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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1708.03929 | Mariusz Dabrowski P. | Mariusz P. Dabrowski | Singularities and Cyclic Universes | 4 pages, no figures | Acta Phys. Pol. (Proc. Suppl.) B10, 415 (2017) | 10.5506/APhysPolBSupp.10.415 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The models of cyclic universes and cyclic multiverses based on the
alternative gravity theories of varying constants are considered.
| [
{
"created": "Sun, 13 Aug 2017 16:37:53 GMT",
"version": "v1"
}
] | 2017-08-18 | [
[
"Dabrowski",
"Mariusz P.",
""
]
] | The models of cyclic universes and cyclic multiverses based on the alternative gravity theories of varying constants are considered. |
gr-qc/9705041 | Chung-I. Kuo | Chung-I Kuo(Soochow University) | Quantum Fluctuations of Scalar Field in Conical Space | 8 pages, RevTeX file, no figure, to appear in Phys. Lett. B | Phys.Lett. B405 (1997) 236-242 | 10.1016/S0370-2693(97)00594-7 | null | gr-qc | null | We consider vacuum polarization effect of a conformally coupled massless
scalar field in the background produced by an idealized straight cosmic string.
Using previous criterion we show the calculation of back reaction of the field
to the metric in the context of semiclassical gravity theory is not valid , in
some re... | [
{
"created": "Wed, 14 May 1997 15:25:32 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Kuo",
"Chung-I",
"",
"Soochow University"
]
] | We consider vacuum polarization effect of a conformally coupled massless scalar field in the background produced by an idealized straight cosmic string. Using previous criterion we show the calculation of back reaction of the field to the metric in the context of semiclassical gravity theory is not valid , in some regi... |
gr-qc/0301124 | Andrew Makarenko | A.N. Makarenko, V.V. Obukhov, K.E. Osetrin | Kantowski-Sachs Brane Cosmology | 3 pages, other comments | null | null | null | gr-qc | null | We consider brane Kantowski-Sachs Universe when bulk space is
five-dimensional Anti-deSitter space. The corresponding cosmological equations
with perfect fluid are written. For several specific choices of relation
between energy and pressure it is found the behavior of scale factors at early
time. In particulary, for... | [
{
"created": "Fri, 31 Jan 2003 07:18:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Makarenko",
"A. N.",
""
],
[
"Obukhov",
"V. V.",
""
],
[
"Osetrin",
"K. E.",
""
]
] | We consider brane Kantowski-Sachs Universe when bulk space is five-dimensional Anti-deSitter space. The corresponding cosmological equations with perfect fluid are written. For several specific choices of relation between energy and pressure it is found the behavior of scale factors at early time. In particulary, for $... |
1811.06927 | Daniel Hartley | Daniel Hartley and Christian K\"ading and Richard Howl and Ivette
Fuentes | Quantum simulation of dark energy candidates | 26 pages, 3 figures | Phys. Rev. D 99, 105002 (2019) | 10.1103/PhysRevD.99.105002 | null | gr-qc astro-ph.CO cond-mat.quant-gas quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Additional scalar fields from scalar-tensor, modified gravity or higher
dimensional theories beyond general relativity may account for dark energy and
the accelerating expansion of the Universe. These theories have lead to
proposed models of screening mechanisms, such as chameleon and symmetron
fields, to account for... | [
{
"created": "Fri, 16 Nov 2018 17:20:57 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2019 12:20:33 GMT",
"version": "v2"
}
] | 2019-05-14 | [
[
"Hartley",
"Daniel",
""
],
[
"Käding",
"Christian",
""
],
[
"Howl",
"Richard",
""
],
[
"Fuentes",
"Ivette",
""
]
] | Additional scalar fields from scalar-tensor, modified gravity or higher dimensional theories beyond general relativity may account for dark energy and the accelerating expansion of the Universe. These theories have lead to proposed models of screening mechanisms, such as chameleon and symmetron fields, to account for t... |
1711.02723 | Stelios Karydas Mr | B. C. Georgalas, Stelios Karydas, Eleftherios Papantonopoulos | Reconstruction of Cosmological Evolution in the Presence of Extra
Dimensions | 15 pages, 11 figures, version accepted for publication in JCAP,
includes a number of minor clarifications throughout, and a lengthier
discussion of needed/used constraints in Section 4 | null | 10.1088/1475-7516/2018/08/005 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The model of Physics resulting from a Kaluza-Klein dimensional reduction
procedure offers very good dark matter candidates in the form of Light
Kaluza-Klein Particles, and thus becomes relevant to Cosmology. In this work we
recover a late-time cosmological picture, similar to that of the $\Lambda$CDM,
in a multidimen... | [
{
"created": "Tue, 7 Nov 2017 20:53:56 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 2017 08:58:44 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Mar 2018 11:13:26 GMT",
"version": "v3"
},
{
"created": "Mon, 30 Jul 2018 09:09:27 GMT",
"version": "v4"
}
] | 2018-08-15 | [
[
"Georgalas",
"B. C.",
""
],
[
"Karydas",
"Stelios",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
]
] | The model of Physics resulting from a Kaluza-Klein dimensional reduction procedure offers very good dark matter candidates in the form of Light Kaluza-Klein Particles, and thus becomes relevant to Cosmology. In this work we recover a late-time cosmological picture, similar to that of the $\Lambda$CDM, in a multidimensi... |
1206.1420 | Subenoy Chakraborty | Subenoy Chakraborty | Is thermodynamics of the universe bounded by the event horizon a
Bekenstein system? | 4 pages; accepted for publication in Phys. Lett. B | null | 10.1016/j.physletb.2012.11.021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this brief communication, we have studied the validity of the first law of
thermodynamics for the universe bounded by event horizon with two examples. The
key point is the appropriate choice of the temperature on the event horizon.
Finally, we have concluded that universe bounded by the event horizon may be a
Beke... | [
{
"created": "Thu, 7 Jun 2012 08:07:27 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2012 08:08:02 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Chakraborty",
"Subenoy",
""
]
] | In this brief communication, we have studied the validity of the first law of thermodynamics for the universe bounded by event horizon with two examples. The key point is the appropriate choice of the temperature on the event horizon. Finally, we have concluded that universe bounded by the event horizon may be a Bekens... |
gr-qc/0508070 | Domenico Giulini | Domenico Giulini and Gustav Holzegel | Corvino's construction using Brill waves | 14 pages, 2 figures | null | null | Freiburg THEP 05/09 | gr-qc | null | For two-black-hole time-symmetric initial data we consider the Corvino
construction of gluing an exact Schwarzschild end. We propose to do this by
using Brill waves. We address the question of whether this method can be used
to reduce the overall energy, which seems to relate to the question of whether
it can reduce ... | [
{
"created": "Wed, 17 Aug 2005 13:57:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Giulini",
"Domenico",
""
],
[
"Holzegel",
"Gustav",
""
]
] | For two-black-hole time-symmetric initial data we consider the Corvino construction of gluing an exact Schwarzschild end. We propose to do this by using Brill waves. We address the question of whether this method can be used to reduce the overall energy, which seems to relate to the question of whether it can reduce th... |
gr-qc/0103031 | Hisaaki Shinkai | Hisa-aki Shinkai and Gen Yoneda | Will hyperbolic formulations help numerical relativity? - Experiments
using Ashtekar's connection variables | 9 pages, LaTeX, 4 eps figures, for the proceedings of 10th JGRG,
Osaka, Japan, Sept. 11 - 14, 2000 | null | null | CGPG-00/11-3 | gr-qc | null | In order to perform accurate and stable long-term numerical integration of
the Einstein equations, several hyperbolic systems have been proposed. We here
report our numerical comparisons between weakly hyperbolic, strongly
hyperbolic, and symmetric hyperbolic systems based on Ashtekar's connection
variables. The prim... | [
{
"created": "Fri, 9 Mar 2001 19:58:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shinkai",
"Hisa-aki",
""
],
[
"Yoneda",
"Gen",
""
]
] | In order to perform accurate and stable long-term numerical integration of the Einstein equations, several hyperbolic systems have been proposed. We here report our numerical comparisons between weakly hyperbolic, strongly hyperbolic, and symmetric hyperbolic systems based on Ashtekar's connection variables. The primar... |
gr-qc/0106003 | David Waite | David Waite | Inertia Manipulation through Metric Patching | 6 pages | null | null | null | gr-qc | null | This paper will present the exact solution for the stress-energy tensor of a
spherical matter shell of finite thickness that will patch together different
metrics at the boundaries of the shell. The choice of vacuum field solutions
for the shell exterior and hollow interior that we make will allow us to
manipulate th... | [
{
"created": "Sat, 2 Jun 2001 10:26:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Waite",
"David",
""
]
] | This paper will present the exact solution for the stress-energy tensor of a spherical matter shell of finite thickness that will patch together different metrics at the boundaries of the shell. The choice of vacuum field solutions for the shell exterior and hollow interior that we make will allow us to manipulate the ... |
2306.06168 | Jonathan Nay | Jonathan Nay, Kimberly K. Boddy, Tristan L. Smith, Chiara M. F.
Mingarelli | Harmonic Analysis for Pulsar Timing Arrays | 17 pages, 11 figures | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the use of harmonic analysis techniques to perform
measurements of the angular power spectrum on mock pulsar timing data for an
isotropic stochastic gravitational-wave background (SGWB) with a dimensionless
strain amplitude $A_{\text{gw}}=2 \times 10^{-15}$ and spectral index
$\gamma_{\text{gw}}=13/3$.... | [
{
"created": "Fri, 9 Jun 2023 18:00:02 GMT",
"version": "v1"
}
] | 2023-06-13 | [
[
"Nay",
"Jonathan",
""
],
[
"Boddy",
"Kimberly K.",
""
],
[
"Smith",
"Tristan L.",
""
],
[
"Mingarelli",
"Chiara M. F.",
""
]
] | We investigate the use of harmonic analysis techniques to perform measurements of the angular power spectrum on mock pulsar timing data for an isotropic stochastic gravitational-wave background (SGWB) with a dimensionless strain amplitude $A_{\text{gw}}=2 \times 10^{-15}$ and spectral index $\gamma_{\text{gw}}=13/3$. W... |
gr-qc/0106046 | Manoelito M. de Souza | Manoelito M. de Souza | Discrete fields and the Pioneer anomalous acceleration | 8 pages | null | null | null | gr-qc astro-ph hep-th | null | The dominant contributions from a discrete gravitational interaction produce
the standard potential as an effective continuous field. The sub-dominant
contributions are, in a first approximation, linear on n, the accumulated
number of (discrete) interaction events along the test-body trajectory. For a
nearly radial t... | [
{
"created": "Thu, 14 Jun 2001 14:57:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Souza",
"Manoelito M.",
""
]
] | The dominant contributions from a discrete gravitational interaction produce the standard potential as an effective continuous field. The sub-dominant contributions are, in a first approximation, linear on n, the accumulated number of (discrete) interaction events along the test-body trajectory. For a nearly radial tra... |
gr-qc/0201014 | Angelo Tartaglia | A. Tartaglia | Space time and rotations | RevTex, 15 pages | null | null | null | gr-qc | null | The paper considers the problem of finding the metric of space time around a
rotating, weakly gravitating body. Both external and internal metric tensors
are consistently found, together with an appropriate source tensor. All tensors
are calculated at the lowest meaningful approximation in a power series. The
two phy... | [
{
"created": "Fri, 4 Jan 2002 13:18:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tartaglia",
"A.",
""
]
] | The paper considers the problem of finding the metric of space time around a rotating, weakly gravitating body. Both external and internal metric tensors are consistently found, together with an appropriate source tensor. All tensors are calculated at the lowest meaningful approximation in a power series. The two physi... |
gr-qc/0505161 | Fu-Wen Shu | Fu-Wen Shu, You-Gen Shen | Quasinormal modes of Rarita-Schwinger field in Reissner-Nordstr\"{o}m
black hole spacetimes | 9 pages, 2 figures | Phys.Lett.B614:195-200,2005 | 10.1016/j.physletb.2005.03.076 | null | gr-qc | null | The Newman-Penrose formalism is used to deal with the quasinormal
modes(QNM's) of Rarita-Schwinger perturbations outside a Reissner-Nordstr\"{o}m
black hole. We obtain four kinds of possible expressions of effective
potentials, which are proved to be of the same spectra of quasinormal mode
frequencies. The quasinorma... | [
{
"created": "Tue, 31 May 2005 15:22:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Shu",
"Fu-Wen",
""
],
[
"Shen",
"You-Gen",
""
]
] | The Newman-Penrose formalism is used to deal with the quasinormal modes(QNM's) of Rarita-Schwinger perturbations outside a Reissner-Nordstr\"{o}m black hole. We obtain four kinds of possible expressions of effective potentials, which are proved to be of the same spectra of quasinormal mode frequencies. The quasinormal ... |
2107.05723 | Valerio Bozza | F. Aratore, V. Bozza | Decoding a black hole metric from the interferometric pattern of the
relativistic images of a compact source | 20 pages, 8 figures | null | 10.1088/1475-7516/2021/10/054 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Photons emitted by light sources in the neighbourhood of a black hole can
wind several times around it before fleeing towards the observer. For
spherically symmetric black holes, two infinite sequences of images are created
for any given source, asymptotically approaching the shadow border with
decreasing magnitude. ... | [
{
"created": "Mon, 12 Jul 2021 20:29:17 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 2021 07:16:10 GMT",
"version": "v2"
}
] | 2021-10-27 | [
[
"Aratore",
"F.",
""
],
[
"Bozza",
"V.",
""
]
] | Photons emitted by light sources in the neighbourhood of a black hole can wind several times around it before fleeing towards the observer. For spherically symmetric black holes, two infinite sequences of images are created for any given source, asymptotically approaching the shadow border with decreasing magnitude. Th... |
gr-qc/0205035 | Ilja Schmelzer | I. Schmelzer | A generalization of the Lorentz ether to gravity with
general-relativistic limit | Some changes in the presentation | Advances in Applied Clifford Algebras 22, 1 (2012), p. 203-242 | 10.1007/s00006-011-0303-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Does relativistic gravity provide arguments against the existence of a
preferred frame? Our answer is negative. We define a viable theory of gravity
with preferred frame. In this theory, the EEP holds exactly, and the Einstein
equations of GR limit are obtained in a natural limit. Despite some remarkable
differences ... | [
{
"created": "Wed, 8 May 2002 21:24:54 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Nov 2002 16:52:18 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Feb 2011 15:25:59 GMT",
"version": "v3"
},
{
"created": "Sat, 20 Oct 2012 17:35:09 GMT",
"version": "v4"
}
] | 2012-10-23 | [
[
"Schmelzer",
"I.",
""
]
] | Does relativistic gravity provide arguments against the existence of a preferred frame? Our answer is negative. We define a viable theory of gravity with preferred frame. In this theory, the EEP holds exactly, and the Einstein equations of GR limit are obtained in a natural limit. Despite some remarkable differences (s... |
1810.05527 | Abdul Jawad | Abdul Jawad, Shamaila Rani and Salman Rafique | Thermodynamics of Various Entropies in Specific Modified Gravity with
Particle Creation | 32 pages, 12 figures, AHEP accepted. arXiv admin note: text overlap
with arXiv:1801.09999; text overlap with arXiv:1604.00899, arXiv:0811.4477 by
other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the particle creation scenario in the dynamical Chern-Simons
modified gravity in the presence of perfect fluid equation of state
$p=(\gamma-1)\rho$. By assuming various modified entropies (Bekenstein,
logarithmic, power law correction and Reyni), we investigate the first law of
thermodynamics and generali... | [
{
"created": "Wed, 10 Oct 2018 06:33:10 GMT",
"version": "v1"
}
] | 2018-10-15 | [
[
"Jawad",
"Abdul",
""
],
[
"Rani",
"Shamaila",
""
],
[
"Rafique",
"Salman",
""
]
] | We consider the particle creation scenario in the dynamical Chern-Simons modified gravity in the presence of perfect fluid equation of state $p=(\gamma-1)\rho$. By assuming various modified entropies (Bekenstein, logarithmic, power law correction and Reyni), we investigate the first law of thermodynamics and generalize... |
1603.01461 | Naser Sadeghnezhad | N. Sadeghnezhad | A Note on Coherent States with Quantum Gravity Effects | 14 pages, 2 figures | null | 10.1016/j.cjph.2016.06.009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Existence of a minimal measurable length and an upper bound for the momentum
fluctuations are the casting reasons for generalization of uncertainty
principle and then reformulation of Hilbert space representation of quantum
mechanics. In this paper, we study the consequences of the Generalized
Uncertainty Principle (... | [
{
"created": "Fri, 26 Feb 2016 22:46:37 GMT",
"version": "v1"
}
] | 2016-11-29 | [
[
"Sadeghnezhad",
"N.",
""
]
] | Existence of a minimal measurable length and an upper bound for the momentum fluctuations are the casting reasons for generalization of uncertainty principle and then reformulation of Hilbert space representation of quantum mechanics. In this paper, we study the consequences of the Generalized Uncertainty Principle (GU... |
1106.5066 | Eugen Radu | Eugen Radu, Ya. Shnir and D. H. Tchrakian | Scalar hairy black holes and solitons in a gravitating Goldstone model | 17 pages, 5 figures | Phys.Lett.B703:386-393,2011 | 10.1016/j.physletb.2011.08.032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study black hole solutions of Einstein gravity coupled to a specific
global symmetry breaking Goldstone model described by an O(3) isovector scalar
field in four spacetime dimensions. Our configurations are static and
spherically symmetric, approaching at infinity a Minkowski spacetime
background. A set of globall... | [
{
"created": "Fri, 24 Jun 2011 20:47:38 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2011 12:08:37 GMT",
"version": "v2"
}
] | 2011-09-07 | [
[
"Radu",
"Eugen",
""
],
[
"Shnir",
"Ya.",
""
],
[
"Tchrakian",
"D. H.",
""
]
] | We study black hole solutions of Einstein gravity coupled to a specific global symmetry breaking Goldstone model described by an O(3) isovector scalar field in four spacetime dimensions. Our configurations are static and spherically symmetric, approaching at infinity a Minkowski spacetime background. A set of globally ... |
0906.3088 | Michael Gabler | Michael Gabler, Ulrich Sperhake and Nils Andersson | Nonlinear radial oscillations of neutron stars | 15 pages, 10 figures, 9 tables; To match published version in
Phys.Rev.D; discussion about interpretation of the expression "mode coupling"
and one figure added | Phys.Rev.D80:064012,2009 | 10.1103/PhysRevD.80.064012 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of nonlinear oscillations in compact stars are attracting
considerable current interest. In order to study such phenomena in the
framework of fully nonlinear general relativity, highly accurate numerical
studies are required. We present a numerical scheme specifically tailored for
studies, based on formul... | [
{
"created": "Wed, 17 Jun 2009 08:48:14 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 2009 06:12:12 GMT",
"version": "v2"
}
] | 2009-09-24 | [
[
"Gabler",
"Michael",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Andersson",
"Nils",
""
]
] | The effects of nonlinear oscillations in compact stars are attracting considerable current interest. In order to study such phenomena in the framework of fully nonlinear general relativity, highly accurate numerical studies are required. We present a numerical scheme specifically tailored for studies, based on formulat... |
2405.08563 | Soma Heydari | Soma Heydari and Kayoomars Karami | Primordial black holes generated by fast-roll mechanism in non-canonical
natural inflation | 29 pages, 6 figures, 5 tables | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this work, a new fast-roll (FR) mechanism to generate primordial black
holes (PBHs) and their coeval gravitational waves (GWs) in generalized
non-canonical natural inflation is introduced. In this model, choosing a
suitable function for non-canonical mass scale parameter $M(\phi)$ gives rise
to produce a cliff-lik... | [
{
"created": "Tue, 14 May 2024 12:51:40 GMT",
"version": "v1"
}
] | 2024-05-15 | [
[
"Heydari",
"Soma",
""
],
[
"Karami",
"Kayoomars",
""
]
] | In this work, a new fast-roll (FR) mechanism to generate primordial black holes (PBHs) and their coeval gravitational waves (GWs) in generalized non-canonical natural inflation is introduced. In this model, choosing a suitable function for non-canonical mass scale parameter $M(\phi)$ gives rise to produce a cliff-like ... |
0803.0786 | S. K. Sahay | S.K. Sahay | On the independent points in the sky for the search of periodic
gravitational wave | 10 Pages, 2 figures | Rom.Rep.Phys.61:191-201,2009 | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the independent points in the sky require to search the
periodic gravitational wave, assuming the noise power spectral density to be
flat. We have made an analysis with different initial azimuth of the Earth for
a week data set. The analysis shows significant difference in the independent
points in the... | [
{
"created": "Thu, 6 Mar 2008 04:15:09 GMT",
"version": "v1"
}
] | 2010-02-05 | [
[
"Sahay",
"S. K.",
""
]
] | We investigate the independent points in the sky require to search the periodic gravitational wave, assuming the noise power spectral density to be flat. We have made an analysis with different initial azimuth of the Earth for a week data set. The analysis shows significant difference in the independent points in the s... |
1807.06105 | David Garfinkle | David Garfinkle | Matters of Gravity, The Newsletter of the Division of Gravitational
Physics of the American Physical Society, Volume 51, June 2018 | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | DGRAV News:
We hear that....
DGRAV Student Travel Grants
Town Hall Meeting
GRG Society
Research Briefs:
What's new in LIGO
Conference Reports:
Christodoulou Conference
Obituaries:
Stephen Hawking (1942-2018)
Joseph Polchinski (1954-2018)
| [
{
"created": "Mon, 16 Jul 2018 20:54:51 GMT",
"version": "v1"
}
] | 2018-07-18 | [
[
"Garfinkle",
"David",
""
]
] | DGRAV News: We hear that.... DGRAV Student Travel Grants Town Hall Meeting GRG Society Research Briefs: What's new in LIGO Conference Reports: Christodoulou Conference Obituaries: Stephen Hawking (1942-2018) Joseph Polchinski (1954-2018) |
0808.3120 | L. C. Garcia de Andrade | Garcia de Andrade | Acoustic black hole evaporation as plasma diffusion phenomena | Dept fisica teorica-UERJ-Brasil | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Acoustic analogues of Kerr black hole in plasmas are considered, by taking
for granted the existence of acoustic ion waves in plasmas. An effective black
holes (BH) in curved Riemannian spacetime in a random walk plasmas is endowed
with a naked singularity, when plasmas are in the lowest diffusion mode. The
plasma pa... | [
{
"created": "Fri, 22 Aug 2008 18:23:25 GMT",
"version": "v1"
}
] | 2008-08-25 | [
[
"de Andrade",
"Garcia",
""
]
] | Acoustic analogues of Kerr black hole in plasmas are considered, by taking for granted the existence of acoustic ion waves in plasmas. An effective black holes (BH) in curved Riemannian spacetime in a random walk plasmas is endowed with a naked singularity, when plasmas are in the lowest diffusion mode. The plasma part... |
gr-qc/0004003 | Shahar Hod | Shahar Hod | Evidence for a null entropy of extremal black holes | 11 pages | Phys.Rev. D61 (2000) 084018 | 10.1103/PhysRevD.61.084018 | null | gr-qc hep-th | null | We present some arguments in support of a {\it zero} entropy for {\it
extremal} black holes. These rely on a combination of both quantum,
thermodynamic, and statistical physics arguments. This result may shed some
light on the nature of these extreme objects. In addition, we show that within
a {\it quantum} framework... | [
{
"created": "Sat, 1 Apr 2000 06:38:19 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Apr 2000 10:15:34 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Hod",
"Shahar",
""
]
] | We present some arguments in support of a {\it zero} entropy for {\it extremal} black holes. These rely on a combination of both quantum, thermodynamic, and statistical physics arguments. This result may shed some light on the nature of these extreme objects. In addition, we show that within a {\it quantum} framework t... |
0705.1346 | Alexey Toporensky | A. Toporensky, P. Tretyakov | Power-law anisotropic cosmological solution in 5+1 dimensional
Gauss-Bonnet gravity | 10 pages, one statement corrected, references added | Grav.Cosmol.13:207-210,2007 | null | null | gr-qc | null | We write down an anisotropic solution for a flat 5+1 dimensional Universe in
Gauss-Bonnet gravity. In the model under investigation this solution replaces
the generalized Kasner solution near a cosmological singularity.
| [
{
"created": "Wed, 9 May 2007 19:21:52 GMT",
"version": "v1"
},
{
"created": "Tue, 22 May 2007 19:34:23 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Aug 2007 17:39:08 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Toporensky",
"A.",
""
],
[
"Tretyakov",
"P.",
""
]
] | We write down an anisotropic solution for a flat 5+1 dimensional Universe in Gauss-Bonnet gravity. In the model under investigation this solution replaces the generalized Kasner solution near a cosmological singularity. |
1507.06123 | Ivan de Martino | Ivan de Martino, Mariafelicia De Laurentis, Salvatore Capozziello | Constraining $f(R)$ gravity by the Large Scale Structure | 37 pages, 3 Tables, 6 Figures. Invited Review belonging "Special
Issue Modified Gravity Cosmology: From Inflation to Dark Energy". The
manuscript matches the accepted version. References updated | Universe 2015, 1(2), 123-157 | 10.3390/universe1020123 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Over the past decades, General Relativity and the concordance $\Lambda$CDM
model have been successfully tested using several different astrophysical and
cosmological probes based on large datasets ({\it precision cosmology}).
Despite their successes, some shortcomings emerge due to the fact that General
Relativity sh... | [
{
"created": "Wed, 22 Jul 2015 10:53:38 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jul 2015 21:53:06 GMT",
"version": "v2"
}
] | 2015-08-07 | [
[
"de Martino",
"Ivan",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | Over the past decades, General Relativity and the concordance $\Lambda$CDM model have been successfully tested using several different astrophysical and cosmological probes based on large datasets ({\it precision cosmology}). Despite their successes, some shortcomings emerge due to the fact that General Relativity shou... |
1808.04412 | Jose Luis Flores | L. Ak\'e Hau, Jos\'e L. Flores, Miguel S\'anchez | Structure of globally hyperbolic spacetimes with timelike boundary | Added Appendix B and four references, several improvements in section
2.4 and other minor modifications. To appear in Rev. Mat. Iberoamericana | Rev. Matem. Iberoamericana, Volume 37, Issue 1 (2021) pp. 45-94 | 10.4171/rmi/1201 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Globally hyperbolic spacetimes with timelike boundary $(\overline{M} = M \cup
\partial M, g)$ are the natural class of spacetimes where regular boundary
conditions (eventually asymptotic, if $\overline{M}$ is obtained by means of a
conformal embedding) can be posed. $\partial M$ represents the naked
singularities and... | [
{
"created": "Mon, 13 Aug 2018 19:31:11 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2018 06:51:11 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Nov 2018 23:06:47 GMT",
"version": "v3"
},
{
"created": "Wed, 14 Aug 2019 08:59:21 GMT",
"version": "v4"
}
] | 2021-04-23 | [
[
"Hau",
"L. Aké",
""
],
[
"Flores",
"José L.",
""
],
[
"Sánchez",
"Miguel",
""
]
] | Globally hyperbolic spacetimes with timelike boundary $(\overline{M} = M \cup \partial M, g)$ are the natural class of spacetimes where regular boundary conditions (eventually asymptotic, if $\overline{M}$ is obtained by means of a conformal embedding) can be posed. $\partial M$ represents the naked singularities and c... |
1411.7878 | Georgios Doulis | Georgios Doulis and Oliver Rinne | Numerical construction of initial data for Einstein's equations with
static extension to space-like infinity | 20 pages, 13 figures. Agrees with the published version | Class. Quantum Grav. 33, 075014 (2016) | 10.1088/0264-9381/33/7/075014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a numerical method to construct Cauchy data extending to
space-like infinity based on Corvino's (2000) gluing method. Adopting the
setting of Giulini and Holzegel (2005), we restrict ourselves here to vacuum
axisymmetric spacetimes and glue a Schwarzschildean end to Brill-Lindquist data
describing two non... | [
{
"created": "Fri, 28 Nov 2014 14:30:13 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Nov 2015 12:54:39 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Dec 2016 10:41:48 GMT",
"version": "v3"
}
] | 2016-12-30 | [
[
"Doulis",
"Georgios",
""
],
[
"Rinne",
"Oliver",
""
]
] | We describe a numerical method to construct Cauchy data extending to space-like infinity based on Corvino's (2000) gluing method. Adopting the setting of Giulini and Holzegel (2005), we restrict ourselves here to vacuum axisymmetric spacetimes and glue a Schwarzschildean end to Brill-Lindquist data describing two non-r... |
1111.4586 | J. Brian Pitts | J. Brian Pitts | The Nontriviality of Trivial General Covariance: How Electrons Restrict
'Time' Coordinates, Spinors (Almost) Fit into Tensor Calculus, and 7/16 of a
Tetrad Is Surplus Structure | Forthcoming in \textit{Studies in History and Philosophy of Modern
Physics} | Studies in History and Philosophy of Modern Physics 43 (2012) 1-24 | 10.1016/j.shpsb.2011.11.001 | null | gr-qc hep-th math-ph math.MP physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is a commonplace that any theory can be written in any coordinates via
tensor calculus. But it is claimed that spinors as such cannot be represented
in coordinates in a curved space-time. What general covariance means for
theories with fermions is thus unclear. In fact both commonplaces are wrong.
Though it is not... | [
{
"created": "Sat, 19 Nov 2011 21:39:44 GMT",
"version": "v1"
}
] | 2016-03-21 | [
[
"Pitts",
"J. Brian",
""
]
] | It is a commonplace that any theory can be written in any coordinates via tensor calculus. But it is claimed that spinors as such cannot be represented in coordinates in a curved space-time. What general covariance means for theories with fermions is thus unclear. In fact both commonplaces are wrong. Though it is not w... |
1302.5560 | Burkhard Kleihaus | Efstathios Charalampidis, Theodora Ioannidou, Burkhard Kleihaus and
Jutta Kunz | Wormholes Threaded by Chiral Fields | 14 pages, 9 figures | null | 10.1103/PhysRevD.87.084069 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Lorentzian wormholes with a phantom field and chiral matter
fields. The chiral fields are described by the non-linear sigma model with or
without a Skyrme term. When the gravitational coupling of the chiral fields is
increased, the wormhole geometry changes. The single throat is replaced by a
double throa... | [
{
"created": "Fri, 22 Feb 2013 11:43:55 GMT",
"version": "v1"
}
] | 2013-05-08 | [
[
"Charalampidis",
"Efstathios",
""
],
[
"Ioannidou",
"Theodora",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] | We consider Lorentzian wormholes with a phantom field and chiral matter fields. The chiral fields are described by the non-linear sigma model with or without a Skyrme term. When the gravitational coupling of the chiral fields is increased, the wormhole geometry changes. The single throat is replaced by a double throat ... |
1509.04243 | Gabor Kunstatter | Gabor Kunstatter, Hideki Maeda, and Tim Taves | Designer black holes from new 2D gravity | 11 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a family of extensions of spherically symmetric
Einstein-Lanczos-Lovelock gravity. The field equations are second order and
obey a generalized Birkhoff's theorem. The Hamiltonian constraint can be
written in terms of a generalized Misner-Sharp mass function that determines
the form of the vacuum solution. ... | [
{
"created": "Mon, 14 Sep 2015 19:04:50 GMT",
"version": "v1"
}
] | 2015-09-16 | [
[
"Kunstatter",
"Gabor",
""
],
[
"Maeda",
"Hideki",
""
],
[
"Taves",
"Tim",
""
]
] | We present a family of extensions of spherically symmetric Einstein-Lanczos-Lovelock gravity. The field equations are second order and obey a generalized Birkhoff's theorem. The Hamiltonian constraint can be written in terms of a generalized Misner-Sharp mass function that determines the form of the vacuum solution. Th... |
1505.02188 | Hooman Moradpour Hooman | H. Moradpour, N. Riazi | Spherically symmetric solutions in a FRW background | null | Mod. Phys. Lett. A 8, (2015) 1550042 | 10.1142/S021773231550042X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We impose perfect fluid concept along with slow expansion approximation to
derive new solutions which, considering non-static spherically symmetric
metrics, can be treated as Black Holes (BHs). We will refer to these solutions
as Quasi BHs. Mathematical and physical features such as Killing vectors,
singularities, an... | [
{
"created": "Mon, 4 May 2015 14:58:47 GMT",
"version": "v1"
}
] | 2015-05-12 | [
[
"Moradpour",
"H.",
""
],
[
"Riazi",
"N.",
""
]
] | We impose perfect fluid concept along with slow expansion approximation to derive new solutions which, considering non-static spherically symmetric metrics, can be treated as Black Holes (BHs). We will refer to these solutions as Quasi BHs. Mathematical and physical features such as Killing vectors, singularities, and ... |
1602.05594 | Vladimir Ivashchuk | A.A. Kobtsev, V.D. Ivashchuk and K.K. Ernazarov | On multidimensional solutions in the Einstein-Gauss-Bonnet model with a
cosmological term | 7 pages, Latex, no figures. To be published in: Proceedings of the
XII International Conference on Gravitation, Cosmology and Astrophysics,
(ICGAC-12, June 28-July 5, 2015, Moscow, PFUR), Eds. J.P. Hsu and V.N.
Melnikov, World Scientific Publ., Singapore, 2016 | null | 10.1142/9789814759816_0074 | PFUR-IGC-2016-02/01 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A D-dimensional gravitational model with Gauss-Bonnet and cosmological term
is considered. When ansatz with diagonal cosmological metrics is adopted, we
overview recent solutions for zero cosmological term and find new examples of
solutions for non-zero cosmological term and D = 8 with exponential dependence
of scale... | [
{
"created": "Wed, 17 Feb 2016 21:06:17 GMT",
"version": "v1"
}
] | 2016-03-16 | [
[
"Kobtsev",
"A. A.",
""
],
[
"Ivashchuk",
"V. D.",
""
],
[
"Ernazarov",
"K. K.",
""
]
] | A D-dimensional gravitational model with Gauss-Bonnet and cosmological term is considered. When ansatz with diagonal cosmological metrics is adopted, we overview recent solutions for zero cosmological term and find new examples of solutions for non-zero cosmological term and D = 8 with exponential dependence of scale f... |
1809.01403 | Dieter L\"ust | Dieter Lust, Ward Vleeshouwers | Black Hole Information and Thermodynamics | Revised version with typos corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This SpringerBrief is based on a masters course on black hole thermodynamics
and the black hole information problem taught by Dieter L\"ust during the
summer term 2017 at the Ludwig-Maximilians-Universit\"at in Munich; it was
written by Ward Vleeshouwers. It provides a short introduction to general
relativity, which ... | [
{
"created": "Wed, 5 Sep 2018 09:32:05 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2018 16:26:21 GMT",
"version": "v2"
}
] | 2018-11-27 | [
[
"Lust",
"Dieter",
""
],
[
"Vleeshouwers",
"Ward",
""
]
] | This SpringerBrief is based on a masters course on black hole thermodynamics and the black hole information problem taught by Dieter L\"ust during the summer term 2017 at the Ludwig-Maximilians-Universit\"at in Munich; it was written by Ward Vleeshouwers. It provides a short introduction to general relativity, which de... |
1801.05942 | Shilpa Kastha | Shilpa Kastha, M. Saleem and K G Arun | Imprints of the redshift evolution of double neutron star merger rate on
the signal to noise ratio distribution | 9 pages, 4 figures | Monthly Notices of the Royal Astronomical Society, staa1077, 22
April 2020 | 10.1093/mnras/staa1077 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Proposed third generation gravitational wave (GW) interferometers such as
Cosmic Explorer will have the sensitivity to observe double neutron star (DNS)
mergers up to a redshift of $\sim 5$ with good signal to noise ratios. We argue
that the comoving spatial distribution of DNS mergers leaves a unique imprint
on the ... | [
{
"created": "Thu, 18 Jan 2018 05:32:14 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jul 2019 11:15:23 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Apr 2020 17:50:58 GMT",
"version": "v3"
}
] | 2020-06-16 | [
[
"Kastha",
"Shilpa",
""
],
[
"Saleem",
"M.",
""
],
[
"Arun",
"K G",
""
]
] | Proposed third generation gravitational wave (GW) interferometers such as Cosmic Explorer will have the sensitivity to observe double neutron star (DNS) mergers up to a redshift of $\sim 5$ with good signal to noise ratios. We argue that the comoving spatial distribution of DNS mergers leaves a unique imprint on the st... |
1810.11486 | Seramika Ariwahjoedi | S. Ariwahjoedi, I. Husin, I. Sebastian, F. P. Zen | Hermiticity of the Volume Operators in Loop Quantum Gravity | 15 pages, no figure | Gen. Rel. Grav. 51, 58 (2019) | 10.1007/s10714-019-2541-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this article is to provide a rigorous-but-simple steps to prove
the hermiticity of the volume operator of Rovelli-Smolin and
Ashtekar-Lewandowski using the angular momentum approach, as well as pointing
out some subleties which have not been given a lot of attention previously.
Besides of being hermitian, ... | [
{
"created": "Fri, 26 Oct 2018 18:26:53 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2018 15:32:15 GMT",
"version": "v2"
}
] | 2021-03-30 | [
[
"Ariwahjoedi",
"S.",
""
],
[
"Husin",
"I.",
""
],
[
"Sebastian",
"I.",
""
],
[
"Zen",
"F. P.",
""
]
] | The aim of this article is to provide a rigorous-but-simple steps to prove the hermiticity of the volume operator of Rovelli-Smolin and Ashtekar-Lewandowski using the angular momentum approach, as well as pointing out some subleties which have not been given a lot of attention previously. Besides of being hermitian, we... |
2009.14582 | Jackson Levi Said | Rebecca Briffa, Salvatore Capozziello, Jackson Levi Said, Jurgen
Mifsud and Emmanuel N. Saridakis | Constraining Teleparallel Gravity through Gaussian Processes | 36 pages, 16 figures | null | 10.1088/1361-6382/abd4f5 | null | gr-qc astro-ph.CO hep-th physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply Gaussian processes (GP) in order to impose constraints on
teleparallel gravity and its $f(T)$ extensions. We use available $H(z)$
observations from (i) cosmic chronometers data (CC); (ii) Supernova Type Ia
(SN) data from the compressed Pantheon release together with the CANDELS and
CLASH Multi-Cycle Treasury... | [
{
"created": "Tue, 29 Sep 2020 10:02:07 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Briffa",
"Rebecca",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Mifsud",
"Jurgen",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We apply Gaussian processes (GP) in order to impose constraints on teleparallel gravity and its $f(T)$ extensions. We use available $H(z)$ observations from (i) cosmic chronometers data (CC); (ii) Supernova Type Ia (SN) data from the compressed Pantheon release together with the CANDELS and CLASH Multi-Cycle Treasury p... |
0807.4559 | Kristin Schleich | K. Schleich and D. M. Witt | Designer de Sitter Spacetimes | 6 pages, no figure, correction of sign in eq. 4 | Can. J. Phys. 86, 591-595 (2008) | 10.1139/P07-191 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent observations in cosmology indicate an accelerating expansion of the
universe postulated to arise from some form of dark energy, the paradigm being
positive cosmological constant. De Sitter spacetime is the well-known isotropic
solution to the Einstein equations with cosmological constant. However, as
discussed... | [
{
"created": "Mon, 28 Jul 2008 23:39:41 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Sep 2008 22:26:40 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Schleich",
"K.",
""
],
[
"Witt",
"D. M.",
""
]
] | Recent observations in cosmology indicate an accelerating expansion of the universe postulated to arise from some form of dark energy, the paradigm being positive cosmological constant. De Sitter spacetime is the well-known isotropic solution to the Einstein equations with cosmological constant. However, as discussed h... |
2210.11959 | Cosimo Bambi | Cosimo Bambi | Search for Variations of Fundamental Constants | 15 pages, no figures. Chapter for the book "Recent Progress on
Gravity Tests" (Eds. C. Bambi and A. C\'ardenas-Avenda\~no, Springer
Singapore, expected in 2023) | null | 10.1007/978-981-97-2871-8_10 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility of variations of the values of fundamental constants is a
phenomenon predicted by a number of scenarios beyond General Relativity. This
can happen if ``our'' fundamental constants are not the actual constants of the
fundamental theory and their value is instead determined, for example, by the
backgrou... | [
{
"created": "Fri, 21 Oct 2022 13:33:56 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Bambi",
"Cosimo",
""
]
] | The possibility of variations of the values of fundamental constants is a phenomenon predicted by a number of scenarios beyond General Relativity. This can happen if ``our'' fundamental constants are not the actual constants of the fundamental theory and their value is instead determined, for example, by the background... |
gr-qc/0001034 | Kazuya Koyama | Kazuya Koyama, Kayoko Maeda and Jiro Soda | Creation of an Open Universe from Valley Bounce | LaTeX, 8 pages, 2 figure, Presented at 9th Workshop on General
Relativity and Gravitation, Hiroshima, Japan, Nov 3-6, 1999, For details see
hep-ph/9910556 | null | null | null | gr-qc | null | It appears difficult to construct a simple model for an open universe based
on the one bubble inflationary scenario. The reason is that one needs a large
mass to avoid the tunneling via the Hawking Moss solution and a small mass for
successful slow-rolling. However, Rubakov and Sibiryakov suggest that the
Hawking Mos... | [
{
"created": "Wed, 12 Jan 2000 09:09:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Koyama",
"Kazuya",
""
],
[
"Maeda",
"Kayoko",
""
],
[
"Soda",
"Jiro",
""
]
] | It appears difficult to construct a simple model for an open universe based on the one bubble inflationary scenario. The reason is that one needs a large mass to avoid the tunneling via the Hawking Moss solution and a small mass for successful slow-rolling. However, Rubakov and Sibiryakov suggest that the Hawking Moss ... |
2205.09758 | Subhayan Maity | Subhayan Maity | Non-equilibrium thermodynamics in the non-canonical scalar field
perturbed space-time : Stability analysis | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The space-time of the Universe has been perturbed under a scalar field $\phi$
considering the minimum coupling between {\phi} and the background metric. The
solutions of Einstein field equations have been obtained under perturbed
geometry and the corresponding conservation equation shows the non-equilibrium
thermodyn... | [
{
"created": "Thu, 19 May 2022 07:29:02 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2022 13:06:20 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jun 2022 18:56:22 GMT",
"version": "v3"
},
{
"created": "Sun, 16 Oct 2022 14:31:15 GMT",
"version": "v4"
}
] | 2022-10-18 | [
[
"Maity",
"Subhayan",
""
]
] | The space-time of the Universe has been perturbed under a scalar field $\phi$ considering the minimum coupling between {\phi} and the background metric. The solutions of Einstein field equations have been obtained under perturbed geometry and the corresponding conservation equation shows the non-equilibrium thermodynam... |
2104.00594 | Gr\'egory Baltus | Gregory Baltus, Justin Janquart, Melissa Lopez, Amit Reza, Sarah
Caudill, Jean-Rene Cudell | Convolutional neural networks for the detection of the early inspiral of
a gravitational-wave signal | 12 pages, 14 figures | Phys. Rev. D 103, 102003 (2021) | 10.1103/PhysRevD.103.102003 | LIGO DCC number LIGO-P2100087 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | GW170817 has led to the first example of multi-messenger astronomy with
observations from gravitational wave interferometers and electromagnetic
telescopes combined to characterise the source. However, detections of the
early inspiral phase by the gravitational wave detectors would allow the
observation of the earlie... | [
{
"created": "Thu, 1 Apr 2021 16:22:09 GMT",
"version": "v1"
}
] | 2021-05-26 | [
[
"Baltus",
"Gregory",
""
],
[
"Janquart",
"Justin",
""
],
[
"Lopez",
"Melissa",
""
],
[
"Reza",
"Amit",
""
],
[
"Caudill",
"Sarah",
""
],
[
"Cudell",
"Jean-Rene",
""
]
] | GW170817 has led to the first example of multi-messenger astronomy with observations from gravitational wave interferometers and electromagnetic telescopes combined to characterise the source. However, detections of the early inspiral phase by the gravitational wave detectors would allow the observation of the earlier ... |
0906.0990 | Guillermo A. Gonzalez | Guillermo A. Gonz\'alez, Antonio C. Guti\'errez-Pi\~neres, Viviana M.
Vi\~na-Cervantes | Exact Static Axially Symmetric Thin Annular Dust Disks | Physics and Mathematics of Gravitation: Proceedings of the Spanish
Relativity Meeting 2008 | AIP Conf.Proc.1122:284-287,2009 | 10.1063/1.3141294 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new family of exact solutions of the Einstein field equations for static
and axially simmetric spacetimes is presented. All the metric functions of the
solutions are explicitly computed and the obtained expressions are simply
written in terms of oblate spheroidal coordinates. The solutions describe an
infinite fami... | [
{
"created": "Thu, 4 Jun 2009 20:19:15 GMT",
"version": "v1"
}
] | 2010-11-22 | [
[
"González",
"Guillermo A.",
""
],
[
"Gutiérrez-Piñeres",
"Antonio C.",
""
],
[
"Viña-Cervantes",
"Viviana M.",
""
]
] | A new family of exact solutions of the Einstein field equations for static and axially simmetric spacetimes is presented. All the metric functions of the solutions are explicitly computed and the obtained expressions are simply written in terms of oblate spheroidal coordinates. The solutions describe an infinite family... |
1009.0647 | Angus Prain | Angus Prain, Serena Fagnocchi and Stefano Liberati | Analogue Cosmological Particle Creation: Quantum Correlations in
Expanding Bose Einstein Condensates | Reference added | Phys.Rev.D82:105018,2010 | 10.1103/PhysRevD.82.105018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the structure of quantum correlations in an expanding Bose
Einstein Condensate (BEC) through the analogue gravity framework. We consider
both a 3+1 isotropically expanding BEC as well as the experimentally relevant
case of an elongated, effectively 1+1 dimensional, expanding condensate. In
this case we... | [
{
"created": "Fri, 3 Sep 2010 12:51:50 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Sep 2010 13:30:34 GMT",
"version": "v2"
}
] | 2010-12-09 | [
[
"Prain",
"Angus",
""
],
[
"Fagnocchi",
"Serena",
""
],
[
"Liberati",
"Stefano",
""
]
] | We investigate the structure of quantum correlations in an expanding Bose Einstein Condensate (BEC) through the analogue gravity framework. We consider both a 3+1 isotropically expanding BEC as well as the experimentally relevant case of an elongated, effectively 1+1 dimensional, expanding condensate. In this case we i... |
2208.03170 | Justin Vines | M. V. S. Saketh and Justin Vines | Scattering of gravitational waves off spinning compact objects with an
effective worldline theory | v2: minor corrections and additional discussion; two-column format;
submitted to PRD | null | 10.1103/PhysRevD.106.124026 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the process, within classical general relativity, in which an
incident gravitational plane wave, of weak amplitude and long wavelength,
scatters off a massive spinning compact object, such as a black hole or neutron
star. The amplitude of the asymptotic scattered wave, considered here at linear
order in Newt... | [
{
"created": "Fri, 5 Aug 2022 13:56:28 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2022 10:43:15 GMT",
"version": "v2"
}
] | 2023-01-04 | [
[
"Saketh",
"M. V. S.",
""
],
[
"Vines",
"Justin",
""
]
] | We study the process, within classical general relativity, in which an incident gravitational plane wave, of weak amplitude and long wavelength, scatters off a massive spinning compact object, such as a black hole or neutron star. The amplitude of the asymptotic scattered wave, considered here at linear order in Newton... |
gr-qc/9711004 | Pierre Savaria | Pierre Savaria | Anisotropic Homogeneous Cosmology in the Nonsymmetric Theory of
Gravitation | 13 pages, TeX, no figure | null | null | UTPT-97-22 | gr-qc | null | Solutions to the field equations of the Nonsymmetric Gravitational Theory
with $g_[i0] = 0$ are obtained for the homogeneous, plane-symmetric,
time-dependent case, both in vacuum and in the presence of a perfect fluid.
Cosmological consequences include a dependence of the speed of light on its
polarisation, as in a b... | [
{
"created": "Mon, 3 Nov 1997 18:58:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Savaria",
"Pierre",
""
]
] | Solutions to the field equations of the Nonsymmetric Gravitational Theory with $g_[i0] = 0$ are obtained for the homogeneous, plane-symmetric, time-dependent case, both in vacuum and in the presence of a perfect fluid. Cosmological consequences include a dependence of the speed of light on its polarisation, as in a bir... |
2203.14595 | Athanasios Bakopoulos | Athanasios Bakopoulos, Christos Charmousis, Panagiota Kanti, Nicolas
Lecoeur | Compact objects of spherical symmetry in beyond Horndeski theories | References updated, typos corrected, matches published version | JHEP 08 (2022) 055 | 10.1007/JHEP08(2022)055 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We analyse in all generality beyond Horndeski theories of shift symmetry in a
static and spherically symmetric spacetime. By introducing four auxiliary
functions, we write the field equations in a particularly compact form. We show
that assuming additionally parity symmetry renders the system directly
integrable givi... | [
{
"created": "Mon, 28 Mar 2022 09:15:15 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2022 16:44:50 GMT",
"version": "v2"
}
] | 2022-08-11 | [
[
"Bakopoulos",
"Athanasios",
""
],
[
"Charmousis",
"Christos",
""
],
[
"Kanti",
"Panagiota",
""
],
[
"Lecoeur",
"Nicolas",
""
]
] | We analyse in all generality beyond Horndeski theories of shift symmetry in a static and spherically symmetric spacetime. By introducing four auxiliary functions, we write the field equations in a particularly compact form. We show that assuming additionally parity symmetry renders the system directly integrable giving... |
1204.1199 | Laszlo Arpad Gergely | Zolt\'an Keresztes, L\'aszl\'o \'A. Gergely, Alexander Yu. Kamenshchik | The paradox of soft singularity crossing and its resolution by
distributional cosmological quantitities | 12 pages; to be published in Phys.Rev.D | Phys.Rev.D86:063522,2012 | 10.1103/PhysRevD.86.063522 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological model of a flat Friedmann universe filled with a mixture of
anti-Chaplygin gas and dust-like matter exhibits a future soft singularity,
where the pressure of the anti-Chaplygin gas diverges (while its energy density
is finite). Despite infinite tidal forces the geodesics pass through the
singularity. D... | [
{
"created": "Thu, 5 Apr 2012 12:28:15 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Sep 2012 09:19:51 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Keresztes",
"Zoltán",
""
],
[
"Gergely",
"László Á.",
""
],
[
"Kamenshchik",
"Alexander Yu.",
""
]
] | A cosmological model of a flat Friedmann universe filled with a mixture of anti-Chaplygin gas and dust-like matter exhibits a future soft singularity, where the pressure of the anti-Chaplygin gas diverges (while its energy density is finite). Despite infinite tidal forces the geodesics pass through the singularity. Due... |
gr-qc/9805102 | Daniel Kennefick | Daniel Kennefick | Stability under radiation reaction of circular equatorial orbits around
Kerr black holes | Revtex, 20 pages including three figures | Phys.Rev. D58 (1998) 064012 | 10.1103/PhysRevD.58.064012 | null | gr-qc | null | We examine the evolution, under gravitational radiation reaction, of slightly
eccentric equatorial orbits of point particles around Kerr black holes. Our
method involves numerical integration of the Sasaki-Nakamura equation. It is
discovered that such orbits decrease in eccentricity throughout most of the
inspiral, u... | [
{
"created": "Fri, 29 May 1998 14:42:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kennefick",
"Daniel",
""
]
] | We examine the evolution, under gravitational radiation reaction, of slightly eccentric equatorial orbits of point particles around Kerr black holes. Our method involves numerical integration of the Sasaki-Nakamura equation. It is discovered that such orbits decrease in eccentricity throughout most of the inspiral, unt... |
1808.05703 | Dimitry Ayzenberg | Harrison Gott, Dimitry Ayzenberg, Nicolas Yunes, Anne Lohfink | Observing the Shadows of Stellar-Mass Black Holes with Binary Companions | 24 pages, 5 Figures, 2 Tables. Videos included in supplemental
material. Submitted to CQG | null | 10.1088/1361-6382/ab01b0 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of the shadows cast by the event horizon of black holes on
the light emitted in its neighborhood is the target of current
very-long-baseline-interferometric observations. When considering supermassive
black holes, the light source is the black hole's accretion disk, and
therefore, the observation of t... | [
{
"created": "Thu, 16 Aug 2018 23:19:14 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Gott",
"Harrison",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Yunes",
"Nicolas",
""
],
[
"Lohfink",
"Anne",
""
]
] | The observation of the shadows cast by the event horizon of black holes on the light emitted in its neighborhood is the target of current very-long-baseline-interferometric observations. When considering supermassive black holes, the light source is the black hole's accretion disk, and therefore, the observation of the... |
0901.4828 | Lau Loi So | Lau Loi So | An alternative non-negative gravitational energy tensor to the
Bel-Robinson tensor | 7 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bel-Robinson tensor $B_{\alpha\beta\mu\nu}$ gives a positive definite
gravitational energy in the small sphere limit approximation. However, there is
an alternative tensor $V_{\alpha\beta\mu\nu}$ which was proposed recently that
offers the same positivity as $B_{\alpha\beta\mu\nu}$ does. These two tensors
are a b... | [
{
"created": "Fri, 30 Jan 2009 06:23:42 GMT",
"version": "v1"
}
] | 2009-02-02 | [
[
"So",
"Lau Loi",
""
]
] | The Bel-Robinson tensor $B_{\alpha\beta\mu\nu}$ gives a positive definite gravitational energy in the small sphere limit approximation. However, there is an alternative tensor $V_{\alpha\beta\mu\nu}$ which was proposed recently that offers the same positivity as $B_{\alpha\beta\mu\nu}$ does. These two tensors are a bas... |
1905.07340 | Adrien Kuntz | Adrien Kuntz | The two-body potential of Vainshtein screened theories | 15 pages, 8 figures | Phys. Rev. D 100, 024024 (2019) | 10.1103/PhysRevD.100.024024 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adding a light scalar degree of freedom to General Relativity often induces a
fifth force whose magnitude is strongly constrained by laboratory experiments
and solar system tests. The Vainshtein screening mechanism ensures that the
effects of this supplementary force are suppressed in dense environments.
However, the... | [
{
"created": "Fri, 17 May 2019 15:55:18 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Kuntz",
"Adrien",
""
]
] | Adding a light scalar degree of freedom to General Relativity often induces a fifth force whose magnitude is strongly constrained by laboratory experiments and solar system tests. The Vainshtein screening mechanism ensures that the effects of this supplementary force are suppressed in dense environments. However, the f... |
gr-qc/9712066 | WU Zhong Chao | Wu Zhong Chao (ICRA) | Quantum Fields in Schwarzschild-de Sitter Space | 24 pages | Int.J.Mod.Phys. D7 (1998) 887-907 | null | ICRA-97-101 | gr-qc hep-th | null | In the No-Boundary Universe a primordial black hole is created from a
constrained gravitational instanton. The black hole created is immersed in the
de Sitter background with a positive cosmological constant. The constrained
instanton is characterized not only by the external parameters, the mass
parameter, charge an... | [
{
"created": "Mon, 15 Dec 1997 20:56:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chao",
"Wu Zhong",
"",
"ICRA"
]
] | In the No-Boundary Universe a primordial black hole is created from a constrained gravitational instanton. The black hole created is immersed in the de Sitter background with a positive cosmological constant. The constrained instanton is characterized not only by the external parameters, the mass parameter, charge and ... |
1108.3550 | Thomas W. Baumgarte | Thomas W. Baumgarte | Puncture black hole initial data in the conformal thin-sandwich
formalism | 17 pages, 4 figures | null | 10.1088/0264-9381/28/21/215003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the construction of puncture black hole initial data in the
conformal thin-sandwich decomposition of Einstein's constraint equations. It
has been shown previously that this approach cannot yield quasiequilibrium
wormhole data, which connect two asymptotically flat spatial infinities. This
argument does not... | [
{
"created": "Wed, 17 Aug 2011 18:59:01 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Baumgarte",
"Thomas W.",
""
]
] | We revisit the construction of puncture black hole initial data in the conformal thin-sandwich decomposition of Einstein's constraint equations. It has been shown previously that this approach cannot yield quasiequilibrium wormhole data, which connect two asymptotically flat spatial infinities. This argument does not a... |
2003.09486 | Roberto Percacci | Roberto Percacci | Towards Metric-Affine Quantum Gravity | Talk given at PAFT2019, Vietri sul Mare, Italy; to appear in
International Journal of Geometric Methods in Modern Physics | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review here some motivations to consider a theory of gravity based on
independent metric and connection, and its status as a quantum theory.
| [
{
"created": "Fri, 20 Mar 2020 20:19:15 GMT",
"version": "v1"
}
] | 2020-03-24 | [
[
"Percacci",
"Roberto",
""
]
] | I review here some motivations to consider a theory of gravity based on independent metric and connection, and its status as a quantum theory. |
gr-qc/9406012 | Haret Rosu | H.C. Rosu | Hawking-like effects and Unruh-like effects: toward experiments ? | 31 pages, revised, a few references updated | Grav.Cosmol. 7 (2001) 1-17 | null | null | gr-qc | null | The Hawking effect and the Unruh effect are two of the most important
predictions in the theoretical physics of the last quarter of the 20th century.
In parallel to the theoretical investigations there is great interest in the
possibility of revealing effects of this type in some sort of experiments. I
present a gene... | [
{
"created": "Mon, 6 Jun 1994 23:40:00 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Apr 1996 01:49:00 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Dec 1997 23:57:24 GMT",
"version": "v3"
},
{
"created": "Wed, 31 Dec 1997 03:20:16 GMT",
"version": "v4"
},
{
"cr... | 2008-02-03 | [
[
"Rosu",
"H. C.",
""
]
] | The Hawking effect and the Unruh effect are two of the most important predictions in the theoretical physics of the last quarter of the 20th century. In parallel to the theoretical investigations there is great interest in the possibility of revealing effects of this type in some sort of experiments. I present a genera... |
1801.08208 | Lionel London | L. London | Modeling ringdown II: non-precessing binary black holes | null | Phys. Rev. D 102, 084052 (2020) | 10.1103/PhysRevD.102.084052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aftermath of binary black hole coalescence is a perturbed remnant whose
gravitational radiation rings down, encoding information about the new black
hole's recent history and current state.It is expected that this ringdown
radiation will be composed primarily of Kerr quasinormal modes, and thereby
enable tests of... | [
{
"created": "Wed, 24 Jan 2018 21:37:28 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 2020 00:44:31 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"London",
"L.",
""
]
] | The aftermath of binary black hole coalescence is a perturbed remnant whose gravitational radiation rings down, encoding information about the new black hole's recent history and current state.It is expected that this ringdown radiation will be composed primarily of Kerr quasinormal modes, and thereby enable tests of g... |
2108.13361 | Daine Danielson | Daine L. Danielson, Gautam Satishchandran, Robert M. Wald, Robert J.
Weinbaum | Bl\'azquez-Salcedo-Knoll-Radu Wormholes Are Not Solutions to the
Einstein-Dirac-Maxwell Equations | 12 pages, no figures | Phys. Rev. D 104, 124055 (2021) | 10.1103/PhysRevD.104.124055 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Recently, Bl\'azquez-Salcedo, Knoll, and Radu (BSKR) have given a class of
static, spherically symmetric, traversable wormhole spacetimes with Dirac and
Maxwell fields. The BSKR wormholes are obtained by joining a classical solution
to the Einstein-Dirac-Maxwell (EDM) equations on the "up" side of the wormhole
($r \g... | [
{
"created": "Mon, 30 Aug 2021 16:33:46 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2021 21:18:53 GMT",
"version": "v2"
}
] | 2021-12-21 | [
[
"Danielson",
"Daine L.",
""
],
[
"Satishchandran",
"Gautam",
""
],
[
"Wald",
"Robert M.",
""
],
[
"Weinbaum",
"Robert J.",
""
]
] | Recently, Bl\'azquez-Salcedo, Knoll, and Radu (BSKR) have given a class of static, spherically symmetric, traversable wormhole spacetimes with Dirac and Maxwell fields. The BSKR wormholes are obtained by joining a classical solution to the Einstein-Dirac-Maxwell (EDM) equations on the "up" side of the wormhole ($r \geq... |
1501.04003 | Surajit Chattopadhyay | Ines G. Salako, Abdul Jawad, Surajit Chattopadhyay | Holographic dark energy reconstruction of $f(T,\mathcal{T})$ gravity | 14 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper reports a holographic reconstruction scheme for
$f(T,\mathcal T)$ gravity proposed in Harko et al. $\emph{JCAP}\; 12(2014)021$
where $T$ is the torsion scalar and $\mathcal{T}$ is the trace of the
energy-momentum tensor considering future event horizon as the enveloping
horizon of the universe. We h... | [
{
"created": "Tue, 6 Jan 2015 09:56:30 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Feb 2015 07:24:06 GMT",
"version": "v2"
}
] | 2015-02-23 | [
[
"Salako",
"Ines G.",
""
],
[
"Jawad",
"Abdul",
""
],
[
"Chattopadhyay",
"Surajit",
""
]
] | The present paper reports a holographic reconstruction scheme for $f(T,\mathcal T)$ gravity proposed in Harko et al. $\emph{JCAP}\; 12(2014)021$ where $T$ is the torsion scalar and $\mathcal{T}$ is the trace of the energy-momentum tensor considering future event horizon as the enveloping horizon of the universe. We hav... |
1410.6678 | Anzhong Wang | Kai Lin, O. Goldoni, M.F. da Silva, and Anzhong Wang | New look at black holes: Existence of universal horizons | revtex4, 17 figures. Version appeared in Phys. Rev. D91, 024047
(2015) | Phys. Rev. D 91, 024047 (2015) | 10.1103/PhysRevD.91.024047 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the existence of universal horizons in a given static
spacetime, and find that the test khronon field can be solved explicitly when
its velocity becomes infinitely large, at which point the universal horizon
coincides with the sound horizon of the khronon. Choosing the timelike
coordinate alig... | [
{
"created": "Thu, 23 Oct 2014 16:21:29 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jan 2015 03:10:17 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Feb 2015 14:20:44 GMT",
"version": "v3"
}
] | 2015-03-05 | [
[
"Lin",
"Kai",
""
],
[
"Goldoni",
"O.",
""
],
[
"da Silva",
"M. F.",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we study the existence of universal horizons in a given static spacetime, and find that the test khronon field can be solved explicitly when its velocity becomes infinitely large, at which point the universal horizon coincides with the sound horizon of the khronon. Choosing the timelike coordinate aligne... |
1908.05442 | Michalis Agathos | Michalis Agathos, Francesco Zappa, Sebastiano Bernuzzi, Albino Perego,
Matteo Breschi and David Radice | Inferring prompt black-hole formation in neutron star mergers from
gravitational-wave data | 14 pages, 14 figures | Phys. Rev. D 101, 044006 (2020) | 10.1103/PhysRevD.101.044006 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational-wave GW170817 is associated to the inspiral phase of a
binary neutron star coalescence event. The LIGO-Virgo detectors sensitivity at
high frequencies was not sufficient to detect the signal corresponding to the
merger and post-merger phases. Hence, the question whether the merger outcome
was a prom... | [
{
"created": "Thu, 15 Aug 2019 07:00:45 GMT",
"version": "v1"
}
] | 2020-02-12 | [
[
"Agathos",
"Michalis",
""
],
[
"Zappa",
"Francesco",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Perego",
"Albino",
""
],
[
"Breschi",
"Matteo",
""
],
[
"Radice",
"David",
""
]
] | The gravitational-wave GW170817 is associated to the inspiral phase of a binary neutron star coalescence event. The LIGO-Virgo detectors sensitivity at high frequencies was not sufficient to detect the signal corresponding to the merger and post-merger phases. Hence, the question whether the merger outcome was a prompt... |
2212.09407 | Vishwa Vijay Singh | Vishwa Vijay Singh and J\"urgen M\"uller and Liliane Biskupek and Eva
Hackmann and Claus L\"ammerzahl | Equivalence of Active and Passive Gravitational Mass Tested with Lunar
Laser Ranging | 4 pages, 1 figure | null | 10.1103/PhysRevLett.131.021401 | null | gr-qc astro-ph.EP physics.space-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | LLR measures the distance between observatories on Earth and retro-reflectors
on Moon since 1969. In this paper, we study the possible violation of the
equality of passive and active gravitational mass ($m_{a}/m_{p}$), for
Aluminium (Al) and Iron (Fe), using LLR data. Our new limit of
$3.9\cdot10^{-14}$ is about 100 ... | [
{
"created": "Mon, 19 Dec 2022 12:37:40 GMT",
"version": "v1"
}
] | 2023-07-17 | [
[
"Singh",
"Vishwa Vijay",
""
],
[
"Müller",
"Jürgen",
""
],
[
"Biskupek",
"Liliane",
""
],
[
"Hackmann",
"Eva",
""
],
[
"Lämmerzahl",
"Claus",
""
]
] | LLR measures the distance between observatories on Earth and retro-reflectors on Moon since 1969. In this paper, we study the possible violation of the equality of passive and active gravitational mass ($m_{a}/m_{p}$), for Aluminium (Al) and Iron (Fe), using LLR data. Our new limit of $3.9\cdot10^{-14}$ is about 100 ti... |
2111.07207 | Michael Efroimsky | Pini Gurfil and Michael Efroimsky | Analysis of the PPN Two-Body Problem Using Non-Osculating Orbital
Elements | null | null | 10.1016/j.asr.2021.09.009 | null | gr-qc astro-ph.EP math.DS | http://creativecommons.org/licenses/by-sa/4.0/ | The parameterised post-Newtonian (PPN) formalism is a weak-field slow-motion
approximation for both GR and some of its generalisations. It permits various
parameterisations of the motion, among which are the Lagrange-type and
Gauss-type orbital equations. Often, these equations are developed under the
Lagrange constr... | [
{
"created": "Sat, 13 Nov 2021 23:16:48 GMT",
"version": "v1"
}
] | 2021-11-16 | [
[
"Gurfil",
"Pini",
""
],
[
"Efroimsky",
"Michael",
""
]
] | The parameterised post-Newtonian (PPN) formalism is a weak-field slow-motion approximation for both GR and some of its generalisations. It permits various parameterisations of the motion, among which are the Lagrange-type and Gauss-type orbital equations. Often, these equations are developed under the Lagrange constrai... |
1510.04010 | Puxun Wu | Yize Fan, Puxun Wu and Hongwei Yu | Spherical collapse in the extended quintessence cosmological models | 17 pages, 4 figures. References added | Physical Review D 92, 083529 (2015) | 10.1103/PhysRevD.92.083529 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the spherical collapse method to investigate the non-linear density
perturbations of pressureless matter in the cosmological models with the
extended quintessence as dark energy in the metric and Palatini formalisms. We
find that for both formalisms, when the coupling constant is negative, the
deviation from t... | [
{
"created": "Wed, 14 Oct 2015 09:02:05 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 2015 15:15:20 GMT",
"version": "v2"
}
] | 2015-11-09 | [
[
"Fan",
"Yize",
""
],
[
"Wu",
"Puxun",
""
],
[
"Yu",
"Hongwei",
""
]
] | We use the spherical collapse method to investigate the non-linear density perturbations of pressureless matter in the cosmological models with the extended quintessence as dark energy in the metric and Palatini formalisms. We find that for both formalisms, when the coupling constant is negative, the deviation from the... |
2112.04065 | Erik Jimenez | Erik Jim\'enez-V\'azquez, Miguel Alcubierre | Critical gravitational collapse of a non-minimally coupled scalar field | null | null | 10.1103/PhysRevD.105.064071 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the critical gravitational collapse of a massless scalar field
non-minimally coupled to gravity, using a quadratic coupling function with a
strength parameter $\xi$. We concentrate on critical phenomena of type II, and
determine with an accuracy of at least $10^{-12}$ the value of the critical
amplitude for ... | [
{
"created": "Wed, 8 Dec 2021 01:07:45 GMT",
"version": "v1"
}
] | 2022-04-13 | [
[
"Jiménez-Vázquez",
"Erik",
""
],
[
"Alcubierre",
"Miguel",
""
]
] | We study the critical gravitational collapse of a massless scalar field non-minimally coupled to gravity, using a quadratic coupling function with a strength parameter $\xi$. We concentrate on critical phenomena of type II, and determine with an accuracy of at least $10^{-12}$ the value of the critical amplitude for co... |
1006.2609 | Ujjal Debnath | Samarpita Bhattacharya and Ujjal Debnath | Brans-Dicke Theory and Thermodynamical Laws on Apparent and Event
Horizons | 6 pages, 2 figures | null | 10.1139/p11-072 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have described the Brans-Dicke theory of gravity and given a
particular solution by choosing a power law form of scalar field $\phi$ and
constant $\omega$. If we assume first law and entropy formula on apparent
horizon then we recover Friedmann equations. Next, assuming first law of
thermodynamics, t... | [
{
"created": "Mon, 14 Jun 2010 06:58:47 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Bhattacharya",
"Samarpita",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this work, we have described the Brans-Dicke theory of gravity and given a particular solution by choosing a power law form of scalar field $\phi$ and constant $\omega$. If we assume first law and entropy formula on apparent horizon then we recover Friedmann equations. Next, assuming first law of thermodynamics, the... |
1707.09309 | Ryuichi Fujita | Ryuichi Fujita, Norichika Sago, Hiroyuki Nakano | Note on Accuracy of the Post-Newtonian Approximation for Extreme-Mass
Ratio Inspirals: Retrograde Orbits | 10 pages, 3 figures | Class. Quantum Grav. 35 027001 (2018) | 10.1088/1361-6382/aa9ad5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The post-Newtonian approximation is useful to discuss gravitational waveforms
for binary inspirals. In this note, for retrograde circular orbits in the
equatorial plane, we discuss the region of validity of the post-Newtonian
approximation by using the gravitational energy flux derived numerically and
analytically in... | [
{
"created": "Fri, 28 Jul 2017 16:24:27 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2017 07:58:05 GMT",
"version": "v2"
}
] | 2017-12-22 | [
[
"Fujita",
"Ryuichi",
""
],
[
"Sago",
"Norichika",
""
],
[
"Nakano",
"Hiroyuki",
""
]
] | The post-Newtonian approximation is useful to discuss gravitational waveforms for binary inspirals. In this note, for retrograde circular orbits in the equatorial plane, we discuss the region of validity of the post-Newtonian approximation by using the gravitational energy flux derived numerically and analytically in t... |
gr-qc/9805088 | Bozhidar Zakhariev Iliev | Bozhidar Z. Iliev (Institute for Nuclear Research and Nuclear Energy,
Bulgarian Academy of Sciences, Sofia, Bulgaria) | Normal frames and the validity of the equivalence principle. III. The
case along smooth maps with separable points of self-intersection | 15 standard LaTeX 2e (11pt, A4) pages. The package amsfonts is
required | J.Phys.A31:1287-1296,1998 | 10.1088/0305-4470/31/4/016 | JINR Communication E5-92-543, Dubna, 1992 | gr-qc | null | The equivalence principle is treated on a mathematically rigorous base on
sufficiently general subsets of a differentiable manifold. This is carried out
using the basis of derivations of the tensor algebra over that manifold.
Necessary and/or sufficient conditions of existence, uniqueness, and
holonomicity of these b... | [
{
"created": "Fri, 22 May 1998 15:31:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Iliev",
"Bozhidar Z.",
"",
"Institute for Nuclear Research and Nuclear Energy,\n Bulgarian Academy of Sciences, Sofia, Bulgaria"
]
] | The equivalence principle is treated on a mathematically rigorous base on sufficiently general subsets of a differentiable manifold. This is carried out using the basis of derivations of the tensor algebra over that manifold. Necessary and/or sufficient conditions of existence, uniqueness, and holonomicity of these bas... |
gr-qc/9905062 | Maurizio Gasperini | M. Gasperini | Looking back in time beyond the big bang | 11 pages, Latex, four figures included using epsfig. Essay written
for the 1999 Awards of the Gravity Research Foundation (Wellesley Hills, Ma,
02481-0004), and selected for Honorable Mention. To appear in Mod. Phys.
Lett. A | Mod.Phys.Lett. A14 (1999) 1059-1066 | 10.1142/S0217732399001127 | BARI-TH/99-331 | gr-qc | null | String theory can (in principle) describe gravity at all curvature scales,
and can be applied to cosmology to look back in time beyond the Planck epoch.
The duality symmetries of string theory suggest a cosmological picture in which
the imprint of a primordial, pre-big bang phase could still be accessible to
present ... | [
{
"created": "Tue, 18 May 1999 13:35:55 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gasperini",
"M.",
""
]
] | String theory can (in principle) describe gravity at all curvature scales, and can be applied to cosmology to look back in time beyond the Planck epoch. The duality symmetries of string theory suggest a cosmological picture in which the imprint of a primordial, pre-big bang phase could still be accessible to present ob... |
1302.2646 | Paolo Pani | Caio F.B. Macedo, Paolo Pani, Vitor Cardoso, Luis C.B. Crispino | Into the lair: gravitational-wave signatures of dark matter | 17 pages, 6 figures. Abstract abridged. v2: Sections 1 and 2
improved. Version to be published in the ApJ | null | 10.1088/0004-637X/774/1/48 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nature and properties of dark matter (DM) are both outstanding issues in
physics. Besides clustering in halos, the universal character of gravity
implies that self-gravitating compact DM configurations might be spread
throughout the universe. The astrophysical signature of these objects may be
used to probe funda... | [
{
"created": "Mon, 11 Feb 2013 21:15:01 GMT",
"version": "v1"
},
{
"created": "Fri, 24 May 2013 14:52:50 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Macedo",
"Caio F. B.",
""
],
[
"Pani",
"Paolo",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Crispino",
"Luis C. B.",
""
]
] | The nature and properties of dark matter (DM) are both outstanding issues in physics. Besides clustering in halos, the universal character of gravity implies that self-gravitating compact DM configurations might be spread throughout the universe. The astrophysical signature of these objects may be used to probe fundame... |
2001.09082 | Alessandro Nagar | Alessandro Nagar, Gunnar Riemenschneider, Geraint Pratten, Piero
Rettegno and Francesco Messina | A multipolar effective one body waveform model for spin-aligned black
hole binaries | 45 pages, 21 figures, several changes with respect to the earlier
version. Matches published version | Phys. Rev. D 102, 024077 (2020) | 10.1103/PhysRevD.102.024077 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce \TEOBiResumSM{}, an improved version of the effective-one-body
(EOB) waveform model \TEOBResumS{} for spin-aligned, coalescing black hole
binaries, that includes subdominant gravitational waveform modes completed
through merger and ringdown. Beyond the dominant $(\ell,|m|)=(2,2)$ one, the
more robust mul... | [
{
"created": "Fri, 24 Jan 2020 16:44:24 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Sep 2020 09:53:17 GMT",
"version": "v2"
}
] | 2020-09-15 | [
[
"Nagar",
"Alessandro",
""
],
[
"Riemenschneider",
"Gunnar",
""
],
[
"Pratten",
"Geraint",
""
],
[
"Rettegno",
"Piero",
""
],
[
"Messina",
"Francesco",
""
]
] | We introduce \TEOBiResumSM{}, an improved version of the effective-one-body (EOB) waveform model \TEOBResumS{} for spin-aligned, coalescing black hole binaries, that includes subdominant gravitational waveform modes completed through merger and ringdown. Beyond the dominant $(\ell,|m|)=(2,2)$ one, the more robust multi... |
1001.5429 | Jose Luis Jaramillo | J.L. Jaramillo, E. Gourgoulhon | Mass and Angular Momentum in General Relativity | 41 pages. Notes based on the lecture given at the C.N.R.S. "School on
Mass" (June 2008) in Orleans, France. To appear as proceedings in the book
"Mass and Motion in General Relativity", eds. L. Blanchet, A. Spallicci and
B. Whiting. Some comments and references added. | null | 10.1007/978-90-481-3015-3_4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an introduction to mass and angular momentum in General
Relativity. After briefly reviewing energy-momentum for matter fields, first in
the flat Minkowski case (Special Relativity) and then in curved spacetimes with
or without symmetries, we focus on the discussion of energy-momentum for the
gravitational ... | [
{
"created": "Fri, 29 Jan 2010 16:26:37 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Apr 2010 08:30:01 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Jaramillo",
"J. L.",
""
],
[
"Gourgoulhon",
"E.",
""
]
] | We present an introduction to mass and angular momentum in General Relativity. After briefly reviewing energy-momentum for matter fields, first in the flat Minkowski case (Special Relativity) and then in curved spacetimes with or without symmetries, we focus on the discussion of energy-momentum for the gravitational fi... |
2004.05627 | Arunima Banerjee Dr. | K. Aditya, Indrani Banerjee, Arunima Banerjee and Soumitra SenGupta | Dynamical modelling of disc vertical structure in superthin galaxy `UGC
7321' in braneworld gravity: An MCMC study | 20 pages, 2 figures (Accepted for publication in MNRAS) | null | 10.1093/mnras/staa3104 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low surface brightness (LSBs) superthins constitute classic examples of very
late-type galaxies, with their disc dynamics strongly regulated by their dark
matter halos. In this work we consider a gravitational origin of dark matter in
the brane world scenario, where the higher dimensional Weyl stress term
projected o... | [
{
"created": "Sun, 12 Apr 2020 14:57:01 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Sep 2020 10:55:37 GMT",
"version": "v2"
}
] | 2020-10-21 | [
[
"Aditya",
"K.",
""
],
[
"Banerjee",
"Indrani",
""
],
[
"Banerjee",
"Arunima",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | Low surface brightness (LSBs) superthins constitute classic examples of very late-type galaxies, with their disc dynamics strongly regulated by their dark matter halos. In this work we consider a gravitational origin of dark matter in the brane world scenario, where the higher dimensional Weyl stress term projected ont... |
2001.03228 | Davide Fermi | Davide Fermi, Massimo Gengo, Livio Pizzocchero (Univ. di Milano) | Integrable scalar cosmologies with matter and curvature | 83 pages, 31 figures. In comparison with version v1, the exposition
of the results has been polished and some references have been added | Nucl. Phys. B 957 (2020), 115095 | 10.1016/j.nuclphysb.2020.115095 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that several integrable (i.e., exactly solvable) scalar cosmologies
considered by Fr\'e, Sagnotti and Sorin (Nuclear Physics \textbf{B 877}(3)
(2013), 1028--1106) can be generalized to include cases where the spatial
curvature is not zero and, besides a scalar field, matter or radiation are
present with an eq... | [
{
"created": "Thu, 9 Jan 2020 21:34:18 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Feb 2020 16:24:19 GMT",
"version": "v2"
}
] | 2020-07-03 | [
[
"Fermi",
"Davide",
"",
"Univ. di Milano"
],
[
"Gengo",
"Massimo",
"",
"Univ. di Milano"
],
[
"Pizzocchero",
"Livio",
"",
"Univ. di Milano"
]
] | We show that several integrable (i.e., exactly solvable) scalar cosmologies considered by Fr\'e, Sagnotti and Sorin (Nuclear Physics \textbf{B 877}(3) (2013), 1028--1106) can be generalized to include cases where the spatial curvature is not zero and, besides a scalar field, matter or radiation are present with an equa... |
0906.0926 | Luke Butcher | Luke M. Butcher, Michael Hobson, Anthony Lasenby | Bootstrapping gravity: a consistent approach to energy-momentum
self-coupling | 18 pages, RevTex; Published version | Phys.Rev.D80:084014,2009 | 10.1103/PhysRevD.80.084014 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is generally believed that coupling the graviton (a classical Fierz-Pauli
massless spin-2 field) to its own energy-momentum tensor successfully recreates
the dynamics of the Einstein field equations order by order; however the
validity of this idea has recently been brought into doubt [1]. Motivated by
this, we pr... | [
{
"created": "Thu, 4 Jun 2009 15:01:20 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 2009 11:45:46 GMT",
"version": "v2"
}
] | 2009-10-29 | [
[
"Butcher",
"Luke M.",
""
],
[
"Hobson",
"Michael",
""
],
[
"Lasenby",
"Anthony",
""
]
] | It is generally believed that coupling the graviton (a classical Fierz-Pauli massless spin-2 field) to its own energy-momentum tensor successfully recreates the dynamics of the Einstein field equations order by order; however the validity of this idea has recently been brought into doubt [1]. Motivated by this, we pres... |
2010.15202 | Ssohrab Borhanian | Ssohrab Borhanian | Gwbench: a novel Fisher information package for gravitational-wave
benchmarking | 18 pages, 6 figures, 4 tables | Class. Quantum Grav. 38 175014 (2021) | 10.1088/1361-6382/ac1618 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a new Python package, gwbench, implementing the well-established
Fisher information formalism as a fast and straightforward tool for the purpose
of gravitational-wave benchmarking, i.e. the estimation of signal-to-noise
ratios and measurement errors of gravitational waves observed by a network of
detectors... | [
{
"created": "Wed, 28 Oct 2020 19:52:19 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 2020 15:54:22 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Aug 2021 16:51:07 GMT",
"version": "v3"
}
] | 2021-08-31 | [
[
"Borhanian",
"Ssohrab",
""
]
] | We present a new Python package, gwbench, implementing the well-established Fisher information formalism as a fast and straightforward tool for the purpose of gravitational-wave benchmarking, i.e. the estimation of signal-to-noise ratios and measurement errors of gravitational waves observed by a network of detectors. ... |
1506.05014 | Minas Tsoukalas | Christos Charmousis and Minas Tsoukalas | On Lovelock galileons and black holes | 11 pages, minor corrections, references added, version accepted to
PRD | Phys. Rev. D 92, 104050 (2015) | 10.1103/PhysRevD.92.104050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a scalar-tensor version of Lovelock theory with a non trivial higher
order galileon term involving the coupling of the Lovelock two tensor with
derivatives of the scalar galileon field. For a static and spherically
symmetric spacetime we extend the Boulware-Deser solution to the presence of a
Galileon field.... | [
{
"created": "Tue, 16 Jun 2015 16:11:14 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Dec 2015 07:52:26 GMT",
"version": "v2"
}
] | 2015-12-09 | [
[
"Charmousis",
"Christos",
""
],
[
"Tsoukalas",
"Minas",
""
]
] | We study a scalar-tensor version of Lovelock theory with a non trivial higher order galileon term involving the coupling of the Lovelock two tensor with derivatives of the scalar galileon field. For a static and spherically symmetric spacetime we extend the Boulware-Deser solution to the presence of a Galileon field. T... |
0710.4345 | Spindel | Robert Brout, Serge Massar, Renaud Parentani, Philippe Spindel | A Primer for Black Hole Quantum Physics | An old review article on black hole evaporation and black hole
thermodynamics, put on the archive following popular demand, 178 pages, 21
figures (This text differs in slightly from the published version) | Phys.Rept.260:329-454,1995 | 10.1016/0370-1573(95)00008-5 | null | gr-qc hep-th | null | The mechanisms which give rise to Hawking radiation are revealed by analyzing
in detail pair production in the presence of horizons. In preparation for the
black hole problem, three preparatory problems are dwelt with at length: pair
production in an external electric field, thermalization of a uniformly
accelerated ... | [
{
"created": "Tue, 23 Oct 2007 21:09:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Brout",
"Robert",
""
],
[
"Massar",
"Serge",
""
],
[
"Parentani",
"Renaud",
""
],
[
"Spindel",
"Philippe",
""
]
] | The mechanisms which give rise to Hawking radiation are revealed by analyzing in detail pair production in the presence of horizons. In preparation for the black hole problem, three preparatory problems are dwelt with at length: pair production in an external electric field, thermalization of a uniformly accelerated de... |
1010.4004 | Ivan Agullo | I. Agullo, J. Navarro-Salas, G. J. Olmo, and L. Parker | Acceleration radiation, transition probabilities, and trans-Planckian
physics | 19 pages | New J.Phys.12:095017,2010 | 10.1088/1367-2630/12/9/095017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An important question in the derivation of the acceleration radiation, which
also arises in Hawking's derivation of black hole radiance, is the need to
invoke trans-Planckian physics for the quantum field that originates the
created quanta. We point out that this issue can be further clarified by
reconsidering the an... | [
{
"created": "Tue, 19 Oct 2010 18:46:59 GMT",
"version": "v1"
}
] | 2015-03-12 | [
[
"Agullo",
"I.",
""
],
[
"Navarro-Salas",
"J.",
""
],
[
"Olmo",
"G. J.",
""
],
[
"Parker",
"L.",
""
]
] | An important question in the derivation of the acceleration radiation, which also arises in Hawking's derivation of black hole radiance, is the need to invoke trans-Planckian physics for the quantum field that originates the created quanta. We point out that this issue can be further clarified by reconsidering the anal... |
2105.13896 | Qasem Exirifard | Qasem Exirifard, Ebrahim Karimi | Schr\"odinger equation in a general curved space-time geometry | 39 pages, 9 figures, Matches the published version | International Journal of Modern Physics D(2022) 225001 | 10.1142/S0218271822500183 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider relativistic quantum field theory in the presence of an external
electric potential in a general curved space-time geometry. We utilise Fermi
coordinates adapted to the time-like geodesic to describe the low-energy
physics in the laboratory and calculate the leading correction due to the
curvature of the ... | [
{
"created": "Wed, 26 May 2021 18:47:44 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 2021 15:08:39 GMT",
"version": "v2"
}
] | 2022-01-10 | [
[
"Exirifard",
"Qasem",
""
],
[
"Karimi",
"Ebrahim",
""
]
] | We consider relativistic quantum field theory in the presence of an external electric potential in a general curved space-time geometry. We utilise Fermi coordinates adapted to the time-like geodesic to describe the low-energy physics in the laboratory and calculate the leading correction due to the curvature of the sp... |
1208.5839 | Anil Zenginoglu C | An{\i}l Zengino\u{g}lu, Gaurav Khanna, Lior M. Burko | Intermediate behavior of Kerr tails | 16 pages | General Relativity and Gravitation 46, 1672 (2014) | 10.1007/s10714-014-1672-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The numerical investigation of wave propagation in the asymptotic domain of
Kerr spacetime has only recently been possible thanks to the construction of
suitable hyperboloidal coordinates. The asymptotics revealed an apparent puzzle
in the decay rates of scalar fields: the late-time rates seemed to depend on
whether ... | [
{
"created": "Wed, 29 Aug 2012 04:58:21 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2013 20:08:42 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Feb 2014 13:33:07 GMT",
"version": "v3"
}
] | 2014-02-18 | [
[
"Zenginoğlu",
"Anıl",
""
],
[
"Khanna",
"Gaurav",
""
],
[
"Burko",
"Lior M.",
""
]
] | The numerical investigation of wave propagation in the asymptotic domain of Kerr spacetime has only recently been possible thanks to the construction of suitable hyperboloidal coordinates. The asymptotics revealed an apparent puzzle in the decay rates of scalar fields: the late-time rates seemed to depend on whether fi... |
gr-qc/9906118 | Valery M. Koryukin | Valery Koryukin (Mari State Technical University) | Neutrinos of Universe and masses of particles | 11 pages, submitted to PANIC'99 | null | null | null | gr-qc | null | The detection and the research of the neutrinos background of
Universe are the attractive problems. This problems do not seem the
unpromising one in the case of the high neutrinos density that is necessary for
the explanation of the nucleons-antinucleons asymmetry of Universe. It was
offered before to use the low e... | [
{
"created": "Tue, 29 Jun 1999 11:46:57 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Koryukin",
"Valery",
"",
"Mari State Technical University"
]
] | The detection and the research of the neutrinos background of Universe are the attractive problems. This problems do not seem the unpromising one in the case of the high neutrinos density that is necessary for the explanation of the nucleons-antinucleons asymmetry of Universe. It was offered before to use the low energ... |
1602.04459 | Josef Schmidt | Ji\v{r}\'i Bi\v{c}\'ak, Josef Schmidt | Energy-momentum tensors in linearized Einstein's theory and massive
gravity: The question of uniqueness | 13 pages | Phys. Rev. D 93, 024009 (2016) | 10.1103/PhysRevD.93.024009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The question of the uniqueness of energy-momentum tensors in the linearized
general relativity and in the linear massive gravity is analyzed without using
variational techniques. We start from a natural ansatz for the form of the
tensor (for example, that it is a linear combination of the terms quadratic in
the first... | [
{
"created": "Sun, 14 Feb 2016 14:11:36 GMT",
"version": "v1"
}
] | 2016-02-16 | [
[
"Bičák",
"Jiří",
""
],
[
"Schmidt",
"Josef",
""
]
] | The question of the uniqueness of energy-momentum tensors in the linearized general relativity and in the linear massive gravity is analyzed without using variational techniques. We start from a natural ansatz for the form of the tensor (for example, that it is a linear combination of the terms quadratic in the first d... |
1203.4801 | Michel Miranda | Tonatiuh Matos, L. Arturo Urena-Lopez and Galaxia Miranda | Wormhole Cosmic Censorship | null | Gen. Rel. Grav. 48, (2016), 61 | 10.1007/s10714-016-2040-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the properties of a Kerr-like wormhole supported by phantom
matter, which is an exact solution of the Einstein-phantom field equations. It
is shown that the solution has a naked ring singularity which is unreachable to
null geodesics falling freely from the outside. Similarly to Roger Penrose's
cosmic cens... | [
{
"created": "Wed, 21 Mar 2012 18:58:16 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jun 2013 05:57:00 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Jul 2015 02:06:14 GMT",
"version": "v3"
},
{
"created": "Mon, 28 Mar 2016 21:23:32 GMT",
"version": "v4"
}
] | 2021-02-09 | [
[
"Matos",
"Tonatiuh",
""
],
[
"Urena-Lopez",
"L. Arturo",
""
],
[
"Miranda",
"Galaxia",
""
]
] | We analyze the properties of a Kerr-like wormhole supported by phantom matter, which is an exact solution of the Einstein-phantom field equations. It is shown that the solution has a naked ring singularity which is unreachable to null geodesics falling freely from the outside. Similarly to Roger Penrose's cosmic censor... |
1804.07740 | Mohammad Mehrafarin | Hamideh Balajani and Mohammad Mehrafarin | Berry phase of primordial scalar and tensor perturbations in
single-field inflationary models | null | Phys. Lett. A 382 (2018) 1524 | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the single-field slow-roll inflation, we derive the
Hamiltonian of the linear primordial scalar and tensor perturbations in the
form of time-dependent harmonic oscillator Hamiltonians. We find the invariant
operators of the resulting Hamiltonians and use their eigenstates to calculate
the adiabati... | [
{
"created": "Fri, 20 Apr 2018 17:35:09 GMT",
"version": "v1"
}
] | 2018-04-24 | [
[
"Balajani",
"Hamideh",
""
],
[
"Mehrafarin",
"Mohammad",
""
]
] | In the framework of the single-field slow-roll inflation, we derive the Hamiltonian of the linear primordial scalar and tensor perturbations in the form of time-dependent harmonic oscillator Hamiltonians. We find the invariant operators of the resulting Hamiltonians and use their eigenstates to calculate the adiabatic ... |
0904.3541 | Carlos O. Lousto | Carlos O. Lousto, Manuela Campanelli, Yosef Zlochower, Hiroyuki Nakano
(RIT) | Remnant Masses, Spins and Recoils from the Merger of Generic Black-Hole
Binaries | 15 pages, 2 figures. Rewritten and added new section. | Class.Quant.Grav.27:114006,2010 | 10.1088/0264-9381/27/11/114006 | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain empirical formulae for the final remnant black hole mass, spin, and
recoil velocity from merging black-hole binaries with arbitrary mass ratios and
spins. Our formulae are based on the mass ratio and spin dependence of the
post-Newtonian expressions for the instantaneous radiated energy, linear
momentum, an... | [
{
"created": "Wed, 22 Apr 2009 20:01:10 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2009 19:22:23 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Jan 2010 22:25:40 GMT",
"version": "v3"
},
{
"created": "Tue, 20 Apr 2010 21:28:28 GMT",
"version": "v4"
}
] | 2010-05-25 | [
[
"Lousto",
"Carlos O.",
"",
"RIT"
],
[
"Campanelli",
"Manuela",
"",
"RIT"
],
[
"Zlochower",
"Yosef",
"",
"RIT"
],
[
"Nakano",
"Hiroyuki",
"",
"RIT"
]
] | We obtain empirical formulae for the final remnant black hole mass, spin, and recoil velocity from merging black-hole binaries with arbitrary mass ratios and spins. Our formulae are based on the mass ratio and spin dependence of the post-Newtonian expressions for the instantaneous radiated energy, linear momentum, and ... |
2005.14211 | Jose' P. S. Lemos | Jos\'e P. S. Lemos, Diogo L. F. G. Silva | Maximal extension of the Schwarzschild metric: From
Painlev\'e-Gullstrand to Kruskal-Szekeres | 18 pages, 7 figures | Annals of Physics 430, 168497 (2021) | 10.1016/j.aop.2021.168497 | null | gr-qc astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find a specific coordinate system that goes from the Painlev\'e-Gullstrand
partial extension to the Kruskal-Szekeres maximal extension and thus exhibit
the maximal extension of the Schwarzschild metric in a unified picture. We do
this by adopting two time coordinates, one being the proper time of a
congruence of o... | [
{
"created": "Thu, 28 May 2020 18:00:25 GMT",
"version": "v1"
}
] | 2021-11-01 | [
[
"Lemos",
"José P. S.",
""
],
[
"Silva",
"Diogo L. F. G.",
""
]
] | We find a specific coordinate system that goes from the Painlev\'e-Gullstrand partial extension to the Kruskal-Szekeres maximal extension and thus exhibit the maximal extension of the Schwarzschild metric in a unified picture. We do this by adopting two time coordinates, one being the proper time of a congruence of out... |
0709.0299 | Latham Boyle | Latham Boyle, Michael Kesden and Samaya Nissanke | Binary black hole merger: symmetry and the spin expansion | 4 pages, 4 figures, matches Phys. Rev. Lett. version | Phys.Rev.Lett.100:151101,2008 | 10.1103/PhysRevLett.100.151101 | null | gr-qc astro-ph hep-ph hep-th | null | We regard binary black hole (BBH) merger as a map from a simple initial state
(two Kerr black holes, with dimensionless spins {\bf a} and {\bf b}) to a
simple final state (a Kerr black hole with mass m, dimensionless spin {\bf s},
and kick velocity {\bf k}). By expanding this map around {\bf a} = {\bf b} = 0
and appl... | [
{
"created": "Tue, 4 Sep 2007 19:02:29 GMT",
"version": "v1"
},
{
"created": "Fri, 9 May 2008 02:52:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Boyle",
"Latham",
""
],
[
"Kesden",
"Michael",
""
],
[
"Nissanke",
"Samaya",
""
]
] | We regard binary black hole (BBH) merger as a map from a simple initial state (two Kerr black holes, with dimensionless spins {\bf a} and {\bf b}) to a simple final state (a Kerr black hole with mass m, dimensionless spin {\bf s}, and kick velocity {\bf k}). By expanding this map around {\bf a} = {\bf b} = 0 and applyi... |
1210.1449 | Abraham Harte | Abraham I. Harte | Strong lensing, plane gravitational waves and transient flashes | 32 pages, 8 figures, fixed typos and slightly added to some
explanations | null | 10.1088/0264-9381/30/7/075011 | AEI-2012-106 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Plane-symmetric gravitational waves are considered as gravitational lenses.
Numbers of images, frequency shifts, mutual angles, and image distortion
parameters are computed exactly in essentially all non-singular plane wave
spacetimes. For a fixed observation event in a particular plane wave spacetime,
the number of ... | [
{
"created": "Thu, 4 Oct 2012 14:10:14 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Oct 2012 16:12:40 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Harte",
"Abraham I.",
""
]
] | Plane-symmetric gravitational waves are considered as gravitational lenses. Numbers of images, frequency shifts, mutual angles, and image distortion parameters are computed exactly in essentially all non-singular plane wave spacetimes. For a fixed observation event in a particular plane wave spacetime, the number of im... |
2308.09826 | John Friedman | John L. Friedman | Notes on Gravitational Physics | 371 pages. This updated version includes a chapter on cosmology as
well as a number of revisions and corrections | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-sa/4.0/ | These notes are self-contained, with the first 7 chapters used in a
one-semester course with recommended texts by Wald, by Misner, Thorne and
Wheeler, and by Schutz. In its treatment of topics covered in these standard
texts, the presentation here typically includes steps skipped in Wald or MTW.
Treatments of gravita... | [
{
"created": "Fri, 18 Aug 2023 21:31:53 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2024 15:56:45 GMT",
"version": "v2"
}
] | 2024-05-22 | [
[
"Friedman",
"John L.",
""
]
] | These notes are self-contained, with the first 7 chapters used in a one-semester course with recommended texts by Wald, by Misner, Thorne and Wheeler, and by Schutz. In its treatment of topics covered in these standard texts, the presentation here typically includes steps skipped in Wald or MTW. Treatments of gravitati... |
1708.07851 | Andreas Sch\"arer | Manuel Hohmann, Andreas Sch\"arer | Post-Newtonian parameters $\gamma$ and $\beta$ of scalar-tensor gravity
for a homogeneous gravitating sphere | 35 pages, 5 figures | Phys. Rev. D 96, 104026 (2017) | 10.1103/PhysRevD.96.104026 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the parameters $\gamma$ and $\beta$ in the parametrized
post-Newtonian (PPN) formalism for scalar-tensor gravity (STG) with an
arbitrary potential, under the assumption that the source matter is given by a
non-rotating sphere of constant density, pressure and internal energy. For our
calculation we write... | [
{
"created": "Fri, 25 Aug 2017 18:15:12 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2017 15:56:37 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Hohmann",
"Manuel",
""
],
[
"Schärer",
"Andreas",
""
]
] | We calculate the parameters $\gamma$ and $\beta$ in the parametrized post-Newtonian (PPN) formalism for scalar-tensor gravity (STG) with an arbitrary potential, under the assumption that the source matter is given by a non-rotating sphere of constant density, pressure and internal energy. For our calculation we write t... |
gr-qc/0409023 | Sayan Kar | Supratik Pal, Somnath Bharadwaj and Sayan Kar (IIT Kharagpur, India) | Can extra dimensional effects replace dark matter ? | 10 pages, no figures, RevTex4 | Phys.Lett. B609 (2005) 194-199 | 10.1016/j.physletb.2005.01.043 | null | gr-qc astro-ph hep-th | null | In the braneworld scenario, the four dimensional effective Einstein equation
has extra terms which arise from the embedding of the 3-brane in the bulk. We
show that in this modified theory of gravity, it is possible to model
observations of galaxy rotation curves and the X-ray profiles of clusters of
galaxies, withou... | [
{
"created": "Mon, 6 Sep 2004 09:51:36 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Pal",
"Supratik",
"",
"IIT Kharagpur, India"
],
[
"Bharadwaj",
"Somnath",
"",
"IIT Kharagpur, India"
],
[
"Kar",
"Sayan",
"",
"IIT Kharagpur, India"
]
] | In the braneworld scenario, the four dimensional effective Einstein equation has extra terms which arise from the embedding of the 3-brane in the bulk. We show that in this modified theory of gravity, it is possible to model observations of galaxy rotation curves and the X-ray profiles of clusters of galaxies, without ... |
1407.7742 | Taeyoon Moon | Yun Soo Myung and Taeyoon Moon | Cosmological singleton gravity theory and dS/LCFT correspondence | 1+18 pages, no figures, published version | JHEP10(2014)137 | 10.1007/JHEP10(2014)137 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of cosmological perturbations generated during de
Sitter inflation in the singleton gravity theory. This theory is composed of a
dipole ghost pair in addition to tensor. We obtain the singleton power spectra
which show that the de Sitter/logarithmic conformal field theory (dS/LCFT)
corresponden... | [
{
"created": "Tue, 29 Jul 2014 14:42:57 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Oct 2014 02:26:24 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Myung",
"Yun Soo",
""
],
[
"Moon",
"Taeyoon",
""
]
] | We study the evolution of cosmological perturbations generated during de Sitter inflation in the singleton gravity theory. This theory is composed of a dipole ghost pair in addition to tensor. We obtain the singleton power spectra which show that the de Sitter/logarithmic conformal field theory (dS/LCFT) correspondence... |
0811.4316 | Oleg Zaslavskii | Naresh Dadhich and Oleg B. Zaslavskii | Focusing versus defocusing properties of truly naked black holes | 16 pages. To appear in IJMP D | Int.J.Mod.Phys.D18:1073-1084,2009 | 10.1142/S0218271809014959 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of the congruence of null geodesics propagating near
the so-called truly naked horizons (TNH) - objects having finite Kretschmann
scalar but with diverging tidal acceleration for freely falling observers. The
expansion of outgoing rays near the future horizon always tends to vanish for
the non... | [
{
"created": "Wed, 26 Nov 2008 14:06:15 GMT",
"version": "v1"
}
] | 2009-08-25 | [
[
"Dadhich",
"Naresh",
""
],
[
"Zaslavskii",
"Oleg B.",
""
]
] | We study the properties of the congruence of null geodesics propagating near the so-called truly naked horizons (TNH) - objects having finite Kretschmann scalar but with diverging tidal acceleration for freely falling observers. The expansion of outgoing rays near the future horizon always tends to vanish for the non-e... |
2010.13518 | S. Q. Wu | Di Wu, Shuang-Qing Wu, Puxun Wu, Hongwei Yu | Aspects of the dyonic Kerr-Sen-AdS$_4$ black hole and its ultraspinning
version | 12 pages,2 figures, revtex4-1.cls. Title changed; six references
newly-added | Phys. Rev. D 103, 044014 (2021) | 10.1103/PhysRevD.103.044014 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We explore some (especially, thermodynamical) properties of the dyonic
Kerr-Sen-AdS$_4$ black hole and its ultraspinning counterpart, and check
whether or not both black holes satisfy the first law and Bekenstein-Smarr mass
formulas. To this end, new Christodoulou-Ruffini-like squared-mass formulae for
the usual dyon... | [
{
"created": "Fri, 23 Oct 2020 01:42:40 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Dec 2020 05:45:29 GMT",
"version": "v2"
}
] | 2021-02-16 | [
[
"Wu",
"Di",
""
],
[
"Wu",
"Shuang-Qing",
""
],
[
"Wu",
"Puxun",
""
],
[
"Yu",
"Hongwei",
""
]
] | We explore some (especially, thermodynamical) properties of the dyonic Kerr-Sen-AdS$_4$ black hole and its ultraspinning counterpart, and check whether or not both black holes satisfy the first law and Bekenstein-Smarr mass formulas. To this end, new Christodoulou-Ruffini-like squared-mass formulae for the usual dyonic... |
1409.4918 | Marcelo Disconzi | Marcelo M. Disconzi, Thomas W. Kephart, Robert J. Scherrer | A New Approach to Cosmological Bulk Viscosity | Text and references expanded. To appear in Physical Review D | Phys. Rev. D 91, 043532 (2015) | 10.1103/PhysRevD.91.043532 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the cosmological consequences of an alternative to the standard
expression for bulk viscosity, one which was proposed to avoid the propagation
of superluminal signals without the necessity of extending the space of
variables of the theory. The Friedmann equation is derived for this case, along
with an expr... | [
{
"created": "Wed, 17 Sep 2014 09:33:53 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2015 14:34:35 GMT",
"version": "v2"
}
] | 2016-04-08 | [
[
"Disconzi",
"Marcelo M.",
""
],
[
"Kephart",
"Thomas W.",
""
],
[
"Scherrer",
"Robert J.",
""
]
] | We examine the cosmological consequences of an alternative to the standard expression for bulk viscosity, one which was proposed to avoid the propagation of superluminal signals without the necessity of extending the space of variables of the theory. The Friedmann equation is derived for this case, along with an expres... |
1801.03382 | Shaoqi Hou | Yungui Gong, Shaoqi Hou, Dicong Liang, Eleftherios Papantonopoulos | Gravitational waves in Einstein-{\ae}ther and generalized TeVeS theory
after GW170817 | 33 pages, 7 figures | Phys. Rev. D 97, 084040 (2018) | 10.1103/PhysRevD.97.084040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we discuss the polarization contents of Einstein-\ae ther
theory and the generalized tensor-vector-scalar (TeVeS) theory, as both
theories have a normalized timelike vector field. We derive the linearized
equations of motion around the flat spacetime background using the
gauge-invariant variables to eas... | [
{
"created": "Wed, 10 Jan 2018 14:08:36 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Mar 2018 12:10:16 GMT",
"version": "v2"
},
{
"created": "Sun, 15 Apr 2018 13:21:49 GMT",
"version": "v3"
}
] | 2018-04-25 | [
[
"Gong",
"Yungui",
""
],
[
"Hou",
"Shaoqi",
""
],
[
"Liang",
"Dicong",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
]
] | In this work, we discuss the polarization contents of Einstein-\ae ther theory and the generalized tensor-vector-scalar (TeVeS) theory, as both theories have a normalized timelike vector field. We derive the linearized equations of motion around the flat spacetime background using the gauge-invariant variables to easil... |
1508.05120 | Christian Boehmer | Sebastian Bahamonde, Christian G. Boehmer, Matthew Wright | Modified teleparallel theories of gravity | 9 pages, 1 figure; some typos fixed, slightly improved notation | Phys. Rev. D 92, 104042 (2015) | 10.1103/PhysRevD.92.104042 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate modified theories of gravity in the context of teleparallel
geometries. It is well known that modified gravity models based on the torsion
scalar are not invariant under local Lorentz transformations while
modifications based on the Ricci scalar are. This motivates the study of a
model depending on the... | [
{
"created": "Thu, 20 Aug 2015 20:50:36 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Nov 2015 10:29:12 GMT",
"version": "v2"
}
] | 2015-11-30 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Boehmer",
"Christian G.",
""
],
[
"Wright",
"Matthew",
""
]
] | We investigate modified theories of gravity in the context of teleparallel geometries. It is well known that modified gravity models based on the torsion scalar are not invariant under local Lorentz transformations while modifications based on the Ricci scalar are. This motivates the study of a model depending on the t... |
gr-qc/0112077 | Christos G. Tsagas | Christos G Tsagas (Univ. of Portsmouth/Univ. of Cape Town) | Geometrical Aspects of Cosmic Magnetic Fields | To appear in proceedings of the 2nd Hellenic Cosmology Workshop,
Athens 2001 (Kluwer-ASSL series) | null | 10.1007/978-94-010-0622-4_4 | null | gr-qc astro-ph | null | We discuss how the vector nature of magnetic fields, and the geometrical
interpretation of gravity introduced by general relativity, lead to a special
coupling between magnetism and spacetime curvature. This magneto-geometrical
interaction effectively transfers the tension properties of the field into the
spacetime f... | [
{
"created": "Sat, 29 Dec 2001 12:16:06 GMT",
"version": "v1"
}
] | 2017-01-25 | [
[
"Tsagas",
"Christos G",
"",
"Univ. of Portsmouth/Univ. of Cape Town"
]
] | We discuss how the vector nature of magnetic fields, and the geometrical interpretation of gravity introduced by general relativity, lead to a special coupling between magnetism and spacetime curvature. This magneto-geometrical interaction effectively transfers the tension properties of the field into the spacetime fab... |
2304.12407 | Guillermo Palma Prof. Dr. | Norman Cruz, Gabriel Gomez, Esteban Gonzalez, Guillermo Palma and
Angel Rincon | Exploring Models of Running Vacuum Energy with Viscous Dark Matter from
a Dynamical System Perspective | 26 pages and 13 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Running vacuum models and viscous dark matter scenarios beyond perfect fluid
idealization are two appealing theoretical strategies that have been separately
studied as alternatives to solve some problems rooted in the $\Lambda$CDM
cosmological model. In this paper, we combine these two notions in a single
cosmologica... | [
{
"created": "Mon, 24 Apr 2023 19:38:04 GMT",
"version": "v1"
}
] | 2023-04-26 | [
[
"Cruz",
"Norman",
""
],
[
"Gomez",
"Gabriel",
""
],
[
"Gonzalez",
"Esteban",
""
],
[
"Palma",
"Guillermo",
""
],
[
"Rincon",
"Angel",
""
]
] | Running vacuum models and viscous dark matter scenarios beyond perfect fluid idealization are two appealing theoretical strategies that have been separately studied as alternatives to solve some problems rooted in the $\Lambda$CDM cosmological model. In this paper, we combine these two notions in a single cosmological ... |
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