id stringlengths 9 13 | submitter stringlengths 1 64 ⌀ | authors stringlengths 5 22.9k | title stringlengths 4 245 | comments stringlengths 1 548 ⌀ | journal-ref stringlengths 4 362 ⌀ | doi stringlengths 12 82 ⌀ | report-no stringlengths 2 281 ⌀ | categories stringclasses 793
values | license stringclasses 9
values | orig_abstract stringlengths 24 1.95k | versions listlengths 1 30 | update_date stringlengths 10 10 | authors_parsed listlengths 1 1.74k | abstract stringlengths 21 1.95k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1208.0635 | Takeshi Chiba | Akifumi Yumoto, Daisuke Nitta, Takeshi Chiba, Naoshi Sugiyama | Shadows of Multi-Black Holes: Analytic Exploration | 15 pages, 11 figures, to appear in Phys. Rev. D | null | 10.1103/PhysRevD.86.103001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Shadows of multi-black holes have structures distinct from the mere
superposition of the shadow of a single black hole: the eyebrow-like structures
outside the main shadows and the deformation of the shadows. We present
analytic estimates of these structures using the static multi-black hole
solution (Majumdar-Papape... | [
{
"created": "Fri, 3 Aug 2012 00:33:25 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2012 07:10:06 GMT",
"version": "v2"
}
] | 2015-03-20 | [
[
"Yumoto",
"Akifumi",
""
],
[
"Nitta",
"Daisuke",
""
],
[
"Chiba",
"Takeshi",
""
],
[
"Sugiyama",
"Naoshi",
""
]
] | Shadows of multi-black holes have structures distinct from the mere superposition of the shadow of a single black hole: the eyebrow-like structures outside the main shadows and the deformation of the shadows. We present analytic estimates of these structures using the static multi-black hole solution (Majumdar-Papapetr... |
0909.1093 | Christian R\"over | Christian R\"over, Marie-Anne Bizouard, Nelson Christensen, Harald
Dimmelmeier, Ik Siong Heng, Renate Meyer | Bayesian reconstruction of gravitational wave burst signals from
simulations of rotating stellar core collapse and bounce | 17 pages, 9 figures | Physical Review D, 80(10):102004, 2009 | 10.1103/PhysRevD.80.102004 | AEI-2009-089 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Presented in this paper is a technique that we propose for extracting the
physical parameters of a rotating stellar core collapse from the observation of
the associated gravitational wave signal from the collapse and core bounce.
Data from interferometric gravitational wave detectors can be used to provide
informatio... | [
{
"created": "Sun, 6 Sep 2009 16:26:49 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2009 14:55:10 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Nov 2009 08:15:39 GMT",
"version": "v3"
}
] | 2009-11-18 | [
[
"Röver",
"Christian",
""
],
[
"Bizouard",
"Marie-Anne",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Dimmelmeier",
"Harald",
""
],
[
"Heng",
"Ik Siong",
""
],
[
"Meyer",
"Renate",
""
]
] | Presented in this paper is a technique that we propose for extracting the physical parameters of a rotating stellar core collapse from the observation of the associated gravitational wave signal from the collapse and core bounce. Data from interferometric gravitational wave detectors can be used to provide information ... |
0803.0602 | George Pappas | G. Pappas, T. A. Apostolatos | Faithful transformation of quasi-isotropic to Weyl-Papapetrou
coordinates: A prerequisite to compare metrics | 18 pages, 2 figures | Class.Quant.Grav.25:228002,2008 | 10.1088/0264-9381/25/22/228002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate how one should transform correctly quasi-isotropic coordinates
to Weyl-Papapetrou coordinates in order to compare the metric around a rotating
star that has been constructed numerically in the former coordinates with an
axially symmetric stationary metric that is given through an analytical form in
the... | [
{
"created": "Wed, 5 Mar 2008 10:36:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pappas",
"G.",
""
],
[
"Apostolatos",
"T. A.",
""
]
] | We demonstrate how one should transform correctly quasi-isotropic coordinates to Weyl-Papapetrou coordinates in order to compare the metric around a rotating star that has been constructed numerically in the former coordinates with an axially symmetric stationary metric that is given through an analytical form in the l... |
0911.0599 | Mark D. Roberts | Mark D. Roberts | Constructing Spacetime from the String Worldsheet | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a certain sense riemannian geometry can be thought of as geometry built up
from the finslerian properties of point particles. The generalization of this
to where the geometry is built up from the finslerian properties of string and
membranes is investigated. Solely classical arguments suggest a physical
interpreta... | [
{
"created": "Tue, 3 Nov 2009 15:51:56 GMT",
"version": "v1"
}
] | 2009-11-04 | [
[
"Roberts",
"Mark D.",
""
]
] | In a certain sense riemannian geometry can be thought of as geometry built up from the finslerian properties of point particles. The generalization of this to where the geometry is built up from the finslerian properties of string and membranes is investigated. Solely classical arguments suggest a physical interpretati... |
0911.1816 | Quentin G. Bailey | Quentin G. Bailey | Lorentz Violation and Gravity | 5 pages, presented at the IAU Symposium No. 261: Relativity in
Fundamental Astronomy, Virginia Beach, VA, May 2009 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the last decade, a variety of high-precision experiments have searched for
miniscule violations of Lorentz symmetry. These searches are largely motivated
by the possibility of uncovering experimental signatures from a fundamental
unified theory. Experimental results are reported in the framework called the
Standar... | [
{
"created": "Tue, 10 Nov 2009 01:51:48 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Bailey",
"Quentin G.",
""
]
] | In the last decade, a variety of high-precision experiments have searched for miniscule violations of Lorentz symmetry. These searches are largely motivated by the possibility of uncovering experimental signatures from a fundamental unified theory. Experimental results are reported in the framework called the Standard-... |
1912.04470 | Jessica Santiago | Jessica Santiago | On the Connections between Thermodynamics and General Relativity | PhD thesis (Victoria University of Wellington) - 192 pages, 16
figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis, the connections between thermodynamics and general relativity
are explored. We review the concept of gravitationally induced temperature
gradients in equilibrium states, first introduced by Richard Tolman. We explore
these Tolman-like temperature gradients, understanding their physical origin
and whet... | [
{
"created": "Tue, 10 Dec 2019 03:20:36 GMT",
"version": "v1"
}
] | 2019-12-11 | [
[
"Santiago",
"Jessica",
""
]
] | In this thesis, the connections between thermodynamics and general relativity are explored. We review the concept of gravitationally induced temperature gradients in equilibrium states, first introduced by Richard Tolman. We explore these Tolman-like temperature gradients, understanding their physical origin and whethe... |
1012.1706 | Sujitkumar Chatterjee | S. Chatterjee | Inhomogeneities in dusty universe - a possible alternative to dark
energy? | 14 pages, 4 figures | JCAP 1103:014,2011 | 10.1088/1475-7516/2011/03/014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There have been of late renewed debates on the role of inhomogeneities to
explain the observed late acceleration of the universe. We have looked into the
problem analytically with the help of the well known spherically symmetric but
inhomogeneous Lemaitre-Tolman-Bondi(LTB) model generalised to higher
dimensions. It i... | [
{
"created": "Wed, 8 Dec 2010 08:48:09 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jan 2011 08:19:13 GMT",
"version": "v2"
}
] | 2011-03-18 | [
[
"Chatterjee",
"S.",
""
]
] | There have been of late renewed debates on the role of inhomogeneities to explain the observed late acceleration of the universe. We have looked into the problem analytically with the help of the well known spherically symmetric but inhomogeneous Lemaitre-Tolman-Bondi(LTB) model generalised to higher dimensions. It is ... |
2404.04447 | Douglas Gingrich Mr. | Douglas M. Gingrich | Quasinormal modes of a nonsingular spherically symmetric black hole
effective model with holonomy corrections | 30 pages, 8 figures, 10 tables | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We calculate the quasinormal modes of a nonsingular spherically symmetric
black hole effective model with holonomy corrections. The model is based on
quantum corrections inspired by loop quantum gravity. It is covariant and
results in a spacetime that is regular everywhere with a parameter-dependent
black bounce.
P... | [
{
"created": "Fri, 5 Apr 2024 23:30:44 GMT",
"version": "v1"
}
] | 2024-04-11 | [
[
"Gingrich",
"Douglas M.",
""
]
] | We calculate the quasinormal modes of a nonsingular spherically symmetric black hole effective model with holonomy corrections. The model is based on quantum corrections inspired by loop quantum gravity. It is covariant and results in a spacetime that is regular everywhere with a parameter-dependent black bounce. Pertu... |
gr-qc/9405032 | Hermann Nicolai | D. Korotkin and H. Nicolai (Hamburg University) | The Ernst Equation on a Riemann Surface | 22 pages | Nucl.Phys. B429 (1994) 229-254 | 10.1016/S0550-3213(94)80048-0 | DESY 94-038 | gr-qc | null | The Ernst equation is formulated on an arbitrary Riemann surface.
Analytically, the problem reduces to finding solutions of the ordinary Ernst
equation which are periodic along the symmetry axis. The family of (punctured)
Riemann surfaces admitting a non-trivial Ernst field constitutes a ``partially
discretized'' sub... | [
{
"created": "Fri, 13 May 1994 10:56:09 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Korotkin",
"D.",
"",
"Hamburg University"
],
[
"Nicolai",
"H.",
"",
"Hamburg University"
]
] | The Ernst equation is formulated on an arbitrary Riemann surface. Analytically, the problem reduces to finding solutions of the ordinary Ernst equation which are periodic along the symmetry axis. The family of (punctured) Riemann surfaces admitting a non-trivial Ernst field constitutes a ``partially discretized'' subsp... |
gr-qc/0105118 | Tomas Dolezel | Nathalie Deruelle and Tomas Dolezel | On linearized gravity in the Randall-Sundrum scenario | 12 pages, plain TeX, no figures | Phys.Rev. D64 (2001) 103506 | 10.1103/PhysRevD.64.103506 | null | gr-qc astro-ph hep-th | null | In the literature about the Randall-Sundrum scenario one finds on one hand
that there exist (small) corrections to Newton's law of gravity on the brane,
and on another that the exact (and henceforth linearized) Einstein equations
can be recovered on the brane. The explanation for these seemingly
contradictory results... | [
{
"created": "Wed, 30 May 2001 19:51:32 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Deruelle",
"Nathalie",
""
],
[
"Dolezel",
"Tomas",
""
]
] | In the literature about the Randall-Sundrum scenario one finds on one hand that there exist (small) corrections to Newton's law of gravity on the brane, and on another that the exact (and henceforth linearized) Einstein equations can be recovered on the brane. The explanation for these seemingly contradictory results i... |
2401.13283 | Ioannis Raptis | Ioannis Raptis | Functoriality in Finitary Vacuum Einstein Gravity and Free Yang-Mills
Theories from an Abstract Differential Geometric Perspective | This is an invited paper contribution to a Special Volume titled
`Physical Geometry: Unravelling the Weave of Quantum Geometry' in memory and
honour of Professor Anastasios Mallios, edited by Dr Elias Zafiris. Extended
latest version includes two Addenda and an Appendix at the back | null | null | null | gr-qc math-ph math.CT math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue ongoing research work on applying the homological algebraic
conceptual and technical machinery of Abstract Differential Geometry towards
formulating a finitary, causal and quantal version of vacuum Einstein
Lorentzian gravity and free Yang-Mills theories.
| [
{
"created": "Wed, 24 Jan 2024 07:54:10 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jan 2024 07:53:58 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Feb 2024 11:45:06 GMT",
"version": "v3"
}
] | 2024-05-07 | [
[
"Raptis",
"Ioannis",
""
]
] | We continue ongoing research work on applying the homological algebraic conceptual and technical machinery of Abstract Differential Geometry towards formulating a finitary, causal and quantal version of vacuum Einstein Lorentzian gravity and free Yang-Mills theories. |
1106.3744 | Jakub Mielczarek | Jakub Mielczarek, Thomas Cailleteau, Aurelien Barrau and Julien Grain | Anomaly-free vector perturbations with holonomy corrections in loop
quantum cosmology | 16 pages, 1 figure. Matches version published in Class. Quantum Grav | Class. Quantum Grav. 29 (2012) 085009 | 10.1088/0264-9381/29/8/085009 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate vector perturbations with holonomy corrections in the
framework of loop quantum cosmology. Conditions to achieve anomaly freedom for
these perturbations are found at all orders. This requires the introduction of
counter-terms in the hamiltonian constraint. We also show that anomaly freedom
requires the... | [
{
"created": "Sun, 19 Jun 2011 13:24:05 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2012 13:46:47 GMT",
"version": "v2"
}
] | 2012-04-04 | [
[
"Mielczarek",
"Jakub",
""
],
[
"Cailleteau",
"Thomas",
""
],
[
"Barrau",
"Aurelien",
""
],
[
"Grain",
"Julien",
""
]
] | We investigate vector perturbations with holonomy corrections in the framework of loop quantum cosmology. Conditions to achieve anomaly freedom for these perturbations are found at all orders. This requires the introduction of counter-terms in the hamiltonian constraint. We also show that anomaly freedom requires the d... |
1212.1265 | Dah-Wei Chiou | Dah-Wei Chiou, Wei-Tou Ni, and Alf Tang | Loop quantization of spherically symmetric midisuperspaces and loop
quantum geometry of the maximally extended Schwarzschild spacetime | 46 pages, 3 figures, 2 tables; revised with one more reference added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We elaborate on the Ashtekar's formalism for spherically symmetric
midisuperspaces and, for loop quantization, propound a new quantization scheme
which yields a graph-preserving Hamiltonian constraint operator and by which
one can impose the fundamental discreteness of loop quantum gravity a la the
strategy of "impro... | [
{
"created": "Thu, 6 Dec 2012 09:21:20 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jan 2013 12:17:54 GMT",
"version": "v2"
}
] | 2013-01-28 | [
[
"Chiou",
"Dah-Wei",
""
],
[
"Ni",
"Wei-Tou",
""
],
[
"Tang",
"Alf",
""
]
] | We elaborate on the Ashtekar's formalism for spherically symmetric midisuperspaces and, for loop quantization, propound a new quantization scheme which yields a graph-preserving Hamiltonian constraint operator and by which one can impose the fundamental discreteness of loop quantum gravity a la the strategy of "improve... |
1908.03212 | William Wolf | William J. Wolf, Macarena Lagos | Cosmological Instabilities and the Role of Matter Interactions in
Dynamical Dark Energy Models | 11 pages. Updated to match published version | Phys. Rev. D 100, 084035 (2019) | 10.1103/PhysRevD.100.084035 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider cosmological models with a dynamical dark energy field, and study
the presence of three types of commonly found instabilities, namely ghost (when
fields have negative kinetic energy), gradient (negative momentum squared) and
tachyon (negative mass squared). In particular, we study the linear scalar
pertur... | [
{
"created": "Thu, 8 Aug 2019 17:49:29 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2019 15:48:39 GMT",
"version": "v2"
}
] | 2019-10-30 | [
[
"Wolf",
"William J.",
""
],
[
"Lagos",
"Macarena",
""
]
] | We consider cosmological models with a dynamical dark energy field, and study the presence of three types of commonly found instabilities, namely ghost (when fields have negative kinetic energy), gradient (negative momentum squared) and tachyon (negative mass squared). In particular, we study the linear scalar perturba... |
gr-qc/0307114 | Saulo Carneiro | Saulo Carneiro | Decaying Lambda cosmology with varying G | Work presented at the Tenth Marcel Grossmann Meeting on General
Relativity, Rio de Janeiro, July 20-26, 2003 | null | 10.1142/9789812704030_0204 | null | gr-qc astro-ph | null | We study a uniform and isotropic cosmology with a decaying vacuum energy
density, in the realm of a model with a time varying gravitational "constant".
We show that, for late times, such a cosmology is in accordance with the
observed values of the cosmological parameters. In particular, we can obtain
the observed rat... | [
{
"created": "Tue, 29 Jul 2003 19:52:13 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Carneiro",
"Saulo",
""
]
] | We study a uniform and isotropic cosmology with a decaying vacuum energy density, in the realm of a model with a time varying gravitational "constant". We show that, for late times, such a cosmology is in accordance with the observed values of the cosmological parameters. In particular, we can obtain the observed ratio... |
1602.01043 | Morteza Mohseni | Morteza Mohseni and Mohsen Fathi | Focusing of world-lines in Weyl gravity | 3 eps figures | Eur. Phys. J. Plus (2016) 131: 21 | 10.1140/epjp/i2016-16021-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of time-like congruences in the vacuum solutions of
Weyl conformal theory of gravity. Using the Raycaudhuri equation, we show that
for positive values of the coeffcient of the linear term in the solution and in
the absence of the cosmological constant, the incoming rays converge. The
evolution ... | [
{
"created": "Tue, 2 Feb 2016 18:54:49 GMT",
"version": "v1"
}
] | 2016-02-03 | [
[
"Mohseni",
"Morteza",
""
],
[
"Fathi",
"Mohsen",
""
]
] | We study the evolution of time-like congruences in the vacuum solutions of Weyl conformal theory of gravity. Using the Raycaudhuri equation, we show that for positive values of the coeffcient of the linear term in the solution and in the absence of the cosmological constant, the incoming rays converge. The evolution of... |
gr-qc/0309061 | Tetsuya Shiromizu | Tetsuya Shiromizu, Daisuke Ida, Shinya Tomizawa | Kinematical bound in asymptotically translationally invariant spacetimes | 5 pages, typos corrected | Phys.Rev. D69 (2004) 027503 | 10.1103/PhysRevD.69.027503 | null | gr-qc astro-ph hep-ph hep-th | null | We present positive energy theorems in asymptotically translationally
invariant spacetimes which can be applicable to black strings and charged
branes. We also address the bound property of the tension and charge of branes.
| [
{
"created": "Fri, 12 Sep 2003 13:19:30 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Sep 2003 14:36:26 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Shiromizu",
"Tetsuya",
""
],
[
"Ida",
"Daisuke",
""
],
[
"Tomizawa",
"Shinya",
""
]
] | We present positive energy theorems in asymptotically translationally invariant spacetimes which can be applicable to black strings and charged branes. We also address the bound property of the tension and charge of branes. |
2402.00432 | Kamma K Venkataratnam | Dhwani Gangal, Sudhava Yadav and K.K.Venkataratnam | Density fluctuations for Squeezed Number State and Coherent Squeezed
Number State in Flat FRW Universe | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the density fluctuations for Coherent Squeezed Number State (CSNS)
and Squeezed Number States (SNS) formalism in Semiclassical theory of grav ity
in flat FRW universe. We used Number state evolution of oscillatory phase of
inflaton for coherent squeezed number state and squeezed number states for
malisms. We... | [
{
"created": "Thu, 1 Feb 2024 08:58:28 GMT",
"version": "v1"
}
] | 2024-02-02 | [
[
"Gangal",
"Dhwani",
""
],
[
"Yadav",
"Sudhava",
""
],
[
"Venkataratnam",
"K. K.",
""
]
] | We study the density fluctuations for Coherent Squeezed Number State (CSNS) and Squeezed Number States (SNS) formalism in Semiclassical theory of grav ity in flat FRW universe. We used Number state evolution of oscillatory phase of inflaton for coherent squeezed number state and squeezed number states for malisms. We a... |
0901.4696 | Lucia Santamaria | Lucia Santamaria, Badri Krishnan, John T. Whelan | Searching for numerically-simulated signals of black hole binaries with
a phenomenological template family | 13 pages, 4 figures, to appear in the proceedings of the NRDA08
meeting, Syracuse, Aug. 11-14, 2008 | Class.Quant.Grav.26:114010,2009 | 10.1088/0264-9381/26/11/114010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent progress in numerical relativity now allows computation of the binary
black hole merger, whereas post-Newtonian and perturbative techniques can be
used to model the inspiral and ringdown phases. So far, most gravitational-wave
searches have made use of various post-Newtonian-inspired templates to search
for si... | [
{
"created": "Thu, 29 Jan 2009 14:57:06 GMT",
"version": "v1"
}
] | 2009-06-10 | [
[
"Santamaria",
"Lucia",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Whelan",
"John T.",
""
]
] | Recent progress in numerical relativity now allows computation of the binary black hole merger, whereas post-Newtonian and perturbative techniques can be used to model the inspiral and ringdown phases. So far, most gravitational-wave searches have made use of various post-Newtonian-inspired templates to search for sign... |
1108.2255 | Keith Copsey | Keith Copsey | Gravitation and tunnelling: Subtleties of the thin-wall approximation
and rapid decays | 70 pages, 6 figures, introduction written as self-contained summary | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I provide some simple physical arguments that, once gravitation and some
subtleties are taken into account, rather broad classes of potentials result in
instantons which tunnel relatively rapidly between perturbatively stable
minima. In particular, due to some previously unappreciated technical
subtleties, the decay ... | [
{
"created": "Wed, 10 Aug 2011 19:22:42 GMT",
"version": "v1"
}
] | 2015-03-19 | [
[
"Copsey",
"Keith",
""
]
] | I provide some simple physical arguments that, once gravitation and some subtleties are taken into account, rather broad classes of potentials result in instantons which tunnel relatively rapidly between perturbatively stable minima. In particular, due to some previously unappreciated technical subtleties, the decay ra... |
0909.4221 | Abhay Ashtekar | Abhay Ashtekar, Miguel Campiglia and Adam Henderson | Loop Quantum Cosmology and Spin Foams | 11 pages, no figures | Phys.Lett.B681:347-352,2009 | 10.1016/j.physletb.2009.10.042 | IGC-09/9-1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop quantum cosmology (LQC) is used to provide concrete evidence in support
of the general paradigm underlying spin foam models (SFMs). Specifically, it is
shown that: i) the physical inner product in the timeless framework equals the
transition amplitude in the deparameterized theory; ii) this quantity admits a
%co... | [
{
"created": "Wed, 23 Sep 2009 14:45:23 GMT",
"version": "v1"
}
] | 2009-12-10 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Campiglia",
"Miguel",
""
],
[
"Henderson",
"Adam",
""
]
] | Loop quantum cosmology (LQC) is used to provide concrete evidence in support of the general paradigm underlying spin foam models (SFMs). Specifically, it is shown that: i) the physical inner product in the timeless framework equals the transition amplitude in the deparameterized theory; ii) this quantity admits a %conv... |
1504.03472 | Dmitry Shogin | Dmitry Shogin and Per Amund Amundsen | Local equilibrium solutions in simple anisotropic cosmological models,
as described by relativistic fluid dynamics | 18 pages, 1 figure | Class. Quant. Grav. 33 (2016), 205009 | 10.1088/0264-9381/33/20/205009 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We test the physical relevance of the full and the truncated versions of the
Israel-Stewart theory of irreversible thermodynamics in a cosmological setting.
Using a dynamical systems method, we determine the asymptotic future of plane
symmetric Bianchi type I spacetimes with a viscous mathematical fluid, keeping
trac... | [
{
"created": "Tue, 14 Apr 2015 09:42:29 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Nov 2015 13:55:47 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Jul 2016 14:48:50 GMT",
"version": "v3"
}
] | 2016-09-30 | [
[
"Shogin",
"Dmitry",
""
],
[
"Amundsen",
"Per Amund",
""
]
] | We test the physical relevance of the full and the truncated versions of the Israel-Stewart theory of irreversible thermodynamics in a cosmological setting. Using a dynamical systems method, we determine the asymptotic future of plane symmetric Bianchi type I spacetimes with a viscous mathematical fluid, keeping track ... |
gr-qc/0301125 | Jiro Soda | Jiro Soda, Sugumi Kanno | Non-linear Gravity on Branes and Effective Action | 5 pages, talk presented at The 12th Workshop on General Relativity
and Gravitation, Tokyo, Japan, November, 2002 | null | null | KUCP0224 | gr-qc | null | We develop the general formalism to study the low energy regime of the brane
world. We apply our formalism to the single brane model where the AdS/CFT
correspondence will take an important role. We also consider the two-brane
system and show the system is described by the quasi-scalar tensor gravity. Our
result provi... | [
{
"created": "Fri, 31 Jan 2003 07:36:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Soda",
"Jiro",
""
],
[
"Kanno",
"Sugumi",
""
]
] | We develop the general formalism to study the low energy regime of the brane world. We apply our formalism to the single brane model where the AdS/CFT correspondence will take an important role. We also consider the two-brane system and show the system is described by the quasi-scalar tensor gravity. Our result provide... |
1408.0690 | Cosimo Bambi | Cosimo Bambi | Note on the Cardoso-Pani-Rico parametrization to test the Kerr black
hole hypothesis | 5 pages, 3 figures. v2: a few typos corrected | Phys. Rev. D 90, 047503 (2014) | 10.1103/PhysRevD.90.047503 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The construction of a generic parametrization to describe the spacetime
geometry around astrophysical black hole candidates is an important step to
test the Kerr black hole hypothesis. In the last few years, the
Johannsen-Psaltis metric has been the most common framework to study possible
deviations from the Kerr sol... | [
{
"created": "Mon, 4 Aug 2014 14:09:37 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2014 08:05:34 GMT",
"version": "v2"
}
] | 2014-08-20 | [
[
"Bambi",
"Cosimo",
""
]
] | The construction of a generic parametrization to describe the spacetime geometry around astrophysical black hole candidates is an important step to test the Kerr black hole hypothesis. In the last few years, the Johannsen-Psaltis metric has been the most common framework to study possible deviations from the Kerr solut... |
1704.03055 | David McNutt | A. A. Coley, D. D. McNutt | Horizon Detection and Higher Dimensional Black Rings | 19 pages | Classical and Quantum Gravity, 34, 035008, 2017 | 10.1088/1361-6382/34/3/035008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the stationary horizons of the rotating black ring and
the supersymmetric black ring spacetimes in five dimensions. In the case of the
rotating black ring we use Weyl aligned null directions to algebraically
classify the Weyl tensor, and utilize an adapted Cartan algorithm in order to
produce C... | [
{
"created": "Mon, 10 Apr 2017 20:50:45 GMT",
"version": "v1"
}
] | 2017-04-12 | [
[
"Coley",
"A. A.",
""
],
[
"McNutt",
"D. D.",
""
]
] | In this paper we study the stationary horizons of the rotating black ring and the supersymmetric black ring spacetimes in five dimensions. In the case of the rotating black ring we use Weyl aligned null directions to algebraically classify the Weyl tensor, and utilize an adapted Cartan algorithm in order to produce Car... |
2306.13324 | Avik De Dr. | Hamid Shabani, Avik De, Tee-How Loo, Emmanuel N. Saridakis | Cosmology of $f(Q)$ gravity in non-flat Universe | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the cosmological implications of $f(Q)$ gravity, which is a
modified theory of gravity based on non-metricity, in non-flat geometry. We
perform a detailed dynamical-system analysis keeping the $f(Q)$ function
completely arbitrary. As we show, the cosmological scenario admits a
dark-matter dominated poi... | [
{
"created": "Fri, 23 Jun 2023 07:03:25 GMT",
"version": "v1"
}
] | 2023-06-26 | [
[
"Shabani",
"Hamid",
""
],
[
"De",
"Avik",
""
],
[
"Loo",
"Tee-How",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the cosmological implications of $f(Q)$ gravity, which is a modified theory of gravity based on non-metricity, in non-flat geometry. We perform a detailed dynamical-system analysis keeping the $f(Q)$ function completely arbitrary. As we show, the cosmological scenario admits a dark-matter dominated point... |
2003.12109 | Christian Friedrich Steinwachs | Enrique Hernand\'ez-Lorenzo, Christian F. Steinwachs | Naked singularities in quadratic f(R) gravity | 7 pages, 2 figures; Appendix with explicit form of EOMs added; to
appear in PRD | Phys. Rev. D 101, 124046 (2020) | 10.1103/PhysRevD.101.124046 | FR-PHENO-2020-004 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find new static, spherically symmetric, and asymptotically flat vacuum
solutions without horizon in Starobinsky's quadratic f(R) gravity. We
systematically classify these solutions by an asymptotic analysis around the
origin and find seven different integer Frobenius families. We numerically
solve the exact equati... | [
{
"created": "Thu, 26 Mar 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jun 2020 11:48:48 GMT",
"version": "v2"
}
] | 2020-07-01 | [
[
"Hernandéz-Lorenzo",
"Enrique",
""
],
[
"Steinwachs",
"Christian F.",
""
]
] | We find new static, spherically symmetric, and asymptotically flat vacuum solutions without horizon in Starobinsky's quadratic f(R) gravity. We systematically classify these solutions by an asymptotic analysis around the origin and find seven different integer Frobenius families. We numerically solve the exact equation... |
1807.08701 | B.B. Pilgrim | M. Aghili, L. Bombelli, BB Pilgrim | Discrete Spacetime: a Web of Chains | 26 pages, 16 figures | null | 10.1088/1361-6382/ab30e3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies the distribution of chain and maximal chain lengths in a
causal set. We first provide a new derivation for these distributions for a
causal set uniformly embedded in Minkowski space, for various dimensionalities,
which includes a correction to previously available expressions. Results of
numerical ... | [
{
"created": "Mon, 23 Jul 2018 16:24:52 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2019 21:45:21 GMT",
"version": "v2"
}
] | 2019-07-15 | [
[
"Aghili",
"M.",
""
],
[
"Bombelli",
"L.",
""
],
[
"Pilgrim",
"BB",
""
]
] | This paper studies the distribution of chain and maximal chain lengths in a causal set. We first provide a new derivation for these distributions for a causal set uniformly embedded in Minkowski space, for various dimensionalities, which includes a correction to previously available expressions. Results of numerical si... |
1906.01153 | Juan Calderon Bustillo | Juan Calder\'on Bustillo, Chris Evans, James A. Clark, Grace Kim,
Pablo Laguna and Deirdre Shoemaker | Post-merger chirps from binary black holes as probes of the final
black-hole horizon | Version accepted in Communications Physics. 11 pages, 5 figures in
main text, 3 Figures in Supp. Material | Communications Physics volume 3, Article number: 176 (2020) | 10.1038/s42005-020-00446-7 | LIGO DCC: P-1900139 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The merger of a binary black hole gives birth to a highly distorted final
black hole. The gravitational radiation emitted as this black hole relaxes
presents us with the unique opportunity to probe extreme gravity and its
connection with the dynamics of the black hole horizon. Using numerical
relativity simulations, ... | [
{
"created": "Tue, 4 Jun 2019 01:53:42 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 2020 09:36:57 GMT",
"version": "v2"
}
] | 2020-11-18 | [
[
"Bustillo",
"Juan Calderón",
""
],
[
"Evans",
"Chris",
""
],
[
"Clark",
"James A.",
""
],
[
"Kim",
"Grace",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Shoemaker",
"Deirdre",
""
]
] | The merger of a binary black hole gives birth to a highly distorted final black hole. The gravitational radiation emitted as this black hole relaxes presents us with the unique opportunity to probe extreme gravity and its connection with the dynamics of the black hole horizon. Using numerical relativity simulations, we... |
1203.4995 | Pierre Martinetti | Pierre Martinetti | Emergence of time in quantum gravity: is time necessarily flowing ? | Contribution to the Workshop "Temps et Emergence", Ecole Normale
Sup\'erieure, Paris 14-15 october 2011. To be published in Kronoscope.
Intended for a non-specialist audience | null | null | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the emergence of time in quantum gravity, and ask whether time is
always "something that flows"'. We first recall that this is indeed the case in
both relativity and quantum mechanics, although in very different manners: time
flows geometrically in relativity (i.e. as a flow of proper time in the four
dime... | [
{
"created": "Thu, 22 Mar 2012 14:01:57 GMT",
"version": "v1"
}
] | 2012-04-10 | [
[
"Martinetti",
"Pierre",
""
]
] | We discuss the emergence of time in quantum gravity, and ask whether time is always "something that flows"'. We first recall that this is indeed the case in both relativity and quantum mechanics, although in very different manners: time flows geometrically in relativity (i.e. as a flow of proper time in the four dimens... |
0902.2982 | Christian Boehmer | Christian G. Boehmer, Francisco S. N. Lobo | Stability of the Einstein static universe in modified Gauss-Bonnet
gravity | 5 pages, 1 figure; minor text changes, added references, improved
figure; shortened version to comply with length restrictions | Phys.Rev.D79:067504,2009 | 10.1103/PhysRevD.79.067504 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the stability of the Einstein static universe by considering
homogeneous perturbations in the context of f(G) modified Gauss-Bonnet theories
of gravity. By considering a generic form of f(G), the stability region of the
Einstein static universe is parameterized by the linear equation of state
parameter w=p... | [
{
"created": "Tue, 17 Feb 2009 19:35:29 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2009 11:52:32 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Mar 2009 15:18:02 GMT",
"version": "v3"
}
] | 2009-03-30 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | We analyze the stability of the Einstein static universe by considering homogeneous perturbations in the context of f(G) modified Gauss-Bonnet theories of gravity. By considering a generic form of f(G), the stability region of the Einstein static universe is parameterized by the linear equation of state parameter w=p/r... |
1603.00849 | Vyacheslav Dokuchaev | V. A. Berezin, V. I. Dokuchaev and Yu. N. Eroshenko | On maximal analytical extension of the Vaidya metric | 15 pages, 9 updated figures | Class. Quantum Grav. 33, 145003 (2016) | 10.1088/0264-9381/33/14/145003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical Vaidya metric is transformed to the special diagonal
coordinates in the case of the linear mass function allowing rather easy
treatment. We find the exact analytical expressions for metric functions in
these diagonal coordinates. Using these coordinates, we elaborate the maximum
analytic extension of th... | [
{
"created": "Wed, 2 Mar 2016 20:15:08 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2016 12:00:46 GMT",
"version": "v2"
}
] | 2016-06-21 | [
[
"Berezin",
"V. A.",
""
],
[
"Dokuchaev",
"V. I.",
""
],
[
"Eroshenko",
"Yu. N.",
""
]
] | The classical Vaidya metric is transformed to the special diagonal coordinates in the case of the linear mass function allowing rather easy treatment. We find the exact analytical expressions for metric functions in these diagonal coordinates. Using these coordinates, we elaborate the maximum analytic extension of the ... |
gr-qc/0612076 | Yosef Zlochower | Manuela Campanelli, Carlos O. Lousto, Yosef Zlochower, Badri Krishnan,
David Merritt | Spin Flips and Precession in Black-Hole-Binary Mergers | Revtex4, 17 figures, 14 pages. Accepted for publication in PRD | Phys.Rev.D75:064030,2007 | 10.1103/PhysRevD.75.064030 | null | gr-qc astro-ph | null | We use the `moving puncture' approach to perform fully non-linear evolutions
of spinning quasi-circular black-hole binaries with individual spins not
aligned with the orbital angular momentum. We evolve configurations with the
individual spins (parallel and equal in magnitude) pointing in the orbital
plane and 45-deg... | [
{
"created": "Wed, 13 Dec 2006 15:06:43 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2006 19:16:52 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jan 2007 14:58:07 GMT",
"version": "v3"
},
{
"created": "Tue, 13 Mar 2007 19:51:12 GMT",
"version": "v4"
}
] | 2009-09-29 | [
[
"Campanelli",
"Manuela",
""
],
[
"Lousto",
"Carlos O.",
""
],
[
"Zlochower",
"Yosef",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Merritt",
"David",
""
]
] | We use the `moving puncture' approach to perform fully non-linear evolutions of spinning quasi-circular black-hole binaries with individual spins not aligned with the orbital angular momentum. We evolve configurations with the individual spins (parallel and equal in magnitude) pointing in the orbital plane and 45-degre... |
gr-qc/0207119 | S. K. Sahay | D.C. Srivastava and S.K. Sahay | Data analysis of continuous gravitational wave: Fourier transform-II | Accepted in MNRAS, 14 pages, 4 figures | Mon.Not.Roy.Astron.Soc. 337 (2002) 315-321 | 10.1046/j.1365-8711.2002.05915.x | null | gr-qc astro-ph | null | In this paper we obtain the Fourier Transform of a continuous gravitational
wave. We have analysed the data set for (i) one year observation time and (ii)
arbitrary observation time, for arbitrary location of detector and source
taking into account the effects arising due to rotational as well as orbital
motion of th... | [
{
"created": "Tue, 30 Jul 2002 17:56:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Srivastava",
"D. C.",
""
],
[
"Sahay",
"S. K.",
""
]
] | In this paper we obtain the Fourier Transform of a continuous gravitational wave. We have analysed the data set for (i) one year observation time and (ii) arbitrary observation time, for arbitrary location of detector and source taking into account the effects arising due to rotational as well as orbital motion of the ... |
0708.3203 | Ivan Stefanov | Ivan Zh. Stefanov, Stoytcho S. Yazadjiev, Michail D. Todorov | Scalar-tensor black holes coupled to Euler-Heisenberg nonlinear
electrodynamics | 16 pages, 7 figures, Mod. Phys. Lett. A22, (2007) 1217-1231 | null | 10.1142/S0217732307023560 | null | gr-qc | null | The no-scalar-hair conjecture rules out the existence of asymptotically flat
black holes with a scalar dressing for a large class of theories.
No-scalar-hair theorems have been proved for the cases of neutral black holes
and for charged black holes in the Maxwell electrodynamics. These theorems,
however, do not apply... | [
{
"created": "Thu, 23 Aug 2007 16:39:30 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Stefanov",
"Ivan Zh.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Todorov",
"Michail D.",
""
]
] | The no-scalar-hair conjecture rules out the existence of asymptotically flat black holes with a scalar dressing for a large class of theories. No-scalar-hair theorems have been proved for the cases of neutral black holes and for charged black holes in the Maxwell electrodynamics. These theorems, however, do not apply i... |
2312.16913 | Mahmoud AlHallak | Mahmoud AlHallak | $F(R,w)$ Gravity: A new gravity framework | 9 pages, 4 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this work we present a new framework of the gravity sector by considering
the extension $F(R,w)$, in which $R$ is the Ricci scalar and $w$ is the
equation of state. Three different choices of function $F(R,w)$ are
investigated under the Palatini formalism. The models appear equivalent to
$F(R)$ models of gravity w... | [
{
"created": "Thu, 28 Dec 2023 09:15:54 GMT",
"version": "v1"
}
] | 2023-12-29 | [
[
"AlHallak",
"Mahmoud",
""
]
] | In this work we present a new framework of the gravity sector by considering the extension $F(R,w)$, in which $R$ is the Ricci scalar and $w$ is the equation of state. Three different choices of function $F(R,w)$ are investigated under the Palatini formalism. The models appear equivalent to $F(R)$ models of gravity wit... |
1407.2030 | Hirotaka Yoshino | Hirotaka Yoshino, Hideo Kodama | Probing the string axiverse by gravitational waves from Cygnus X-1 | 8 pages, 3 figures, to be published in PTEP Letters | Prog. Theor. Exp. Phys. (2015) 061E01 | 10.1093/ptep/ptv067 | KEK-TH-1751, KEK-Cosmo-151 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the axiverse scenario, a massive scalar field (string axion) forms a cloud
around a rotating black hole (BH) by superradiant instability and emits
continuous gravitational waves (GWs). We examine constraints on the string
axion parameters that can be obtained from GW observations. If no signal is
detected in a tar... | [
{
"created": "Tue, 8 Jul 2014 10:33:44 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2014 09:57:07 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Apr 2015 17:15:26 GMT",
"version": "v3"
}
] | 2015-06-02 | [
[
"Yoshino",
"Hirotaka",
""
],
[
"Kodama",
"Hideo",
""
]
] | In the axiverse scenario, a massive scalar field (string axion) forms a cloud around a rotating black hole (BH) by superradiant instability and emits continuous gravitational waves (GWs). We examine constraints on the string axion parameters that can be obtained from GW observations. If no signal is detected in a targe... |
2003.02686 | Luca Amendola | Luca Amendola (Heidelberg University) and Shinji Tsujikawa (Tokyo
University of Science) | Scaling solutions and weak gravity in dark energy with energy and
momentum couplings | 20 pages, three figures; some typos corrected; matches version
accepted for publication on JCAP | null | 10.1088/1475-7516/2020/06/020 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the $\Lambda$CDM tensions of the Hubble-Lemaitre expansion rate
$H_0$ and the clustering normalization $\sigma_8$ can be eased, at least in
principle, by considering an interaction between dark energy and dark matter in
such a way to induce a small and positive early effective equation of state and
a we... | [
{
"created": "Wed, 4 Mar 2020 16:21:27 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jun 2020 21:49:26 GMT",
"version": "v2"
}
] | 2020-06-17 | [
[
"Amendola",
"Luca",
"",
"Heidelberg University"
],
[
"Tsujikawa",
"Shinji",
"",
"Tokyo\n University of Science"
]
] | We argue that the $\Lambda$CDM tensions of the Hubble-Lemaitre expansion rate $H_0$ and the clustering normalization $\sigma_8$ can be eased, at least in principle, by considering an interaction between dark energy and dark matter in such a way to induce a small and positive early effective equation of state and a weak... |
gr-qc/9308029 | Kouji Nakamura | K.Nakamura, S.Konno, Y.Shiro, A.Tomimatsu | Quantum Fluctuations of Black Hole Geometry | 18 pages, DPNU-93-31 | Prog.Theor.Phys. 90 (1993) 861-870 | 10.1143/ptp/90.4.861 | null | gr-qc hep-th | null | By using the minisuperspace model for the interior metric ofstatic black
holes, we solve the Wheeler-DeWitt equation to study quantum mechanics of the
horizon geometry. Our basic idea is to introduce the gravitational mass and the
expansions of null rays as quantum operators. Then, the exact wave function is
found as... | [
{
"created": "Thu, 26 Aug 1993 15:12:08 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Nakamura",
"K.",
""
],
[
"Konno",
"S.",
""
],
[
"Shiro",
"Y.",
""
],
[
"Tomimatsu",
"A.",
""
]
] | By using the minisuperspace model for the interior metric ofstatic black holes, we solve the Wheeler-DeWitt equation to study quantum mechanics of the horizon geometry. Our basic idea is to introduce the gravitational mass and the expansions of null rays as quantum operators. Then, the exact wave function is found as a... |
2109.13515 | Shubhen Biswas | Shubhen Biswas | Transformations of metric tensor and interactive theory of gravity | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper it is reconciled how the metric in Minkowskian space-time gets
transformed from one coordinates system to another after successive Lorentz
transformations. And likewise this idea is generalized to achieve metric
transformation from one curved spacetime to another. The synergy between
different sources o... | [
{
"created": "Tue, 28 Sep 2021 06:32:30 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Oct 2021 04:57:30 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Jan 2022 15:07:10 GMT",
"version": "v3"
},
{
"created": "Thu, 23 Jun 2022 11:51:37 GMT",
"version": "v4"
},
{
"cre... | 2023-05-08 | [
[
"Biswas",
"Shubhen",
""
]
] | In this paper it is reconciled how the metric in Minkowskian space-time gets transformed from one coordinates system to another after successive Lorentz transformations. And likewise this idea is generalized to achieve metric transformation from one curved spacetime to another. The synergy between different sources of ... |
gr-qc/0409080 | Djordje Sijacki | Djordje Sijacki | $\bar{SL}(4,R)$ Embedding for a 3D World Spinor Equation | null | Class.Quant.Grav. 21 (2004) 4575 | 10.1088/0264-9381/21/19/007 | null | gr-qc | null | A generic-curved spacetime Dirac-like equation in 3D is constructed. It has,
owing to the $\bar{SL}(n,R)$ group deunitarizing automorphism, a physically
correct unitarity and flat spacetime particle properties. The construction is
achieved by embedding $\bar{SL}(3,R)$ vector operator $X_{\mu}$, that plays a
role of D... | [
{
"created": "Tue, 21 Sep 2004 13:39:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sijacki",
"Djordje",
""
]
] | A generic-curved spacetime Dirac-like equation in 3D is constructed. It has, owing to the $\bar{SL}(n,R)$ group deunitarizing automorphism, a physically correct unitarity and flat spacetime particle properties. The construction is achieved by embedding $\bar{SL}(3,R)$ vector operator $X_{\mu}$, that plays a role of Dir... |
1707.01258 | Branislav Cvetkovi\'c | Branislav Cvetkovi\'c and Dejan Simi\'c | A black hole with torsion in 5D Lovelock gravity | LATEX, 15 pages; v2, redaction improved, references added | Class. Quantum Grav. 35 (2018) 055005 | 10.1088/1361-6382/aaa3a7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyzed static spherically symmetric solutions of the five dimensional
(5D) Lovelock gravity in the first order formulation. In the Riemannian sector,
when torsion vanishes, Boulware-Deser black hole represents a unique static
spherically symmetric black hole solution for the generic choice of the
Lagrangian para... | [
{
"created": "Wed, 5 Jul 2017 08:26:49 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2018 22:28:18 GMT",
"version": "v2"
}
] | 2018-02-12 | [
[
"Cvetković",
"Branislav",
""
],
[
"Simić",
"Dejan",
""
]
] | We analyzed static spherically symmetric solutions of the five dimensional (5D) Lovelock gravity in the first order formulation. In the Riemannian sector, when torsion vanishes, Boulware-Deser black hole represents a unique static spherically symmetric black hole solution for the generic choice of the Lagrangian parame... |
gr-qc/9805012 | Nikolaos Stergioulas | Nikolaos Stergioulas | Rotating Stars in Relativity | 23 pages, review article for Living Reviews in Relativity,
http://www.livingreviews.org replaced with final version (corrected minor
typing errors, updated several sections and added new references) | Living Rev.Rel.1:8,1998 | 10.12942/lrr-1998-8 | null | gr-qc astro-ph | null | Rotating relativistic stars are receiving significant attention in recent
years, because of the information they can yield about the equation of state of
matter at extremely high densities and because they are one of the more
possible sources of detectable gravitational waves. We review the latest
theoretical and num... | [
{
"created": "Tue, 5 May 1998 20:14:41 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jul 1998 13:42:50 GMT",
"version": "v2"
}
] | 2016-10-19 | [
[
"Stergioulas",
"Nikolaos",
""
]
] | Rotating relativistic stars are receiving significant attention in recent years, because of the information they can yield about the equation of state of matter at extremely high densities and because they are one of the more possible sources of detectable gravitational waves. We review the latest theoretical and numer... |
2407.07956 | Swagat Saurav Mishra | Athul K. Soman, Swagat S. Mishra, Mohammed Shafi, Soumen Basak | Inflationary Gravitational Waves as a probe of the unknown
post-inflationary primordial Universe | 52 pages, 15 figures, Github link provided in the paper, Revised
version, additional references and appendix | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | One of the key predictions of the standard inflationary paradigm is the
quantum mechanical generation of the transverse and traceless tensor
fluctuations due to the rapid accelerated expansion of space, which later
constitute a stochastic background of primordial gravitational waves (GWs). The
amplitude of the (nearl... | [
{
"created": "Wed, 10 Jul 2024 18:00:14 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 2024 13:38:02 GMT",
"version": "v2"
}
] | 2024-07-29 | [
[
"Soman",
"Athul K.",
""
],
[
"Mishra",
"Swagat S.",
""
],
[
"Shafi",
"Mohammed",
""
],
[
"Basak",
"Soumen",
""
]
] | One of the key predictions of the standard inflationary paradigm is the quantum mechanical generation of the transverse and traceless tensor fluctuations due to the rapid accelerated expansion of space, which later constitute a stochastic background of primordial gravitational waves (GWs). The amplitude of the (nearly)... |
1306.0518 | Alex Venditti | Alex Venditti and Charles Dyer | The Casimir effect in a topologically closed Minkowski spacetime | There was a crucial error in solving for the wave modes which leads
to an incorrect conclusion | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results concerning the Casimir effect in a topologically closed Minkowski
spacetime.
| [
{
"created": "Mon, 3 Jun 2013 17:41:18 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2013 14:57:40 GMT",
"version": "v2"
}
] | 2013-06-17 | [
[
"Venditti",
"Alex",
""
],
[
"Dyer",
"Charles",
""
]
] | Results concerning the Casimir effect in a topologically closed Minkowski spacetime. |
1606.03694 | Luca Fabbri | Roberto Cianci, Luca Fabbri, Stefano Vignolo | Critical exact solutions for self-gravitating Dirac fields | 12 pages | Eur.Phys.J.C76:595(2016) | 10.1140/epjc/s10052-016-4428-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Einstein-Dirac field equations describing a self-gravitating
massive neutrino, looking for axially-symmetric exact solutions; in the search
of general solutions, we find some that are specific and which have critical
features, such as the fact that the space-time curvature turns out to be flat
and the... | [
{
"created": "Sun, 12 Jun 2016 11:19:00 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2016 08:56:07 GMT",
"version": "v2"
}
] | 2016-11-08 | [
[
"Cianci",
"Roberto",
""
],
[
"Fabbri",
"Luca",
""
],
[
"Vignolo",
"Stefano",
""
]
] | We consider the Einstein-Dirac field equations describing a self-gravitating massive neutrino, looking for axially-symmetric exact solutions; in the search of general solutions, we find some that are specific and which have critical features, such as the fact that the space-time curvature turns out to be flat and the s... |
gr-qc/0509126 | Daniel M\"uller | Daniel M\"uller | The power spectrum of the circular noise | accepted for publication in GRG | Gen.Rel.Grav. 37 (2005) 1905-1910 | 10.1007/s10714-005-0164-2 | null | gr-qc | null | The circular noise is important in connection to Mach's principle, and also
as a possible probe of the Unruh effect. In this letter the power spectrum of
the detector following the Trocheries-Takeno motion in the Minkowski vacuum is
analytically obtained in the form of an infinite series. A mean distribution
function... | [
{
"created": "Fri, 30 Sep 2005 14:25:49 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Müller",
"Daniel",
""
]
] | The circular noise is important in connection to Mach's principle, and also as a possible probe of the Unruh effect. In this letter the power spectrum of the detector following the Trocheries-Takeno motion in the Minkowski vacuum is analytically obtained in the form of an infinite series. A mean distribution function a... |
gr-qc/0508026 | Chiang-Mei Chen | Chiang-Mei Chen, James M. Nester, and Roh-Suan Tung | The Hamiltonian boundary term and quasi-local energy flux | 12 pages, no figures, revtex4 | Phys.Rev. D72 (2005) 104020 | 10.1103/PhysRevD.72.104020 | null | gr-qc | null | The Hamiltonian for a gravitating region includes a boundary term which
determines not only the quasi-local values but also, via the boundary variation
principle, the boundary conditions. Using our covariant Hamiltonian formalism,
we found four particular quasi-local energy-momentum boundary term expressions;
each co... | [
{
"created": "Mon, 8 Aug 2005 10:13:51 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Chen",
"Chiang-Mei",
""
],
[
"Nester",
"James M.",
""
],
[
"Tung",
"Roh-Suan",
""
]
] | The Hamiltonian for a gravitating region includes a boundary term which determines not only the quasi-local values but also, via the boundary variation principle, the boundary conditions. Using our covariant Hamiltonian formalism, we found four particular quasi-local energy-momentum boundary term expressions; each corr... |
2206.07291 | Michael Good | Michael R.R. Good and Paul C.W. Davies | Infrared acceleration radiation | 4 pages, 5 figures | Found.Phys. 53 (2023) 3, 53 | 10.1007/s10701-023-00694-x | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We present an exactly soluble electron trajectory that permits an analysis of
the soft (deep infrared) radiation emitted, the existence of which has been
experimentally observed during beta decay via lowest order inner
bremsstrahlung. Our treatment also predicts the time evolution and temperature
of the emission, and... | [
{
"created": "Wed, 15 Jun 2022 04:19:26 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Jul 2022 03:51:05 GMT",
"version": "v2"
}
] | 2023-05-15 | [
[
"Good",
"Michael R. R.",
""
],
[
"Davies",
"Paul C. W.",
""
]
] | We present an exactly soluble electron trajectory that permits an analysis of the soft (deep infrared) radiation emitted, the existence of which has been experimentally observed during beta decay via lowest order inner bremsstrahlung. Our treatment also predicts the time evolution and temperature of the emission, and p... |
2101.07476 | Kazuharu Bamba | Riasat Ali, Kazuharu Bamba, Muhammad Asgher, and Syed Asif Ali Shah | Tunneling Under the Influence of Quantum Gravity in Black Rings | 8 pages, 2 figures, version accepted for publication in International
Journal of Modern Physics D | null | 10.1142/S0218271821500024 | FU-PCG-70 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We explore the Lagrangian equation in the background of generalized
uncertainty principle. The tunneling radiation through the black ring horizon
is observed. We investigated the tunneling radiation through the
Hamilton-Jacobi method for solutions of Einstein-Maxwell-dilation gravity
theory. The radiation of black ri... | [
{
"created": "Tue, 19 Jan 2021 06:17:59 GMT",
"version": "v1"
}
] | 2021-01-20 | [
[
"Ali",
"Riasat",
""
],
[
"Bamba",
"Kazuharu",
""
],
[
"Asgher",
"Muhammad",
""
],
[
"Shah",
"Syed Asif Ali",
""
]
] | We explore the Lagrangian equation in the background of generalized uncertainty principle. The tunneling radiation through the black ring horizon is observed. We investigated the tunneling radiation through the Hamilton-Jacobi method for solutions of Einstein-Maxwell-dilation gravity theory. The radiation of black ring... |
2011.08179 | Subhodeep Sarkar | Srijit Bhattacharjee, Subhodeep Sarkar, Arpan Bhattacharyya | Scalar perturbations of black holes in Jackiw-Teitelboim gravity | 16 pages, 3 figures, two-column revtex-4 format. Minor changes in the
abstract, introduction and discussion, appendix and references added, typos
corrected. Published in Physical Review D | Phys. Rev. D 103, 024008 (2021) | 10.1103/PhysRevD.103.024008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study linear scalar perturbations of black holes in two-dimensional (2D)
gravity models with a particular emphasis on Jackiw-Teitelboim (JT) gravity. We
obtain an exact expression of the quasinormal mode frequencies for single
horizon black holes in JT gravity and then verify it numerically using the
Horowitz-Hube... | [
{
"created": "Sat, 14 Nov 2020 20:26:04 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jan 2021 23:00:57 GMT",
"version": "v2"
}
] | 2021-01-13 | [
[
"Bhattacharjee",
"Srijit",
""
],
[
"Sarkar",
"Subhodeep",
""
],
[
"Bhattacharyya",
"Arpan",
""
]
] | We study linear scalar perturbations of black holes in two-dimensional (2D) gravity models with a particular emphasis on Jackiw-Teitelboim (JT) gravity. We obtain an exact expression of the quasinormal mode frequencies for single horizon black holes in JT gravity and then verify it numerically using the Horowitz-Hubeny... |
1003.2383 | Alexis Larranaga PhD | Alexis Larranaga | Entropy Corrections for a Charged Black Hole of String Theory | 7 pages. Corrected references | Commun. Theor. Phys. 55, 1 (2011) 72-74 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the entropy of the Gibbons-Maeda-Garfinkle-Horowitz-Strominger
(GMGHS) charged black hole, originated from the effective action that emerges
in the low-energy of string theory, beyond semiclassical approximations.
Applying the properties of exact differentials for three variables to the first
law thermodynam... | [
{
"created": "Thu, 11 Mar 2010 18:20:11 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2010 15:45:11 GMT",
"version": "v2"
}
] | 2011-01-04 | [
[
"Larranaga",
"Alexis",
""
]
] | We study the entropy of the Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) charged black hole, originated from the effective action that emerges in the low-energy of string theory, beyond semiclassical approximations. Applying the properties of exact differentials for three variables to the first law thermodynamic... |
1401.2136 | Elias C. Vagenas | Leonardo Balart, Elias C. Vagenas | Regular black hole metrics and the weak energy condition | v1: 11 pages, LaTeX, no figures; v2: typos corrected and one
reference removed to match published version in Phys. Lett. B | Phys. Lett. B 730 (2014) 14 | 10.1016/j.physletb.2014.01.024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we construct a family of spherically symmetric, static, charged
regular black hole metrics in the context of Einstein-nonlinear electrodynamics
theory. The construction of the charged regular black hole metrics is based on
three requirements: (a) the weak energy condition should be satisfied, (b) the
ene... | [
{
"created": "Thu, 9 Jan 2014 19:54:38 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jan 2014 19:14:07 GMT",
"version": "v2"
}
] | 2014-01-23 | [
[
"Balart",
"Leonardo",
""
],
[
"Vagenas",
"Elias C.",
""
]
] | In this work we construct a family of spherically symmetric, static, charged regular black hole metrics in the context of Einstein-nonlinear electrodynamics theory. The construction of the charged regular black hole metrics is based on three requirements: (a) the weak energy condition should be satisfied, (b) the energ... |
gr-qc/9910007 | Thomas Thiemann | T. Thiemann | The reduced phase space of spherically symmetric Einstein-Maxwell theory
including a cosmological constant | 37p, LATEX | Nucl.Phys.B436:681-720,1995 | 10.1016/0550-3213(94)00564-U | PITHA 93-32 | gr-qc | null | We extend here the canonical treatment of spherically symmetric (quantum)
gravity to the most simple matter coupling, namely spherically symmetric
Maxwell theory with or without a cosmological constant. The quantization is
based on the reduced phase space which is coordinatized by the mass and the
electric charge as ... | [
{
"created": "Mon, 4 Oct 1999 17:01:20 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Thiemann",
"T.",
""
]
] | We extend here the canonical treatment of spherically symmetric (quantum) gravity to the most simple matter coupling, namely spherically symmetric Maxwell theory with or without a cosmological constant. The quantization is based on the reduced phase space which is coordinatized by the mass and the electric charge as we... |
2311.13557 | Ashmita Das | Ashmita Das, Soham Sen and Sunandan Gangopadhyay | Horizon brightened accelerated radiation in the background of braneworld
black holes | 13 pages, 2 figures | Phys. Rev. D 109 (2024) 064087 | 10.1103/PhysRevD.109.064087 | null | gr-qc hep-ph hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | The concept of horizon brightened acceleration radiation (HBAR) has brought
to us a distinct mechanism of particle production in curved spacetime. In this
manuscript we examine the HBAR phenomena for a braneworld black hole (BBH)
which emerges as an effective theory in our $(3+1)$ dimensional universe due to
the high... | [
{
"created": "Wed, 22 Nov 2023 18:00:53 GMT",
"version": "v1"
}
] | 2024-03-29 | [
[
"Das",
"Ashmita",
""
],
[
"Sen",
"Soham",
""
],
[
"Gangopadhyay",
"Sunandan",
""
]
] | The concept of horizon brightened acceleration radiation (HBAR) has brought to us a distinct mechanism of particle production in curved spacetime. In this manuscript we examine the HBAR phenomena for a braneworld black hole (BBH) which emerges as an effective theory in our $(3+1)$ dimensional universe due to the higher... |
2306.14502 | Mouhssine Koussour | S.A. Narawade, M. Koussour, and B. Mishra | Observational Constraints on Hybrid Scale Factor in f(Q,T) Gravity with
Anisotropic Space-Time | Annalen Der Physik published version | Annalen Der Physik, (2023) 2300161 | 10.1002/andp.202300161 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present an accelerating cosmological model by constraining
the free parameters using the cosmological datasets in an extended symmetric
teleparallel gravity for the flat and anisotropic space-time. We employ a time
variable deceleration parameter that behaves early deceleration and late time
acceler... | [
{
"created": "Mon, 26 Jun 2023 08:19:20 GMT",
"version": "v1"
}
] | 2023-06-27 | [
[
"Narawade",
"S. A.",
""
],
[
"Koussour",
"M.",
""
],
[
"Mishra",
"B.",
""
]
] | In this paper, we present an accelerating cosmological model by constraining the free parameters using the cosmological datasets in an extended symmetric teleparallel gravity for the flat and anisotropic space-time. We employ a time variable deceleration parameter that behaves early deceleration and late time accelerat... |
1910.10931 | Tanima Duary | Tanima Duary and Narayan Banerjee | Brans-Dicke Cosmology: Thermodynamic viability | 8 pages, to appear in EPJP | Eur. Phys. J. Plus (2020) 135: 4 | 10.1140/epjp/s13360-019-00078-z | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Brans-Dicke cosmological models for a spatially isotropic and homogeneous
universe are tested in terms of the validity of the Generalized Second Law of
Thermodynamics (GSL). The investigation is carried out in the Einstein frame.
It is found that the models are thermodynamically viable for negative values of
the Bran... | [
{
"created": "Thu, 24 Oct 2019 06:28:01 GMT",
"version": "v1"
}
] | 2022-05-19 | [
[
"Duary",
"Tanima",
""
],
[
"Banerjee",
"Narayan",
""
]
] | Brans-Dicke cosmological models for a spatially isotropic and homogeneous universe are tested in terms of the validity of the Generalized Second Law of Thermodynamics (GSL). The investigation is carried out in the Einstein frame. It is found that the models are thermodynamically viable for negative values of the Brans-... |
gr-qc/0310136 | Ajay Patwardhan | Ajay Patwardhan | Non commutative quantum spacetime with topological vortex states, and
dark matter in the universe | 7 pages, no figures. ajay@imsc.res.in | null | null | null | gr-qc hep-th | null | Non commutative geometry is creating new possibilities for physics. Quantum
spacetime geometry and post inflationary models of the universe with matter
creation have an enormous range of scales of time, distance and energy in
between. There is a variety of physics possible till the nucleosynthesis epoch
is reached. T... | [
{
"created": "Fri, 31 Oct 2003 17:12:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Patwardhan",
"Ajay",
""
]
] | Non commutative geometry is creating new possibilities for physics. Quantum spacetime geometry and post inflationary models of the universe with matter creation have an enormous range of scales of time, distance and energy in between. There is a variety of physics possible till the nucleosynthesis epoch is reached. The... |
1112.5488 | Deborah A. Konkowski | D.A. Konkowski and T.M. Helliwell | Quantum singularities in static and conformally static space-times | 16 pages, no figures, 8th Friedmann Seminar, Rio de Janeiro, Brazil,
30 May - 3 June, 2011 | International Journal of Modern Physics A, Vol.26, No.22 (2011)
3878-3888 | 10.1142/S0217751X11054334 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The definition of quantum singularity is extended from static space-times to
conformally static space-times. After the usual definitions of classical and
quantum singularities are reviewed, examples of quantum singularities in static
space-times are given. These include asymptotically power-law space-times,
space-tim... | [
{
"created": "Thu, 22 Dec 2011 23:34:21 GMT",
"version": "v1"
}
] | 2011-12-26 | [
[
"Konkowski",
"D. A.",
""
],
[
"Helliwell",
"T. M.",
""
]
] | The definition of quantum singularity is extended from static space-times to conformally static space-times. After the usual definitions of classical and quantum singularities are reviewed, examples of quantum singularities in static space-times are given. These include asymptotically power-law space-times, space-times... |
2208.10268 | Joshua Erlich | Joshua Erlich | A First Analysis of Stochastic Composite Gravity | 6 pages, 2 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a first analysis of a nonperturbative approach to quantum gravity
based on a representation of quantum field theory in terms of stochastic
processes. The stochastic description accommodates a physical Lorentz-invariant
ultraviolet regulator that provides a novel description of physics at
ultra-short distan... | [
{
"created": "Fri, 19 Aug 2022 00:48:54 GMT",
"version": "v1"
}
] | 2022-08-23 | [
[
"Erlich",
"Joshua",
""
]
] | We present a first analysis of a nonperturbative approach to quantum gravity based on a representation of quantum field theory in terms of stochastic processes. The stochastic description accommodates a physical Lorentz-invariant ultraviolet regulator that provides a novel description of physics at ultra-short distance... |
gr-qc/0412089 | Farhad Darabi | F. Darabi, A. Rezaei-Aghdam, A. R. Rastkar | Noncommutativity in quantum cosmology and the Hierarchy problem | 7 pages; Title, abstract and text changed; references added; to
appear in PLB | Phys.Lett.B615:141-145,2005 | 10.1016/j.physletb.2005.04.036 | null | gr-qc hep-th | null | We study the quantum cosmology of an empty (4+1)-dimensional Kaluza-Klein
cosmology with a negative cosmological constant and a FRW type metric with two
scale factors, one for 4-D universe and the other for one compact extra
dimension. By assuming the noncommutativity in the corresponding
mini-superspace we suggest a... | [
{
"created": "Sun, 19 Dec 2004 07:08:12 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Feb 2005 12:56:40 GMT",
"version": "v2"
},
{
"created": "Wed, 4 May 2005 08:25:37 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Darabi",
"F.",
""
],
[
"Rezaei-Aghdam",
"A.",
""
],
[
"Rastkar",
"A. R.",
""
]
] | We study the quantum cosmology of an empty (4+1)-dimensional Kaluza-Klein cosmology with a negative cosmological constant and a FRW type metric with two scale factors, one for 4-D universe and the other for one compact extra dimension. By assuming the noncommutativity in the corresponding mini-superspace we suggest a s... |
1805.07148 | Sudipta Das | Sudipta Das, Abdulla Al Mamon, Manisha Banerjee | A new parametrization of dark energy equation of state leading to double
exponential potential | 10 pages, 13 figures, Accepted for publication in Research in
Astronomy and Astrophysics | null | 10.1088/1674-4527/18/11/131 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a canonical scalar field with a phenomenological form of energy
density or equivalently an equation of state parameter can provide the required
transition from decelerated ($q>0$) to accelerated expansion ($q<0$) phase of
the universe. We have used the latest Type Ia Supernova (SNIa) and Hubble
parameter... | [
{
"created": "Fri, 18 May 2018 11:29:31 GMT",
"version": "v1"
}
] | 2018-11-07 | [
[
"Das",
"Sudipta",
""
],
[
"Mamon",
"Abdulla Al",
""
],
[
"Banerjee",
"Manisha",
""
]
] | We show that a canonical scalar field with a phenomenological form of energy density or equivalently an equation of state parameter can provide the required transition from decelerated ($q>0$) to accelerated expansion ($q<0$) phase of the universe. We have used the latest Type Ia Supernova (SNIa) and Hubble parameter d... |
1708.04569 | Luciano Combi | Luciano Combi and Gustavo E. Romero | Is Teleparallel Gravity really equivalent to General Relativity? | 21 pages, accepted for publication in Annalen der Physik | null | 10.1002/andp.201700175 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An axiomatization of the so-called Teleparallel Equivalent to General
Relativity is presented. A set of formal and semantic postulates are elaborated
from where the physical meaning of various key concepts of the theory are
clarified. These concepts include those of inertia, Lorentz and diffeomorphism
invariance, and... | [
{
"created": "Tue, 15 Aug 2017 15:56:03 GMT",
"version": "v1"
}
] | 2017-11-27 | [
[
"Combi",
"Luciano",
""
],
[
"Romero",
"Gustavo E.",
""
]
] | An axiomatization of the so-called Teleparallel Equivalent to General Relativity is presented. A set of formal and semantic postulates are elaborated from where the physical meaning of various key concepts of the theory are clarified. These concepts include those of inertia, Lorentz and diffeomorphism invariance, and r... |
1902.05858 | Taylor Ordines | Taylor M. Ordines and Eric D. Carlson | Limits on $f(R,T)$ Gravity from Earth's Atmosphere | 2 figures, version accepted for publication | Phys. Rev. D 99, 104052 (2019) | 10.1103/PhysRevD.99.104052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate changes in Earth's atmospheric models coming from the $f(R,T)$
modified theory of gravity, in which the gravitational Lagrangian is given by
an arbitrary function of the Ricci scalar and the trace of the stress-energy
tensor. We obtain a generic form for the gravitational field equations and
derive the... | [
{
"created": "Fri, 15 Feb 2019 15:45:53 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Feb 2019 15:28:54 GMT",
"version": "v2"
},
{
"created": "Fri, 3 May 2019 14:09:42 GMT",
"version": "v3"
}
] | 2019-05-29 | [
[
"Ordines",
"Taylor M.",
""
],
[
"Carlson",
"Eric D.",
""
]
] | We investigate changes in Earth's atmospheric models coming from the $f(R,T)$ modified theory of gravity, in which the gravitational Lagrangian is given by an arbitrary function of the Ricci scalar and the trace of the stress-energy tensor. We obtain a generic form for the gravitational field equations and derive the h... |
1606.05264 | Amalaya Khurshudyan | M. Khurshudyan | On a holographic dark energy model with a Nojiri-Odintsov cut-off in
general relativity | Accepted in Astrophysics and Space Science | null | 10.1007/s10509-016-2821-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider the models of the accelerated expanding large scale
universe~(according to general relativity) containing a generalized holographic
dark energy with a Nojiri - Odintsov cut - off. The second component of the
darkness is assumed to be the pressureless cold dark matter according to
observed sy... | [
{
"created": "Wed, 15 Jun 2016 06:45:14 GMT",
"version": "v1"
}
] | 2016-06-29 | [
[
"Khurshudyan",
"M.",
""
]
] | In this paper we consider the models of the accelerated expanding large scale universe~(according to general relativity) containing a generalized holographic dark energy with a Nojiri - Odintsov cut - off. The second component of the darkness is assumed to be the pressureless cold dark matter according to observed symm... |
2111.00952 | Alkiviadis Triantafyllopoulos | E. Kapsabelis, A. Triantafyllopoulos, S. Basilakos and P. C. Stavrinos | Applications of the Schwarzschild-Finsler-Randers model | 11 pages, 6 figures, to appear in European Physical Journal C | Eur. Phys. J. C 81 (2021) 990 | 10.1140/epjc/s10052-021-09790-6 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this article, we study further applications of the
Schwarzschild-Finsler-Randers (SFR) model which was introduced in a previous
work. In this model, we investigate curvatures and the generalized Kretschmann
invariant which plays a crucial role for singularities. In addition, the
derived path equations are used for... | [
{
"created": "Mon, 1 Nov 2021 13:50:29 GMT",
"version": "v1"
}
] | 2021-11-19 | [
[
"Kapsabelis",
"E.",
""
],
[
"Triantafyllopoulos",
"A.",
""
],
[
"Basilakos",
"S.",
""
],
[
"Stavrinos",
"P. C.",
""
]
] | In this article, we study further applications of the Schwarzschild-Finsler-Randers (SFR) model which was introduced in a previous work. In this model, we investigate curvatures and the generalized Kretschmann invariant which plays a crucial role for singularities. In addition, the derived path equations are used for t... |
2007.03464 | She-Sheng Xue | She-Sheng Xue | Holographic and massive pair plasma state in Friedman Universe:
baryogenesis, magnetogenesis, and dark-matter wave | 31 pages, 2 captioned figures. The article follows arXiv:2006.15622 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Quantum massive particle and antiparticle pair production and oscillation
result in a holographic and massive pair plasma state in reheating. Particle
and antiparticle densities perturbations in the plasma form the acoustic waves
of particle-antiparticle symmetric and asymmetric densities. We derive wave
equations an... | [
{
"created": "Sun, 5 Jul 2020 16:41:48 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2023 09:19:17 GMT",
"version": "v2"
}
] | 2023-04-18 | [
[
"Xue",
"She-Sheng",
""
]
] | Quantum massive particle and antiparticle pair production and oscillation result in a holographic and massive pair plasma state in reheating. Particle and antiparticle densities perturbations in the plasma form the acoustic waves of particle-antiparticle symmetric and asymmetric densities. We derive wave equations and ... |
2203.13845 | Robin Croft Mr. | Robin Croft | Local Continuity of Angular Momentum and Noether Charge for Matter in
General Relativity | 14 pages, 9 figures | null | 10.1088/1361-6382/accc6a | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conservation laws have many applications in numerical relativity. However, it
is not straightforward to define local conservation laws for general dynamic
spacetimes due the lack of coordinate translation symmetries. In flat space,
the rate of change of energy-momentum within a finite spacelike volume is
equivalent t... | [
{
"created": "Fri, 25 Mar 2022 18:24:53 GMT",
"version": "v1"
}
] | 2023-05-03 | [
[
"Croft",
"Robin",
""
]
] | Conservation laws have many applications in numerical relativity. However, it is not straightforward to define local conservation laws for general dynamic spacetimes due the lack of coordinate translation symmetries. In flat space, the rate of change of energy-momentum within a finite spacelike volume is equivalent to ... |
1408.2403 | Partha Ghose Professor | Partha Ghose | Unification of Gravity and Electromagnetism I: Mach's Principle and
Cosmology | 14 pages; some additional material; affiliation changed | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The phenomenological consequences of unification of Einstein gravity and
electromagnetism in an early phase of a Machian universe with a very small and
uniform electrical charge density $\rho_q$ are explored. A form of the Strong
Equivalence Principle for unified electrogravity is first formulated, and it
immediately... | [
{
"created": "Tue, 5 Aug 2014 08:02:50 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Aug 2014 06:29:22 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Feb 2015 10:12:17 GMT",
"version": "v3"
},
{
"created": "Thu, 12 Feb 2015 08:03:22 GMT",
"version": "v4"
}
] | 2015-02-13 | [
[
"Ghose",
"Partha",
""
]
] | The phenomenological consequences of unification of Einstein gravity and electromagnetism in an early phase of a Machian universe with a very small and uniform electrical charge density $\rho_q$ are explored. A form of the Strong Equivalence Principle for unified electrogravity is first formulated, and it immediately l... |
1505.03915 | Peter Zimmerman | Peter Zimmerman | Gravitational self-force in non-vacuum spacetimes: an effective field
theory derivation | 41 pages. Submitted to PRD | null | 10.1103/PhysRevD.92.064040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the motion of small compact objects in
non-vacuum spacetimes using methods from effective field theory in curved
spacetime. Although a vacuum formulation is sufficient in many astrophysical
contexts, there are applications such as the role of the self-force in
enforcing cosmic-censorship ... | [
{
"created": "Thu, 14 May 2015 23:07:35 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jul 2015 18:09:51 GMT",
"version": "v2"
}
] | 2015-10-28 | [
[
"Zimmerman",
"Peter",
""
]
] | In this paper we investigate the motion of small compact objects in non-vacuum spacetimes using methods from effective field theory in curved spacetime. Although a vacuum formulation is sufficient in many astrophysical contexts, there are applications such as the role of the self-force in enforcing cosmic-censorship in... |
gr-qc/0512068 | Ernest Matagne | E. Matagne | Algebraic decomposition of the electromagnetic constitutive tensor. A
step toward pre-metric based gravitation? | 12 pages, PDF only | Annalen Phys.17:17-27,1997 | 10.1002/andp.200710272 | null | gr-qc | null | It is known that the electromagnetic constitutive tensor can be algebraically
decomposed in three parts: the so-called principal part, the axion part and the
skewon part (see gr-qc/0506042). The aim of this paper is to provide a deeper
decomposition of the principal part.
| [
{
"created": "Mon, 12 Dec 2005 10:04:19 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2008 10:01:19 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Matagne",
"E.",
""
]
] | It is known that the electromagnetic constitutive tensor can be algebraically decomposed in three parts: the so-called principal part, the axion part and the skewon part (see gr-qc/0506042). The aim of this paper is to provide a deeper decomposition of the principal part. |
2310.19900 | Jaros{\l}aw Kopi\'nski | Jaros{\l}aw Kopi\'nski, Alberto Soria and Juan A. Valiente Kroon | New spinorial mass-quasilocal angular momentum inequality for initial
data with marginally future trapped surface | 13 pages | J. Math. Phys. 65, 042501 (2024) | 10.1063/5.0185930 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We prove a new geometric inequality that relates the Arnowitt-Deser-Misner
mass of initial data to a quasilocal angular momentum of a marginally future
trapped surface inner boundary. The inequality is expressed in terms of a
1-spinor, which satisfies an intrinsic first-order Dirac-type equation.
Furthermore, we show... | [
{
"created": "Mon, 30 Oct 2023 18:10:24 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2024 17:13:29 GMT",
"version": "v2"
}
] | 2024-04-17 | [
[
"Kopiński",
"Jarosław",
""
],
[
"Soria",
"Alberto",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | We prove a new geometric inequality that relates the Arnowitt-Deser-Misner mass of initial data to a quasilocal angular momentum of a marginally future trapped surface inner boundary. The inequality is expressed in terms of a 1-spinor, which satisfies an intrinsic first-order Dirac-type equation. Furthermore, we show t... |
1411.0460 | Wei-Tou Ni | Wei-Tou Ni | Spacetime structure and asymmetric metric from the premetric formulation
of electromagnetism | 22 pages, 2 tables | Physics Letters A Vol. 379, Issues 20-21, 3 July 2015, Pages
1297-1303 | 10.1016/j.physleta.2015.03.004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After reviewing the construction of metric from premetric electrodynamics
with empirical improvement of accuracy in the skewonless case, we explore the
role of skewons in the construction of spacetime metric in the full premetric
electrodynamics. For metric principal part plus skewon part, we have shown that
the Type... | [
{
"created": "Mon, 3 Nov 2014 12:39:11 GMT",
"version": "v1"
}
] | 2015-11-13 | [
[
"Ni",
"Wei-Tou",
""
]
] | After reviewing the construction of metric from premetric electrodynamics with empirical improvement of accuracy in the skewonless case, we explore the role of skewons in the construction of spacetime metric in the full premetric electrodynamics. For metric principal part plus skewon part, we have shown that the Type I... |
gr-qc/0505069 | Mariusz Dabrowski P. | Mariusz P. Dabrowski | Statefinders, higher-order energy conditions and sudden future
singularities | LATEX, 11 pages, no figures, version to appear in Phys. Lett. B | Phys.Lett. B625 (2005) 184-188 | 10.1016/j.physletb.2005.08.080 | null | gr-qc astro-ph hep-th | null | We link observational parameters such as the deceleration parameter, the
jerk, the kerk (snap) and higher-order derivatives of the scale factor, called
statefinders, to the conditions which allow to develop sudden future
singularities of pressure with finite energy density. In this context, and
within the framework o... | [
{
"created": "Fri, 13 May 2005 14:51:43 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jul 2005 14:17:53 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Aug 2005 12:39:42 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Dabrowski",
"Mariusz P.",
""
]
] | We link observational parameters such as the deceleration parameter, the jerk, the kerk (snap) and higher-order derivatives of the scale factor, called statefinders, to the conditions which allow to develop sudden future singularities of pressure with finite energy density. In this context, and within the framework of ... |
gr-qc/0512024 | Benedict Carter | Benedict M.N. Carter and Alex B. Nielsen | Series solutions for a static scalar potential in a Salam-Sezgin
Supergravitational hybrid braneworld | 5 pages, no figures | Gen.Rel.Grav.37:1629-1634,2005 | 10.1007/s10714-005-0140-x | null | gr-qc | null | The static potential for a massless scalar field shares the essential
features of the scalar gravitational mode in a tensorial perturbation analysis
about the background solution. Using the fluxbrane construction of [8] we
calculate the lowest order of the static potential of a massless scalar field
on a thin brane u... | [
{
"created": "Mon, 5 Dec 2005 04:21:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Carter",
"Benedict M. N.",
""
],
[
"Nielsen",
"Alex B.",
""
]
] | The static potential for a massless scalar field shares the essential features of the scalar gravitational mode in a tensorial perturbation analysis about the background solution. Using the fluxbrane construction of [8] we calculate the lowest order of the static potential of a massless scalar field on a thin brane usi... |
1204.4299 | Giuseppe Congedo | Giuseppe Congedo | Spacetime Metrology with LISA Pathfinder | PhD thesis defended at University of Trento on 26th March 2012.
Advisors: Stefano Vitale, Mauro Hueller. Committee: Eugenio Coccia (Univ. of
Rome, Tor Vergata), Philippe Jetzer (Univ. of Z\"urich), Eric Plagnol
(APC-CNRS, Paris), Rita Dolesi (Univ. Of Trento) | null | null | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | LISA is the proposed ESA-NASA gravitational wave detector in the 0.1 mHz -
0.1 Hz band. LISA Pathfinder is the down-scaled version of a single LISA arm.
The arm -- named Doppler link -- can be treated as a differential
accelerometer, measuring the relative acceleration between test masses. LISA
Pathfinder -- the in-f... | [
{
"created": "Thu, 19 Apr 2012 09:53:15 GMT",
"version": "v1"
}
] | 2012-04-20 | [
[
"Congedo",
"Giuseppe",
""
]
] | LISA is the proposed ESA-NASA gravitational wave detector in the 0.1 mHz - 0.1 Hz band. LISA Pathfinder is the down-scaled version of a single LISA arm. The arm -- named Doppler link -- can be treated as a differential accelerometer, measuring the relative acceleration between test masses. LISA Pathfinder -- the in-fli... |
2010.09595 | Ibrahim G\"ull\"u | S. Danial Forghani, Ibrahim Gullu, S. Habib Mazharimousavi | A Geometrical Model for the Evolution of Spherical Planetary Nebulae
Based on Thin-Shell Formalism | 6 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spherical planetary nebula is described as a geometric model. The nebula
itself is considered as a thin-shell which visualized as a boundary of two
spacetimes. The inner and outer curvature tensors of the thin-shell are found
in order to get an expression of the energy-momentum tensor on the thin-shell.
The energy ... | [
{
"created": "Mon, 19 Oct 2020 15:20:42 GMT",
"version": "v1"
}
] | 2020-10-20 | [
[
"Forghani",
"S. Danial",
""
],
[
"Gullu",
"Ibrahim",
""
],
[
"Mazharimousavi",
"S. Habib",
""
]
] | A spherical planetary nebula is described as a geometric model. The nebula itself is considered as a thin-shell which visualized as a boundary of two spacetimes. The inner and outer curvature tensors of the thin-shell are found in order to get an expression of the energy-momentum tensor on the thin-shell. The energy de... |
1109.0131 | Vicente Jos\'e Bol\'os | Vicente J. Bol\'os | A note on the computation of geometrically defined relative velocities | 8 pages, 2 figures | Gen. Relativ. Gravit. 44 (2012), no. 2, 391-400 | 10.1007/s10714-011-1278-3 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss some aspects about the computation of kinematic, spectroscopic,
Fermi and astrometric relative velocities that are geometrically defined in
general relativity. Mainly, we state that kinematic and spectroscopic relative
velocities only depend on the 4-velocities of the observer and the test
particle, unlike... | [
{
"created": "Thu, 1 Sep 2011 09:02:05 GMT",
"version": "v1"
}
] | 2012-02-07 | [
[
"Bolós",
"Vicente J.",
""
]
] | We discuss some aspects about the computation of kinematic, spectroscopic, Fermi and astrometric relative velocities that are geometrically defined in general relativity. Mainly, we state that kinematic and spectroscopic relative velocities only depend on the 4-velocities of the observer and the test particle, unlike F... |
2005.14571 | Alexandros Karam Dr. | Laur J\"arv, Alexandros Karam, Aleksander Kozak, Angelos Lykkas,
Antonio Racioppi, and Margus Saal | Equivalence of inflationary models between the metric and Palatini
formulation of scalar-tensor theories | PRD accepted, title modified per journal's request, discussion and
examples expanded, references added | Phys. Rev. D 102, 044029 (2020) | 10.1103/PhysRevD.102.044029 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With a scalar field non-minimally coupled to curvature, the underlying
geometry and variational principle of gravity - metric or Palatini - becomes
important and makes a difference, as the field dynamics and observational
predictions generally depend on this choice. In the present paper we describe a
classification p... | [
{
"created": "Fri, 29 May 2020 13:43:28 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Aug 2020 15:21:52 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"Järv",
"Laur",
""
],
[
"Karam",
"Alexandros",
""
],
[
"Kozak",
"Aleksander",
""
],
[
"Lykkas",
"Angelos",
""
],
[
"Racioppi",
"Antonio",
""
],
[
"Saal",
"Margus",
""
]
] | With a scalar field non-minimally coupled to curvature, the underlying geometry and variational principle of gravity - metric or Palatini - becomes important and makes a difference, as the field dynamics and observational predictions generally depend on this choice. In the present paper we describe a classification pri... |
2110.07258 | Emmanuil Saridakis | Kimet Jusufi, Mustapha Azreg-A\"inou, Mubasher Jamil, Emmanuel N.
Saridakis | Constraints on Barrow entropy from M87* and S2 star observations | 10 pages, 6 figures, 1 table, version to appear in Universe, as
invited contribution to the Special Issue "Large Scale Structure of the
Universe" | Universe 8 (2022) 2, 102 | 10.3390/universe8020102 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use data from M87* central black hole shadow, as well as from the S2 star
observations, in order to extract constraints on Barrow entropy. The latter is
a modified entropy arising from quantum-gravitational effects on the black hole
horizon, quantified by the new parameter $\Delta$. Such a change in entropy
leads ... | [
{
"created": "Thu, 14 Oct 2021 11:09:36 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jan 2022 14:22:51 GMT",
"version": "v2"
}
] | 2022-02-08 | [
[
"Jusufi",
"Kimet",
""
],
[
"Azreg-Aïnou",
"Mustapha",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We use data from M87* central black hole shadow, as well as from the S2 star observations, in order to extract constraints on Barrow entropy. The latter is a modified entropy arising from quantum-gravitational effects on the black hole horizon, quantified by the new parameter $\Delta$. Such a change in entropy leads to... |
2408.02051 | Sneha Pradhan | Sneha Pradhan, Sunil Kumar Maurya, Pradyumn Kumar Sahoo, Ghulam
Mustafa | Geometrically deformed charged anisotropic models in $f(Q,T)$ gravity | Fortschritte der Physik published version | Fortschritte der Physik (2024) 2400092 | 10.1002/prop.202400092 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this study, we developed the geometrically deformed compact objects in the
$f(Q, T)$ gravity theory under an electric field through gravitational
decoupling via. minimal geometric deformation (MGD) technique for the first
time. The decoupled field equations are solved via two different mimic
approaches $\theta_0^0... | [
{
"created": "Sun, 4 Aug 2024 14:59:20 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Pradhan",
"Sneha",
""
],
[
"Maurya",
"Sunil Kumar",
""
],
[
"Sahoo",
"Pradyumn Kumar",
""
],
[
"Mustafa",
"Ghulam",
""
]
] | In this study, we developed the geometrically deformed compact objects in the $f(Q, T)$ gravity theory under an electric field through gravitational decoupling via. minimal geometric deformation (MGD) technique for the first time. The decoupled field equations are solved via two different mimic approaches $\theta_0^0 =... |
2202.13308 | Leo Medeiros Gouvea | J. Bezerra-Sobrinho, L. G. Medeiros | Modified Starobinsky inflation by the $R\ln\left( \square\right) R$ term | 22 pages, 3 figures; v3: matches the published version | JCAP01(2023)039 | 10.1088/1475-7516/2023/01/039 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of effective theories of gravity, a minimalist bottom-up
approach which takes into account $1$-loop quantum corrections leads to
modifications in the Einstein-Hilbert action through the inclusion of four
extra terms: $R^{2}$, $C_{\kappa\rho\alpha\beta}C^{\kappa\rho\alpha\beta}$,
$R\ln\left( \square\rig... | [
{
"created": "Sun, 27 Feb 2022 08:05:26 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Mar 2022 05:21:49 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Jan 2023 18:12:25 GMT",
"version": "v3"
}
] | 2023-01-27 | [
[
"Bezerra-Sobrinho",
"J.",
""
],
[
"Medeiros",
"L. G.",
""
]
] | In the context of effective theories of gravity, a minimalist bottom-up approach which takes into account $1$-loop quantum corrections leads to modifications in the Einstein-Hilbert action through the inclusion of four extra terms: $R^{2}$, $C_{\kappa\rho\alpha\beta}C^{\kappa\rho\alpha\beta}$, $R\ln\left( \square\right... |
0706.2286 | Philippe Grandclement | Philippe Grandclement (LUTH), J\'er\^ome Novak (LUTH) | Spectral Methods for Numerical Relativity | This new version has been accepted for publication in Living Reviews
in Relativity | Living Reviews in Relativity (2009) lrr-1009-1 | 10.12942/lrr-2009-1 | null | gr-qc math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Equations arising in General Relativity are usually too complicated to be
solved analytically and one has to rely on numerical methods to solve sets of
coupled partial differential equations. Among the possible choices, this paper
focuses on a class called spectral methods where, typically, the various
functions are ... | [
{
"created": "Fri, 15 Jun 2007 12:41:39 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Oct 2008 12:05:35 GMT",
"version": "v2"
}
] | 2016-06-22 | [
[
"Grandclement",
"Philippe",
"",
"LUTH"
],
[
"Novak",
"Jérôme",
"",
"LUTH"
]
] | Equations arising in General Relativity are usually too complicated to be solved analytically and one has to rely on numerical methods to solve sets of coupled partial differential equations. Among the possible choices, this paper focuses on a class called spectral methods where, typically, the various functions are ex... |
0910.0374 | Vladimir Belinski | V. Belinski | Cosmological singularity | to appear in AIP Conference Proceedings | AIP Conf.Proc.1205:17-25,2009 | 10.1063/1.3382327 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The talk at international conference in honor of Ya. B. Zeldovich 95th
Anniversary, Minsk, Belarus, April 2009. The talk represents a review of the
old results and contemporary development on the problem of cosmological
singularity.
| [
{
"created": "Fri, 2 Oct 2009 11:06:16 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Belinski",
"V.",
""
]
] | The talk at international conference in honor of Ya. B. Zeldovich 95th Anniversary, Minsk, Belarus, April 2009. The talk represents a review of the old results and contemporary development on the problem of cosmological singularity. |
gr-qc/0310080 | Ujjal Debnath | Ujjal Debnath, Soma Nath, Subenoy Chakraborty | Non-adiabatic collapse of a quasi-spherical radiating star | 8 Latex pages, No figures, Revtex style | Gen.Rel.Grav.37:215-223,2005 | 10.1007/s10714-005-0010-6 | null | gr-qc | null | A model is proposed of a collapsing quasi-spherical radiating star with
matter content as shear-free isotropic fluid undergoing radial heat-flow with
outgoing radiation. To describe the radiation of the system, we have considered
both plane symmetric and spherical Vaidya solutions. Physical conditions and
thermodynam... | [
{
"created": "Thu, 16 Oct 2003 07:08:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Debnath",
"Ujjal",
""
],
[
"Nath",
"Soma",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | A model is proposed of a collapsing quasi-spherical radiating star with matter content as shear-free isotropic fluid undergoing radial heat-flow with outgoing radiation. To describe the radiation of the system, we have considered both plane symmetric and spherical Vaidya solutions. Physical conditions and thermodynamic... |
gr-qc/0003008 | Fang-Pei Chen | Fang-Pei Chen | A New Study about the Two Formulations of Conservation Laws for Matter
Plus Gravitational Field and Their Experimental Test | RevTex, 11 pages, no figures | null | null | null | gr-qc | null | The debate on conservation laws in general relativity eighty years ago is
reviewed and restudied. The physical meaning of the identities in the
conservation laws for matter plus gravitational field is reexamined and new
interpretations for gravitational wave are given. The conclusions of these
studies are distinct fr... | [
{
"created": "Thu, 2 Mar 2000 17:43:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chen",
"Fang-Pei",
""
]
] | The debate on conservation laws in general relativity eighty years ago is reviewed and restudied. The physical meaning of the identities in the conservation laws for matter plus gravitational field is reexamined and new interpretations for gravitational wave are given. The conclusions of these studies are distinct from... |
gr-qc/0612033 | Rituparno Goswami | Valeri P. Frolov and Rituparno Goswami | Surface Geometry of 5D Black Holes and Black Rings | 10 pages, 9 figures, Revtex4 | Phys.Rev.D75:124001,2007 | 10.1103/PhysRevD.75.124001 | null | gr-qc hep-th | null | We discuss geometrical properties of the horizon surface of five-dimensional
rotating black holes and black rings. Geometrical invariants characterizing
these 3D geometries are calculated. We obtain a global embedding of the 5D
rotating black horizon surface into a flat space. We also describe the
Kaluza-Klein reduct... | [
{
"created": "Tue, 5 Dec 2006 20:49:27 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Dec 2006 21:01:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Frolov",
"Valeri P.",
""
],
[
"Goswami",
"Rituparno",
""
]
] | We discuss geometrical properties of the horizon surface of five-dimensional rotating black holes and black rings. Geometrical invariants characterizing these 3D geometries are calculated. We obtain a global embedding of the 5D rotating black horizon surface into a flat space. We also describe the Kaluza-Klein reductio... |
gr-qc/9808001 | Jose Wadih Maluf | J. W. Maluf and J. F. da Rocha Neto | General relativity on a null surface: Hamiltonian formulation in the
teleparallel geometry | 15 pages, Latex, no figures, to appear in the Gen. Rel. Grav | Gen.Rel.Grav. 31 (1999) 173-185 | 10.1023/A:1018836025605 | null | gr-qc | null | The Hamiltonian formulation of general relativity on a null surface is
established in the teleparallel geometry. No particular gauge conditons on the
tetrads are imposed, such as the time gauge condition. By means of a 3+1
decomposition the resulting Hamiltonian arises as a completely constrained
system. However, it ... | [
{
"created": "Sun, 2 Aug 1998 18:49:57 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Maluf",
"J. W.",
""
],
[
"Neto",
"J. F. da Rocha",
""
]
] | The Hamiltonian formulation of general relativity on a null surface is established in the teleparallel geometry. No particular gauge conditons on the tetrads are imposed, such as the time gauge condition. By means of a 3+1 decomposition the resulting Hamiltonian arises as a completely constrained system. However, it is... |
1805.00243 | Jack Borthwick | Jack Borthwick | Maximal Kerr de Sitter spacetimes | Corrected typos | 2018 Class. Quantum Grav. 35 215006 | 10.1088/1361-6382/aae3dc | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we propose a survey of the basic geometric properties of
Carters Kerr-de Sitter solution to Einsteins equation with positive
cosmological constant. In particular, we give simple characterisations of the
Kerr-de Sitter analogs of fast, slow and extreme Kerr spacetime and conclude
with a discussion on ma... | [
{
"created": "Tue, 1 May 2018 08:59:30 GMT",
"version": "v1"
},
{
"created": "Sat, 5 May 2018 07:11:03 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Nov 2021 18:23:52 GMT",
"version": "v3"
},
{
"created": "Thu, 16 Jun 2022 07:45:08 GMT",
"version": "v4"
}
] | 2022-06-17 | [
[
"Borthwick",
"Jack",
""
]
] | In this paper, we propose a survey of the basic geometric properties of Carters Kerr-de Sitter solution to Einsteins equation with positive cosmological constant. In particular, we give simple characterisations of the Kerr-de Sitter analogs of fast, slow and extreme Kerr spacetime and conclude with a discussion on maxi... |
1808.10475 | Ogan \"Ozsoy | Maria Mylova, Ogan \"Ozsoy, Susha Parameswaran, Gianmassimo Tasinato,
Ivonne Zavala | A new mechanism to enhance primordial tensor fluctuations in single
field inflation | 23 pages, 3 figures, Typos fixed, Appendix B is revised, published
version | null | 10.1088/1475-7516/2018/12/024 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a new mechanism to enhance the spectrum of primordial tensor
fluctuations in single field inflationary scenarios. The enhancement relies on
a transitory non-attractor inflationary phase, which amplifies the would-be
decaying tensor mode, and gives rise to a growth of tensor fluctuations at
superhorizon sca... | [
{
"created": "Thu, 30 Aug 2018 18:14:21 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Feb 2019 15:19:48 GMT",
"version": "v2"
}
] | 2019-02-22 | [
[
"Mylova",
"Maria",
""
],
[
"Özsoy",
"Ogan",
""
],
[
"Parameswaran",
"Susha",
""
],
[
"Tasinato",
"Gianmassimo",
""
],
[
"Zavala",
"Ivonne",
""
]
] | We discuss a new mechanism to enhance the spectrum of primordial tensor fluctuations in single field inflationary scenarios. The enhancement relies on a transitory non-attractor inflationary phase, which amplifies the would-be decaying tensor mode, and gives rise to a growth of tensor fluctuations at superhorizon scale... |
1803.03301 | Vladimir S. Manko | V. S. Manko, E. Ruiz | Black hole-naked singularity dualism and the repulsion of two Kerr black
holes due to spin-spin interaction | 5 pages, 2 figures: a misprint in formula (3) rectified; published
version | Phys. Lett. B 791, 26 (2019) | 10.1016/j.physletb.2019.02.025 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report about the possibility for interacting Kerr sources to exist in two
different states - black holes or naked singularities - both states
characterized by the same masses and angular momenta. Another surprising
discovery reported by us is that in spite of the absence of balance between two
Kerr black holes, th... | [
{
"created": "Thu, 8 Mar 2018 20:53:40 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jan 2019 19:29:31 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Mar 2019 21:29:04 GMT",
"version": "v3"
}
] | 2019-03-27 | [
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
]
] | We report about the possibility for interacting Kerr sources to exist in two different states - black holes or naked singularities - both states characterized by the same masses and angular momenta. Another surprising discovery reported by us is that in spite of the absence of balance between two Kerr black holes, the ... |
2102.10856 | Aleksandar Mikovic | A. Mikovic and N. Manojlovic | Self-dual cosmological Bianchi IX and VIII metrics | 16 pages | Advances in Theoretical and Mathematical Physics, Vol. 26, No. 8
(2022), pp. 2841-2857 | 10.4310/ATMP.2022.v26.n8.a10 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that self-dual Bianchi IX and VIII cosmological models are described
by the Nahm dynamical system for an appropriate type of matrices. We construct
the general solutions in the case of the diagonal reductions of the
corresponding Nahm equations and give the explicit expressions for the
corresponding self-dual... | [
{
"created": "Mon, 22 Feb 2021 09:43:27 GMT",
"version": "v1"
}
] | 2024-01-17 | [
[
"Mikovic",
"A.",
""
],
[
"Manojlovic",
"N.",
""
]
] | We show that self-dual Bianchi IX and VIII cosmological models are described by the Nahm dynamical system for an appropriate type of matrices. We construct the general solutions in the case of the diagonal reductions of the corresponding Nahm equations and give the explicit expressions for the corresponding self-dual m... |
1408.5064 | Sharmanthie Fernando | Sharmanthie Fernando | Nariai black holes with quintessence | 19 pages and 17 figures | Modern Physics Letters A, Vol(28) (2013) 1350189 | 10.1142/S0217732313501897 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the properties of Schwarzschild black hole surrounded
by quintessence matter. The main objective of the paper is to show the
existence of Nariai type black hole for special values of the parameters in the
theory. The Nariai black hole with the quintessence has the topology $dS_2
\times S_2$ wit... | [
{
"created": "Thu, 21 Aug 2014 16:59:36 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Fernando",
"Sharmanthie",
""
]
] | In this paper we study the properties of Schwarzschild black hole surrounded by quintessence matter. The main objective of the paper is to show the existence of Nariai type black hole for special values of the parameters in the theory. The Nariai black hole with the quintessence has the topology $dS_2 \times S_2$ with ... |
gr-qc/9501005 | Joe Romano | Karel V. Kuchar and Joseph D. Romano | Gravitational Constraints which Generate a Lie Algebra | 10 pages, latex file, no figures | Phys.Rev. D51 (1995) 5579-5582 | 10.1103/PhysRevD.51.5579 | UU-REL-94/1/9 | gr-qc | null | The coupling of gravity to dust helps to discover simple quadratic
combinations of the gravitational super-Hamiltonian and supermomentum whose
Poisson brackets strongly vanish. This leads to a new form of vacuum
constraints which generate a true Lie algebra. We show that the coupling of
gravity to a massless scalar f... | [
{
"created": "Mon, 9 Jan 1995 23:55:02 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Kuchar",
"Karel V.",
""
],
[
"Romano",
"Joseph D.",
""
]
] | The coupling of gravity to dust helps to discover simple quadratic combinations of the gravitational super-Hamiltonian and supermomentum whose Poisson brackets strongly vanish. This leads to a new form of vacuum constraints which generate a true Lie algebra. We show that the coupling of gravity to a massless scalar fie... |
gr-qc/0101097 | J. Brian Pitts | J. Brian Pitts, W. C. Schieve (The University of Texas at Austin) | Light Cone Consistency in Bimetric General Relativity | contribution to the Proceedings of the 20th Texas Symposium on
Relativistic Astrophysics; 3 pages, 1 figure | Relativistic Astrophysics: 20th Texas Symposium, Austin, Texas,
10-15 December 2000, eds. J. Craig Wheeler and Hugo Martel, pp. 763-765. AIP
Conference Proceedings 586, Melville, NY (2001). | 10.1063/1.1419652 | null | gr-qc hep-th | null | General relativity can be formally derived as a flat spacetime theory, but
the consistency of the resulting curved metric's light cone with the flat
metric's null cone has not been adequately considered. If the two are
inconsistent, then gravity is not just another field in flat spacetime after
all.
Here we discuss... | [
{
"created": "Thu, 25 Jan 2001 19:22:36 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Pitts",
"J. Brian",
"",
"The University of Texas at Austin"
],
[
"Schieve",
"W. C.",
"",
"The University of Texas at Austin"
]
] | General relativity can be formally derived as a flat spacetime theory, but the consistency of the resulting curved metric's light cone with the flat metric's null cone has not been adequately considered. If the two are inconsistent, then gravity is not just another field in flat spacetime after all. Here we discuss rec... |
gr-qc/9411045 | Juan Jose Gonzalez | Esteban Calzetta and Juan Jose Gonzalez | Chaos and Semiclassical Limit in Quantum Cosmology | 14 pages in LaTex (RevTex), 6 figures | Phys.Rev. D51 (1995) 6821-6828 | 10.1103/PhysRevD.51.6821 | null | gr-qc | null | In this paper we present a Friedmann-Robertson-Walker cosmological model
conformally coupled to a massive scalar field where the WKB approximation fails
to reproduce the exact solution to the Wheeler-DeWitt equation for large
Universes. The breakdown of the WKB approximation follows the same pattern than
in semiclass... | [
{
"created": "Wed, 16 Nov 1994 22:48:38 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Calzetta",
"Esteban",
""
],
[
"Gonzalez",
"Juan Jose",
""
]
] | In this paper we present a Friedmann-Robertson-Walker cosmological model conformally coupled to a massive scalar field where the WKB approximation fails to reproduce the exact solution to the Wheeler-DeWitt equation for large Universes. The breakdown of the WKB approximation follows the same pattern than in semiclassic... |
1011.5513 | Steffen Gielen | Steffen Gielen | Classical GR as a topological theory with linear constraints | 4 pages, based on a talk given at the Spanish Relativity Meeting 2010
(ERE2010, Granada, Spain) | J.Phys.Conf.Ser.314:012044,2011 | 10.1088/1742-6596/314/1/012044 | AEI-2011-083 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a formulation of continuum 4d gravity in terms of a
constrained topological (BF) theory, in the spirit of the Plebanski
formulation, but involving only linear constraints, of the type used recently
in the spin foam approach to quantum gravity. We identify both the continuum
version of the linear simpli... | [
{
"created": "Wed, 24 Nov 2010 21:13:05 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Sep 2011 20:43:57 GMT",
"version": "v2"
}
] | 2011-11-11 | [
[
"Gielen",
"Steffen",
""
]
] | We investigate a formulation of continuum 4d gravity in terms of a constrained topological (BF) theory, in the spirit of the Plebanski formulation, but involving only linear constraints, of the type used recently in the spin foam approach to quantum gravity. We identify both the continuum version of the linear simplici... |
gr-qc/9909075 | David D. Reid | David D. Reid | Introduction to causal sets: an alternate view of spacetime structure | pedagogical paper; 9 pages + 3 figs; REVTeX | Can.J.Phys. 79 (2001) 1-16 | 10.1139/cjp-79-1-1 | null | gr-qc physics.pop-ph | null | This paper provides a thorough introduction to the causal set hypothesis
aimed at students, and other interested persons, with some knowledge of general
relativity and nonrelativistic quantum mechanics. I elucidate the arguments for
why the causal set structure might be the appropriate structure for a theory of
quant... | [
{
"created": "Wed, 22 Sep 1999 20:46:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Reid",
"David D.",
""
]
] | This paper provides a thorough introduction to the causal set hypothesis aimed at students, and other interested persons, with some knowledge of general relativity and nonrelativistic quantum mechanics. I elucidate the arguments for why the causal set structure might be the appropriate structure for a theory of quantum... |
2002.07057 | Onur U\c{c}anok | Onur U\c{c}anok | Orbits around a Kerr black hole and its shadow | 31 pages, 12 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the full General Theory of Relativity has been unveiled to the
scientific community in 1915, many solutions to the vacuum Einstein field
equations have been found and studied. This paper aims at documenting
exhaustively the derivation of the shape of the patch of the sky that is left
completely black by a spinn... | [
{
"created": "Fri, 14 Feb 2020 11:15:22 GMT",
"version": "v1"
}
] | 2020-02-18 | [
[
"Uçanok",
"Onur",
""
]
] | Since the full General Theory of Relativity has been unveiled to the scientific community in 1915, many solutions to the vacuum Einstein field equations have been found and studied. This paper aims at documenting exhaustively the derivation of the shape of the patch of the sky that is left completely black by a spinnin... |
1703.04163 | Jose Luis Bl\'azquez-Salcedo | Jose Luis Bl\'azquez-Salcedo, Jutta Kunz, Francisco Navarro-L\'erida,
Eugen Radu | AdS$_5$ magnetized solutions in minimal gauged supergravity | 11 pages, 5 figures, typos corrected and references added, matches
version published in PLB | Phys.Lett. B771 (2017) 52-58 | 10.1016/j.physletb.2017.05.014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a generalization of the AdS charged rotating black holes with
two equal magnitude angular momenta in five-dimensional minimal gauged
supergravity. In addition to the mass, electric charge and angular momentum,
the new solutions possess an extra-parameter associated with a non-zero
magnitude of the magnet... | [
{
"created": "Sun, 12 Mar 2017 19:23:25 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 2017 12:02:50 GMT",
"version": "v2"
}
] | 2017-05-31 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Navarro-Lérida",
"Francisco",
""
],
[
"Radu",
"Eugen",
""
]
] | We construct a generalization of the AdS charged rotating black holes with two equal magnitude angular momenta in five-dimensional minimal gauged supergravity. In addition to the mass, electric charge and angular momentum, the new solutions possess an extra-parameter associated with a non-zero magnitude of the magnetic... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.