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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9604013 | Int. Lab. HTSC and Sse | Sergiu I. Vacaru | Locally Anisotropic Gravity and Strings | 49 pages, Revtex, a short variant is submitted to Nucl. Phys. B | Annals Phys. 256 (1997) 39-61 | 10.1006/aphy.1996.5661 | null | gr-qc dg-ga hep-th math.DG | null | An introduction into the theory of locally anisotropic spaces (modelled as
vector bundles provided with compatible nonlinear and distinguished linear
connections and metric structures and containing as particular cases different
types of Kaluza--Klein and/or extensions of Lagrange and Finsler spaces) is
presented. Th... | [
{
"created": "Fri, 5 Apr 1996 14:25:23 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Vacaru",
"Sergiu I.",
""
]
] | An introduction into the theory of locally anisotropic spaces (modelled as vector bundles provided with compatible nonlinear and distinguished linear connections and metric structures and containing as particular cases different types of Kaluza--Klein and/or extensions of Lagrange and Finsler spaces) is presented. The ... |
gr-qc/0406006 | Martin Tajmar | M. Tajmar, C. de Matos | Extended Analysis of Gravitomagnetic Fields in Rotating Superconductors
and Superfluids | null | null | 10.1016/j.physc.2005.01.008 | null | gr-qc | null | Applying the Ginzburg-Landau theory including frame dragging effects to the
case of a rotating superconductor, we were able to express the absolute value
of the gravitomagnetic field involved to explain the Cooper pair mass anomaly
previously reported by Tate. Although our analysis predicts large
gravitomagnetic fiel... | [
{
"created": "Wed, 2 Jun 2004 14:32:25 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Tajmar",
"M.",
""
],
[
"de Matos",
"C.",
""
]
] | Applying the Ginzburg-Landau theory including frame dragging effects to the case of a rotating superconductor, we were able to express the absolute value of the gravitomagnetic field involved to explain the Cooper pair mass anomaly previously reported by Tate. Although our analysis predicts large gravitomagnetic fields... |
2202.02941 | Maximiliano Isi | Maximiliano Isi and Will M. Farr | Revisiting the ringdown of GW150914 | 5 pages, 7 figures (v2 updates Fig 1 to display full posterior) | null | null | LIGO-P2200028 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We examine recent claims that evidence for an overtone in the ringdown of the
GW150914 binary black hole merger was a result of noise anomalies. We cannot
reproduce these claims, finding that our previous analysis of this event is
robust to data analysis choices and consistent with the expectation that strain
after t... | [
{
"created": "Mon, 7 Feb 2022 05:00:53 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Feb 2022 19:53:43 GMT",
"version": "v2"
}
] | 2022-02-22 | [
[
"Isi",
"Maximiliano",
""
],
[
"Farr",
"Will M.",
""
]
] | We examine recent claims that evidence for an overtone in the ringdown of the GW150914 binary black hole merger was a result of noise anomalies. We cannot reproduce these claims, finding that our previous analysis of this event is robust to data analysis choices and consistent with the expectation that strain after the... |
2010.00935 | Sunil Choudhary | Sunil Choudhary, Nicolas Sanchis-Gual, Anshu Gupta, Juan Carlos
Degollado, Sukanta Bose, Jos\'e A. Font | Gravitational waves from binary black hole mergers surrounded by scalar
field clouds: Numerical simulations and observational implications | 13 pages, 11 figures, 2 captioned figures added(total 3 figures),
Accepted for publication in Physical Review D. Includes a second appendix and
a few additional references | Phys. Rev. D 103, 044032 (2021) | 10.1103/PhysRevD.103.044032 | LIGO preprint number LIGO-2000375 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how gravitational-wave observations of binary black hole (BBH)
mergers can constrain the physical characteristics of a scalar field cloud
parameterized by mass $\tilde{\mu}$ and strength $\phi_0$ that may surround
them. We numerically study the inspiraling equal-mass, non-spinning BBH systems
dressed in such ... | [
{
"created": "Fri, 2 Oct 2020 12:05:59 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2021 11:53:49 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jan 2021 05:04:26 GMT",
"version": "v3"
}
] | 2021-02-19 | [
[
"Choudhary",
"Sunil",
""
],
[
"Sanchis-Gual",
"Nicolas",
""
],
[
"Gupta",
"Anshu",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Bose",
"Sukanta",
""
],
[
"Font",
"José A.",
""
]
] | We show how gravitational-wave observations of binary black hole (BBH) mergers can constrain the physical characteristics of a scalar field cloud parameterized by mass $\tilde{\mu}$ and strength $\phi_0$ that may surround them. We numerically study the inspiraling equal-mass, non-spinning BBH systems dressed in such cl... |
gr-qc/0506096 | Ignacio Navarro | Ignacio Navarro and Karel Van Acoleyen | On the Newtonian limit of Generalized Modified Gravity Models | 7 pages, latex | Phys.Lett. B622 (2005) 1-5 | 10.1016/j.physletb.2005.07.008 | IPPP/05/27, DCPT/05/54 | gr-qc astro-ph hep-th | null | We consider the Newtonian limit of modified theories of gravity that include
inverse powers of the curvature in the action in order to explain the cosmic
acceleration. It has been shown that the simplest models of this kind are in
conflict with observations at the solar system level. In this letter we point
out that ... | [
{
"created": "Fri, 17 Jun 2005 17:18:02 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Navarro",
"Ignacio",
""
],
[
"Van Acoleyen",
"Karel",
""
]
] | We consider the Newtonian limit of modified theories of gravity that include inverse powers of the curvature in the action in order to explain the cosmic acceleration. It has been shown that the simplest models of this kind are in conflict with observations at the solar system level. In this letter we point out that wh... |
1602.06113 | Nicola Tamanini | Jibitesh Dutta, Wompherdeiki Khyllep and Nicola Tamanini | Cosmological dynamics of scalar fields with kinetic corrections: Beyond
the exponential potential | 18 pages, 11 figures, 4 tables, accepted by Phys. Rev. D; v2:
acknowledgements added | Phys. Rev. D 93, 063004 (2016) | 10.1103/PhysRevD.93.063004 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We expand the dynamical systems investigation of cosmological scalar fields
characterised by kinetic corrections presented in [N. Tamanini, Phys. Rev. D 89
(2014) 083521]. In particular we do not restrict the analysis to exponential
potentials only, but we consider arbitrary scalar field potentials and derive
general... | [
{
"created": "Fri, 19 Feb 2016 11:16:29 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2017 15:13:12 GMT",
"version": "v2"
}
] | 2017-03-09 | [
[
"Dutta",
"Jibitesh",
""
],
[
"Khyllep",
"Wompherdeiki",
""
],
[
"Tamanini",
"Nicola",
""
]
] | We expand the dynamical systems investigation of cosmological scalar fields characterised by kinetic corrections presented in [N. Tamanini, Phys. Rev. D 89 (2014) 083521]. In particular we do not restrict the analysis to exponential potentials only, but we consider arbitrary scalar field potentials and derive general r... |
1602.07309 | Paolo Pani | Vitor Cardoso, Edgardo Franzin, Paolo Pani | Is the gravitational-wave ringdown a probe of the event horizon? | 6 pages, 4 figures. Version published as Editors' Suggestion in
Physical Review Letters. v4: includes Erratum correcting the caption of
Fig.4. All conclusions remain unchanged | Phys. Rev. Lett. 116, 171101 (2016) | 10.1103/PhysRevLett.116.171101 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is commonly believed that the ringdown signal from a binary coalescence
provides a conclusive proof for the formation of an event horizon after the
merger. This expectation is based on the assumption that the ringdown waveform
at intermediate times is dominated by the quasinormal modes of the final
object. We poin... | [
{
"created": "Tue, 23 Feb 2016 21:00:09 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2016 13:24:26 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Apr 2016 17:00:30 GMT",
"version": "v3"
},
{
"created": "Thu, 18 Aug 2016 10:26:07 GMT",
"version": "v4"
}
] | 2016-08-19 | [
[
"Cardoso",
"Vitor",
""
],
[
"Franzin",
"Edgardo",
""
],
[
"Pani",
"Paolo",
""
]
] | It is commonly believed that the ringdown signal from a binary coalescence provides a conclusive proof for the formation of an event horizon after the merger. This expectation is based on the assumption that the ringdown waveform at intermediate times is dominated by the quasinormal modes of the final object. We point ... |
2404.07524 | Sander M. Vermeulen | Sander M. Vermeulen, Torrey Cullen, Daniel Grass, Ian A. O. MacMillan,
Alexander J. Ramirez, Jeffrey Wack, Boris Korzh, Vincent S. H. Lee, Kathryn
M. Zurek, Chris Stoughton, Lee McCuller | Photon Counting Interferometry to Detect Geontropic Space-Time
Fluctuations with GQuEST | null | null | null | null | gr-qc astro-ph.IM physics.ins-det quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The GQuEST (Gravity from the Quantum Entanglement of Space-Time) experiment
uses tabletop-scale Michelson laser interferometers to probe for fluctuations
in space-time. We present an interferometer design featuring a novel photon
counting readout method that provides unprecedented sensitivity, as it is not
subject to... | [
{
"created": "Thu, 11 Apr 2024 07:38:36 GMT",
"version": "v1"
}
] | 2024-04-12 | [
[
"Vermeulen",
"Sander M.",
""
],
[
"Cullen",
"Torrey",
""
],
[
"Grass",
"Daniel",
""
],
[
"MacMillan",
"Ian A. O.",
""
],
[
"Ramirez",
"Alexander J.",
""
],
[
"Wack",
"Jeffrey",
""
],
[
"Korzh",
"Boris",
""
... | The GQuEST (Gravity from the Quantum Entanglement of Space-Time) experiment uses tabletop-scale Michelson laser interferometers to probe for fluctuations in space-time. We present an interferometer design featuring a novel photon counting readout method that provides unprecedented sensitivity, as it is not subject to t... |
1808.04188 | Aneta Wojnar | Aneta Wojnar | Polytropic stars in Palatini gravity | 8 pages, 1 table, 3 figures, version accepted to EPJC | A. Eur. Phys. J. C (2019) 79: 51 | 10.1140/epjc/s10052-019-6555-4 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have derived a modified Lane-Emden equation for the Starobinsky model in
Palatini gravity which is numerically solvable. Comparing the results to the
ones provided by General Relativity we observe a significant difference
depending on the theory parameter for the $M-R$ relations.
| [
{
"created": "Mon, 13 Aug 2018 13:03:38 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2019 14:32:21 GMT",
"version": "v2"
}
] | 2019-01-23 | [
[
"Wojnar",
"Aneta",
""
]
] | We have derived a modified Lane-Emden equation for the Starobinsky model in Palatini gravity which is numerically solvable. Comparing the results to the ones provided by General Relativity we observe a significant difference depending on the theory parameter for the $M-R$ relations. |
gr-qc/0402029 | Albert Roura | B. L. Hu, Albert Roura and Enric Verdaguer | Induced quantum metric fluctuations and the validity of semiclassical
gravity | 28 pages, REVTeX4, 2 figures | Phys.Rev. D70 (2004) 044002 | 10.1103/PhysRevD.70.044002 | umdpp 03-67 | gr-qc | null | We propose a criterion for the validity of semiclassical gravity (SCG) which
is based on the stability of the solutions of SCG with respect to quantum
metric fluctuations. We pay special attention to the two-point quantum
correlation functions for the metric perturbations, which contain both
intrinsic and induced flu... | [
{
"created": "Wed, 4 Feb 2004 23:27:28 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Hu",
"B. L.",
""
],
[
"Roura",
"Albert",
""
],
[
"Verdaguer",
"Enric",
""
]
] | We propose a criterion for the validity of semiclassical gravity (SCG) which is based on the stability of the solutions of SCG with respect to quantum metric fluctuations. We pay special attention to the two-point quantum correlation functions for the metric perturbations, which contain both intrinsic and induced fluct... |
1009.3005 | Ettore Minguzzi | E. Minguzzi | Clocks' synchronization without round-trip conditions | 21 pages, no figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Poincar\'e-Einstein's synchronization convention is transitive, and thus
leads to a consistent synchronization, only if some form of round-trip property
is satisfied. An improved version is given here which does not suffer from this
limitation and which therefore may find application in physics, computer
science and ... | [
{
"created": "Wed, 15 Sep 2010 19:39:14 GMT",
"version": "v1"
}
] | 2010-09-16 | [
[
"Minguzzi",
"E.",
""
]
] | Poincar\'e-Einstein's synchronization convention is transitive, and thus leads to a consistent synchronization, only if some form of round-trip property is satisfied. An improved version is given here which does not suffer from this limitation and which therefore may find application in physics, computer science and co... |
gr-qc/0305106 | George E. A. Matsas | George E. A. Matsas | Relativistic Arquimedes law for fast moving bodies and the
general-relativistic resolution of the "submarine paradox" | 4 pages (REVTEX) (compact manuscript version) | Phys.Rev. D68 (2003) 027701 | 10.1103/PhysRevD.68.027701 | null | gr-qc | null | We investigate and solve in the context of General Relativity the apparent
paradox which appears when bodies floating in a background fluid are set in
relativistic motion. Suppose some macroscopic body, say, a submarine designed
to lie just in equilibrium when it rests (totally) immersed in a certain
background fluid... | [
{
"created": "Wed, 28 May 2003 19:18:08 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Matsas",
"George E. A.",
""
]
] | We investigate and solve in the context of General Relativity the apparent paradox which appears when bodies floating in a background fluid are set in relativistic motion. Suppose some macroscopic body, say, a submarine designed to lie just in equilibrium when it rests (totally) immersed in a certain background fluid. ... |
gr-qc/0101077 | Thomas B. Bahder | Thomas B. Bahder | Navigation in Curved Space-Time | null | Am.J.Phys. 69 (2001) 315-321 | 10.1119/1.1326078 | null | gr-qc | null | A covariant and invariant theory of navigation in curved space-time with
respect to electromagnetic beacons is written in terms of J. L. Synge's
two-point invariant world function. Explicit equations are given for navigation
in space-time in the vicinity of the Earth in Schwarzschild coordinates and in
rotating coord... | [
{
"created": "Thu, 18 Jan 2001 21:23:34 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bahder",
"Thomas B.",
""
]
] | A covariant and invariant theory of navigation in curved space-time with respect to electromagnetic beacons is written in terms of J. L. Synge's two-point invariant world function. Explicit equations are given for navigation in space-time in the vicinity of the Earth in Schwarzschild coordinates and in rotating coordin... |
1811.00317 | N V Krishnendu | N. V. Krishnendu, Chandra Kant Mishra, K. G. Arun | Spin-induced deformations and tests of binary black hole nature using
third-generation detectors | 11 pages, 17 figures, Added a figure and a discussion regarding the
bounds using a population of compact binaries. Matches with the published
version in PRD | Phys. Rev. D 99, 064008 (2019) | 10.1103/PhysRevD.99.064008 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent letter [N. V. Krishnendu et al., PRL 119, 091101 (2017)] we
explored the possibility of probing the binary black hole nature of coalescing
compact binaries, by measuring their spin-induced multipole moments, observed
in advanced LIGO detectors. Coefficients characterizing the spin-induced
multipole moment... | [
{
"created": "Thu, 1 Nov 2018 11:15:21 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Mar 2019 06:17:28 GMT",
"version": "v2"
}
] | 2019-03-13 | [
[
"Krishnendu",
"N. V.",
""
],
[
"Mishra",
"Chandra Kant",
""
],
[
"Arun",
"K. G.",
""
]
] | In a recent letter [N. V. Krishnendu et al., PRL 119, 091101 (2017)] we explored the possibility of probing the binary black hole nature of coalescing compact binaries, by measuring their spin-induced multipole moments, observed in advanced LIGO detectors. Coefficients characterizing the spin-induced multipole moments ... |
gr-qc/9807005 | Keisuke Taniguchi | Keisuke Taniguchi and Masaru Shibata | Gravitational radiation from corotating binary neutron stars of
incompressible fluid in the first post-Newtonian approximation of general
relativity | 26 pages, revtex, 9 figures(eps), accepted for publication in Phys.
Rev. D | Phys.Rev. D58 (1998) 084012 | 10.1103/PhysRevD.58.084012 | KUNS 1464, OU-TAP 68 | gr-qc | null | We analytically study gravitational radiation from corotating binary neutron
stars composed of incompressible, homogeneous fluid in circular orbits. The
energy and the angular momentum loss rates are derived up to the first
post-Newtonian (1PN) order beyond the quadrupole approximation including
effects of the finite... | [
{
"created": "Thu, 2 Jul 1998 12:53:04 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Taniguchi",
"Keisuke",
""
],
[
"Shibata",
"Masaru",
""
]
] | We analytically study gravitational radiation from corotating binary neutron stars composed of incompressible, homogeneous fluid in circular orbits. The energy and the angular momentum loss rates are derived up to the first post-Newtonian (1PN) order beyond the quadrupole approximation including effects of the finite s... |
0708.0675 | Angelo Tartaglia | A. Tartaglia, N. Radicella | Vector field theories in cosmology | 19 pages, 1 figure, to appear on Phys. Rev. D | Phys.Rev.D76:083501,2007 | 10.1103/PhysRevD.76.083501 | null | gr-qc | null | Recently proposed theories based on the cosmic presence of a vectorial field
are compared and contrasted. In particular the so called Einstein aether theory
is discussed in parallel with a recent proposal of a strained space-time theory
(Cosmic Defect theory). We show that the latter fits reasonably well the cosmic
o... | [
{
"created": "Sun, 5 Aug 2007 15:17:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Tartaglia",
"A.",
""
],
[
"Radicella",
"N.",
""
]
] | Recently proposed theories based on the cosmic presence of a vectorial field are compared and contrasted. In particular the so called Einstein aether theory is discussed in parallel with a recent proposal of a strained space-time theory (Cosmic Defect theory). We show that the latter fits reasonably well the cosmic obs... |
2104.15078 | Gerardo Garc\'ia-Moreno | Carlos Barcel\'o, Luis J. Garay, Gerardo Garc\'ia-Moreno | Analogue gravity simulation of superpositions of spacetimes | 13 pages, 2 figures, shortened version that matches the published one | Eur.Phys.J.C 82 (2022) 8, 727 | 10.1140/epjc/s10052-022-10702-5 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Taking the principles of quantum mechanics as they stand and applying them to
gravity, leads to the conclusion that one might be able to generate
superpositions of spacetimes, at least formally. We analyze such a possibility
from an analogue gravity perspective. We present an analogue toy model
consisting of a Bose-E... | [
{
"created": "Fri, 30 Apr 2021 15:56:55 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2022 14:02:17 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Barceló",
"Carlos",
""
],
[
"Garay",
"Luis J.",
""
],
[
"García-Moreno",
"Gerardo",
""
]
] | Taking the principles of quantum mechanics as they stand and applying them to gravity, leads to the conclusion that one might be able to generate superpositions of spacetimes, at least formally. We analyze such a possibility from an analogue gravity perspective. We present an analogue toy model consisting of a Bose-Ein... |
1808.10505 | Saurya Das | Saurya Das (U. Lethbridge), R. K. Bhaduri (McMaster U.) | Bose-Einstein condensate in cosmology | Invited review written for the special issue of Physics News on the
occasion of 125th. birthday anniversary of S. N. Bose. 8 pages, 2 figures.
References added. Explanation about the BEC potential, wavefunction, and
equality of dark matter and dark energy added | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Applying the seminal work of Bose in 1924 on what was later known as
Bose-Einstein statistics, Einstein predicted in 1925 that at sufficiently low
temperatures, a macroscopic fraction of constituents of a gas of bosons will
drop down to the lowest available energy state, forming a `giant molecule' or a
Bose-Einstein ... | [
{
"created": "Thu, 30 Aug 2018 20:21:41 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Sep 2018 01:11:04 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Oct 2018 20:26:26 GMT",
"version": "v3"
}
] | 2018-11-01 | [
[
"Das",
"Saurya",
"",
"U. Lethbridge"
],
[
"Bhaduri",
"R. K.",
"",
"McMaster U."
]
] | Applying the seminal work of Bose in 1924 on what was later known as Bose-Einstein statistics, Einstein predicted in 1925 that at sufficiently low temperatures, a macroscopic fraction of constituents of a gas of bosons will drop down to the lowest available energy state, forming a `giant molecule' or a Bose-Einstein co... |
0903.1580 | Gary Gibbons | G.W. Gibbons | Birkhoff's invariant and Thorne's Hoop Conjecture | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | I propose a sharp form of Thorne's hoop conjecture which relates Birkhoff's
invariant $\beta$ for an outermost apparent horizon to its $ADM$ mass, $ \beta
\le 4 \pi M_{ADM}$. I prove the conjecture in the case of collapsing null
shells and provide further evidence from exact rotating black hole solutions.
Since $\bet... | [
{
"created": "Mon, 9 Mar 2009 15:40:05 GMT",
"version": "v1"
}
] | 2009-03-10 | [
[
"Gibbons",
"G. W.",
""
]
] | I propose a sharp form of Thorne's hoop conjecture which relates Birkhoff's invariant $\beta$ for an outermost apparent horizon to its $ADM$ mass, $ \beta \le 4 \pi M_{ADM}$. I prove the conjecture in the case of collapsing null shells and provide further evidence from exact rotating black hole solutions. Since $\beta$... |
2402.06780 | Omar Nemoul | Omar Nemoul, Hichem Guergouri and Jamal Mimouni | Non-Radial Free Geodesics. I. In Spatially Flat FLRW Spacetime | 39 pages, 11 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper provides an analytical examination of non-radial geodesics within
the context of the spatially flat Friedmann Lema\^itre Robertson Walker (FLRW)
spacetime. Using the symmetry properties of the system, two constants of motion
related to this dynamical system are derived. This treatment enables us to
explici... | [
{
"created": "Fri, 9 Feb 2024 20:55:50 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Nemoul",
"Omar",
""
],
[
"Guergouri",
"Hichem",
""
],
[
"Mimouni",
"Jamal",
""
]
] | This paper provides an analytical examination of non-radial geodesics within the context of the spatially flat Friedmann Lema\^itre Robertson Walker (FLRW) spacetime. Using the symmetry properties of the system, two constants of motion related to this dynamical system are derived. This treatment enables us to explicitl... |
1009.2704 | Milovan Vasili\'c | Milovan Vasilic | String background fields and Riemann-Cartan geometry | 15 pages, JHEP style | Class.Quant.Grav.28:075008,2011 | 10.1088/0264-9381/28/7/075008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study classical dynamics of cylindrical membranes wrapped around the extra
compact dimension of a $(D+1)$-dimensional Riemann-Cartan spacetime. The
world-sheet equations and boundary conditions are obtained from the universally
valid conservation equations of the stress-energy and spin tensors.
Specifically, we co... | [
{
"created": "Tue, 14 Sep 2010 15:49:22 GMT",
"version": "v1"
}
] | 2011-03-10 | [
[
"Vasilic",
"Milovan",
""
]
] | We study classical dynamics of cylindrical membranes wrapped around the extra compact dimension of a $(D+1)$-dimensional Riemann-Cartan spacetime. The world-sheet equations and boundary conditions are obtained from the universally valid conservation equations of the stress-energy and spin tensors. Specifically, we cons... |
0801.3859 | David Hobill | Jop Briet and David Hobill | Determining the Dimensionality of Spacetime by Gravitational Lensing | 9 pages, 3 figures, processed using revtex4 | null | null | null | gr-qc | null | The physics associated with spherically symmetric charged black holes is
analyzed from the point of view of using weak gravitational lensing as a means
for determining the dimensionality of spacetime. In particular, for exact
solutions of electro-vac black holes in four and five spacetime dimensions the
motion of pho... | [
{
"created": "Thu, 24 Jan 2008 23:32:45 GMT",
"version": "v1"
}
] | 2008-01-28 | [
[
"Briet",
"Jop",
""
],
[
"Hobill",
"David",
""
]
] | The physics associated with spherically symmetric charged black holes is analyzed from the point of view of using weak gravitational lensing as a means for determining the dimensionality of spacetime. In particular, for exact solutions of electro-vac black holes in four and five spacetime dimensions the motion of photo... |
1803.08531 | Ezequiel Alvarez | Ezequiel Alvarez | Exercise: Dark Matter as fields that evolve backward in time | Presented in workshop Voyages Beyond the SM II, Feb22-Mar2 (2018) | null | null | ICAS 032/18 | gr-qc hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We do the exercise of thinking the qualitative features of a new model in
which the problems of Dark Matter (DM) and the Cosmic Microwave Background
(CMB) homogeneity are apparently simultaneously solved. We consider that DM
consists of fields that evolve backward in time and have a positive defined
energy to provide... | [
{
"created": "Thu, 22 Mar 2018 18:20:59 GMT",
"version": "v1"
}
] | 2018-03-26 | [
[
"Alvarez",
"Ezequiel",
""
]
] | We do the exercise of thinking the qualitative features of a new model in which the problems of Dark Matter (DM) and the Cosmic Microwave Background (CMB) homogeneity are apparently simultaneously solved. We consider that DM consists of fields that evolve backward in time and have a positive defined energy to provide t... |
1804.09434 | Cosimo Bambi | Carlos A. Benavides-Gallego, A. A. Abdujabbarov, Cosimo Bambi | Gravitational lensing for a boosted Kerr black hole in the presence of
plasma | 20 pages, 17 figures. v2: refereed version | Eur. Phys. J. C (2018) 78:694 | 10.1140/epjc/s10052-018-6170-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the deflection angle for a boosted Kerr black hole in the weak
field approximation. We also study the behavior of light in the presence of
plasma by considering different distributions: singular isothermal sphere,
non-singular isothermal gas sphere, and plasma in a galaxy cluster. We find
that the dragging ... | [
{
"created": "Wed, 25 Apr 2018 09:05:44 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2018 05:59:51 GMT",
"version": "v2"
}
] | 2018-09-03 | [
[
"Benavides-Gallego",
"Carlos A.",
""
],
[
"Abdujabbarov",
"A. A.",
""
],
[
"Bambi",
"Cosimo",
""
]
] | We obtain the deflection angle for a boosted Kerr black hole in the weak field approximation. We also study the behavior of light in the presence of plasma by considering different distributions: singular isothermal sphere, non-singular isothermal gas sphere, and plasma in a galaxy cluster. We find that the dragging of... |
1204.6110 | Delsate T\'erence | Yves Brihaye and T\'erence Delsate | Excited DeSitter brane worlds localized by a kink | 11 pages, 7 figures | null | 10.1103/PhysRevD.86.024029 | null | gr-qc nlin.PS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider, in five-dimensional space-time, the issue of thick brane
localized in the extra dimension by a kink formed by a scalar field. The
localization is achieved by a sine-Gordon potential. Apart from a fundamental
brane (discovered by Koley and Kar \cite{koley_kar}) where the scalar field is
a monotonic func... | [
{
"created": "Fri, 27 Apr 2012 05:44:17 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Brihaye",
"Yves",
""
],
[
"Delsate",
"Térence",
""
]
] | We reconsider, in five-dimensional space-time, the issue of thick brane localized in the extra dimension by a kink formed by a scalar field. The localization is achieved by a sine-Gordon potential. Apart from a fundamental brane (discovered by Koley and Kar \cite{koley_kar}) where the scalar field is a monotonic functi... |
2003.10516 | Israel Quiros | Israel Quiros, Ricardo Garc\'ia-Salcedo, Tame Gonzalez, Jorge Luis
Morales Mart\'inez, Ulises Nucamendi | Global asymptotic dynamics of Cosmological Einsteinian Cubic Gravity | 9 pages, 3 figures. A figure and several bibliographic references
added. Acknowledgments modified | Phys. Rev. D 102, 044018 (2020) | 10.1103/PhysRevD.102.044018 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the cosmological dynamics of an up to cubic
curvature correction to General Relativity (GR) known as Cosmological
Einsteinian Cubic Gravity (CECG), whose vacuum spectrum consists of the
graviton exclusively and its cosmology is well-posed as an initial value
problem. We are able to uncove... | [
{
"created": "Mon, 23 Mar 2020 19:55:30 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Mar 2020 19:59:51 GMT",
"version": "v2"
}
] | 2020-08-12 | [
[
"Quiros",
"Israel",
""
],
[
"García-Salcedo",
"Ricardo",
""
],
[
"Gonzalez",
"Tame",
""
],
[
"Martínez",
"Jorge Luis Morales",
""
],
[
"Nucamendi",
"Ulises",
""
]
] | In this paper we investigate the cosmological dynamics of an up to cubic curvature correction to General Relativity (GR) known as Cosmological Einsteinian Cubic Gravity (CECG), whose vacuum spectrum consists of the graviton exclusively and its cosmology is well-posed as an initial value problem. We are able to uncover ... |
2105.11615 | Adam D. Helfer | Adam D. Helfer | Fluxes and angular momentum | 16 pages, appeared in PRD | Phys. Rev. D 102 (2020) 124036 | 10.1103/PhysRevD.102.124036 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The Ashtekar-Streubel fluxes give a proposed definition of the angular
momentum emitted by an isolated gravitationally radiating system. This was
based on identifying a "phase space of radiative modes," independent of any
internal degrees of freedom, and using the Hamiltonian functions conjugate to
the action of the ... | [
{
"created": "Tue, 25 May 2021 02:24:48 GMT",
"version": "v1"
}
] | 2021-05-26 | [
[
"Helfer",
"Adam D.",
""
]
] | The Ashtekar-Streubel fluxes give a proposed definition of the angular momentum emitted by an isolated gravitationally radiating system. This was based on identifying a "phase space of radiative modes," independent of any internal degrees of freedom, and using the Hamiltonian functions conjugate to the action of the Bo... |
1103.4743 | Steinar Johannesen | Oyvind Gron and Steinar Johannesen | FRW Universe Models in Conformally Flat Spacetime Coordinates. I:
General Formalism | 12 pages | Eur.Phys.J.Plus.126:28,2011 | 10.1140/epjp/i2011-11028-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 3-space of a universe model is defined at a certain simultaneity. Hence
space depends on which time is used. We find a general formula generating all
known and also some new transformations to conformally flat spacetime
coordinates. A general formula for the recession velocity is deduced.
| [
{
"created": "Thu, 24 Mar 2011 12:16:48 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Gron",
"Oyvind",
""
],
[
"Johannesen",
"Steinar",
""
]
] | The 3-space of a universe model is defined at a certain simultaneity. Hence space depends on which time is used. We find a general formula generating all known and also some new transformations to conformally flat spacetime coordinates. A general formula for the recession velocity is deduced. |
1602.07993 | Joao Magueijo | Stephon Alexander, John D. Barrow and Joao Magueijo | Turning on gravity with the Higgs mechanism | Version which appeared in Classical and Quantum Gravity | Class. Quantum Grav. 33, 14LT01 (2016) | 10.1088/0264-9381/33/14/14LT01 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate how a Higgs mechanism could be responsible for the emergence
of gravity in extensions of Einstein theory. In this scenario, at high
energies, symmetry restoration could "turn off" gravity, with dramatic
implications for cosmology and quantum gravity. The sense in which gravity is
muted depends on the d... | [
{
"created": "Thu, 25 Feb 2016 16:48:09 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 2017 15:46:43 GMT",
"version": "v2"
}
] | 2017-07-03 | [
[
"Alexander",
"Stephon",
""
],
[
"Barrow",
"John D.",
""
],
[
"Magueijo",
"Joao",
""
]
] | We investigate how a Higgs mechanism could be responsible for the emergence of gravity in extensions of Einstein theory. In this scenario, at high energies, symmetry restoration could "turn off" gravity, with dramatic implications for cosmology and quantum gravity. The sense in which gravity is muted depends on the det... |
1603.05535 | Maye Elmardi Ms | Maye Elmardi, Amare Abebe and Abiy Tekola | Chaplygin-gas Solutions of f(R) Gravity | 11 pages, no figures; more discussions and references added. Accepted
in Int. J. of Geometric Methods in Modern Physics (IJGMMP) | Int. J. Geom. Methods Mod. Phys. Vol. 13, No. 10 (2016) 1650120 | 10.1142/S0219887816501206 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore exact f(R) gravity solutions that mimic Chaplygin-gas inspired
LCDM cosmology. Starting with the original and modified Chaplygin gas equations
of state, we reconstruct the forms of f(R) Lagrangians. The resulting solutions
are generally quadratic in the Ricci scalar, but have appropriate LCDM
solutions in ... | [
{
"created": "Thu, 17 Mar 2016 15:19:05 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2016 18:16:43 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Jun 2016 17:25:28 GMT",
"version": "v3"
},
{
"created": "Wed, 23 Nov 2016 00:16:38 GMT",
"version": "v4"
}
] | 2016-11-24 | [
[
"Elmardi",
"Maye",
""
],
[
"Abebe",
"Amare",
""
],
[
"Tekola",
"Abiy",
""
]
] | We explore exact f(R) gravity solutions that mimic Chaplygin-gas inspired LCDM cosmology. Starting with the original and modified Chaplygin gas equations of state, we reconstruct the forms of f(R) Lagrangians. The resulting solutions are generally quadratic in the Ricci scalar, but have appropriate LCDM solutions in li... |
2308.10773 | Patrik \v{S}van\v{c}ara | Patrik \v{S}van\v{c}ara, Pietro Smaniotto, Leonardo Solidoro, James F.
MacDonald, Sam Patrick, Ruth Gregory, Carlo F. Barenghi, Silke Weinfurtner | Rotating Curved Spacetime Signatures from a Giant Quantum Vortex | 9 pages, 6 figures | null | 10.1038/s41586-024-07176-8 | null | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravity simulators are laboratory systems where small excitations like sound
or surface waves behave as fields propagating on a curved spacetime geometry.
The analogy between gravity and fluids requires vanishing viscosity, a feature
naturally realised in superfluids like liquid helium or cold atomic clouds.
Such sys... | [
{
"created": "Mon, 21 Aug 2023 15:04:29 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2023 09:14:30 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Nov 2023 18:35:09 GMT",
"version": "v3"
},
{
"created": "Tue, 23 Jan 2024 20:28:25 GMT",
"version": "v4"
}
] | 2024-03-26 | [
[
"Švančara",
"Patrik",
""
],
[
"Smaniotto",
"Pietro",
""
],
[
"Solidoro",
"Leonardo",
""
],
[
"MacDonald",
"James F.",
""
],
[
"Patrick",
"Sam",
""
],
[
"Gregory",
"Ruth",
""
],
[
"Barenghi",
"Carlo F.",
""
... | Gravity simulators are laboratory systems where small excitations like sound or surface waves behave as fields propagating on a curved spacetime geometry. The analogy between gravity and fluids requires vanishing viscosity, a feature naturally realised in superfluids like liquid helium or cold atomic clouds. Such syste... |
0706.0451 | Amir H. Abbassi | Amir H. Abbassi and Amir M. Abbassi | Density-metric unimodular gravity:vacuum spherical symmetry | 15 pages,no,figures,typos corrected,new section added,published
version | Class.Quant.Grav.25:175018,2008 | 10.1088/0264-9381/25/17/175018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze an alternative theory of gravity characterized by metrics that are
tensor density of rank(0,2)and weight-1/2.The metric compatibility condition is
supposed to hold. The simplest expression for the action of gravitational field
is used.Taking the metric and trace of connections as dynamical variables,the
fi... | [
{
"created": "Mon, 4 Jun 2007 15:14:21 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jan 2008 07:11:25 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Aug 2008 05:28:54 GMT",
"version": "v3"
}
] | 2008-12-18 | [
[
"Abbassi",
"Amir H.",
""
],
[
"Abbassi",
"Amir M.",
""
]
] | We analyze an alternative theory of gravity characterized by metrics that are tensor density of rank(0,2)and weight-1/2.The metric compatibility condition is supposed to hold. The simplest expression for the action of gravitational field is used.Taking the metric and trace of connections as dynamical variables,the fiel... |
1109.0771 | Leandro Belo | Leandro R. A. Belo, Ednardo P. Spaniol, Juliano A. de Deus and Vanessa
C. de Andrade | Kinematics of the internal space associated with the TEGR | 12 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of Teleparallel Equivalent of General Relativity - TEGR - we
have obtained, through the second kind gauge transformations, the most
fundamental transformations, namely, the first kind ones. We show that
considering the possibility of decomposing the components of the tetrad field
as a trivial part plus... | [
{
"created": "Mon, 5 Sep 2011 00:28:36 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Sep 2012 00:31:10 GMT",
"version": "v2"
}
] | 2012-10-02 | [
[
"Belo",
"Leandro R. A.",
""
],
[
"Spaniol",
"Ednardo P.",
""
],
[
"de Deus",
"Juliano A.",
""
],
[
"de Andrade",
"Vanessa C.",
""
]
] | In the context of Teleparallel Equivalent of General Relativity - TEGR - we have obtained, through the second kind gauge transformations, the most fundamental transformations, namely, the first kind ones. We show that considering the possibility of decomposing the components of the tetrad field as a trivial part plus s... |
2106.11325 | Andrea Maselli | Andrea Maselli, Nicola Franchini, Leonardo Gualtieri, Thomas P.
Sotiriou, Susanna Barsanti, Paolo Pani | Detecting fundamental fields with LISA observations of gravitational
waves from extreme mass-ratio inspirals | Typo corrected to match the version in press | Nat Astron (2022) | 10.1038/s41550-021-01589-5 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Laser Interferometer Space Antenna, LISA, will detect gravitational wave
signals from Extreme Mass Ratio Inspirals, where a stellar mass compact object
orbits a supermassive black hole and eventually plunges into it. Here we report
on LISA's capability to detect whether the smaller compact object in an Extreme
Ma... | [
{
"created": "Mon, 21 Jun 2021 18:00:04 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jan 2022 12:34:27 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Feb 2022 09:15:06 GMT",
"version": "v3"
}
] | 2022-03-16 | [
[
"Maselli",
"Andrea",
""
],
[
"Franchini",
"Nicola",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Sotiriou",
"Thomas P.",
""
],
[
"Barsanti",
"Susanna",
""
],
[
"Pani",
"Paolo",
""
]
] | The Laser Interferometer Space Antenna, LISA, will detect gravitational wave signals from Extreme Mass Ratio Inspirals, where a stellar mass compact object orbits a supermassive black hole and eventually plunges into it. Here we report on LISA's capability to detect whether the smaller compact object in an Extreme Mass... |
2405.17165 | Damianos Iosifidis | Esmaeil Peyghan, Leila Nourmohammadifar and Damianos Iosifidis | Statistical conformal Killing Vector Fields for FLRW Space-Time | 30 pages, Published in Physica Scripta | null | null | null | gr-qc math-ph math.DG math.MP | http://creativecommons.org/licenses/by/4.0/ | The classification of conformal Killing vector fields for FLRW space-time
from Riemannian point of view was done by Maartens-Maharaj in
\cite{Maartens1986}. In this paper, we introduce conformal Killing vector
fields from a new point of view for the FLRW space-time. In particular, we
consider three cases for the conf... | [
{
"created": "Mon, 27 May 2024 13:39:57 GMT",
"version": "v1"
}
] | 2024-05-28 | [
[
"Peyghan",
"Esmaeil",
""
],
[
"Nourmohammadifar",
"Leila",
""
],
[
"Iosifidis",
"Damianos",
""
]
] | The classification of conformal Killing vector fields for FLRW space-time from Riemannian point of view was done by Maartens-Maharaj in \cite{Maartens1986}. In this paper, we introduce conformal Killing vector fields from a new point of view for the FLRW space-time. In particular, we consider three cases for the confor... |
1911.13103 | Olivier Sarbach | Francesco Cremona, Livio Pizzocchero, Olivier Sarbach | Gauge-invariant spherical linear perturbations of wormholes in Einstein
gravity minimally coupled to a self-interacting phantom scalar field | 30 pages, 1 figure, new section discussing a wormhole with de
Sitter-type ends. To appear in Physical Review D | null | 10.1103/PhysRevD.101.104061 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, there has been quite a lot of interest in static, spherical
wormhole spacetimes and the question of their stability with respect to
time-dependent perturbations. The consideration of linearized perturbations
usually leads to a master wave equation with effective potential which can then
be analyzed using st... | [
{
"created": "Fri, 29 Nov 2019 13:30:13 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2020 03:20:35 GMT",
"version": "v2"
}
] | 2020-06-10 | [
[
"Cremona",
"Francesco",
""
],
[
"Pizzocchero",
"Livio",
""
],
[
"Sarbach",
"Olivier",
""
]
] | Recently, there has been quite a lot of interest in static, spherical wormhole spacetimes and the question of their stability with respect to time-dependent perturbations. The consideration of linearized perturbations usually leads to a master wave equation with effective potential which can then be analyzed using stan... |
2204.08445 | Arnab Dhani | Arnab Dhani, Anuradha Gupta, B. S. Sathyaprakash | Constraining runaway dilaton models using joint gravitational-wave and
electromagnetic observations | null | null | 10.1103/PhysRevD.106.064032 | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | With the advent of gravitational-wave astronomy it has now been possible to
constrain modified theories of gravity that were invoked to explain the dark
energy. In a class of dilaton models, distances to cosmic sources inferred from
electromagnetic and gravitational wave observations would differ due to the
presence ... | [
{
"created": "Mon, 18 Apr 2022 17:55:58 GMT",
"version": "v1"
}
] | 2022-10-05 | [
[
"Dhani",
"Arnab",
""
],
[
"Gupta",
"Anuradha",
""
],
[
"Sathyaprakash",
"B. S.",
""
]
] | With the advent of gravitational-wave astronomy it has now been possible to constrain modified theories of gravity that were invoked to explain the dark energy. In a class of dilaton models, distances to cosmic sources inferred from electromagnetic and gravitational wave observations would differ due to the presence of... |
gr-qc/0102040 | null | Andrzej Krasinski (N. Copernicus Astronomical Center and College of
Science, Polish Academy of Sciences, Warszawa, Poland) | Friedmann limits of rotating hypersurface-homogeneous dust models | 39 pages, LaTeX, 1 postscript figure. Subjects: General relativity,
exact solutions, cosmology | J.Math.Phys. 42 (2001) 3628-3664 | 10.1063/1.1378304 | null | gr-qc | null | The existence of Friedmann limits is systematically investigated for all the
hypersurface-homogeneous rotating dust models, presented in previous papers by
this author. Limiting transitions that involve a change of the Bianchi type are
included. Except for stationary models that obviously do not allow it, the
Friedma... | [
{
"created": "Fri, 9 Feb 2001 16:15:32 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Krasinski",
"Andrzej",
"",
"N. Copernicus Astronomical Center and College of\n Science, Polish Academy of Sciences, Warszawa, Poland"
]
] | The existence of Friedmann limits is systematically investigated for all the hypersurface-homogeneous rotating dust models, presented in previous papers by this author. Limiting transitions that involve a change of the Bianchi type are included. Except for stationary models that obviously do not allow it, the Friedmann... |
1610.03655 | Jakub Mielczarek Ph.D. | Joanna Luc, Jakub Mielczarek | Slow-roll approximation in loop quantum cosmology | 16 pages, 1 figure | null | 10.1088/1475-7516/2017/01/045 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The slow-roll approximation is an analytical approach to study dynamical
properties of the inflationary universe. In this article, systematic
construction of the slow-roll expansion for effective loop quantum cosmology is
presented. The analysis is performed up to the fourth order in both slow-roll
parameters and the... | [
{
"created": "Wed, 12 Oct 2016 09:55:44 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Luc",
"Joanna",
""
],
[
"Mielczarek",
"Jakub",
""
]
] | The slow-roll approximation is an analytical approach to study dynamical properties of the inflationary universe. In this article, systematic construction of the slow-roll expansion for effective loop quantum cosmology is presented. The analysis is performed up to the fourth order in both slow-roll parameters and the p... |
gr-qc/9610007 | Maria Guimaraes | Maria Em\'ilia X. Guimar\~aes | Cosmic String in Scalar-Tensor Gravities | 16 pages, Latex, no figures | Class.Quant.Grav. 14 (1997) 435-442 | 10.1088/0264-9381/14/2/016 | null | gr-qc | null | We consider a local cosmic string described by the Abelian-Higgs model in the
framework of scalar-tensor gravities. We find the metric of the cosmic string
in the weak-field approximation. The propagation of particles and light is
analysed in this background. This analysis shows that the (unperturbed) cosmic
string i... | [
{
"created": "Fri, 4 Oct 1996 12:54:59 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Guimarães",
"Maria Emília X.",
""
]
] | We consider a local cosmic string described by the Abelian-Higgs model in the framework of scalar-tensor gravities. We find the metric of the cosmic string in the weak-field approximation. The propagation of particles and light is analysed in this background. This analysis shows that the (unperturbed) cosmic string in ... |
2206.06480 | Andrius Tamosiunas | Andrius Tamosiunas, Chad Briddon, Clare Burrage, Alan Cutforth, Adam
Moss, Thomas Vincent | Chameleon Screening in Cosmic Voids | 19 pages, 9 figures. The SELCIE code is available at:
https://github.com/C-Briddon/SELCIE. Submitted to JCAP | JCAP11 (2022) 056 | 10.1088/1475-7516/2022/11/056 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | A key goal in cosmology in the upcoming decade will be to form a better
understanding of the accelerated expansion of the Universe. Upcoming surveys,
such as the Vera C. Rubin Observatory's 10-year Legacy Survey of Space and Time
(LSST), Euclid and the Square Killometer Array (SKA) will deliver key datasets
required ... | [
{
"created": "Mon, 13 Jun 2022 21:27:07 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jul 2022 14:02:30 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Nov 2022 17:57:55 GMT",
"version": "v3"
}
] | 2022-11-29 | [
[
"Tamosiunas",
"Andrius",
""
],
[
"Briddon",
"Chad",
""
],
[
"Burrage",
"Clare",
""
],
[
"Cutforth",
"Alan",
""
],
[
"Moss",
"Adam",
""
],
[
"Vincent",
"Thomas",
""
]
] | A key goal in cosmology in the upcoming decade will be to form a better understanding of the accelerated expansion of the Universe. Upcoming surveys, such as the Vera C. Rubin Observatory's 10-year Legacy Survey of Space and Time (LSST), Euclid and the Square Killometer Array (SKA) will deliver key datasets required to... |
1603.04149 | Chengyuan Zhang | Cheng-Yuan Zhang, Ya-Bo Wu, Yong-Yi Jin, Yun-Tian Chai, Mu-Hong Hu,
Zhuo Zhang | Lifshitz scaling effects on holographic paramagnetism/ferromagneism
phase transition | 28 pages,17 figures. arXiv admin note: substantial text overlap with
arXiv:1507.00546; text overlap with arXiv:1404.7737, arXiv:1601.02936 by
other authors | Phys. Rev. D 93, 126001 (2016) | 10.1103/PhysRevD.93.126001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the probe limit, we investigate holographic paramagnetism-ferromagnetism
phase transition in the four-dimensional (4D) and five-dimensional(5D) Lifshitz
black holes by means of numerical and semi-analytical methods, which is
realized by introducing a massive 2-form field coupled to the Maxwell field. We
find that ... | [
{
"created": "Mon, 14 Mar 2016 06:53:15 GMT",
"version": "v1"
}
] | 2016-06-15 | [
[
"Zhang",
"Cheng-Yuan",
""
],
[
"Wu",
"Ya-Bo",
""
],
[
"Jin",
"Yong-Yi",
""
],
[
"Chai",
"Yun-Tian",
""
],
[
"Hu",
"Mu-Hong",
""
],
[
"Zhang",
"Zhuo",
""
]
] | In the probe limit, we investigate holographic paramagnetism-ferromagnetism phase transition in the four-dimensional (4D) and five-dimensional(5D) Lifshitz black holes by means of numerical and semi-analytical methods, which is realized by introducing a massive 2-form field coupled to the Maxwell field. We find that th... |
1002.3914 | Gonzalo Olmo | I. Agullo, J. Navarro-Salas, Gonzalo J. Olmo, and Leonard Parker | Inflation, Renormalization, and CMB Anisotropies | 4 pages, jpconf.cls, to appear in the Proceedings of Spanish
Relativity Meeting 2009 (ERE 09), Bilbao (Spain) | J.Phys.Conf.Ser.229:012058,2010 | 10.1088/1742-6596/229/1/012058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In single-field, slow-roll inflationary models, scalar and tensorial
(Gaussian) perturbations are both characterized by a zero mean and a non-zero
variance. In position space, the corresponding variance of those fields
diverges in the ultraviolet. The requirement of a finite variance in position
space forces its regu... | [
{
"created": "Sat, 20 Feb 2010 17:11:38 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Agullo",
"I.",
""
],
[
"Navarro-Salas",
"J.",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Parker",
"Leonard",
""
]
] | In single-field, slow-roll inflationary models, scalar and tensorial (Gaussian) perturbations are both characterized by a zero mean and a non-zero variance. In position space, the corresponding variance of those fields diverges in the ultraviolet. The requirement of a finite variance in position space forces its regula... |
2010.02775 | Nikolaos Dimakis | Genly Leon, Andronikos Paliathanasis and N. Dimakis | Exact Kantowski-Sachs spacetimes in Einstein-Aether Scalar field theory | 18 pages, 2 figures, Latex2e source file, accepted in EPJC version | null | 10.1140/epjc/s10052-020-08721-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact and analytic solutions in Einstein-Aether scalar field theory with
Kantowski-Sachs background space are determined. The theory of point symmetries
is applied to determine the functional form of the unknown functions which
defines the gravitational model. Conservation laws are applied to reduce the
order of the ... | [
{
"created": "Tue, 6 Oct 2020 14:46:53 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 2020 10:45:09 GMT",
"version": "v2"
}
] | 2020-12-30 | [
[
"Leon",
"Genly",
""
],
[
"Paliathanasis",
"Andronikos",
""
],
[
"Dimakis",
"N.",
""
]
] | Exact and analytic solutions in Einstein-Aether scalar field theory with Kantowski-Sachs background space are determined. The theory of point symmetries is applied to determine the functional form of the unknown functions which defines the gravitational model. Conservation laws are applied to reduce the order of the fi... |
1810.11321 | Pablo Anglada | Pablo Anglada | Comments on Penrose inequality with angular momentum for outermost
apparent horizons | arXiv admin note: text overlap with arXiv:1708.04646 | null | 10.1088/1361-6382/ab51c1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent work we have proved a weaker version of the Penrose inequality
with angular momentum, in axially symmetric space-times, for a compact and
connected minimal surface. In this previous work we use the monotonicity of
Geroch energy on 2-surfaces along the inverse mean curvature flow and we obtain
a lower boun... | [
{
"created": "Wed, 24 Oct 2018 19:19:23 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Feb 2020 14:39:17 GMT",
"version": "v2"
}
] | 2020-02-24 | [
[
"Anglada",
"Pablo",
""
]
] | In a recent work we have proved a weaker version of the Penrose inequality with angular momentum, in axially symmetric space-times, for a compact and connected minimal surface. In this previous work we use the monotonicity of Geroch energy on 2-surfaces along the inverse mean curvature flow and we obtain a lower bound ... |
gr-qc/0304021 | Muhammed Sharif | M. Sharif | Momentum Imparted by Gravitational Waves | 8 pages, no figure, Latex | Nuovo Cim.B118:595-603,2003; Erratum-ibid.118B:745,2003 | 10.1393/ncb/i2003-10005-8 | null | gr-qc | null | We calculate momentum imparted by colliding gravitational waves in a closed
Friedmann Robertson-Walker background and also by gravitational waves with
toroidal wavefronts using an operational procedure. The results obtained for
toroidal wavefronts are well behaved and reduce to the spherical wavefronts for
a special ... | [
{
"created": "Fri, 4 Apr 2003 09:07:52 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Sharif",
"M.",
""
]
] | We calculate momentum imparted by colliding gravitational waves in a closed Friedmann Robertson-Walker background and also by gravitational waves with toroidal wavefronts using an operational procedure. The results obtained for toroidal wavefronts are well behaved and reduce to the spherical wavefronts for a special ch... |
gr-qc/9409017 | null | Lajos Diosi | Critique of weakly decohering and linearly positive histories | 5 pages LaTeX | null | null | null | gr-qc | null | The usual composition rule of independent systems, as applied to decoherent
histories or to linearly positive histories, requires (at least) medium
decoherence and, consequently, a second constraint for the linearly positive
histories of Goldstein and Page. Other plausible classical features, valid for
medium decoher... | [
{
"created": "Fri, 9 Sep 1994 13:58:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Diosi",
"Lajos",
""
]
] | The usual composition rule of independent systems, as applied to decoherent histories or to linearly positive histories, requires (at least) medium decoherence and, consequently, a second constraint for the linearly positive histories of Goldstein and Page. Other plausible classical features, valid for medium decoheren... |
gr-qc/9803098 | Edward Teo | Edward Teo | Rotating traversable wormholes | 15 pages, harvmac; 1 figure in PicTeX; minor changes; to appear in
Phys. Rev. D | Phys.Rev.D58:024014,1998 | 10.1103/PhysRevD.58.024014 | DAMTP R98/17 | gr-qc | null | The general form of a stationary, axially symmetric traversable wormhole is
discussed. This provides an explicit class of rotating wormholes that
generalize the static, spherically symmetric ones first considered by Morris
and Thorne. In agreement with general analyses, it is verified that such a
wormhole generically... | [
{
"created": "Tue, 31 Mar 1998 13:03:57 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 1998 13:05:21 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Teo",
"Edward",
""
]
] | The general form of a stationary, axially symmetric traversable wormhole is discussed. This provides an explicit class of rotating wormholes that generalize the static, spherically symmetric ones first considered by Morris and Thorne. In agreement with general analyses, it is verified that such a wormhole generically v... |
1708.05900 | Ozgur Delice | Hatice \"Ozer, \"Ozg\"ur Delice | Linearized modified gravity theories with a cosmological term: advance
of perihelion and deflection of light | 25 pages, Revtex. V2: two new sections discussing galactic and
intergalactic phenomena are added, discussion is extended, references added,
Published version, | Class. Quantum Grav. 35 (2018) 065002 | 10.1088/1361-6382/aaa633 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two different ways of generalizing Einstein's general theory of relativity
with a cosmological constant to Brans-Dicke type scalar-tensor theories are
investigated in the linearized field approximation. In the first case a
cosmological constant term is coupled to a scalar field linearly whereas in the
second case an ... | [
{
"created": "Sat, 19 Aug 2017 20:57:07 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2018 13:23:18 GMT",
"version": "v2"
}
] | 2018-02-07 | [
[
"Özer",
"Hatice",
""
],
[
"Delice",
"Özgür",
""
]
] | Two different ways of generalizing Einstein's general theory of relativity with a cosmological constant to Brans-Dicke type scalar-tensor theories are investigated in the linearized field approximation. In the first case a cosmological constant term is coupled to a scalar field linearly whereas in the second case an ar... |
1008.4238 | Philippe G. LeFloch | Nabil Bedjaoui, Philippe G. LeFloch, Jos\'e M. Mart\'in-Garc\'ia, and
J\'er\^ome Novak | Existence of naked singularities in Brans-Dicke theory of gravitation.
An analytical and numerical study | 26 pages, PACS numbers: 04.20.Dw, 04.25.dc, 04.50.Kd | Class.Quant.Grav.27:245010,2010 | 10.1088/0264-9381/27/24/245010 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of the scalar-tensor models of gravitation and by
relying on analytical and numerical techniques, we establish the existence of a
class of spherically symmetric spacetimes containing a naked singularity. Our
result relies on and extends a work by Christodoulou on the existence of naked
singularit... | [
{
"created": "Wed, 25 Aug 2010 09:38:49 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Nov 2010 10:12:14 GMT",
"version": "v2"
},
{
"created": "Sat, 20 Nov 2010 11:46:45 GMT",
"version": "v3"
}
] | 2010-11-30 | [
[
"Bedjaoui",
"Nabil",
""
],
[
"LeFloch",
"Philippe G.",
""
],
[
"Martín-García",
"José M.",
""
],
[
"Novak",
"Jérôme",
""
]
] | Within the framework of the scalar-tensor models of gravitation and by relying on analytical and numerical techniques, we establish the existence of a class of spherically symmetric spacetimes containing a naked singularity. Our result relies on and extends a work by Christodoulou on the existence of naked singularitie... |
gr-qc/9501020 | Peter Peldan | Peter Peldan (Penn State University) | Large Diffeomorphisms in (2+1)-Quantum Gravity on the Torus | The proof for the nonexistence of the one- and two-dimensional
representations of PSL(2,Z) in the relevant Hilbert space, has been extended
to cover all finite dimensional unitary representations. The notation is
slightly improved and a few references are added. | Phys.Rev.D53:3147-3155,1996 | 10.1103/PhysRevD.53.3147 | CGPG-95/1-1 | gr-qc hep-th | null | The issue of how to deal with the modular transformations -- large
diffeomorphisms -- in (2+1)-quantum gravity on the torus is discussed. I study
the Chern-Simons/connection representation and show that the behavior of the
modular transformations on the reduced configuration space is so bad that it is
possible to rul... | [
{
"created": "Wed, 18 Jan 1995 16:43:28 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Mar 1995 20:26:03 GMT",
"version": "v2"
}
] | 2011-09-09 | [
[
"Peldan",
"Peter",
"",
"Penn State University"
]
] | The issue of how to deal with the modular transformations -- large diffeomorphisms -- in (2+1)-quantum gravity on the torus is discussed. I study the Chern-Simons/connection representation and show that the behavior of the modular transformations on the reduced configuration space is so bad that it is possible to rule ... |
1202.5347 | William Kelly | William R. Kelly and Donald Marolf | Phase Spaces for asymptotically de Sitter Cosmologies | null | Class.Quant.Grav. 29 (2012) 205013 | 10.1088/0264-9381/29/20/205013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct two types of phase spaces for asymptotically de Sitter
Einstein-Hilbert gravity in each spacetime dimension $d \ge 3$. One type
contains solutions asymptotic to the expanding spatially-flat ($k=0$)
cosmological patch of de Sitter space while the other is asymptotic to the
expanding hyperbolic $(k=-1)$ pa... | [
{
"created": "Thu, 23 Feb 2012 23:59:00 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2012 07:08:32 GMT",
"version": "v2"
}
] | 2013-09-17 | [
[
"Kelly",
"William R.",
""
],
[
"Marolf",
"Donald",
""
]
] | We construct two types of phase spaces for asymptotically de Sitter Einstein-Hilbert gravity in each spacetime dimension $d \ge 3$. One type contains solutions asymptotic to the expanding spatially-flat ($k=0$) cosmological patch of de Sitter space while the other is asymptotic to the expanding hyperbolic $(k=-1)$ patc... |
1804.04060 | Jose Luis Bl\'azquez-Salcedo | Jose Luis Bl\'azquez-Salcedo, Daniela D. Doneva, Jutta Kunz, Kalin V.
Staykov, Stoytcho S. Yazadjiev | Axial quasi-normal modes of neutron stars in $R^2$ gravity | 20 pages, 8 Figures | Phys. Rev. D 98, 104047 (2018) | 10.1103/PhysRevD.98.104047 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper the axial quasi-normal modes of neutron stars in $f(R)$
gravity are examined using a large set of equations of state. The numerical
calculations are made using two different approaches -- performing time
evolution of the perturbation equations and solving the time-independent
representation of th... | [
{
"created": "Wed, 11 Apr 2018 15:54:37 GMT",
"version": "v1"
}
] | 2018-12-05 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Staykov",
"Kalin V.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | In the present paper the axial quasi-normal modes of neutron stars in $f(R)$ gravity are examined using a large set of equations of state. The numerical calculations are made using two different approaches -- performing time evolution of the perturbation equations and solving the time-independent representation of the ... |
gr-qc/0602007 | Pavel Krtous | Pavel Krtous and Jiri Podolsky | Asymptotic structure of radiation in higher dimensions | 14 pages, no figures (two references added) | Class.Quant.Grav. 23 (2006) 1603-1616 | 10.1088/0264-9381/23/5/011 | null | gr-qc hep-th | null | We characterize a general gravitational field near conformal infinity (null,
spacelike, or timelike) in spacetimes of any dimension. This is based on an
explicit evaluation of the dependence of the radiative component of the Weyl
tensor on the null direction from which infinity is approached. The behaviour
similar to... | [
{
"created": "Thu, 2 Feb 2006 10:15:38 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Feb 2006 15:25:51 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Krtous",
"Pavel",
""
],
[
"Podolsky",
"Jiri",
""
]
] | We characterize a general gravitational field near conformal infinity (null, spacelike, or timelike) in spacetimes of any dimension. This is based on an explicit evaluation of the dependence of the radiative component of the Weyl tensor on the null direction from which infinity is approached. The behaviour similar to p... |
gr-qc/0105098 | Luc Blanchet | Luc Blanchet, Bala R. Iyer, Benoit Joguet | Gravitational waves from inspiralling compact binaries: Energy flux to
third post-Newtonian order | 69 pages, version which includes the correction of an Erratum to be
published in Phys. Rev. D (2005) | Phys.Rev.D65:064005,2002; Erratum-ibid.D71:129903,2005 | 10.1103/PhysRevD.65.064005 10.1103/PhysRevD.71.129903 | null | gr-qc | null | The multipolar-post-Minkowskian approach to gravitational radiation is
applied to the problem of the generation of waves by the compact binary
inspiral. We investigate specifically the third post-Newtonian (3PN)
approximation in the total energy flux. The new results are the computation of
the mass quadrupole moment ... | [
{
"created": "Sat, 26 May 2001 10:47:58 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Oct 2001 10:10:11 GMT",
"version": "v2"
},
{
"created": "Fri, 27 May 2005 14:30:39 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Blanchet",
"Luc",
""
],
[
"Iyer",
"Bala R.",
""
],
[
"Joguet",
"Benoit",
""
]
] | The multipolar-post-Minkowskian approach to gravitational radiation is applied to the problem of the generation of waves by the compact binary inspiral. We investigate specifically the third post-Newtonian (3PN) approximation in the total energy flux. The new results are the computation of the mass quadrupole moment of... |
1203.3401 | Kazuharu Bamba | Kazuharu Bamba, Kuralay Yesmakhanova, Koblandy Yerzhanov and Ratbay
Myrzakulov | Reconstruction of the equation of state for the cyclic universes in
homogeneous and isotropic cosmology | 29 pages, 8 figures, version accepted for publication in Central
European Journal of Physics | Central European Journal of Physics, v.11, N4, 397-411 (2013) | 10.2478/s11534-013-0187-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the cosmological evolutions of the equation of state (EoS) for the
universe in the homogeneous and isotropic
Friedmann-Lema\^{i}tre-Robertson-Walker (FLRW) space-time. In particular, we
reconstruct the cyclic universes by using the Weierstrass and Jacobian elliptic
functions. It is explicitly illustrated tha... | [
{
"created": "Thu, 15 Mar 2012 15:59:19 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2012 18:42:24 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Feb 2013 06:56:06 GMT",
"version": "v3"
}
] | 2014-01-14 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Yesmakhanova",
"Kuralay",
""
],
[
"Yerzhanov",
"Koblandy",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | We study the cosmological evolutions of the equation of state (EoS) for the universe in the homogeneous and isotropic Friedmann-Lema\^{i}tre-Robertson-Walker (FLRW) space-time. In particular, we reconstruct the cyclic universes by using the Weierstrass and Jacobian elliptic functions. It is explicitly illustrated that ... |
1207.0716 | Lorenzo Iorio | L. Iorio | A uniform treatment of the orbital effects due to a violation of the
Strong Equivalence Principle in the gravitational Stark-like limit | LaTex2e, 14 pages, no figures, no tables, 42 references. To appear in
Classical and Quantum Gravity (CQG) | Class. Quant. Gravit..30:025006,2013 | 10.1088/0264-9381/30/2/025006 | null | gr-qc astro-ph.EP astro-ph.GA physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically work out several effects which a violation of the Strong
Equivalence Principle (SEP) induces on the orbital motion of a binary system
constituted of self-gravitating bodies immersed in a constant and uniform
external field. We do not restrict to the small eccentricity limit. Moreover,
we do not select... | [
{
"created": "Mon, 2 Jul 2012 14:30:12 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jul 2012 15:26:10 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Nov 2012 15:45:56 GMT",
"version": "v3"
}
] | 2012-12-18 | [
[
"Iorio",
"L.",
""
]
] | We analytically work out several effects which a violation of the Strong Equivalence Principle (SEP) induces on the orbital motion of a binary system constituted of self-gravitating bodies immersed in a constant and uniform external field. We do not restrict to the small eccentricity limit. Moreover, we do not select a... |
1206.1073 | Monica Forte | M\'onica I. Forte and Mart\'in G. Richarte | Holographic dark energy interacting with dark matter | 5 pages, 2 figures. Note: To appear in the book Gravitation,
Relativistic Astrophysics, and Cosmology, by Cambridge University Press, as
part of the proceedings of I GAC, held in Foz de Iguaz\'u, Brazil, 4-8
October of 2011 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a spatially flat Friedmann-Robertson-Walker (FRW) cosmological
model with cold dark matter coupled to a dark energy which is given by the
modified holographic Ricci cutoff. The interaction used is linear in both dark
energy densities, the total energy density and its derivative. Using the
statistical m... | [
{
"created": "Tue, 5 Jun 2012 20:58:34 GMT",
"version": "v1"
}
] | 2012-06-07 | [
[
"Forte",
"Mónica I.",
""
],
[
"Richarte",
"Martín G.",
""
]
] | We investigate a spatially flat Friedmann-Robertson-Walker (FRW) cosmological model with cold dark matter coupled to a dark energy which is given by the modified holographic Ricci cutoff. The interaction used is linear in both dark energy densities, the total energy density and its derivative. Using the statistical met... |
gr-qc/0606006 | M. Meyer | S. Deser | First-order Formalism and Odd-derivative Actions | 4 pages. Dedicated to Rafael Sorkin on his 60th Birthday | Class.Quant.Grav.23:5773,2006 | 10.1088/0264-9381/23/18/N01 | BRX TH-575 | gr-qc | null | In this pedagogical note, we discuss obstacles to the usual Palatini
formulations of gauge and gravity theories in presence of odd-derivative order,
Chern-Simons, terms.
| [
{
"created": "Thu, 1 Jun 2006 19:11:23 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Deser",
"S.",
""
]
] | In this pedagogical note, we discuss obstacles to the usual Palatini formulations of gauge and gravity theories in presence of odd-derivative order, Chern-Simons, terms. |
2210.13251 | Alesandro Santos | J. S. Gon\c{c}alves and A. F. Santos | G\"{o}del-type solutions in $f(R,T,R_{\mu\nu} T^{\mu\nu}$) gravity | 13 pages, accepted for publication in EPJC | null | 10.1140/epjc/s10052-022-10950-5 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, $f(R,T,R_{\mu\nu} T^{\mu\nu}$) gravity is considered. It is a
modified theory of gravity that exhibits a strong coupling of gravitational and
matter fields. Therefore, if gravity is governed by this model a number of
issues must be re-examined. In this context, the question of causality and its
violati... | [
{
"created": "Mon, 24 Oct 2022 13:52:47 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Gonçalves",
"J. S.",
""
],
[
"Santos",
"A. F.",
""
]
] | In this paper, $f(R,T,R_{\mu\nu} T^{\mu\nu}$) gravity is considered. It is a modified theory of gravity that exhibits a strong coupling of gravitational and matter fields. Therefore, if gravity is governed by this model a number of issues must be re-examined. In this context, the question of causality and its violation... |
gr-qc/9910013 | Shinji Mukohyama | Shinji Mukohyama | Is the brick-wall model unstable for a rotating background? | Latex, 17 pages, 1 figure, accepted for publication in Phys. Rev. D | Phys.Rev.D61:124021,2000 | 10.1103/PhysRevD.61.124021 | YITP-99-61 | gr-qc | null | The stability of the brick wall model is analyzed in a rotating background.
It is shown that in the Kerr background without horizon but with an inner
boundary a scalar field has complex-frequency modes and that, however, the
imaginary part of the complex frequency can be small enough compared with the
Hawking tempera... | [
{
"created": "Mon, 4 Oct 1999 22:16:40 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2000 21:29:07 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Mukohyama",
"Shinji",
""
]
] | The stability of the brick wall model is analyzed in a rotating background. It is shown that in the Kerr background without horizon but with an inner boundary a scalar field has complex-frequency modes and that, however, the imaginary part of the complex frequency can be small enough compared with the Hawking temperatu... |
1602.02828 | Lee Lindblom | Lee Lindblom and Curt Cutler | Model Waveform Accuracy Requirements for the Allen $\chi^2$
Discriminator | 5 pages, v2 revised to version to appear in Phys. Rev. D | Phys. Rev. D 94, 124030 (2016) | 10.1103/PhysRevD.94.124030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper derives accuracy standards for model gravitational waveforms
required to ensure proper use of the Allen $\chi^2$ discriminator in
gravitational wave (GW) data analysis. These standards are different from
previously established requirements for detection and waveform parameter
measurement based on signal-to... | [
{
"created": "Tue, 9 Feb 2016 00:42:01 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2016 21:15:34 GMT",
"version": "v2"
}
] | 2016-12-28 | [
[
"Lindblom",
"Lee",
""
],
[
"Cutler",
"Curt",
""
]
] | This paper derives accuracy standards for model gravitational waveforms required to ensure proper use of the Allen $\chi^2$ discriminator in gravitational wave (GW) data analysis. These standards are different from previously established requirements for detection and waveform parameter measurement based on signal-to-n... |
2401.15654 | Rong-Jia Yang | Yinan Jia, Tong-Yu He, Wen-Qian Wang, Zhan-Wen Han, Rong-Jia Yang | Accretion of matter by a Charged dilaton black hole | 9 pages, 3 figures | Eur.Phys.J.C 84 (2024) 5, 501 | 10.1140/epjc/s10052-024-12856-w | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Considering accretion onto a charged dilaton black hole, the fundamental
equations governing accretion, general analytic expressions for critical
points, critical velocity, critical speed of sound, and ultimately the mass
accretion rate are obtained. A new constraint on the dilation parameter coming
from string theor... | [
{
"created": "Sun, 28 Jan 2024 13:13:07 GMT",
"version": "v1"
},
{
"created": "Sat, 18 May 2024 13:24:22 GMT",
"version": "v2"
}
] | 2024-05-21 | [
[
"Jia",
"Yinan",
""
],
[
"He",
"Tong-Yu",
""
],
[
"Wang",
"Wen-Qian",
""
],
[
"Han",
"Zhan-Wen",
""
],
[
"Yang",
"Rong-Jia",
""
]
] | Considering accretion onto a charged dilaton black hole, the fundamental equations governing accretion, general analytic expressions for critical points, critical velocity, critical speed of sound, and ultimately the mass accretion rate are obtained. A new constraint on the dilation parameter coming from string theory ... |
1902.05215 | Pitayuth Wongjun | P. Boonserm, T. Ngampitipan and P. Wongjun | Greybody factor for black string in dRGT massive gravity | 18 pages, 12 figures; V2 accepted to EPJC, minor change, two column
11 pages, 12 figures | null | 10.1140/epjc/s10052-019-6827-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The greybody factor from the black string in the de Rham-Gabadadze-Tolley
(dRGT) massive gravity theory is investigated in this study. The dRGT massive
gravity theory is one of the modified gravity theories used in explaining the
current acceleration in the expansion of the universe. By using cylindrical
symmetry, bl... | [
{
"created": "Thu, 14 Feb 2019 04:35:50 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Mar 2019 08:00:11 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Boonserm",
"P.",
""
],
[
"Ngampitipan",
"T.",
""
],
[
"Wongjun",
"P.",
""
]
] | The greybody factor from the black string in the de Rham-Gabadadze-Tolley (dRGT) massive gravity theory is investigated in this study. The dRGT massive gravity theory is one of the modified gravity theories used in explaining the current acceleration in the expansion of the universe. By using cylindrical symmetry, blac... |
gr-qc/0510112 | Euro Spallucci | Piero Nicolini, Anais Smailagic, Euro Spallucci | Noncommutative geometry inspired Schwarzschild black hole | 7 pages, Revtex, 4 eps figures, final version, accepted for
publication in Phys.Lett. B | Phys.Lett.B632:547-551,2006 | 10.1016/j.physletb.2005.11.004 | null | gr-qc hep-th | null | We investigate the behavior of a noncommutative radiating Schwarzschild black
hole. It is shown that coordinate noncommutativity cures usual problems
encountered in the description of the terminal phase of black hole evaporation.
More in detail, we find that: the evaporation end-point is a zero temperature
extremal b... | [
{
"created": "Wed, 26 Oct 2005 09:55:41 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2005 12:17:30 GMT",
"version": "v2"
},
{
"created": "Sat, 5 Nov 2005 07:44:06 GMT",
"version": "v3"
},
{
"created": "Sat, 12 Nov 2005 07:59:01 GMT",
"version": "v4"
}
] | 2010-04-06 | [
[
"Nicolini",
"Piero",
""
],
[
"Smailagic",
"Anais",
""
],
[
"Spallucci",
"Euro",
""
]
] | We investigate the behavior of a noncommutative radiating Schwarzschild black hole. It is shown that coordinate noncommutativity cures usual problems encountered in the description of the terminal phase of black hole evaporation. More in detail, we find that: the evaporation end-point is a zero temperature extremal bla... |
2104.07480 | Alessandro Tronconi | A. Y. Kamenshchik, A. Tronconi, G. Venturi | Born-Oppenheimer meets Wigner-Weyl in Quantum Gravity | 15 pages, no figures | null | 10.1088/1361-6382/ac1b0a | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Starting from a Born-Oppenheimer decomposition of the Wheeler-DeWitt equation
for the quantum cosmology of the matter-gravity system, we have performed a
Wigner-Weyl transformation and obtained equations involving a Wigner function
for the scale factor and its conjugate momentum. This has allowed us to study
in more ... | [
{
"created": "Thu, 15 Apr 2021 14:15:24 GMT",
"version": "v1"
}
] | 2021-09-22 | [
[
"Kamenshchik",
"A. Y.",
""
],
[
"Tronconi",
"A.",
""
],
[
"Venturi",
"G.",
""
]
] | Starting from a Born-Oppenheimer decomposition of the Wheeler-DeWitt equation for the quantum cosmology of the matter-gravity system, we have performed a Wigner-Weyl transformation and obtained equations involving a Wigner function for the scale factor and its conjugate momentum. This has allowed us to study in more de... |
2001.11964 | Matt Visser | Francisco S. N. Lobo (Universidade de Lisboa), Jose Pedro Mimoso
(Universidade de Lisboa), and Matt Visser (Victoria University of Wellington) | Cosmographic analysis of redshift drift | V1: 24 pages. V2: 25 pages, 2 references added, no physics changes;
V3: Now 24 Pages; this version closely resembles the final published version.
(Reformatted; some discussion added; several references added.) | JCAP 04 (2020) 043 | 10.1088/1475-7516/2020/04/043 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Redshift drift is the phenomenon whereby the observed redshift between an
emitter and observer comoving with the Hubble flow in an expanding FLRW
universe will slowly evolve -- on a timescale comparable to the Hubble time.
There are nevertheless serious astrometric proposals for actually observing
this effect. We sha... | [
{
"created": "Fri, 31 Jan 2020 17:26:25 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Feb 2020 08:41:21 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Oct 2022 23:15:31 GMT",
"version": "v3"
}
] | 2022-10-04 | [
[
"Lobo",
"Francisco S. N.",
"",
"Universidade de Lisboa"
],
[
"Mimoso",
"Jose Pedro",
"",
"Universidade de Lisboa"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Redshift drift is the phenomenon whereby the observed redshift between an emitter and observer comoving with the Hubble flow in an expanding FLRW universe will slowly evolve -- on a timescale comparable to the Hubble time. There are nevertheless serious astrometric proposals for actually observing this effect. We shall... |
1003.2178 | Vladimir Dergachev | Vladimir Dergachev | On blind searches for noise dominated signals: a loosely coherent
approach | Updates to the text to improve exposition | null | 10.1088/0264-9381/27/20/205017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a "loosely coherent" method for detection of continuous
gravitational waves that bridges the gap between semi-coherent and purely
coherent methods. Explicit control over accepted families of signals is used to
increase sensitivity of power-based statistic while avoiding the high
computational costs of co... | [
{
"created": "Wed, 10 Mar 2010 19:17:26 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Aug 2010 18:32:29 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Dergachev",
"Vladimir",
""
]
] | We introduce a "loosely coherent" method for detection of continuous gravitational waves that bridges the gap between semi-coherent and purely coherent methods. Explicit control over accepted families of signals is used to increase sensitivity of power-based statistic while avoiding the high computational costs of conv... |
1804.02699 | Jose Edgar Madriz Aguilar Dr. | M. Montes, Jos\'e Edgar Madriz Aguilar and V. Granados | Gravitoelectromagnetic inflation and seeds of cosmic magnetic fields
from geometrical Weyl-invariant scalar-tensor theory of gravity | 11 pages, 1 figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cosmological inflationary scenarios from a
gravitoelectromagnetic theory. Our work is formulated in the light of a
recently introduced geometrical Weyl-Invariant scalar-tensor theory of gravity,
where the nature of both the electromagnetic potential and the inflaton field
is attributed to the space-tim... | [
{
"created": "Sun, 8 Apr 2018 14:45:12 GMT",
"version": "v1"
}
] | 2018-04-10 | [
[
"Montes",
"M.",
""
],
[
"Aguilar",
"José Edgar Madriz",
""
],
[
"Granados",
"V.",
""
]
] | We investigate cosmological inflationary scenarios from a gravitoelectromagnetic theory. Our work is formulated in the light of a recently introduced geometrical Weyl-Invariant scalar-tensor theory of gravity, where the nature of both the electromagnetic potential and the inflaton field is attributed to the space-time ... |
1405.0139 | Kaushik Bhattacharya | Niladri Paul, Saikat Nil Chakrabarty, Kaushik Bhattacharya | Cosmological bounces in spatially flat FRW spacetimes in metric f(R)
gravity | 41 pages, 17 figures, article. The revised version has some major
modification in the section containing cosmological perturbations, some minor
corrections and a discussion on the stability of the bouncing solution.
Accepted for publication in JCAP | JCAP 1410 (2014) 10, 009 | 10.1088/1475-7516/2014/10/009 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work analyzes the various conditions in which there can be a
bouncing universe solution in f(R) gravity. In the article an interesting
method, to analyze the bouncing FRW solutions in a spatially flat universe
using f(R) gravity models using an effective Einstein frame description of the
process, is prese... | [
{
"created": "Thu, 1 May 2014 11:42:44 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Sep 2014 09:17:23 GMT",
"version": "v2"
}
] | 2014-12-09 | [
[
"Paul",
"Niladri",
""
],
[
"Chakrabarty",
"Saikat Nil",
""
],
[
"Bhattacharya",
"Kaushik",
""
]
] | The present work analyzes the various conditions in which there can be a bouncing universe solution in f(R) gravity. In the article an interesting method, to analyze the bouncing FRW solutions in a spatially flat universe using f(R) gravity models using an effective Einstein frame description of the process, is present... |
1707.00319 | Andreas Sch\"arer | Andreas Sch\"arer, Ruxandra Bondarescu, Prasenjit Saha, Raymond
Ang\'elil, Ravit Helled, Philippe Jetzer | Prospects for Measuring Planetary Spin and Frame-Dragging in Spacecraft
Timing Signals | 10 pages, 6 figures, provisionally accepted for publication in
Frontiers in Astronomy and Space Sciences, section Fundamental Astronomy | null | null | null | gr-qc astro-ph.EP astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Satellite tracking involves sending electromagnetic signals to Earth. Both
the orbit of the spacecraft and the electromagnetic signals themselves are
affected by the curvature of spacetime. The arrival time of the pulses is
compared to the ticks of local clocks to reconstruct the orbital path of the
satellite to high... | [
{
"created": "Sun, 2 Jul 2017 16:51:16 GMT",
"version": "v1"
}
] | 2017-07-06 | [
[
"Schärer",
"Andreas",
""
],
[
"Bondarescu",
"Ruxandra",
""
],
[
"Saha",
"Prasenjit",
""
],
[
"Angélil",
"Raymond",
""
],
[
"Helled",
"Ravit",
""
],
[
"Jetzer",
"Philippe",
""
]
] | Satellite tracking involves sending electromagnetic signals to Earth. Both the orbit of the spacecraft and the electromagnetic signals themselves are affected by the curvature of spacetime. The arrival time of the pulses is compared to the ticks of local clocks to reconstruct the orbital path of the satellite to high a... |
1710.02136 | George Pappas Dr | Kostas Glampedakis, George Pappas | How well can ultracompact bodies imitate black hole ringdowns? | 6 pages, 1 figure, some additional discussion in the text and some
modifications in the figure to indicate the accuracy of the approach.
Accepted for publication as a Rapid Communication in Physical Review D | Phys. Rev. D 97, 041502 (2018) | 10.1103/PhysRevD.97.041502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ongoing observations of merging black holes by the instruments of the
fledging gravitational wave astronomy has opened the way for testing the
general relativistic Kerr black hole metric and, at the same time, for probing
the existence of more speculative horizonless ultracompact objects. In this
paper we quantif... | [
{
"created": "Thu, 5 Oct 2017 17:52:34 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2018 11:42:32 GMT",
"version": "v2"
}
] | 2018-03-07 | [
[
"Glampedakis",
"Kostas",
""
],
[
"Pappas",
"George",
""
]
] | The ongoing observations of merging black holes by the instruments of the fledging gravitational wave astronomy has opened the way for testing the general relativistic Kerr black hole metric and, at the same time, for probing the existence of more speculative horizonless ultracompact objects. In this paper we quantify ... |
2210.03046 | Yuewen Chen | Yuewen Chen, Jie Du, Shing-Tung Yau | Stable Black Hole with Yang-Mills Hair | 6 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present stable solution of static spherically symmetric
Einstein-Yang-Mills equations with the SU(2) gauge group. This solution is
asymptotically flat and regular at r = 0 and with nontrivial Yang-Mills(YM)
connection. With quantized values of the Arnowitt-Deser-Misner (ADM) mass, the
solutions asymptotically appr... | [
{
"created": "Thu, 6 Oct 2022 16:52:29 GMT",
"version": "v1"
}
] | 2022-10-07 | [
[
"Chen",
"Yuewen",
""
],
[
"Du",
"Jie",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | We present stable solution of static spherically symmetric Einstein-Yang-Mills equations with the SU(2) gauge group. This solution is asymptotically flat and regular at r = 0 and with nontrivial Yang-Mills(YM) connection. With quantized values of the Arnowitt-Deser-Misner (ADM) mass, the solutions asymptotically approa... |
1009.3294 | Valerio Ferroni | Valerio Ferroni and Alexander Silbergleit | Electrostatic Patch Effect in Cylindrical Geometry. III. Torques | 28 pages, 6 Figures. Submitted to Classical Quantum Gravity | Class.Quant.Grav.28:145003,2011 | 10.1088/0264-9381/28/14/145003 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue to study the effect of uneven voltage distribution on two close
cylindrical conductors with parallel axes started in our papers [1] and [2],
now to find the electrostatic torques. We calculate the electrostatic potential
and energy to lowest order in the gap to cylinder radius ratio for an arbitrary
relat... | [
{
"created": "Thu, 16 Sep 2010 22:29:54 GMT",
"version": "v1"
}
] | 2011-06-07 | [
[
"Ferroni",
"Valerio",
""
],
[
"Silbergleit",
"Alexander",
""
]
] | We continue to study the effect of uneven voltage distribution on two close cylindrical conductors with parallel axes started in our papers [1] and [2], now to find the electrostatic torques. We calculate the electrostatic potential and energy to lowest order in the gap to cylinder radius ratio for an arbitrary relativ... |
2206.01682 | Pratik Ghosal | Pratik Ghosal and Rajarshi Ray | Probability distribution for black hole evaporation | Accepted in Phys. Rev. D | Phys. Rev. D 105, 124016 (2022) | 10.1103/PhysRevD.105.124016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-thermal correction to the emission probability of particles from black
holes can be obtained if the backreaction or self-gravitational effects of the
emitted particles on the black hole spacetime are taken into consideration.
These non-thermally emitted particles conserve the entropy of the black hole,
i.e, the e... | [
{
"created": "Fri, 3 Jun 2022 16:57:25 GMT",
"version": "v1"
}
] | 2022-06-09 | [
[
"Ghosal",
"Pratik",
""
],
[
"Ray",
"Rajarshi",
""
]
] | Non-thermal correction to the emission probability of particles from black holes can be obtained if the backreaction or self-gravitational effects of the emitted particles on the black hole spacetime are taken into consideration. These non-thermally emitted particles conserve the entropy of the black hole, i.e, the ent... |
0903.2085 | Leo Brewin | Leo Brewin | A brief introduction to Cadabra: a tool for tensor computations in
General Relativity | 15 pages | Comput.Phys.Commun.181:489-498,2010 | 10.1016/j.cpc.2009.10.020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cadabra is a powerful computer program for the manipulation of tensor
equations. It was designed for use in high energy physics but its rich
structure and ease of use lends itself well to the routine computations
required in General Relativity. Here we will present a series of simple
examples showing how Cadabra may ... | [
{
"created": "Thu, 12 Mar 2009 01:47:41 GMT",
"version": "v1"
}
] | 2010-01-21 | [
[
"Brewin",
"Leo",
""
]
] | Cadabra is a powerful computer program for the manipulation of tensor equations. It was designed for use in high energy physics but its rich structure and ease of use lends itself well to the routine computations required in General Relativity. Here we will present a series of simple examples showing how Cadabra may be... |
1006.4979 | Alexander E. Shalyt-Margolin | A. E.Shalyt-Margolin | Deformed Quantum Field Theory, Thermodynamics at Low and High Energies,
and Gravity. II. Deformation Parameter | 27 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is a continuation of studies presented in the papers
arXiv:0911.5597, arXiv:1003.4523. In the work it is demonstrated that with the
use of one and the same parameter deformation may be described for several
cases of the General Relativity within the scope of both the Generalized
Uncertainty Principle (UV-cu... | [
{
"created": "Fri, 25 Jun 2010 12:40:04 GMT",
"version": "v1"
}
] | 2010-06-28 | [
[
"Shalyt-Margolin",
"A. E.",
""
]
] | This work is a continuation of studies presented in the papers arXiv:0911.5597, arXiv:1003.4523. In the work it is demonstrated that with the use of one and the same parameter deformation may be described for several cases of the General Relativity within the scope of both the Generalized Uncertainty Principle (UV-cuto... |
2405.04965 | Laura Niermann | Laura Niermann and Tobias J. Osborne | The evolution of expanding spacetime realizes approximate quantum
cloning | null | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate how quantum information, encoded in a quantum field, evolves
during the expansion of spacetime. Due to information loss across the horizon,
a local observer experiences this evolution as a nonunitary quantum channel. We
obtain this channel in the case of de Sitter spacetime by assuming the initial
glob... | [
{
"created": "Wed, 8 May 2024 11:11:04 GMT",
"version": "v1"
}
] | 2024-05-09 | [
[
"Niermann",
"Laura",
""
],
[
"Osborne",
"Tobias J.",
""
]
] | We investigate how quantum information, encoded in a quantum field, evolves during the expansion of spacetime. Due to information loss across the horizon, a local observer experiences this evolution as a nonunitary quantum channel. We obtain this channel in the case of de Sitter spacetime by assuming the initial global... |
1607.01552 | Vladimir Khatsymovsky | V.M. Khatsymovsky | Spectrum of area in the Faddeev formulation of gravity | 20 pages. ref to our previous work arXiv:1206.5509 is added and
discussed | Mod. Phys. Lett. A, Vol. 31, No. 19 (2016) 1650114 | 10.1142/S0217732316501145 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Faddeev formulation of general relativity (GR) is considered where the metric
is composed of ten vector fields or a ten-dimensional tetrad. Upon partial use
of the field equations, this theory results in the usual GR. Earlier we have
proposed first-order representation of the minisuperspace model for the Faddeev
form... | [
{
"created": "Wed, 6 Jul 2016 10:48:02 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jul 2017 10:08:16 GMT",
"version": "v2"
}
] | 2017-08-01 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | Faddeev formulation of general relativity (GR) is considered where the metric is composed of ten vector fields or a ten-dimensional tetrad. Upon partial use of the field equations, this theory results in the usual GR. Earlier we have proposed first-order representation of the minisuperspace model for the Faddeev formul... |
1511.00569 | Manuel Rodrigues | Manuel E. Rodrigues, Ednaldo L. B. Junior, Glauber T. Marques and
Vilson T. Zanchin | Regular black holes in $f(R)$ gravity coupled to nonlinear
electrodynamics | 18 pages, 4 figures, accepted for publication in PRD | Phys. Rev. D 94, 024062 (2016) | 10.1103/PhysRevD.94.024062 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a class of regular black hole solutions in four-dimensional $f(R)$
gravity, $R$ being the curvature scalar, coupled to a nonlinear electromagnetic
source. The metric formalism is used and static spherically symmetric
spacetimes are assumed. The resulting $f(R)$ and nonlinear electrodynamics
functions are ch... | [
{
"created": "Tue, 20 Oct 2015 10:10:10 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jul 2016 10:47:10 GMT",
"version": "v2"
}
] | 2016-08-02 | [
[
"Rodrigues",
"Manuel E.",
""
],
[
"Junior",
"Ednaldo L. B.",
""
],
[
"Marques",
"Glauber T.",
""
],
[
"Zanchin",
"Vilson T.",
""
]
] | We obtain a class of regular black hole solutions in four-dimensional $f(R)$ gravity, $R$ being the curvature scalar, coupled to a nonlinear electromagnetic source. The metric formalism is used and static spherically symmetric spacetimes are assumed. The resulting $f(R)$ and nonlinear electrodynamics functions are char... |
gr-qc/0008045 | Alberto Carlini | A. Hosoya, A. Carlini and T. Shimomura | Generalized Second Law of Black Hole Thermodynamics and Quantum
Information Theory | 5 pages, RevTex, submitted to PRL | Phys.Rev. D63 (2001) 104008 | 10.1103/PhysRevD.63.104008 | TIT/HEP-454/COSMO-99 | gr-qc quant-ph | null | We propose a quantum version of a gedanken experiment which supports the
generalized second law of black hole thermodynamics. A quantum measurement of
particles in the region outside of the event horizon decreases the entropy of
the outside matter due to the entanglement of the inside and outside particle
states. Thi... | [
{
"created": "Fri, 18 Aug 2000 10:44:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Hosoya",
"A.",
""
],
[
"Carlini",
"A.",
""
],
[
"Shimomura",
"T.",
""
]
] | We propose a quantum version of a gedanken experiment which supports the generalized second law of black hole thermodynamics. A quantum measurement of particles in the region outside of the event horizon decreases the entropy of the outside matter due to the entanglement of the inside and outside particle states. This ... |
0704.2745 | Tomilchik Lev | L.M. Tomilchik | Pioneer Anomaly and Accelerating Universe as Effects of the Minkowski
Space Conformal Symmetry | 13 pages, 3 figures, typos in text and references have been corrected | null | null | null | gr-qc | null | On the basis of the nonisometric transformations subgroup of the SO(4.2)
group, the nonlinear time inhomogeneity one-parameter conformal transformations
are constructed. The connection between the group parameter and the Hubble
constant H0 is established. It is shown that the existence of an anomalous
blue-shifted fr... | [
{
"created": "Fri, 20 Apr 2007 16:16:18 GMT",
"version": "v1"
},
{
"created": "Thu, 10 May 2007 10:07:52 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Tomilchik",
"L. M.",
""
]
] | On the basis of the nonisometric transformations subgroup of the SO(4.2) group, the nonlinear time inhomogeneity one-parameter conformal transformations are constructed. The connection between the group parameter and the Hubble constant H0 is established. It is shown that the existence of an anomalous blue-shifted freq... |
1801.01029 | Bivudutta Mishra Dr. | B. Mishra, Pratik P Ray, R. Myrzakulov | Bulk viscous embedded hybrid dark energy models | 9 pages, 7 figures | Eur. Phy. J. C. 79:34 (2019) | 10.1140/epjc/s10052-019-6535-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have constructed the cosmological model of the universe in
a two fluids environment with a newly developed mathematical formalism. In
order to construct the model Binachi type V (BV) space time is considered with
a time varying deceleration parameter. Both the fluids, the viscous fluid and
the dark ... | [
{
"created": "Mon, 1 Jan 2018 01:37:23 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jan 2018 15:31:05 GMT",
"version": "v2"
}
] | 2019-01-23 | [
[
"Mishra",
"B.",
""
],
[
"Ray",
"Pratik P",
""
],
[
"Myrzakulov",
"R.",
""
]
] | In this paper, we have constructed the cosmological model of the universe in a two fluids environment with a newly developed mathematical formalism. In order to construct the model Binachi type V (BV) space time is considered with a time varying deceleration parameter. Both the fluids, the viscous fluid and the dark en... |
0801.0502 | Tomasz Stachowiak | Jakub Mielczarek, Tomasz Stachowiak, Marek Szydlowski | Exact solutions for Big Bounce in loop quantum cosmology | 12 pages, 12 figures, added references and changed introduction and
summary | Phys.Rev.D77:123506,2008 | 10.1103/PhysRevD.77.123506 | null | gr-qc | null | In this paper we study the flat (k=0) cosmological FRW model with holonomy
corrections of Loop Quantum Gravity. The considered universe contains a
massless scalar field and the cosmological constant Lambda. We find analytical
solutions for this model in different configurations and investigate its
dynamical behaviour... | [
{
"created": "Thu, 3 Jan 2008 21:13:30 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Feb 2008 22:08:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mielczarek",
"Jakub",
""
],
[
"Stachowiak",
"Tomasz",
""
],
[
"Szydlowski",
"Marek",
""
]
] | In this paper we study the flat (k=0) cosmological FRW model with holonomy corrections of Loop Quantum Gravity. The considered universe contains a massless scalar field and the cosmological constant Lambda. We find analytical solutions for this model in different configurations and investigate its dynamical behaviour i... |
1907.02783 | Hrishikesh Patel | Behnam Pourhassan, Anha Bhat, Hrishikesh Patel, Mir Faizal, Nicholas
Mantella | Proposed experimental test of Randall-Sundrum Models | null | Int. J. Mod. Phys. D 31, 01, 2150122 (2022) | 10.1142/S0218271821501224 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Randall-Sundrum models are expected to modify the short distance behavior
of general relativity. In this paper, we will propose an experimental test for
this short distance modification due to Randall-Sundrum models. This will be
done by analyzing motion of a particle which is moving in spherical
gravitational fi... | [
{
"created": "Fri, 5 Jul 2019 11:59:38 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2020 04:48:26 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Pourhassan",
"Behnam",
""
],
[
"Bhat",
"Anha",
""
],
[
"Patel",
"Hrishikesh",
""
],
[
"Faizal",
"Mir",
""
],
[
"Mantella",
"Nicholas",
""
]
] | The Randall-Sundrum models are expected to modify the short distance behavior of general relativity. In this paper, we will propose an experimental test for this short distance modification due to Randall-Sundrum models. This will be done by analyzing motion of a particle which is moving in spherical gravitational fiel... |
gr-qc/0512018 | Walter Christensen Jr. | Walter Christensen Jr | Thermodynamic Behavior of a Perfect Fluid with Negative Energy Density | null | null | null | null | gr-qc | null | Starting from a perfect cosmological fluid represented by the energy momentum
tensor T_uv, one class of frequency metrics that satisfies both Einstein's
general relativistic equation and the perfect fluid condition is: g_uv = e^iwt
N_uv. Mathematically, such metrics indicate spacetime behaves locally like a
simple ha... | [
{
"created": "Mon, 5 Dec 2005 19:44:16 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2005 20:09:27 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Dec 2005 17:35:08 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Dec 2005 00:21:18 GMT",
"version": "v4"
},
{
"crea... | 2007-05-23 | [
[
"Christensen",
"Walter",
"Jr"
]
] | Starting from a perfect cosmological fluid represented by the energy momentum tensor T_uv, one class of frequency metrics that satisfies both Einstein's general relativistic equation and the perfect fluid condition is: g_uv = e^iwt N_uv. Mathematically, such metrics indicate spacetime behaves locally like a simple harm... |
2005.06385 | Szymon Sikora | Szymon Sikora and Krzysztof G{\l}\'od | Construction of the cosmological model with periodically distributed
inhomogeneities with growing amplitude | null | null | 10.1140/epjc/s10052-021-08992-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an approximate solution to the cosmological perturbation theory
around Einstein-de Sitter background up to the fourth-order perturbations. This
could be done with the help of the specific symmetry condition imposed on the
metric, from which follows, that the model density forms an infinite, cubic
lattice... | [
{
"created": "Wed, 13 May 2020 15:51:28 GMT",
"version": "v1"
}
] | 2021-03-17 | [
[
"Sikora",
"Szymon",
""
],
[
"Głód",
"Krzysztof",
""
]
] | We construct an approximate solution to the cosmological perturbation theory around Einstein-de Sitter background up to the fourth-order perturbations. This could be done with the help of the specific symmetry condition imposed on the metric, from which follows, that the model density forms an infinite, cubic lattice. ... |
2308.13017 | Jens Boos | Jens Boos | Regular black hole from a confined spin connection in Poincare gauge
gravity | 7 pages | Phys. Lett. B 848, 138403 (2024) | 10.1016/j.physletb.2023.138403 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the asymptotic safety program, it is possible to construct
renormalization group (RG) improved spacetimes by replacing the gravitational
coupling $G$ by its running counterpart $G(k)$, and subsequently identifying
the RG scale $k$ with a physical distance scale. This procedure has been used
to construct a regu... | [
{
"created": "Thu, 24 Aug 2023 18:30:39 GMT",
"version": "v1"
}
] | 2023-12-20 | [
[
"Boos",
"Jens",
""
]
] | Within the asymptotic safety program, it is possible to construct renormalization group (RG) improved spacetimes by replacing the gravitational coupling $G$ by its running counterpart $G(k)$, and subsequently identifying the RG scale $k$ with a physical distance scale. This procedure has been used to construct a regula... |
1101.3990 | Massimo Tinto | Massimo Tinto | Nano-Hertz Gravitational Waves Searches with Interferometric Pulsar
Timing Experiments | Paper submitted to Phys. Rev. Letters. It is 9 pages long, and
includes 2 figures | Phys.Rev.Lett.106:191101,2011 | 10.1103/PhysRevLett.106.191101 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate the sensitivity to nano-Hertz gravitational waves of pulsar
timing experiments in which two highly-stable millisecond pulsars are tracked
simultaneously with two neighboring radio telescopes that are referenced to the
same time-keeping subsystem (i.e. "the clock"). By taking the difference of the
two time... | [
{
"created": "Thu, 20 Jan 2011 18:43:12 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Tinto",
"Massimo",
""
]
] | We estimate the sensitivity to nano-Hertz gravitational waves of pulsar timing experiments in which two highly-stable millisecond pulsars are tracked simultaneously with two neighboring radio telescopes that are referenced to the same time-keeping subsystem (i.e. "the clock"). By taking the difference of the two time-o... |
1701.01545 | Samuel Loomis | S. P. Loomis and J. David Brown | Continuous body dynamics and the Mathisson-Papapetrou-Dixon equations | null | null | 10.1103/PhysRevD.95.044025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that an effective particle Lagrangian yields the
Mathisson-Papapetrou-Dixon (MPD) equations. The spin of the effective particle
is defined without any reference to a fixed body frame or angular velocity
variable. We then demonstrate that a continuous body, defined by a congruence
of world lines and described ... | [
{
"created": "Fri, 6 Jan 2017 05:13:37 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Loomis",
"S. P.",
""
],
[
"Brown",
"J. David",
""
]
] | We show that an effective particle Lagrangian yields the Mathisson-Papapetrou-Dixon (MPD) equations. The spin of the effective particle is defined without any reference to a fixed body frame or angular velocity variable. We then demonstrate that a continuous body, defined by a congruence of world lines and described by... |
1912.10296 | Jose Manuel Fernandez Queiruga | Jose M. Queiruga | Non-metric construction of spacetime defects | 26 pages, 4 figures | null | null | KA-TP-26-2019 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a spacetime endowed with a non-metricity tensor which effectively
serves as a model of a spacetime foam. We explore the consequences of the
non-metricity in several $f(R)$ theories.
| [
{
"created": "Sat, 21 Dec 2019 16:58:05 GMT",
"version": "v1"
}
] | 2019-12-24 | [
[
"Queiruga",
"Jose M.",
""
]
] | We describe a spacetime endowed with a non-metricity tensor which effectively serves as a model of a spacetime foam. We explore the consequences of the non-metricity in several $f(R)$ theories. |
1905.04917 | Andrea Geralico | Donato Bini, Andrea Geralico, Robert T. Jantzen, Wolfango Plastino | Godel spacetime: elliptic-like geodesics and gyroscope precession | 14 pages, 7 figures; revtex macros | Phys. Rev. D 100, 084051 (2019) | 10.1103/PhysRevD.100.084051 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study elliptic-like geodesic motion on hyperplanes orthogonal to the
cylindrical symmetry axes of the Godel spacetime by using an
eccentricity-semi-latus rectum parametrization which is familiar from the
Newtonian description of a two-body system. We compute several quantities which
summarize the main features of ... | [
{
"created": "Mon, 13 May 2019 08:56:13 GMT",
"version": "v1"
}
] | 2019-10-30 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Jantzen",
"Robert T.",
""
],
[
"Plastino",
"Wolfango",
""
]
] | We study elliptic-like geodesic motion on hyperplanes orthogonal to the cylindrical symmetry axes of the Godel spacetime by using an eccentricity-semi-latus rectum parametrization which is familiar from the Newtonian description of a two-body system. We compute several quantities which summarize the main features of th... |
gr-qc/0612074 | Stefan Zohren | D. Rideout, S. Zohren | Counting entropy in causal set quantum gravity | 5 pages, 1 figure. Talk given by S. Zohren at the Eleventh Marcel
Grossmann Meeting on General Relativity at the Freie U. Berlin, July 23 - 29,
2006 | Proceedings of the Eleventh Marcel Grossmann Meeting on General
Relativity, (ed.) H. Kleinert, R.T. Jantzen and R. Ruffini, World Scientific,
(2008), p. 2803. | null | null | gr-qc | null | The finiteness of black hole entropy suggest that spacetime is fundamentally
discrete, and hints at an underlying relationship between geometry and
"information". The foundation of this relationship is yet to be uncovered, but
should manifest itself in a theory of quantum gravity. We review recent
attempts to define ... | [
{
"created": "Tue, 12 Dec 2006 18:25:40 GMT",
"version": "v1"
}
] | 2008-10-14 | [
[
"Rideout",
"D.",
""
],
[
"Zohren",
"S.",
""
]
] | The finiteness of black hole entropy suggest that spacetime is fundamentally discrete, and hints at an underlying relationship between geometry and "information". The foundation of this relationship is yet to be uncovered, but should manifest itself in a theory of quantum gravity. We review recent attempts to define a ... |
2010.15870 | Kimet Jusufi | Kimet Jusufi, Saurabh | Black Hole Shadows in Verlinde's Emergent Gravity | 10 pages; 8 figures. Accepted for publication in MNRAS | MNRAS, 503, 1310 (2021) | 10.1093/mnras/stab476 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of baryonic matter and apparent dark matter on black hole
shadow in Verlinde's Emergent Gravity. To do so, we consider different baryonic
mass profiles and an optically-thin disk region described by a gas in a radial
free fall around the black hole. Assuming that most of the baryonic matter in
the... | [
{
"created": "Fri, 23 Oct 2020 10:44:43 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2021 16:33:22 GMT",
"version": "v2"
}
] | 2021-03-26 | [
[
"Jusufi",
"Kimet",
""
],
[
"Saurabh",
"",
""
]
] | We study the effect of baryonic matter and apparent dark matter on black hole shadow in Verlinde's Emergent Gravity. To do so, we consider different baryonic mass profiles and an optically-thin disk region described by a gas in a radial free fall around the black hole. Assuming that most of the baryonic matter in the g... |
2310.13423 | Tiberiu Harko | Piyabut Burikham, Tiberiu Harko, Kulapant Pimsamarn, Shahab Shahidi | Reply to Comment on "Dark matter as a Weyl geometric effect" | 4 pages, no figures | null | null | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent Comment on the paper "Dark matter as a Weyl geometric effect", by
Burikham et al., Phys. Rev. D 107, 064008 (2023), posted on arxiv. org as
eprint arXiv:2306.11926, it was claimed that the exact solution found in the
above mentioned paper by Burikham et al. "is wrong". In this Reply to the
Comment we pres... | [
{
"created": "Fri, 20 Oct 2023 11:23:40 GMT",
"version": "v1"
}
] | 2023-10-23 | [
[
"Burikham",
"Piyabut",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Pimsamarn",
"Kulapant",
""
],
[
"Shahidi",
"Shahab",
""
]
] | In a recent Comment on the paper "Dark matter as a Weyl geometric effect", by Burikham et al., Phys. Rev. D 107, 064008 (2023), posted on arxiv. org as eprint arXiv:2306.11926, it was claimed that the exact solution found in the above mentioned paper by Burikham et al. "is wrong". In this Reply to the Comment we presen... |
1210.5317 | Sabine Hossenfelder | Sabine Hossenfelder | Comment on the black hole firewall | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, it has been argued that black hole complementarity is inconsistent
by showing that, for an infalling observer, it would lead to the existence of a
firewall near the black hole horizon, thereby violating the equivalence
principle. If true, this would necessitate to give up on at least one of the
postulates o... | [
{
"created": "Fri, 19 Oct 2012 05:25:08 GMT",
"version": "v1"
}
] | 2012-10-24 | [
[
"Hossenfelder",
"Sabine",
""
]
] | Recently, it has been argued that black hole complementarity is inconsistent by showing that, for an infalling observer, it would lead to the existence of a firewall near the black hole horizon, thereby violating the equivalence principle. If true, this would necessitate to give up on at least one of the postulates of ... |
gr-qc/0702102 | Sunil Maharaj | K. Komathiraj, S. D. Maharaj | Tikekar superdense stars in electric fields | 15 pages, To appear in J. Math. Phys | J.Math.Phys.48:042501,2007 | 10.1063/1.2716204 | null | gr-qc | null | We present exact solutions to the Einstein-Maxwell system of equations with a
specified form of the electric field intensity by assuming that the
hypersurface \{$t$ = constant\} are spheroidal. The solution of the
Einstein-Maxwell system is reduced to a recurrence relation with variable
rational coefficients which ca... | [
{
"created": "Mon, 19 Feb 2007 07:07:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Komathiraj",
"K.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | We present exact solutions to the Einstein-Maxwell system of equations with a specified form of the electric field intensity by assuming that the hypersurface \{$t$ = constant\} are spheroidal. The solution of the Einstein-Maxwell system is reduced to a recurrence relation with variable rational coefficients which can ... |
2208.05506 | Gabriel Escrig Mas | Gabriel Escrig, Roberto Campos, Pablo A. M. Casares and M. A.
Martin-Delgado | Parameter Estimation of Gravitational Waves with a Quantum Metropolis
Algorithm | RevTex 4.2, 3 color Figures and 1 Table | Classical and Quantum Gravity 40(4) 045001, 2023 | 10.1088/1361-6382/acafcf | null | gr-qc astro-ph.HE quant-ph | http://creativecommons.org/licenses/by/4.0/ | After the first detection of a gravitational wave in 2015, the number of
successes achieved by this innovative way of looking through the universe has
not stopped growing. However, the current techniques for analyzing this type of
events present a serious bottleneck due to the high computational power they
require. I... | [
{
"created": "Wed, 10 Aug 2022 18:01:21 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2023 15:56:30 GMT",
"version": "v2"
}
] | 2023-05-11 | [
[
"Escrig",
"Gabriel",
""
],
[
"Campos",
"Roberto",
""
],
[
"Casares",
"Pablo A. M.",
""
],
[
"Martin-Delgado",
"M. A.",
""
]
] | After the first detection of a gravitational wave in 2015, the number of successes achieved by this innovative way of looking through the universe has not stopped growing. However, the current techniques for analyzing this type of events present a serious bottleneck due to the high computational power they require. In ... |
0807.3854 | Joel Saavedra | Norman Cruz, Samuel Lepe, Francisco Pena and Joel Saavedra | Holographic dark energy interacting with dark matter in a Closed
Universe | 9 pages | Phys.Lett.B669:271-274,2008 | 10.1016/j.physletb.2008.10.008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological model of an holographic dark energy interacting with dark
matter throughout a decaying term of the form $Q=3(\lambda_1\rho_{DE} +
\lambda_2\rho_m) H$ is investigated. General constraint on the parameters of
the model are found when accelerated expansion is imposed and we found a
phantom scenarios, with... | [
{
"created": "Thu, 24 Jul 2008 16:39:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cruz",
"Norman",
""
],
[
"Lepe",
"Samuel",
""
],
[
"Pena",
"Francisco",
""
],
[
"Saavedra",
"Joel",
""
]
] | A cosmological model of an holographic dark energy interacting with dark matter throughout a decaying term of the form $Q=3(\lambda_1\rho_{DE} + \lambda_2\rho_m) H$ is investigated. General constraint on the parameters of the model are found when accelerated expansion is imposed and we found a phantom scenarios, withou... |
2110.11397 | Ali \"Ovg\"un Dr. | Wajiha Javed, Ali Hamza and Ali \"Ovg\"un | Weak Deflection angle and Shadow by Tidal Charged Black Hole | 14 pages, 4 figures. Accepted for publication in Universe.
https://www.mdpi.com/2218-1997/7/10/385 | Universe 2021, 7(10), 385 | 10.3390/universe7100385 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this article, we calculate the deflection angle of tidal charged black
hole (TCBH) in weak field limits. First we obtain the Gaussian optical
curvature and then apply the Gauss-Bonnet theorem on it. With the help of
Gibbons-Werner method, we are able to calculate the light's deflection angle by
TCBH in weak field ... | [
{
"created": "Tue, 19 Oct 2021 08:24:27 GMT",
"version": "v1"
}
] | 2021-10-25 | [
[
"Javed",
"Wajiha",
""
],
[
"Hamza",
"Ali",
""
],
[
"Övgün",
"Ali",
""
]
] | In this article, we calculate the deflection angle of tidal charged black hole (TCBH) in weak field limits. First we obtain the Gaussian optical curvature and then apply the Gauss-Bonnet theorem on it. With the help of Gibbons-Werner method, we are able to calculate the light's deflection angle by TCBH in weak field li... |
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