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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2312.07237 | Inna Ivanova | Victor Berezin, Inna Ivanova | Conformal invariance, cosmological particle production and imitation of
dark matter | Based on the talk presented at the ICAA-2023 Virtual Conference | null | null | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | Using a model for an ideal fluid with a variable number of particles, a
phenomenological description of the processes of particle production in strong
external fields is investigated. The conformal invariance of the creation law
is shown, which imposes rather rigorous restrictions on the possible types of
sources. It... | [
{
"created": "Tue, 12 Dec 2023 13:06:43 GMT",
"version": "v1"
}
] | 2023-12-13 | [
[
"Berezin",
"Victor",
""
],
[
"Ivanova",
"Inna",
""
]
] | Using a model for an ideal fluid with a variable number of particles, a phenomenological description of the processes of particle production in strong external fields is investigated. The conformal invariance of the creation law is shown, which imposes rather rigorous restrictions on the possible types of sources. It a... |
1702.06855 | Ahmadjon Abdujabbarov | Bobir Toshmatov, Cosimo Bambi, Bobomurat Ahmedov, Ahmadjon
Abdujabbarov, Zden\v{e}k Stuchl\'ik | Energy conditions of non-singular black hole spacetimes in conformal
gravity | 10 pages, 9 figures | Eur. Phys. J. C (2017) 77:542 | 10.1140/epjc/s10052-017-5112-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conformal gravity can elegantly solve the problem of spacetime singularities
present in Einstein's gravity. For every physical spacetime, there is an
infinite family of conformally-equivalent singularity-free metrics. In the
unbroken phase, every non-singular metric is equivalent and can be used to
infer the physical... | [
{
"created": "Tue, 21 Feb 2017 13:24:49 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2017 10:50:55 GMT",
"version": "v2"
}
] | 2017-08-15 | [
[
"Toshmatov",
"Bobir",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | Conformal gravity can elegantly solve the problem of spacetime singularities present in Einstein's gravity. For every physical spacetime, there is an infinite family of conformally-equivalent singularity-free metrics. In the unbroken phase, every non-singular metric is equivalent and can be used to infer the physical p... |
2407.09591 | Yongqiang Wang | Xin Su, Chen-Hao Hao, Yong-Qiang Wang | Ellis wormhole with nonlinear electromagnetic field | 21 pages, 8 figures. arXiv admin note: text overlap with
arXiv:2311.17557 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present the spherically symmetric wormhole in Einstein's
gravity coupling phantom field and nonlinear electromagnetic field. Numerical
results show that this solution violates the Null Energy Condition (NEC), and
as the parameters change, the ADM mass of the entire spacetime changes from
positive to... | [
{
"created": "Fri, 12 Jul 2024 17:31:52 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Su",
"Xin",
""
],
[
"Hao",
"Chen-Hao",
""
],
[
"Wang",
"Yong-Qiang",
""
]
] | In this paper, we present the spherically symmetric wormhole in Einstein's gravity coupling phantom field and nonlinear electromagnetic field. Numerical results show that this solution violates the Null Energy Condition (NEC), and as the parameters change, the ADM mass of the entire spacetime changes from positive to n... |
1011.5848 | Amitai Bin-Nun | Amitai Y. Bin-Nun | Strong Gravitational Lensing by Sgr A* | 13 pages, 9 figures. Submitted as invited review article for the GR19
issue of CQG | Class.Quant.Grav.28:114003,2011 | 10.1088/0264-9381/28/11/114003 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent years, there has been increasing recognition of the potential of
the galactic center as a probe of general relativity in the strong field. There
is almost certainly a black hole at Sgr A* in the galactic center, and this
would allow us the opportunity to probe dynamics near the exterior of the black
hole. I... | [
{
"created": "Fri, 26 Nov 2010 17:54:43 GMT",
"version": "v1"
}
] | 2011-05-24 | [
[
"Bin-Nun",
"Amitai Y.",
""
]
] | In recent years, there has been increasing recognition of the potential of the galactic center as a probe of general relativity in the strong field. There is almost certainly a black hole at Sgr A* in the galactic center, and this would allow us the opportunity to probe dynamics near the exterior of the black hole. In ... |
gr-qc/9512046 | Nobuyuki Sakai | Nobuyuki Sakai | Dynamic Monopoles and Spacetime Structure | 2 pages, latex, uuencoded postscript figures; based on gr-qc/9512045,
and presented at 1st RESCUE International Symposium THE COSMOLOGICAL CONSTANT
AND THE EVOLUTION OF THE UNIVERSE, The University of Tokyo, November 7-10,
1995 | null | null | WU-AP/56/95 | gr-qc astro-ph hep-th | null | According to previous work on magnetic monopoles, static regular solutions
are nonexistent if the vacuum expectation value of the Higgs field $\eta$ is
larger than a critical value $\eta_{{\rm cr}}$, which is of the order of the
Planck mass. In order to understand the properties of monopoles for
$\eta>\eta_{{\rm cr}}... | [
{
"created": "Thu, 28 Dec 1995 22:04:01 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 1996 07:52:42 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Sakai",
"Nobuyuki",
""
]
] | According to previous work on magnetic monopoles, static regular solutions are nonexistent if the vacuum expectation value of the Higgs field $\eta$ is larger than a critical value $\eta_{{\rm cr}}$, which is of the order of the Planck mass. In order to understand the properties of monopoles for $\eta>\eta_{{\rm cr}}$,... |
2010.06461 | Marios Bounakis | Marios Bounakis, Ian G. Moss, Gerasimos Rigopoulos | Observational constraints on Hyperinflation | 16 pages, 12 figures | null | 10.1088/1475-7516/2021/02/006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a Hyperinflation model involving a field doublet on a hyperbolic
field-space manifold and an exponential potential, providing a concise
treatment of the evolution of the entropic and adiabatic perturbations around
the homogeneous hyperbolic attractor solution. We find that the adiabatic
spectral index narrow... | [
{
"created": "Tue, 13 Oct 2020 15:14:05 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2021 16:49:01 GMT",
"version": "v2"
}
] | 2021-02-08 | [
[
"Bounakis",
"Marios",
""
],
[
"Moss",
"Ian G.",
""
],
[
"Rigopoulos",
"Gerasimos",
""
]
] | We study a Hyperinflation model involving a field doublet on a hyperbolic field-space manifold and an exponential potential, providing a concise treatment of the evolution of the entropic and adiabatic perturbations around the homogeneous hyperbolic attractor solution. We find that the adiabatic spectral index narrows ... |
gr-qc/9209015 | Juan Garcia-Bellido | Luis J. Garay and Juan Garcia-Bellido | Jordan-Brans-Dicke Quantum Wormholes and Coleman's Mechanism | 22 pp, 1 figure available upon request, LaTeX. Conclusions have been
changed | Nucl.Phys. B400 (1993) 416-434 | 10.1016/0550-3213(93)90411-H | IEM-FT-59/92 | gr-qc hep-th | null | We consider the quantum gravity and cosmology of a Jordan-Brans-Dicke theory,
predicted by string effective actions. We study its canonical formalism and
find that the constraint algebra is that of general relativity, as a
consequence of the general covariance of scalar-tensor theories. We also
analyze the problem of... | [
{
"created": "Wed, 30 Sep 1992 16:58:14 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 1992 18:58:22 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Garay",
"Luis J.",
""
],
[
"Garcia-Bellido",
"Juan",
""
]
] | We consider the quantum gravity and cosmology of a Jordan-Brans-Dicke theory, predicted by string effective actions. We study its canonical formalism and find that the constraint algebra is that of general relativity, as a consequence of the general covariance of scalar-tensor theories. We also analyze the problem of b... |
1412.8195 | Vasilis Oikonomou | V.K. Oikonomou | Loop Quantum Cosmology Matter Bounce Reconstruction from $F(R)$ Gravity
Using an Auxiliary Field | Revised version to appear in GERG | null | 10.1007/s10714-015-1970-9 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the reconstruction technique with an auxiliary field, we investigate
which $F(R)$ gravities can produce the matter bounce cosmological solutions.
Owing to the specific functional form of the matter bounce Hubble parameter,
the reconstruction technique leads, after some simplifications, to the same
Hubble parame... | [
{
"created": "Sun, 28 Dec 2014 18:35:34 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Oct 2015 13:32:27 GMT",
"version": "v2"
}
] | 2015-11-04 | [
[
"Oikonomou",
"V. K.",
""
]
] | Using the reconstruction technique with an auxiliary field, we investigate which $F(R)$ gravities can produce the matter bounce cosmological solutions. Owing to the specific functional form of the matter bounce Hubble parameter, the reconstruction technique leads, after some simplifications, to the same Hubble paramete... |
1411.0242 | Plamen Fiziev | Plamen Fiziev | Dark Energy and Dark Matter in Stars Physic | Latex file, 7 pages, 11 figures. Symposium "Frontiers of Fundamental
Physics 14", Marseille, France. arXiv admin note: substantial text overlap
with arXiv:1402.2813 | Symposium "Frontiers of Fundamental Physics 14", Marseille,
France, July, 15-18, 2014, PoS(FFP14)080 | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the basic equations and relations for the relativistic static
spherically symmetric stars (SSSS) in the model of minimal dilatonic gravity
(MDG) which is {\em locally} equivalent to the f(R) theories of gravity and
gives an alternative description of the effects of dark matter and dark energy.
The results ... | [
{
"created": "Sun, 2 Nov 2014 11:25:19 GMT",
"version": "v1"
}
] | 2014-11-05 | [
[
"Fiziev",
"Plamen",
""
]
] | We present the basic equations and relations for the relativistic static spherically symmetric stars (SSSS) in the model of minimal dilatonic gravity (MDG) which is {\em locally} equivalent to the f(R) theories of gravity and gives an alternative description of the effects of dark matter and dark energy. The results fo... |
2110.15541 | Theo Verwimp | Theo Verwimp | Unified prescription for the generation of electroweak and gravitational
gauge field Lagrangian on a principal fiber bundle | 12 pages, adapted version of the original publication: references
changed, conclusions unchanged | J.Math.Phys.31(12),December 1990,pages 3047-3052 | 10.1063/1.528957 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Glashow-Weinberg-Salam gauge field Lagrangian for electroweak theory and
the Townsend-Zardecki action for gravitation are obtained from the same type of
Yang-Mills Weil form on a principal fiber bundle over space-time, with symmetry
group U(2) and SO(2,3), respectively. The unified geometrical approach given
here... | [
{
"created": "Fri, 29 Oct 2021 05:12:14 GMT",
"version": "v1"
}
] | 2021-11-03 | [
[
"Verwimp",
"Theo",
""
]
] | The Glashow-Weinberg-Salam gauge field Lagrangian for electroweak theory and the Townsend-Zardecki action for gravitation are obtained from the same type of Yang-Mills Weil form on a principal fiber bundle over space-time, with symmetry group U(2) and SO(2,3), respectively. The unified geometrical approach given here s... |
gr-qc/9608051 | Jose Wadih Maluf | J. W. Maluf (Universidade de Brasilia) | On the distribution of gravitational energy in the de Sitter space | 18 pages, LaTex file, no figures, to appear in the J. Math. Phys | J.Math.Phys. 37 (1996) 6293-6301 | 10.1063/1.531777 | null | gr-qc | null | We calculate the total gravitational energy and the gravitational energy
density of the de Sitter space using the definition of localized energy that
arises in the framework of the teleparallel equivalent of general relativity.
We find that the gravitational energy can only be defined within the
cosmological horizon ... | [
{
"created": "Wed, 21 Aug 1996 16:26:18 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Maluf",
"J. W.",
"",
"Universidade de Brasilia"
]
] | We calculate the total gravitational energy and the gravitational energy density of the de Sitter space using the definition of localized energy that arises in the framework of the teleparallel equivalent of general relativity. We find that the gravitational energy can only be defined within the cosmological horizon an... |
0712.0539 | Bernard Linet | Bernard Linet | Electrostatics in a wormhole geometry | latex, 5 pages, a slight correction | null | null | null | gr-qc | null | We determine in closed form the electrostatic potential generated by a point
charge at rest in a simple model of static spherically symmetric wormhole. From
this, we deduce the electrostatic self-energy of this point charge.
| [
{
"created": "Tue, 4 Dec 2007 14:59:24 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2008 11:50:08 GMT",
"version": "v2"
}
] | 2008-01-14 | [
[
"Linet",
"Bernard",
""
]
] | We determine in closed form the electrostatic potential generated by a point charge at rest in a simple model of static spherically symmetric wormhole. From this, we deduce the electrostatic self-energy of this point charge. |
gr-qc/9608049 | Jose Wadih Maluf | J. W. Maluf, E. F. Martins and A. Kneip (Universidade de Brasilia) | Gravitational energy of rotating black holes | 18 pages, LaTex file, one figure | J.Math.Phys. 37 (1996) 6302-6310 | 10.1063/1.531778 | null | gr-qc | null | In the teleparallel equivalent of general relativity the energy density of
asymptotically flat gravitational fields can be naturaly defined as a scalar
density restricted to a three-dimensional spacelike hypersurface $\Sigma$.
Integration over the whole $\Sigma$ yields the standard ADM energy. After
establishing the ... | [
{
"created": "Wed, 21 Aug 1996 16:37:13 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Maluf",
"J. W.",
"",
"Universidade de Brasilia"
],
[
"Martins",
"E. F.",
"",
"Universidade de Brasilia"
],
[
"Kneip",
"A.",
"",
"Universidade de Brasilia"
]
] | In the teleparallel equivalent of general relativity the energy density of asymptotically flat gravitational fields can be naturaly defined as a scalar density restricted to a three-dimensional spacelike hypersurface $\Sigma$. Integration over the whole $\Sigma$ yields the standard ADM energy. After establishing the re... |
1904.04101 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Thin-shell wormholes from Kiselev black holes | 9 pages, 3 figures | Turk. J. Phys., vol. 43, 213-220 (2019) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper discusses the theoretical construction of thin-shell wormholes
from Kiselev black holes. We assume a barotropic equation of state for the
exotic matter on the shell. While most of these wormholes are unstable to
linearized radial perturbations, a limit argument is used to show that under
certain conditions... | [
{
"created": "Mon, 8 Apr 2019 14:48:06 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2019 14:58:57 GMT",
"version": "v2"
}
] | 2019-06-06 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | This paper discusses the theoretical construction of thin-shell wormholes from Kiselev black holes. We assume a barotropic equation of state for the exotic matter on the shell. While most of these wormholes are unstable to linearized radial perturbations, a limit argument is used to show that under certain conditions, ... |
2209.15225 | Hocheol Lee | Bum-Hoon Lee, Hochoel Lee, Wonwoo Lee, Nils A. Nilsson, and Somyadip
Thakur | Induced cosmological anisotropy by a gauge-gravity interaction | 46 pages, 15 figures; title of paper has been changed, added and
clarified discussion of results, added figure, updated references. Accepted
for publication in Physics of the Dark Universe | null | null | CQUeST-2022-0698 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simple model which generates cosmological anisotropies on top of
standard FLRW geometry. This is in some sense reminiscent of the mean field
approximation, where the mean field cosmological model under consideration
would be the standard FLRW, and the anisotropy is a small perturbative
correction on top ... | [
{
"created": "Fri, 30 Sep 2022 04:42:47 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2023 12:07:51 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Mar 2024 12:48:02 GMT",
"version": "v3"
}
] | 2024-03-22 | [
[
"Lee",
"Bum-Hoon",
""
],
[
"Lee",
"Hochoel",
""
],
[
"Lee",
"Wonwoo",
""
],
[
"Nilsson",
"Nils A.",
""
],
[
"Thakur",
"Somyadip",
""
]
] | We present a simple model which generates cosmological anisotropies on top of standard FLRW geometry. This is in some sense reminiscent of the mean field approximation, where the mean field cosmological model under consideration would be the standard FLRW, and the anisotropy is a small perturbative correction on top of... |
gr-qc/0601075 | Anna M. Nobili | G. L. Comandi, M. L. Chiofalo, R. Toncelli, D. Bramanti, E. Polacco,
and A. M. Nobili | Dynamical response of the "GGG" rotor to test the Equivalence Principle:
theory, simulation and experiment. Part I: the normal modes | Accepted for publication by "Review of Scientific Instruments" on Jan
16, 2006. 16 2-column pages, 9 figures | Rev.Sci.Instrum. 77 (2006) 034501 | 10.1063/1.2173075 | null | gr-qc | null | Recent theoretical work suggests that violation of the Equivalence Principle
might be revealed in a measurement of the fractional differential acceleration
$\eta$ between two test bodies -of different composition, falling in the
gravitational field of a source mass- if the measurement is made to the level
of $\eta\si... | [
{
"created": "Wed, 18 Jan 2006 16:07:06 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Comandi",
"G. L.",
""
],
[
"Chiofalo",
"M. L.",
""
],
[
"Toncelli",
"R.",
""
],
[
"Bramanti",
"D.",
""
],
[
"Polacco",
"E.",
""
],
[
"Nobili",
"A. M.",
""
]
] | Recent theoretical work suggests that violation of the Equivalence Principle might be revealed in a measurement of the fractional differential acceleration $\eta$ between two test bodies -of different composition, falling in the gravitational field of a source mass- if the measurement is made to the level of $\eta\sime... |
gr-qc/9911086 | Yungui Gong | Yungui Gong | On Holography in Brans-Dicke Cosmology | talk given at the 9th Midwest Relativity Conference held in
University of Illinois at Urbana-Champaign, November 12-13, 1999. 8 figures | null | null | utexas-hep-20 | gr-qc | null | The holographic bound in Brans-Dicke $k=1$ matter dominated Cosmology is
discussed. In this talk, both the apparent horizon and the particle horizon are
taken for the holographic bound. The covariant entropy conjecture proposed by
Bousso is also discussed.
| [
{
"created": "Mon, 22 Nov 1999 20:25:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gong",
"Yungui",
""
]
] | The holographic bound in Brans-Dicke $k=1$ matter dominated Cosmology is discussed. In this talk, both the apparent horizon and the particle horizon are taken for the holographic bound. The covariant entropy conjecture proposed by Bousso is also discussed. |
gr-qc/0702085 | Andre Fuzfa | A. Fuzfa, J.-M. Alimi | An Awesome Hypothesis for Dark Energy : The Abnormally Weighting Energy | 3 pages, 1 figure, prepared for the Proceedings of the 11th Marcel
Grossmann Conference, held in Berlin, Germany, July 2006 | null | 10.1142/9789812834300_0256 | null | gr-qc astro-ph | null | We introduce the Abnormally Weighting Energy (AWE) hypothesis in which dark
energy (DE) is presented as a consequence of the violation of the weak
equivalence principle (WEP) at cosmological scales by some dark sector. Indeed,
this implies a violation of the strong equivalence principle (SEP) for ordinary
matter and ... | [
{
"created": "Thu, 15 Feb 2007 09:49:05 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Fuzfa",
"A.",
""
],
[
"Alimi",
"J. -M.",
""
]
] | We introduce the Abnormally Weighting Energy (AWE) hypothesis in which dark energy (DE) is presented as a consequence of the violation of the weak equivalence principle (WEP) at cosmological scales by some dark sector. Indeed, this implies a violation of the strong equivalence principle (SEP) for ordinary matter and co... |
1902.05129 | Kayll Lake | Sheref Nasereldin and Kayll Lake | Boundary Orbits: 1 Static Spacetimes | 4 pages revtex 4.1 Updated and expanded | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of circular orbits in spacetime is of astrophysical importance. The
identification and classification of circular orbits in both static and
stationary spacetimes remains an active area of interest. Even in the simplest
static spherically symmetric case, it is well known that the introduction of a
cosmologic... | [
{
"created": "Wed, 13 Feb 2019 21:02:42 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2019 19:40:17 GMT",
"version": "v2"
}
] | 2019-06-07 | [
[
"Nasereldin",
"Sheref",
""
],
[
"Lake",
"Kayll",
""
]
] | The study of circular orbits in spacetime is of astrophysical importance. The identification and classification of circular orbits in both static and stationary spacetimes remains an active area of interest. Even in the simplest static spherically symmetric case, it is well known that the introduction of a cosmological... |
1312.1682 | Muhammad Jamil Amir | M. Jamil Amir, Sadia Sattar | Locally Rotationally Symmetric Vacuum Solutions in f(R) Gravity | 22 pages, Accepted for publication in Int. J. Theor. Phys | null | 10.1007/s10773-013-1865-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to find the Locally Rotationally Symmetric (LRS) vacuum
solutions in the context of f(R) theory of gravity. Actually, we have
considered the three metrics representing the whole family of LRS spacetimes
and solved the field equations by using metric approach as well as the
assumption of constant... | [
{
"created": "Thu, 5 Dec 2013 07:12:51 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Amir",
"M. Jamil",
""
],
[
"Sattar",
"Sadia",
""
]
] | This paper is devoted to find the Locally Rotationally Symmetric (LRS) vacuum solutions in the context of f(R) theory of gravity. Actually, we have considered the three metrics representing the whole family of LRS spacetimes and solved the field equations by using metric approach as well as the assumption of constant s... |
gr-qc/0405136 | B. S. Sathyaprakash | B.S. Sathyaprakash (Cardiff University) | Gravitational Radiation - Observing the Dark and Dense Universe | 24 pages, invited review at ICRC2003, Tsukuba, Japan | null | null | null | gr-qc | null | Astronomical observations in the electromagnetic window - microwave, radio
and optical - have revealed that most of the Universe is dark. The only reason
we know that dark matter exists is because of its gravitational influence on
luminous matter. It is plausible that a small fraction of that dark matter is
clumped, ... | [
{
"created": "Fri, 28 May 2004 00:05:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sathyaprakash",
"B. S.",
"",
"Cardiff University"
]
] | Astronomical observations in the electromagnetic window - microwave, radio and optical - have revealed that most of the Universe is dark. The only reason we know that dark matter exists is because of its gravitational influence on luminous matter. It is plausible that a small fraction of that dark matter is clumped, an... |
2110.10667 | Ilkka M\"akinen | Jerzy Lewandowski, Ilkka M\"akinen | Scalar curvature operator for models of loop quantum gravity on a
cubical graph | v3: 43 pages, 5 figures. A few minor corrections. Expanded discussion
in section 5.2. Version accepted for publication. v2: 41 pages, 5 figures.
Major revision correcting an error in the previous version. v1: 30 pages, 3
figures | null | 10.1103/PhysRevD.106.046013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we introduce a new operator representing the
three-dimensional scalar curvature in loop quantum gravity. Our construction
does not apply to the entire kinematical Hilbert space of loop quantum gravity;
instead, the operator is defined on the Hilbert space of a fixed cubical graph.
The starting point o... | [
{
"created": "Wed, 20 Oct 2021 17:18:46 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2022 18:25:17 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Jun 2023 12:04:41 GMT",
"version": "v3"
}
] | 2023-06-02 | [
[
"Lewandowski",
"Jerzy",
""
],
[
"Mäkinen",
"Ilkka",
""
]
] | In this article we introduce a new operator representing the three-dimensional scalar curvature in loop quantum gravity. Our construction does not apply to the entire kinematical Hilbert space of loop quantum gravity; instead, the operator is defined on the Hilbert space of a fixed cubical graph. The starting point of ... |
1709.03798 | Tapobrata Sarkar | Kaushik Bhattacharya, Dipanjan Dey, Arindam Mazumdar, Tapobrata Sarkar | New class of naked singularities and their observational signatures | Substantial modifications in the results. Present version is fully
re-written, and the title is also changed. 24 pages, 10 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By imposing suitable junction conditions on a space-like hyper-surface, we
obtain a two-parameter family of possible static configurations from
gravitational collapse. These exemplify a new class of naked singularities. We
show that these admit a consistent description via a two-fluid model, one of
which might be dus... | [
{
"created": "Tue, 12 Sep 2017 12:19:01 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2017 14:07:14 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jan 2018 12:07:52 GMT",
"version": "v3"
},
{
"created": "Sat, 8 Feb 2020 12:48:52 GMT",
"version": "v4"
}
] | 2020-02-11 | [
[
"Bhattacharya",
"Kaushik",
""
],
[
"Dey",
"Dipanjan",
""
],
[
"Mazumdar",
"Arindam",
""
],
[
"Sarkar",
"Tapobrata",
""
]
] | By imposing suitable junction conditions on a space-like hyper-surface, we obtain a two-parameter family of possible static configurations from gravitational collapse. These exemplify a new class of naked singularities. We show that these admit a consistent description via a two-fluid model, one of which might be dust.... |
gr-qc/9612036 | Arvind Borde | Arvind Borde and Alexander Vilenkin | Singularities in Inflationary Cosmology: A Review | Plain TeX. Twelve pages, five figures (that will automatically appear
if you use "dvips" to print the file) | Int.J.Mod.Phys.D5:813-824,1996 | 10.1142/S0218271896000497 | null | gr-qc | null | We review here some recent results that show that inflationary cosmological
models must contain initial singularities. We also present a new singularity
theorem. The question of the initial singularity re-emerges in inflationary
cosmology because inflation is known to be generically future-eternal. It is
natural to a... | [
{
"created": "Sun, 15 Dec 1996 00:29:07 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Borde",
"Arvind",
""
],
[
"Vilenkin",
"Alexander",
""
]
] | We review here some recent results that show that inflationary cosmological models must contain initial singularities. We also present a new singularity theorem. The question of the initial singularity re-emerges in inflationary cosmology because inflation is known to be generically future-eternal. It is natural to ask... |
gr-qc/9604056 | null | Masayuki Tanimoto, Tatsuhiko Koike, and Akio Hosoya | Dynamics of compact homogeneous universes | 32 pages with 2 figures (LaTeX with epsf macro package) | J.Math.Phys. 38 (1997) 350-368 | 10.1063/1.531853 | TIT/HEP-322/COSMO-68 | gr-qc | null | A complete description of dynamics of compact locally homogeneous universes
is given, which, in particular, includes explicit calculations of Teichm\"uller
deformations and careful counting of dynamical degrees of freedom. We regard
each of the universes as a simply connected four dimensional spacetime with
identific... | [
{
"created": "Wed, 1 May 1996 09:59:26 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jul 1996 17:04:47 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Tanimoto",
"Masayuki",
""
],
[
"Koike",
"Tatsuhiko",
""
],
[
"Hosoya",
"Akio",
""
]
] | A complete description of dynamics of compact locally homogeneous universes is given, which, in particular, includes explicit calculations of Teichm\"uller deformations and careful counting of dynamical degrees of freedom. We regard each of the universes as a simply connected four dimensional spacetime with identificat... |
gr-qc/0104035 | S. Antoci | S. Antoci, D.-E. Liebscher and L. Mihich | Revisiting Weyl's calculation of the gravitational pull in Bach's
two-body solution | 11 pages, 2 figures. Text to appear in Classical and Quantum Gravity | Class.Quant.Grav. 18 (2001) 3463-3472 | 10.1088/0264-9381/18/17/307 | null | gr-qc | null | When the mass of one of the two bodies tends to zero, Weyl's definition of
the gravitational force in an axially symmetric, static two-body solution can
be given an invariant formulation in terms of a force four-vector. The norm of
this force is calculated for Bach's two-body solution, that is known to be in
one-to-o... | [
{
"created": "Thu, 12 Apr 2001 13:24:50 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2001 09:05:26 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Antoci",
"S.",
""
],
[
"Liebscher",
"D. -E.",
""
],
[
"Mihich",
"L.",
""
]
] | When the mass of one of the two bodies tends to zero, Weyl's definition of the gravitational force in an axially symmetric, static two-body solution can be given an invariant formulation in terms of a force four-vector. The norm of this force is calculated for Bach's two-body solution, that is known to be in one-to-one... |
gr-qc/9510033 | Nicholas Landsman | N.P. Landsman (DAMTP, Cambridge) | Against the Wheeler-DeWitt equation | 12 pages, LaTeX; revised version corrects treatment of open
minisuperspace model. No conclusions are affected by this | Class.Quant.Grav. 12 (1995) L119-L124 | 10.1088/0264-9381/12/12/003 | null | gr-qc | null | The ADM approach to canonical general relativity combined with Dirac's method
of quantizing constrained systems leads to the Wheeler-DeWitt equation. A
number of mathematical as well as physical difficulties that arise in
connection with this equation may be circumvented if one employs a covariant
Hamiltonian method ... | [
{
"created": "Tue, 17 Oct 1995 11:12:15 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 1995 13:33:10 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Landsman",
"N. P.",
"",
"DAMTP, Cambridge"
]
] | The ADM approach to canonical general relativity combined with Dirac's method of quantizing constrained systems leads to the Wheeler-DeWitt equation. A number of mathematical as well as physical difficulties that arise in connection with this equation may be circumvented if one employs a covariant Hamiltonian method in... |
1711.03199 | Jonas Mureika | Luciano Manfredi, Jonas Mureika, John Moffat | Quasinormal Modes of Modified Gravity (MOG) Black Holes | null | Phys. Lett. B779 (2018) 492-497 | 10.1016/j.physletb.2017.11.006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Quasinormal modes (QNMs) for gravitational and electromagnetic
perturbations are calculated in a Scalar-Tensor-Vector (Modified Gravity)
spacetime, which was initially proposed to obtain correct dynamics of galaxies
and galaxy clusters without the need for dark matter. It is found that for the
increasing model pa... | [
{
"created": "Wed, 8 Nov 2017 22:52:59 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2018 17:02:36 GMT",
"version": "v2"
}
] | 2018-04-18 | [
[
"Manfredi",
"Luciano",
""
],
[
"Mureika",
"Jonas",
""
],
[
"Moffat",
"John",
""
]
] | The Quasinormal modes (QNMs) for gravitational and electromagnetic perturbations are calculated in a Scalar-Tensor-Vector (Modified Gravity) spacetime, which was initially proposed to obtain correct dynamics of galaxies and galaxy clusters without the need for dark matter. It is found that for the increasing model para... |
1005.5397 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | Horizons and singularity in Clifton's spherical solution of f(R) vacuum | 12 pages, LaTeX, 1 figure. Written for the proceedings of the
workshop "Cosmology, Quantum Vacuum and Zeta Functions" in honour of
Professor Emilio Elizalde's 60th birthday, Barcelona, March 8-10, 2010, | null | 10.1007/978-3-642-19760-4_16 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Due to the failure of Birkhoff's theorem, black holes in f(R) gravity
theories in which an effective time-varying cosmological "constant" is present
are, in general, dynamical. Clifton's exact spherical solution of R^(1+\delta)
gravity, which is dynamical and describes a central object embedded in a
spatially flat un... | [
{
"created": "Fri, 28 May 2010 20:35:56 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | Due to the failure of Birkhoff's theorem, black holes in f(R) gravity theories in which an effective time-varying cosmological "constant" is present are, in general, dynamical. Clifton's exact spherical solution of R^(1+\delta) gravity, which is dynamical and describes a central object embedded in a spatially flat univ... |
1711.11375 | Gonzalo Quiroga | C. N Kozameh, J. I. Nieva, and Gonzalo D Quiroga | Spin and Center of mass comparison between the PN approach and the
asymptotic formulation | null | Phys. Rev. D 98, 064005 (2018) | 10.1103/PhysRevD.98.064005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we analyse the similarities and differences between the
equations of motion for the center of mass and intrinsic angular momentum for
isolated sources of gravitational radiation obtained by two different
formulations. One approach is based on the asymptotic formulation of the GR
whereas the other relies ... | [
{
"created": "Thu, 30 Nov 2017 13:20:36 GMT",
"version": "v1"
}
] | 2018-09-12 | [
[
"Kozameh",
"C. N",
""
],
[
"Nieva",
"J. I.",
""
],
[
"Quiroga",
"Gonzalo D",
""
]
] | In this work we analyse the similarities and differences between the equations of motion for the center of mass and intrinsic angular momentum for isolated sources of gravitational radiation obtained by two different formulations. One approach is based on the asymptotic formulation of the GR whereas the other relies on... |
2405.08872 | Ra\'ul Carballo-Rubio | Ra\'ul Carballo-Rubio and Astrid Eichhorn | Black hole horizons must be veiled by photon spheres | 10 pages, 2 figures, Honorable Mention in the Gravity Research
Foundation 2024 Awards for Essays on Gravitation | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Horizons and bound photon orbits are defining features of black holes that
translate into key features of black hole images. We present a purely geometric
proof that spherically symmetric, isolated objects with horizons in gravity
theories with null-geodesic propagation of light must display bound photon
orbits formi... | [
{
"created": "Tue, 14 May 2024 18:00:03 GMT",
"version": "v1"
}
] | 2024-05-16 | [
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Eichhorn",
"Astrid",
""
]
] | Horizons and bound photon orbits are defining features of black holes that translate into key features of black hole images. We present a purely geometric proof that spherically symmetric, isolated objects with horizons in gravity theories with null-geodesic propagation of light must display bound photon orbits forming... |
1907.02334 | Yurii Ignat'ev | Yu. G. Ignat'ev and I. A. Kokh | Qualitative and Numerical Analysis of a Cosmological Model Based on an
Asymmetric Scalar Doublet with Minimal Couplings. I. Qualitative Analysis of
the Model | 12 pages, 2 figures, 3 references | Russian Physics Journal,Vol. 61, No. 6, 2018, pp. 1079-1092 | 10.1007/s11182-018-1500-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A qualitative analysis of a cosmological model based on the asymmetric scalar
doublet classical + phantom scalar field with minimal interaction is performed.
It is shown that depending on the parameters of the model, the corresponding
dynamical system can have 1, 3, or 9 stationary points corresponding to
attractive ... | [
{
"created": "Thu, 4 Jul 2019 11:41:42 GMT",
"version": "v1"
}
] | 2019-07-05 | [
[
"Ignat'ev",
"Yu. G.",
""
],
[
"Kokh",
"I. A.",
""
]
] | A qualitative analysis of a cosmological model based on the asymmetric scalar doublet classical + phantom scalar field with minimal interaction is performed. It is shown that depending on the parameters of the model, the corresponding dynamical system can have 1, 3, or 9 stationary points corresponding to attractive or... |
1101.5401 | Rahmede Christoph | Mark Hindmarsh, Daniel Litim, Christoph Rahmede | Asymptotically Safe Cosmology | 8 pages; v2: explanations and references added, accepted for
publication in JCAP | JCAP 1107:019,2011 | 10.1088/1475-7516/2011/07/019 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quantum modifications to cosmology in a Friedmann-Robertson-Walker
universe with and without scalar fields by taking the renormalisation group
running of gravitational and matter couplings into account. We exploit the
Bianchi identity to relate the renormalisation group scale with scale factor
and derive the... | [
{
"created": "Thu, 27 Jan 2011 21:37:50 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jun 2011 13:54:33 GMT",
"version": "v2"
}
] | 2011-07-14 | [
[
"Hindmarsh",
"Mark",
""
],
[
"Litim",
"Daniel",
""
],
[
"Rahmede",
"Christoph",
""
]
] | We study quantum modifications to cosmology in a Friedmann-Robertson-Walker universe with and without scalar fields by taking the renormalisation group running of gravitational and matter couplings into account. We exploit the Bianchi identity to relate the renormalisation group scale with scale factor and derive the i... |
0810.2161 | Chopin Soo | Chun-Yu Lin, Chopin Soo | Generalized Painlev\'e-Gullstrand metrics | Typos corrected, additional footnotes | Phys.Lett.B671:493-495,2009 | 10.1016/j.physletb.2008.12.051 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An obstruction to the implementation of spatially flat
Painleve-Gullstrand(PG) slicings is demonstrated, and explicitly discussed for
Reissner-Nordstrom and Schwarzschild-anti-deSitter spacetimes. Generalizations
of PG slicings which are not spatially flat but which remain regular at the
horizons are introduced. Thes... | [
{
"created": "Mon, 13 Oct 2008 13:30:16 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jan 2009 05:12:23 GMT",
"version": "v2"
}
] | 2009-02-02 | [
[
"Lin",
"Chun-Yu",
""
],
[
"Soo",
"Chopin",
""
]
] | An obstruction to the implementation of spatially flat Painleve-Gullstrand(PG) slicings is demonstrated, and explicitly discussed for Reissner-Nordstrom and Schwarzschild-anti-deSitter spacetimes. Generalizations of PG slicings which are not spatially flat but which remain regular at the horizons are introduced. These ... |
1512.05860 | Rabin Banerjee | Rabin Banerjee, Pradip Mukherjee | Comment on "Thermal Hall Effect and Geometry with Torsion" | LaTeX, 2 pages, expanded with new input | null | null | null | gr-qc cond-mat.other hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a comment on a paper by Gromov and Abanov [Phys. Rev. Lett. 114,
016802 (2015)]. We will show that there is an inconsistency which renders the
results untenable.
| [
{
"created": "Fri, 18 Dec 2015 06:34:24 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jul 2016 07:51:04 GMT",
"version": "v2"
}
] | 2016-07-07 | [
[
"Banerjee",
"Rabin",
""
],
[
"Mukherjee",
"Pradip",
""
]
] | This is a comment on a paper by Gromov and Abanov [Phys. Rev. Lett. 114, 016802 (2015)]. We will show that there is an inconsistency which renders the results untenable. |
2304.09080 | Salim Shekh Dr. | S. H. Shekh, M. Muzammil, R. V. Mapari, G. U. Khapekar, A. Dixit | Holographic inflation in non-static plane symmetric space-time | 15-pages; 13-figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current analysis uses the non-static plane symmetric space-time to
dynamically examine the holographic dark energy model as a candidates of IR
cut-offs (specifically Hubble's and Granda-Oliveros cut-off). Using the Markov
Chain Monte Carlo (MCMC) method, we estimate the best fit values for the model
parameters im... | [
{
"created": "Sun, 16 Apr 2023 09:11:37 GMT",
"version": "v1"
}
] | 2023-04-19 | [
[
"Shekh",
"S. H.",
""
],
[
"Muzammil",
"M.",
""
],
[
"Mapari",
"R. V.",
""
],
[
"Khapekar",
"G. U.",
""
],
[
"Dixit",
"A.",
""
]
] | The current analysis uses the non-static plane symmetric space-time to dynamically examine the holographic dark energy model as a candidates of IR cut-offs (specifically Hubble's and Granda-Oliveros cut-off). Using the Markov Chain Monte Carlo (MCMC) method, we estimate the best fit values for the model parameters impo... |
gr-qc/0509007 | Andreas W. Aste | Andreas Aste, Dirk Trautmann | Radial fall of a test particle onto an evaporating black hole | 6 pages, 3 figures, LATEX | Can.J.Phys. 83 (2005) 1001-1006 | 10.1139/p05-058 | null | gr-qc | null | A test particle falling into a classical black hole crosses the event horizon
and ends up in the singularity within finite eigentime. In the `more realistic'
case of a `classical' evaporating black hole, an observer falling onto a black
hole observes a sudden evaporation of the hole. This illustrates the fact that
th... | [
{
"created": "Thu, 1 Sep 2005 12:36:36 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Aste",
"Andreas",
""
],
[
"Trautmann",
"Dirk",
""
]
] | A test particle falling into a classical black hole crosses the event horizon and ends up in the singularity within finite eigentime. In the `more realistic' case of a `classical' evaporating black hole, an observer falling onto a black hole observes a sudden evaporation of the hole. This illustrates the fact that the ... |
1309.2670 | Grasiele Batista Dos Santos | N. Pinto-Neto, G. B. Santos and W. Struyve | Quantum-to-classical transition of primordial cosmological perturbations
in de Broglie-Bohm quantum theory: the bouncing scenario | 5 pages, no figures, revtex4 | Physical Review D 89, 023517 (2014) | 10.1103/PhysRevD.89.023517 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous work we have exhibited a clear description of the
quantum-to-classical transition of cosmological quantum fluctuations in the
inflationary scenario using the de Broglie-Bohm quantum theory. These
fluctuations are believed to seed the small inhomogeneities, which are then
responsible for the formation of... | [
{
"created": "Tue, 10 Sep 2013 21:01:50 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 2013 13:14:49 GMT",
"version": "v2"
}
] | 2014-01-21 | [
[
"Pinto-Neto",
"N.",
""
],
[
"Santos",
"G. B.",
""
],
[
"Struyve",
"W.",
""
]
] | In a previous work we have exhibited a clear description of the quantum-to-classical transition of cosmological quantum fluctuations in the inflationary scenario using the de Broglie-Bohm quantum theory. These fluctuations are believed to seed the small inhomogeneities, which are then responsible for the formation of l... |
1609.06358 | Andrei Lebed G | Andrei G. Lebed | Breakdown of the equivalence between active gravitational mass and
energy for a quantum body | 4 pages | Journal of Physics: Conference Series, vol. 738, 012036 (2016) | 10.1088/1742-6596/738/1/012036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine active gravitational mass operator of the simplest composite
quantum body - a hydrogen atom - within the semiclassical approach to the
Einstein equation for a gravitational field. We show that the expectation value
of the mass is equivalent to energy for stationary quantum states. On the other
hand, it o... | [
{
"created": "Tue, 20 Sep 2016 21:11:29 GMT",
"version": "v1"
}
] | 2016-09-28 | [
[
"Lebed",
"Andrei G.",
""
]
] | We determine active gravitational mass operator of the simplest composite quantum body - a hydrogen atom - within the semiclassical approach to the Einstein equation for a gravitational field. We show that the expectation value of the mass is equivalent to energy for stationary quantum states. On the other hand, it occ... |
1901.06994 | Ion I. Cotaescu | Ion I. Cotaescu and Ion Cotaescu Jr | Integral representation of the scalar propagators on the de Sitter
expanding universe | 11 pages, 1 figure | Eur. Phys. J. C (2019) 79:671 | 10.1140/epjc/s10052-019-7180-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new type of integral representation is proposed for the propagators of the
massive Klein-Gordon field minimally coupled to the gravity of the de Sitter
expanding universe. This representation encapsulates the effects of the
Heaviside step functions of the Feynman propagators making possible for the
first time the c... | [
{
"created": "Mon, 21 Jan 2019 16:32:59 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2019 08:26:20 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Jan 2019 08:26:53 GMT",
"version": "v3"
},
{
"created": "Thu, 6 Jun 2019 13:31:08 GMT",
"version": "v4"
},
{
"cr... | 2021-01-15 | [
[
"Cotaescu",
"Ion I.",
""
],
[
"Cotaescu",
"Ion",
"Jr"
]
] | A new type of integral representation is proposed for the propagators of the massive Klein-Gordon field minimally coupled to the gravity of the de Sitter expanding universe. This representation encapsulates the effects of the Heaviside step functions of the Feynman propagators making possible for the first time the cal... |
1709.06512 | Amir Hadi Ziaie | Hamid Shabani and Amir Hadi Ziaie | Static Vacuum Solutions on Curved Spacetimes with Torsion | 25 pages, 3 figures | Int. J. Mod. Phys. A 33 1850095 (2018) | 10.1142/S0217751X18500951 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein-Cartan-Kibble-Sciama ({\sf ECKS}) theory of gravity naturally
extends Einstein\rq{}s general relativity ({\sf GR}) to include intrinsic
angular momentum (spin) of matter. The main feature of this theory consists of
an algebraic relation between spacetime torsion and spin of matter which indeed
deprives t... | [
{
"created": "Tue, 19 Sep 2017 16:27:44 GMT",
"version": "v1"
},
{
"created": "Thu, 31 May 2018 21:27:24 GMT",
"version": "v2"
}
] | 2018-06-04 | [
[
"Shabani",
"Hamid",
""
],
[
"Ziaie",
"Amir Hadi",
""
]
] | The Einstein-Cartan-Kibble-Sciama ({\sf ECKS}) theory of gravity naturally extends Einstein\rq{}s general relativity ({\sf GR}) to include intrinsic angular momentum (spin) of matter. The main feature of this theory consists of an algebraic relation between spacetime torsion and spin of matter which indeed deprives the... |
2307.16161 | Kemal G\"ultekin | Kemal G\"ultekin | Bose-Einstein Condensation and Black Holes in Dark Matter and Dark
Energy | Ph.D thesis; 86 pages; 8 figures | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The main aim of this study is to reveal curved space and particle physics
effects on the formation of Bose-Einstein condensate (BEC) scalar fields in
cosmology and around a black hole. Cosmological scalar fields for dark energy
and dark matter may be considered as a result of Bose-Einstein condensation. In
this regar... | [
{
"created": "Sun, 30 Jul 2023 08:08:18 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Aug 2023 10:51:48 GMT",
"version": "v2"
}
] | 2023-08-11 | [
[
"Gültekin",
"Kemal",
""
]
] | The main aim of this study is to reveal curved space and particle physics effects on the formation of Bose-Einstein condensate (BEC) scalar fields in cosmology and around a black hole. Cosmological scalar fields for dark energy and dark matter may be considered as a result of Bose-Einstein condensation. In this regard,... |
1707.00862 | Eduard Mychelkin G. | Eduard G. Mychelkin and Maxim A. Makukov | Unified geometrical basis for the generalized Ehlers identities and
Raychaudhuri equations | Accepted in Reports on Mathematical Physics | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the timelike, spacelike and null versions of the Ehlers
identity, as well as ensuing Raychaudhuri equations, might be all derived
within a single geometrical approach based on the definition of the Riemann
curvature tensor specified with respect to the corresponding congruence. Still,
spacelike and n... | [
{
"created": "Tue, 4 Jul 2017 09:03:01 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2017 06:32:25 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Oct 2017 13:08:58 GMT",
"version": "v3"
}
] | 2017-10-31 | [
[
"Mychelkin",
"Eduard G.",
""
],
[
"Makukov",
"Maxim A.",
""
]
] | It is shown that the timelike, spacelike and null versions of the Ehlers identity, as well as ensuing Raychaudhuri equations, might be all derived within a single geometrical approach based on the definition of the Riemann curvature tensor specified with respect to the corresponding congruence. Still, spacelike and nul... |
2408.03683 | Santosh Lohakare | Santosh V Lohakare, Soumyadip Niyogi, and B. Mishra | Cosmology in Modified $f(\mathcal{G})$ Gravity: A Late Time Cosmic
Phenomena | 15 pages, 8 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have introduced a numerical method for solving the
Friedmann equations of modified $f(\mathcal{G})$ gravity in the presence of
pressureless matter, enabling us to predict the redshift behavior of the Hubble
expansion rate. To evaluate the credibility of the model, we applied a Bayesian
MCMC techniqu... | [
{
"created": "Wed, 7 Aug 2024 10:51:09 GMT",
"version": "v1"
}
] | 2024-08-08 | [
[
"Lohakare",
"Santosh V",
""
],
[
"Niyogi",
"Soumyadip",
""
],
[
"Mishra",
"B.",
""
]
] | In this paper, we have introduced a numerical method for solving the Friedmann equations of modified $f(\mathcal{G})$ gravity in the presence of pressureless matter, enabling us to predict the redshift behavior of the Hubble expansion rate. To evaluate the credibility of the model, we applied a Bayesian MCMC technique ... |
2106.12050 | Teodor Borislavov Vasilev | Teodor Borislavov Vasilev, Mariam Bouhmadi-L\'opez and Prado
Mart\'in-Moruno | Classical and quantum $f(R)$ cosmology: The big rip, the little rip and
the little sibling of the big rip | Invited review submitted to Universe for the Special Issue on
"Quantum Cosmology", ed. by Prof. Paulo Vargas Moniz, 32 pages, 3 tables. v2:
typos fixed, references added, matches published version | Universe 7 (2021) no.8, 288 | 10.3390/universe7080288 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The big rip, the little rip and the little sibling of the big rip are
cosmological doomsdays predicted by some phantom dark energy models that could
describe the future evolution of our Universe. When the universe evolves
towards either of these future cosmic events all bounded structures and,
ultimately, space-time ... | [
{
"created": "Tue, 22 Jun 2021 20:14:51 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2021 13:45:02 GMT",
"version": "v2"
}
] | 2021-09-27 | [
[
"Vasilev",
"Teodor Borislavov",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Martín-Moruno",
"Prado",
""
]
] | The big rip, the little rip and the little sibling of the big rip are cosmological doomsdays predicted by some phantom dark energy models that could describe the future evolution of our Universe. When the universe evolves towards either of these future cosmic events all bounded structures and, ultimately, space-time it... |
1004.1505 | Lorenzo Sebastiani | Olesya Gorbunova and Lorenzo Sebastiani | Viscous Fluids and Gauss-Bonnet Modified Gravity | 14 pages | Gen.Rel.Grav.42:2873-2890,2010 | 10.1007/s10714-010-1031-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study effects of cosmic fluids on finite-time future singularities in
modified $f(R,G)$-gravity, where $R$ and $G$ are the Ricci scalar and the
Gauss-Bonnet invariant, respectively. We consider the fluid equation of state
in the general form, $\omega=\omega(\rho)$, and we suppose the existence of a
bulk viscosity.... | [
{
"created": "Fri, 9 Apr 2010 09:21:47 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jun 2010 14:02:17 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Nov 2010 16:13:42 GMT",
"version": "v3"
}
] | 2010-11-15 | [
[
"Gorbunova",
"Olesya",
""
],
[
"Sebastiani",
"Lorenzo",
""
]
] | We study effects of cosmic fluids on finite-time future singularities in modified $f(R,G)$-gravity, where $R$ and $G$ are the Ricci scalar and the Gauss-Bonnet invariant, respectively. We consider the fluid equation of state in the general form, $\omega=\omega(\rho)$, and we suppose the existence of a bulk viscosity. W... |
1706.02354 | Marek Szydlowski | Marek Szydlowski and Aleksander Stachowski | Is a pole type singularity an alternative to inflation? | RevTeX 4.1; 33 pages, 9 figures; ver. 2: new title, new part on the
pole type singularities with inflation | Eur. Phys. J. C78, 552 (2018) | 10.1140/epjc/s10052-018-6036-1 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we apply a method of reducing the dynamics of FRW cosmological
models with the barotropic form of the equation of state to the dynamical
system of the Newtonian type to detect the finite scale factor singularities
and the finite-time singularities. In this approach all information concerning
the dynami... | [
{
"created": "Wed, 7 Jun 2017 19:29:26 GMT",
"version": "v1"
},
{
"created": "Mon, 21 May 2018 17:26:58 GMT",
"version": "v2"
}
] | 2019-09-27 | [
[
"Szydlowski",
"Marek",
""
],
[
"Stachowski",
"Aleksander",
""
]
] | In this paper, we apply a method of reducing the dynamics of FRW cosmological models with the barotropic form of the equation of state to the dynamical system of the Newtonian type to detect the finite scale factor singularities and the finite-time singularities. In this approach all information concerning the dynamics... |
1103.3092 | Kouji Nakamura | Kouji Nakamura | Alternative construction of gauge-invariant variables for linear metric
perturbation on general background spacetime | 8 pages, no figure | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Construction of the gauge-invariant variables for the linear metric
perturbation, which was proposed in the paper [K. Nakamura, arXiv:1101.1147],
is discussed through an alternative approach. Our starting point of the
construction of the gauge-invariant variables is an non-trivial non-local
decomposition of the linea... | [
{
"created": "Wed, 16 Mar 2011 04:19:46 GMT",
"version": "v1"
}
] | 2011-03-17 | [
[
"Nakamura",
"Kouji",
""
]
] | Construction of the gauge-invariant variables for the linear metric perturbation, which was proposed in the paper [K. Nakamura, arXiv:1101.1147], is discussed through an alternative approach. Our starting point of the construction of the gauge-invariant variables is an non-trivial non-local decomposition of the linear ... |
1705.01252 | James O'Brien | James G. O'Brien, Thomas L. Chiarelli, Jeremy Dentico, Modestas
Stulge, Brian Stefanski, Robert Moss and Spasen Chaykov | Alternative gravity rotation curves for the Little Things Survey | 13 Pages, 7 Figures, Accepted in Astrophysical Journal | null | 10.3847/1538-4357/aa99e1 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Galactic rotation curves have proven to be the testing ground for dark matter
bounds in spiral galaxies of all morphologies. Dwarf galaxies serve as an
increasingly interesting case of rotation curve dynamics due to their typically
rising rotation curve as opposed to the flattening curve of large spirals.
These galax... | [
{
"created": "Wed, 3 May 2017 04:44:36 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2017 15:11:57 GMT",
"version": "v2"
}
] | 2018-01-10 | [
[
"O'Brien",
"James G.",
""
],
[
"Chiarelli",
"Thomas L.",
""
],
[
"Dentico",
"Jeremy",
""
],
[
"Stulge",
"Modestas",
""
],
[
"Stefanski",
"Brian",
""
],
[
"Moss",
"Robert",
""
],
[
"Chaykov",
"Spasen",
""
... | Galactic rotation curves have proven to be the testing ground for dark matter bounds in spiral galaxies of all morphologies. Dwarf galaxies serve as an increasingly interesting case of rotation curve dynamics due to their typically rising rotation curve as opposed to the flattening curve of large spirals. These galaxie... |
gr-qc/9801011 | Leonid Grishchuk | L P Grishchuk | Comment on the "Influence of Cosmological Transitions on the Evolution
of Density Perturbations" | 15 pages, revised in connection with remarks of a neutral referee | null | null | null | gr-qc astro-ph hep-ph | null | A recent paper by Martin and Schwarz [1] argues that the ``standard
inflationary result" has been finally proven. The result itself is formulated
as: ``the closer the inflationary epoch is to the de Sitter space-time, the
less important are large-scale gravitational waves in the CMBR today".
Beginning from the basic ... | [
{
"created": "Tue, 6 Jan 1998 14:58:48 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Jan 1998 17:37:53 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Sep 1999 11:27:37 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Grishchuk",
"L P",
""
]
] | A recent paper by Martin and Schwarz [1] argues that the ``standard inflationary result" has been finally proven. The result itself is formulated as: ``the closer the inflationary epoch is to the de Sitter space-time, the less important are large-scale gravitational waves in the CMBR today". Beginning from the basic eq... |
2309.02678 | Muhammad Sharif | M. Sharif and K. Hassan | Analysis of Complexity Factor for Charged Dissipative Configuration in
Modified Gravity | 28 pages, no figure | Eur. Phys. J. Plus 138(2023)787 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we determine the electromagnetic effects on the complexity
factor of radiating anisotropic cylindrical geometry in the background of
$f(G,\mathcal{T})$ theory. The self-gravitating objects possessing
inhomogeneous energy density, pressure anisotropy, heat flux, charge and
correction terms appear to enc... | [
{
"created": "Wed, 6 Sep 2023 03:12:13 GMT",
"version": "v1"
}
] | 2023-09-07 | [
[
"Sharif",
"M.",
""
],
[
"Hassan",
"K.",
""
]
] | In this paper, we determine the electromagnetic effects on the complexity factor of radiating anisotropic cylindrical geometry in the background of $f(G,\mathcal{T})$ theory. The self-gravitating objects possessing inhomogeneous energy density, pressure anisotropy, heat flux, charge and correction terms appear to encou... |
2108.07069 | Daniela Pugliese Dr | D. Pugliese, Z. Stuchlik | General relativistic rotational energy extraction from black
holes-accretion disk systems | Published in: Class.Quant.Grav. 38 (2021) 14, 145014 | Class.Quant.Grav. 38 (2021) 14, 145014 | 10.1088/1361-6382/abff97 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We constrain the BHs spin with the evaluation of the dimensionless parameter
\xi, the total rotational energy extracted versus the BH mass. The energy
extraction can power an outflow which can be then observed. We relate the
energy extraction to the accreting configurations and the accretion processes
occurring in a ... | [
{
"created": "Mon, 16 Aug 2021 13:03:51 GMT",
"version": "v1"
}
] | 2021-08-17 | [
[
"Pugliese",
"D.",
""
],
[
"Stuchlik",
"Z.",
""
]
] | We constrain the BHs spin with the evaluation of the dimensionless parameter \xi, the total rotational energy extracted versus the BH mass. The energy extraction can power an outflow which can be then observed. We relate the energy extraction to the accreting configurations and the accretion processes occurring in a cl... |
0810.4515 | James Lindesay | James Lindesay | Quantum Behaviors on an Excreting Black Hole | 33 pages, 14 figures | Class.Quant.Grav.26:125014,2009 | 10.1088/0264-9381/26/12/125014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Often, geometries with horizons offer insights into the intricate
relationships between general relativity and quantum physics. However, some
subtle aspects of gravitating quantum systems might be difficult to ascertain
using static backgrounds, since quantum mechanics incorporates dynamic
measurability constraints (... | [
{
"created": "Fri, 24 Oct 2008 17:39:35 GMT",
"version": "v1"
}
] | 2009-11-19 | [
[
"Lindesay",
"James",
""
]
] | Often, geometries with horizons offer insights into the intricate relationships between general relativity and quantum physics. However, some subtle aspects of gravitating quantum systems might be difficult to ascertain using static backgrounds, since quantum mechanics incorporates dynamic measurability constraints (su... |
2309.16107 | Daniel Mata-Pacheco | H. Garcia-Compean, D. Mata-Pacheco | Scalar field inflation driven by a modification of the Heisenberg
algebra | 36 pages, 1 figure. All sections were improved. References added | null | 10.1142/S0218271824500378 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the modifications induced on scalar field inflation produced by
considering a general modification of the Heisenberg algebra. We proceed by
modifying the Poisson brackets on the classical theory whenever the
corresponding quantum commutator is modified. We do not restrict ourselves to a
specific form for suc... | [
{
"created": "Thu, 28 Sep 2023 02:18:16 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Aug 2024 16:49:45 GMT",
"version": "v2"
}
] | 2024-08-13 | [
[
"Garcia-Compean",
"H.",
""
],
[
"Mata-Pacheco",
"D.",
""
]
] | We study the modifications induced on scalar field inflation produced by considering a general modification of the Heisenberg algebra. We proceed by modifying the Poisson brackets on the classical theory whenever the corresponding quantum commutator is modified. We do not restrict ourselves to a specific form for such ... |
2103.01182 | Sotirios Karamitsos | Alexandros Karam, Sotirios Karamitsos, Margus Saal | $\beta$-function reconstruction of Palatini inflationary attractors | 26 pages, 2 figures | null | 10.1088/1475-7516/2021/10/068 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Attractor inflation is a particularly robust framework for developing
inflationary models that are insensitive to the details of the potential. Such
models are most often considered in the metric formulation of gravity. However,
non-minimal models may not necessarily maintain their attractor nature in the
Palatini fo... | [
{
"created": "Mon, 1 Mar 2021 18:27:41 GMT",
"version": "v1"
}
] | 2021-11-03 | [
[
"Karam",
"Alexandros",
""
],
[
"Karamitsos",
"Sotirios",
""
],
[
"Saal",
"Margus",
""
]
] | Attractor inflation is a particularly robust framework for developing inflationary models that are insensitive to the details of the potential. Such models are most often considered in the metric formulation of gravity. However, non-minimal models may not necessarily maintain their attractor nature in the Palatini form... |
2011.06932 | M. Farasat Shamir | M. Farasat Shamir | Massive Compact Bardeen Stars with Conformal Motion | 12 pages, 6 figures | Phys. Lett. B811(2020)135927 | 10.1016/j.physletb.2020.135927 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The main focus of this paper is to discuss the solutions of
Einstein-Maxwell's field equations for compact stars study. We have chosen the
MIT bag model equation of state for the pressure-energy density relationship
and conformal Killing vectors are used to investigate the appropriate forms for
metric coefficients. W... | [
{
"created": "Thu, 12 Nov 2020 09:16:21 GMT",
"version": "v1"
}
] | 2020-11-16 | [
[
"Shamir",
"M. Farasat",
""
]
] | The main focus of this paper is to discuss the solutions of Einstein-Maxwell's field equations for compact stars study. We have chosen the MIT bag model equation of state for the pressure-energy density relationship and conformal Killing vectors are used to investigate the appropriate forms for metric coefficients. We ... |
2106.08572 | Heba Sami | Heba Sami and Amare Abebe | Cosmic hierarchy in $f(R)$ gravity | 15 pages and 20 figures | null | 10.1142/S0219887822501675 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution, we investigate hierarchical nature of large-scale
structure clustering through the oscillatory nature of the solutions of the
Schr\"{o}dinger-like Friedmann equation in a modified gravitational background
described by the $f(R)$ gravity theory. We find the cosmological solutions to
the Schr\"{o}... | [
{
"created": "Wed, 16 Jun 2021 06:41:43 GMT",
"version": "v1"
}
] | 2022-10-05 | [
[
"Sami",
"Heba",
""
],
[
"Abebe",
"Amare",
""
]
] | In this contribution, we investigate hierarchical nature of large-scale structure clustering through the oscillatory nature of the solutions of the Schr\"{o}dinger-like Friedmann equation in a modified gravitational background described by the $f(R)$ gravity theory. We find the cosmological solutions to the Schr\"{o}di... |
1105.4724 | Carlo Ligi | M. Bassan, B. Buonomo, G. Cavallari, E. Coccia, S. D'Antonio, V.
Fafone, L.G. Foggetta, C. Ligi, A. Marini, G. Mazzitelli, G. Modestino, G.
Pizzella, L. Quintieri, F. Ronga, P. Valente, S. M. Vinko | Vibrational excitation induced by electron beam and cosmic rays in
normal and superconductive aluminum bars | 28 pages, 13 figures | null | 10.1016/j.nima.2011.08.028 | null | gr-qc astro-ph.IM physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report new measurements of the acoustic excitation of an Al5056
superconductive bar when hit by an electron beam, in a previously unexplored
temperature range, down to 0.35 K. These data, analyzed together with previous
results of the RAP experiment obtained for T > 0.54 K, show a vibrational
response enhanced by ... | [
{
"created": "Tue, 24 May 2011 10:25:04 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2011 09:27:08 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Bassan",
"M.",
""
],
[
"Buonomo",
"B.",
""
],
[
"Cavallari",
"G.",
""
],
[
"Coccia",
"E.",
""
],
[
"D'Antonio",
"S.",
""
],
[
"Fafone",
"V.",
""
],
[
"Foggetta",
"L. G.",
""
],
[
"Ligi",
"C.",
... | We report new measurements of the acoustic excitation of an Al5056 superconductive bar when hit by an electron beam, in a previously unexplored temperature range, down to 0.35 K. These data, analyzed together with previous results of the RAP experiment obtained for T > 0.54 K, show a vibrational response enhanced by a ... |
2306.07411 | D\'avid Szepessy | P. Hrask\'o, D. Szepessy | On the Absoluteness of Rotation | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We argue that in the general relativistic calculation of planetary orbits,
the choice of a reference frame which is an obligatory condition in the
Newtonian approach is replaced by an appropriate boundary condition on the
solution of Einstein equation. Implications of this observation on the nature
of rotation and th... | [
{
"created": "Mon, 12 Jun 2023 20:38:41 GMT",
"version": "v1"
}
] | 2023-06-14 | [
[
"Hraskó",
"P.",
""
],
[
"Szepessy",
"D.",
""
]
] | We argue that in the general relativistic calculation of planetary orbits, the choice of a reference frame which is an obligatory condition in the Newtonian approach is replaced by an appropriate boundary condition on the solution of Einstein equation. Implications of this observation on the nature of rotation and the ... |
2303.08153 | Charalampos Markakis | Charalampos Markakis, Sean Bray, An{\i}l Zengino\u{g}lu | Symmetric integration of the 1+1 Teukolsky equation on hyperboloidal
foliations of Kerr spacetimes | 28 pages, 9 figures | null | null | null | gr-qc astro-ph.HE cs.NA math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work outlines a fast, high-precision time-domain solver for scalar,
electromagnetic and gravitational perturbations on hyperboloidal foliations of
Kerr space-times. Time-domain Teukolsky equation solvers have typically used
explicit methods, which numerically violate Noether symmetries and are
Courant-limited. T... | [
{
"created": "Tue, 14 Mar 2023 18:00:28 GMT",
"version": "v1"
}
] | 2023-03-16 | [
[
"Markakis",
"Charalampos",
""
],
[
"Bray",
"Sean",
""
],
[
"Zenginoğlu",
"Anıl",
""
]
] | This work outlines a fast, high-precision time-domain solver for scalar, electromagnetic and gravitational perturbations on hyperboloidal foliations of Kerr space-times. Time-domain Teukolsky equation solvers have typically used explicit methods, which numerically violate Noether symmetries and are Courant-limited. The... |
1102.0016 | Doron Ludwin | Doron ludwin | A Quantum Twin Paradox | 9 pages, 2 figures | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Classical Twin Paradox is widely dealt in literature and neatly resolved.
In addition, it is also well known that, when looking at two systems which are
boosted relative to each other, the concept of the simultaneous effect of a
quantum measurement in space-time causes some discrepancies in the cause-effect
behav... | [
{
"created": "Mon, 31 Jan 2011 21:25:48 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2011 10:10:43 GMT",
"version": "v2"
}
] | 2011-02-10 | [
[
"ludwin",
"Doron",
""
]
] | The Classical Twin Paradox is widely dealt in literature and neatly resolved. In addition, it is also well known that, when looking at two systems which are boosted relative to each other, the concept of the simultaneous effect of a quantum measurement in space-time causes some discrepancies in the cause-effect behavio... |
1001.0575 | Steven L. Liebling | Steven L. Liebling, Luis Lehner, David Neilsen, Carlos Palenzuela | Evolutions of Magnetized and Rotating Neutron Stars | 12 pages, 8 figures | Phys.Rev.D81:124023,2010 | 10.1103/PhysRevD.81.124023 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of magnetized and rigidly rotating neutron stars
within a fully general relativistic implementation of ideal
magnetohydrodynamics with no assumed symmetries in three spatial dimensions.
The stars are modeled as rotating, magnetized polytropic stars and we examine
diverse scenarios to study thei... | [
{
"created": "Mon, 4 Jan 2010 21:04:58 GMT",
"version": "v1"
},
{
"created": "Mon, 24 May 2010 20:08:42 GMT",
"version": "v2"
}
] | 2010-08-24 | [
[
"Liebling",
"Steven L.",
""
],
[
"Lehner",
"Luis",
""
],
[
"Neilsen",
"David",
""
],
[
"Palenzuela",
"Carlos",
""
]
] | We study the evolution of magnetized and rigidly rotating neutron stars within a fully general relativistic implementation of ideal magnetohydrodynamics with no assumed symmetries in three spatial dimensions. The stars are modeled as rotating, magnetized polytropic stars and we examine diverse scenarios to study their ... |
gr-qc/9510036 | Dario Nunez | Dar\'io N\'u\~nez, Hernando Quevedo, and Daniel Sudarsky | How short can the hair of a black hole be? | 8 pages in Latex | null | null | null | gr-qc | null | We show that in all theories in which black hole hair has been discovered,
the region with non-trivial structure of the non-linear matter fields must
extend beyond $3/ 2$ the horizon radius, independently of all other parameters
present in the theory. We argue that this is a universal lower bound that
applies in ever... | [
{
"created": "Tue, 17 Oct 1995 18:27:25 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Núñez",
"Darío",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | We show that in all theories in which black hole hair has been discovered, the region with non-trivial structure of the non-linear matter fields must extend beyond $3/ 2$ the horizon radius, independently of all other parameters present in the theory. We argue that this is a universal lower bound that applies in every ... |
2005.14481 | Hiroaki Tahara | Hiroaki W. H. Tahara, Tsutomu Kobayashi and Jun'ichi Yokoyama | A new mechanism for freezing extra dimensions with higher-order
curvature terms | 6 pages | null | 10.1016/j.physletb.2020.135857 | RUP-20-17, RESCEU-9/20 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a model of higher dimensional cosmology in which extra
dimensions are frozen by virtue of the cubic-order Lovelock gravity throughout
the cosmic history from inflation to the present with radiation and
matter-dominated regimes in between.
| [
{
"created": "Fri, 29 May 2020 09:57:30 GMT",
"version": "v1"
}
] | 2020-10-21 | [
[
"Tahara",
"Hiroaki W. H.",
""
],
[
"Kobayashi",
"Tsutomu",
""
],
[
"Yokoyama",
"Jun'ichi",
""
]
] | We construct a model of higher dimensional cosmology in which extra dimensions are frozen by virtue of the cubic-order Lovelock gravity throughout the cosmic history from inflation to the present with radiation and matter-dominated regimes in between. |
1506.08073 | Garrett Lisi | A. Garrett Lisi | Lie Group Cosmology | 42 pages, 1 figure; v2: minor corrections | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our universe is a deforming Lie group.
| [
{
"created": "Wed, 24 Jun 2015 20:01:11 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Sep 2015 18:08:39 GMT",
"version": "v2"
}
] | 2015-09-25 | [
[
"Lisi",
"A. Garrett",
""
]
] | Our universe is a deforming Lie group. |
2207.08235 | David Benisty | David Benisty | Testing modified gravity via Yukawa potential in two body problem:
Analytical solution and observational constraints | Accepted for Phys Rev D | Phys Rev D 106, 043001 (2022) | 10.1103/PhysRevD.106.043001 | null | gr-qc astro-ph.EP hep-th | http://creativecommons.org/licenses/by/4.0/ | Many alternative theories of gravity screens a Yukawa-type potential. This
article shows Keplerian-type parametrization as a solution of Yukawa type
potential accurate equations of motion for two non-spinning compact objects
moving in an eccentric orbit. A bound from the solar system is presented.
| [
{
"created": "Sun, 17 Jul 2022 17:23:27 GMT",
"version": "v1"
}
] | 2022-08-02 | [
[
"Benisty",
"David",
""
]
] | Many alternative theories of gravity screens a Yukawa-type potential. This article shows Keplerian-type parametrization as a solution of Yukawa type potential accurate equations of motion for two non-spinning compact objects moving in an eccentric orbit. A bound from the solar system is presented. |
gr-qc/9702048 | Pablo Laguna | W. Krivan, P. Laguna, P. Papadopoulos (Penn State) and N. Andersson
(Wash U) | Dynamics of perturbations of rotating black holes | 15 pages, 3 Postscript figures, LaTex | Phys.Rev. D56 (1997) 3395-3404 | 10.1103/PhysRevD.56.3395 | null | gr-qc | null | We present a numerical study of the time evolution of perturbations of
rotating black holes. The solutions are obtained by integrating the Teukolsky
equation written as a first-order in time, coupled system of equations, in a
form that explicitly captures its hyperbolic structure. We address the
numerical difficultie... | [
{
"created": "Mon, 24 Feb 1997 21:41:17 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Krivan",
"W.",
"",
"Penn State"
],
[
"Laguna",
"P.",
"",
"Penn State"
],
[
"Papadopoulos",
"P.",
"",
"Penn State"
],
[
"Andersson",
"N.",
"",
"Wash U"
]
] | We present a numerical study of the time evolution of perturbations of rotating black holes. The solutions are obtained by integrating the Teukolsky equation written as a first-order in time, coupled system of equations, in a form that explicitly captures its hyperbolic structure. We address the numerical difficulties ... |
1204.1773 | Gergely Sz\'ekely | P\'eter N\'emeti and Gergely Sz\'ekely | Existence of Faster Than Light Signals Implies Hypercomputation Already
in Special Relativity | 14 pages, 2 figures | Lecture Notes in Computer Science Volume 7318, 2012, pp 528-538 | 10.1007/978-3-642-30870-3_53 | null | gr-qc math.LO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within an axiomatic framework, we investigate the possibility of
hypercomputation in special relativity via faster than light signals. We
formally show that hypercomputation is theoretically possible in special
relativity if and only if there are faster than light signals.
| [
{
"created": "Mon, 9 Apr 2012 00:21:25 GMT",
"version": "v1"
}
] | 2012-11-27 | [
[
"Németi",
"Péter",
""
],
[
"Székely",
"Gergely",
""
]
] | Within an axiomatic framework, we investigate the possibility of hypercomputation in special relativity via faster than light signals. We formally show that hypercomputation is theoretically possible in special relativity if and only if there are faster than light signals. |
1406.0438 | Artur Alho | Artur Alho and Claes Uggla | Global dynamics and inflationary center manifold and slow-roll
approximants | 32 pages, 24 figures. Appendices incorporated into main text. Matches
final published version | null | 10.1063/1.4906081 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the familiar problem of a minimally coupled scalar field with
quadratic potential in flat Friedmann-Lema\^itre-Robertson-Walker cosmology to
illustrate a number of techniques and tools, which can be applied to a wide
range of scalar field potentials and problems in e.g. modified gravity. We
present a glob... | [
{
"created": "Mon, 2 Jun 2014 16:36:09 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Sep 2014 18:09:04 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Jan 2015 00:08:17 GMT",
"version": "v3"
}
] | 2015-06-19 | [
[
"Alho",
"Artur",
""
],
[
"Uggla",
"Claes",
""
]
] | We consider the familiar problem of a minimally coupled scalar field with quadratic potential in flat Friedmann-Lema\^itre-Robertson-Walker cosmology to illustrate a number of techniques and tools, which can be applied to a wide range of scalar field potentials and problems in e.g. modified gravity. We present a global... |
1308.0229 | Victor Shchigolev Konstantinovich | V.K. Shchigolev | Cosmological Sigma Model with Non-Minimal Coupling to the Target Space | 12 pages, no figures | Cent. Eur. J. Phys., 12(1), 2014, 32-41 | 10.2478/s11534-014-0504-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A homogeneous and isotropic Universe in the framework of nonlinear sigma
model with non-minimal coupling to the target space is considered. A
two-component model of such a sort is preliminary investigated. Some solutions
for this model are given. Perspectives and directions of development of such a
sort of models are... | [
{
"created": "Thu, 1 Aug 2013 14:44:41 GMT",
"version": "v1"
}
] | 2018-02-14 | [
[
"Shchigolev",
"V. K.",
""
]
] | A homogeneous and isotropic Universe in the framework of nonlinear sigma model with non-minimal coupling to the target space is considered. A two-component model of such a sort is preliminary investigated. Some solutions for this model are given. Perspectives and directions of development of such a sort of models are d... |
2303.16566 | Felix Finster | Felix Finster, Eduardo Guendelman, Claudio F. Paganini | Modified Measures as an Effective Theory for Causal Fermion Systems | 25 pages, LaTeX, 3 figures (published version) | Class. Quantum Grav. 41 (2024) 035007 | 10.1088/1361-6382/ad1711 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the structures of the theory of causal fermion systems (CFS), an
approach to unify quantum theory with general relativity (GR), with those of
modified measure theories (MMT), which are a set of modified gravity theories.
Classical spacetimes with MMT can be obtained as the continuum limit of a CFS.
This su... | [
{
"created": "Wed, 29 Mar 2023 09:49:52 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 11:24:53 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Dec 2023 18:10:07 GMT",
"version": "v3"
}
] | 2024-01-19 | [
[
"Finster",
"Felix",
""
],
[
"Guendelman",
"Eduardo",
""
],
[
"Paganini",
"Claudio F.",
""
]
] | We compare the structures of the theory of causal fermion systems (CFS), an approach to unify quantum theory with general relativity (GR), with those of modified measure theories (MMT), which are a set of modified gravity theories. Classical spacetimes with MMT can be obtained as the continuum limit of a CFS. This sugg... |
1503.01956 | Wen-Biao Liu | Jie-Xiong Mo, Wen-Biao Liu | Non-extended phase space thermodynamics of Lovelock AdS black holes in
grand canonical ensemble | null | Eur. Phys. J. C75 (2015) 5, 211 | 10.1140/epjc/s10052-015-3434-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, extended phase space thermodynamics of Lovelock AdS black holes has
been of great interest. To provide insight from a different perspective and
gain a unified phase transition picture, non-extended phase space
thermodynamics of $(n+1)$-dimensional charged topological Lovelock AdS black
holes is investigated... | [
{
"created": "Fri, 6 Mar 2015 13:57:42 GMT",
"version": "v1"
}
] | 2015-05-25 | [
[
"Mo",
"Jie-Xiong",
""
],
[
"Liu",
"Wen-Biao",
""
]
] | Recently, extended phase space thermodynamics of Lovelock AdS black holes has been of great interest. To provide insight from a different perspective and gain a unified phase transition picture, non-extended phase space thermodynamics of $(n+1)$-dimensional charged topological Lovelock AdS black holes is investigated d... |
1312.2250 | Mirjam Cvetic | M. Cvetic, G.W. Gibbons | Exact quasi-normal modes for the near horizon Kerr metric | 4 pages | Phys. Rev. D 89, 064057 (2014) | 10.1103/PhysRevD.89.064057 | UPR-1257-T | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quasi-normal modes of a massless scalar field in a general
sub-extreme Kerr back- ground by exploiting the hidden SL(2, R) x SL(2, R) x
SO(3) symmetry of the subtracted geometry approximation. This faithfully models
the near horizon geometry but locates the black hole in a confining
asymptotically conica... | [
{
"created": "Sun, 8 Dec 2013 19:45:14 GMT",
"version": "v1"
}
] | 2014-04-02 | [
[
"Cvetic",
"M.",
""
],
[
"Gibbons",
"G. W.",
""
]
] | We study the quasi-normal modes of a massless scalar field in a general sub-extreme Kerr back- ground by exploiting the hidden SL(2, R) x SL(2, R) x SO(3) symmetry of the subtracted geometry approximation. This faithfully models the near horizon geometry but locates the black hole in a confining asymptotically conical ... |
1906.06691 | David Benisty | David Benisty, Eduardo Guendelman, Emil Nissimov, Svetlana Pacheva | Dynamically Generated Inflation from Non-Riemannian Volume Forms | 9 pages, to appear in European Physical Journal C | Eur. Phys. J. C (2019) 79: 806 | 10.1140/epjc/s10052-019-7310-6 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simple modified gravity model without any initial matter fields
in terms of several alternative non-Riemannian spacetime volume elements within
the metric (second order) formalism. We show how the non-Riemannian
volume-elements, when passing to the physical Einstein frame, create a
canonical scalar field... | [
{
"created": "Sun, 16 Jun 2019 14:02:01 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Sep 2019 18:46:40 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Benisty",
"David",
""
],
[
"Guendelman",
"Eduardo",
""
],
[
"Nissimov",
"Emil",
""
],
[
"Pacheva",
"Svetlana",
""
]
] | We propose a simple modified gravity model without any initial matter fields in terms of several alternative non-Riemannian spacetime volume elements within the metric (second order) formalism. We show how the non-Riemannian volume-elements, when passing to the physical Einstein frame, create a canonical scalar field a... |
1902.04988 | Reginald Christian Bernardo | Reginald Christian Bernardo and Ian Vega | Hair-dressing Horndeski: an approach to hairy solutions in cubic
Horndeski gravity | 15 pages, 12 figures | Phys. Rev. D 99, 124049 (2019) | 10.1103/PhysRevD.99.124049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In obtaining exact solutions in gravitational theories containing arbitrary
model functions, such as Horndeski gravity, one usually starts by prescribing
the model functions of the theory and then goes on to solving their
corresponding field equations. In this paper, we explore the extent to which
the reverse procedu... | [
{
"created": "Wed, 13 Feb 2019 16:26:49 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2019 00:59:07 GMT",
"version": "v2"
}
] | 2019-07-02 | [
[
"Bernardo",
"Reginald Christian",
""
],
[
"Vega",
"Ian",
""
]
] | In obtaining exact solutions in gravitational theories containing arbitrary model functions, such as Horndeski gravity, one usually starts by prescribing the model functions of the theory and then goes on to solving their corresponding field equations. In this paper, we explore the extent to which the reverse procedure... |
gr-qc/9805026 | Thomas Baumgarte | M. Shibata, T. W. Baumgarte, and S. L. Shapiro | Stability of coalescing binary stars against gravitational collapse:
hydrodynamical simulations | 13 pages, 10 figures, RevTex, to appear in Phys. Rev. D | Phys.Rev.D58:023002,1998 | 10.1103/PhysRevD.58.023002 | null | gr-qc astro-ph | null | We perform simulations of relativistic binary stars in post-Newtonian gravity
to investigate their dynamical stability prior to merger against gravitational
collapse in a tidal field. In general, our equations are only strictly accurate
to first post-Newtonian order, but they recover full general relativity for
spher... | [
{
"created": "Fri, 8 May 1998 14:43:21 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Shibata",
"M.",
""
],
[
"Baumgarte",
"T. W.",
""
],
[
"Shapiro",
"S. L.",
""
]
] | We perform simulations of relativistic binary stars in post-Newtonian gravity to investigate their dynamical stability prior to merger against gravitational collapse in a tidal field. In general, our equations are only strictly accurate to first post-Newtonian order, but they recover full general relativity for spheric... |
2011.04313 | Vladimir S. Manko | V. S. Manko, E. Ruiz | Equatorially symmetric configurations of two Kerr-Newman black holes | 20 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we employ the general equatorially symmetric two-soliton
solution of the Einstein-Maxwell equations for elaborating two physically
meaningful configurations describing a pair of equal Kerr-Newman corotating
black holes separated by a massless strut. The first configuration is
characterized by opposite ... | [
{
"created": "Mon, 9 Nov 2020 10:38:30 GMT",
"version": "v1"
}
] | 2020-11-10 | [
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
]
] | In this paper, we employ the general equatorially symmetric two-soliton solution of the Einstein-Maxwell equations for elaborating two physically meaningful configurations describing a pair of equal Kerr-Newman corotating black holes separated by a massless strut. The first configuration is characterized by opposite ma... |
0907.0934 | Carlo Cafaro | S. A. Ali, C. Cafaro, S. Capozziello, Ch. Corda | On the Poincare Gauge Theory of Gravitation | v2: minor changes, references added; 18 pages, no figures | Int.J.Theor.Phys.48:3426-3448,2009 | 10.1007/s10773-009-0149-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a compact, self-contained review of the conventional gauge
theoretical approach to gravitation based on the local Poincare group of
symmetry transformations. The covariant field equations, Bianchi identities and
conservation laws for angular momentum and energy-momentum are obtained.
| [
{
"created": "Mon, 6 Jul 2009 08:33:46 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 2009 08:52:57 GMT",
"version": "v2"
}
] | 2010-03-25 | [
[
"Ali",
"S. A.",
""
],
[
"Cafaro",
"C.",
""
],
[
"Capozziello",
"S.",
""
],
[
"Corda",
"Ch.",
""
]
] | We present a compact, self-contained review of the conventional gauge theoretical approach to gravitation based on the local Poincare group of symmetry transformations. The covariant field equations, Bianchi identities and conservation laws for angular momentum and energy-momentum are obtained. |
1705.11008 | Rajibul Shaikh | Rajibul Shaikh, Sayan Kar | Gravitational lensing by scalar-tensor wormholes and the energy
conditions | 29 pages, 11 figures, revised version with a new section, published
in PRD | Phys. Rev. D 96, 044037 (2017) | 10.1103/PhysRevD.96.044037 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational lensing by a class of zero Ricci scalar wormholes
which arise as solutions in a scalar-tensor theory of gravity. An attempt is
made to find a possible link between lensing features, stable/unstable photon
orbits and the energy conditions on the matter required to support these
spacetimes. Our a... | [
{
"created": "Wed, 31 May 2017 10:00:15 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Aug 2017 15:19:48 GMT",
"version": "v2"
}
] | 2017-08-29 | [
[
"Shaikh",
"Rajibul",
""
],
[
"Kar",
"Sayan",
""
]
] | We study gravitational lensing by a class of zero Ricci scalar wormholes which arise as solutions in a scalar-tensor theory of gravity. An attempt is made to find a possible link between lensing features, stable/unstable photon orbits and the energy conditions on the matter required to support these spacetimes. Our ana... |
1107.2458 | Jonathan McDonald | Paul M. Alsing, Jonathan R. McDonald, Warner A. Miller | The Simplicial Ricci Tensor | 19 pages, 2 figures | Class.Quant.Grav.28:155007,2011 | 10.1088/0264-9381/28/15/155007 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Ricci tensor (Ric) is fundamental to Einstein's geometric theory of
gravitation. The 3-dimensional Ric of a spacelike surface vanishes at the
moment of time symmetry for vacuum spacetimes. The 4-dimensional Ric is the
Einstein tensor for such spacetimes. More recently the Ric was used by Hamilton
to define a non-... | [
{
"created": "Wed, 13 Jul 2011 03:42:51 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"Alsing",
"Paul M.",
""
],
[
"McDonald",
"Jonathan R.",
""
],
[
"Miller",
"Warner A.",
""
]
] | The Ricci tensor (Ric) is fundamental to Einstein's geometric theory of gravitation. The 3-dimensional Ric of a spacelike surface vanishes at the moment of time symmetry for vacuum spacetimes. The 4-dimensional Ric is the Einstein tensor for such spacetimes. More recently the Ric was used by Hamilton to define a non-li... |
gr-qc/0408007 | Victor Tapia | Victor Tapia | Differential Invariants for Higher-Rank Tensors. A Progress Report | null | null | null | null | gr-qc | null | We outline the construction of differential invariants for higher--rank
tensors.
| [
{
"created": "Tue, 3 Aug 2004 08:06:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tapia",
"Victor",
""
]
] | We outline the construction of differential invariants for higher--rank tensors. |
2104.14258 | Laur J\"arv | Laur J\"arv and Joosep Lember | Global portraits of nonminimal teleparallel inflation | 22 pages, 14 plots; v2: minor typos corrected, references added,
version accepted by "Universe" | Universe 2021, 7(6), 179 | 10.3390/universe7060179 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the global phase portraits of inflationary dynamics in
teleparallel gravity models with a scalar field nonminimally coupled to torsion
scalar. The adopted set of variables can clearly distinguish between different
asymptotic states as fixed points, including the kinetic and inflationary
regimes. The key ... | [
{
"created": "Thu, 29 Apr 2021 11:04:48 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2022 14:15:02 GMT",
"version": "v2"
}
] | 2022-03-03 | [
[
"Järv",
"Laur",
""
],
[
"Lember",
"Joosep",
""
]
] | We construct the global phase portraits of inflationary dynamics in teleparallel gravity models with a scalar field nonminimally coupled to torsion scalar. The adopted set of variables can clearly distinguish between different asymptotic states as fixed points, including the kinetic and inflationary regimes. The key ro... |
0810.1328 | Andreas Ross | James B. Gilmore, Andreas Ross | Effective field theory calculation of second post-Newtonian binary
dynamics | Replaced with published version | Phys.Rev.D78:124021,2008 | 10.1103/PhysRevD.78.124021 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the effective field theory for gravitational bound states, proposed by
Goldberger and Rothstein, to compute the interaction Lagrangian of a binary
system at the second Post-Newtonian order. Throughout the calculation, we use a
metric parametrization based on a temporal Kaluza-Klein decomposition and test
the c... | [
{
"created": "Wed, 8 Oct 2008 19:35:20 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Feb 2009 23:57:04 GMT",
"version": "v2"
}
] | 2009-02-11 | [
[
"Gilmore",
"James B.",
""
],
[
"Ross",
"Andreas",
""
]
] | We use the effective field theory for gravitational bound states, proposed by Goldberger and Rothstein, to compute the interaction Lagrangian of a binary system at the second Post-Newtonian order. Throughout the calculation, we use a metric parametrization based on a temporal Kaluza-Klein decomposition and test the cla... |
1511.03933 | Laur J\~Arv | Laur Jarv, Alexey Toporensky | General relativity as an attractor for scalar-torsion cosmology | 8 pages, typos corrected | Phys. Rev. D 93, 024051 (2016) | 10.1103/PhysRevD.93.024051 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study flat Friedmann-Lemaitre-Robertson-Walker cosmological models for a
scalar field coupled nonminimally to teleparallel gravity with generic coupling
and potential functions. The goal of this paper is to determine the conditions
under which the cosmological evolution tends to the limit where the variation
of th... | [
{
"created": "Thu, 12 Nov 2015 15:48:08 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jan 2016 18:31:07 GMT",
"version": "v2"
}
] | 2016-08-08 | [
[
"Jarv",
"Laur",
""
],
[
"Toporensky",
"Alexey",
""
]
] | We study flat Friedmann-Lemaitre-Robertson-Walker cosmological models for a scalar field coupled nonminimally to teleparallel gravity with generic coupling and potential functions. The goal of this paper is to determine the conditions under which the cosmological evolution tends to the limit where the variation of the ... |
1201.2882 | John Barrow | John D. Barrow | Some Inflationary Einstein-Aether Cosmologies | 10 pages, no figures | Phys. Rev. D 85, 047503 (2012) | 10.1103/PhysRevD.85.047503 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how to derive several families of accelerating universe solutions to
an Einstein-Aether gravity theory. These solutions provide possible
descriptions of inflationary behaviour in the early universe and late-time
cosmological acceleration.
| [
{
"created": "Fri, 13 Jan 2012 16:13:51 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Barrow",
"John D.",
""
]
] | We show how to derive several families of accelerating universe solutions to an Einstein-Aether gravity theory. These solutions provide possible descriptions of inflationary behaviour in the early universe and late-time cosmological acceleration. |
0804.1899 | Branislav Cvetkovi\'c | M. Blagojevi\'c and B. Cvetkovi\'c | Electric field in 3D gravity with torsion | LATEX, 15 pages, v2: minor corrections | Phys.Rev.D78:044036,2008 | 10.1103/PhysRevD.78.044036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that in static and spherically symmetric configurations of the
system of Maxwell field coupled to 3D gravity with torsion, at least one of the
Maxwell field components has to vanish. Restricting our attention to the
electric sector of the theory, we find an interesting exact solution,
corresponding to the... | [
{
"created": "Fri, 11 Apr 2008 13:51:08 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Sep 2008 11:04:40 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Blagojević",
"M.",
""
],
[
"Cvetković",
"B.",
""
]
] | It is shown that in static and spherically symmetric configurations of the system of Maxwell field coupled to 3D gravity with torsion, at least one of the Maxwell field components has to vanish. Restricting our attention to the electric sector of the theory, we find an interesting exact solution, corresponding to the a... |
gr-qc/9708035 | Bernd Bruegmann | Bernd Bruegmann | Binary Black Hole Mergers in 3d Numerical Relativity | 8 pages, 9 figures, REVTeX; expanded discussion, results unchanged | Int.J.Mod.Phys.D8:85,1999 | 10.1142/S0218271899000080 | null | gr-qc astro-ph | null | The standard approach to the numerical evolution of black hole data using the
ADM formulation with maximal slicing and vanishing shift is extended to
non-symmetric black hole data containing black holes with linear momentum and
spin by using a time-independent conformal rescaling based on the puncture
representation ... | [
{
"created": "Mon, 18 Aug 1997 19:47:22 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 1997 15:07:57 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Mar 1999 08:27:40 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Bruegmann",
"Bernd",
""
]
] | The standard approach to the numerical evolution of black hole data using the ADM formulation with maximal slicing and vanishing shift is extended to non-symmetric black hole data containing black holes with linear momentum and spin by using a time-independent conformal rescaling based on the puncture representation of... |
1601.03940 | Massimo Tessarotto | Massimo Tessarotto (Department of Mathematics and Geosciences,
University of Trieste, Italy and Institute of Physics, Faculty of Philosophy
and Science, Silesian University in Opava, Bezru\v{c}ovo n\'am.13, CZ-74601
Opava, Czech Republic) and Claudio Cremaschini (Institute of Physics, Faculty
of Philosophy and ... | Theory of non-local point transformations - Part 1: Representation of
Teleparallel Gravity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper the extension of the functional setting customarily adopted in
General Relativity (GR) is considered. For this purpose, an explicit solution
of the so-called Einstein's\ Teleparallel problem is sought. This is achieved
by a suitable extension of the traditional concept of GR reference frame and is
based... | [
{
"created": "Wed, 13 Jan 2016 07:54:01 GMT",
"version": "v1"
}
] | 2016-01-18 | [
[
"Tessarotto",
"Massimo",
"",
"Department of Mathematics and Geosciences,\n University of Trieste, Italy and Institute of Physics, Faculty of Philosophy\n and Science, Silesian University in Opava, Bezručovo nám.13, CZ-74601\n Opava, Czech Republic"
],
[
"Cremaschini",
"Claudio",
... | In this paper the extension of the functional setting customarily adopted in General Relativity (GR) is considered. For this purpose, an explicit solution of the so-called Einstein's\ Teleparallel problem is sought. This is achieved by a suitable extension of the traditional concept of GR reference frame and is based o... |
1706.05470 | David Figueiredo | David Figueiredo, Fernando Moraes, S\'ebastien Fumeron and Bertrand
Berche | Cosmology in the laboratory: an analogy between hyperbolic metamaterials
and the Milne universe | 12 pages, 9 figures | Phys. Rev. D 96, 105012 (2017) | 10.1103/PhysRevD.96.105012 | null | gr-qc cond-mat.soft | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article shows that the compactified Milne universe geometry, a toy model
for the big crunch/big bang transition, can be realized in hyperbolic
metamaterials, a new class of nanoengineered systems which have recently found
its way as an experimental playground for cosmological ideas. On one side,
Klein-Gordon par... | [
{
"created": "Sat, 17 Jun 2017 02:28:46 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Nov 2017 18:05:59 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Figueiredo",
"David",
""
],
[
"Moraes",
"Fernando",
""
],
[
"Fumeron",
"Sébastien",
""
],
[
"Berche",
"Bertrand",
""
]
] | This article shows that the compactified Milne universe geometry, a toy model for the big crunch/big bang transition, can be realized in hyperbolic metamaterials, a new class of nanoengineered systems which have recently found its way as an experimental playground for cosmological ideas. On one side, Klein-Gordon parti... |
2104.08851 | Jacques Smulevici | Grigorios Fournodavlos, Jacques Smulevici | The initial boundary value problem in General Relativity: the umbilic
case | null | null | null | null | gr-qc math.AP math.DG | http://creativecommons.org/licenses/by/4.0/ | We give a short proof of local well-posedness for the initial boundary value
problem in general relativity with sole boundary condition the requirement that
the boundary is umbilic. This includes as a special case the totally geodesic
boundary condition that we had previously addressed in [8]. The proof is based
on w... | [
{
"created": "Sun, 18 Apr 2021 13:25:57 GMT",
"version": "v1"
}
] | 2021-04-20 | [
[
"Fournodavlos",
"Grigorios",
""
],
[
"Smulevici",
"Jacques",
""
]
] | We give a short proof of local well-posedness for the initial boundary value problem in general relativity with sole boundary condition the requirement that the boundary is umbilic. This includes as a special case the totally geodesic boundary condition that we had previously addressed in [8]. The proof is based on wav... |
1010.0227 | J. Brian Pitts | J. Brian Pitts | Massive Nordstr\"om Scalar (Density) Gravities from Universal Coupling | Forthcoming in General Relativity and Gravitation | Gen.Rel.Grav.43:871-895,2011 | 10.1007/s10714-010-1100-7 | null | gr-qc hep-th physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Both particle physics and the 1890s Seeliger-Neumann modification of
Newtonian gravity suggest considering a "mass term" for gravity, yielding a
finite range due to an exponentially decaying Yukawa potential. Unlike
Nordstr\"{o}m's "massless" theory, massive scalar gravities are strictly
Special Relativistic, being i... | [
{
"created": "Fri, 1 Oct 2010 18:08:01 GMT",
"version": "v1"
}
] | 2011-02-23 | [
[
"Pitts",
"J. Brian",
""
]
] | Both particle physics and the 1890s Seeliger-Neumann modification of Newtonian gravity suggest considering a "mass term" for gravity, yielding a finite range due to an exponentially decaying Yukawa potential. Unlike Nordstr\"{o}m's "massless" theory, massive scalar gravities are strictly Special Relativistic, being inv... |
2107.07370 | Rajes Ghosh | Rajes Ghosh and Sudipta Sarkar | Light rings of stationary spacetimes | 5 pages, no figure | Phys. Rev. D 104, 044019 (2021) | 10.1103/PhysRevD.104.044019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel theorem regarding light rings in a stationary spacetime
with an ergoregion. We prove that any stationary, axisymmetric, and
asymptotically flat spacetime in 1 + 3 dimensions with an ergoregion must have
at least one light ring outside the ergoregion. A possible extension of the
proof for asymptotic... | [
{
"created": "Thu, 15 Jul 2021 14:50:06 GMT",
"version": "v1"
}
] | 2021-08-11 | [
[
"Ghosh",
"Rajes",
""
],
[
"Sarkar",
"Sudipta",
""
]
] | We present a novel theorem regarding light rings in a stationary spacetime with an ergoregion. We prove that any stationary, axisymmetric, and asymptotically flat spacetime in 1 + 3 dimensions with an ergoregion must have at least one light ring outside the ergoregion. A possible extension of the proof for asymptotical... |
1209.4085 | Roman Gold | Roman Gold, Bernd Bruegmann | Eccentric black hole mergers and zoom-whirl behavior from elliptic
inspirals to hyperbolic encounters | 19 pages, 23 figures | null | 10.1103/PhysRevD.88.064051 | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a parameter study of non-spinning, equal and unequal mass black
hole binaries on generic, eccentric orbits in numerical relativity. The linear
momentum considered ranges from that of a circular orbit to ten times that
value. We discuss the different manifestations of zoom-whirl behavior in the
hyperbolic a... | [
{
"created": "Tue, 18 Sep 2012 20:00:07 GMT",
"version": "v1"
}
] | 2013-10-02 | [
[
"Gold",
"Roman",
""
],
[
"Bruegmann",
"Bernd",
""
]
] | We perform a parameter study of non-spinning, equal and unequal mass black hole binaries on generic, eccentric orbits in numerical relativity. The linear momentum considered ranges from that of a circular orbit to ten times that value. We discuss the different manifestations of zoom-whirl behavior in the hyperbolic and... |
2306.03999 | Himanshu Chaudhary | Himanshu Chaudhary, Amine Bouali, Niyaz Uddin Molla, Ujjal Debnath,
G.Mustafa | Cosmological Tests of $f(R,G,\mathcal{T})$ Dark Energy Model in FRW
Universe | 19 pages, 10 figures; accepted for publication in EPJC | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This research article presents a new cosmological model formulated within the
$f(R,G,\mathcal{T})$ framework, focusing on the observational signatures and
parameter constraints of the model. The Markov Chain Monte Carlo (MCMC)
technique is employed to effectively explore the parameter space using data
from 36 Cosmic ... | [
{
"created": "Tue, 6 Jun 2023 20:21:19 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 2023 08:26:49 GMT",
"version": "v2"
}
] | 2023-09-29 | [
[
"Chaudhary",
"Himanshu",
""
],
[
"Bouali",
"Amine",
""
],
[
"Molla",
"Niyaz Uddin",
""
],
[
"Debnath",
"Ujjal",
""
],
[
"Mustafa",
"G.",
""
]
] | This research article presents a new cosmological model formulated within the $f(R,G,\mathcal{T})$ framework, focusing on the observational signatures and parameter constraints of the model. The Markov Chain Monte Carlo (MCMC) technique is employed to effectively explore the parameter space using data from 36 Cosmic Ch... |
gr-qc/9304035 | Henri Waelbrock | Michael P. Ryan and Sergio Hojman | Non-standard phase space variables, quantization, and path integrals, or
little ado about much | ICN-UNAM-93-07, 12 pages | null | null | null | gr-qc | null | Contribution to the Misner Festshrift, no abstract.
| [
{
"created": "Thu, 22 Apr 1993 19:39:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ryan",
"Michael P.",
""
],
[
"Hojman",
"Sergio",
""
]
] | Contribution to the Misner Festshrift, no abstract. |
1510.03701 | Clare Burrage | Philippe Brax, Clare Burrage, Anne-Christine Davis | The Speed of Galileon Gravity | 17 pages, 3 figures | JCAP 1603 (2016) no.03, 004 | 10.1088/1475-7516/2016/03/004 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the speed of gravitational waves in coupled Galileon models with
an equation of state $\omega_\phi=-1$ now and a ghost-free Minkowski limit. We
find that the gravitational waves propagate much faster than the speed of light
unless these models are small perturbations of cubic Galileons and the Galileon
ene... | [
{
"created": "Fri, 9 Oct 2015 17:14:52 GMT",
"version": "v1"
}
] | 2016-06-21 | [
[
"Brax",
"Philippe",
""
],
[
"Burrage",
"Clare",
""
],
[
"Davis",
"Anne-Christine",
""
]
] | We analyse the speed of gravitational waves in coupled Galileon models with an equation of state $\omega_\phi=-1$ now and a ghost-free Minkowski limit. We find that the gravitational waves propagate much faster than the speed of light unless these models are small perturbations of cubic Galileons and the Galileon energ... |
1310.7849 | George E. A. Matsas | George E. A. Matsas, Raissa F. P. Mendes, and Daniel A. T. Vanzella | Reply to "Comment on `Quantum versus classical instability of scalar
fields in curved backgrounds'" | 2 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the reasoning which led the author of arXiv:1310.6252 to reach
his conclusions relies on an incorrect criterion for the existence of
normalizable bound solutions. We reinforce that the general result derived in
the Appendix of our paper (arXiv:1310.2185), namely, that "there are no
tachyonic (i.e., unsta... | [
{
"created": "Tue, 29 Oct 2013 15:44:46 GMT",
"version": "v1"
}
] | 2013-10-30 | [
[
"Matsas",
"George E. A.",
""
],
[
"Mendes",
"Raissa F. P.",
""
],
[
"Vanzella",
"Daniel A. T.",
""
]
] | We show that the reasoning which led the author of arXiv:1310.6252 to reach his conclusions relies on an incorrect criterion for the existence of normalizable bound solutions. We reinforce that the general result derived in the Appendix of our paper (arXiv:1310.2185), namely, that "there are no tachyonic (i.e., unstabl... |
1510.04957 | Ra\'ul Carballo-Rubio | Carlos Barcel\'o, Ra\'ul Carballo-Rubio and Luis J. Garay | Where does the physics of extreme gravitational collapse reside? | 43 pages, 1 figure. Review article with new results on the black to
white hole transition. Prepared for the special issue "Open Questions in
Black Hole Physics" edited by Gonzalo J. Olmo | Universe 2 (2016) no.2, 7 | 10.3390/universe2020007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational collapse of massive stars serves to manifest the most
severe deviations of general relativity with respect to Newtonian gravity: the
formation of horizons and spacetime singularities. Both features have proven to
be catalysts of deep physical developments, especially when combined with the
principle... | [
{
"created": "Fri, 16 Oct 2015 17:24:14 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Barceló",
"Carlos",
""
],
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Garay",
"Luis J.",
""
]
] | The gravitational collapse of massive stars serves to manifest the most severe deviations of general relativity with respect to Newtonian gravity: the formation of horizons and spacetime singularities. Both features have proven to be catalysts of deep physical developments, especially when combined with the principles ... |
2112.01308 | Subhajit Barman | Subhajit Barman, Dipankar Barman, Bibhas Ranjan Majhi | Entanglement harvesting from conformal vacuums between two Unruh-DeWitt
detectors moving along null paths | Comments added, published in JHEP | null | 10.1007/JHEP09(2022)106 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that the $(1+1)$ dimensional Schwarzschild and spatially
flat FLRW spacetimes are conformally flat. This work examines entanglement
harvesting from the conformal field vacuums in these spacetimes between two
Unruh-DeWitt detectors, moving along outgoing null trajectories. In $(1+1)$
dimensional Schwa... | [
{
"created": "Thu, 2 Dec 2021 15:05:18 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2022 16:50:53 GMT",
"version": "v2"
}
] | 2022-09-28 | [
[
"Barman",
"Subhajit",
""
],
[
"Barman",
"Dipankar",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | It is well-known that the $(1+1)$ dimensional Schwarzschild and spatially flat FLRW spacetimes are conformally flat. This work examines entanglement harvesting from the conformal field vacuums in these spacetimes between two Unruh-DeWitt detectors, moving along outgoing null trajectories. In $(1+1)$ dimensional Schwarz... |
2307.16626 | Yasuyuki Hatsuda | Yasuyuki Hatsuda, Masashi Kimura | Perturbative quasinormal mode frequencies | 48 pages | null | null | RUP-23-13 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We often encounter a situation that black hole solutions can be regarded as
continuous deformations of simpler ones, or modify general relativity by
continuous parameters. We develop a general framework to compute high-order
perturbative corrections to quasinormal mode frequencies in such deformed
problems. Our metho... | [
{
"created": "Mon, 31 Jul 2023 13:04:04 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Feb 2024 02:05:31 GMT",
"version": "v2"
}
] | 2024-02-06 | [
[
"Hatsuda",
"Yasuyuki",
""
],
[
"Kimura",
"Masashi",
""
]
] | We often encounter a situation that black hole solutions can be regarded as continuous deformations of simpler ones, or modify general relativity by continuous parameters. We develop a general framework to compute high-order perturbative corrections to quasinormal mode frequencies in such deformed problems. Our method ... |
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