Gravitational Collapse and Decay of
Charged Scalar Hair - I | 14 pages, latex, no figures | Phys.Rev. D58 (1998) 024017 | 10.1103/PhysRevD.58.024017 | null | gr-qc | null | We study analytically the asymptotic evolution of charged fields around a
Reissner-Nordstr\"om black-hole. Following the no-hair theorem we focus
attention on the dynamical mechanism by which the charged hair is radiated
away. We find an inverse power-law relaxation of the charged fields at future
timelike infinity, ... | [
{
"created": "Tue, 9 Dec 1997 10:32:44 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Hod",
"Shahar",
""
],
[
"Piran",
"Tsvi",
""
]
] | We study analytically the asymptotic evolution of charged fields around a Reissner-Nordstr\"om black-hole. Following the no-hair theorem we focus attention on the dynamical mechanism by which the charged hair is radiated away. We find an inverse power-law relaxation of the charged fields at future timelike infinity, al... |
gr-qc/0701150 | Marcello Ortaggio | Marcello Ortaggio, Vojtech Pravda, Alena Pravdova | Ricci identities in higher dimensions | 8 pages. v2: typo corrected between Propositions 2 and 3. v3: typo in
the last term in the first line of (11f) corrected, missing term on the
r.h.s. of (11p) added, first sentence between Propositions 2 and 3 slightly
changed | Class.Quant.Grav.24:1657-1664,2007 | 10.1088/0264-9381/24/6/018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore connections between geometrical properties of null congruences and
the algebraic structure of the Weyl tensor in n>4 spacetime dimensions. First,
we present the full set of Ricci identities on a suitable "null" frame, thus
completing the extension of the Newman-Penrose formalism to higher dimensions.
Then ... | [
{
"created": "Sat, 27 Jan 2007 21:36:26 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2007 15:18:43 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Feb 2012 15:22:30 GMT",
"version": "v3"
}
] | 2012-02-22 | [
[
"Ortaggio",
"Marcello",
""
],
[
"Pravda",
"Vojtech",
""
],
[
"Pravdova",
"Alena",
""
]
] | We explore connections between geometrical properties of null congruences and the algebraic structure of the Weyl tensor in n>4 spacetime dimensions. First, we present the full set of Ricci identities on a suitable "null" frame, thus completing the extension of the Newman-Penrose formalism to higher dimensions. Then we... |
1702.02472 | Maaneli Derakhshani | Maaneli Derakhshani | Semiclassical Newtonian Field Theories Based On Stochastic Mechanics II | 19 pages (17 pages without references), no figures, LaTeX | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuing the development of the ZSM-Newton/Coulomb approach to
semiclassical Newtonian gravity/electrodynamics [1], we formulate a
ZSM-Newton/Coulomb version of the large N approximation scheme proposed by
Oriols et al. [2]. We show that this new large N scheme makes it possible to
self-consistently describe the ce... | [
{
"created": "Tue, 7 Feb 2017 16:29:38 GMT",
"version": "v1"
}
] | 2017-02-09 | [
[
"Derakhshani",
"Maaneli",
""
]
] | Continuing the development of the ZSM-Newton/Coulomb approach to semiclassical Newtonian gravity/electrodynamics [1], we formulate a ZSM-Newton/Coulomb version of the large N approximation scheme proposed by Oriols et al. [2]. We show that this new large N scheme makes it possible to self-consistently describe the cent... |
1207.2153 | Alberto Diez-Tejedor | Juan Barranco, Argelia Bernal, Juan Carlos Degollado, Alberto
Diez-Tejedor, Miguel Megevand, Miguel Alcubierre, Dar\'io N\'u\~nez and
Olivier Sarbach | Schwarzschild black holes can wear scalar wigs | 5 pages, 3 figures. Accepted for publication in Physical Review
Letters | Phys. Rev. Lett. 109, 081102 (2012) | 10.1103/PhysRevLett.109.081102 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of a massive scalar field surrounding a Schwarzschild
black hole and find configurations that can survive for arbitrarily long times,
provided the black hole or the scalar field mass is small enough. In
particular, both ultra-light scalar field dark matter around supermassive black
holes and ax... | [
{
"created": "Mon, 9 Jul 2012 20:00:04 GMT",
"version": "v1"
}
] | 2012-08-31 | [
[
"Barranco",
"Juan",
""
],
[
"Bernal",
"Argelia",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Diez-Tejedor",
"Alberto",
""
],
[
"Megevand",
"Miguel",
""
],
[
"Alcubierre",
"Miguel",
""
],
[
"Núñez",
"Darío",
... | We study the evolution of a massive scalar field surrounding a Schwarzschild black hole and find configurations that can survive for arbitrarily long times, provided the black hole or the scalar field mass is small enough. In particular, both ultra-light scalar field dark matter around supermassive black holes and axio... |
1511.00868 | Liwei Ji | Rong-Gen Cai, Li-Wei Ji, Run-Qiu Yang | Collapse of self-interacting scalar field in anti-de Sitter space | 7 pages, 5 figures | null | 10.1088/0253-6102/65/3/329 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational collapse of a massless scalar field with a self-interaction
term $\lambda\phi^4$ in anti-de Sitter space is investigated. We numerically
investigate the effect of the self-interaction term on the critical amplitudes,
forming time of apparent horizon, stable island and energy transformation. The
resu... | [
{
"created": "Tue, 3 Nov 2015 12:04:54 GMT",
"version": "v1"
}
] | 2016-04-20 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Ji",
"Li-Wei",
""
],
[
"Yang",
"Run-Qiu",
""
]
] | The gravitational collapse of a massless scalar field with a self-interaction term $\lambda\phi^4$ in anti-de Sitter space is investigated. We numerically investigate the effect of the self-interaction term on the critical amplitudes, forming time of apparent horizon, stable island and energy transformation. The result... |
2309.09439 | Ioannis Soranidis | Fil Simovic, Ioannis Soranidis | Euclidean and Hamiltonian thermodynamics for regular black holes | 19 pages, 10 figures, Published version. Comments welcome! | Phys. Rev. D 109, 044029 (2024) | 10.1103/PhysRevD.109.044029 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We investigate the thermodynamic properties of the Hayward regular black hole
using both Euclidean path integral and Hamiltonian methods, in asymptotically
anti-de Sitter, Minkowski, and de Sitter spacetimes. With the inclusion of
matter fields which act as a source for the regular black hole geometry, an
effective t... | [
{
"created": "Mon, 18 Sep 2023 02:42:30 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Feb 2024 23:01:26 GMT",
"version": "v2"
}
] | 2024-03-04 | [
[
"Simovic",
"Fil",
""
],
[
"Soranidis",
"Ioannis",
""
]
] | We investigate the thermodynamic properties of the Hayward regular black hole using both Euclidean path integral and Hamiltonian methods, in asymptotically anti-de Sitter, Minkowski, and de Sitter spacetimes. With the inclusion of matter fields which act as a source for the regular black hole geometry, an effective tem... |
2112.04313 | Christos Tsagas | Christos G. Tsagas | The deceleration parameter in `tilted' universes: generalising the
Friedmann background | Minor revision, references added. To appear in EPJC | null | 10.1140/epjc/s10052-022-10452-4 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Large-scale bulk peculiar motions introduce a characteristic length scale,
inside which the local kinematics are dominated by peculiar-velocity
perturbations rather than by the background Hubble expansion. Regions smaller
than the aforementioned critical length, which typically varies between few
hundred and several ... | [
{
"created": "Wed, 8 Dec 2021 14:42:47 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2022 10:51:56 GMT",
"version": "v2"
}
] | 2022-06-29 | [
[
"Tsagas",
"Christos G.",
""
]
] | Large-scale bulk peculiar motions introduce a characteristic length scale, inside which the local kinematics are dominated by peculiar-velocity perturbations rather than by the background Hubble expansion. Regions smaller than the aforementioned critical length, which typically varies between few hundred and several hu... |
gr-qc/9910022 | Mark Miller | Mark Miller, Wai-Mo Suen, and Malcolm Tobias | Collision of 1.4 $M_{\odot}$ Neutron Stars: Dynamical or
Quasi-Equilibrium? | 5 pages, 4 figures | null | null | null | gr-qc astro-ph | null | Shapiro put forth a conjecture stating that neutron stars in head-on
collisions (infalling from infinity) will not collapse to black holes before
neutrino cooling, independent of the mass of the neutron stars. In a previous
paper we carried out a numerical simulation showing a counter example based on
1.4 $M_{\odot}$... | [
{
"created": "Wed, 6 Oct 1999 18:13:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Miller",
"Mark",
""
],
[
"Suen",
"Wai-Mo",
""
],
[
"Tobias",
"Malcolm",
""
]
] | Shapiro put forth a conjecture stating that neutron stars in head-on collisions (infalling from infinity) will not collapse to black holes before neutrino cooling, independent of the mass of the neutron stars. In a previous paper we carried out a numerical simulation showing a counter example based on 1.4 $M_{\odot}$ n... |
0807.0969 | Karim Noui | Karim Noui | A model for the motion of a particle in a quantum background | 21 pages | Phys.Rev.D78:105008,2008 | 10.1103/PhysRevD.78.105008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are studying the dynamics of a one-dimensional field in a non-commutative
Euclidean space. The non-commutative space we consider is the one that emerges
in the context of three dimensional Euclidean quantum gravity: it is a
deformation of the classical Euclidean space and the Planck length plays the
role of the de... | [
{
"created": "Mon, 7 Jul 2008 08:56:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Noui",
"Karim",
""
]
] | We are studying the dynamics of a one-dimensional field in a non-commutative Euclidean space. The non-commutative space we consider is the one that emerges in the context of three dimensional Euclidean quantum gravity: it is a deformation of the classical Euclidean space and the Planck length plays the role of the defo... |
2307.16098 | Giorgi Tukhashvili | Giorgi Tukhashvili and Paul J. Steinhardt | Cosmological Bounces Induced by a Fermion Condensate | 5 pages, 4 figures; to appear in PRL | Phys. Rev. Lett. 131, 091001 (2023) | 10.1103/PhysRevLett.131.091001 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that it is possible for fermion condensation of the
Nambu-Jona-Lasinio type to induce a non-singular bounce that smoothly connects
a phase of slow contraction to a phase of expansion. A chiral condensate -- a
non-zero vacuum expectation value of the spinor bilinear $\langle
\bar{\Psi}\Psi \rangle$ -- can form... | [
{
"created": "Sun, 30 Jul 2023 01:03:48 GMT",
"version": "v1"
}
] | 2023-08-30 | [
[
"Tukhashvili",
"Giorgi",
""
],
[
"Steinhardt",
"Paul J.",
""
]
] | We show that it is possible for fermion condensation of the Nambu-Jona-Lasinio type to induce a non-singular bounce that smoothly connects a phase of slow contraction to a phase of expansion. A chiral condensate -- a non-zero vacuum expectation value of the spinor bilinear $\langle \bar{\Psi}\Psi \rangle$ -- can form s... |
1304.0672 | Nicola Tamanini | Nicola Tamanini and Christian G. Boehmer | Definition of Good Tetrads for f(T) Gravity | Prepared for the proceedings of the 13th Marcel Grossmann Meeting | null | 10.1142/9789814623995_0148 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The importance of choosing suitable tetrads for the study of exact solutions
in f(T) gravity is discussed. For any given metric, we define the concept of
good tetrads as the tetrads satisfying the field equations without constrainig
the function f(T). Employing local Lorentz transformations, good tetrads in the
conte... | [
{
"created": "Tue, 2 Apr 2013 15:52:40 GMT",
"version": "v1"
}
] | 2017-02-22 | [
[
"Tamanini",
"Nicola",
""
],
[
"Boehmer",
"Christian G.",
""
]
] | The importance of choosing suitable tetrads for the study of exact solutions in f(T) gravity is discussed. For any given metric, we define the concept of good tetrads as the tetrads satisfying the field equations without constrainig the function f(T). Employing local Lorentz transformations, good tetrads in the context... |
gr-qc/9704050 | Larry Ford | L.H. Ford and N.F. Svaiter | Cosmological and Black Hole Horizon Fluctuations | 22 pages, Latex, 4 figures, uses epsf | Phys. Rev. D 56, 2226 (1997) | 10.1103/PhysRevD.56.2226 | CBPF-NF-017/97, TUTP-97-8 | gr-qc hep-th | null | The quantum fluctuations of horizons in Robertson-Walker universes and in the
Schwarzschild spacetime are discussed. The source of the metric fluctuations is
taken to be quantum linear perturbations of the gravitational field. Lightcone
fluctuations arise when the retarded Green's function for a massless field is
ave... | [
{
"created": "Thu, 17 Apr 1997 17:48:44 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Ford",
"L. H.",
""
],
[
"Svaiter",
"N. F.",
""
]
] | The quantum fluctuations of horizons in Robertson-Walker universes and in the Schwarzschild spacetime are discussed. The source of the metric fluctuations is taken to be quantum linear perturbations of the gravitational field. Lightcone fluctuations arise when the retarded Green's function for a massless field is avera... |
gr-qc/0409009 | Yuri Pavlov | Yu. V. Pavlov | Renormalization and dimensional regularization for a scalar field with
Gauss-Bonnet-type coupling to curvature | LATEX, 21 pages, no figure | Theor.Math.Phys. 140 (2004) 1095-1108; Teor.Mat.Fiz. 140 (2004)
241-255 | null | null | gr-qc hep-th | null | We consider a scalar field with a Gauss-Bonnet-type coupling to the curvature
in a curved space-time. For such a quadratic coupling to the curvature, the
metric energy-momentum tensor does not contain derivatives of the metric of
orders greater than two. We obtain the metric energy-momentum tensor and find
the geomet... | [
{
"created": "Thu, 2 Sep 2004 09:56:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pavlov",
"Yu. V.",
""
]
] | We consider a scalar field with a Gauss-Bonnet-type coupling to the curvature in a curved space-time. For such a quadratic coupling to the curvature, the metric energy-momentum tensor does not contain derivatives of the metric of orders greater than two. We obtain the metric energy-momentum tensor and find the geometri... |
gr-qc/9704070 | N. K. Dadhich | Naresh Dadhich and K. Narayan | On the third law of black hole dynamics | 9 pages, LaTeX version, Accepted in Physics Letters A | Phys.Lett. A231 (1997) 335-338 | 10.1016/S0375-9601(97)00337-X | IUCAA-31/97 | gr-qc | null | The third law of black hole dynamics states that the surface gravity
(temperature) of black hole cannot be reduced to zero in finite sequence of
physical interactions. We argue that the same is true when surface gravity is
replaced by gravitational charge. We demonstrate that the prescribed window for
infalling energ... | [
{
"created": "Fri, 25 Apr 1997 13:30:46 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Dadhich",
"Naresh",
""
],
[
"Narayan",
"K.",
""
]
] | The third law of black hole dynamics states that the surface gravity (temperature) of black hole cannot be reduced to zero in finite sequence of physical interactions. We argue that the same is true when surface gravity is replaced by gravitational charge. We demonstrate that the prescribed window for infalling energy ... |
1602.03478 | Ichiro Oda | Ichiro Oda | Induced Gravity and Topological Quantum Field Theory | 7 pages | null | null | DPUR/TH/47 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an induced gravity (pregeometry) where both the Newton constant
and the cosmological constant appear as integration constants in solving field
equations. By adding the kinetic terms of ghosts and antighosts, an action of
the induced gravity is transformed to a topological field theory. Moreover, by
solvi... | [
{
"created": "Wed, 10 Feb 2016 18:34:34 GMT",
"version": "v1"
}
] | 2016-02-11 | [
[
"Oda",
"Ichiro",
""
]
] | We construct an induced gravity (pregeometry) where both the Newton constant and the cosmological constant appear as integration constants in solving field equations. By adding the kinetic terms of ghosts and antighosts, an action of the induced gravity is transformed to a topological field theory. Moreover, by solving... |
2204.05640 | Carlos A. R. Herdeiro | Carlos A. R. Herdeiro | Black holes: on the universality of the Kerr hypothesis | 16 pages, 3 figures, contribution to the forthcoming book "Modified
and Quantum Gravity - From theory to experimental searches on all scales" | null | null | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | To what extent are all astrophysical, dark, compact objects both black holes
(BHs) and described by the Kerr geometry? We embark on the exercise of defying
the universality of this remarkable idea, often called the "Kerr hypothesis".
After establishing its rationale and timeliness, we define a minimal set of
reasonab... | [
{
"created": "Tue, 12 Apr 2022 09:06:40 GMT",
"version": "v1"
}
] | 2022-04-13 | [
[
"Herdeiro",
"Carlos A. R.",
""
]
] | To what extent are all astrophysical, dark, compact objects both black holes (BHs) and described by the Kerr geometry? We embark on the exercise of defying the universality of this remarkable idea, often called the "Kerr hypothesis". After establishing its rationale and timeliness, we define a minimal set of reasonabil... |
1911.06315 | Jhonny Andres Agudelo Ruiz J. A. Agudelo Ruiz | Jhonny A. Agudelo Ruiz, Tib\'erio de Paula Netto, J\'ulio C. Fabris,
Ilya L. Shapiro | Primordial universe with the running cosmological constant | 24 pages, 6 figures, 1 table. Some misprints and notations corrected.
Version fits published in EPJC. Three references to the same group of authors
added due to the request of anonymous referee, with the corresponding
critical explanations | Eur. Phys. J. C 80, 851 (2020) | 10.1140/epjc/s10052-020-8226-x | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theoretically, the running of the cosmological constant in the IR region is
not ruled out. On the other hand, from the QFT viewpoint, the energy released
due to the variation of the cosmological constant in the late universe cannot
go to the matter sector. For this reason, the phenomenological bounds on such a
runnin... | [
{
"created": "Thu, 14 Nov 2019 18:55:39 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2020 20:57:08 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Sep 2020 04:10:44 GMT",
"version": "v3"
}
] | 2020-09-30 | [
[
"Ruiz",
"Jhonny A. Agudelo",
""
],
[
"Netto",
"Tibério de Paula",
""
],
[
"Fabris",
"Júlio C.",
""
],
[
"Shapiro",
"Ilya L.",
""
]
] | Theoretically, the running of the cosmological constant in the IR region is not ruled out. On the other hand, from the QFT viewpoint, the energy released due to the variation of the cosmological constant in the late universe cannot go to the matter sector. For this reason, the phenomenological bounds on such a running ... |
2111.14845 | Gargi Biswas | Gargi Biswas, M K Dutta and B Modak | Wormhole inducing inflation with Einstein Gauss Bonnet dilaton
interaction | 17 pages, 17 figures, communicated in MPLA. arXiv admin note: text
overlap with arXiv:2111.13913 | null | 10.1142/S0217732322501218 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present a few Euclidean wormhole configurations using both the analytic
and numerical solutions of the field equations considering Einstein
Gauss-Bonnet dilaton interaction in 4-dimensional Robertson Walker Euclidean
background. In one analytic solution we present transition from a wormhole to
an exponential expan... | [
{
"created": "Mon, 29 Nov 2021 17:34:59 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 2021 17:01:28 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Mar 2022 05:57:21 GMT",
"version": "v3"
},
{
"created": "Fri, 13 May 2022 07:52:35 GMT",
"version": "v4"
}
] | 2022-08-31 | [
[
"Biswas",
"Gargi",
""
],
[
"Dutta",
"M K",
""
],
[
"Modak",
"B",
""
]
] | We present a few Euclidean wormhole configurations using both the analytic and numerical solutions of the field equations considering Einstein Gauss-Bonnet dilaton interaction in 4-dimensional Robertson Walker Euclidean background. In one analytic solution we present transition from a wormhole to an exponential expansi... |
2301.04834 | Soham Sen | Soham Sen, Rituparna Mandal and Sunandan Gangopadhyay | Near horizon approximation and beyond for a two-level atom falling into
a Kerr-Newman black hole | 15 Pages LATEX | Eur. Phys. J. Plus (2023) 138:855 | 10.1140/epjp/s13360-023-04482-4 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work we investigate the phenomena of acceleration radiation for a
two-level atom falling into the event horizon of a Kerr-Newman black hole. In
https://link.aps.org/doi/10.1103/PhysRevD.104.065006 (Phys. Rev. D 104 (2021)
065006), it has been shown that conformal quantum mechanics has a connection to
the gene... | [
{
"created": "Thu, 12 Jan 2023 06:34:27 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 2023 17:59:49 GMT",
"version": "v2"
}
] | 2023-09-28 | [
[
"Sen",
"Soham",
""
],
[
"Mandal",
"Rituparna",
""
],
[
"Gangopadhyay",
"Sunandan",
""
]
] | In this work we investigate the phenomena of acceleration radiation for a two-level atom falling into the event horizon of a Kerr-Newman black hole. In https://link.aps.org/doi/10.1103/PhysRevD.104.065006 (Phys. Rev. D 104 (2021) 065006), it has been shown that conformal quantum mechanics has a connection to the genera... |
1905.06931 | Vadim Belov | Vadim Belov | On Geometry and Symmetries in Classical and Quantum Theories of Gauge
Gravity | PhD thesis, 167 pages. The first few chapters may serve an (almost)
self-contained introduction into differential geometry of Cartan connections
and gauge gravity. The special emphasis is paid to symmetries, as well as
contact between infinitesimal (`microscopic') and integral (`coarse-grained')
pictures is exh... | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin Foam and Loop approaches to Quantum Gravity reformulate Einstein's
theory of relativity in terms of connection variables. The metric properties
are encoded in face bivectors/conjugate fluxes that are required to satisfy
certain conditions, in order to allow for their geometric interpretation. We
show that the (s... | [
{
"created": "Thu, 16 May 2019 17:47:43 GMT",
"version": "v1"
}
] | 2019-05-17 | [
[
"Belov",
"Vadim",
""
]
] | Spin Foam and Loop approaches to Quantum Gravity reformulate Einstein's theory of relativity in terms of connection variables. The metric properties are encoded in face bivectors/conjugate fluxes that are required to satisfy certain conditions, in order to allow for their geometric interpretation. We show that the (sub... |
2112.03652 | Tiago Gon\c{c}alves | Tiago B. Gon\c{c}alves, Jo\~ao Lu\'is Rosa, Francisco S. N. Lobo | Cosmology in the novel scalar-tensor representation of $f(R,T)$ gravity | 11 pages, 3 figures; Contribution to the Sixteenth Marcel Grossman
Conference (MG16, Rome, July, 2021), to be published by World Scientific;
based on arXiv:2112.02541 [gr-qc] | The Sixteenth Marcel Grossmann Meeting, pp. 932-942 (2023) | 10.1142/9789811269776_0072 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply cosmological reconstruction methods to the $f(R,T)$ modified
gravity, in its recently developed scalar-tensor representation. We do this
analysis assuming a perfect fluid in a Friedmann-Lema\^{i}tre-Robsertson-Walker
(FLRW) universe. In this contribution we show the equations of motion obtained
and we presen... | [
{
"created": "Tue, 7 Dec 2021 12:03:08 GMT",
"version": "v1"
}
] | 2024-07-24 | [
[
"Gonçalves",
"Tiago B.",
""
],
[
"Rosa",
"João Luís",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | We apply cosmological reconstruction methods to the $f(R,T)$ modified gravity, in its recently developed scalar-tensor representation. We do this analysis assuming a perfect fluid in a Friedmann-Lema\^{i}tre-Robsertson-Walker (FLRW) universe. In this contribution we show the equations of motion obtained and we present ... |
1311.0732 | Ivan Arraut | Ivan Arraut | On the Black Holes in alternative theories of gravity: The case of
non-linear massive gravity | Final version to appear at Int.J.Mod.Phys. D. arXiv admin note:
substantial text overlap with arXiv:1305.0475 | Int. J. Mod. Phys. D 24, No. 4 (2015) 1550022 | 10.1142/S0218271815500224 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I derive general conditions in order to explain the origin of the Vainshtein
radius inside dRGT. The set of equations, which I have called "Vainshtein"
conditions are extremal conditions of the dynamical metric ($g_{\mu\nu}$)
containing all the degrees of freedom of the theory. The Vainshtein conditions
are able to e... | [
{
"created": "Mon, 4 Nov 2013 15:26:33 GMT",
"version": "v1"
},
{
"created": "Fri, 2 May 2014 12:20:39 GMT",
"version": "v2"
},
{
"created": "Sun, 11 May 2014 14:13:20 GMT",
"version": "v3"
},
{
"created": "Wed, 28 May 2014 05:06:34 GMT",
"version": "v4"
},
{
"cre... | 2014-12-30 | [
[
"Arraut",
"Ivan",
""
]
] | I derive general conditions in order to explain the origin of the Vainshtein radius inside dRGT. The set of equations, which I have called "Vainshtein" conditions are extremal conditions of the dynamical metric ($g_{\mu\nu}$) containing all the degrees of freedom of the theory. The Vainshtein conditions are able to exp... |
1201.5278 | Francesco Becattini | F. Becattini (University of Florence) | Covariant statistical mechanics and the stress-energy tensor | 4 pages. Final version accepted for publication in Phys. Rev. Lett | null | 10.1103/PhysRevLett.108.244502 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After recapitulating the covariant formalism of equilibrium statistical
mechanics in special relativity and extending it to the case of a non-vanishing
spin tensor, we show that the relativistic stress-energy tensor at
thermodynamical equilibrium can be obtained from a functional derivative of the
partition function ... | [
{
"created": "Wed, 25 Jan 2012 14:23:34 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2012 19:35:42 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Jun 2012 16:05:51 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Becattini",
"F.",
"",
"University of Florence"
]
] | After recapitulating the covariant formalism of equilibrium statistical mechanics in special relativity and extending it to the case of a non-vanishing spin tensor, we show that the relativistic stress-energy tensor at thermodynamical equilibrium can be obtained from a functional derivative of the partition function wi... |
gr-qc/0108083 | Peter Anninos | Peter Anninos | Computational Cosmology: from the Early Universe to the Large Scale
Structure | appearing, Living Reviews in Relativity | null | 10.12942/lrr-2001-2 | null | gr-qc | null | In order to account for the observable Universe, any comprehensive theory or
model of cosmology must draw from many disciplines of physics, including gauge
theories of strong and weak interactions, the hydrodynamics and microphysics of
baryonic matter, electromagnetic fields, and spacetime curvature, for example.
Alt... | [
{
"created": "Fri, 31 Aug 2001 00:50:27 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Anninos",
"Peter",
""
]
] | In order to account for the observable Universe, any comprehensive theory or model of cosmology must draw from many disciplines of physics, including gauge theories of strong and weak interactions, the hydrodynamics and microphysics of baryonic matter, electromagnetic fields, and spacetime curvature, for example. Altho... |
1809.00670 | Ion I. Cotaescu | Ion I. Cotaescu | Integral representation of the Feynman propagators of the Dirac fermions
on the de Sitter expanding universe | 5 pages, 1 figure. arXiv admin note: text overlap with
arXiv:1804.02842 | Eur. Phys. J. C (2018) 78:769 | 10.1140/epjc/s10052-018-6258-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The propagators of the Dirac fermions on the expanding portion of the
(1+3)-dimensional de Sitter spacetime are considered as mode sums in momentum
representation with a fixed vacuum of Bunch-Davies type. The principal result
reported here is a new integral representation of the Feynman propagators of
the massive and... | [
{
"created": "Mon, 3 Sep 2018 17:55:25 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Sep 2018 13:08:19 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Sep 2018 16:57:02 GMT",
"version": "v3"
}
] | 2018-10-17 | [
[
"Cotaescu",
"Ion I.",
""
]
] | The propagators of the Dirac fermions on the expanding portion of the (1+3)-dimensional de Sitter spacetime are considered as mode sums in momentum representation with a fixed vacuum of Bunch-Davies type. The principal result reported here is a new integral representation of the Feynman propagators of the massive and l... |
1810.11138 | Nobuyoshi Komatsu | Nobuyoshi Komatsu | Generalized thermodynamic constraints on holographic-principle-based
cosmological scenarios | Final version accepted for publication in PRD. Typos are fixed. [8
pages, 1 figure]. arXiv admin note: text overlap with arXiv:1707.09101 | Phys. Rev. D 99, 043523 (2019) | 10.1103/PhysRevD.99.043523 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The holographic principle can lead to cosmological scenarios, i.e.,
holographic equipartition models. In this model, an extra driving term
(corresponding to a time-varying cosmological term) in cosmological equations
depends on an associated entropy on the horizon of the universe. The driving
term is expected to be c... | [
{
"created": "Thu, 25 Oct 2018 23:37:45 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Feb 2019 23:46:02 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Feb 2019 00:20:45 GMT",
"version": "v3"
}
] | 2019-02-25 | [
[
"Komatsu",
"Nobuyoshi",
""
]
] | The holographic principle can lead to cosmological scenarios, i.e., holographic equipartition models. In this model, an extra driving term (corresponding to a time-varying cosmological term) in cosmological equations depends on an associated entropy on the horizon of the universe. The driving term is expected to be con... |
gr-qc/9812054 | Ken-ichi Oohara | Takashi Nakamura (YITP) and Ken-ichi Oohara (Niigata University) | A Way to 3D Numerical Relativity --- Coalescing Binary Neutron Stars --- | 11 pages, 9 figures, invited talk at Numerical Astrophysics 1998 | null | null | null | gr-qc astro-ph | null | One of the most promising sources of gravitational radiation is coalescence
of binary neutron stars or black holes. In order to study gravitational
radiation at the merging phase of coalescing binary neutron stars which is
called the last three-milliseconds, full general relativistic simulations are
required. Since c... | [
{
"created": "Wed, 16 Dec 1998 07:33:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nakamura",
"Takashi",
"",
"YITP"
],
[
"Oohara",
"Ken-ichi",
"",
"Niigata University"
]
] | One of the most promising sources of gravitational radiation is coalescence of binary neutron stars or black holes. In order to study gravitational radiation at the merging phase of coalescing binary neutron stars which is called the last three-milliseconds, full general relativistic simulations are required. Since coa... |
gr-qc/9608009 | Raphael Bousso | Raphael Bousso and Stephen W. Hawking (DAMTP, Cambridge) | Primordial Black Holes: Tunnelling vs. No Boundary Proposal | 14 pages, LaTeX, 1 figure; contribution to the proceedings of COSMION
96 | Grav.Cosmol.Suppl.4:28-37,1998 | null | DAMTP/R-96/34 | gr-qc astro-ph | null | In the inflationary era, black holes came into existence together with the
universe through the quantum process of pair creation. We calculate the pair
creation rate from the no boundary proposal for the wave function of the
universe. Our results are physically sensible and fit in with other
descriptions of pair crea... | [
{
"created": "Fri, 2 Aug 1996 19:06:26 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Bousso",
"Raphael",
"",
"DAMTP, Cambridge"
],
[
"Hawking",
"Stephen W.",
"",
"DAMTP, Cambridge"
]
] | In the inflationary era, black holes came into existence together with the universe through the quantum process of pair creation. We calculate the pair creation rate from the no boundary proposal for the wave function of the universe. Our results are physically sensible and fit in with other descriptions of pair creati... |
2407.17203 | Eleftherios-Ermis Tselentis | Eleftherios-Ermis Tselentis and \"Amin Baumeler | The M\"obius Game: A Quantum-Inspired Test of General Relativity | 5 pages, 4 figures, short version of arXiv:2309.15752 [qr-qc] with
new relativistic setup | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | We present a tight inequality to test the dynamical nature of spacetime. A
general-relativistic violation of that inequality certifies change of
curvature, in the same sense as a quantum-mechanical violation of a Bell
inequality certifies a source of entanglement. The inequality arises from a
minimal generalization o... | [
{
"created": "Wed, 24 Jul 2024 12:03:10 GMT",
"version": "v1"
}
] | 2024-07-26 | [
[
"Tselentis",
"Eleftherios-Ermis",
""
],
[
"Baumeler",
"Ämin",
""
]
] | We present a tight inequality to test the dynamical nature of spacetime. A general-relativistic violation of that inequality certifies change of curvature, in the same sense as a quantum-mechanical violation of a Bell inequality certifies a source of entanglement. The inequality arises from a minimal generalization of ... |
1109.1437 | Herbert Hamber | Herbert W. Hamber and Reiko Toriumi | Scale-Dependent Newton's Constant G in the Conformal Newtonian Gauge | 37 pages | null | 10.1103/PhysRevD.84.103507 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In classical gravity deviations from the predictions of the Einstein theory
are often discussed within the framework of the conformal Newtonian gauge,
where scalar perturbations are described by two potentials $\phi$ and $\psi$.
In this paper we use the above gauge to explore possible cosmological
consequences of a r... | [
{
"created": "Wed, 7 Sep 2011 12:40:04 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2011 21:54:21 GMT",
"version": "v2"
}
] | 2013-01-07 | [
[
"Hamber",
"Herbert W.",
""
],
[
"Toriumi",
"Reiko",
""
]
] | In classical gravity deviations from the predictions of the Einstein theory are often discussed within the framework of the conformal Newtonian gauge, where scalar perturbations are described by two potentials $\phi$ and $\psi$. In this paper we use the above gauge to explore possible cosmological consequences of a run... |
1810.04477 | Shibaji Banerjee | Shibaji Banerjee, Ashadul Halder, Sanjay K. Ghosh, Sibaji Raha,
Debasish Majumdar | Speeding up of Binary Merger Due to "Apparent" Gravitational Wave
Emissions | 17 Pages, 12 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from binary black hole pairs have emerged as an important
observational tool in current times. The energy of the BH - BH binary pair is
radiated in the form of gravitational waves and to compensate for that energy,
kinetic energy of the system decreases gradually. Consequently the mutual
separatio... | [
{
"created": "Wed, 10 Oct 2018 12:21:34 GMT",
"version": "v1"
}
] | 2018-10-11 | [
[
"Banerjee",
"Shibaji",
""
],
[
"Halder",
"Ashadul",
""
],
[
"Ghosh",
"Sanjay K.",
""
],
[
"Raha",
"Sibaji",
""
],
[
"Majumdar",
"Debasish",
""
]
] | Gravitational waves from binary black hole pairs have emerged as an important observational tool in current times. The energy of the BH - BH binary pair is radiated in the form of gravitational waves and to compensate for that energy, kinetic energy of the system decreases gradually. Consequently the mutual separation ... |
2006.16036 | Joao Magueijo | John D. Barrow and Joao Magueijo | A contextual Planck parameter and the classical limit in quantum
cosmology | null | null | 10.1007/s10701-021-00433-0 | null | gr-qc astro-ph.CO quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that whatever quantity controls the Heisenberg uncertainty
relations (for a given complementary pair of observables) it should be
identified with an effective Planck parameter. With this definition it is not
difficult to find examples where the Planck parameter depends on the region
under study, varies in ... | [
{
"created": "Mon, 29 Jun 2020 13:29:29 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jan 2021 18:45:27 GMT",
"version": "v2"
}
] | 2021-03-17 | [
[
"Barrow",
"John D.",
""
],
[
"Magueijo",
"Joao",
""
]
] | We propose that whatever quantity controls the Heisenberg uncertainty relations (for a given complementary pair of observables) it should be identified with an effective Planck parameter. With this definition it is not difficult to find examples where the Planck parameter depends on the region under study, varies in ti... |
gr-qc/0001032 | Alec Maassen van den Brink | Alec Maassen van den Brink | Analytic treatment of black-hole gravitational waves at the
algebraically special frequency | REVTeX, 17 pages, submitted to Phys. Rev. D | Phys.Rev. D62 (2000) 064009 | 10.1103/PhysRevD.62.064009 | ITFA 2000-02 | gr-qc | null | We study the Regge-Wheeler and Zerilli equations (RWE and ZE) at the
`algebraically special frequency' $\Omega$, where these equations admit an
exact solution (elaborated here), generating the SUSY relationship between
them. The physical significance of the SUSY generator and of the solutions at
$\Omega$ in general i... | [
{
"created": "Tue, 11 Jan 2000 23:38:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Brink",
"Alec Maassen van den",
""
]
] | We study the Regge-Wheeler and Zerilli equations (RWE and ZE) at the `algebraically special frequency' $\Omega$, where these equations admit an exact solution (elaborated here), generating the SUSY relationship between them. The physical significance of the SUSY generator and of the solutions at $\Omega$ in general is ... |
1605.06026 | De-Chang Dai | De-Chang Dai, Dejan Stojkovic | Collapsing objects with the same gravitational trajectory can radiate
away different amount of energy | 5 pages, 5 figures, accepted by PLB. arXiv admin note: text overlap
with arXiv:1601.07921 | Physics Letters B, 758, 412-415 (2016) | 10.1016/j.physletb.2016.05.036 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study radiation emitted during the gravitational collapse from two
different types of shells. We assume that one shell is made of dark matter and
is completely transparent to the test scalar (for simplicity) field which
belongs to the standard model, while the other shell is made of the standard
model particles an... | [
{
"created": "Fri, 13 May 2016 01:33:44 GMT",
"version": "v1"
}
] | 2016-05-31 | [
[
"Dai",
"De-Chang",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | We study radiation emitted during the gravitational collapse from two different types of shells. We assume that one shell is made of dark matter and is completely transparent to the test scalar (for simplicity) field which belongs to the standard model, while the other shell is made of the standard model particles and ... |
gr-qc/0310121 | Yuri Obukhov | Yuri N. Obukhov | Generalized plane-fronted gravitational waves in any dimension | Revtex, 18 pages, no figures | Phys.Rev. D69 (2004) 024013 | 10.1103/PhysRevD.69.024013 | null | gr-qc hep-th | null | We study the gravitational waves in spacetimes of arbitrary dimension. They
generalize the pp-waves and the Kundt waves, obtained earlier in four
dimensions. Explicit solutions of the Einstein and Einstein-Maxwell equations
are derived for an arbitrary cosmological constant.
| [
{
"created": "Wed, 29 Oct 2003 19:18:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Obukhov",
"Yuri N.",
""
]
] | We study the gravitational waves in spacetimes of arbitrary dimension. They generalize the pp-waves and the Kundt waves, obtained earlier in four dimensions. Explicit solutions of the Einstein and Einstein-Maxwell equations are derived for an arbitrary cosmological constant. |
2212.11948 | Horng Sheng Chia | Horng Sheng Chia, Christoffel Doorman, Alexandra Wernersson, Tanja
Hinderer, Samaya Nissanke | Self-Interacting Gravitational Atoms in the Strong-Gravity Regime | 27 pages, 10 figures | null | 10.1088/1475-7516/2023/04/018 | null | gr-qc hep-ph hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We numerically investigate free and self-interacting ultralight scalar fields
around black holes in General Relativity. We focus on complex scalar fields
$\Phi$ whose self-interactions are described by the quartic potential $V
\propto \lambda |\Phi|^4$, and ignore the black hole spin in order to
disentangle the effec... | [
{
"created": "Thu, 22 Dec 2022 18:34:22 GMT",
"version": "v1"
}
] | 2023-04-19 | [
[
"Chia",
"Horng Sheng",
""
],
[
"Doorman",
"Christoffel",
""
],
[
"Wernersson",
"Alexandra",
""
],
[
"Hinderer",
"Tanja",
""
],
[
"Nissanke",
"Samaya",
""
]
] | We numerically investigate free and self-interacting ultralight scalar fields around black holes in General Relativity. We focus on complex scalar fields $\Phi$ whose self-interactions are described by the quartic potential $V \propto \lambda |\Phi|^4$, and ignore the black hole spin in order to disentangle the effects... |
1510.07400 | Hiromu Ogawa | Hiromu Ogawa, Tsutomu Kobayashi, Teruaki Suyama | Instability of hairy black holes in shift-symmetric Horndeski theories | 9 pages, version accepted for publication in Physical Review D; Error
corrected in Section 3, Appendix A and Appendix B, results unchanged | Phys. Rev. D 93, 064078 (2016) | 10.1103/PhysRevD.93.064078 | RUP-15-22, RESCEU-27/15 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently it was pointed out that in shift-symmetric scalar-tensor theories a
black hole can have nontrivial scalar hair which depends linearly on time. We
develop black hole perturbation theory for such solutions and compute the
quadratic action of odd-parity perturbations. We show that around all the
solutions known... | [
{
"created": "Mon, 26 Oct 2015 08:35:17 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Apr 2016 08:29:06 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Sep 2016 09:03:03 GMT",
"version": "v3"
}
] | 2016-09-13 | [
[
"Ogawa",
"Hiromu",
""
],
[
"Kobayashi",
"Tsutomu",
""
],
[
"Suyama",
"Teruaki",
""
]
] | Recently it was pointed out that in shift-symmetric scalar-tensor theories a black hole can have nontrivial scalar hair which depends linearly on time. We develop black hole perturbation theory for such solutions and compute the quadratic action of odd-parity perturbations. We show that around all the solutions known s... |
2011.02515 | Yosef Verbin | Y. Verbin | Magnetic and Electric Black Holes in the Vector-Tensor Horndeski Theory | 30 pages, significantly expanded version + title change. Accepted for
publication in PRD | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct exact solutions of magnetically charged black holes in the
vector-tensor Horndeski gravity and discuss their main features. Unlike the
analogous electric case, the field equations are linear in a simple (quite
standard) parametrization of the metric tensor and they can be solved
analytically even when a ... | [
{
"created": "Wed, 4 Nov 2020 19:43:07 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Nov 2020 09:37:35 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Jul 2022 05:13:08 GMT",
"version": "v3"
}
] | 2022-07-18 | [
[
"Verbin",
"Y.",
""
]
] | We construct exact solutions of magnetically charged black holes in the vector-tensor Horndeski gravity and discuss their main features. Unlike the analogous electric case, the field equations are linear in a simple (quite standard) parametrization of the metric tensor and they can be solved analytically even when a co... |
2104.01917 | Mehdi Shokri | Mehdi Shokri, Jafar Sadeghi and Mohammad Reza Setare | The generalized $sl(2, R)$ and $su(1, 1)$ in non-minimal constant-roll
inflation | 6 pages | null | 10.1016/j.aop.2021.168487 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In the present work, we consider the non-minimal coupling inflationary model
in the context of the constant-roll idea which is investigated by the
first-order formalism. We attempt to find the hidden symmetries behind the
model by the Lie symmetry method. We supply this aim by using the symmetry
features of the Heun ... | [
{
"created": "Wed, 31 Mar 2021 13:12:37 GMT",
"version": "v1"
}
] | 2021-06-02 | [
[
"Shokri",
"Mehdi",
""
],
[
"Sadeghi",
"Jafar",
""
],
[
"Setare",
"Mohammad Reza",
""
]
] | In the present work, we consider the non-minimal coupling inflationary model in the context of the constant-roll idea which is investigated by the first-order formalism. We attempt to find the hidden symmetries behind the model by the Lie symmetry method. We supply this aim by using the symmetry features of the Heun fu... |
1602.05949 | Giuseppe Congedo | Giuseppe Congedo and Fabrizio De Marchi | Testing the Strong Equivalence Principle with spacecraft ranging towards
the nearby Lagrangian points | 8 pages, 2 figures, 2 tables | Phys. Rev. D 93, 102003 (2016) | 10.1103/PhysRevD.93.102003 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity is supported by great experimental evidence. Yet there is
a lot of interest in precisely setting its limits with on going and future
experiments. A question to answer is about the validity of the Strong
Equivalence Principle. Ground experiments and Lunar Laser Ranging have provided
the best upper l... | [
{
"created": "Thu, 18 Feb 2016 20:57:50 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Apr 2016 12:12:33 GMT",
"version": "v2"
}
] | 2016-05-11 | [
[
"Congedo",
"Giuseppe",
""
],
[
"De Marchi",
"Fabrizio",
""
]
] | General relativity is supported by great experimental evidence. Yet there is a lot of interest in precisely setting its limits with on going and future experiments. A question to answer is about the validity of the Strong Equivalence Principle. Ground experiments and Lunar Laser Ranging have provided the best upper lim... |
2211.14179 | Julian Barbour | Julian Barbour | Time's Arrow and Simultaneity: A Critique of Rovelli's Views | 6 pages, 1 figure | null | null | null | gr-qc cond-mat.stat-mech physics.hist-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In the joint paper "Bridging the neuroscience and physics of time" Rovelli,
as the physicist coauthor of neuroscientist Dean Buonomano, makes statements
that rely on theoretical frameworks employed when the laws of thermodynamics
and general relativity were discovered. Their reconsideration in the light of
subsequent... | [
{
"created": "Fri, 25 Nov 2022 15:34:30 GMT",
"version": "v1"
}
] | 2022-11-28 | [
[
"Barbour",
"Julian",
""
]
] | In the joint paper "Bridging the neuroscience and physics of time" Rovelli, as the physicist coauthor of neuroscientist Dean Buonomano, makes statements that rely on theoretical frameworks employed when the laws of thermodynamics and general relativity were discovered. Their reconsideration in the light of subsequent i... |
gr-qc/0112046 | Yuan-xing Gui | D. Yu, Y.-X. Gui, and X. Ye | The Relation of Thermal Fluctuation and Information-Entropy for
One-Dimensional Rindler Oscillator | 14 pages, 1 figure | Mod.Phys.Lett. A16 (2001) 2241-2248 | 10.1142/S0217732301005618 | gr-qc/0112046 | gr-qc | null | Within the framework of thermo-field-dynamics (TFD), the
information-entropies associated with the measurements of position and momentum
for one-dimensional Rindler oscillator are derived, and the connection between
its information-entropy and thermal fluctuation is obtained. A conclusion is
drawn that the thermal fl... | [
{
"created": "Wed, 19 Dec 2001 10:36:52 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Dec 2001 01:36:38 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Yu",
"D.",
""
],
[
"Gui",
"Y. -X.",
""
],
[
"Ye",
"X.",
""
]
] | Within the framework of thermo-field-dynamics (TFD), the information-entropies associated with the measurements of position and momentum for one-dimensional Rindler oscillator are derived, and the connection between its information-entropy and thermal fluctuation is obtained. A conclusion is drawn that the thermal fluc... |
gr-qc/0212059 | Edmundo M. Monte | Edmundo M. Monte (U.F.Paraiba) and M.D.Maia (U.Brasilia) | On Schwarzschild's Topology in Brane-Worlds | 6 pages | Int.J.Mod.Phys.A17:4355-4358,2002 | 10.1142/S0217751X02013411 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The topological structure of Schwarzschild's space-time and its maximal
analytic extension are investigated in context of brane-worlds. Using the
embedding coordinates, these geometries are seen as different states of the
evolution of a single brane-world. Comparing the topologies and the embeddings
it is shown that ... | [
{
"created": "Fri, 13 Dec 2002 18:06:37 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2011 11:18:32 GMT",
"version": "v2"
}
] | 2011-11-30 | [
[
"Monte",
"Edmundo M.",
"",
"U.F.Paraiba"
],
[
"Maia",
"M. D.",
"",
"U.Brasilia"
]
] | The topological structure of Schwarzschild's space-time and its maximal analytic extension are investigated in context of brane-worlds. Using the embedding coordinates, these geometries are seen as different states of the evolution of a single brane-world. Comparing the topologies and the embeddings it is shown that th... |
gr-qc/9707018 | null | Roy Maartens and Josep Triginer | Density perturbations with relativistic thermodynamics | Minor corrections to some equations. To appear Phys. Rev. D | Phys.Rev. D56 (1997) 4640-4650 | 10.1103/PhysRevD.56.4640 | null | gr-qc astro-ph | null | We investigate cosmological density perturbations in a covariant and
gauge-invariant formalism, incorporating relativistic causal thermodynamics to
give a self-consistent description. The gradient of density inhomogeneities
splits covariantly into a scalar part, equivalent to the usual density
perturbations, a rotati... | [
{
"created": "Tue, 8 Jul 1997 16:24:43 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 1997 08:33:50 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Maartens",
"Roy",
""
],
[
"Triginer",
"Josep",
""
]
] | We investigate cosmological density perturbations in a covariant and gauge-invariant formalism, incorporating relativistic causal thermodynamics to give a self-consistent description. The gradient of density inhomogeneities splits covariantly into a scalar part, equivalent to the usual density perturbations, a rotation... |
2406.13521 | Gianluca Calcagni | Ido Ben-Dayan, Gianluca Calcagni, Maurizio Gasperini, Anupam Mazumdar,
Eliseo Pavone, Udaykrishna Thattarampilly, Amresh Verma | Gravitational-wave background in bouncing models from semi-classical,
quantum and string gravity | 1+33 pages, 4 figures | null | null | ET-0386A-24 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the primordial spectra and the gravitational-wave background (GWB)
of three models of semi-classical, quantum or string gravity where the big bang
is replaced by a bounce and the tensor spectrum is blue-tilted: ekpyrotic
universe with fast-rolling Galileons, string-gas cosmology with Atick-Witten
conjecture ... | [
{
"created": "Wed, 19 Jun 2024 13:06:39 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Ben-Dayan",
"Ido",
""
],
[
"Calcagni",
"Gianluca",
""
],
[
"Gasperini",
"Maurizio",
""
],
[
"Mazumdar",
"Anupam",
""
],
[
"Pavone",
"Eliseo",
""
],
[
"Thattarampilly",
"Udaykrishna",
""
],
[
"Verma",
"Amresh",... | We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce and the tensor spectrum is blue-tilted: ekpyrotic universe with fast-rolling Galileons, string-gas cosmology with Atick-Witten conjecture an... |
gr-qc/9808051 | Klemm Dietmar | Dietmar Klemm | Topological Black Holes in Weyl Conformal Gravity | 9 pages, revtex, no figures. To appear in Classical and Quantum
Gravity | Class.Quant.Grav. 15 (1998) 3195-3201 | 10.1088/0264-9381/15/10/020 | UTF 414 | gr-qc | null | We present a class of exact solutions of Weyl conformal gravity, which have
an interpretation as topological black holes. Solutions with negative, zero or
positive scalar curvature at infinity are found, the former generalizing the
well-known topological black holes in anti-de Sitter gravity. The rather
delicate ques... | [
{
"created": "Wed, 19 Aug 1998 11:43:27 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Klemm",
"Dietmar",
""
]
] | We present a class of exact solutions of Weyl conformal gravity, which have an interpretation as topological black holes. Solutions with negative, zero or positive scalar curvature at infinity are found, the former generalizing the well-known topological black holes in anti-de Sitter gravity. The rather delicate questi... |
1605.06390 | Fredy Dubeibe | F. L. Dubeibe and Jos\'e D. Sanabria-G\'omez | Geodesic motion in a stationary dihole spacetime | 10 pages, 9 figures | Phys. Rev. D 94, 044058 (2016) | 10.1103/PhysRevD.94.044058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The knowledge of the properties of the different exact solutions modeling
binary systems, is a necessary step towards the classification of physically
suitable solutions and its corresponding limits of applicability. In the
present paper, we perform an analysis of the geodesics around two
counter--rotating Kerr--Newm... | [
{
"created": "Fri, 20 May 2016 15:01:42 GMT",
"version": "v1"
}
] | 2016-09-07 | [
[
"Dubeibe",
"F. L.",
""
],
[
"Sanabria-Gómez",
"José D.",
""
]
] | The knowledge of the properties of the different exact solutions modeling binary systems, is a necessary step towards the classification of physically suitable solutions and its corresponding limits of applicability. In the present paper, we perform an analysis of the geodesics around two counter--rotating Kerr--Newman... |
2010.13394 | Yiding Jia | Lina Wu, Qing Gao, Yungui Gong, Yiding Jia and Tianjun Li | The Upper Bound on the Tensor-to-Scalar Ratio Consistent with Quantum
Gravity | 12 pages | null | 10.1088/1572-9494/abf824 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the polynomial inflation with the tensor-to-scalar ratio as large
as possible which can be consistent with the Quantum Gravity (QG) corrections
and Effective Field Theory (EFT). To get a minimal field excursion $\Delta\phi$
for enough e-folding number $N$, the inflaton field traverses an extremely flat
pa... | [
{
"created": "Mon, 26 Oct 2020 07:43:31 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Wu",
"Lina",
""
],
[
"Gao",
"Qing",
""
],
[
"Gong",
"Yungui",
""
],
[
"Jia",
"Yiding",
""
],
[
"Li",
"Tianjun",
""
]
] | We consider the polynomial inflation with the tensor-to-scalar ratio as large as possible which can be consistent with the Quantum Gravity (QG) corrections and Effective Field Theory (EFT). To get a minimal field excursion $\Delta\phi$ for enough e-folding number $N$, the inflaton field traverses an extremely flat part... |
1407.2446 | Mariam Bouhmadi-Lopez | Mariam Bouhmadi-Lopez, Ahmed Errahmani, Prado Martin-Moruno, Taoufik
Ouali, Yaser Tavakoli | The little sibling of the big rip singularity | 20 pages, 4 figures, clarifications included | Int.J.Mod.Phys.D Vol. 24, No. 10 (2015) 1550078 (20 pages) | 10.1142/S0218271815500789 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new cosmological event, which we named the little sibling of the
big rip. This event is much smoother than the big rip singularity. When the
little sibling of the big rip is reached, the Hubble rate and the scale factor
blow up but the cosmic derivative of the Hubble rate does not. This abrupt
event take... | [
{
"created": "Wed, 9 Jul 2014 12:01:57 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 2015 08:01:53 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Bouhmadi-Lopez",
"Mariam",
""
],
[
"Errahmani",
"Ahmed",
""
],
[
"Martin-Moruno",
"Prado",
""
],
[
"Ouali",
"Taoufik",
""
],
[
"Tavakoli",
"Yaser",
""
]
] | We present a new cosmological event, which we named the little sibling of the big rip. This event is much smoother than the big rip singularity. When the little sibling of the big rip is reached, the Hubble rate and the scale factor blow up but the cosmic derivative of the Hubble rate does not. This abrupt event takes ... |
gr-qc/0012010 | Hideyuki Tagoshi | Hideyuki Tagoshi, Nobuyuki Kanda, Takahiro Tanaka, Daisuke Tatsumi,
Souichi Telada, et al. (The TAMA Collaboration) | The First Search for Gravitational Waves from Inspiraling Compact
Binaries using TAMA300 data | 5 pages, 4 figures. To appear Phsical Review D | Phys.Rev.D63:062001,2001 | 10.1103/PhysRevD.63.062001 | ICRR-Report-469-2000-13, OU-TAP-153 | gr-qc astro-ph | null | We analyzed 6 hours of data from the TAMA300 detector by matched filtering,
searching for gravitational waves from inspiraling compact binaries. We
incorporated a two-step hierarchical search strategy in matched filtering. We
obtained an upper limit of 0.59/hour (C.L.=90%) on the event rate of inspirals
of compact bi... | [
{
"created": "Mon, 4 Dec 2000 08:10:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Tagoshi",
"Hideyuki",
""
],
[
"Kanda",
"Nobuyuki",
""
],
[
"Tanaka",
"Takahiro",
""
],
[
"Tatsumi",
"Daisuke",
""
],
[
"Telada",
"Souichi",
""
]
] | We analyzed 6 hours of data from the TAMA300 detector by matched filtering, searching for gravitational waves from inspiraling compact binaries. We incorporated a two-step hierarchical search strategy in matched filtering. We obtained an upper limit of 0.59/hour (C.L.=90%) on the event rate of inspirals of compact bina... |
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