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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1508.04697 | Mohammad Malekjani | Mohammad Malekjani, Tayebe Naderi and Francesco Pace | Effects of ghost dark energy perturbations on the evolution of spherical
overdensities | Accepted for publication in MNRAS | MNRAS 453, 4148 (2015) | 10.1093/mnras/stv1909 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While in the standard cosmological model the accelerated expansion of the
Universe is explained by invoking the presence of the cosmological constant
term, it is still unclear the true origin of this stunning observational fact.
It is therefore interesting to explore alternatives to the simplest scenario,
in particul... | [
{
"created": "Tue, 18 Aug 2015 10:54:08 GMT",
"version": "v1"
}
] | 2015-10-07 | [
[
"Malekjani",
"Mohammad",
""
],
[
"Naderi",
"Tayebe",
""
],
[
"Pace",
"Francesco",
""
]
] | While in the standard cosmological model the accelerated expansion of the Universe is explained by invoking the presence of the cosmological constant term, it is still unclear the true origin of this stunning observational fact. It is therefore interesting to explore alternatives to the simplest scenario, in particular... |
1910.11970 | Daniel Berkowitz | Daniel Berkowitz | New Solutions To The Bianchi IX Wheeler DeWitt Equation And Leading
Order Solutions For $\Lambda$ $\ne$ 0 And A Primordial Magnetic Field | null | null | null | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New closed form solutions to the Lorentzian signature symmetry reduced
Bianchi IX Wheeler DeWitt equation are obtained using a Euclidean-signature
semi classical method for Hartle Hawking ordering parameters $ \pm 2\sqrt{33} $
for the wormhole Hamilton-Jacobi solution. Moving past the wormhole case we
also compute fi... | [
{
"created": "Sat, 26 Oct 2019 00:50:00 GMT",
"version": "v1"
}
] | 2019-10-29 | [
[
"Berkowitz",
"Daniel",
""
]
] | New closed form solutions to the Lorentzian signature symmetry reduced Bianchi IX Wheeler DeWitt equation are obtained using a Euclidean-signature semi classical method for Hartle Hawking ordering parameters $ \pm 2\sqrt{33} $ for the wormhole Hamilton-Jacobi solution. Moving past the wormhole case we also compute firs... |
1707.06747 | Chikun Ding | Chikun Ding | Quasinormal ringing of black holes in Einstein aether theory | 9 firgures, 4tables, 4 pages and 2 appendix added. Accepted for
publication in Phys. Rev. D. arXiv admin note: text overlap with
arXiv:gr-qc/0701089 by other authors | Phys. Rev. D 96, 104021 (2017) | 10.1103/PhysRevD.96.104021 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational consequence of local Lorentz violation (LV) should show
itself in derivation of the characteristic quasinormal ringing of black hole
mergers from their general relativity case. In this paper, we study quasinormal
modes (QNMs) of the scalar and electromagnetic field perturbations to Einstein
aether b... | [
{
"created": "Fri, 21 Jul 2017 03:24:01 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2017 00:23:12 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Ding",
"Chikun",
""
]
] | The gravitational consequence of local Lorentz violation (LV) should show itself in derivation of the characteristic quasinormal ringing of black hole mergers from their general relativity case. In this paper, we study quasinormal modes (QNMs) of the scalar and electromagnetic field perturbations to Einstein aether bla... |
2211.13616 | Josef Seitz | Josef Seitz (Arnold-Sommerfeld-Center, Munich, Germany) | De Sitter and Minkowski Solutions in 4+1 Brane-World Models | 6 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We comment on approaches to the Cosmological Constant Problem in 4+1
dimensions, with the Standard Model fields confined to a 3-brane. We show that
requiring maximal 4D symmetry only on this 3-brane (and not on all other
3-branes that foliate the 4+1-dimensional space) leads to a wide class of de
Sitter solutions on ... | [
{
"created": "Thu, 24 Nov 2022 14:06:19 GMT",
"version": "v1"
}
] | 2022-11-28 | [
[
"Seitz",
"Josef",
"",
"Arnold-Sommerfeld-Center, Munich, Germany"
]
] | We comment on approaches to the Cosmological Constant Problem in 4+1 dimensions, with the Standard Model fields confined to a 3-brane. We show that requiring maximal 4D symmetry only on this 3-brane (and not on all other 3-branes that foliate the 4+1-dimensional space) leads to a wide class of de Sitter solutions on th... |
gr-qc/0111061 | Navin Singh | S.C. Tiwari | Time and Cosmic Clock | Prepared for Gravity Research Foundation Award 2001. Report
IONP-5-2001 | null | null | null | gr-qc | null | The nature of time vis-a-vis relativity is critically examined. Based on the
author's space-time interaction hypothesis of late 1970's, cosmological model
with time-varying velocity of light is discussed.
| [
{
"created": "Tue, 20 Nov 2001 08:00:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tiwari",
"S. C.",
""
]
] | The nature of time vis-a-vis relativity is critically examined. Based on the author's space-time interaction hypothesis of late 1970's, cosmological model with time-varying velocity of light is discussed. |
2101.07566 | David Benisty | David Benisty, David Vasak, Johannes Kirsch, Jurgen Struckmeier | Low-Redshift Constraints on Covariant Canonical Gauge Theory of Gravity | 9 pages; 5 figures | Eur. Phys. J. C81 (2021) 125 | 10.1140/epjc/s10052-021-08924-0 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Constraints on the Covariant Canonical Gauge Gravity (CCGG) theory from
low-redshift cosmology are studied. The formulation extends Einstein's theory
of General Relativity (GR) by a quadratic Riemann-Cartan term in the
Lagrangian, controlled by a "deformation" parameter. In the Friedman universe
this leads to an addi... | [
{
"created": "Tue, 19 Jan 2021 11:21:14 GMT",
"version": "v1"
}
] | 2021-02-09 | [
[
"Benisty",
"David",
""
],
[
"Vasak",
"David",
""
],
[
"Kirsch",
"Johannes",
""
],
[
"Struckmeier",
"Jurgen",
""
]
] | Constraints on the Covariant Canonical Gauge Gravity (CCGG) theory from low-redshift cosmology are studied. The formulation extends Einstein's theory of General Relativity (GR) by a quadratic Riemann-Cartan term in the Lagrangian, controlled by a "deformation" parameter. In the Friedman universe this leads to an additi... |
1110.3020 | Francesca Vidotto | Enrique F. Borja, I\~naki Garay, Francesca Vidotto | Learning about Quantum Gravity with a Couple of Nodes | null | SIGMA 8 (2012), 015, 44 pages | 10.3842/SIGMA.2012.015 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Loop Quantum Gravity provides a natural truncation of the infinite degrees of
freedom of gravity, obtained by studying the theory on a given finite graph. We
review this procedure and we present the construction of the canonical theory
on a simple graph, formed by only two nodes. We review the U(N) framework,
which p... | [
{
"created": "Thu, 13 Oct 2011 18:11:35 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2012 13:56:10 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Mar 2012 10:10:56 GMT",
"version": "v3"
},
{
"created": "Sun, 25 Mar 2012 07:26:43 GMT",
"version": "v4"
}
] | 2012-03-27 | [
[
"Borja",
"Enrique F.",
""
],
[
"Garay",
"Iñaki",
""
],
[
"Vidotto",
"Francesca",
""
]
] | Loop Quantum Gravity provides a natural truncation of the infinite degrees of freedom of gravity, obtained by studying the theory on a given finite graph. We review this procedure and we present the construction of the canonical theory on a simple graph, formed by only two nodes. We review the U(N) framework, which pro... |
1410.8281 | Supriya Pan | Supriya Pan and Subenoy Chakraborty | A cosmographic analysis of holographic dark energy models | 13 pages, 20 figures | Int. J. Mod. Phys. D Vol. 23, No. 11 (2014) 1450092 | 10.1142/S0218271814500928 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work deals with a detailed study of interacting holographic dark
energy model for three common choices of the interaction term. Also, two
standard choices of IR cut-off, namely, Ricci length scale and radius of the
event horizon are considered here. Finally, the cosmographic parameters are
presented both ... | [
{
"created": "Thu, 30 Oct 2014 07:51:23 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2014 08:06:08 GMT",
"version": "v2"
}
] | 2014-11-11 | [
[
"Pan",
"Supriya",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The present work deals with a detailed study of interacting holographic dark energy model for three common choices of the interaction term. Also, two standard choices of IR cut-off, namely, Ricci length scale and radius of the event horizon are considered here. Finally, the cosmographic parameters are presented both an... |
2404.07244 | V. G. Gurzadyan | M. Samsonyan, A.A. Kocharyan, V.G. Gurzadyan | Smearing of primordial gravitational waves | 8 pages, 4 figs; Eur Phys J Plus (in press) | Eur. Phys. J. Plus, 139, 317 (2024) | 10.1140/epjp/s13360-024-05097-z | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A mechanism for smearing of the primordial gravitational waves during the
radiation-dominated phase of the evolution of the Universe is considered. It is
shown that the primordial gravitational waves can possess hyperbolicity
features due to their propagation through the matter inhomogeneities. This
mechanism of smea... | [
{
"created": "Wed, 10 Apr 2024 02:51:01 GMT",
"version": "v1"
}
] | 2024-04-15 | [
[
"Samsonyan",
"M.",
""
],
[
"Kocharyan",
"A. A.",
""
],
[
"Gurzadyan",
"V. G.",
""
]
] | A mechanism for smearing of the primordial gravitational waves during the radiation-dominated phase of the evolution of the Universe is considered. It is shown that the primordial gravitational waves can possess hyperbolicity features due to their propagation through the matter inhomogeneities. This mechanism of smeari... |
1603.09671 | Parampreet Singh | David Craig, Parampreet Singh | The Vertex Expansion in the Consistent Histories Formulation of Spin
Foam Loop Quantum Cosmology | 6 pages. To appear in Proceedings of the Fourteenth Marcel Grossman
Meeting on General Relativity | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assignment of consistent quantum probabilities to events in a quantum
universe is a fundamental challenge which every quantum cosmology/gravity
framework must overcome. In loop quantum cosmology, this issue leads to a
fundamental question: What is the probability that the universe undergoes a
non-singular bounce? Usi... | [
{
"created": "Thu, 31 Mar 2016 16:31:30 GMT",
"version": "v1"
}
] | 2016-04-01 | [
[
"Craig",
"David",
""
],
[
"Singh",
"Parampreet",
""
]
] | Assignment of consistent quantum probabilities to events in a quantum universe is a fundamental challenge which every quantum cosmology/gravity framework must overcome. In loop quantum cosmology, this issue leads to a fundamental question: What is the probability that the universe undergoes a non-singular bounce? Using... |
0909.2330 | Laura Mersini-Houghton | L.Mersini-Houghton | Notes on Time's Enigma | 6pgs, Talk given at FQXI conference, Azores, 2009; to appear in
'Time's Arrow' book, Springer | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scientists continue to wrestle with the enigma of time. Is time a dynamic or
a fundamental property of spacetime? Why does it have an arrow pointing from
past to future? Why are physical laws time-symmetric in a universe with broken
time-reversal symmetry? These questions remain a mystery. The hope has been
that an u... | [
{
"created": "Sat, 12 Sep 2009 12:59:51 GMT",
"version": "v1"
}
] | 2009-09-15 | [
[
"Mersini-Houghton",
"L.",
""
]
] | Scientists continue to wrestle with the enigma of time. Is time a dynamic or a fundamental property of spacetime? Why does it have an arrow pointing from past to future? Why are physical laws time-symmetric in a universe with broken time-reversal symmetry? These questions remain a mystery. The hope has been that an und... |
gr-qc/0309085 | Stephane Fay | Stephane Fay | Hamiltonian study of the Generalized scalar-tensor theory with potential
in a Bianchi type I model | 15 pages | Class.Quant.Grav. 17 (2000) 891-902 | 10.1088/0264-9381/17/4/310 | null | gr-qc | null | We study the generalized scalar tensor theory with a potential in the Bianchi
type I model by using the ADM formalism. We examine the conditions for the
Universe to be in expansion, isotropic and with a positive potential at late
time in the Brans-Dicke and Einstein frames. In particular, we analyse the two
important... | [
{
"created": "Thu, 18 Sep 2003 11:35:43 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Fay",
"Stephane",
""
]
] | We study the generalized scalar tensor theory with a potential in the Bianchi type I model by using the ADM formalism. We examine the conditions for the Universe to be in expansion, isotropic and with a positive potential at late time in the Brans-Dicke and Einstein frames. In particular, we analyse the two important c... |
gr-qc/0302036 | Gaetano Vilasi | F. Canfora, G. Vilasi | Trace anomaly and black holes evaporation | null | null | null | null | gr-qc hep-th | null | A model is proposed to describe a transition from a Schwarzschild black hole
of mass $M_{0}$ to a Schwarzschild black hole of mass $M_{1}$ $\leq M_{0}$. The
basic equations are derived from the non-vacuum Einstein field equations taking
a source representing a null scalar field with a nonvanishing trace anomaly. It
i... | [
{
"created": "Mon, 10 Feb 2003 21:53:56 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 2003 22:04:35 GMT",
"version": "v2"
},
{
"created": "Mon, 5 May 2003 17:17:25 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Canfora",
"F.",
""
],
[
"Vilasi",
"G.",
""
]
] | A model is proposed to describe a transition from a Schwarzschild black hole of mass $M_{0}$ to a Schwarzschild black hole of mass $M_{1}$ $\leq M_{0}$. The basic equations are derived from the non-vacuum Einstein field equations taking a source representing a null scalar field with a nonvanishing trace anomaly. It is ... |
0904.0066 | D. V. Ahluwalia | D. V. Ahluwalia | Towards a relativity of dark-matter rods and clocks | Revised version with minor changes. This essay received an "honorable
mention" in the 2009 Essay Competition of the Gravity Research Foundation.
Submitted to IJMPD Special Issue | Int. J. Mod. Phys. D18:2311-2316, 2009 | 10.1142/S0218271809015850 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the absence of dark matter, the dynamical and kinematical interpretations
of the special relativistic spacetime have been and still are the topic of
philosophic debate, which whilst fertile, is by and large of little predictive
power. This changes dramatically if the debate includes a dark matter candidate
in a "n... | [
{
"created": "Wed, 1 Apr 2009 18:59:04 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2009 03:27:56 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Oct 2009 06:16:07 GMT",
"version": "v3"
}
] | 2011-06-16 | [
[
"Ahluwalia",
"D. V.",
""
]
] | In the absence of dark matter, the dynamical and kinematical interpretations of the special relativistic spacetime have been and still are the topic of philosophic debate, which whilst fertile, is by and large of little predictive power. This changes dramatically if the debate includes a dark matter candidate in a "non... |
2309.14472 | Christopher Alexander | Christopher Alexander, Blake Temple and Joel Smoller | Shock-Wave Refinement of the Friedmann-Robertson-Walker Metric | null | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | The mathematics of general relativistic shock waves is introduced and
considered in a cosmological context. In particular, an expanding
Friedmann-Roberson-Walker metric is matched to a Tolman-Oppenheimer-Volkoff
metric across a spherical shock surface. This is the general relativistic
analogue of a shock-wave explosi... | [
{
"created": "Mon, 25 Sep 2023 19:14:13 GMT",
"version": "v1"
}
] | 2023-09-27 | [
[
"Alexander",
"Christopher",
""
],
[
"Temple",
"Blake",
""
],
[
"Smoller",
"Joel",
""
]
] | The mathematics of general relativistic shock waves is introduced and considered in a cosmological context. In particular, an expanding Friedmann-Roberson-Walker metric is matched to a Tolman-Oppenheimer-Volkoff metric across a spherical shock surface. This is the general relativistic analogue of a shock-wave explosion... |
0903.4144 | Gilberto Medeiros Kremer | Luis P. Chimento, Monica Forte, Gilberto M. Kremer, Martin G. Richarte | Tachyon and Quintessence Brane-World Universe | 8 pages. Version accepted for publication in Physical Review D | Phys.Rev.D79:083527,2009 | 10.1103/PhysRevD.79.083527 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using tachyon or quintessence fields along with a barotropic fluid on the
brane we examine the different cosmological stages in a
Friedmann-Robertson-Walker(FRW) universe, from the first radiation scenario to
the later era dominated by cosmic string networks. We introduce a new algorithm
to generalize previous works ... | [
{
"created": "Tue, 24 Mar 2009 17:49:18 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 2009 07:08:26 GMT",
"version": "v2"
}
] | 2011-08-11 | [
[
"Chimento",
"Luis P.",
""
],
[
"Forte",
"Monica",
""
],
[
"Kremer",
"Gilberto M.",
""
],
[
"Richarte",
"Martin G.",
""
]
] | Using tachyon or quintessence fields along with a barotropic fluid on the brane we examine the different cosmological stages in a Friedmann-Robertson-Walker(FRW) universe, from the first radiation scenario to the later era dominated by cosmic string networks. We introduce a new algorithm to generalize previous works on... |
0711.4415 | J. Ponce de Leon | J. Ponce de Leon | Static exteriors for nonstatic braneworld stars | Some Editorial changes and references added to the boundary
conditions section. Accepted for publication in Classical and Quantum Gravity | Class.Quant.Grav.25:075012,2008 | 10.1088/0264-9381/25/7/075012 | null | gr-qc | null | We study possible static non-Schwarzschild exteriors for nonstatic
spherically symmetric stars in a Randall $&$ Sundrum type II braneworld
scenario. Thus, the vacuum region outside the surface of a star is assumed to
be a static solution to the equation $^{(4)}R = 0$, where $^{(4)}R $ is the
scalar curvature of the 4... | [
{
"created": "Wed, 28 Nov 2007 03:49:08 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2008 05:24:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"de Leon",
"J. Ponce",
""
]
] | We study possible static non-Schwarzschild exteriors for nonstatic spherically symmetric stars in a Randall $&$ Sundrum type II braneworld scenario. Thus, the vacuum region outside the surface of a star is assumed to be a static solution to the equation $^{(4)}R = 0$, where $^{(4)}R $ is the scalar curvature of the 4-d... |
1807.00434 | Federico Di Gioia | Federico Di Gioia and Giovanni Montani | Linear perturbations of an anisotropic Bianchi I model with a uniform
magnetic field | Small modifications. Final version, published by EPJC | Eur. Phys. J. C (2019) 79: 921 | 10.1140/epjc/s10052-019-7411-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the effect of a magnetic field on the growth of
cosmological perturbations. We develop a mathematical consistent treatment in
which a perfect fluid and a uniform magnetic field evolve together in a Bianchi
I universe. We then study the energy density perturbations on this background
with partic... | [
{
"created": "Mon, 2 Jul 2018 02:11:12 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2018 12:30:48 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jun 2019 15:35:54 GMT",
"version": "v3"
},
{
"created": "Sun, 17 Nov 2019 15:16:36 GMT",
"version": "v4"
}
] | 2019-11-19 | [
[
"Di Gioia",
"Federico",
""
],
[
"Montani",
"Giovanni",
""
]
] | In this work, we study the effect of a magnetic field on the growth of cosmological perturbations. We develop a mathematical consistent treatment in which a perfect fluid and a uniform magnetic field evolve together in a Bianchi I universe. We then study the energy density perturbations on this background with particul... |
2211.13477 | Ken-Ichi Nakao | Ken-ichi Nakao, Kazumasa Okabayashi and Tomohiro Harada | Radiative gravastar with thermal spectrum; Sudden vacuum condensation
without gravitational collapse | 22 pages, 2 figures. arXiv admin note: text overlap with
arXiv:2203.14519. Discussions about the temperature of the radiation are
added in the revised version | null | 10.1103/PhysRevD.107.084036 | AP-GR-186, NITEP 150, YITP-22-141, RUP-22-24 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The gravastar is an exotic compact object proposed as a final product of
gravitational collapse of a massive object in order to resolve problems
associated with black holes. It is enclosed by a thin crust and the inside of
it is occupied by the positive cosmological constant. Recently, the present
authors studied qua... | [
{
"created": "Thu, 24 Nov 2022 08:51:09 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2022 03:42:35 GMT",
"version": "v2"
}
] | 2023-05-03 | [
[
"Nakao",
"Ken-ichi",
""
],
[
"Okabayashi",
"Kazumasa",
""
],
[
"Harada",
"Tomohiro",
""
]
] | The gravastar is an exotic compact object proposed as a final product of gravitational collapse of a massive object in order to resolve problems associated with black holes. It is enclosed by a thin crust and the inside of it is occupied by the positive cosmological constant. Recently, the present authors studied quant... |
2407.01736 | Surajit Kalita | Surajit Kalita | Constraining Fundamental Constants with Fast Radio Bursts: Unveiling the
Role of Energy Scale | 7 pages with 3 figures and 1 table; accepted for publication in MNRAS
Letters | MNRAS: Letters 533 (2024) L57 | 10.1093/mnrasl/slae062 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding physical mechanisms relies on the accurate determination of
fundamental constants, although inherent limitations in experimental techniques
introduce uncertainties into these measurements. This paper explores the
uncertainties associated with measuring the fine-structure constant ($\alpha$)
and the prot... | [
{
"created": "Mon, 1 Jul 2024 19:11:28 GMT",
"version": "v1"
}
] | 2024-07-11 | [
[
"Kalita",
"Surajit",
""
]
] | Understanding physical mechanisms relies on the accurate determination of fundamental constants, although inherent limitations in experimental techniques introduce uncertainties into these measurements. This paper explores the uncertainties associated with measuring the fine-structure constant ($\alpha$) and the proton... |
2105.13529 | Abhik Kumar Sanyal Dr. | Abhik Kumar Sanyal, Bijan Modak and Manas Chakrabortty | New conserved tensors and Brans-Dicke type field equation, using
integrability condition | 14 pages, 0 figures | International Journal of Geometric Methods in Modern Physics,
(2022) 2250058 (19 pages) | 10.1142/S021988782250058X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore some new off-shell and on-shell conserved quantities for a scalar
field in Minkowski space, using integrability condition. The off-shell
conserved tensors are related to the kinematics of the field, while a linear
combination of the off-shell and the on-shell conserved tensors ends up with
the energy-momen... | [
{
"created": "Fri, 28 May 2021 01:05:07 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2022 15:05:34 GMT",
"version": "v2"
}
] | 2022-01-21 | [
[
"Sanyal",
"Abhik Kumar",
""
],
[
"Modak",
"Bijan",
""
],
[
"Chakrabortty",
"Manas",
""
]
] | We explore some new off-shell and on-shell conserved quantities for a scalar field in Minkowski space, using integrability condition. The off-shell conserved tensors are related to the kinematics of the field, while a linear combination of the off-shell and the on-shell conserved tensors ends up with the energy-momentu... |
gr-qc/0403079 | Alexander I. Nesterov | Alexander I. Nesterov | Topology change in (2+1)-dimensional gravity with non-Abelian Higgs
field | This essay was selected for an Honorable Mention by the Gravity
Research Foundation, 1996 | Gen.Rel.Grav. 29 (1997) 1115-1122 | 10.1023/A:1018839108338 | null | gr-qc hep-th math-ph math.GT math.MP | null | We study topology change in (2+1)D gravity coupling with non-Abelian SO(2,1)
Higgs field from the point of view of Morse theory. It is shown that the Higgs
potential can be identified as a Morse function. The critical points of the
latter (i.e. loci of change of the spacetime topology) coincide with zeros of
the Higg... | [
{
"created": "Thu, 18 Mar 2004 03:15:04 GMT",
"version": "v1"
}
] | 2013-01-15 | [
[
"Nesterov",
"Alexander I.",
""
]
] | We study topology change in (2+1)D gravity coupling with non-Abelian SO(2,1) Higgs field from the point of view of Morse theory. It is shown that the Higgs potential can be identified as a Morse function. The critical points of the latter (i.e. loci of change of the spacetime topology) coincide with zeros of the Higgs ... |
1909.07959 | Raihaneh Moti | R. Moti and A. Shojai | Geodesic congruences in quantum improved spacetimes | null | Phys. Rev. D 101, 064013 (2020) | 10.1103/PhysRevD.101.064013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the geodesic deviation equation in the context of quantum
improved spacetimes. The improved Raychaudhuri equation is derived, and it is
shown that the classical strong energy condition does not necessarily lead to
the convergence of geodesics in a congruence in the quantum improved spacetime.
| [
{
"created": "Tue, 17 Sep 2019 17:50:16 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Nov 2019 13:49:41 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Feb 2020 16:59:26 GMT",
"version": "v3"
}
] | 2020-03-11 | [
[
"Moti",
"R.",
""
],
[
"Shojai",
"A.",
""
]
] | We investigate the geodesic deviation equation in the context of quantum improved spacetimes. The improved Raychaudhuri equation is derived, and it is shown that the classical strong energy condition does not necessarily lead to the convergence of geodesics in a congruence in the quantum improved spacetime. |
2012.04997 | Nikolay Fimin N | N.N. Fimin, V.M. Chechetkin | The modified Newton attraction law and its connection with cosmological
$\Lambda$--term | null | null | 10.1140/epjp/s13360-020-01002-6 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility of generalizing the Newtonian law of gravity and
the transition to a general relativistic model for weak fields with the
inclusion of a repulsive term identified as a cosmological constant. The
analysis includes that of the test particle's motion in a modified
gravitational field of the Hi... | [
{
"created": "Wed, 9 Dec 2020 12:04:12 GMT",
"version": "v1"
}
] | 2020-12-10 | [
[
"Fimin",
"N. N.",
""
],
[
"Chechetkin",
"V. M.",
""
]
] | We consider the possibility of generalizing the Newtonian law of gravity and the transition to a general relativistic model for weak fields with the inclusion of a repulsive term identified as a cosmological constant. The analysis includes that of the test particle's motion in a modified gravitational field of the Hilb... |
1606.06967 | Nicholas Tsamis | N. C. Tsamis and R. P. Woodard | An Improved Cosmological Model | 22 pages, 9 figures, uses latex 2e | Phys. Rev. D 94, 043508 (2016) | 10.1103/PhysRevD.94.043508 | UFIFT-QG-16-07, CCTP-2016-09, CCQCN-2016-146, ITCP-IPP 2016/07 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a class of non-local, action-based, and purely gravitational models.
These models seek to describe a cosmology in which inflation is driven by a
large, bare cosmological constant that is screened by the self-gravitation
between the soft gravitons that inflation rips from the vacuum. Inflation ends
with the u... | [
{
"created": "Wed, 22 Jun 2016 14:47:56 GMT",
"version": "v1"
}
] | 2016-08-17 | [
[
"Tsamis",
"N. C.",
""
],
[
"Woodard",
"R. P.",
""
]
] | We study a class of non-local, action-based, and purely gravitational models. These models seek to describe a cosmology in which inflation is driven by a large, bare cosmological constant that is screened by the self-gravitation between the soft gravitons that inflation rips from the vacuum. Inflation ends with the uni... |
2107.02872 | Yaghoub Heydarzade | Elham Ghorani and Yaghoub Heydarzade | On the initial singularity in Kantowski-Sachs spacetime | 21 pages, 4 figures, published version | Eur. Phys. J. C 81, 557 (2021) | 10.1140/epjc/s10052-021-09355-7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The emergent universe scenario is a proposal for resolving the Big Bang
singularity problem in the standard Friedmann-Lemaitre-Robertson-Walker
cosmology. In the context of this scenario, the Universe originates from a
nonsingular static state. In the present work, considering the realization of
the emergent universe... | [
{
"created": "Tue, 6 Jul 2021 20:11:50 GMT",
"version": "v1"
}
] | 2021-07-14 | [
[
"Ghorani",
"Elham",
""
],
[
"Heydarzade",
"Yaghoub",
""
]
] | The emergent universe scenario is a proposal for resolving the Big Bang singularity problem in the standard Friedmann-Lemaitre-Robertson-Walker cosmology. In the context of this scenario, the Universe originates from a nonsingular static state. In the present work, considering the realization of the emergent universe s... |
0811.3582 | Joseph Romano | Lee Samuel Finn, Shane L. Larson, Joseph D. Romano | Detecting a Stochastic Gravitational-Wave Background: The Overlap
Reduction Function | Removed incorrect references to the Seto and Taruya papers; added
explicit expression for the detector transfer function; final published
version | Phys.Rev.D79:062003,2009 | 10.1103/PhysRevD.79.062003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detection of a gravitational-wave stochastic background via ground or
space-based gravitational-wave detectors requires the cross-correlation of the
response of two or more independent detectors. The cross-correlation involves a
frequency-dependent factor -- the so-called overlap reduction function or
Hellings-Downs ... | [
{
"created": "Fri, 21 Nov 2008 17:03:03 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2009 15:25:51 GMT",
"version": "v2"
}
] | 2009-11-06 | [
[
"Finn",
"Lee Samuel",
""
],
[
"Larson",
"Shane L.",
""
],
[
"Romano",
"Joseph D.",
""
]
] | Detection of a gravitational-wave stochastic background via ground or space-based gravitational-wave detectors requires the cross-correlation of the response of two or more independent detectors. The cross-correlation involves a frequency-dependent factor -- the so-called overlap reduction function or Hellings-Downs cu... |
2111.01283 | Andrea Geralico | Donato Bini, Andrea Geralico, Robert T. Jantzen | Petrov type I spacetime curvature: principal null vector spanning
dimension | v1: 16 pages; v2: 21 pages, references added, discussion expanded;
v3: 21 pages, final version matching the published one | International Journal of Geometric Methods in Modern Physics
(2023) 2350087 | 10.1142/S0219887823500871 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The class of Petrov type I curvature tensors is further divided into those
for which the span of the set of distinct principal null directions has
dimension four (maximally spanning type I) or dimension three (nonmaximally
spanning type I). Explicit examples are provided for both vacuum and nonvacuum
spacetimes.
| [
{
"created": "Mon, 1 Nov 2021 22:26:54 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Mar 2022 22:04:26 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Feb 2023 10:06:49 GMT",
"version": "v3"
}
] | 2023-02-08 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Jantzen",
"Robert T.",
""
]
] | The class of Petrov type I curvature tensors is further divided into those for which the span of the set of distinct principal null directions has dimension four (maximally spanning type I) or dimension three (nonmaximally spanning type I). Explicit examples are provided for both vacuum and nonvacuum spacetimes. |
2312.13659 | Jia-Hui Huang | Jia-Hui Huang | No black hole bomb for $D$-dimensional non-extremal Reissner-Nordstrom
black holes against charged massive scalar perturbation | 34 pages,no figure. arXiv admin note: text overlap with
arXiv:2201.00725 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The superradiant stability of asymptotically flat $D$-dimensional
non-extremal Reissner-Nordstrom black holes under charged massive scalar
perturbation is analytically studied. In previous works, it proved that there
are no black hole bombs for five and six-dimensional non-extremal
Reissner-Nordstrom black holes agai... | [
{
"created": "Thu, 21 Dec 2023 08:31:57 GMT",
"version": "v1"
}
] | 2023-12-22 | [
[
"Huang",
"Jia-Hui",
""
]
] | The superradiant stability of asymptotically flat $D$-dimensional non-extremal Reissner-Nordstrom black holes under charged massive scalar perturbation is analytically studied. In previous works, it proved that there are no black hole bombs for five and six-dimensional non-extremal Reissner-Nordstrom black holes agains... |
gr-qc/0604063 | Timothy Clifton | John D. Barrow and T. Clifton | Cosmologies with Energy Exchange | 12 pages, 1 figure | Phys.Rev.D73:103520,2006 | 10.1103/PhysRevD.73.103520 | null | gr-qc astro-ph | null | We provide a simple mathematical description of the exchange of energy
between two fluids in an expanding Friedmann universe with zero spatial
curvature. The evolution can be reduced to a single non-linear differential
equation which we solve in physically relevant cases and provide an analysis of
all the possible ev... | [
{
"created": "Mon, 17 Apr 2006 13:32:55 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2006 17:14:32 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barrow",
"John D.",
""
],
[
"Clifton",
"T.",
""
]
] | We provide a simple mathematical description of the exchange of energy between two fluids in an expanding Friedmann universe with zero spatial curvature. The evolution can be reduced to a single non-linear differential equation which we solve in physically relevant cases and provide an analysis of all the possible evol... |
1909.12344 | Mahdi Kord Zangeneh | S. Rajaee Chaloshtary, M. Kord Zangeneh, S. Hajkhalili, A. Sheykhi, S.
M. Zebarjad | Thermodynamics and reentrant phase transition for logarithmic nonlinear
charged black holes in massive gravity | 14 pages (one column), 12 captioned figures | 2020 | 10.1142/S0218271820500819 | International Journal of Modern Physics, 29, No. 12, 2050081 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a new class of $(n+1)$-dimensional topological black hole
solutions in the context of massive gravity and in the presence of logarithmic
nonlinear electrodynamics. Exploring higher dimensional solutions in massive
gravity coupled to nonlinear electrodynamics is motivated by holographic
hypothesis as we... | [
{
"created": "Thu, 26 Sep 2019 19:15:31 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Feb 2020 22:24:58 GMT",
"version": "v2"
}
] | 2023-10-31 | [
[
"Chaloshtary",
"S. Rajaee",
""
],
[
"Zangeneh",
"M. Kord",
""
],
[
"Hajkhalili",
"S.",
""
],
[
"Sheykhi",
"A.",
""
],
[
"Zebarjad",
"S. M.",
""
]
] | We investigate a new class of $(n+1)$-dimensional topological black hole solutions in the context of massive gravity and in the presence of logarithmic nonlinear electrodynamics. Exploring higher dimensional solutions in massive gravity coupled to nonlinear electrodynamics is motivated by holographic hypothesis as well... |
1806.09845 | Ashutosh Tripathi | Ashutosh Tripathi | Testing General Relativity with X-ray Reflection Spectroscopy of a
'Bare' Active Galactic Nucleus | 6 pages, 2 figures, conference | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein's gravity has been extensively tested in the weak field regime,
primarily with experiments in the Solar System and observations of binary
pulsars, and current data agree well with theoretical predictions. On the other
hand, strong gravity is largely unexplored and there are a number of theories
beyond Einste... | [
{
"created": "Tue, 26 Jun 2018 08:48:42 GMT",
"version": "v1"
}
] | 2018-06-27 | [
[
"Tripathi",
"Ashutosh",
""
]
] | Einstein's gravity has been extensively tested in the weak field regime, primarily with experiments in the Solar System and observations of binary pulsars, and current data agree well with theoretical predictions. On the other hand, strong gravity is largely unexplored and there are a number of theories beyond Einstein... |
1604.02955 | Georgios Lukes Gerakopoulos | Georgios Lukes-Gerakopoulos | Comment on "Chaotic orbits for spinning particles in Schwarzschild
spacetime" | 3 pages, a comment on the article: C. Verhaaren and E. W. Hirschmann,
Chaotic orbits for spinning particles in Schwarzschild spacetime, Phys. Rev.
D 81, 124034 (2010) | Phys. Rev. D 94, 108501 (2016) | 10.1103/PhysRevD.94.108501 | null | gr-qc nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The astrophysical relevance of chaos for a test particle with spin moving in
Schwarzschild spacetime was the objective of \cite{Verhaaren10}. Even if the
results of the study seem to be qualitatively in agreement with similar works,
the study presented in \cite{Verhaaren10} suffers both from theoretical and
technical... | [
{
"created": "Mon, 11 Apr 2016 13:52:30 GMT",
"version": "v1"
}
] | 2016-11-16 | [
[
"Lukes-Gerakopoulos",
"Georgios",
""
]
] | The astrophysical relevance of chaos for a test particle with spin moving in Schwarzschild spacetime was the objective of \cite{Verhaaren10}. Even if the results of the study seem to be qualitatively in agreement with similar works, the study presented in \cite{Verhaaren10} suffers both from theoretical and technical i... |
2103.14674 | Maciej Kolanowski | Maciej Kolanowski and Jerzy Lewandowski | Hamiltonian charges in the asymptotically de Sitter spacetimes | 18 pages, 1 figure | null | 10.1007/JHEP05(2021)063 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize a notion of 'conserved' charges given by Wald and Zoupas to the
asymptotically de Sitter spacetimes. Surprisingly, our construction is less
ambiguous than the one encountered in the asymptotically flat context. An
expansion around exact solutions possessing Killing vectors provides their
physical meanin... | [
{
"created": "Fri, 26 Mar 2021 18:23:12 GMT",
"version": "v1"
}
] | 2021-05-26 | [
[
"Kolanowski",
"Maciej",
""
],
[
"Lewandowski",
"Jerzy",
""
]
] | We generalize a notion of 'conserved' charges given by Wald and Zoupas to the asymptotically de Sitter spacetimes. Surprisingly, our construction is less ambiguous than the one encountered in the asymptotically flat context. An expansion around exact solutions possessing Killing vectors provides their physical meaning.... |
2304.09332 | Jaroslaw Jaracz | Jaroslaw S. Jaracz | Nonexistence of Solutions to the Coupled Generalized Jang Equation/Zero
Divergence System | null | null | 10.13140/RG.2.2.20090.77768 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In [5], Bray and Khuri proposed coupling the generalized Jang equation to
several different auxiliary equations. The solutions to these coupled systems
would then imply the Penrose inequality. One of these involves coupling the
generalized Jang equation to $\overline{div}(\phi q)=0$, as this would
guarantee the non-n... | [
{
"created": "Tue, 18 Apr 2023 22:39:33 GMT",
"version": "v1"
}
] | 2023-04-20 | [
[
"Jaracz",
"Jaroslaw S.",
""
]
] | In [5], Bray and Khuri proposed coupling the generalized Jang equation to several different auxiliary equations. The solutions to these coupled systems would then imply the Penrose inequality. One of these involves coupling the generalized Jang equation to $\overline{div}(\phi q)=0$, as this would guarantee the non-neg... |
1207.5060 | Paolo Aschieri | Paolo Aschieri | Extended gravity from noncommutativity | 13 pages. Proceedings of the "Twelfth international Symposium
Frontiers of fundamental Physics FFP12", Udine 21-23.11.11 | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the first order theory of gravity (vierbein formulation) on
noncommutative spacetime studied in [1, 2]. The first order formalism allows to
couple the theory to fermions. This NC action is then reinterpreted (using the
Seiberg-Witten map) as a gravity theory on commutative spacetime that contains
terms with... | [
{
"created": "Fri, 20 Jul 2012 21:10:31 GMT",
"version": "v1"
}
] | 2012-07-24 | [
[
"Aschieri",
"Paolo",
""
]
] | We review the first order theory of gravity (vierbein formulation) on noncommutative spacetime studied in [1, 2]. The first order formalism allows to couple the theory to fermions. This NC action is then reinterpreted (using the Seiberg-Witten map) as a gravity theory on commutative spacetime that contains terms with h... |
1705.07102 | Nirmalya Kajuri | Nirmalya Kajuri | The time measurement problem in quantum cosmology | 5 pages. Received Honorable Mention in the 2017 Gravity Research
Foundation essay competition | Int. J. Mod. Phys. D, 26, 1743011 (2017) | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the canonical approach to quantization of gravity, one often uses
relational clock variables and an interpretation in terms of conditional
probabilities to overcome the problem of time. In this essay we show that these
suffer from serious conceptual issues.
| [
{
"created": "Fri, 19 May 2017 17:27:26 GMT",
"version": "v1"
}
] | 2017-11-23 | [
[
"Kajuri",
"Nirmalya",
""
]
] | In the canonical approach to quantization of gravity, one often uses relational clock variables and an interpretation in terms of conditional probabilities to overcome the problem of time. In this essay we show that these suffer from serious conceptual issues. |
2012.02343 | Jianbo Lu | Jianbo Lu, Jiachun Li, Hui Guo, Zhitong Zhuang, Xin Zhao | Linearized physics and gravitational-waves polarizations in the Palatini
formalism of GBD theory | 12 pages, no figure | Physics Letters B 811 (2020) 135985 | 10.1016/j.physletb.2020.135985 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | A generalized Brans-Dicke (GBD) theory in the framework of Palatini formalism
are proposed in this paper. We derive the field equations by using the
variational approach and obtain the linearized equations by using the
weak-field approximation method. We show various properties of the geometrical
scalar field in the ... | [
{
"created": "Fri, 4 Dec 2020 00:28:51 GMT",
"version": "v1"
}
] | 2020-12-30 | [
[
"Lu",
"Jianbo",
""
],
[
"Li",
"Jiachun",
""
],
[
"Guo",
"Hui",
""
],
[
"Zhuang",
"Zhitong",
""
],
[
"Zhao",
"Xin",
""
]
] | A generalized Brans-Dicke (GBD) theory in the framework of Palatini formalism are proposed in this paper. We derive the field equations by using the variational approach and obtain the linearized equations by using the weak-field approximation method. We show various properties of the geometrical scalar field in the Pa... |
2302.06864 | Yorgo Senikoglu | Yorgo Senikoglu | Scattering of complex gravitino test fields from a gravitational pulse | Accepted Version to appear in GERG | null | 10.1007/s10714-023-03089-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational pulse waves are defined as step functions at the boundaries. In
this setting, linearized Rarita-Schwinger equations are precisely solved in
Rosen coordinates. It is found that the gravitino's energy-momentum varies with
the sandwich wave's shape. The gravitino's energy density will decrease as it
crosse... | [
{
"created": "Tue, 14 Feb 2023 07:04:15 GMT",
"version": "v1"
}
] | 2023-03-15 | [
[
"Senikoglu",
"Yorgo",
""
]
] | Gravitational pulse waves are defined as step functions at the boundaries. In this setting, linearized Rarita-Schwinger equations are precisely solved in Rosen coordinates. It is found that the gravitino's energy-momentum varies with the sandwich wave's shape. The gravitino's energy density will decrease as it crosses ... |
1108.2916 | Hengzhong Fang | H. Z. Fang and K. H. Zhou | Phonon tunnels across a sonic horizon | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider phonon tunneling in sonic black hole by WKB approximation method
without the backreaction, in which the relativistic momentum-energy equation is
used. We also study the WKB loop (closed path) integral [B. D. Chowdhury,
Pramana70:3-26, 2008] in sonic black hole case and discuss the equivalence of
the resul... | [
{
"created": "Mon, 15 Aug 2011 01:51:20 GMT",
"version": "v1"
}
] | 2011-08-16 | [
[
"Fang",
"H. Z.",
""
],
[
"Zhou",
"K. H.",
""
]
] | We consider phonon tunneling in sonic black hole by WKB approximation method without the backreaction, in which the relativistic momentum-energy equation is used. We also study the WKB loop (closed path) integral [B. D. Chowdhury, Pramana70:3-26, 2008] in sonic black hole case and discuss the equivalence of the results... |
2209.02278 | Tianhao Wu | Tianhao Wu | AdS Wormholes from AdS/Ricci-flat Correspondence | Corrected some typos in the Appendix in previous version | null | 10.1103/PhysRevD.108.044001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Wormholes in general dimensions by studying the
Einstein-phantom scalar field with and without the cosmological constant.
Solving AdS wormholes in general dimension is hard due to the nonlinear nature
of the theory. In this work, we implement the AdS/Ricci-flat correspondence,
extended to include the a... | [
{
"created": "Tue, 6 Sep 2022 08:10:19 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Apr 2023 22:36:18 GMT",
"version": "v2"
}
] | 2023-08-16 | [
[
"Wu",
"Tianhao",
""
]
] | We discuss the Wormholes in general dimensions by studying the Einstein-phantom scalar field with and without the cosmological constant. Solving AdS wormholes in general dimension is hard due to the nonlinear nature of the theory. In this work, we implement the AdS/Ricci-flat correspondence, extended to include the axi... |
2104.09626 | Hermann Nicolai | Hermann Nicolai | Complexity and the Big Bang | Revised version: minor additions and clarifications; references added | null | 10.1088/1361-6382/ac1b07 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After a brief review of current scenarios for the resolution and/or avoidance
of the Big Bang, an alternative hypothesis is put forward implying an infinite
increase in complexity towards the initial singularity. This may result in an
effective non-calculability which would present an obstruction to actually
reaching... | [
{
"created": "Fri, 16 Apr 2021 08:26:53 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2021 11:13:45 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Aug 2021 09:52:31 GMT",
"version": "v3"
}
] | 2021-09-22 | [
[
"Nicolai",
"Hermann",
""
]
] | After a brief review of current scenarios for the resolution and/or avoidance of the Big Bang, an alternative hypothesis is put forward implying an infinite increase in complexity towards the initial singularity. This may result in an effective non-calculability which would present an obstruction to actually reaching t... |
2310.11990 | Vania Vellucci | Edgardo Franzin, Stefano Liberati, Vania Vellucci | From regular black holes to horizonless objects: quasi-normal modes,
instabilities and spectroscopy | null | JCAP01(2024)020 | 10.1088/1475-7516/2024/01/020 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational and test-field perturbations for the two possible
families of spherically symmetric black-hole mimickers that smoothly
interpolate between regular black holes and horizonless compact objects
accordingly to the value of a regularization parameter. One family can be
described by the Bardeen-like ... | [
{
"created": "Wed, 18 Oct 2023 14:21:03 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 2024 11:51:57 GMT",
"version": "v2"
}
] | 2024-03-08 | [
[
"Franzin",
"Edgardo",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Vellucci",
"Vania",
""
]
] | We study gravitational and test-field perturbations for the two possible families of spherically symmetric black-hole mimickers that smoothly interpolate between regular black holes and horizonless compact objects accordingly to the value of a regularization parameter. One family can be described by the Bardeen-like me... |
1409.1894 | Olga Kichakova | Olga Kichakova, Jutta Kunz, Eugen Radu, Yasha Shnir | Non-Abelian fields in AdS$_4$ spacetime: axially symmetric, composite
configurations | 30 pages, 15 figures | Phys. Rev. D 90, 124012 (2014) | 10.1103/PhysRevD.90.124012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct new finite energy regular solutions in Einstein-Yang-Mills-SU(2)
theory. They are static, axially symmetric and approach at infinity the anti-de
Sitter spacetime background. These configurations are characterized by a pair
of integers $(m, n)$, where $m$ is related to the polar angle and $n$ to the
azimu... | [
{
"created": "Fri, 5 Sep 2014 18:11:13 GMT",
"version": "v1"
}
] | 2014-12-17 | [
[
"Kichakova",
"Olga",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Radu",
"Eugen",
""
],
[
"Shnir",
"Yasha",
""
]
] | We construct new finite energy regular solutions in Einstein-Yang-Mills-SU(2) theory. They are static, axially symmetric and approach at infinity the anti-de Sitter spacetime background. These configurations are characterized by a pair of integers $(m, n)$, where $m$ is related to the polar angle and $n$ to the azimuth... |
1810.03942 | Rafael Nunes | Rafael C. Nunes, Supriya Pan, and Emmanuel N. Saridakis | New observational constraints on $f(T)$ gravity through
gravitational-wave astronomy | 8 pages, 5 figures, 1 table. Matches the version published in PRD | Phys. Rev. D 98, 104055 (2018) | 10.1103/PhysRevD.98.104055 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the new observational constraints on $f(T)$ gravity that arise
from the effects of primordial gravitational waves (GWs) on the cosmic
microwave background (CMB) anisotropies and the BB spectrum. We first show that
on the GWs propagation in $f(T)$ gravity we obtain only an amplitude
modification and not... | [
{
"created": "Tue, 9 Oct 2018 12:40:04 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Nov 2018 11:06:59 GMT",
"version": "v2"
}
] | 2018-11-30 | [
[
"Nunes",
"Rafael C.",
""
],
[
"Pan",
"Supriya",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the new observational constraints on $f(T)$ gravity that arise from the effects of primordial gravitational waves (GWs) on the cosmic microwave background (CMB) anisotropies and the BB spectrum. We first show that on the GWs propagation in $f(T)$ gravity we obtain only an amplitude modification and not a... |
1501.04134 | Anzhong Wang | Miao Tian, Xinwen Wang, M.F. da Silva, Anzhong Wang | Gravitational collapse and formation of universal horizons | revtex4, 4 figures. Typos are corrected, and new references are added | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we first generalize the definition of stationary universal
horizons to dynamical ones, and then show that (dynamical) universal horizons
can be formed from realistic gravitational collapse. This is done by
constructing analytical models of a collapsing spherically symmetric star with
finite thickness i... | [
{
"created": "Fri, 16 Jan 2015 23:32:38 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jan 2015 17:24:00 GMT",
"version": "v2"
}
] | 2015-01-27 | [
[
"Tian",
"Miao",
""
],
[
"Wang",
"Xinwen",
""
],
[
"da Silva",
"M. F.",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we first generalize the definition of stationary universal horizons to dynamical ones, and then show that (dynamical) universal horizons can be formed from realistic gravitational collapse. This is done by constructing analytical models of a collapsing spherically symmetric star with finite thickness in ... |
gr-qc/0501018 | Sanjeev S. Seahra | Sanjeev S. Seahra | Naked shell singularities on the brane | REVTeX4, 13 pages, 6 figures, references and comments added | Phys.Rev. D71 (2005) 084020 | 10.1103/PhysRevD.71.084020 | null | gr-qc hep-th | null | By utilizing non-standard slicings of 5-dimensional Schwarzschild and
Schwarzschild-AdS manifolds based on isotropic coordinates, we generate static
and spherically symmetric braneworld spacetimes containing shell-like naked
null singularities. For planar slicings, we find that the brane-matter sourcing
the solution ... | [
{
"created": "Fri, 7 Jan 2005 15:58:48 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jan 2005 12:42:59 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Seahra",
"Sanjeev S.",
""
]
] | By utilizing non-standard slicings of 5-dimensional Schwarzschild and Schwarzschild-AdS manifolds based on isotropic coordinates, we generate static and spherically symmetric braneworld spacetimes containing shell-like naked null singularities. For planar slicings, we find that the brane-matter sourcing the solution is... |
2308.11695 | Dr. Sudhaker Upadhyay | Jyotish Kumar, Sudhaker Upadhyay and Himanshu Kumar Sudhanshu | Small Black String Thermodynamics | 12 pages, 6 captioned figures, published in Physica Scripta | Phys. Scr. 98 (2023) 095306 | 10.1088/1402-4896/aceec3 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider a cylindrically symmetric solution for the field equations of
Einstein-Hilbert action with a negative cosmological constant in four
dimensions. The small statistical fluctuation in the equilibrium thermodynamics
of the black string solution is investigated. The small black string under the
influence of sm... | [
{
"created": "Tue, 22 Aug 2023 17:27:11 GMT",
"version": "v1"
}
] | 2023-08-24 | [
[
"Kumar",
"Jyotish",
""
],
[
"Upadhyay",
"Sudhaker",
""
],
[
"Sudhanshu",
"Himanshu Kumar",
""
]
] | We consider a cylindrically symmetric solution for the field equations of Einstein-Hilbert action with a negative cosmological constant in four dimensions. The small statistical fluctuation in the equilibrium thermodynamics of the black string solution is investigated. The small black string under the influence of smal... |
1912.11227 | Chol Jun Kim | Kim Jik-su, Kim Chol-jun | A Special Class of the Scalar-Tensor Gravity with Scalar-Matter Direct
Coupling | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A role of the scalar-matter direct coupling in the evolution of scalar-tensor
gravity was studied. If the coupling functions in the generalized scalar-tensor
gravity satisfy a definite equation the scalar-tensor gravity is reduced to
Einstein's tensor gravity. We consider the issue in Jordan frame and then
Einstein f... | [
{
"created": "Tue, 24 Dec 2019 06:55:17 GMT",
"version": "v1"
}
] | 2019-12-25 | [
[
"Jik-su",
"Kim",
""
],
[
"Chol-jun",
"Kim",
""
]
] | A role of the scalar-matter direct coupling in the evolution of scalar-tensor gravity was studied. If the coupling functions in the generalized scalar-tensor gravity satisfy a definite equation the scalar-tensor gravity is reduced to Einstein's tensor gravity. We consider the issue in Jordan frame and then Einstein fra... |
gr-qc/9507058 | Gerald Horwitz | Gerald Horwitz | Time and Entropy from Semi-classical Tunneling of the Cosmological Scale
Function | 17 pages;, no figure. latex 2e, To appear in Moscow Quantum Gravity
Seminar, June 12-19, 1995, latex correction! | Int.J.Mod.Phys.D5:885-902,1996 | 10.1142/S0218271896000539 | ITP-UH-19-95 | gr-qc | null | Two major apparently unrelated problems, that of the origin of time in the
universe associated with quantum gravity and to the entropy in de Sitter
cosmological models, are found to have their origin in a single physical
phenomenon: the semi-classical tunneling through a classically forbidden region
of the cosmologic... | [
{
"created": "Mon, 31 Jul 1995 13:03:11 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 1995 13:41:57 GMT",
"version": "v2"
}
] | 2011-04-15 | [
[
"Horwitz",
"Gerald",
""
]
] | Two major apparently unrelated problems, that of the origin of time in the universe associated with quantum gravity and to the entropy in de Sitter cosmological models, are found to have their origin in a single physical phenomenon: the semi-classical tunneling through a classically forbidden region of the cosmological... |
gr-qc/9811039 | Olaf Richter | C. Klein, O. Richter | Riemann-Hilbert Problems for the Ernst Equation and Fibre Bundles | 12 pages, to be published in Journal of Geometry and Physics | J.Geom.Phys. 30 (1999) 331-342 | 10.1016/S0393-0440(98)00067-9 | LMU-TPW 98-16 | gr-qc | null | Riemann--Hilbert techniques are used in the theory of completely integrable
differential equations to generate solutions that contain a free function which
can be used at least in principle to solve initial or boundary value problems.
The solution of a boundary value problem is thus reduced to the identification
of t... | [
{
"created": "Thu, 12 Nov 1998 09:46:47 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Klein",
"C.",
""
],
[
"Richter",
"O.",
""
]
] | Riemann--Hilbert techniques are used in the theory of completely integrable differential equations to generate solutions that contain a free function which can be used at least in principle to solve initial or boundary value problems. The solution of a boundary value problem is thus reduced to the identification of the... |
2108.10706 | Andrea Giusti | Andrea Giusti, Stefan Zentarra, Lavinia Heisenberg, Valerio Faraoni | First-order thermodynamics of Horndeski gravity | 15 pages, no figures | null | 10.1103/PhysRevD.105.124011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend to the Horndeski realm the irreversible thermodynamics description
of gravity previously studied in "first generation" scalar-tensor theories. We
identify a subclass of Horndeski theories as an out-of--equilibrium state,
while general relativity corresponds to an equilibrium state. In this context,
we ident... | [
{
"created": "Tue, 24 Aug 2021 13:12:17 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Giusti",
"Andrea",
""
],
[
"Zentarra",
"Stefan",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Faraoni",
"Valerio",
""
]
] | We extend to the Horndeski realm the irreversible thermodynamics description of gravity previously studied in "first generation" scalar-tensor theories. We identify a subclass of Horndeski theories as an out-of--equilibrium state, while general relativity corresponds to an equilibrium state. In this context, we identif... |
1006.5150 | Nicholas Tsamis | Maria G. Romania (University of Crete), N. C. Tsamis (University of
Crete) and R. P. Woodard (University of Florida) | Possible Enhancement of High Frequency Gravitational Waves | 27 pages, 11 figures, LaTeX.2e | Class.Quant.Grav.28:075013,2011 | 10.1088/0264-9381/28/7/075013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the tensor perturbations in a class of non-local, purely
gravitational models which naturally end inflation in a distinctive phase of
oscillations with slight and short violations of the weak energy condition. We
find the usual generic form for the tensor power spectrum. The presence of the
oscillatory phase... | [
{
"created": "Sat, 26 Jun 2010 15:52:15 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Mar 2011 21:06:36 GMT",
"version": "v2"
}
] | 2011-03-18 | [
[
"Romania",
"Maria G.",
"",
"University of Crete"
],
[
"Tsamis",
"N. C.",
"",
"University of\n Crete"
],
[
"Woodard",
"R. P.",
"",
"University of Florida"
]
] | We study the tensor perturbations in a class of non-local, purely gravitational models which naturally end inflation in a distinctive phase of oscillations with slight and short violations of the weak energy condition. We find the usual generic form for the tensor power spectrum. The presence of the oscillatory phase l... |
gr-qc/9603026 | Henk van Elst | Henk van Elst, Claes Uggla | General Relativistic 1+3 Orthonormal Frame Approach Revisited | 41 pages, uufiles encoded postscript file, submitted to Phys. Rev. D | Class.Quant.Grav. 14 (1997) 2673-2695 | 10.1088/0264-9381/14/9/021 | QMW-AU-96005 | gr-qc | null | The equations of the 1+3 orthonormal frame approach are explicitly presented
and discussed. Natural choices of local coordinates are mentioned. A
dimensionless formulation is subsequently given. It is demonstrated how one can
obtain a number of interesting problems by specializing the general equations.
In particular... | [
{
"created": "Mon, 18 Mar 1996 15:24:26 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"van Elst",
"Henk",
""
],
[
"Uggla",
"Claes",
""
]
] | The equations of the 1+3 orthonormal frame approach are explicitly presented and discussed. Natural choices of local coordinates are mentioned. A dimensionless formulation is subsequently given. It is demonstrated how one can obtain a number of interesting problems by specializing the general equations. In particular, ... |
2008.09950 | Fei Qu | Fei Qu, Si-Jiang Yang, Zhi Wang, Ji-Rong Ren | Weak cosmic censorship conjecture is not violated for a rotating linear
dilaton black hole | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the validity of the weak cosmic censorship
conjecture(WCCC) for a rotating linear dilaton black hole from two different
methods. By using the classsical ingoing test particle method, we obtain the
same results as given in the new version of gedanken experiment recently
proposed by Wald. ... | [
{
"created": "Sun, 23 Aug 2020 03:21:54 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 2021 16:24:23 GMT",
"version": "v2"
}
] | 2021-04-22 | [
[
"Qu",
"Fei",
""
],
[
"Yang",
"Si-Jiang",
""
],
[
"Wang",
"Zhi",
""
],
[
"Ren",
"Ji-Rong",
""
]
] | In this paper, we investigate the validity of the weak cosmic censorship conjecture(WCCC) for a rotating linear dilaton black hole from two different methods. By using the classsical ingoing test particle method, we obtain the same results as given in the new version of gedanken experiment recently proposed by Wald. We... |
2011.15025 | Jiri Kovar | Ji\v{r}\'i Kov\'a\v{r}, Yasufumi Kojima, Petr Slan\'y, Zden\v{e}k
Stuchl\'ik, Vladim\'ir Karas | Charged fluids encircling compact objects: force representations and
conformal geometries | 23 pages, 3 figures | Classical and Quantum Gravity, 37, 245007 (2020) | 10.1088/1361-6382/abbe70 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Charged fluids rotating around compact objects can form unique equilibrium
structures when ambient large-scale electromagnetic fields combine with strong
gravity. Equatorial as well as off-equatorial toroidal structures are among
such figures of equilibrium with a direct relevance for astrophysics. To
investigate the... | [
{
"created": "Mon, 30 Nov 2020 17:28:46 GMT",
"version": "v1"
}
] | 2020-12-30 | [
[
"Kovář",
"Jiří",
""
],
[
"Kojima",
"Yasufumi",
""
],
[
"Slaný",
"Petr",
""
],
[
"Stuchlík",
"Zdeněk",
""
],
[
"Karas",
"Vladimír",
""
]
] | Charged fluids rotating around compact objects can form unique equilibrium structures when ambient large-scale electromagnetic fields combine with strong gravity. Equatorial as well as off-equatorial toroidal structures are among such figures of equilibrium with a direct relevance for astrophysics. To investigate their... |
2211.15537 | Suraj Maurya | Suraj Maurya, Rahul Nigam and Sashideep Gutti | Maximal hypersurface in a D-dimensional dynamical spacetime | 16 pages, 14 figures | Phys. Rev. D 109, 044019 (2024) | 10.1103/PhysRevD.109.044019 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this article, we set up a variational problem to arrive at the equation of
the maximal hypersurface in the interior of a spherically symmetric evolving
trapped region. In the first part of the article, we present the Lagrangian and
the corresponding Euler-Lagrange equations that maximize the interior volume of
a t... | [
{
"created": "Mon, 28 Nov 2022 16:43:50 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Feb 2024 11:58:47 GMT",
"version": "v2"
}
] | 2024-07-01 | [
[
"Maurya",
"Suraj",
""
],
[
"Nigam",
"Rahul",
""
],
[
"Gutti",
"Sashideep",
""
]
] | In this article, we set up a variational problem to arrive at the equation of the maximal hypersurface in the interior of a spherically symmetric evolving trapped region. In the first part of the article, we present the Lagrangian and the corresponding Euler-Lagrange equations that maximize the interior volume of a tra... |
1507.02998 | Christopher Moore | Christopher J. Moore, Jonathan R. Gair | Testing the "no-hair" property of black holes with X-ray observations of
accretion disks | 20 pages, 11 figures, accepted for publication in Physical Review D | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accretion disks around black holes radiate a significant fraction of the rest
mass of the accreting material in the form of thermal radiation from within a
few gravitational radii of the black hole ($ r \lesssim 20 G M / c^{2}$). In
addition, the accreting matter may also be illuminated by hard X-rays from the
surrou... | [
{
"created": "Fri, 10 Jul 2015 19:36:48 GMT",
"version": "v1"
}
] | 2015-07-13 | [
[
"Moore",
"Christopher J.",
""
],
[
"Gair",
"Jonathan R.",
""
]
] | Accretion disks around black holes radiate a significant fraction of the rest mass of the accreting material in the form of thermal radiation from within a few gravitational radii of the black hole ($ r \lesssim 20 G M / c^{2}$). In addition, the accreting matter may also be illuminated by hard X-rays from the surround... |
1009.2783 | Marcelo Araujo | M. E. Araujo and W.R. Stoeger | Using Time Drift of Cosmological Redshifts to find the Mass-Energy
Density of the Universe | 17 pages | Phys.Rev.D82:123513,2010 | 10.1103/PhysRevD.82.123513 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we show that the mass-energy density of the Universe can be
fully determined in terms of the cosmological redshifts, their time drifts and
angular-diameter distance (observer area distance). Besides providing an
indirect measurement of the mass-energy density of the Universe, we show how
one can use the... | [
{
"created": "Tue, 14 Sep 2010 20:47:53 GMT",
"version": "v1"
}
] | 2010-12-24 | [
[
"Araujo",
"M. E.",
""
],
[
"Stoeger",
"W. R.",
""
]
] | In this paper we show that the mass-energy density of the Universe can be fully determined in terms of the cosmological redshifts, their time drifts and angular-diameter distance (observer area distance). Besides providing an indirect measurement of the mass-energy density of the Universe, we show how one can use the t... |
gr-qc/9803094 | Andrew Liddle | Diego F Torres, Franz E Schunck and Andrew R Liddle | Brans-Dicke Boson Stars: Configurations and Stability through Cosmic
History | 9 pages RevTeX file with nine figures incorporated (uses RevTeX and
epsf) | Class.Quant.Grav.15:3701-3718,1998 | 10.1088/0264-9381/15/11/027 | SUSSEX-AST 98/3-5 | gr-qc | null | We make a detailed study of boson star configurations in Jordan--Brans--Dicke
theory, studying both equilibrium properties and stability, and considering
boson stars existing at different cosmic epochs. We show that boson stars can
be stable at any time of cosmic history and that equilibrium stars are denser
in the p... | [
{
"created": "Fri, 27 Mar 1998 15:55:18 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Torres",
"Diego F",
""
],
[
"Schunck",
"Franz E",
""
],
[
"Liddle",
"Andrew R",
""
]
] | We make a detailed study of boson star configurations in Jordan--Brans--Dicke theory, studying both equilibrium properties and stability, and considering boson stars existing at different cosmic epochs. We show that boson stars can be stable at any time of cosmic history and that equilibrium stars are denser in the pas... |
0812.4489 | Hao Wei | Hao Wei | Relaxing the Cosmological Constraints on Unparticle Dark Component | 11 pages, 5 figures, revtex4; v2: discussions added, accepted by Eur.
Phys. J. C; v3: published version | Eur.Phys.J.C62:579-586,2009 | 10.1140/epjc/s10052-009-1056-5 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unparticle physics has been an active field since the seminal work of Georgi.
Recently, many constraints on unparticles from various observations have been
considered in the literature. In particular, the cosmological constraints on
the unparticle dark component put it in a serious situation. In this work, we
try to ... | [
{
"created": "Wed, 24 Dec 2008 10:10:07 GMT",
"version": "v1"
},
{
"created": "Fri, 15 May 2009 03:24:19 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Jul 2009 07:00:00 GMT",
"version": "v3"
}
] | 2009-07-30 | [
[
"Wei",
"Hao",
""
]
] | Unparticle physics has been an active field since the seminal work of Georgi. Recently, many constraints on unparticles from various observations have been considered in the literature. In particular, the cosmological constraints on the unparticle dark component put it in a serious situation. In this work, we try to fi... |
2012.14291 | Vipin Dubey | Umesh Kumar Sharma, Gunjan Varshney, Vipin Chandra Dubey | Barrow agegraphic dark energy | null | null | 10.1142/S0218271821500218 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In this work, we propose a new dark energy model by applying the Barrow
entropy and the holographic principle, with a time scale as IR cut off.
Analysing the conformal time as well as universe's age as infrared cut-offs, we
explore the cosmological importance of the suggested dark energy models and
examine the univer... | [
{
"created": "Thu, 24 Dec 2020 15:21:34 GMT",
"version": "v1"
}
] | 2020-12-29 | [
[
"Sharma",
"Umesh Kumar",
""
],
[
"Varshney",
"Gunjan",
""
],
[
"Dubey",
"Vipin Chandra",
""
]
] | In this work, we propose a new dark energy model by applying the Barrow entropy and the holographic principle, with a time scale as IR cut off. Analysing the conformal time as well as universe's age as infrared cut-offs, we explore the cosmological importance of the suggested dark energy models and examine the universe... |
2312.06615 | Bouzenada Abdelmalek . | Faizuddin Ahmed and Abdelmalek Bouzenada | Effects of rainbow gravity on charge-free scalar Bosons in Bonnor-Melvin
s universe with cosmological constant | null | null | null | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | In this paper, we explore the relativistic quantum motion of spin-zero scalar
particles influenced by rainbow gravity's in the background of a magnetic
solution. Our focus is on the Bonnor-Melvin magnetic space-time, a
four-dimensional solution featuring a non-zero cosmological constant. To
analyze this scenario, we ... | [
{
"created": "Fri, 8 Dec 2023 10:56:32 GMT",
"version": "v1"
}
] | 2023-12-12 | [
[
"Ahmed",
"Faizuddin",
""
],
[
"Bouzenada",
"Abdelmalek",
""
]
] | In this paper, we explore the relativistic quantum motion of spin-zero scalar particles influenced by rainbow gravity's in the background of a magnetic solution. Our focus is on the Bonnor-Melvin magnetic space-time, a four-dimensional solution featuring a non-zero cosmological constant. To analyze this scenario, we so... |
1508.00732 | Sabine Hossenfelder | S. Hossenfelder | A relativistic acoustic metric for planar black holes | 11 pages, no figures, replaced with published version | Phys.Lett. B752 (2016) 13-17 | 10.1016/j.physletb.2015.11.026 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate here that the metric of a planar black hole in asymptotic
Anti-de Sitter space can, on a slice of dimension 3+1, be reproduced as a
relativistic acoustic metric. This completes an earlier calculation in which
the non-relativistic limit was used, and also serves to obtain a concrete form
of the Lagrangi... | [
{
"created": "Tue, 4 Aug 2015 11:11:22 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Aug 2015 14:25:57 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Dec 2015 13:33:17 GMT",
"version": "v3"
}
] | 2015-12-22 | [
[
"Hossenfelder",
"S.",
""
]
] | We demonstrate here that the metric of a planar black hole in asymptotic Anti-de Sitter space can, on a slice of dimension 3+1, be reproduced as a relativistic acoustic metric. This completes an earlier calculation in which the non-relativistic limit was used, and also serves to obtain a concrete form of the Lagrangian... |
1812.00938 | Jorge L. Fuentes | Jorge L. Fuentes, Usman A. Gillani and Karim A. Malik | Linear cosmological perturbations in almost scale-invariant fourth-order
gravity | 13 pages. Companion Mathematica notebooks can be found in
https://github.com/jorchfv/Linear-Gauss-Bonnet | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a class of almost scale-invariant modified gravity theories, using a
particular form of $f(R, G) = \alpha R^2 + \beta G \log G$ where $R$ and $G$
are the Ricci and Gauss-Bonnet scalars, respectively and $\alpha$, $\beta$ are
arbitrary constants. We derive the Einstein-like field equations to first order
in c... | [
{
"created": "Mon, 3 Dec 2018 18:06:06 GMT",
"version": "v1"
}
] | 2018-12-04 | [
[
"Fuentes",
"Jorge L.",
""
],
[
"Gillani",
"Usman A.",
""
],
[
"Malik",
"Karim A.",
""
]
] | We study a class of almost scale-invariant modified gravity theories, using a particular form of $f(R, G) = \alpha R^2 + \beta G \log G$ where $R$ and $G$ are the Ricci and Gauss-Bonnet scalars, respectively and $\alpha$, $\beta$ are arbitrary constants. We derive the Einstein-like field equations to first order in cos... |
2301.12464 | Julio Cesar Fabris | Marcelo H. Alvarenga, J\'ulio C. Fabris and Hermano Velten | Using cosmological perturbation theory to distinguish between General
Relativity and Unimodular Gravity | Latex file, 9 pages. Contribution to the proceedings of the
International Conference on Particle Physics and Astrophysics (ICCPA-2022)} | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unimodular Gravity is one of the oldest geometric gravity theory alternative
to General Relativity. Essentially, it is based on the Einstein-Hilbert
Lagrangian with an additional constraint on the determinant of the metric. It
can be explicitly shown that Unimodular Gravity can be recast as General
Relativity in pres... | [
{
"created": "Sun, 29 Jan 2023 15:24:43 GMT",
"version": "v1"
}
] | 2023-01-31 | [
[
"Alvarenga",
"Marcelo H.",
""
],
[
"Fabris",
"Júlio C.",
""
],
[
"Velten",
"Hermano",
""
]
] | Unimodular Gravity is one of the oldest geometric gravity theory alternative to General Relativity. Essentially, it is based on the Einstein-Hilbert Lagrangian with an additional constraint on the determinant of the metric. It can be explicitly shown that Unimodular Gravity can be recast as General Relativity in presen... |
gr-qc/9905087 | John Baez | John C. Baez | An Introduction to Spin Foam Models of Quantum Gravity and BF Theory | 55 pages LaTeX, 31 encapsulated Postscript figures | Lect. Notes Phys. 543 (2000) 25-94 | null | null | gr-qc hep-th math.QA | null | In loop quantum gravity we now have a clear picture of the quantum geometry
of space, thanks in part to the theory of spin networks. The concept of `spin
foam' is intended to serve as a similar picture for the quantum geometry of
spacetime. In general, a spin network is a graph with edges labelled by
representations ... | [
{
"created": "Fri, 21 May 1999 23:25:08 GMT",
"version": "v1"
}
] | 2015-02-13 | [
[
"Baez",
"John C.",
""
]
] | In loop quantum gravity we now have a clear picture of the quantum geometry of space, thanks in part to the theory of spin networks. The concept of `spin foam' is intended to serve as a similar picture for the quantum geometry of spacetime. In general, a spin network is a graph with edges labelled by representations an... |
1809.08557 | Thomas-Paul Hack | Klaus Fredenhagen, Thomas-Paul Hack, Nicola Pinamonti | Thermodynamics of Quantum Fields in Nonstationary Spacetimes | Contribution to "Particles, String and the Early Universe - Research
Results of the Collaborative Research Centre SFB 676 in Hamburg | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum field theory (QFT) on non-stationary spacetimes is well understood
from the side of the algebra of observables. The state space, however, is
largely unexplored, due to the non-existence of distinguished states (vacuum,
scattering states, thermal states). Project C7 of the SFB 676 was focused on
characterisati... | [
{
"created": "Sun, 23 Sep 2018 08:58:59 GMT",
"version": "v1"
}
] | 2018-09-25 | [
[
"Fredenhagen",
"Klaus",
""
],
[
"Hack",
"Thomas-Paul",
""
],
[
"Pinamonti",
"Nicola",
""
]
] | Quantum field theory (QFT) on non-stationary spacetimes is well understood from the side of the algebra of observables. The state space, however, is largely unexplored, due to the non-existence of distinguished states (vacuum, scattering states, thermal states). Project C7 of the SFB 676 was focused on characterisation... |
1010.5444 | Muxin Han | Muxin Han, Thomas Thiemann | Commuting Simplicity and Closure Constraints for 4D Spin Foam Models | 41 pages, 4 figures | Class. Quantum Grav. 30 (2013) 235024 | 10.1088/0264-9381/30/23/235024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin Foam Models are supposed to be discretised path integrals for quantum
gravity constructed from the Plebanski-Holst action. The reason for there being
several models currently under consideration is that no consensus has been
reached for how to implement the simplicity constraints. Indeed, none of these
models st... | [
{
"created": "Tue, 26 Oct 2010 16:15:51 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Oct 2013 10:02:05 GMT",
"version": "v2"
}
] | 2013-11-01 | [
[
"Han",
"Muxin",
""
],
[
"Thiemann",
"Thomas",
""
]
] | Spin Foam Models are supposed to be discretised path integrals for quantum gravity constructed from the Plebanski-Holst action. The reason for there being several models currently under consideration is that no consensus has been reached for how to implement the simplicity constraints. Indeed, none of these models stri... |
1910.03666 | Elizabeth Winstanley | Visakan Balakumar and Elizabeth Winstanley | Hadamard renormalization for a charged scalar field | 31 pages, new section comparing with other approaches to
renormalization, minor edits | null | 10.1088/1361-6382/ab6b6e | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hadamard representation of the Green's function of a quantum field on a
curved space-time is a powerful tool for computations of renormalized
expectation values. We study the Hadamard form of the Feynman Green's function
for a massive charged complex scalar field in an arbitrary number of space-time
dimensions. E... | [
{
"created": "Tue, 8 Oct 2019 20:17:04 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jan 2020 18:29:09 GMT",
"version": "v2"
}
] | 2020-04-08 | [
[
"Balakumar",
"Visakan",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | The Hadamard representation of the Green's function of a quantum field on a curved space-time is a powerful tool for computations of renormalized expectation values. We study the Hadamard form of the Feynman Green's function for a massive charged complex scalar field in an arbitrary number of space-time dimensions. Exp... |
0806.1018 | Jose' P. S. Lemos | Gon\c{c}alo A. S. Dias, Jos\'e P. S. Lemos | Hamiltonian thermodynamics of three-dimensional dilatonic black holes | 34 pages, 3 figures, references added, minor changes in the revised
version | Phys.Rev.D78:044010,2008 | 10.1103/PhysRevD.78.044010 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The action for a class of three-dimensional dilaton-gravity theories with a
cosmological constant can be recast in a Brans-Dicke type action, with its free
$\omega$ parameter. These theories have static spherically symmetric black
holes. Those with well formulated asymptotics are studied through a Hamiltonian
formali... | [
{
"created": "Thu, 5 Jun 2008 17:34:07 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Aug 2008 21:53:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dias",
"Gonçalo A. S.",
""
],
[
"Lemos",
"José P. S.",
""
]
] | The action for a class of three-dimensional dilaton-gravity theories with a cosmological constant can be recast in a Brans-Dicke type action, with its free $\omega$ parameter. These theories have static spherically symmetric black holes. Those with well formulated asymptotics are studied through a Hamiltonian formalism... |
2009.13334 | Xiao Yan Chew | Xiao Yan Chew and Kok-Geng Lim | Non--Abelian Wormholes Threaded by Yang--Mills--Higgs Field in the BPS
Limit | 11 pages with 15 figures | Phys. Rev. D 102, 124068 (2020) | 10.1103/PhysRevD.102.124068 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Bogomol'nyi-Prasad-Sommerfield (BPS) limit of
Einstein-Yang-Mills-Higgs theory, we construct numerically a non-Abelian
wormhole supported by a phantom field. The probe limit is the Yang-Mills-Higgs
field in the background of Ellis wormhole when the gravity is switched off. The
wormhole solutions possess the Ya... | [
{
"created": "Mon, 28 Sep 2020 14:00:19 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Sep 2020 02:58:43 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Oct 2020 07:56:06 GMT",
"version": "v3"
},
{
"created": "Mon, 4 Jan 2021 02:10:11 GMT",
"version": "v4"
}
] | 2021-01-06 | [
[
"Chew",
"Xiao Yan",
""
],
[
"Lim",
"Kok-Geng",
""
]
] | In the Bogomol'nyi-Prasad-Sommerfield (BPS) limit of Einstein-Yang-Mills-Higgs theory, we construct numerically a non-Abelian wormhole supported by a phantom field. The probe limit is the Yang-Mills-Higgs field in the background of Ellis wormhole when the gravity is switched off. The wormhole solutions possess the Yang... |
1610.03805 | Wolfgang Tichy | Wolfgang Tichy | The initial value problem as it relates to numerical relativity | 64 pages, 5 figures, updated with version published in Reports on
Progress in Physics | Reports on Progress in Physics 80, 026901 (2017) | 10.1088/1361-6633/80/2/026901 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spacetime is foliated by spatial hypersurfaces in the 3+1 split of General
Relativity. The initial value problem then consists of specifying initial data
for all relevant fields on one such a spatial hypersurface. These fields are
the 3-metric and extrinsic curvature together with matter fields such as fluid
velocity... | [
{
"created": "Wed, 12 Oct 2016 17:52:17 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Dec 2016 14:32:04 GMT",
"version": "v2"
}
] | 2017-01-04 | [
[
"Tichy",
"Wolfgang",
""
]
] | Spacetime is foliated by spatial hypersurfaces in the 3+1 split of General Relativity. The initial value problem then consists of specifying initial data for all relevant fields on one such a spatial hypersurface. These fields are the 3-metric and extrinsic curvature together with matter fields such as fluid velocity, ... |
2012.06869 | Grigoris Panotopoulos | Grigoris Panotopoulos, Ilidio Lopes and Angel Rincon | Lagrangian formulation for an extended cosmological equation-of-state | 6 pages, 3 figures | Phys. Dark Univ. 31 (2021) 100751 | 10.1016/j.dark.2020.100751 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the extended cosmological equation-of-state developed starting
from a Chaplygin equation-of-state, recently applied to stellar modeling, is a
viable dark energy model consistent with standard scalar potentials. Moreover
we find a Lagrangian formulation based on a canonical scalar field with the
appropria... | [
{
"created": "Sat, 12 Dec 2020 17:28:41 GMT",
"version": "v1"
}
] | 2020-12-15 | [
[
"Panotopoulos",
"Grigoris",
""
],
[
"Lopes",
"Ilidio",
""
],
[
"Rincon",
"Angel",
""
]
] | We show that the extended cosmological equation-of-state developed starting from a Chaplygin equation-of-state, recently applied to stellar modeling, is a viable dark energy model consistent with standard scalar potentials. Moreover we find a Lagrangian formulation based on a canonical scalar field with the appropriate... |
gr-qc/9408032 | Robert Mann | J.S.F. Chan and R.B. Mann | Gravitation and Cosmology in Generalized (1+1)-dimensional dilaton
gravity | 34 pages | Class.Quant.Grav.12:351-372,1995 | 10.1088/0264-9381/12/2/006 | null | gr-qc | null | The actions of the ``$R=T$'' and string-inspired theories of gravity in (1+1)
dimensions are generalized into one single action which is characterized by two
functions. We discuss differing interpretations of the matter stress-energy
tensor, and show how two such different interpretations can yield two different
sets... | [
{
"created": "Thu, 25 Aug 1994 20:04:37 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Chan",
"J. S. F.",
""
],
[
"Mann",
"R. B.",
""
]
] | The actions of the ``$R=T$'' and string-inspired theories of gravity in (1+1) dimensions are generalized into one single action which is characterized by two functions. We discuss differing interpretations of the matter stress-energy tensor, and show how two such different interpretations can yield two different sets o... |
gr-qc/9406035 | null | Bjorn Jensen and Jarom\'ir Ku\v{c}era | A reinterpretation of the Taub singularity | 11, Oslo-TP-9-94, TP-MUBR 94-06/1 | null | 10.1016/0375-9601(94)90081-7 | null | gr-qc | null | We reinterpret the well known Taub-singularity in terms of a cylinder
symmetric geometry. It is shown that a cylindrical analog to the Einstein-Rosen
bridge as well as a cosmic string will be present in the geometry.
| [
{
"created": "Tue, 21 Jun 1994 13:16:57 GMT",
"version": "v1"
}
] | 2016-08-14 | [
[
"Jensen",
"Bjorn",
""
],
[
"Kučera",
"Jaromír",
""
]
] | We reinterpret the well known Taub-singularity in terms of a cylinder symmetric geometry. It is shown that a cylindrical analog to the Einstein-Rosen bridge as well as a cosmic string will be present in the geometry. |
gr-qc/0607024 | Fernando Mendez | R. Aloisio, A. Galante, A.F. Grillo, S. Liberati, E. Luzio and F.
Mendez | Modified Special Relativity on a fluctuating spacetime | 7 pages, no figures | Phys.Rev. D74 (2006) 085017 | 10.1103/PhysRevD.74.085017 | null | gr-qc | null | It was recently proposed that deformations of the relativistic symmetry, as
those considered in Deformed Special Relativity (DSR), can be seen as the
outcome of a measurement theory in the presence of non-negligible (albeit
small) quantum gravitational fluctuations [1,2]. In this paper we explicitly
consider the case... | [
{
"created": "Thu, 6 Jul 2006 14:35:36 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Aloisio",
"R.",
""
],
[
"Galante",
"A.",
""
],
[
"Grillo",
"A. F.",
""
],
[
"Liberati",
"S.",
""
],
[
"Luzio",
"E.",
""
],
[
"Mendez",
"F.",
""
]
] | It was recently proposed that deformations of the relativistic symmetry, as those considered in Deformed Special Relativity (DSR), can be seen as the outcome of a measurement theory in the presence of non-negligible (albeit small) quantum gravitational fluctuations [1,2]. In this paper we explicitly consider the case o... |
2007.10259 | Naveena Kumara A | Kartheek Hegde, A. Naveena Kumara, C.L. Ahmed Rizwan, Md Sabir Ali and
Ajith K.M | Null Geodesics and Thermodynamic Phase Transition of Four-Dimensional
Gauss-Bonnet AdS Black Hole | 18 pages, 5 figures | null | 10.1016/j.aop.2021.168461 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modified gravity theories are of great interest in both observational and
theoretical studies. In this article we study the correlation between the null
geodesics in the background of a four-dimensional Einstein-Maxwell-Gauss-Bonnet
AdS black hole, a modification of Einstein gravity, and it's thermodynamic
phase tran... | [
{
"created": "Mon, 20 Jul 2020 16:47:02 GMT",
"version": "v1"
}
] | 2021-05-19 | [
[
"Hegde",
"Kartheek",
""
],
[
"Kumara",
"A. Naveena",
""
],
[
"Rizwan",
"C. L. Ahmed",
""
],
[
"Ali",
"Md Sabir",
""
],
[
"M",
"Ajith K.",
""
]
] | Modified gravity theories are of great interest in both observational and theoretical studies. In this article we study the correlation between the null geodesics in the background of a four-dimensional Einstein-Maxwell-Gauss-Bonnet AdS black hole, a modification of Einstein gravity, and it's thermodynamic phase transi... |
1202.2285 | Hristu Culetu | Hristu Culetu | Conformal time dependent Painleve-Gullstrand spacetime | 8 pages, no figures, one chapter added, new refs | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of an anisotropic fluid outside a star or a black hole
embedded in an expanding universe are investigated. One finds that, in
Painleve-Gullstrand coordinates, the heat flux of the cosmological fluid
vanishes, in spite of the nonzero value of a non-diagonal component of the
stress tensor. The pressures ... | [
{
"created": "Fri, 10 Feb 2012 15:42:30 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2012 15:06:24 GMT",
"version": "v2"
}
] | 2012-03-21 | [
[
"Culetu",
"Hristu",
""
]
] | The properties of an anisotropic fluid outside a star or a black hole embedded in an expanding universe are investigated. One finds that, in Painleve-Gullstrand coordinates, the heat flux of the cosmological fluid vanishes, in spite of the nonzero value of a non-diagonal component of the stress tensor. The pressures an... |
1905.01427 | Tuan Do | Tuan Q. Do, Sonnet Hung Q. Nguyen | No small hairs in anisotropic power-law Gauss-Bonnet inflation | 15 pages, two figures. To be published in Communications in Physics,
a leading physical journal in Vietnam | Communications in Physics 29, 173 (2019) | 10.15625/0868-3166/29/2/13677 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We will examine whether anisotropic hairs exist in a string-inspired
scalar-Gauss-Bonnet gravity model with the absence of potential of scalar field
during the inflationary phase. As a result, we are able to obtain the Bianchi
type I power-law solution to this model under the assumption that the scalar
field acts as ... | [
{
"created": "Sat, 4 May 2019 04:18:42 GMT",
"version": "v1"
}
] | 2019-05-16 | [
[
"Do",
"Tuan Q.",
""
],
[
"Nguyen",
"Sonnet Hung Q.",
""
]
] | We will examine whether anisotropic hairs exist in a string-inspired scalar-Gauss-Bonnet gravity model with the absence of potential of scalar field during the inflationary phase. As a result, we are able to obtain the Bianchi type I power-law solution to this model under the assumption that the scalar field acts as th... |
1405.4229 | Sunandan Gangopadhyay | Sunandan Gangopadhyay | Minimal length effects in black hole thermodynamics from tunneling
formalism | 9 pages Latex, To appear in Int.J.Theo.Phys | Int J Theor Phys 55 (2016) 617 | 10.1007/s10773-015-2699-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The tunneling formalism in the Hamilton-Jacobi approach is adopted to study
Hawking radiation of massless Dirac particles from spherically symmetric black
hole spacetimes incorporating the effects of the generalized uncertainty
principle. The Hawking temperature is found to contain corrections from the
generalized un... | [
{
"created": "Fri, 16 May 2014 16:19:40 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jul 2014 10:25:06 GMT",
"version": "v2"
},
{
"created": "Thu, 28 May 2015 14:16:15 GMT",
"version": "v3"
}
] | 2016-01-05 | [
[
"Gangopadhyay",
"Sunandan",
""
]
] | The tunneling formalism in the Hamilton-Jacobi approach is adopted to study Hawking radiation of massless Dirac particles from spherically symmetric black hole spacetimes incorporating the effects of the generalized uncertainty principle. The Hawking temperature is found to contain corrections from the generalized unce... |
1908.11647 | Sumati Surya | William J. Cunningham and Sumati Surya | Dimensionally Restricted Causal Set Quantum Gravity: Examples in Two and
Three Dimensions | 31 pages, 21 figures. Typos corrected, figures corrected, references
updated | null | 10.1088/1361-6382/ab60b7 | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dimensionally restricted non-perturbative causal set quantum
dynamics in $2$ and $3$ spacetime
dimensions with non-trivial global spatial topology. The causal set sample
space is generated from causal
embeddings into spacetime lattices with global spatial topology $S^1$ and
$T^2$ in $2$ and $3$
dimensi... | [
{
"created": "Fri, 30 Aug 2019 10:51:22 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Dec 2019 07:26:12 GMT",
"version": "v2"
}
] | 2020-04-08 | [
[
"Cunningham",
"William J.",
""
],
[
"Surya",
"Sumati",
""
]
] | We study dimensionally restricted non-perturbative causal set quantum dynamics in $2$ and $3$ spacetime dimensions with non-trivial global spatial topology. The causal set sample space is generated from causal embeddings into spacetime lattices with global spatial topology $S^1$ and $T^2$ in $2$ and $3$ dimensions, res... |
1810.08780 | Handhika Ramadhan | Byon N. Jayawiguna and Handhika S. Ramadhan | Charged black holes in higher-dimensional Eddington-inspired Born-Infeld
gravity | 36 pages, 16 figures, accepted for publication in Nucl. Phys. B | null | 10.1016/j.nuclphysb.2019.114615 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study static (electrically)-charged solutions of Eddington-inspired
Born-Infeld (EiBI) theory of gravity in general $D$-dimensional spacetime. We
consider both linear (Maxwell) as well as nonlinear electrodynamics for the
matter fields. In this particular work, the nonlinear theory we specifically
consider is the ... | [
{
"created": "Sat, 20 Oct 2018 09:53:11 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Oct 2018 14:31:19 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Nov 2018 02:55:36 GMT",
"version": "v3"
},
{
"created": "Fri, 5 Apr 2019 03:02:15 GMT",
"version": "v4"
}
] | 2019-06-26 | [
[
"Jayawiguna",
"Byon N.",
""
],
[
"Ramadhan",
"Handhika S.",
""
]
] | We study static (electrically)-charged solutions of Eddington-inspired Born-Infeld (EiBI) theory of gravity in general $D$-dimensional spacetime. We consider both linear (Maxwell) as well as nonlinear electrodynamics for the matter fields. In this particular work, the nonlinear theory we specifically consider is the Bo... |
2101.07265 | Kaloian Lozanov | Peter Adshead and Kaloian D. Lozanov | Self-gravitating Vector Dark Matter | 15 pages (9+6), 5 figures; matches published version | Phys. Rev. D 103, 103501 (2021) | 10.1103/PhysRevD.103.103501 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the non-relativistic limit of a massive vector field. We show that
the Cartesian spatial components of the vector behave as three identical,
non-interacting scalar fields. We find classes of spherical, cylindrical, and
planar self-gravitating vector solitons in the Newtonian limit. The
gravitational propert... | [
{
"created": "Mon, 18 Jan 2021 19:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jul 2021 19:26:41 GMT",
"version": "v2"
}
] | 2021-07-09 | [
[
"Adshead",
"Peter",
""
],
[
"Lozanov",
"Kaloian D.",
""
]
] | We derive the non-relativistic limit of a massive vector field. We show that the Cartesian spatial components of the vector behave as three identical, non-interacting scalar fields. We find classes of spherical, cylindrical, and planar self-gravitating vector solitons in the Newtonian limit. The gravitational propertie... |
1304.4844 | J. W. van Holten | J.W. van Holten | Single scalar cosmology | 9 pages, 7 figures v2: typo corrected; reference added; discussion
section added | Int. J. Mod. Phys. A 28 (2013), 1350132 | 10.1142/S0217751X13501327 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmology of flat FLRW universes dominated by a single scalar field is
discussed. General features of the evolution of the universe and the scalar
field are illustrated by specific examples. In particular the role of critical
points, where the scalar field is stationary, is emphasized and their
classification and... | [
{
"created": "Wed, 17 Apr 2013 14:55:12 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Sep 2013 07:46:31 GMT",
"version": "v2"
}
] | 2015-11-24 | [
[
"van Holten",
"J. W.",
""
]
] | The cosmology of flat FLRW universes dominated by a single scalar field is discussed. General features of the evolution of the universe and the scalar field are illustrated by specific examples. In particular the role of critical points, where the scalar field is stationary, is emphasized and their classification and i... |
1306.6541 | Ali Kaya | Ali Kaya | In-in formalism, pseudo-instantons and rethinking quantum cosmology | 9 pages, Essay written for the Gravity Research Foundation 2013
Awards for Essays on Gravitation, received honorable mention | null | 10.1142/S0218271814500266 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unlike flat space quantum field theories that focus on scattering amplitudes,
the main observables in quantum cosmology are correlation functions. The
systematic way of calculating correlators is called in-in formalism, which
requires only a single asymptotic region, i.e. past infinity. The rules in
perturbation theo... | [
{
"created": "Thu, 27 Jun 2013 15:13:03 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Kaya",
"Ali",
""
]
] | Unlike flat space quantum field theories that focus on scattering amplitudes, the main observables in quantum cosmology are correlation functions. The systematic way of calculating correlators is called in-in formalism, which requires only a single asymptotic region, i.e. past infinity. The rules in perturbation theory... |
2203.02685 | Yaoguang Zheng | Wen-Xiang Chen, Yao-Guang Zheng | Thermodynamic geometric analysis of BTZ black hole in f(R,{\phi})
Gravity | arXiv admin note: substantial text overlap with arXiv:2112.15032 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we obtain the thermodynamic geometry of the extended black hole
solution under f(R) gravity. This is the foundation of our work. We also obtain
the exact form of the f(R) model for some solutions. In the thermodynamic
analysis, we calculate the thermodynamic quantities such as temperature and
entropy of... | [
{
"created": "Sat, 5 Mar 2022 08:54:26 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Mar 2022 10:58:28 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Mar 2022 01:52:16 GMT",
"version": "v3"
}
] | 2022-03-28 | [
[
"Chen",
"Wen-Xiang",
""
],
[
"Zheng",
"Yao-Guang",
""
]
] | In this work, we obtain the thermodynamic geometry of the extended black hole solution under f(R) gravity. This is the foundation of our work. We also obtain the exact form of the f(R) model for some solutions. In the thermodynamic analysis, we calculate the thermodynamic quantities such as temperature and entropy of t... |
gr-qc/0204010 | Alberto Guijosa | Ulf H. Danielsson, Alberto Guijosa, Martin Kruczenski | Black Brane Entropy from Brane-Antibrane Systems | 6 pages, revtex; aimed at non-string-theorists. Invited talk at the
IV Mexican Workshop on Gravitation and Mathematical Physics, Chapala, Mexico,
November 2001 | Rev.Mex.Fis.49S2:61-66,2003 | null | ICN-UNAM-02/03 | gr-qc hep-th | null | In the context of string theory, it is possible to explain the microscopic
origin of the entropy of certain black holes in terms of D-brane systems. To
date, most of the cases studied in detail refer to extremal (supersymmetric) or
near-extremal black holes. In this work we propose a microscopic model for
certain bla... | [
{
"created": "Tue, 2 Apr 2002 21:01:48 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Danielsson",
"Ulf H.",
""
],
[
"Guijosa",
"Alberto",
""
],
[
"Kruczenski",
"Martin",
""
]
] | In the context of string theory, it is possible to explain the microscopic origin of the entropy of certain black holes in terms of D-brane systems. To date, most of the cases studied in detail refer to extremal (supersymmetric) or near-extremal black holes. In this work we propose a microscopic model for certain black... |
1310.1165 | Barun Majumder | Barun Majumder | The Effects of Minimal Length in Entropic Force Approach | 12 pages, to appear in Advances in High Energy Physics | Advances in High Energy Physics Volume 2013 (2013), Article ID
296836, 8 pages | 10.1155/2013/296836 | null | gr-qc astro-ph.CO hep-th physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With Verlinde's recent proposal which says that gravity can be identified
with an entropic force and considering the effects of generalized uncertainty
principle in the black hole entropy-area relation we derive the modified
equations for Newton's law of gravitation, modified Newtonian dynamics and
Einstein's general... | [
{
"created": "Fri, 4 Oct 2013 04:42:10 GMT",
"version": "v1"
}
] | 2013-11-11 | [
[
"Majumder",
"Barun",
""
]
] | With Verlinde's recent proposal which says that gravity can be identified with an entropic force and considering the effects of generalized uncertainty principle in the black hole entropy-area relation we derive the modified equations for Newton's law of gravitation, modified Newtonian dynamics and Einstein's general r... |
2107.13952 | Francesco Gozzini | Francesco Gozzini | A high-performance code for EPRL spin foam amplitudes | 26 pages, many figures and code snippets | null | 10.1088/1361-6382/ac2b0b | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present $\mathtt{\text{sl2cfoam-next}}$, a high-performance software
library for computing Lorentzian EPRL spin foam amplitudes. The library
improves on previous codes by many orders of magnitude in single-core
performance, can be parallelized on a large number of CPUs and on the GPU, and
can be used interactively... | [
{
"created": "Thu, 29 Jul 2021 13:20:46 GMT",
"version": "v1"
}
] | 2021-11-17 | [
[
"Gozzini",
"Francesco",
""
]
] | We present $\mathtt{\text{sl2cfoam-next}}$, a high-performance software library for computing Lorentzian EPRL spin foam amplitudes. The library improves on previous codes by many orders of magnitude in single-core performance, can be parallelized on a large number of CPUs and on the GPU, and can be used interactively. ... |
gr-qc/0401065 | Muhammad Sharif | M. Sharif | Dirac Equation in Standard Cosmological Models | null | Chin.J.Phys.40:526-531,2002 | null | null | gr-qc | null | The time equation associated to the Dirac Equation (DE) is studied for the
radiation-dominated Friedmann-Robertson-Walker (FRW) universe. The results are
analysed for small and large values of time. We also incorporate the
corrections of the paper studied by Zecca [1] for the matter-dominated FRW
universe.
| [
{
"created": "Thu, 15 Jan 2004 13:01:34 GMT",
"version": "v1"
}
] | 2008-11-07 | [
[
"Sharif",
"M.",
""
]
] | The time equation associated to the Dirac Equation (DE) is studied for the radiation-dominated Friedmann-Robertson-Walker (FRW) universe. The results are analysed for small and large values of time. We also incorporate the corrections of the paper studied by Zecca [1] for the matter-dominated FRW universe. |
2311.14130 | Neev Khera | Abhay Ashtekar, Neev Khera | Unified Treatment of Null and Spatial Infinity III: Asymptotically
Minkowski Space-times | References and minor clarifications added. Version to appear in JHEP.
36 pages, 1 figure | JHEP02(2024)210 | 10.1007/JHEP02(2024)210 | ArXiv ePrint: 2311.14130 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Spi framework provides a 4-dimensional approach to investigate the
asymptotic properties of gravitational fields as one recedes from isolated
systems in any space-like direction, without reference to a Cauchy surface. It
is well suited to unify descriptions at null and spatial infinity because
$\mathscr{I}$ arise... | [
{
"created": "Thu, 23 Nov 2023 17:57:55 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jan 2024 14:05:32 GMT",
"version": "v2"
}
] | 2024-03-13 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Khera",
"Neev",
""
]
] | The Spi framework provides a 4-dimensional approach to investigate the asymptotic properties of gravitational fields as one recedes from isolated systems in any space-like direction, without reference to a Cauchy surface. It is well suited to unify descriptions at null and spatial infinity because $\mathscr{I}$ arises ... |
gr-qc/0311078 | Patricio S. Letelier | Guillermo A. Gonzalez and Patricio S. Letelier | Exact General Relativistic Thick Disks | 11 pages, RevTex, 9 eps figs. Accepted for publication in PRD | Phys.Rev. D69 (2004) 044013 | 10.1103/PhysRevD.69.044013 | null | gr-qc astro-ph | null | A method to construct exact general relativistic thick disks that is a simple
generalization of the ``displace, cut and reflect'' method commonly used in
Newtonian, as well as, in Einstein theory of gravitation is presented. This
generalization consists in the addition of a new step in the above mentioned
method. The... | [
{
"created": "Mon, 24 Nov 2003 12:23:02 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gonzalez",
"Guillermo A.",
""
],
[
"Letelier",
"Patricio S.",
""
]
] | A method to construct exact general relativistic thick disks that is a simple generalization of the ``displace, cut and reflect'' method commonly used in Newtonian, as well as, in Einstein theory of gravitation is presented. This generalization consists in the addition of a new step in the above mentioned method. The n... |
1009.0936 | Philippe G. LeFloch | Philippe G. LeFloch and Luc Rozoy | Uniqueness of Kottler spacetime and Besse conjecture | 4 pages | null | null | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish a black hole uniqueness theorem for Schwarzschild-de Sitter
spacetime, also called Kottler spacetime, which satisfies Einstein's field
equations of general relativity with positive cosmological constant. Our result
concerns the class of static vacuum spacetimes with compact spacelike slices
and regular m... | [
{
"created": "Sun, 5 Sep 2010 17:45:20 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 2010 18:57:50 GMT",
"version": "v2"
}
] | 2010-09-10 | [
[
"LeFloch",
"Philippe G.",
""
],
[
"Rozoy",
"Luc",
""
]
] | We establish a black hole uniqueness theorem for Schwarzschild-de Sitter spacetime, also called Kottler spacetime, which satisfies Einstein's field equations of general relativity with positive cosmological constant. Our result concerns the class of static vacuum spacetimes with compact spacelike slices and regular max... |
1107.2916 | Lorenzo Iorio | Lorenzo Iorio | Perturbed stellar motions around the rotating black hole in Sgr A* for a
generic orientation of its spin axis | LaTex2e, 10 pages, 4 tables, no figures, 72 references. Sign error
corrected in Eq. (8), in the correspondence Q_2-->J_2, and in the
precessional formulas. Clarification about the mean anomaly precession added | Phys.Rev.D84:124001,2011 | 10.1103/PhysRevD.84.124001 | null | gr-qc astro-ph.GA physics.geo-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Empirically determining the averaged variations of the orbital parameters of
the stars orbiting the Supermassive Black Hole (SBH) hosted by the Galactic
Centre (GC) in Sgr A* is, in principle, a valuable tool to put on the test the
General Theory of Relativity (GTR), in regimes far stronger than those tested
so far, ... | [
{
"created": "Thu, 14 Jul 2011 08:59:09 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2011 15:24:54 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Aug 2011 14:01:54 GMT",
"version": "v3"
},
{
"created": "Wed, 9 Nov 2011 19:44:08 GMT",
"version": "v4"
},
{
"crea... | 2017-10-06 | [
[
"Iorio",
"Lorenzo",
""
]
] | Empirically determining the averaged variations of the orbital parameters of the stars orbiting the Supermassive Black Hole (SBH) hosted by the Galactic Centre (GC) in Sgr A* is, in principle, a valuable tool to put on the test the General Theory of Relativity (GTR), in regimes far stronger than those tested so far, an... |
gr-qc/0005014 | V. Guruprasad | V Guruprasad | Relativity of spatial scale and of the Hubble flow: The logical
foundations of relativity and cosmology | 8 pages | null | null | null | gr-qc | null | Formalising the logical dependence of physical quantities on material
referents of scale, I show that both Hubble's law and the cosmological constant
are in fact exactly replicable by a spatial contraction of referents locally on
earth, and that the Pioneer anomaly is irrefutable indication that this is the
case. The... | [
{
"created": "Thu, 4 May 2000 12:25:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Guruprasad",
"V",
""
]
] | Formalising the logical dependence of physical quantities on material referents of scale, I show that both Hubble's law and the cosmological constant are in fact exactly replicable by a spatial contraction of referents locally on earth, and that the Pioneer anomaly is irrefutable indication that this is the case. The f... |
2004.04878 | Gesiel Rodrigues | G. Rodrigues-da-Silva and L. G. Medeiros | Spherically Symmetric Solutions in Higher-Derivative Theories of Gravity | 10 pages, 2 tables. To incorporate the referee's comments, in this
version that matches the one published in Phys. Rev. D, we expanded the
discussion in the stability analysis, the references were updated and there
were improvements throughout the text | Phys. Rev. D 101, 124061 (2020) | 10.1103/PhysRevD.101.124061 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higher-order theories of gravity have received much attention from several
areas including quantum gravity, string theory and cosmology. This paper
proposes a higher-order gravity whose action includes all curvature scalar
terms up to the second-order corrections of general relativity, namely,
$R^{2}$, $R^{3}$ and $R... | [
{
"created": "Fri, 10 Apr 2020 01:55:49 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Apr 2020 03:11:00 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Aug 2020 15:27:13 GMT",
"version": "v3"
}
] | 2020-08-04 | [
[
"Rodrigues-da-Silva",
"G.",
""
],
[
"Medeiros",
"L. G.",
""
]
] | Higher-order theories of gravity have received much attention from several areas including quantum gravity, string theory and cosmology. This paper proposes a higher-order gravity whose action includes all curvature scalar terms up to the second-order corrections of general relativity, namely, $R^{2}$, $R^{3}$ and $R\s... |
2306.02279 | Andrzej Odrzywolek | Patryk Mach and Andrzej Odrzywo{\l}ek | Equatorial accretion on the Kerr black hole | Accepted to Acta Phys. Pol. B Proc. Suppl. Animated Fig. 1. Talk
presented at the 8th Conference of the Polish Society on Relativity (POTOR8),
19-23 September 2022, Banach Center IMPAN, Warsaw, Poland | null | null | null | gr-qc astro-ph.GA hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate stationary accretion of the collisionless Vlasov gas onto the
Kerr black hole, occurring in the equatorial plane. At infinity the gas obeys
the Maxwell-J\"{u}ttner distribution, restricted to the equatorial plane. In
the vicinity of the black hole, the motion of the gas is governed by the
spacetime geo... | [
{
"created": "Sun, 4 Jun 2023 06:56:15 GMT",
"version": "v1"
}
] | 2023-06-06 | [
[
"Mach",
"Patryk",
""
],
[
"Odrzywołek",
"Andrzej",
""
]
] | We investigate stationary accretion of the collisionless Vlasov gas onto the Kerr black hole, occurring in the equatorial plane. At infinity the gas obeys the Maxwell-J\"{u}ttner distribution, restricted to the equatorial plane. In the vicinity of the black hole, the motion of the gas is governed by the spacetime geome... |
1610.05635 | Jessie Durk | Jessie Durk, Timothy Clifton | Exact Initial Data for Black Hole Universes with a Cosmological Constant | 19 pages, 5 figures, v2: matches published version | Class. Quantum Grav. 34 (2017) 065009 | 10.1088/1361-6382/aa6064 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct exact initial data for closed cosmological models filled with
regularly arranged black holes in the presence of $\Lambda$. The intrinsic
geometry of the 3-dimensional space described by this data is a sum of simple
closed-form expressions, while the extrinsic curvature is just proportional to
$\Lambda$. ... | [
{
"created": "Tue, 18 Oct 2016 14:27:37 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2017 12:14:38 GMT",
"version": "v2"
}
] | 2017-03-15 | [
[
"Durk",
"Jessie",
""
],
[
"Clifton",
"Timothy",
""
]
] | We construct exact initial data for closed cosmological models filled with regularly arranged black holes in the presence of $\Lambda$. The intrinsic geometry of the 3-dimensional space described by this data is a sum of simple closed-form expressions, while the extrinsic curvature is just proportional to $\Lambda$. We... |
gr-qc/0502076 | Hamid Reza Sepangi | B. Vakili, S. Jalalzadeh and H. R. Sepangi | Classical and quantum spinor cosmology with signature change | 13 pages, 4 figures | JCAP 0505 (2005) 006 | 10.1088/1475-7516/2005/05/006 | null | gr-qc hep-th | null | We study the classical and quantum cosmology of a universe in which the
matter source is a massive Dirac spinor field and consider cases where such
fields are either free or self-interacting. We focus attention on the spatially
flat Robertson-Walker cosmology and classify the solutions of the
Einstein-Dirac system in... | [
{
"created": "Wed, 16 Feb 2005 16:38:21 GMT",
"version": "v1"
},
{
"created": "Sat, 14 May 2005 11:29:32 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Vakili",
"B.",
""
],
[
"Jalalzadeh",
"S.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We study the classical and quantum cosmology of a universe in which the matter source is a massive Dirac spinor field and consider cases where such fields are either free or self-interacting. We focus attention on the spatially flat Robertson-Walker cosmology and classify the solutions of the Einstein-Dirac system in t... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.