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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1206.5029 | Gil de Oliveira-Neto | G. Oliveira-Neto, G. A. Monerat, E. V. Corr\^ea Silva, C. Neves and L.
G. Ferreira Filho | Quantum noncomutativity in quantum cosmology | 7 pages and no figures. Modifications in the introduction and
references | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we study the noncommutative version of a quantum
cosmology model. The model has a Friedmann-Robertson-Walker geometry, the
matter content is a radiative perfect fluid and the spatial sections have
positive constant curvatures. We work in the Schutz's variational formalism. We
quantize the model a... | [
{
"created": "Thu, 21 Jun 2012 22:40:58 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Oct 2014 18:21:33 GMT",
"version": "v2"
},
{
"created": "Tue, 3 May 2016 21:52:28 GMT",
"version": "v3"
}
] | 2016-05-05 | [
[
"Oliveira-Neto",
"G.",
""
],
[
"Monerat",
"G. A.",
""
],
[
"Silva",
"E. V. Corrêa",
""
],
[
"Neves",
"C.",
""
],
[
"Filho",
"L. G. Ferreira",
""
]
] | In the present work, we study the noncommutative version of a quantum cosmology model. The model has a Friedmann-Robertson-Walker geometry, the matter content is a radiative perfect fluid and the spatial sections have positive constant curvatures. We work in the Schutz's variational formalism. We quantize the model and... |
gr-qc/0211001 | Matt Visser | Nicolas Yunes (Washington University in Saint Louis) and Matt Visser
(Victoria University of Wellington) | Power laws, scale invariance, and generalized Frobenius series:
Applications to Newtonian and TOV stars near criticality | 35 pages; IJMPA style file | Int.J.Mod.Phys. A18 (2003) 3433-3468 | 10.1142/S0217751X03013892 | null | gr-qc | null | We present a self-contained formalism for analyzing scale invariant
differential equations. We first cast the scale invariant model into its
equidimensional and autonomous forms, find its fixed points, and then obtain
power-law background solutions. After linearizing about these fixed points, we
find a second lineari... | [
{
"created": "Thu, 31 Oct 2002 23:18:35 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Yunes",
"Nicolas",
"",
"Washington University in Saint Louis"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | We present a self-contained formalism for analyzing scale invariant differential equations. We first cast the scale invariant model into its equidimensional and autonomous forms, find its fixed points, and then obtain power-law background solutions. After linearizing about these fixed points, we find a second linearize... |
1609.05636 | Tiberiu Harko | Bogdan D\u{a}nil\u{a}, Tiberiu Harko, Man Kwong Mak, Praiboon
Pantaragphong, Sorin Sabau | Jacobi stability analysis of scalar field models with minimal coupling
to gravity in a cosmological background | 24 pages, 14 figures, accepted for publication in Advances in High
Energy Physics, special issue "Dark Physics in the Early Universe" | Advances in High Energy Physics, 2016, 7521464 (2016) | 10.1155/2016/7521464 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform the study of the stability of the cosmological scalar field
models, by using the Jacobi stability analysis, or the Kosambi-Cartan-Chern
(KCC) theory. In the KCC approach we describe the time evolution of the scalar
field cosmologies in geometric terms, by performing a "second geometrization",
by considerin... | [
{
"created": "Mon, 19 Sep 2016 08:46:17 GMT",
"version": "v1"
}
] | 2016-10-31 | [
[
"Dănilă",
"Bogdan",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Mak",
"Man Kwong",
""
],
[
"Pantaragphong",
"Praiboon",
""
],
[
"Sabau",
"Sorin",
""
]
] | We perform the study of the stability of the cosmological scalar field models, by using the Jacobi stability analysis, or the Kosambi-Cartan-Chern (KCC) theory. In the KCC approach we describe the time evolution of the scalar field cosmologies in geometric terms, by performing a "second geometrization", by considering ... |
2305.15503 | Jiangtao Wang | B. Q. Wang, S. R. Wu | Echoes of the regularized dilatonic black hole | Lack of graphical analysis | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In present work, the evolution of scalar field and electromagnetic field
under the background of the regularized dilatonic black bounces spacetimes are
investigated, we obtain an obvious echoes signal which appropriately reports
the properties of regularized dilatonic black bounces spacetimes and disclose
the physica... | [
{
"created": "Wed, 24 May 2023 18:44:45 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2024 12:26:47 GMT",
"version": "v2"
}
] | 2024-01-30 | [
[
"Wang",
"B. Q.",
""
],
[
"Wu",
"S. R.",
""
]
] | In present work, the evolution of scalar field and electromagnetic field under the background of the regularized dilatonic black bounces spacetimes are investigated, we obtain an obvious echoes signal which appropriately reports the properties of regularized dilatonic black bounces spacetimes and disclose the physical ... |
2310.19706 | Zachary Nasipak | Zachary Nasipak | BHPWAVE: An adiabatic gravitational waveform model for compact objects
undergoing quasi-circular inspirals into rotating massive black holes | 24 pages, 17 figures, 2 tables | Phys. Rev. D 109, 044020 (2024) | 10.1103/PhysRevD.109.044020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present {bhpwave}: a new Python-based, open-source tool for generating the
gravitational waveforms of stellar-mass compact objects undergoing
quasi-circular inspirals into rotating massive black holes. These binaries,
known as extreme-mass-ratio inspirals (EMRIs), are exciting mHz gravitational
wave sources for fu... | [
{
"created": "Mon, 30 Oct 2023 16:33:36 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Mar 2024 01:45:23 GMT",
"version": "v2"
}
] | 2024-03-08 | [
[
"Nasipak",
"Zachary",
""
]
] | We present {bhpwave}: a new Python-based, open-source tool for generating the gravitational waveforms of stellar-mass compact objects undergoing quasi-circular inspirals into rotating massive black holes. These binaries, known as extreme-mass-ratio inspirals (EMRIs), are exciting mHz gravitational wave sources for futu... |
gr-qc/9609009 | Kim Sang Pyo | Sang Pyo Kim | Coherent State Representation of Semiclassical Quantum Gravity | 10 Pages, ReVTeX, No figures | J.Korean Phys.Soc.30:349,1997 | null | SNUTP 96-089, KNUTH-34 | gr-qc | null | We elaborate the recently introduced asymptotically exact semiclassical
quantum gravity derived from the Wheeler-DeWitt equation by finding a
particular coherent state representation of a quantum scalar field in which the
back-reaction of the scalar field Hamiltonian exactly gives rise to the
classical one. In this c... | [
{
"created": "Mon, 2 Sep 1996 07:46:01 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Kim",
"Sang Pyo",
""
]
] | We elaborate the recently introduced asymptotically exact semiclassical quantum gravity derived from the Wheeler-DeWitt equation by finding a particular coherent state representation of a quantum scalar field in which the back-reaction of the scalar field Hamiltonian exactly gives rise to the classical one. In this coh... |
1004.4885 | Philippe G. LeFloch | Florian Beyer and Philippe G. LeFloch | Second-order hyperbolic Fuchsian systems. General theory | 32 pages. A shortened version of the material presented in this
preprint is published in: F. Beyer and P.G. LeFloch, Second-order hyperbolic
Fuchsian systems and applications, Class. Quantum Grav. 27 (2010), 245012 | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a class of singular partial differential equations, the
second-order hyperbolic Fuchsian systems, and we investigate the associated
initial value problem when data are imposed on the singularity. First of all,
we analyze a class of equations in which hyperbolicity is not assumed and we
construct asymptot... | [
{
"created": "Tue, 27 Apr 2010 18:58:35 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2011 20:46:26 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Beyer",
"Florian",
""
],
[
"LeFloch",
"Philippe G.",
""
]
] | We introduce a class of singular partial differential equations, the second-order hyperbolic Fuchsian systems, and we investigate the associated initial value problem when data are imposed on the singularity. First of all, we analyze a class of equations in which hyperbolicity is not assumed and we construct asymptotic... |
1204.0872 | Wei-Tou Ni | Wei-Tou Ni, Hsien-Hao Mei and Shan-Jyun Wu | Foundations of Classical Electrodynamics, Equivalence Principle and
Cosmic Interactions: A Short Exposition and an Update | 15 pages, 2 figures, 2 tables. Plenary talk at First LeCosPA
Symposium: Towards Ultimate Understanding of the Universe(LeCosPA2012),
National Taiwan University, Taipei, ROC, February 6-9, 2012 | Modern Physics Letters A, Vol. 28, No. 3 (2013) 1340013 | 10.1142/S0217732313400130 | null | gr-qc hep-ph physics.class-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We look at the foundations of electromagnetism in this 1st LeCosPA Symposium.
For doing this, after some review (constraints on photon mass etc.), we use two
approaches. The first one is to formulate a Parametrized Post-Maxwellian (PPM)
framework to include QED corrections and a pseudoscalar photon interaction. PPM
f... | [
{
"created": "Wed, 4 Apr 2012 06:22:46 GMT",
"version": "v1"
}
] | 2013-01-11 | [
[
"Ni",
"Wei-Tou",
""
],
[
"Mei",
"Hsien-Hao",
""
],
[
"Wu",
"Shan-Jyun",
""
]
] | We look at the foundations of electromagnetism in this 1st LeCosPA Symposium. For doing this, after some review (constraints on photon mass etc.), we use two approaches. The first one is to formulate a Parametrized Post-Maxwellian (PPM) framework to include QED corrections and a pseudoscalar photon interaction. PPM fra... |
2301.07250 | Rodrigo Gonzalez Quaglia | R. Gonzalez Quaglia | An early and late times dynamical analysis of a scale invariant
gravitational model with a vector scalar interaction: the isotropic case | 26 pages, 8 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar fields are widely and popularly used in cosmology in order to explain
different phenomena among which, inflation and dark energy are two of the most
popular ones. Specifically, in recent years, scale invariance in the
gravitational sector has gained interest due to its simplicity, ability to
model inflation an... | [
{
"created": "Wed, 18 Jan 2023 01:23:58 GMT",
"version": "v1"
}
] | 2023-01-19 | [
[
"Quaglia",
"R. Gonzalez",
""
]
] | Scalar fields are widely and popularly used in cosmology in order to explain different phenomena among which, inflation and dark energy are two of the most popular ones. Specifically, in recent years, scale invariance in the gravitational sector has gained interest due to its simplicity, ability to model inflation and ... |
gr-qc/9711016 | Steve Brandt | S. R. Brandt, K. Camarda, E. Seidel | Three Dimensional Distorted Black Holes: Initial Data and Evolution | 3 pages, 2 postscript figures, LaTeX, uses mprocl.sty (available at
http://shemesh.fiz.huji.ac.il/MG8/submission.html) To appear in the
proceedings of the Marcel Grossmann 8 (Jerusalem, 1997) | null | null | null | gr-qc | null | We present a new class of 3D black hole initial data sets for numerical
relativity. These data sets go beyond the axisymmetric, ``gravity wave plus
rotating black hole'' single black hole data sets by creating a dynamic,
distorted hole with adjustable distortion parameters in 3D. These data sets
extend our existing t... | [
{
"created": "Thu, 6 Nov 1997 07:40:05 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 1998 08:25:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Brandt",
"S. R.",
""
],
[
"Camarda",
"K.",
""
],
[
"Seidel",
"E.",
""
]
] | We present a new class of 3D black hole initial data sets for numerical relativity. These data sets go beyond the axisymmetric, ``gravity wave plus rotating black hole'' single black hole data sets by creating a dynamic, distorted hole with adjustable distortion parameters in 3D. These data sets extend our existing tes... |
1212.4847 | Istvan Racz | Andr\'as L\'aszl\'o, Istv\'an R\'acz | Superradiance or total reflection? | 8 pages, 6 figures, contribution to the proceedings of the conference
on Relativity and Gravitation: 100 Years after Einstein in Prague | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical evolution of massless scalar fields on Kerr background is studied.
The initial data specifications are chosen to have compact support separated
from the ergoregion and to yield nearly monochromatic incident wave packets.
The initial data is also tuned to maximize the effect of superradiance.
Evidences are s... | [
{
"created": "Wed, 19 Dec 2012 21:01:07 GMT",
"version": "v1"
}
] | 2012-12-21 | [
[
"László",
"András",
""
],
[
"Rácz",
"István",
""
]
] | Numerical evolution of massless scalar fields on Kerr background is studied. The initial data specifications are chosen to have compact support separated from the ergoregion and to yield nearly monochromatic incident wave packets. The initial data is also tuned to maximize the effect of superradiance. Evidences are sho... |
2011.14760 | Maryam Roushan | M. Roushan and K. Nozari | Thermostatistics with an Invariant Infrared Cutoff | null | The European Physical Journal C (2020) 1-12 | 10.1140/epjc/s10052-020-8378-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum gravitational effects may affect the large scale dynamics of the
universe. Phenomenologically, quantum gravitational effect at large distances
can be encoded in an extended uncertainty principle that admits a minimal
measurable momentum/energy or a maximal length. This maximal length can be
considered as the ... | [
{
"created": "Mon, 30 Nov 2020 13:15:43 GMT",
"version": "v1"
}
] | 2020-12-01 | [
[
"Roushan",
"M.",
""
],
[
"Nozari",
"K.",
""
]
] | Quantum gravitational effects may affect the large scale dynamics of the universe. Phenomenologically, quantum gravitational effect at large distances can be encoded in an extended uncertainty principle that admits a minimal measurable momentum/energy or a maximal length. This maximal length can be considered as the si... |
1404.4025 | Dipongkar Talukder | Dipongkar Talukder, Eric Thrane, Sukanta Bose, and Tania Regimbau | Measuring neutron-star ellipticity with measurements of the stochastic
gravitational-wave background | null | Phys. Rev. D 89, 123008 (2014) | 10.1103/PhysRevD.89.123008 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Galactic neutron stars are a promising source of gravitational waves in the
analysis band of detectors such as LIGO and Virgo. Previous searches for
gravitational waves from neutron stars have focused on the detection of
individual neutron stars, which are either nearby or highly non-spherical. Here
we consider the s... | [
{
"created": "Tue, 15 Apr 2014 19:25:34 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 2014 21:07:24 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jun 2014 17:46:40 GMT",
"version": "v3"
}
] | 2014-06-25 | [
[
"Talukder",
"Dipongkar",
""
],
[
"Thrane",
"Eric",
""
],
[
"Bose",
"Sukanta",
""
],
[
"Regimbau",
"Tania",
""
]
] | Galactic neutron stars are a promising source of gravitational waves in the analysis band of detectors such as LIGO and Virgo. Previous searches for gravitational waves from neutron stars have focused on the detection of individual neutron stars, which are either nearby or highly non-spherical. Here we consider the sto... |
1505.06058 | Sanjeev S. Seahra | Jack Gegenberg, Shohreh Rahmati, Sanjeev S. Seahra | Infrared modification of gravity from conformal symmetry | 7 pages. Expanded presentation and some changes of notation. Matches
version published in PRD | Phys. Rev. D 93, 064025 (2016) | 10.1103/PhysRevD.93.064025 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider a gauge theory of gravity in which the gauge group is the
conformal group SO(4,2) and the action is of the Yang-Mills form, quadratic in
the curvature. The resulting gravitational theory exhibits local conformal
symmetry and reduces to Weyl-squared gravity under certain conditions. When the
theory is li... | [
{
"created": "Fri, 22 May 2015 13:04:55 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Apr 2016 17:24:03 GMT",
"version": "v2"
}
] | 2016-04-07 | [
[
"Gegenberg",
"Jack",
""
],
[
"Rahmati",
"Shohreh",
""
],
[
"Seahra",
"Sanjeev S.",
""
]
] | We reconsider a gauge theory of gravity in which the gauge group is the conformal group SO(4,2) and the action is of the Yang-Mills form, quadratic in the curvature. The resulting gravitational theory exhibits local conformal symmetry and reduces to Weyl-squared gravity under certain conditions. When the theory is line... |
1606.00214 | Bijan Saha Dr. | Bijan Saha | Nonlinear Spinor field in isotropic space-time and dark energy models | 21 pages, 20 figures | The European Phys. J Plus 131: 242 (2016) | 10.1140/epjp/i2016-16242-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the scope of isotropic FRW cosmological model the role of nonlinear
spinor field in the evolution of the Universe is studied. It is found that
unlike in anisotropic cosmological models in the present case the spinor field
does not possess nontrivial non-diagonal components of energy-momentum tensor,
consequent... | [
{
"created": "Wed, 1 Jun 2016 10:51:07 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2016 12:26:58 GMT",
"version": "v2"
}
] | 2016-07-27 | [
[
"Saha",
"Bijan",
""
]
] | Within the scope of isotropic FRW cosmological model the role of nonlinear spinor field in the evolution of the Universe is studied. It is found that unlike in anisotropic cosmological models in the present case the spinor field does not possess nontrivial non-diagonal components of energy-momentum tensor, consequently... |
2405.20193 | Martin Bojowald | Kallan Berglund, Martin Bojowald, Aurora Colter, Manuel Diaz | Space-time superpositions as fluctuating geometries | 33 pages | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superpositions of black holes can be described geometrically using a combined
canonical formulation for space-time and quantum states. A previously
introduced black-hole model that includes quantum fluctuations of metric
components is shown here to give full access to the corresponding space-time
geometry of weak-fie... | [
{
"created": "Thu, 30 May 2024 15:58:00 GMT",
"version": "v1"
}
] | 2024-05-31 | [
[
"Berglund",
"Kallan",
""
],
[
"Bojowald",
"Martin",
""
],
[
"Colter",
"Aurora",
""
],
[
"Diaz",
"Manuel",
""
]
] | Superpositions of black holes can be described geometrically using a combined canonical formulation for space-time and quantum states. A previously introduced black-hole model that includes quantum fluctuations of metric components is shown here to give full access to the corresponding space-time geometry of weak-field... |
2406.09006 | Dhanvarsh Annamalai S. R. | Dhanvarsh Annamalai and Akshat Pandey | Tunneling of Hawking Radiation in Starobinsky-Bel-Robinson gravity | This work is accepted for publication in Gravitation and Cosmology,
Vol. 30 , Issue 4 | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We examine Hawking radiation for a Schwarszchild-type black hole in
Starobinsky Bel Robinson (SBR) gravity and calculate the corrected Hawking
Temperature using the tunnelling method. We then discuss the deviation of our
Hawking temperature from the standard Schwarszchild result. We relate the
corrections to the Hawk... | [
{
"created": "Thu, 13 Jun 2024 11:19:35 GMT",
"version": "v1"
}
] | 2024-06-14 | [
[
"Annamalai",
"Dhanvarsh",
""
],
[
"Pandey",
"Akshat",
""
]
] | We examine Hawking radiation for a Schwarszchild-type black hole in Starobinsky Bel Robinson (SBR) gravity and calculate the corrected Hawking Temperature using the tunnelling method. We then discuss the deviation of our Hawking temperature from the standard Schwarszchild result. We relate the corrections to the Hawkin... |
1809.07623 | Sebastien Galtier | S\'ebastien Galtier, Sergey V. Nazarenko, \'Eric Buchlin, Simon
Thalabard | Nonlinear Diffusion Models for Gravitational Wave Turbulence | 5 figures | null | 10.1016/j.physd.2019.01.007 | null | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A fourth-order and a second-order nonlinear diffusion models in spectral
space are proposed to describe gravitational wave turbulence in the
approximation of strongly local interactions. We show analytically that the
model equations satisfy the conservation of energy and wave action, and
reproduce the power law solut... | [
{
"created": "Tue, 18 Sep 2018 15:34:56 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Galtier",
"Sébastien",
""
],
[
"Nazarenko",
"Sergey V.",
""
],
[
"Buchlin",
"Éric",
""
],
[
"Thalabard",
"Simon",
""
]
] | A fourth-order and a second-order nonlinear diffusion models in spectral space are proposed to describe gravitational wave turbulence in the approximation of strongly local interactions. We show analytically that the model equations satisfy the conservation of energy and wave action, and reproduce the power law solutio... |
0902.2844 | Rajesh R. Parwani | Le-Huy Nguyen and Rajesh R. Parwani | Singularity Avoidance in Nonlinear Quantum Cosmology | 6 pages. Presented at the DSU conference in Cairo, Egypt 2008. Typos
in eq. 22 and 29 of the proceedings version corrected here | AIP Conf.Proc.1115:180-185,2009 | 10.1063/1.3131494 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend our previous study on the effects of an information-theoretically
motivated nonlinear correction to the Wheeler-deWitt equation in the
minisuperspace scheme for FRW universes. Firstly we show that even when the
geometry is hyperbolic, and matter given by a cosmological constant, the
nonlinearity can still p... | [
{
"created": "Tue, 17 Feb 2009 07:24:19 GMT",
"version": "v1"
}
] | 2009-05-01 | [
[
"Nguyen",
"Le-Huy",
""
],
[
"Parwani",
"Rajesh R.",
""
]
] | We extend our previous study on the effects of an information-theoretically motivated nonlinear correction to the Wheeler-deWitt equation in the minisuperspace scheme for FRW universes. Firstly we show that even when the geometry is hyperbolic, and matter given by a cosmological constant, the nonlinearity can still pro... |
0811.1266 | Philippe G. LeFloch | Paulo Amorim, Christine Bernardi, and Philippe G. LeFloch | Computing Gowdy spacetimes via spectral evolution in future and past
directions | 19 pages, 12 figures | Class.Quant.Grav.26:025007,2009 | 10.1088/0264-9381/26/2/025007 | null | gr-qc math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a system of nonlinear wave equations with constraints that arises
from the Einstein equations of general relativity and describes the geometry of
the so-called Gowdy symmetric spacetimes on T3. We introduce two numerical
methods, which are based on pseudo-spectral approximation. The first approach
relies ... | [
{
"created": "Sat, 8 Nov 2008 15:11:33 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Nov 2008 22:03:53 GMT",
"version": "v2"
}
] | 2009-01-08 | [
[
"Amorim",
"Paulo",
""
],
[
"Bernardi",
"Christine",
""
],
[
"LeFloch",
"Philippe G.",
""
]
] | We consider a system of nonlinear wave equations with constraints that arises from the Einstein equations of general relativity and describes the geometry of the so-called Gowdy symmetric spacetimes on T3. We introduce two numerical methods, which are based on pseudo-spectral approximation. The first approach relies on... |
1207.3673 | Javad Taghizadeh firouzjaee | Pouria Dadras, J. T. Firouzjaee and Reza Mansouri | A concrete anti-de Sitter black hole with dynamical horizon having
toroidal cross-sections and its characteristics | improved version. arXiv admin note: text overlap with
arXiv:gr-qc/0308033 by other authors | Europhys. Lett. 100 (2012) 39001 | 10.1209/0295-5075/100/39001 | IPM/P-2012/027 | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/3.0/ | We propose a special solution of Einstein equations in the general Vaidya
form representing a dynamical black hole having horizon cross-sections with
toroidal topology. The concrete model enables us to study for the first time
dynamical horizons with toroidal topology, its area law, and the question of
matter flux in... | [
{
"created": "Mon, 16 Jul 2012 13:27:08 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2012 12:08:45 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Dadras",
"Pouria",
""
],
[
"Firouzjaee",
"J. T.",
""
],
[
"Mansouri",
"Reza",
""
]
] | We propose a special solution of Einstein equations in the general Vaidya form representing a dynamical black hole having horizon cross-sections with toroidal topology. The concrete model enables us to study for the first time dynamical horizons with toroidal topology, its area law, and the question of matter flux insi... |
0907.3081 | Jean-Philippe Uzan | Jean-Philippe Uzan | Fundamental constants and tests of general relativity - Theoretical and
cosmological considerations | Proceedings of the workshop ``The nature of gravity, confronting
theory and experiment in space'', ISSI, Bern, october 2008 | null | 10.1007/s11214-009-9503-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The tests of the constancy of the fundamental constants are tests of the
local position invariance and thus of the equivalence principle. We summarize
the various constraints that have been obtained and then describe the
connection between varying constants and extensions of general relativity. To
finish, we discuss ... | [
{
"created": "Fri, 17 Jul 2009 14:13:55 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Uzan",
"Jean-Philippe",
""
]
] | The tests of the constancy of the fundamental constants are tests of the local position invariance and thus of the equivalence principle. We summarize the various constraints that have been obtained and then describe the connection between varying constants and extensions of general relativity. To finish, we discuss th... |
0705.3620 | Darren Golbourn | Leor Barack and Darren A Golbourn | Scalar-field perturbations from a particle orbiting a black hole using
numerical evolution in 2+1 dimensions | Accepted for publication in PRD, minor typographical corrections,
references updated, 25 pages, 22 eps figures | Phys.Rev.D76:044020,2007 | 10.1103/PhysRevD.76.044020 | null | gr-qc | null | We present a new technique for time-domain numerical evolution of the scalar
field generated by a pointlike scalar charge orbiting a black hole. Time-domain
evolution offers an efficient way for calculating black hole perturbations,
especially as input for computations of the local self force acting on orbiting
parti... | [
{
"created": "Thu, 24 May 2007 16:51:44 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Aug 2007 15:03:36 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barack",
"Leor",
""
],
[
"Golbourn",
"Darren A",
""
]
] | We present a new technique for time-domain numerical evolution of the scalar field generated by a pointlike scalar charge orbiting a black hole. Time-domain evolution offers an efficient way for calculating black hole perturbations, especially as input for computations of the local self force acting on orbiting particl... |
gr-qc/9707054 | Zloshchastiev Konstantin | Konstantin G. Zloshchastiev | Radiation fluid singular hypersurfaces with de Sitter interior as models
of charged extended particles in general relativity | LaTeX (IOPP style); final version | Class.Quant.Grav. 16 (1999) 1737-1744 | 10.1088/0264-9381/16/6/308 | null | gr-qc | null | In present paper we construct the classical and minisuperspace quantum models
of an extended charged particle. The modelling is based on the radiation fluid
singular hypersurface filled with physical vacuum. We demonstrate that both at
classical and quantum levels such a model can have equilibrium states at the
radiu... | [
{
"created": "Fri, 25 Jul 1997 13:26:05 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Aug 1997 09:13:08 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jul 1998 05:32:56 GMT",
"version": "v3"
},
{
"created": "Sat, 29 May 1999 14:32:31 GMT",
"version": "v4"
}
] | 2009-10-30 | [
[
"Zloshchastiev",
"Konstantin G.",
""
]
] | In present paper we construct the classical and minisuperspace quantum models of an extended charged particle. The modelling is based on the radiation fluid singular hypersurface filled with physical vacuum. We demonstrate that both at classical and quantum levels such a model can have equilibrium states at the radius ... |
1001.1112 | Edward Anderson | Edward Anderson | Relational mechanics of shape and scale | Just a few minor changes/references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relational particle mechanics models (RPM's) are useful models for the
problem of time in quantum gravity and other foundational issues in quantum
cosmology. Some concrete examples of scalefree RPM's have already been studied,
but it is the case with scale that is needed for the semiclassical and
dilational internal ... | [
{
"created": "Thu, 7 Jan 2010 17:01:52 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Feb 2010 11:55:03 GMT",
"version": "v2"
}
] | 2010-02-15 | [
[
"Anderson",
"Edward",
""
]
] | Relational particle mechanics models (RPM's) are useful models for the problem of time in quantum gravity and other foundational issues in quantum cosmology. Some concrete examples of scalefree RPM's have already been studied, but it is the case with scale that is needed for the semiclassical and dilational internal ti... |
gr-qc/0701086 | Emanuele Berti | Emanuele Berti, Vitor Cardoso, Jose A. Gonzalez, Ulrich Sperhake | Mining information from binary black hole mergers: a comparison of
estimation methods for complex exponentials in noise | 20 pages, 7 figures, minor changes to match version in press in PRD | Phys.Rev.D75:124017,2007 | 10.1103/PhysRevD.75.124017 | null | gr-qc astro-ph | null | The ringdown phase following a binary black hole merger is usually assumed to
be well described by a linear superposition of complex exponentials
(quasinormal modes). In the strong-field conditions typical of a binary black
hole merger, non-linear effects may produce mode coupling. Artificial mode
coupling can also b... | [
{
"created": "Tue, 16 Jan 2007 19:56:35 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jun 2007 14:46:53 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Gonzalez",
"Jose A.",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | The ringdown phase following a binary black hole merger is usually assumed to be well described by a linear superposition of complex exponentials (quasinormal modes). In the strong-field conditions typical of a binary black hole merger, non-linear effects may produce mode coupling. Artificial mode coupling can also be ... |
1904.11917 | Tommi Markkanen | Tommi Markkanen, Arttu Rajantie, Stephen Stopyra and Tommi Tenkanen | Scalar correlation functions in de Sitter space from the stochastic
spectral expansion | 21 pages, 4 figures, 2 tables. v2: minor revision, version published
in JCAP | null | 10.1088/1475-7516/2019/08/001 | IMPERIAL/TP/2019/TM/03 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider light scalar fields during inflation and show how the stochastic
spectral expansion method can be used to calculate two-point correlation
functions of an arbitrary local function of the field in de Sitter space. In
particular, we use this approach for a massive scalar field with quartic
self-interactions ... | [
{
"created": "Fri, 26 Apr 2019 16:18:57 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2019 16:27:29 GMT",
"version": "v2"
}
] | 2019-08-02 | [
[
"Markkanen",
"Tommi",
""
],
[
"Rajantie",
"Arttu",
""
],
[
"Stopyra",
"Stephen",
""
],
[
"Tenkanen",
"Tommi",
""
]
] | We consider light scalar fields during inflation and show how the stochastic spectral expansion method can be used to calculate two-point correlation functions of an arbitrary local function of the field in de Sitter space. In particular, we use this approach for a massive scalar field with quartic self-interactions to... |
0804.1674 | Bernard Lavenda | B. H. Lavenda | Hyperbolic nature of uniformly rotating systems and their relation to
gravity | 8 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Special relativity corresponds to hyperbolic geometry at constant velocity
while the so-called general relativity corresponds to hyperbolic geometry of
uniformly accelerated systems. Generalized expressions for angular momentum,
centrifugal and Coriolis forces are found in hyperbolic space, which reduce to
the usual ... | [
{
"created": "Thu, 10 Apr 2008 11:25:03 GMT",
"version": "v1"
}
] | 2008-04-11 | [
[
"Lavenda",
"B. H.",
""
]
] | Special relativity corresponds to hyperbolic geometry at constant velocity while the so-called general relativity corresponds to hyperbolic geometry of uniformly accelerated systems. Generalized expressions for angular momentum, centrifugal and Coriolis forces are found in hyperbolic space, which reduce to the usual ex... |
2308.07475 | Todd Oliynyk | Florian Beyer and Todd A. Oliynyk | Past stability of FLRW solutions to the Einstein-Euler-scalar field
equations and their big bang singularites | arXiv admin note: substantial text overlap with arXiv:2112.07730 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish, in spacetime dimensions $n\geq 3$, the nonlinear stability in
the contracting direction of Friedmann-Lema\^itre-Robertson-Walker (FLRW)
solutions to the Einstein-Euler-scalar field equations with linear equations of
state $P=c_s^2 \rho$ for sounds speeds $c_s$ satisfying $1/(n-1)<c_s^2 < 1$. We
further ... | [
{
"created": "Mon, 14 Aug 2023 22:01:53 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Beyer",
"Florian",
""
],
[
"Oliynyk",
"Todd A.",
""
]
] | We establish, in spacetime dimensions $n\geq 3$, the nonlinear stability in the contracting direction of Friedmann-Lema\^itre-Robertson-Walker (FLRW) solutions to the Einstein-Euler-scalar field equations with linear equations of state $P=c_s^2 \rho$ for sounds speeds $c_s$ satisfying $1/(n-1)<c_s^2 < 1$. We further sh... |
gr-qc/9506056 | null | Giampiero Esposito and Giuseppe Pollifrone | Spin-Raising Operators and Spin-3/2 Potentials in Quantum Cosmology | 13 pages, plain-tex, recently appearing in Classical and Quantum
Gravity, volume 11, April 1994, pages 897-903. Apologies for the delay in
circulating the file, due to technical problems now fixed | Class.Quant.Grav.11:897-904,1994 | 10.1088/0264-9381/11/4/009 | DSF report 95/32 (see SLAC for previous data) | gr-qc | null | Local boundary conditions involving field strengths and the normal to the
boundary, originally studied in anti-de Sitter space-time, have been recently
considered in one-loop quantum cosmology. This paper derives the conditions
under which spin-raising operators preserve these local boundary conditions on
a 3-sphere ... | [
{
"created": "Tue, 27 Jun 1995 06:52:20 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Esposito",
"Giampiero",
""
],
[
"Pollifrone",
"Giuseppe",
""
]
] | Local boundary conditions involving field strengths and the normal to the boundary, originally studied in anti-de Sitter space-time, have been recently considered in one-loop quantum cosmology. This paper derives the conditions under which spin-raising operators preserve these local boundary conditions on a 3-sphere fo... |
1705.06647 | John Barrow | John D. Barrow and Chandrima Ganguly | The Shape of Bouncing Universes | Awarded Honorable Mention in the 2017 Gravity Research Foundation
Essay competition; 4 pages, 6 figures | Int. J. Mod. Phys. D 26, 1743016 (2017) | 10.1142/S0218271817430167 | null | gr-qc astro-ph.CO hep-th physics.pop-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | What happens to the most general closed oscillating universes in general
relativity? We sketch the development of interest in cyclic universes from the
early work of Friedmann and Tolman to modern variations introduced by the
presence of a cosmological constant. Then we show what happens in the cyclic
evolution of th... | [
{
"created": "Thu, 18 May 2017 15:21:53 GMT",
"version": "v1"
}
] | 2018-01-08 | [
[
"Barrow",
"John D.",
""
],
[
"Ganguly",
"Chandrima",
""
]
] | What happens to the most general closed oscillating universes in general relativity? We sketch the development of interest in cyclic universes from the early work of Friedmann and Tolman to modern variations introduced by the presence of a cosmological constant. Then we show what happens in the cyclic evolution of the ... |
2304.00348 | Sohrab Rahvar | Sohrab Rahvar | Primordial black hole collision with neutron stars and astrophysical
black holes and the observational signatures | 12 pages, 2 figures, accepted in Int. J. Mod. Phys. D | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this paper, we examine whether low-mass Primordial Black Holes (PBHs) can
be considered a plausible dark matter candidate in galactic halos. We derive
the relativistic dynamics of PBHs around the heavy compact objects and evaluate
their collision rate, as well as the likelihood of PBH capture in neutron stars
and ... | [
{
"created": "Sat, 1 Apr 2023 16:08:11 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2023 10:22:29 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Nov 2023 11:10:43 GMT",
"version": "v3"
}
] | 2023-11-22 | [
[
"Rahvar",
"Sohrab",
""
]
] | In this paper, we examine whether low-mass Primordial Black Holes (PBHs) can be considered a plausible dark matter candidate in galactic halos. We derive the relativistic dynamics of PBHs around the heavy compact objects and evaluate their collision rate, as well as the likelihood of PBH capture in neutron stars and bl... |
1012.5172 | Riccardo Sturani | R. Sturani, S. Fischetti, L. Cadonati, G. M. Guidi, J. Healy, D.
Shoemaker, A. Vicere' | Phenomenological gravitational waveforms from spinning coalescing
binaries | 9 pages, 2 figures. Results updated in v2 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An accurate knowledge of the coalescing binary gravitational waveform is
crucial for experimental searches as the ones performed by the LIGO-Virgo
collaboration. Following an earlier paper by the same authors we refine the
construction of analytical phenomenological waveforms describing the signal
sourced by generica... | [
{
"created": "Thu, 23 Dec 2010 10:41:45 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jun 2011 10:37:57 GMT",
"version": "v2"
}
] | 2011-06-24 | [
[
"Sturani",
"R.",
""
],
[
"Fischetti",
"S.",
""
],
[
"Cadonati",
"L.",
""
],
[
"Guidi",
"G. M.",
""
],
[
"Healy",
"J.",
""
],
[
"Shoemaker",
"D.",
""
],
[
"Vicere'",
"A.",
""
]
] | An accurate knowledge of the coalescing binary gravitational waveform is crucial for experimental searches as the ones performed by the LIGO-Virgo collaboration. Following an earlier paper by the same authors we refine the construction of analytical phenomenological waveforms describing the signal sourced by genericall... |
1511.02164 | Lunchakorn Tannukij | Lunchakorn Tannukij and Pitayuth Wongjun | Mass-Varying Massive Gravity with k-essence | 23 pages, 6 figures. Typos correction | null | 10.1140/epjc/s10052-015-3872-0 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a large class of mass-varying massive gravity models, the graviton mass
cannot provide the late-time cosmic expansion of the universe due to its
vanishing at late time. In this work, we propose a new class of mass-varying
massive gravity in which the graviton mass varies according to a kinetic term
of a k-essence... | [
{
"created": "Thu, 5 Nov 2015 07:49:36 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jan 2016 09:10:11 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Tannukij",
"Lunchakorn",
""
],
[
"Wongjun",
"Pitayuth",
""
]
] | For a large class of mass-varying massive gravity models, the graviton mass cannot provide the late-time cosmic expansion of the universe due to its vanishing at late time. In this work, we propose a new class of mass-varying massive gravity in which the graviton mass varies according to a kinetic term of a k-essence f... |
2207.03966 | Griselda Figueroa Aguirre | Griselda Figueroa-Aguirre | Thin-shell wormholes in N-dimensional F(R) gravity | 18 pages, 6 figures; v3: minor changes, new references added | Int. J. Mod. Phys. D 32 (2023) 2350052 | 10.1142/S0218271823500529 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, spherically symmetric thin-shell wormholes with a conformally
invariant Maxwell field for $N$-dimensional $F(R)$ gravity and constant scalar
curvature $R$ are built. Two cases are considered: symmetric wormholes and
asymmetric ones in the scalar curvature. Their stability under radial
perturbations is a... | [
{
"created": "Fri, 8 Jul 2022 15:32:19 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2023 15:13:59 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Jun 2023 11:29:43 GMT",
"version": "v3"
}
] | 2023-07-13 | [
[
"Figueroa-Aguirre",
"Griselda",
""
]
] | In this work, spherically symmetric thin-shell wormholes with a conformally invariant Maxwell field for $N$-dimensional $F(R)$ gravity and constant scalar curvature $R$ are built. Two cases are considered: symmetric wormholes and asymmetric ones in the scalar curvature. Their stability under radial perturbations is ana... |
0707.4654 | Milton Ruiz | Milton Ruiz, Miguel Alcubierre, Dario Nunez, Ryoji Takahashi | Multipole expansions for energy and momenta carried by gravitational
waves | 12 pages. Typo fixed in equation (2.25) | Gen.Rel.Grav.40:2467,2008 | 10.1007/s10714-007-0570-8 | null | gr-qc | null | We present expressions for the energy, linear momentum and angular momentum
carried away from an isolated system by gravitational radiation based on
spin-weighted spherical harmonics decomposition of the Weyl scalar $\Psi_4$. We
also show that the expressions derived are equivalent to the common expressions
obtained ... | [
{
"created": "Tue, 31 Jul 2007 16:41:06 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2007 17:17:51 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Feb 2008 15:55:56 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Ruiz",
"Milton",
""
],
[
"Alcubierre",
"Miguel",
""
],
[
"Nunez",
"Dario",
""
],
[
"Takahashi",
"Ryoji",
""
]
] | We present expressions for the energy, linear momentum and angular momentum carried away from an isolated system by gravitational radiation based on spin-weighted spherical harmonics decomposition of the Weyl scalar $\Psi_4$. We also show that the expressions derived are equivalent to the common expressions obtained wh... |
gr-qc/9402005 | null | L.B. Szabados | Two dimensional Sen connections and quasi-local energy-momentum | 20 pages, Plain Tex, II | Class.Quant.Grav.11:1847-1866,1994 | 10.1088/0264-9381/11/7/020 | null | gr-qc | null | The recently constructed two dimensional Sen connection is applied in the
problem of quasi-local energy-momentum in general relativity. First it is shown
that, because of one of the two 2 dimensional Sen--Witten identities, Penrose's
quasi-local charge integral can be expressed as a Nester--Witten integral.Then,
to f... | [
{
"created": "Wed, 2 Feb 1994 16:06:00 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Szabados",
"L. B.",
""
]
] | The recently constructed two dimensional Sen connection is applied in the problem of quasi-local energy-momentum in general relativity. First it is shown that, because of one of the two 2 dimensional Sen--Witten identities, Penrose's quasi-local charge integral can be expressed as a Nester--Witten integral.Then, to fin... |
1304.4973 | Orchidea Maria Lecian | Orchidea Maria Lecian | BKL maps and Poincar\'e sections | 21 pages, 2 tables, 2 figures; comparison with Farey maps and
relation with scars in the quantum regime added; accepted for publication on
Phys. Rev. D; matches published version | Phys. Rev. D 88, 104014 (2013) | 10.1103/PhysRevD.88.104014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological billiards arise as a map of the solution to the Einstein
equations, when the most general symmetry of the metric tensor is implemented,
under the BKL (named after Belinskii, Khalatnikov and Lifshitz) paradigm, for
which points are spatially decoupled in the asymptotical limit close to the
cosmological si... | [
{
"created": "Wed, 17 Apr 2013 21:27:26 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Oct 2013 13:28:08 GMT",
"version": "v2"
}
] | 2013-11-20 | [
[
"Lecian",
"Orchidea Maria",
""
]
] | Cosmological billiards arise as a map of the solution to the Einstein equations, when the most general symmetry of the metric tensor is implemented, under the BKL (named after Belinskii, Khalatnikov and Lifshitz) paradigm, for which points are spatially decoupled in the asymptotical limit close to the cosmological sing... |
0808.2561 | J. Fernando Barbero G. | J. Fernando Barbero G., I\~naki Garay, Eduardo J. S. Villase\~nor | Quantum Einstein-Rosen waves: Coherent states and n-point functions | 24 pages | Class.Quant.Grav.25:205013,2008 | 10.1088/0264-9381/25/20/205013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss two different types of issues concerning the quantization of
Einstein-Rosen waves. First of all we study in detail the possibility of using
the coherent states corresponding to the dynamics of the auxiliary, free
Hamiltonian appearing in the description of the model to study the full
dynamics of the system... | [
{
"created": "Tue, 19 Aug 2008 09:51:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"G.",
"J. Fernando Barbero",
""
],
[
"Garay",
"Iñaki",
""
],
[
"Villaseñor",
"Eduardo J. S.",
""
]
] | We discuss two different types of issues concerning the quantization of Einstein-Rosen waves. First of all we study in detail the possibility of using the coherent states corresponding to the dynamics of the auxiliary, free Hamiltonian appearing in the description of the model to study the full dynamics of the system. ... |
gr-qc/0001098 | Rosario Martin | Rosario Martin and Enric Verdaguer | Stochastic semiclassical fluctuations in Minkowski spacetime | 28 pages, RevTeX, no figures | Phys.Rev. D61 (2000) 124024 | 10.1103/PhysRevD.61.124024 | null | gr-qc hep-th | null | The semiclassical Einstein-Langevin equations which describe the dynamics of
stochastic perturbations of the metric induced by quantum stress-energy
fluctuations of matter fields in a given state are considered on the background
of the ground state of semiclassical gravity, namely, Minkowski spacetime and a
scalar fi... | [
{
"created": "Fri, 28 Jan 2000 16:16:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Martin",
"Rosario",
""
],
[
"Verdaguer",
"Enric",
""
]
] | The semiclassical Einstein-Langevin equations which describe the dynamics of stochastic perturbations of the metric induced by quantum stress-energy fluctuations of matter fields in a given state are considered on the background of the ground state of semiclassical gravity, namely, Minkowski spacetime and a scalar fiel... |
gr-qc/0010026 | Francisco Navarro | F. J. Chinea (Univ. Complutense, Madrid (Spain)), F. Navarro-Lerida
(Univ. Complutense, Madrid (Spain)) | Twisting type-N vacuum fields with a group $H_2$ | LaTeX, 11 pages. To be published in Classical and Quantum Gravity | Class.Quant.Grav. 17 (2000) 4587-4596 | 10.1088/0264-9381/17/21/314 | null | gr-qc | null | We derive the equations corresponding to twisting type-N vacuum gravitational
fields with one Killing vector and one homothetic Killing vector by using the
same approach as that developed by one of us in order to treat the case with
two non-commuting Killing vectors. We study the case when the homothetic
parameter $\... | [
{
"created": "Sat, 7 Oct 2000 21:28:27 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chinea",
"F. J.",
"",
"Univ. Complutense, Madrid"
],
[
"Navarro-Lerida",
"F.",
"",
"Univ. Complutense, Madrid"
]
] | We derive the equations corresponding to twisting type-N vacuum gravitational fields with one Killing vector and one homothetic Killing vector by using the same approach as that developed by one of us in order to treat the case with two non-commuting Killing vectors. We study the case when the homothetic parameter $\ph... |
0710.0614 | Lawrence E. Kidder | Lawrence E. Kidder | Using Full Information When Computing Modes of Post-Newtonian Waveforms
From Inspiralling Compact Binaries in Circular Orbit | 15 pages | Phys.Rev.D77:044016,2008 | 10.1103/PhysRevD.77.044016 | null | gr-qc | null | The increasing sophistication and accuracy of numerical simulations of
compact binaries (especially binary black holes) presents the opportunity to
test the regime in which post-Newtonian (PN) predictions for the emitted
gravitational waves are accurate. In order to confront numerical results with
those of post-Newto... | [
{
"created": "Tue, 2 Oct 2007 19:46:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kidder",
"Lawrence E.",
""
]
] | The increasing sophistication and accuracy of numerical simulations of compact binaries (especially binary black holes) presents the opportunity to test the regime in which post-Newtonian (PN) predictions for the emitted gravitational waves are accurate. In order to confront numerical results with those of post-Newtoni... |
2012.12606 | David Senjaya | David Senjaya and Alejandro Saiz Rivera | Canonical Quantization of Neutral and Charged Static Black Hole as a
Gravitational Atom | Presented in Siam Physics Conference 2020 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The gravitational field is usually neglected in the calculation of atomic
energy levels as its effect is much weaker than the electromagnetic field, but
that is not the case for a particle orbiting a black hole. In this work, the
canonical quantization of a massive and massless particles under gravitational
field exe... | [
{
"created": "Wed, 23 Dec 2020 11:17:17 GMT",
"version": "v1"
}
] | 2020-12-24 | [
[
"Senjaya",
"David",
""
],
[
"Rivera",
"Alejandro Saiz",
""
]
] | The gravitational field is usually neglected in the calculation of atomic energy levels as its effect is much weaker than the electromagnetic field, but that is not the case for a particle orbiting a black hole. In this work, the canonical quantization of a massive and massless particles under gravitational field exert... |
gr-qc/9911043 | Simon Davis | Simon Davis and Hugh Luckock | The Effect of Higher-Order Curvature Terms on String Quantum Cosmology | 24 pages, TeX. Several remarks on operator ordering, the complete
computation of $H_1\psi_0$, and approximate solutions of the $a$ and $\Phi$
equations of motion, which are stable and exponentially expanding, have been
included. Substantial revision of equations (5)-(7), (10)-(20) from version 2 | Phys.Lett. B485 (2000) 408-421 | 10.1016/S0370-2693(00)00610-9 | Report 99-23 | gr-qc | null | Several new results regarding the quantum cosmology of the quadratic gravity
theory derived from the heterotic string effective action are presented. After
describing techniques for solving the Wheeler-De Witt equation with appropriate
boundary conditions, it is shown that this quantum cosmological model may be
compa... | [
{
"created": "Wed, 10 Nov 1999 23:04:20 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Feb 2000 08:06:11 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Aug 2000 14:31:11 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Davis",
"Simon",
""
],
[
"Luckock",
"Hugh",
""
]
] | Several new results regarding the quantum cosmology of the quadratic gravity theory derived from the heterotic string effective action are presented. After describing techniques for solving the Wheeler-De Witt equation with appropriate boundary conditions, it is shown that this quantum cosmological model may be compare... |
1212.2709 | Yousef Bisabr | Yousef Bisabr (Farzan-Nahad) | On the Chameleon Brans-Dicke Cosmology | 9 pages, no figure | Phys. Rev. D 86, 127503 (2012) | 10.1103/PhysRevD.86.127503 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a generalized Brans-Dicke model in which the scalar field has a
potential function and is also allowed to couple non-minimally with the matter
sector. We assume a power law form for the potential and the coupling functions
as the inputs of the model and show that acceleration of the universe can be
realiz... | [
{
"created": "Wed, 12 Dec 2012 05:41:14 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2012 05:50:17 GMT",
"version": "v2"
}
] | 2012-12-14 | [
[
"Bisabr",
"Yousef",
"",
"Farzan-Nahad"
]
] | We consider a generalized Brans-Dicke model in which the scalar field has a potential function and is also allowed to couple non-minimally with the matter sector. We assume a power law form for the potential and the coupling functions as the inputs of the model and show that acceleration of the universe can be realized... |
1301.5508 | Radu Slobodeanu Al. | Radu Slobodeanu | Shear-free perfect fluids with linear equation of state | 24 pages. Expanded Sections 1, 7 and 8; minor change in the end of
Section 4; added references. Mathematica files available at
http://unibuc.ro/prof/slobodeanu_r_a/resurse.php | null | 10.1088/0264-9381/31/12/125012 | null | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that shear-free perfect fluid solutions of Einstein's field
equations must be either expansion-free or non-rotating (as conjectured by
Treciokas and Ellis) for all linear equations of state $p = w \rho$ except for
six values of $w$.
| [
{
"created": "Wed, 23 Jan 2013 14:14:52 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2013 11:21:27 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Slobodeanu",
"Radu",
""
]
] | We prove that shear-free perfect fluid solutions of Einstein's field equations must be either expansion-free or non-rotating (as conjectured by Treciokas and Ellis) for all linear equations of state $p = w \rho$ except for six values of $w$. |
gr-qc/0401063 | Slava G. Turyshev | Slava G. Turyshev, Michael Shao and Kenneth L. Nordtvedt Jr | The Laser Astrometric Test of Relativity Mission | 8 pages, 2 figures, invited talk given at the Second International
Conference on Particle and Fundamental Physics in Space (SpacePart'03), 10-12
December 2003, Washington, DC | Nucl.Phys.Proc.Suppl. 134 (2004) 171-178 | 10.1088/0264-9381/21/12/001 | null | gr-qc | null | This paper discusses new fundamental physics experiment to test relativistic
gravity at the accuracy better than the effects of the 2nd order in the
gravitational field strength. The Laser Astrometric Test Of Relativity (LATOR)
mission uses laser interferometry between two micro-spacecraft whose lines of
sight pass c... | [
{
"created": "Thu, 15 Jan 2004 07:57:07 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Shao",
"Michael",
""
],
[
"Nordtvedt",
"Kenneth L.",
"Jr"
]
] | This paper discusses new fundamental physics experiment to test relativistic gravity at the accuracy better than the effects of the 2nd order in the gravitational field strength. The Laser Astrometric Test Of Relativity (LATOR) mission uses laser interferometry between two micro-spacecraft whose lines of sight pass clo... |
2008.04404 | John W. Moffat | J. W. Moffat | Modified Gravity (MOG) and Heavy Neutron Star in Mass Gap | 4 pages, no figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The modified gravity (MOG) theory is applied to the gravitational wave binary
merger GW190814 to demonstrate that the modified Tolman-Oppenheimer-Volkoff
equation for a neutron star can produce a mass $M=2.6 -2.7 M_\odot$, allowing
for the binary secondary component to be identified as a heavy neutron star in
the hyp... | [
{
"created": "Mon, 10 Aug 2020 20:27:30 GMT",
"version": "v1"
}
] | 2020-08-17 | [
[
"Moffat",
"J. W.",
""
]
] | The modified gravity (MOG) theory is applied to the gravitational wave binary merger GW190814 to demonstrate that the modified Tolman-Oppenheimer-Volkoff equation for a neutron star can produce a mass $M=2.6 -2.7 M_\odot$, allowing for the binary secondary component to be identified as a heavy neutron star in the hypot... |
gr-qc/0111097 | Daniel Grumiller | Daniel Grumiller | Virtual black hole phenomenology from 2d dilaton theories | 17 pages, 13 figures | Class.Quant.Grav. 19 (2002) 997-1009 | 10.1088/0264-9381/19/5/311 | TUW-01-31 | gr-qc hep-th | null | Equipped with the tools of (spherically reduced) dilaton gravity in first
order formulation and with the results for the lowest order S-matrix for s-wave
gravitational scattering (P. Fischer, D. Grumiller, W. Kummer, and D.
Vassilevich, gr-qc/0105034) new properties of the ensuing cross-section are
discussed. We find... | [
{
"created": "Wed, 28 Nov 2001 16:13:47 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2002 12:51:47 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Grumiller",
"Daniel",
""
]
] | Equipped with the tools of (spherically reduced) dilaton gravity in first order formulation and with the results for the lowest order S-matrix for s-wave gravitational scattering (P. Fischer, D. Grumiller, W. Kummer, and D. Vassilevich, gr-qc/0105034) new properties of the ensuing cross-section are discussed. We find C... |
2407.07043 | Ethan Payne | Ethan Payne, Maximiliano Isi, Katerina Chatziioannou, Luis Lehner,
Yanbei Chen, Will M. Farr | The curvature dependence of gravitational-wave tests of General
Relativity | 8 pages, 3 figures | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | High-energy extensions to General Relativity modify the Einstein-Hilbert
action with higher-order curvature corrections and theory-specific coupling
constants. The order of these corrections imprints a universal curvature
dependence on observations while the coupling constant controls the deviation
strength. In this ... | [
{
"created": "Tue, 9 Jul 2024 17:04:10 GMT",
"version": "v1"
}
] | 2024-07-10 | [
[
"Payne",
"Ethan",
""
],
[
"Isi",
"Maximiliano",
""
],
[
"Chatziioannou",
"Katerina",
""
],
[
"Lehner",
"Luis",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Farr",
"Will M.",
""
]
] | High-energy extensions to General Relativity modify the Einstein-Hilbert action with higher-order curvature corrections and theory-specific coupling constants. The order of these corrections imprints a universal curvature dependence on observations while the coupling constant controls the deviation strength. In this Le... |
2110.02704 | Lorenzo Annulli | Lorenzo Annulli | Challenging theories of gravitation: dark matter, compact objects and
gravitational waves | 224 pages, PhD Thesis | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most accurate model to describe the gravitational interaction is the
well-known theory of General Relativity. Several observational evidences
corroborate the legitimacy of the theory compared to the older Newtonian
gravity. General Relativity furthermore predicts the existence of gravitational
waves, i.e. spaceti... | [
{
"created": "Wed, 6 Oct 2021 12:44:12 GMT",
"version": "v1"
}
] | 2021-10-07 | [
[
"Annulli",
"Lorenzo",
""
]
] | The most accurate model to describe the gravitational interaction is the well-known theory of General Relativity. Several observational evidences corroborate the legitimacy of the theory compared to the older Newtonian gravity. General Relativity furthermore predicts the existence of gravitational waves, i.e. spacetime... |
gr-qc/0108047 | Michael D. Seifert | M. Seifert | Angle and Volume Studies in Quantized Space | Undergraduate thesis. 85 pp. (incl. TOC & appendices), 21 figures
(not incl. diagrams in eqns.) | null | null | null | gr-qc | null | The search for a quantum theory of gravity is one of the major challenges
facing theoretical physics today. While no complete theory exists, a promising
avenue of research is the loop quantum gravity approach. In this approach,
quantum states are represented by spin networks, essentially graphs with
weighted edges. S... | [
{
"created": "Sun, 19 Aug 2001 15:27:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Seifert",
"M.",
""
]
] | The search for a quantum theory of gravity is one of the major challenges facing theoretical physics today. While no complete theory exists, a promising avenue of research is the loop quantum gravity approach. In this approach, quantum states are represented by spin networks, essentially graphs with weighted edges. Sin... |
gr-qc/0401113 | Jose A. Gonzalez | Miguel Alcubierre and Jose A. Gonzalez | Regularization of spherically symmetric evolution codes in numerical
relativity | 7 pages, 4 figures, submitted to Computer Physics Communications | Comput.Phys.Commun. 167 (2005) 76-84 | 10.1016/j.cpc.2005.01.008 | null | gr-qc | null | The lack of regularity of geometric variables at the origin is often a source
of serious problem for spherically symmetric evolution codes in numerical
relativity. One usually deals with this by restricting the gauge and solving
the hamiltonian constraint for the metric. Here we present a generic algorithm
for dealin... | [
{
"created": "Wed, 28 Jan 2004 19:25:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Gonzalez",
"Jose A.",
""
]
] | The lack of regularity of geometric variables at the origin is often a source of serious problem for spherically symmetric evolution codes in numerical relativity. One usually deals with this by restricting the gauge and solving the hamiltonian constraint for the metric. Here we present a generic algorithm for dealing ... |
1004.2470 | Mauro Cattani | M.Cattani | Gravitational Waves III: Detecting Systems | 12 pages 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper we have deduced the basic equations that predict the
emission of gravitational waves (GW) according to the Einstein gravitation
theory. In a subsequent paper these equations have been used to calculate the
luminosities and the amplitudes of the waves generated by binary stars,
pulsations of neutron ... | [
{
"created": "Wed, 14 Apr 2010 18:43:23 GMT",
"version": "v1"
}
] | 2010-04-15 | [
[
"Cattani",
"M.",
""
]
] | In a recent paper we have deduced the basic equations that predict the emission of gravitational waves (GW) according to the Einstein gravitation theory. In a subsequent paper these equations have been used to calculate the luminosities and the amplitudes of the waves generated by binary stars, pulsations of neutron st... |
gr-qc/0205016 | Simonetta Frittelli | Simonetta Frittelli and Ezra T. Newman | Dynamics of Fermat potentials in non-perturbative gravitational lensing | Accepted for publication in Phys. Rev. D | Phys.Rev. D65 (2002) 123006 | 10.1103/PhysRevD.65.123006 | null | gr-qc astro-ph | null | We present a framework, based on the null-surface formulation of general
relativity, for discussing the dynamics of Fermat potentials for gravitational
lensing in a generic situation without approximations of any kind.
Additionally, we derive two lens equations: one for the case of thick compact
lenses and the other ... | [
{
"created": "Fri, 3 May 2002 20:35:13 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Frittelli",
"Simonetta",
""
],
[
"Newman",
"Ezra T.",
""
]
] | We present a framework, based on the null-surface formulation of general relativity, for discussing the dynamics of Fermat potentials for gravitational lensing in a generic situation without approximations of any kind. Additionally, we derive two lens equations: one for the case of thick compact lenses and the other on... |
2304.10367 | Daniel Harlow | Daniel Harlow | Black holes in quantum gravity | 36 pages. This chapter is the pre-print of the version currently in
production. Please cite this chapter as the following: D.Harlow. "Black holes
in quantum gravity" in The Encyclopedia of Cosmology (Set 2): Black Holes,
edited by Z. Haiman (World Scientific, New Jersey, 2023) | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This chapter gives an overview of the quantum aspects of black holes,
focusing on the black hole information problem, the counting of black hole
entropy in string theory, and the emergence of spacetime in holography. It is
aimed at a broad physics audience, and does not presuppose knowledge of string
theory or hologr... | [
{
"created": "Wed, 19 Apr 2023 14:44:35 GMT",
"version": "v1"
}
] | 2023-04-21 | [
[
"Harlow",
"Daniel",
""
]
] | This chapter gives an overview of the quantum aspects of black holes, focusing on the black hole information problem, the counting of black hole entropy in string theory, and the emergence of spacetime in holography. It is aimed at a broad physics audience, and does not presuppose knowledge of string theory or holograp... |
1202.3864 | Amare Abebe Mr | Amare Abebe, Rituparno Goswami and Peter K.S. Dunsby | Simultaneous expansion and rotation of shear-free universes in modified
gravity | 4 pages, no figures. Contribution submitted to the proceedings of the
Spanish Relativity Meeting ERE2011, September 2011, Madrid, Spain | null | 10.1063/1.4734421 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show in a fully covariant way that, there exist a class of $f(R)$ models
for which a shear-free, almost FLRW universe can expand and rotate at the same
time .
| [
{
"created": "Fri, 17 Feb 2012 10:17:43 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Abebe",
"Amare",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Dunsby",
"Peter K. S.",
""
]
] | We show in a fully covariant way that, there exist a class of $f(R)$ models for which a shear-free, almost FLRW universe can expand and rotate at the same time . |
gr-qc/0411049 | Charles Hoyle | L. Carbone, A. Cavalleri, R. Dolesi, C.D. Hoyle, M. Hueller, S.
Vitale, and W.J. Weber | Improved Torsion Pendulum for Ground Testing of LISA Displacement
Sensors | 4 pages 1 figure, to appear in the Proceedings of the 10th Marcel
Grossmann Meeting on General Relativity | null | 10.1142/9789812704030_0258 | null | gr-qc | null | We discuss a new torsion pendulum design for ground testing of prototype LISA
(Laser Interferometer Space Antenna) displacement sensors. This new design is
directly sensitive to net forces and therefore provides a more representative
test of the noisy forces and parasitic stiffnesses acting on the test mass as
compar... | [
{
"created": "Tue, 9 Nov 2004 23:44:45 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Carbone",
"L.",
""
],
[
"Cavalleri",
"A.",
""
],
[
"Dolesi",
"R.",
""
],
[
"Hoyle",
"C. D.",
""
],
[
"Hueller",
"M.",
""
],
[
"Vitale",
"S.",
""
],
[
"Weber",
"W. J.",
""
]
] | We discuss a new torsion pendulum design for ground testing of prototype LISA (Laser Interferometer Space Antenna) displacement sensors. This new design is directly sensitive to net forces and therefore provides a more representative test of the noisy forces and parasitic stiffnesses acting on the test mass as compared... |
gr-qc/0610029 | Firmin Oliveira | Firmin J. Oliveira | Is the pioneer anomaly a counter example to the dark matter hypothesis? | Ver. 1: 4 pages. Submitted for publication. Ver. 2: 7 pages. The
extension of the Hubble law to massive particles is the same as in version 1,
but the rest is a total re-write. Intended to be submitted for publication.
Ver. 3: 8 pages. Ver. 4: 10 pages. Theoretical support added (JL Anderson)
Ver. 5: 9 pages. T... | null | 10.1007/s10773-007-9434-y | null | gr-qc | null | The Hubble law is extended to massive particles based on the de Broglie
wavelength. Due to the expansion of the universe the wavelength of an unbound
particle would increase according to its cosmological redshift. Based on the
navigation anomalies of the Pioneer 10 & 11 spacecraft it is postulated that an
unbound mas... | [
{
"created": "Sun, 8 Oct 2006 03:18:57 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2006 00:00:33 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Dec 2006 01:38:07 GMT",
"version": "v3"
},
{
"created": "Sat, 6 Jan 2007 00:16:00 GMT",
"version": "v4"
},
{
"crea... | 2009-11-11 | [
[
"Oliveira",
"Firmin J.",
""
]
] | The Hubble law is extended to massive particles based on the de Broglie wavelength. Due to the expansion of the universe the wavelength of an unbound particle would increase according to its cosmological redshift. Based on the navigation anomalies of the Pioneer 10 & 11 spacecraft it is postulated that an unbound massi... |
1201.2071 | Salvatore Capozziello | S. Capozziello, M. De Laurentis, G. Lambiase | Cosmic relic abundance and f(R) gravity | 9 pages, 2 figures | null | 10.1016/j.physletb.2012.07.007 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological consequences of $f(R)$ gravity are reviewed in the framework
of recent data obtained by PAMELA (Payload for Antimatter Matter Exploration
and Light-nuclei Astrophysics) experiment. This collaboration has reported an
excess of positron events that cannot be explained by conventional cosmology
and part... | [
{
"created": "Tue, 10 Jan 2012 15:15:50 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jul 2012 07:13:55 GMT",
"version": "v2"
}
] | 2012-07-20 | [
[
"Capozziello",
"S.",
""
],
[
"De Laurentis",
"M.",
""
],
[
"Lambiase",
"G.",
""
]
] | The cosmological consequences of $f(R)$ gravity are reviewed in the framework of recent data obtained by PAMELA (Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics) experiment. This collaboration has reported an excess of positron events that cannot be explained by conventional cosmology and partic... |
1712.07658 | Ian Ruchlin | Ian Ruchlin and Zachariah B. Etienne and Thomas W. Baumgarte | SENR/NRPy+: Numerical Relativity in Singular Curvilinear Coordinate
Systems | 23 pages, 7 figures, matches published version | Phys. Rev. D 97, 064036 (2018) | 10.1103/PhysRevD.97.064036 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on a new open-source, user-friendly numerical relativity code
package called SENR/NRPy+. Our code extends previous implementations of the
BSSN reference-metric formulation to a much broader class of curvilinear
coordinate systems, making it ideally-suited to modeling physical
configurations with approximate... | [
{
"created": "Wed, 20 Dec 2017 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Mar 2018 14:16:23 GMT",
"version": "v2"
}
] | 2018-03-30 | [
[
"Ruchlin",
"Ian",
""
],
[
"Etienne",
"Zachariah B.",
""
],
[
"Baumgarte",
"Thomas W.",
""
]
] | We report on a new open-source, user-friendly numerical relativity code package called SENR/NRPy+. Our code extends previous implementations of the BSSN reference-metric formulation to a much broader class of curvilinear coordinate systems, making it ideally-suited to modeling physical configurations with approximate o... |
gr-qc/0608020 | Andrea Geralico | Donato Bini, Christian Cherubini, Geralico Andrea, Robert T. Jantzen | Massless spinning test particles in vacuum algebraically special
spacetimes | Slightly modified version with respect to the published one [
International Journal of Modern Physics D, Vol. 15 pp. 737-758 (2006)] which
unfortunately contains few (unespected) misprints | Int.J.Mod.Phys.D15:737-758,2006 | 10.1142/S0218271806008498 | null | gr-qc | null | The motion of massless spinning test particles is investigated using the
Newman-Penrose formalism within the Mathisson-Papapetrou model extended to
massless particles by Mashhoon and supplemented by the Pirani condition. When
the "multipole reduction world line" lies along a principal null direction of
an algebraical... | [
{
"created": "Fri, 4 Aug 2006 08:53:21 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Bini",
"Donato",
""
],
[
"Cherubini",
"Christian",
""
],
[
"Andrea",
"Geralico",
""
],
[
"Jantzen",
"Robert T.",
""
]
] | The motion of massless spinning test particles is investigated using the Newman-Penrose formalism within the Mathisson-Papapetrou model extended to massless particles by Mashhoon and supplemented by the Pirani condition. When the "multipole reduction world line" lies along a principal null direction of an algebraically... |
gr-qc/0412006 | Nigel Bishop | Nigel T. Bishop | Linearized solutions of the Einstein equations within a Bondi-Sachs
framework, and implications for boundary conditions in numerical simulations | Revised following referee comments | Class.Quant.Grav. 22 (2005) 2393-2406 | 10.1088/0264-9381/22/12/006 | null | gr-qc | null | We linearize the Einstein equations when the metric is Bondi-Sachs, when the
background is Schwarzschild or Minkowski, and when there is a matter source in
the form of a thin shell whose density varies with time and angular position.
By performing an eigenfunction decomposition, we reduce the problem to a system
of l... | [
{
"created": "Thu, 2 Dec 2004 09:42:23 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2005 11:34:09 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bishop",
"Nigel T.",
""
]
] | We linearize the Einstein equations when the metric is Bondi-Sachs, when the background is Schwarzschild or Minkowski, and when there is a matter source in the form of a thin shell whose density varies with time and angular position. By performing an eigenfunction decomposition, we reduce the problem to a system of lin... |
1306.6887 | Robert Lompay | Robert R. Lompay and Alexander N. Petrov | Covariant Differential Identities and Conservation Laws in
Metric-Torsion Theories of Gravitation. I. General Consideration | 23 pages, 0 figures, revtex 4.1 | J. Math. Phys. 54, 062504 (2013) | 10.1063/1.4810017 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Arbitrary diffeomorphically invariant metric-torsion theories of gravity are
considered. It is assumed that Lagrangians of such theories contain derivatives
of field variables (tensor densities of arbitrary ranks and weights) up to a
second order only. The generalized Klein-Noether methods for constructing
manifestly... | [
{
"created": "Fri, 28 Jun 2013 16:21:33 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2013 18:37:03 GMT",
"version": "v2"
}
] | 2013-07-02 | [
[
"Lompay",
"Robert R.",
""
],
[
"Petrov",
"Alexander N.",
""
]
] | Arbitrary diffeomorphically invariant metric-torsion theories of gravity are considered. It is assumed that Lagrangians of such theories contain derivatives of field variables (tensor densities of arbitrary ranks and weights) up to a second order only. The generalized Klein-Noether methods for constructing manifestly c... |
gr-qc/9701004 | Bill Hiscock | William A. Hiscock, Shane L. Larson (Montana State University), and
Paul R. Anderson (Wake Forest University) | Semiclassical effects in black hole interiors | 29 pages, ReVTeX; 4 ps figures | Phys.Rev.D56:3571-3581,1997 | 10.1103/PhysRevD.56.3571 | MSUPHY97.01 | gr-qc | null | First-order semiclassical perturbations to the Schwarzschild black hole
geometry are studied within the black hole interior. The source of the
perturbations is taken to be the vacuum stress-energy of quantized scalar,
spinor, and vector fields, evaluated using analytic approximations developed by
Page and others (for... | [
{
"created": "Fri, 3 Jan 1997 00:34:12 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Hiscock",
"William A.",
"",
"Montana State University"
],
[
"Larson",
"Shane L.",
"",
"Montana State University"
],
[
"Anderson",
"Paul R.",
"",
"Wake Forest University"
]
] | First-order semiclassical perturbations to the Schwarzschild black hole geometry are studied within the black hole interior. The source of the perturbations is taken to be the vacuum stress-energy of quantized scalar, spinor, and vector fields, evaluated using analytic approximations developed by Page and others (for m... |
2201.12299 | Orlando Luongo | Alessio Belfiglio, Orlando Luongo, Stefano Mancini | Geometric corrections to cosmological entanglement | 8 pages, 3 figures | Phys. Rev. D, 105, 123523 (2022) | 10.1103/PhysRevD.105.123523 | null | gr-qc astro-ph.CO quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate entanglement production by inhomogeneous perturbations over a
homogeneous and isotropic cosmic background, demonstrating that the interplay
between quantum and geometric effects can have relevant consequences on
entanglement entropy, with respect to homogeneous scenarios. To do so, we focus
on a confor... | [
{
"created": "Fri, 28 Jan 2022 18:06:04 GMT",
"version": "v1"
}
] | 2022-10-17 | [
[
"Belfiglio",
"Alessio",
""
],
[
"Luongo",
"Orlando",
""
],
[
"Mancini",
"Stefano",
""
]
] | We investigate entanglement production by inhomogeneous perturbations over a homogeneous and isotropic cosmic background, demonstrating that the interplay between quantum and geometric effects can have relevant consequences on entanglement entropy, with respect to homogeneous scenarios. To do so, we focus on a conforma... |
1511.06600 | Hemza Azri | Hemza Azri | Separate Einstein-Eddington Spaces and the Cosmological Constant | Accepted in Annalen der Physik journal. 7 pages, typos corrected | Annalen Phys. 528, 404 (2016) | 10.1002/andp.201500270 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on Eddington affine variational principle on a locally product
manifold, we derive the separate Einstein space described by its Ricci tensor.
The derived field equations split into two field equations of motion that
describe two maximally symmetric spaces with two cosmological constants. We
argue that the invar... | [
{
"created": "Fri, 20 Nov 2015 13:56:41 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Dec 2015 18:45:07 GMT",
"version": "v2"
}
] | 2016-05-31 | [
[
"Azri",
"Hemza",
""
]
] | Based on Eddington affine variational principle on a locally product manifold, we derive the separate Einstein space described by its Ricci tensor. The derived field equations split into two field equations of motion that describe two maximally symmetric spaces with two cosmological constants. We argue that the invaria... |
1605.05774 | Yen Chin Ong | Fech Scen Khoo, Yen Chin Ong | Lux in obscuro: Photon Orbits of Extremal Black Holes Revisited | Some technical errors in Sec.4.2 are now fixed. Main conclusions
unchanged | Class. Quantum Grav. 33 (2016) 235002 | 10.1088/0264-9381/33/23/235002 | NORDITA-2016-40 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown in the literature that the event horizon of an extremal
asymptotically flat Reissner-Nordstrom black hole is also a stable photon
sphere. We further clarify this statement and give a general proof that this
holds for a large class of static spherically symmetric black hole spacetimes
with an extrema... | [
{
"created": "Wed, 18 May 2016 22:13:57 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2016 13:31:22 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Jul 2017 14:48:49 GMT",
"version": "v3"
}
] | 2017-07-31 | [
[
"Khoo",
"Fech Scen",
""
],
[
"Ong",
"Yen Chin",
""
]
] | It has been shown in the literature that the event horizon of an extremal asymptotically flat Reissner-Nordstrom black hole is also a stable photon sphere. We further clarify this statement and give a general proof that this holds for a large class of static spherically symmetric black hole spacetimes with an extremal ... |
1611.09032 | KaiXi Feng | Kaixi Feng | Gravitational waves induced by massless vector fields with non-minimal
coupling to gravity | 13 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we calculate the contribution of the late time mode of a
massless vector field to the power spectrum of the primordial gravitational
wave using retarded Green's propagator. We consider a non-trivial coupling
between gravity and the vector field. We find that the correction is
scale-invariant and of ord... | [
{
"created": "Mon, 28 Nov 2016 09:16:11 GMT",
"version": "v1"
}
] | 2016-11-29 | [
[
"Feng",
"Kaixi",
""
]
] | In this paper, we calculate the contribution of the late time mode of a massless vector field to the power spectrum of the primordial gravitational wave using retarded Green's propagator. We consider a non-trivial coupling between gravity and the vector field. We find that the correction is scale-invariant and of order... |
1508.03330 | Pedro Labra\~na | Sergio del Campo, Eduardo I. Guendelman, Ramon Herrera, Pedro Labrana | Classically and Quantum stable Emergent Universe from Conservation Laws | 18 pages, 10 figures, typos corrected, some improvements in the text
and comments added in conclusions. Two new appendices, references added.
Accepted for publication in JCAP. arXiv admin note: text overlap with
arXiv:1105.0651 | null | 10.1088/1475-7516/2016/08/049 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently pointed out by Mithani-Vilenkin that certain emergent
universe scenarios which are classically stable are nevertheless unstable
semiclassically to collapse. Here, we show that there is a class of emergent
universes derived from scale invariant two measures theories with spontaneous
symmetry break... | [
{
"created": "Wed, 12 Aug 2015 21:16:16 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2016 22:25:52 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"del Campo",
"Sergio",
""
],
[
"Guendelman",
"Eduardo I.",
""
],
[
"Herrera",
"Ramon",
""
],
[
"Labrana",
"Pedro",
""
]
] | It has been recently pointed out by Mithani-Vilenkin that certain emergent universe scenarios which are classically stable are nevertheless unstable semiclassically to collapse. Here, we show that there is a class of emergent universes derived from scale invariant two measures theories with spontaneous symmetry breakin... |
1111.2755 | Joan Josep Ferrando | Joan Josep Ferrando and Juan Antonio S\'aez | On the Bel radiative gravitational fields | 15 pages; no figures; v2: minor changes | Class. Quantum Grav. 29:075012, 2012 | 10.1088/0264-9381/29/7/075012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the concept of intrinsic radiative gravitational fields defined by
Bel and we show that the three radiative types, N, III and II, correspond with
the three following different physical situations: {\it pure radiation}, {\it
asymptotic pure radiation} and {\it generic} (non pure, non asymptotic pure)
{\it r... | [
{
"created": "Fri, 11 Nov 2011 14:35:22 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Apr 2012 10:41:50 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Ferrando",
"Joan Josep",
""
],
[
"Sáez",
"Juan Antonio",
""
]
] | We analyze the concept of intrinsic radiative gravitational fields defined by Bel and we show that the three radiative types, N, III and II, correspond with the three following different physical situations: {\it pure radiation}, {\it asymptotic pure radiation} and {\it generic} (non pure, non asymptotic pure) {\it rad... |
2004.14849 | Vittorio De Falco Dr | Vittorio De Falco, Emmanuele Battista, Salvatore Capozziello,
Mariafelicia De Laurentis | General relativistic Poynting-Robertson effect to diagnose wormholes
existence: static and spherically symmetric case | 17 pages, 11 figures, 1 Table. Paper accepted on April 30, 2020 on
Physical Review D | Phys. Rev. D 101, 104037, Published 20 May 2020 | 10.1103/PhysRevD.101.104037 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the equations of motion of a test particle in the equatorial plane
around a static and spherically symmetric wormhole influenced by a radiation
field including the general relativistic Poynting-Robertson effect. From the
analysis of this dynamical system, we develop a diagnostic to distinguish a
black hole ... | [
{
"created": "Thu, 30 Apr 2020 15:01:54 GMT",
"version": "v1"
},
{
"created": "Fri, 1 May 2020 09:55:20 GMT",
"version": "v2"
},
{
"created": "Wed, 20 May 2020 14:37:26 GMT",
"version": "v3"
}
] | 2020-05-21 | [
[
"De Falco",
"Vittorio",
""
],
[
"Battista",
"Emmanuele",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
]
] | We derive the equations of motion of a test particle in the equatorial plane around a static and spherically symmetric wormhole influenced by a radiation field including the general relativistic Poynting-Robertson effect. From the analysis of this dynamical system, we develop a diagnostic to distinguish a black hole fr... |
2102.04728 | Tiberiu Harko | Tiberiu Harko, Haidar Sheikhahmadi | Warm inflation with non-comoving scalar field and radiation fluid | 25 pages, 8 figures, accepted for publication in EPJC | Eur. Phys. J. C (2021) 81: 165 | 10.1140/epjc/s10052-021-08964-6 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a warm inflationary scenario in which the two dominant matter
components present in the early Universe, the scalar field, and the radiation
fluid, evolve with different four-velocities. This cosmological system is
mathematically equivalent to a single anisotropic fluid, evolving with a
four-velocity that ... | [
{
"created": "Tue, 9 Feb 2021 09:45:54 GMT",
"version": "v1"
}
] | 2021-03-15 | [
[
"Harko",
"Tiberiu",
""
],
[
"Sheikhahmadi",
"Haidar",
""
]
] | We consider a warm inflationary scenario in which the two dominant matter components present in the early Universe, the scalar field, and the radiation fluid, evolve with different four-velocities. This cosmological system is mathematically equivalent to a single anisotropic fluid, evolving with a four-velocity that is... |
1904.08776 | Ahmadjon Abdujabbarov | Sudipta Hensh, Ahmadjon Abdujabbarov, Jan Schee, Zden\v{e}k Stuchl\'ik | Gravitational lensing around Kehagias-Sfetsos compact objects surrounded
by plasma | 15 pages, 10 figures | null | 10.1140/epjc/s10052-019-7034-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the optical properties of the Kehagias-Sfetsos (KS) compact objects,
characterized by the "Ho\v{r}ava" parameter $\omega_{_{KS}}$, in the presence
of plasma, considering its homogeneous or power-law density distribution. The
strong effects of both "Ho\v{r}ava" parameter $\omega_{_{KS}}$ and plasma on
the sha... | [
{
"created": "Wed, 17 Apr 2019 06:56:20 GMT",
"version": "v1"
}
] | 2022-10-19 | [
[
"Hensh",
"Sudipta",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Schee",
"Jan",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | We study the optical properties of the Kehagias-Sfetsos (KS) compact objects, characterized by the "Ho\v{r}ava" parameter $\omega_{_{KS}}$, in the presence of plasma, considering its homogeneous or power-law density distribution. The strong effects of both "Ho\v{r}ava" parameter $\omega_{_{KS}}$ and plasma on the shado... |
2404.03872 | Abdelrahman Yasser | Nader Inan, Ahmed Farag Ali, Kimet Jusufi, Abdelrahman Yasser | Graviton mass due to dark energy as a superconducting medium:
theoretical and phenomenological aspects | Accepted for publication in JCAP | null | 10.1088/1475-7516/2024/08/012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the cosmological constant term in the Einstein field
equations can be interpreted as a stress tensor for dark energy. This stress
tensor is formally analogous to an elastic constitutive equation in continuum
mechanics. As a result, the cosmological constant leads to a "shear modulus"
and "bulk m... | [
{
"created": "Fri, 5 Apr 2024 03:22:00 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jul 2024 15:18:00 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Aug 2024 22:05:30 GMT",
"version": "v3"
}
] | 2024-08-13 | [
[
"Inan",
"Nader",
""
],
[
"Ali",
"Ahmed Farag",
""
],
[
"Jusufi",
"Kimet",
""
],
[
"Yasser",
"Abdelrahman",
""
]
] | It is well known that the cosmological constant term in the Einstein field equations can be interpreted as a stress tensor for dark energy. This stress tensor is formally analogous to an elastic constitutive equation in continuum mechanics. As a result, the cosmological constant leads to a "shear modulus" and "bulk mod... |
1407.5022 | Lorenzo Iorio | Lorenzo Iorio | Revisiting the gravitomagnetic clock effect | LaTex2e, 17 pages, 7 figures, 1 table. Figures of the
counter-revolving particles replaced. Some other changes made | Eur. Phys. J. C 84, 280 (2024) | 10.1140/epjc/s10052-024-12603-1 | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To the first post-Newtonian order, if two test particles revolve in opposite
directions about a massive, spinning body along two circular and equatorial
orbits with the same radius, they take different times to return to the
reference direction relative to which their motion is measured: it is the
so-called gravitoma... | [
{
"created": "Thu, 17 Jul 2014 15:09:36 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2023 20:20:25 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Nov 2023 09:19:27 GMT",
"version": "v3"
},
{
"created": "Sat, 2 Dec 2023 22:56:36 GMT",
"version": "v4"
},
{
"cr... | 2024-03-19 | [
[
"Iorio",
"Lorenzo",
""
]
] | To the first post-Newtonian order, if two test particles revolve in opposite directions about a massive, spinning body along two circular and equatorial orbits with the same radius, they take different times to return to the reference direction relative to which their motion is measured: it is the so-called gravitomagn... |
1906.10531 | Xiao-Xiong Zeng | Ke-Jian He, Xin-Yun Hu, Xiao-Xiong Zeng | The weak cosmic censorship conjecture and thermodynamics in the
quintessence AdS black hole under charge particle absorption | Accepted by Chin. Phys. C | Chinese Physics C 43 (2019) 125101 | 10.1088/1674-1137/43/12/125101 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Considering the cosmological constant as the pressure, we mainly study the
laws of thermodynamics and weak cosmic censorship conjecture in the
Reissner-Nordstr\"{o}m-AdS black hole surrounded by quintessence dark energy
under charged particle absorption. The first law of thermodynamics is found to
be valid as a parti... | [
{
"created": "Mon, 24 Jun 2019 07:25:37 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Aug 2019 02:22:39 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Oct 2019 03:33:00 GMT",
"version": "v3"
}
] | 2019-12-19 | [
[
"He",
"Ke-Jian",
""
],
[
"Hu",
"Xin-Yun",
""
],
[
"Zeng",
"Xiao-Xiong",
""
]
] | Considering the cosmological constant as the pressure, we mainly study the laws of thermodynamics and weak cosmic censorship conjecture in the Reissner-Nordstr\"{o}m-AdS black hole surrounded by quintessence dark energy under charged particle absorption. The first law of thermodynamics is found to be valid as a particl... |
1506.05793 | Joan Sola | Joan Sola, Adria Gomez-Valent, Javier de Cruz Perez | Hints of dynamical vacuum energy in the expanding Universe | Accepted for publication in Astrophysical Journal Letters. Extended
discussion including BBN and CMB bounds, one more table and figure.
References added | Astrophys.J. 811 (2015) L14 | 10.1088/2041-8205/811/1/L14 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently there have been claims on model-independent evidence of dynamical
dark energy. Herein we consider a fairly general class of cosmological models
with a time-evolving cosmological term of the form $\Lambda(H)=C_0+C_H
H^2+C_{\dot{H}} \dot{H}$, where $H$ is the Hubble rate. These models are well
motivated from t... | [
{
"created": "Thu, 18 Jun 2015 19:57:19 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2015 20:26:18 GMT",
"version": "v2"
}
] | 2015-10-08 | [
[
"Sola",
"Joan",
""
],
[
"Gomez-Valent",
"Adria",
""
],
[
"Perez",
"Javier de Cruz",
""
]
] | Recently there have been claims on model-independent evidence of dynamical dark energy. Herein we consider a fairly general class of cosmological models with a time-evolving cosmological term of the form $\Lambda(H)=C_0+C_H H^2+C_{\dot{H}} \dot{H}$, where $H$ is the Hubble rate. These models are well motivated from the... |
1510.04795 | Safia Ahmad | Safia Ahmad, Nurgissa Myrzakulov, R. Myrzakulov | Tachyon field non-minimally coupled to massive neutrino matter | 15 pages, 6 figures, Published version | JCAP 07 (2016) 032 | 10.1088/1475-7516/2016/07/032 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider rolling tachyon, with steep run-away type of
potentials non-minimally coupled to massive neutrino matter. The coupling
dynamically builds up at late times as neutrino matter turns non-relativistic.
In case of scaling and string inspired potentials, we have shown that
non-minimal coupling le... | [
{
"created": "Fri, 16 Oct 2015 06:50:23 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Aug 2016 09:10:22 GMT",
"version": "v2"
}
] | 2016-08-05 | [
[
"Ahmad",
"Safia",
""
],
[
"Myrzakulov",
"Nurgissa",
""
],
[
"Myrzakulov",
"R.",
""
]
] | In this paper, we consider rolling tachyon, with steep run-away type of potentials non-minimally coupled to massive neutrino matter. The coupling dynamically builds up at late times as neutrino matter turns non-relativistic. In case of scaling and string inspired potentials, we have shown that non-minimal coupling lead... |
0910.2125 | S. Mignemi | S. Mignemi | Lifetime of flying particles in canonical Doubly Special Relativity | The previous submission was wrong: it contained the file of a
differnt paper | Phys.Lett.A373:4401-4404,2009 | 10.1016/j.physleta.2009.09.068 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the corrections to the lifetime of unstable elementary particles
in some models of doubly special relativity. We assume that the speed of light
is invariant and that the position coordinates transform in such a way to
ensure the invariance of the deformed symplectic structure of phase space.
| [
{
"created": "Mon, 12 Oct 2009 10:14:13 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2009 09:13:06 GMT",
"version": "v2"
}
] | 2010-01-11 | [
[
"Mignemi",
"S.",
""
]
] | We discuss the corrections to the lifetime of unstable elementary particles in some models of doubly special relativity. We assume that the speed of light is invariant and that the position coordinates transform in such a way to ensure the invariance of the deformed symplectic structure of phase space. |
1905.07251 | Pierre Martin-Dussaud | Pierre Martin-Dussaud and Carlo Rovelli | Evaporating black-to-white hole | null | Class. Quantum Grav. 36, 245002 (2019) | 10.1088/1361-6382/ab5097 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct and discuss the form of the (effective) spacetime geometry
inside a black hole undergoing a quantum transition to a white hole, taking
into account the back-reaction of the component of the Hawking radiation
falling into the hole.
| [
{
"created": "Fri, 17 May 2019 13:20:52 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 2019 15:05:48 GMT",
"version": "v2"
}
] | 2022-08-03 | [
[
"Martin-Dussaud",
"Pierre",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We construct and discuss the form of the (effective) spacetime geometry inside a black hole undergoing a quantum transition to a white hole, taking into account the back-reaction of the component of the Hawking radiation falling into the hole. |
2209.13387 | Hui-Min Fan | Hui-Min Fan, Shiyan Zhong, Zheng-Cheng Liang, Zheng Wu, Jian-dong
Zhang, Yi-Ming Hu | Extreme-mass-ratio burst detection with TianQin | null | null | 10.1103/PhysRevD.106.124028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The capture of compact objects by massive black holes in galaxies or dwarf
galaxies will generate short gravitational wave signals, called
extreme-mass-ratio bursts (EMRBs), before evolving into extreme-mass-ratio
inspirals. Their detection will provide an investigation of the black hole
properties and shed light on ... | [
{
"created": "Tue, 27 Sep 2022 13:45:12 GMT",
"version": "v1"
}
] | 2023-01-04 | [
[
"Fan",
"Hui-Min",
""
],
[
"Zhong",
"Shiyan",
""
],
[
"Liang",
"Zheng-Cheng",
""
],
[
"Wu",
"Zheng",
""
],
[
"Zhang",
"Jian-dong",
""
],
[
"Hu",
"Yi-Ming",
""
]
] | The capture of compact objects by massive black holes in galaxies or dwarf galaxies will generate short gravitational wave signals, called extreme-mass-ratio bursts (EMRBs), before evolving into extreme-mass-ratio inspirals. Their detection will provide an investigation of the black hole properties and shed light on as... |
2006.09088 | Adam Szereszewski | Eryk Buk, Jerzy Lewandowski, Adam Szereszewski | Lie point symmetries of near-horizon geometry equation | null | Phys. Rev. D 102, 124064 (2020) | 10.1103/PhysRevD.102.124064 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All the Lie point symmetries of the near extremal horizon geometry equation,
in the case of 4-dimensional Einstein vacuum spacetime with cosmological
constant, are the diffeomorphisms of the space of the null generators of the
horizon. This result is also generalised to the Maxwell-Einstein spacetime.
| [
{
"created": "Tue, 16 Jun 2020 11:47:20 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2020 14:09:21 GMT",
"version": "v2"
}
] | 2021-01-04 | [
[
"Buk",
"Eryk",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Szereszewski",
"Adam",
""
]
] | All the Lie point symmetries of the near extremal horizon geometry equation, in the case of 4-dimensional Einstein vacuum spacetime with cosmological constant, are the diffeomorphisms of the space of the null generators of the horizon. This result is also generalised to the Maxwell-Einstein spacetime. |
1804.01439 | Pedro Bargueno | Ernesto Contreras, Pedro Bargueno, Gretel Quintero, Aurora
Perez-Martinez, Diana Alvear | Exact solutions of Einstein equations for anisotropic magnetic sources | 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have obtained exact solutions of Einstein equations for
static and axially symmetric magnetized matter, specifically in plane-symmetric
and almost-plane symmetric cases. Although these solutions impose constraints
on the components of the energy-momentum tensor, some physically interesting
situations... | [
{
"created": "Wed, 4 Apr 2018 14:36:53 GMT",
"version": "v1"
}
] | 2018-04-05 | [
[
"Contreras",
"Ernesto",
""
],
[
"Bargueno",
"Pedro",
""
],
[
"Quintero",
"Gretel",
""
],
[
"Perez-Martinez",
"Aurora",
""
],
[
"Alvear",
"Diana",
""
]
] | In this work, we have obtained exact solutions of Einstein equations for static and axially symmetric magnetized matter, specifically in plane-symmetric and almost-plane symmetric cases. Although these solutions impose constraints on the components of the energy-momentum tensor, some physically interesting situations, ... |
2405.09590 | Gamal G.L. Nashed | G.G.L. Nashed and Salvatore Capozziello | Constraining $f({\cal R})$ gravity by Pulsar {\textit SAX J1748.9-2021}
observations | 28 pages, 8 figures, Will appear in EPJC | null | null | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We discuss spherically symmetric dynamical systems in the framework of a
general model of $f({\cal R})$ gravity, i.e. $f({\cal R})={\cal R}e^{\zeta
{\cal R}}$, where $\zeta$ is a dimensional quantity in squared length units
[L$^2$]. We initially assume that the internal structure of such systems is
governed by the Kr... | [
{
"created": "Wed, 15 May 2024 10:54:46 GMT",
"version": "v1"
}
] | 2024-05-17 | [
[
"Nashed",
"G. G. L.",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | We discuss spherically symmetric dynamical systems in the framework of a general model of $f({\cal R})$ gravity, i.e. $f({\cal R})={\cal R}e^{\zeta {\cal R}}$, where $\zeta$ is a dimensional quantity in squared length units [L$^2$]. We initially assume that the internal structure of such systems is governed by the Kror... |
1805.10455 | Thomas Buchert | Thomas Buchert, Pierre Mourier, Xavier Roy | Cosmological backreaction and its dependence on spacetime foliation | 9 pages, Letter, matches published version in CQG | Class. Quantum Grav. 35 (2018) 24LT02 | 10.1088/1361-6382/aaebce | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The subject of cosmological backreaction in General Relativity is often
approached by coordinate-dependent and metric-based analyses. We present in
this letter an averaging formalism for the scalar parts of Einstein's equations
that is coordinate-independent and only functionally depends on a metric. This
formalism i... | [
{
"created": "Sat, 26 May 2018 10:04:25 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Nov 2018 11:08:29 GMT",
"version": "v2"
}
] | 2018-12-04 | [
[
"Buchert",
"Thomas",
""
],
[
"Mourier",
"Pierre",
""
],
[
"Roy",
"Xavier",
""
]
] | The subject of cosmological backreaction in General Relativity is often approached by coordinate-dependent and metric-based analyses. We present in this letter an averaging formalism for the scalar parts of Einstein's equations that is coordinate-independent and only functionally depends on a metric. This formalism is ... |
1803.10767 | Christian Corda Prof. | S. H. Hendi, Z. S. Taghadomi and C. Corda | New aspect of critical nonlinearly charged black hole | 10 pages, 2 tables, 4 figures. Accepted for publication in Physical
Review D | Phys. Rev. D 97, 084039 (2018) | 10.1103/PhysRevD.97.084039 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of a point charged particle moving in the background of the
critical power Maxwell charged AdS black holes, in a probe approximation is
studied. The extended phase space, where the cosmological constant appears as a
pressure, is regarded and the effective potential is investigated. At last, the
mass-to-cha... | [
{
"created": "Wed, 28 Mar 2018 09:53:07 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Hendi",
"S. H.",
""
],
[
"Taghadomi",
"Z. S.",
""
],
[
"Corda",
"C.",
""
]
] | The motion of a point charged particle moving in the background of the critical power Maxwell charged AdS black holes, in a probe approximation is studied. The extended phase space, where the cosmological constant appears as a pressure, is regarded and the effective potential is investigated. At last, the mass-to-charg... |
2401.13857 | Kristian Gjorgjieski | Kristian Gjorgjieski, Jutta Kunz and Petya Nedkova | Comparison of Magnetized Thick Disks around Black Holes and Boson Stars | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Boson stars are considered as promising candidates for black hole mimickers.
Similar to other compact objects they can form accretion disks around them. The
properties of these disks could possibly distinguish them from other compact
objects like black holes in future observations. Retrograde thick disks around
boson... | [
{
"created": "Wed, 24 Jan 2024 23:42:50 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Feb 2024 15:48:12 GMT",
"version": "v2"
}
] | 2024-02-06 | [
[
"Gjorgjieski",
"Kristian",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Nedkova",
"Petya",
""
]
] | Boson stars are considered as promising candidates for black hole mimickers. Similar to other compact objects they can form accretion disks around them. The properties of these disks could possibly distinguish them from other compact objects like black holes in future observations. Retrograde thick disks around boson s... |
1808.10278 | Herwig Dejonghe | Herwig Dejonghe | Spherical cosmological models: an alternative cosmology | null | null | null | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of universes are explored that are entirely in the interior of
black holes in another universe, a `mother universe'. It is argued that these
models offer a paradigm that may shed a new light on old cosmological problems.
The geometry of such a universe is discussed including how it would appear to
the ... | [
{
"created": "Tue, 28 Aug 2018 09:17:03 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2019 14:26:36 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Oct 2022 19:32:56 GMT",
"version": "v3"
}
] | 2022-10-17 | [
[
"Dejonghe",
"Herwig",
""
]
] | The properties of universes are explored that are entirely in the interior of black holes in another universe, a `mother universe'. It is argued that these models offer a paradigm that may shed a new light on old cosmological problems. The geometry of such a universe is discussed including how it would appear to the ob... |
2403.19315 | Bogeun Gwak | Hyewon Han, Bogeun Gwak | Mass fluctuations in non-rotating BTZ black holes | 17 pages, 1 figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the impact of oscillations of a black-hole mass around its
average value on the three-dimensional black hole geometry. Drawing on a
classical framework that conceptualizes fluctuations near an event horizon as
mass variations, we introduce a model where the metric of a black hole, formed
from the colla... | [
{
"created": "Thu, 28 Mar 2024 11:15:39 GMT",
"version": "v1"
}
] | 2024-03-29 | [
[
"Han",
"Hyewon",
""
],
[
"Gwak",
"Bogeun",
""
]
] | We investigate the impact of oscillations of a black-hole mass around its average value on the three-dimensional black hole geometry. Drawing on a classical framework that conceptualizes fluctuations near an event horizon as mass variations, we introduce a model where the metric of a black hole, formed from the collaps... |
1804.10793 | Jakub Mielczarek Ph.D. | Michal Mandrysz, Jakub Mielczarek | Ultralocal nature of geometrogenesis | 23 pages, 9 figures | null | 10.1088/1361-6382/aaef71 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we show that the ultralocal state of gravity can be
associated with the so-called crumpled phase of gravity, observed e.g. in
Causal Dynamical Triangulations. By considering anisotropic scaling present in
the Ho\v{r}ava-Lifshitz theory, we prove that in the ultralocal scaling limit
($z \rightarrow 0$)... | [
{
"created": "Sat, 28 Apr 2018 12:19:47 GMT",
"version": "v1"
}
] | 2018-12-26 | [
[
"Mandrysz",
"Michal",
""
],
[
"Mielczarek",
"Jakub",
""
]
] | In this article we show that the ultralocal state of gravity can be associated with the so-called crumpled phase of gravity, observed e.g. in Causal Dynamical Triangulations. By considering anisotropic scaling present in the Ho\v{r}ava-Lifshitz theory, we prove that in the ultralocal scaling limit ($z \rightarrow 0$) t... |
2103.08872 | Zhigang Bu | Zhigang Bu, Liangliang Ji and Baifei Shen | Unruh effect and angular momentum correlation of Rindler particles | 23 pages, 1 figure | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | It is well known that the rotational motion does not induce Unruh effect,
because the Minkowski vacuum coincides with the vacuum state defined by the
pure rotating observers. However, are there Rindler particles carrying orbital
angular momentum (OAM), and do they produce observable effect? To answer these
questions,... | [
{
"created": "Tue, 16 Mar 2021 06:47:07 GMT",
"version": "v1"
}
] | 2021-03-17 | [
[
"Bu",
"Zhigang",
""
],
[
"Ji",
"Liangliang",
""
],
[
"Shen",
"Baifei",
""
]
] | It is well known that the rotational motion does not induce Unruh effect, because the Minkowski vacuum coincides with the vacuum state defined by the pure rotating observers. However, are there Rindler particles carrying orbital angular momentum (OAM), and do they produce observable effect? To answer these questions, w... |
0902.3199 | Laszlo B. Szabados | Laszlo B Szabados | Towards the quasi-localization of canonical GR | 28 pages, typos corrected, a reference is changed, the text is
improved at several points, appearing in Class. Quantum Grav | null | 10.1088/0264-9381/26/12/125013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general framework for a systematic quasi-localization of canonical general
relativity and a new ingredient, the requirement of the gauge invariance of the
boundary terms appearing in the calculation of Poisson brackets, are given. As
a consequence of this it is shown, in particular, that the generator vector
fields... | [
{
"created": "Wed, 18 Feb 2009 17:27:59 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2009 12:09:10 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Szabados",
"Laszlo B",
""
]
] | A general framework for a systematic quasi-localization of canonical general relativity and a new ingredient, the requirement of the gauge invariance of the boundary terms appearing in the calculation of Poisson brackets, are given. As a consequence of this it is shown, in particular, that the generator vector fields (... |
gr-qc/0509049 | Krzysztof A. Meissner | Krzysztof A. Meissner | Eigenvalues of the volume operator in loop quantum gravity | 12 pages, version accepted in Class. Quantum Grav | Class.Quant.Grav. 23 (2006) 617-626 | 10.1088/0264-9381/23/3/005 | null | gr-qc | null | We present a simple method to calculate certain sums of the eigenvalues of
the volume operator in loop quantum gravity. We derive the asymptotic
distribution of the eigenvalues in the classical limit of very large spins
which turns out to be of a very simple form. The results can be useful for
example in the statisti... | [
{
"created": "Wed, 14 Sep 2005 13:59:38 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2006 10:59:25 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Meissner",
"Krzysztof A.",
""
]
] | We present a simple method to calculate certain sums of the eigenvalues of the volume operator in loop quantum gravity. We derive the asymptotic distribution of the eigenvalues in the classical limit of very large spins which turns out to be of a very simple form. The results can be useful for example in the statistica... |
2305.14186 | Jessica Page | Jessica Page, Tyson Littenberg | Bayesian Time Delay Interferometry for Orbiting LISA: Accounting for the
Time Dependence of Spacecraft Separations | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previous work demonstrated effective laser frequency noise (LFN) suppression
for Laser Interferometer Space Antenna (LISA) data from raw phasemeter
measurements using a Markov Chain Monte Carlo (MCMC) algorithm with fractional
delay interpolation (FDI) techniques to estimate the spacecraft separation
parameters requi... | [
{
"created": "Tue, 23 May 2023 16:07:30 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 2023 15:00:11 GMT",
"version": "v2"
}
] | 2023-05-29 | [
[
"Page",
"Jessica",
""
],
[
"Littenberg",
"Tyson",
""
]
] | Previous work demonstrated effective laser frequency noise (LFN) suppression for Laser Interferometer Space Antenna (LISA) data from raw phasemeter measurements using a Markov Chain Monte Carlo (MCMC) algorithm with fractional delay interpolation (FDI) techniques to estimate the spacecraft separation parameters require... |
2202.13935 | Marcony Silva Cunha | C. R. Muniz, H. R. Christiansen, M. S. Cunha, J. Furtado | Four-dimensional regular black strings in bilocal gravity | 12 pages, 5 figures, text improved, final version to be published in
the Annals of Physics | Annals of Physics 443, 168980 (2022) | 10.1016/j.aop.2022.168980 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we obtain a static black string solution for a bilocal
gravitational source in 3+1 dimensions. The solution is regular at the origin
and tends asymptotically to the ordinary static uncharged black string solution
of general relativity. It allows an event horizon and an internal horizon
depending on the... | [
{
"created": "Mon, 28 Feb 2022 16:34:12 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2022 02:23:52 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Jun 2022 13:39:43 GMT",
"version": "v3"
}
] | 2022-08-08 | [
[
"Muniz",
"C. R.",
""
],
[
"Christiansen",
"H. R.",
""
],
[
"Cunha",
"M. S.",
""
],
[
"Furtado",
"J.",
""
]
] | In this paper, we obtain a static black string solution for a bilocal gravitational source in 3+1 dimensions. The solution is regular at the origin and tends asymptotically to the ordinary static uncharged black string solution of general relativity. It allows an event horizon and an internal horizon depending on the v... |
1601.05965 | Pouria Pedram | Hossein Ardehali and Pouria Pedram | Chaplygin Gas Ho\v{r}ava-Lifshitz Quantum Cosmology | 11 pages, 2 figures, to appear in Physical Review D | Phys. Rev. D 93, 043532 (2016) | 10.1103/PhysRevD.93.043532 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the Chaplygin gas Ho\v{r}ava-Lifshitz quantum
cosmology. Using Schutz formalism and Arnowitt-Deser-Misner decomposition, we
obtain the corresponding Schr\"{o}dinger-Wheeler-DeWitt equation. We obtain
exact classical and quantum mechanical solutions and construct wave packets to
study the time ... | [
{
"created": "Fri, 22 Jan 2016 11:43:55 GMT",
"version": "v1"
}
] | 2016-02-24 | [
[
"Ardehali",
"Hossein",
""
],
[
"Pedram",
"Pouria",
""
]
] | In this paper, we study the Chaplygin gas Ho\v{r}ava-Lifshitz quantum cosmology. Using Schutz formalism and Arnowitt-Deser-Misner decomposition, we obtain the corresponding Schr\"{o}dinger-Wheeler-DeWitt equation. We obtain exact classical and quantum mechanical solutions and construct wave packets to study the time ev... |
2006.03339 | Tayyaba Naz | M. Farasat Shamir, Tayyaba Naz | Stellar Structures in $f(\mathcal{G})$ Gravity Admitting Noether
Symmetries | 11 pages, 5 figures | Phys. Lett. B 806 (2020) 135519 | 10.1016/j.physletb.2020.135519 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work aims to investigate some possible emergence of relativistic compact
stellar objects in modified $f(\mathcal{G})$ gravity using Noether symmetry
approach. For this purpose, we assume static spherically symmetric spacetime in
the presence of isotropic matter distribution. We construct Noether symmetry
generat... | [
{
"created": "Fri, 5 Jun 2020 09:46:33 GMT",
"version": "v1"
}
] | 2020-06-08 | [
[
"Shamir",
"M. Farasat",
""
],
[
"Naz",
"Tayyaba",
""
]
] | This work aims to investigate some possible emergence of relativistic compact stellar objects in modified $f(\mathcal{G})$ gravity using Noether symmetry approach. For this purpose, we assume static spherically symmetric spacetime in the presence of isotropic matter distribution. We construct Noether symmetry generator... |
1206.7093 | Lu\'is Filipe de Pinho Oliveira e Costa | L. Filipe O. Costa, Jos\'e Nat\'ario, Miguel Zilh\~ao | Mathisson's helical motions demystified | To appear in the Proceedings of the Spanish Relativity Meeting 2011
(ERE2011), "Towards new paradigms", Madrid 29 August - 2 September 2011 | AIP Conf.Proc. 1458 (2011) 367-370 | 10.1063/1.4734436 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of spinning test particles in general relativity is described by
Mathisson-Papapetrou-Dixon equations, which are undetermined up to a spin
supplementary condition, the latter being today still an open question. The
Mathisson-Pirani (MP) condition is known to lead to rather mysterious helical
motions which ... | [
{
"created": "Fri, 29 Jun 2012 18:27:09 GMT",
"version": "v1"
}
] | 2012-08-07 | [
[
"Costa",
"L. Filipe O.",
""
],
[
"Natário",
"José",
""
],
[
"Zilhão",
"Miguel",
""
]
] | The motion of spinning test particles in general relativity is described by Mathisson-Papapetrou-Dixon equations, which are undetermined up to a spin supplementary condition, the latter being today still an open question. The Mathisson-Pirani (MP) condition is known to lead to rather mysterious helical motions which ha... |
2204.12097 | Titus K Mathew | Sarath N, Jerin Mohan N D and Titus K Mathew | Running vacuum cosmology with bulk viscous matter | 25 pages and 11 figures | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We study the late acceleration of the universe by incorporating bulk viscous
matter with the running vacuum. The vacuum energy density varies as the squares
of the Hubble parameter ($\rho_{\Lambda}\propto H^2$), and the coefficient of
bulk viscosity of matter is proportional to the velocity of expansion ($\xi
\propto... | [
{
"created": "Tue, 26 Apr 2022 06:23:06 GMT",
"version": "v1"
}
] | 2022-04-27 | [
[
"N",
"Sarath",
""
],
[
"D",
"Jerin Mohan N",
""
],
[
"Mathew",
"Titus K",
""
]
] | We study the late acceleration of the universe by incorporating bulk viscous matter with the running vacuum. The vacuum energy density varies as the squares of the Hubble parameter ($\rho_{\Lambda}\propto H^2$), and the coefficient of bulk viscosity of matter is proportional to the velocity of expansion ($\xi \propto H... |
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