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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0103009 | Malakhaltsev Mikhail A. | V. I. Bashkov, S. M. Kozyrev | Dark matter an effect of gravitation permeability of material in Jordan,
Brance - Dicke theory | null | null | null | null | gr-qc | null | Analyzing the static spherically symmetric and rotating ellipsoid solutions
in the Newtonian limit of Jordan, Brance - Dicke theory we find the following.
In empty space scalar-tensor theories have trivial solution of field equation
with constant scalar potential (efficient value of gravitation constant). In
this cas... | [
{
"created": "Sat, 3 Mar 2001 09:32:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bashkov",
"V. I.",
""
],
[
"Kozyrev",
"S. M.",
""
]
] | Analyzing the static spherically symmetric and rotating ellipsoid solutions in the Newtonian limit of Jordan, Brance - Dicke theory we find the following. In empty space scalar-tensor theories have trivial solution of field equation with constant scalar potential (efficient value of gravitation constant). In this case ... |
1204.3433 | Jean-Philippe Bruneton | Jean-Philippe Bruneton and Julien Larena | Dynamics of a lattice Universe | 14 pages. No figure. Accepted version for Classical and Quantum
Gravity | Class.Quant.Grav. 29 (2012) 155001 | 10.1088/0264-9381/29/15/155001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find a solution to Einstein field equations for a regular toroidal lattice
of size L with equal masses M at the centre of each cell; this solution is
exact at order M/L. Such a solution is convenient to study the dynamics of an
assembly of galaxy-like objects. We find that the solution is expanding (or
contracting... | [
{
"created": "Mon, 16 Apr 2012 10:17:17 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2012 14:04:06 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Bruneton",
"Jean-Philippe",
""
],
[
"Larena",
"Julien",
""
]
] | We find a solution to Einstein field equations for a regular toroidal lattice of size L with equal masses M at the centre of each cell; this solution is exact at order M/L. Such a solution is convenient to study the dynamics of an assembly of galaxy-like objects. We find that the solution is expanding (or contracting) ... |
2005.06640 | Sebasti\'an Bahamonde Dr | Sebastian Bahamonde, Mir Faizal, James Q. Quach, Richard A. Norte | Quantum Weak Equivalence Principle and the Gravitational Casimir Effect
in Superconductors | Essay received an honorable mention in the Gravity Research
Foundation Essay Competition 2020. 9 pages, 3 figures. Matches published
version in IJMPD | Int.J.Mod.Phys.D 29 (2020), 14 | 10.1142/S0218271820430245 | null | gr-qc cond-mat.supr-con hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We will use Fisher information to properly analyze the quantum weak
equivalence principle. We argue that gravitational waves will be partially
reflected by superconductors. This will occur as the violation of the weak
equivalence principle in Cooper pairs is larger than the surrounding ionic
lattice. Such reflections... | [
{
"created": "Wed, 13 May 2020 22:03:00 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2020 13:56:02 GMT",
"version": "v2"
}
] | 2020-12-02 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Faizal",
"Mir",
""
],
[
"Quach",
"James Q.",
""
],
[
"Norte",
"Richard A.",
""
]
] | We will use Fisher information to properly analyze the quantum weak equivalence principle. We argue that gravitational waves will be partially reflected by superconductors. This will occur as the violation of the weak equivalence principle in Cooper pairs is larger than the surrounding ionic lattice. Such reflections o... |
1308.5954 | Dra\v{z}en Glavan | Drazen Glavan, Tomislav Prokopec, Vasileios Prymidis | Backreaction of a massless minimally coupled scalar field from
inflationary quantum fluctuations | null | Phys. Rev. D 89, 024024 (2014) | 10.1103/PhysRevD.89.024024 | UTP-UU-13/20, SPIN-13/14 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study a massless, minimally coupled scalar field in a FLRW
spacetime with periods of different constant deceleration parameter. We assume
the Bunch-Davies vacuum during inflation and then use a sudden matching
approximation to match it onto radiation era and subsequently onto matter era.
We then proc... | [
{
"created": "Tue, 27 Aug 2013 19:19:22 GMT",
"version": "v1"
}
] | 2014-01-29 | [
[
"Glavan",
"Drazen",
""
],
[
"Prokopec",
"Tomislav",
""
],
[
"Prymidis",
"Vasileios",
""
]
] | In this paper we study a massless, minimally coupled scalar field in a FLRW spacetime with periods of different constant deceleration parameter. We assume the Bunch-Davies vacuum during inflation and then use a sudden matching approximation to match it onto radiation era and subsequently onto matter era. We then procee... |
gr-qc/0701096 | Dejan Stojkovic | Tanmay Vachaspati and Dejan Stojkovic | Quantum Radiation from Quantum Gravitational Collapse | accepted for publication in Phys. Lett. B | Phys.Lett.B663:107-110,2008 | 10.1016/j.physletb.2008.04.004 | null | gr-qc astro-ph hep-th | null | We study quantum radiation emitted during the collapse of a quantized,
gravitating, spherical domain wall. The amount of radiation emitted during
collapse now depends on the wavefunction of the collapsing wall and the
background spacetime. If the wavefunction is initially in the form of a sharp
wavepacket, the expect... | [
{
"created": "Tue, 16 Jan 2007 21:11:04 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Apr 2008 21:58:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Vachaspati",
"Tanmay",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | We study quantum radiation emitted during the collapse of a quantized, gravitating, spherical domain wall. The amount of radiation emitted during collapse now depends on the wavefunction of the collapsing wall and the background spacetime. If the wavefunction is initially in the form of a sharp wavepacket, the expectat... |
gr-qc/0012056 | Jose Martin Garcia | Jose M. Martin-Garcia and Carsten Gundlach | Gauge-invariant and coordinate-independent perturbations of stellar
collapse II: matching to the exterior | 18 pages, RevTex | Phys.Rev.D64:024012,2001 | 10.1103/PhysRevD.64.024012 | null | gr-qc | null | In Paper I in this series we constructed evolution equations for the complete
gauge-invariant linear perturbations of a time-dependent spherically symmetric
perfect fluid spacetime. A key application of this formalism is the interior of
a collapsing star. Here we derive boundary conditions at the surface of the
star,... | [
{
"created": "Fri, 15 Dec 2000 15:54:22 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Martin-Garcia",
"Jose M.",
""
],
[
"Gundlach",
"Carsten",
""
]
] | In Paper I in this series we constructed evolution equations for the complete gauge-invariant linear perturbations of a time-dependent spherically symmetric perfect fluid spacetime. A key application of this formalism is the interior of a collapsing star. Here we derive boundary conditions at the surface of the star, m... |
2210.06810 | Guilherme Franzmann | The FADE Collaboration: Heliudson Bernardo, Benjamin Bose, Guilherme
Franzmann, Steffen Hagstotz, Yutong He, Aliki Litsa, and Florian Niedermann | Modified gravity approaches to the cosmological constant problem | 54 pages, 2 figures, 1 table. Invited review for Universe, Special
Issue "Cosmological Constant"
(https://www.mdpi.com/journal/universe/special_issues/cosmological_constant_problem) | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The cosmological constant and its phenomenology remain among the greatest
puzzles in theoretical physics. We review how modifications of Einstein's
general relativity could alleviate the different problems associated with it
that result from the interplay of classical gravity and quantum field theory.
We introduce a ... | [
{
"created": "Thu, 13 Oct 2022 07:46:58 GMT",
"version": "v1"
}
] | 2022-10-14 | [
[
"The FADE Collaboration",
"",
""
],
[
"Bernardo",
"Heliudson",
""
],
[
"Bose",
"Benjamin",
""
],
[
"Franzmann",
"Guilherme",
""
],
[
"Hagstotz",
"Steffen",
""
],
[
"He",
"Yutong",
""
],
[
"Litsa",
"Aliki",
... | The cosmological constant and its phenomenology remain among the greatest puzzles in theoretical physics. We review how modifications of Einstein's general relativity could alleviate the different problems associated with it that result from the interplay of classical gravity and quantum field theory. We introduce a mo... |
2104.14065 | Jos\'e Antonio N\'ajera | Antonio N\'ajera and Amanda Fajardo | Fitting $f(Q,T)$ gravity models with a $\Lambda$CDM limit using H(z) and
Pantheon data | V3: Accepted version in Physics of the Dark Universe. Minor changes
plus corrections in the results of the sixth model | Physics of the Dark Universe, Volume 34, December 2021, 100889 | 10.1016/j.dark.2021.100889 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We proposed five $f(Q,T)$ models, which are an extension of symmetric
teleparallel gravity, where $Q$ is the non-metricity and $T$ is the trace of
the stress-energy tensor. By taking specific values of their parameters, these
models have a $\Lambda$CDM limit.
Using cosmic chronometers and supernovae Ia data, we fou... | [
{
"created": "Thu, 29 Apr 2021 01:00:15 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jun 2021 14:31:06 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Sep 2021 19:30:16 GMT",
"version": "v3"
}
] | 2021-11-09 | [
[
"Nájera",
"Antonio",
""
],
[
"Fajardo",
"Amanda",
""
]
] | We proposed five $f(Q,T)$ models, which are an extension of symmetric teleparallel gravity, where $Q$ is the non-metricity and $T$ is the trace of the stress-energy tensor. By taking specific values of their parameters, these models have a $\Lambda$CDM limit. Using cosmic chronometers and supernovae Ia data, we found t... |
0905.3243 | Bibekananda Nayak jr | Bibekananda Nayak and Lambodar Prasad Singh | Accretion, Primordial Black Holes and Standard Cosmology | 11 pages, 3 figures | Pramana 76:173-181,2011 | 10.1007/s12043-011-0002-x | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Primordial Black Holes evaporate due to Hawking radiation. We find that the
evaporation time of primordial black holes increase when accretion of radiation
is included.Thus depending on accretion efficiency more and more number of
primordial black holes are existing today, which strengthens the idea that the
primordi... | [
{
"created": "Wed, 20 May 2009 08:33:42 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2011 06:57:03 GMT",
"version": "v2"
}
] | 2012-01-20 | [
[
"Nayak",
"Bibekananda",
""
],
[
"Singh",
"Lambodar Prasad",
""
]
] | Primordial Black Holes evaporate due to Hawking radiation. We find that the evaporation time of primordial black holes increase when accretion of radiation is included.Thus depending on accretion efficiency more and more number of primordial black holes are existing today, which strengthens the idea that the primordial... |
1808.00786 | Hans Ringstr\"om | Hans Ringstr\"om | A unified approach to the Klein-Gordon equation on Bianchi backgrounds | 47 pages | Commun. Math. Phys. 372, 599-656 (2019) | 10.1007/s00220-019-03325-7 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study solutions to the Klein-Gordon equation on Bianchi
backgrounds. In particular, we are interested in the asymptotic behaviour of
solutions in the direction of silent singularities. The main conclusion is
that, for a given solution $u$ to the Klein-Gordon equation, there are smooth
functions $u_{... | [
{
"created": "Thu, 2 Aug 2018 12:51:58 GMT",
"version": "v1"
}
] | 2020-10-15 | [
[
"Ringström",
"Hans",
""
]
] | In this paper, we study solutions to the Klein-Gordon equation on Bianchi backgrounds. In particular, we are interested in the asymptotic behaviour of solutions in the direction of silent singularities. The main conclusion is that, for a given solution $u$ to the Klein-Gordon equation, there are smooth functions $u_{i}... |
1212.0729 | Piotr Bizon | Piotr Bizo\'n and Helmut Friedrich | A remark about wave equations on the extreme Reissner-Nordstr\"om black
hole exterior | 9 pages, a sentence added to the abstract, published version | Class. Quantum Grav. 30 (2013) 065001 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a massless scalar field propagating on the exterior of the
extreme Reissner-Nordstr\"om black hole. Using a discrete conformal symmetry of
this spacetime, we draw a one-to-one relationship between the behavior of the
field near the future horizon and near future null infinity. In particular, we
show that ... | [
{
"created": "Tue, 4 Dec 2012 14:12:13 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2013 05:35:52 GMT",
"version": "v2"
}
] | 2013-02-20 | [
[
"Bizoń",
"Piotr",
""
],
[
"Friedrich",
"Helmut",
""
]
] | We consider a massless scalar field propagating on the exterior of the extreme Reissner-Nordstr\"om black hole. Using a discrete conformal symmetry of this spacetime, we draw a one-to-one relationship between the behavior of the field near the future horizon and near future null infinity. In particular, we show that th... |
gr-qc/9411039 | Massar Serge | S. Massar | The Semi-Classical Back Reaction to Black Hole Evaporation | 10 pages, LATEX | Phys.Rev.D52:5857-5864,1995 | 10.1103/PhysRevD.52.5857 | ULB-TH 94/19 | gr-qc | null | The semi-classical back reaction to black hole evaporation (wherein the
renormalized energy momentum tensor is taken as source of Einstein's equations)
is analyzed in detail. It is proven that the mass of a Schwarzshild black hole
decreases according to Hawking's law $dM/dt = - C/ M^2$ where $C$ is a constant
of orde... | [
{
"created": "Tue, 15 Nov 1994 11:41:34 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Massar",
"S.",
""
]
] | The semi-classical back reaction to black hole evaporation (wherein the renormalized energy momentum tensor is taken as source of Einstein's equations) is analyzed in detail. It is proven that the mass of a Schwarzshild black hole decreases according to Hawking's law $dM/dt = - C/ M^2$ where $C$ is a constant of order ... |
2408.03289 | Kei-Ichiro Kubota | Kei-ichiro Kubota, Shun Arai, Hayato Motohashi, and Shinji Mukohyama | Spin wave optics for gravitational waves lensed by a Kerr black hole | 17 pages, 14 figures. fixed typos | null | null | YITP-24-89, IPMU24-0031 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves exhibit the unique signature of their spin-2 nature in
processes of wave scattering, due to the interaction between spin and a
background spacetime. Since the spin effect is more pronounced for longer
wavelengths and gravitational waves sourced by binaries have a long wavelength,
it may become an ... | [
{
"created": "Tue, 6 Aug 2024 16:38:09 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Aug 2024 13:22:16 GMT",
"version": "v2"
}
] | 2024-08-08 | [
[
"Kubota",
"Kei-ichiro",
""
],
[
"Arai",
"Shun",
""
],
[
"Motohashi",
"Hayato",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | Gravitational waves exhibit the unique signature of their spin-2 nature in processes of wave scattering, due to the interaction between spin and a background spacetime. Since the spin effect is more pronounced for longer wavelengths and gravitational waves sourced by binaries have a long wavelength, it may become an im... |
gr-qc/9606074 | null | Alpan Raval, B.L. Hu and Don Koks | Near-Thermal Radiation in Detectors, Mirrors and Black Holes: A
Stochastic Approach | 27 pages, Latex | Phys.Rev.D55:4795-4812,1997 | 10.1103/PhysRevD.55.4795 | umdpp 96-53 | gr-qc hep-th | null | In analyzing the nature of thermal radiance experienced by an accelerated
observer (Unruh effect), an eternal black hole (Hawking effect) and in certain
types of cosmological expansion, one of us proposed a unifying viewpoint that
these can be understood as arising from the vacuum fluctuations of the quantum
field be... | [
{
"created": "Thu, 27 Jun 1996 02:28:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Raval",
"Alpan",
""
],
[
"Hu",
"B. L.",
""
],
[
"Koks",
"Don",
""
]
] | In analyzing the nature of thermal radiance experienced by an accelerated observer (Unruh effect), an eternal black hole (Hawking effect) and in certain types of cosmological expansion, one of us proposed a unifying viewpoint that these can be understood as arising from the vacuum fluctuations of the quantum field bein... |
1703.06626 | Boris Latosh | A.B. Arbuzov, B.N. Latosh | Fab Four self-interaction in quantum regime | 7 pages, 5 figures; minor corrections added | Arbuzov, A.B. & Latosh, B.N. Eur. Phys. J. C (2017) 77: 702 | 10.1140/epjc/s10052-017-5233-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum behavior of the John Lagrangian from the Fab Four class of Covariant
Galileons is stud- ied. We consider one-loop corrections to the John
interaction due to cubic scalar field interactions. Counter Terms are
calculated, one of them belongs to the Fab Four class, the other one to
Covariant Galileons. The role ... | [
{
"created": "Mon, 20 Mar 2017 07:42:59 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Apr 2017 16:22:44 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Latosh",
"B. N.",
""
]
] | Quantum behavior of the John Lagrangian from the Fab Four class of Covariant Galileons is stud- ied. We consider one-loop corrections to the John interaction due to cubic scalar field interactions. Counter Terms are calculated, one of them belongs to the Fab Four class, the other one to Covariant Galileons. The role of... |
2307.04151 | Raihaneh Moti | Raihaneh Moti and Ali Shojai | On the Gravitational Precession Memory Effect for an Ensemble of
Gyroscopes | 23 pages, 9 figures, 1 table | null | 10.1088/1361-6382/ad1780 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamic properties of a freely falling ensemble of
gyroscopes after the passage of a weak gravitational wave. Due to the
precession memory effect, the thermodynamic quantities will experience a change
because of the space-time perturbation. We discuss that this GravoThermo memory
effect potentially... | [
{
"created": "Sun, 9 Jul 2023 10:58:36 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Aug 2023 15:35:32 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Nov 2023 06:00:36 GMT",
"version": "v3"
}
] | 2024-01-05 | [
[
"Moti",
"Raihaneh",
""
],
[
"Shojai",
"Ali",
""
]
] | We study the thermodynamic properties of a freely falling ensemble of gyroscopes after the passage of a weak gravitational wave. Due to the precession memory effect, the thermodynamic quantities will experience a change because of the space-time perturbation. We discuss that this GravoThermo memory effect potentially c... |
2007.02309 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou, F.P. Fronimos | Non-Minimally Coupled Einstein Gauss Bonnet Inflation Phenomenology in
View of GW170817 | AoP Accepted | null | 10.1016/j.aop.2020.168250 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the inflationary phenomenology of a non-minimally coupled Einstein
Gauss-Bonnet gravity theory, in the presence of a scalar potential, under the
condition that the gravitational wave speed of the primordial gravitational
waves is equal to unity, that is $c_T^2=1$, in natural units. The equations of
motion, w... | [
{
"created": "Sun, 5 Jul 2020 12:23:38 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Fronimos",
"F. P.",
""
]
] | We study the inflationary phenomenology of a non-minimally coupled Einstein Gauss-Bonnet gravity theory, in the presence of a scalar potential, under the condition that the gravitational wave speed of the primordial gravitational waves is equal to unity, that is $c_T^2=1$, in natural units. The equations of motion, whi... |
1703.01724 | B. S. Ratanpal | S. K. Maurya, B. S. Ratanpal and M. Govender | Anisotropic stars for spherically symmetric spacetimes satisfying the
Karmarkar condition | null | Annals of Physics, 382, (2017), 36-49 | 10.1016/j.aop.2017.04.008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new class of solution describing an anisotropic stellar configuration
satisfying Karmarkar's condition i.e. spherically symmetric metric of embedding
class 1, is reported. It has been shown that the compact star model is
physically well-behaved and meet all the physical requirements for a stable
configuration in hy... | [
{
"created": "Mon, 6 Mar 2017 04:52:34 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2017 16:22:51 GMT",
"version": "v2"
}
] | 2017-05-24 | [
[
"Maurya",
"S. K.",
""
],
[
"Ratanpal",
"B. S.",
""
],
[
"Govender",
"M.",
""
]
] | A new class of solution describing an anisotropic stellar configuration satisfying Karmarkar's condition i.e. spherically symmetric metric of embedding class 1, is reported. It has been shown that the compact star model is physically well-behaved and meet all the physical requirements for a stable configuration in hydr... |
2210.05281 | Fabian L\'aszl\'o Konstantin Wagner | Fabian Wagner | Modified uncertainty relations from classical and quantum gravity | PhD thesis containing an extensive literature on GUPs and EUPs.
110+10+44 pages. Based on publications arXiv:1905.09713, arXiv:2006.02188,
arXiv:2101.05552, arXiv:2110.11067, arXiv:2111.15583 and arXiv:2112.06758 | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A good hundred years after the necessity for a quantum theory of gravity was
acknowledged by Albert Einstein, the search for it continues to be an ongoing
endeavour. Nevertheless, the field still evolves rapidly as manifested by the
recent rise of quantum gravity phenomenology supported by an enormous surge in
experi... | [
{
"created": "Tue, 11 Oct 2022 09:26:23 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Wagner",
"Fabian",
""
]
] | A good hundred years after the necessity for a quantum theory of gravity was acknowledged by Albert Einstein, the search for it continues to be an ongoing endeavour. Nevertheless, the field still evolves rapidly as manifested by the recent rise of quantum gravity phenomenology supported by an enormous surge in experime... |
gr-qc/9909059 | Stuart L. Shapiro | Stuart L. Shapiro | Brief Comments on ``The Shapiro Conjecture, Prompt or Delayed Collapse
?'' by Miller, Suen and Tobias | 3 pages | null | null | null | gr-qc astro-ph | null | Recent numerical simulations address a conjecture by Shapiro that when two
neutron stars collide head-on from rest at infinity, sufficient thermal
pressure may be generated to support the hot remnant in quasi-static
equilibrium against collapse prior to neutrino cooling. The conjecture is meant
to apply even when the... | [
{
"created": "Mon, 20 Sep 1999 16:38:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shapiro",
"Stuart L.",
""
]
] | Recent numerical simulations address a conjecture by Shapiro that when two neutron stars collide head-on from rest at infinity, sufficient thermal pressure may be generated to support the hot remnant in quasi-static equilibrium against collapse prior to neutrino cooling. The conjecture is meant to apply even when the t... |
1601.04395 | Jian-Liang Liu | Jian-Liang Liu and Luen-Fai Tam | Quasilocal Energy in Kerr Spacetime | There are some contents added in section 4 and also some refinement
on abstract and introduction | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the quasilocal energy as in [11] for a constant radius
surface in Kerr spacetime in Boyer-Lindquist coordinates. We show that under
suitable conditions for isometric embedding, for a stationary observer the
quasilocal energy defined in [11] for constant radius in a Kerr like spacetime
is exactly... | [
{
"created": "Mon, 18 Jan 2016 03:53:59 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2016 06:01:13 GMT",
"version": "v2"
}
] | 2016-02-08 | [
[
"Liu",
"Jian-Liang",
""
],
[
"Tam",
"Luen-Fai",
""
]
] | In this work we study the quasilocal energy as in [11] for a constant radius surface in Kerr spacetime in Boyer-Lindquist coordinates. We show that under suitable conditions for isometric embedding, for a stationary observer the quasilocal energy defined in [11] for constant radius in a Kerr like spacetime is exactly e... |
1703.10282 | Maxim Eingorn | Ruslan Brilenkov and Maxim Eingorn | Second-order Cosmological Perturbations Engendered by Point-like Masses | v2 = v1 + minor changes + extra discussion + new Refs.; comments
welcome | ApJ 845, 153 (2017) | 10.3847/1538-4357/aa81cd | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the $\Lambda$CDM framework, presenting nonrelativistic matter
inhomogeneities as discrete massive particles, we develop the second-order
cosmological perturbation theory. Our approach relies on the weak gravitational
field limit. The derived equations for the second-order scalar, vector and
tensor metric correctio... | [
{
"created": "Thu, 30 Mar 2017 01:19:37 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2017 15:05:17 GMT",
"version": "v2"
}
] | 2017-09-11 | [
[
"Brilenkov",
"Ruslan",
""
],
[
"Eingorn",
"Maxim",
""
]
] | In the $\Lambda$CDM framework, presenting nonrelativistic matter inhomogeneities as discrete massive particles, we develop the second-order cosmological perturbation theory. Our approach relies on the weak gravitational field limit. The derived equations for the second-order scalar, vector and tensor metric corrections... |
1402.4291 | Sudipta Das | Sudipta Das, Abdulla Al Mamon | An Interacting model of Dark Energy in Brans-Dicke theory | 12 pages, 15 figures. Accepted for publication in Astrophysics and
Space Science | null | 10.1007/s10509-014-1856-4 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it is shown that in non-minimally coupled Brans-Dicke theory
containing a self-interacting potential, a suitable conformal transformation
can automatically give rise to an interaction between the normal matter and the
Brans-Dicke scalar field. Considering the scalar field in the Einstein frame as
the qu... | [
{
"created": "Tue, 18 Feb 2014 11:09:48 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Das",
"Sudipta",
""
],
[
"Mamon",
"Abdulla Al",
""
]
] | In this paper it is shown that in non-minimally coupled Brans-Dicke theory containing a self-interacting potential, a suitable conformal transformation can automatically give rise to an interaction between the normal matter and the Brans-Dicke scalar field. Considering the scalar field in the Einstein frame as the quin... |
gr-qc/0606119 | Mauricio Bellini | Agustin Membiela (Mar del Plata University), Mauricio Bellini (Mar del
Plata University & CONICET) | Quintessential inflation from a variable cosmological constant in a 5D
vacuum | final version (figure included) | Phys.Lett.B641:125-129,2006 | 10.1016/j.physletb.2006.08.043 | null | gr-qc | null | We explore an effective 4D cosmological model for the universe where the
variable cosmological constant governs its evolution and the pressure remains
negative along all the expansion. This model is introduced from a 5D vacuum
state where the (space-like) extra coordinate is considered as noncompact. The
expansion is... | [
{
"created": "Wed, 28 Jun 2006 15:54:12 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Sep 2006 15:19:05 GMT",
"version": "v2"
},
{
"created": "Wed, 16 May 2007 22:02:19 GMT",
"version": "v3"
}
] | 2010-03-26 | [
[
"Membiela",
"Agustin",
"",
"Mar del Plata University"
],
[
"Bellini",
"Mauricio",
"",
"Mar del\n Plata University & CONICET"
]
] | We explore an effective 4D cosmological model for the universe where the variable cosmological constant governs its evolution and the pressure remains negative along all the expansion. This model is introduced from a 5D vacuum state where the (space-like) extra coordinate is considered as noncompact. The expansion is p... |
1601.05652 | Pekka Teerikorpi | Pekka Teerikorpi and Yurij Baryshev | Mattig's relation and dynamical distance indicators | 3 pages, 0 figures | null | 10.1002/asna.201512307 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how the redshift (Mattig) method in Friedmann cosmology relates to
dynamical distance indicators based on Newton's gravity (Teerikorpi 2011). It
belongs to the class of indicators where the relevant length inside the system
is the distance itself (in this case the proper metric distance). As the
Friedmann ... | [
{
"created": "Thu, 21 Jan 2016 14:24:16 GMT",
"version": "v1"
}
] | 2016-03-16 | [
[
"Teerikorpi",
"Pekka",
""
],
[
"Baryshev",
"Yurij",
""
]
] | We discuss how the redshift (Mattig) method in Friedmann cosmology relates to dynamical distance indicators based on Newton's gravity (Teerikorpi 2011). It belongs to the class of indicators where the relevant length inside the system is the distance itself (in this case the proper metric distance). As the Friedmann mo... |
gr-qc/9506028 | Junichi Iwasaki | Junichi Iwasaki | Woven Geometries: Black Holes | latex 10 pages, 1 epsfig figures, University of Pittsburgh preprint | null | null | null | gr-qc | null | Tangles of loops which approximate an aspect of the Kerr-Newman black hole
metrics at large scales compared to the Planck length are constructed. The
physical aspect the tangles approximate is discussed. This construction may be
useful in the loop representation of canonical quantum gravity. Implications
and applicat... | [
{
"created": "Fri, 16 Jun 1995 00:58:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Iwasaki",
"Junichi",
""
]
] | Tangles of loops which approximate an aspect of the Kerr-Newman black hole metrics at large scales compared to the Planck length are constructed. The physical aspect the tangles approximate is discussed. This construction may be useful in the loop representation of canonical quantum gravity. Implications and applicatio... |
2108.12698 | Daniil Krichevskiy | Valentin Rudenko, Svetlana Andrusenko, Daniil Krichevskiy, Gevorg
Manucharyan | Optimization of the Euro-Asian network of gravitational detectors for
detecting the radiation of collapsing objects | arXiv admin note: substantial text overlap with arXiv:2009.05860 | null | 10.1088/1742-6596/2081/1/012011 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A Euro-Asian network of four gravitational-wave (GW) interferometers is
considered, taking into account the plan to create such a detector in
Novosibirsk. The efficiency of the network is assessed by typical numerical
criteria, which also depend on the characteristics of the received signal. In
this work, we calculat... | [
{
"created": "Sat, 28 Aug 2021 19:37:04 GMT",
"version": "v1"
}
] | 2021-12-08 | [
[
"Rudenko",
"Valentin",
""
],
[
"Andrusenko",
"Svetlana",
""
],
[
"Krichevskiy",
"Daniil",
""
],
[
"Manucharyan",
"Gevorg",
""
]
] | A Euro-Asian network of four gravitational-wave (GW) interferometers is considered, taking into account the plan to create such a detector in Novosibirsk. The efficiency of the network is assessed by typical numerical criteria, which also depend on the characteristics of the received signal. In this work, we calculate ... |
gr-qc/0111075 | Zhang Chengmin | C.M. Zhang and A. Beesham | Rotation intrinsic spin coupling--the parallelism description | 10 pages, no figure | Mod.Phys.Lett.A16:2319-2326,2001 | 10.1142/S0217732301005886 | null | gr-qc | null | For the Dirac particle in the rotational system, the rotation induced inertia
effect is analogously treated as the modification of the "spin connection" on
the Dirac equation in the flat spacetime, which is determined by the equivalent
tetrad. From the point of view of parallelism description of spacetime, the
obtain... | [
{
"created": "Thu, 22 Nov 2001 10:23:14 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Zhang",
"C. M.",
""
],
[
"Beesham",
"A.",
""
]
] | For the Dirac particle in the rotational system, the rotation induced inertia effect is analogously treated as the modification of the "spin connection" on the Dirac equation in the flat spacetime, which is determined by the equivalent tetrad. From the point of view of parallelism description of spacetime, the obtained... |
gr-qc/9907071 | Jose Luis Jaramillo | V. Aldaya and J.L. Jaramillo | Space-time Structures from Critical Values in 2D Quantum Gravity | 22 pages, latex, no figures. Revised version with an effort in the
development of the underlying classical theory and the clarification of the
classical limit. To appear in Class. Quant. Grav | Class.Quant.Grav. 17 (2000) 1649-1666 | 10.1088/0264-9381/17/7/306 | null | gr-qc | null | A model for 2D Quantum Gravity is constructed out of the Virasoro group. To
this end the quantization of the abstract Virasoro group is revisited. For the
critical values of the conformal anomaly c, some quantum operators (SL(2,R)
generators) lose their dynamical content (they are no longer conjugated
operators). The... | [
{
"created": "Thu, 22 Jul 1999 16:00:09 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jan 2000 17:41:50 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Aldaya",
"V.",
""
],
[
"Jaramillo",
"J. L.",
""
]
] | A model for 2D Quantum Gravity is constructed out of the Virasoro group. To this end the quantization of the abstract Virasoro group is revisited. For the critical values of the conformal anomaly c, some quantum operators (SL(2,R) generators) lose their dynamical content (they are no longer conjugated operators). The n... |
1101.1459 | Ian Harry | Ian Harry, Stephen Fairhurst | A coherent triggered search for single spin compact binary coalescences
in gravitational wave data | 14 pages, 4 figures | Class.Quant.Grav. 28 (2011) 134008 | 10.1088/0264-9381/28/13/134008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a method for conducting a coherent search for single
spin compact binary coalescences in gravitational wave data and compare this
search to the existing coincidence method for single spin searches. We propose
a method to characterize the regions of the parameter space where the single
spin se... | [
{
"created": "Fri, 7 Jan 2011 15:55:55 GMT",
"version": "v1"
}
] | 2014-05-21 | [
[
"Harry",
"Ian",
""
],
[
"Fairhurst",
"Stephen",
""
]
] | In this paper we present a method for conducting a coherent search for single spin compact binary coalescences in gravitational wave data and compare this search to the existing coincidence method for single spin searches. We propose a method to characterize the regions of the parameter space where the single spin sear... |
2402.14893 | Vasiliy P. Neznamov | V.P.Neznamov, S.Yu.Sedov, V.E.Shemarulin | The Quantum Model of Spinning Black Holes | 15 pages, 2 figures, 1 table | Int.J. Mod. Phys. A (2024) 2450012 | 10.1142/S0217751X2450012X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a quantum model of spinning black holes with the integrable ring
singularities. For the charged Kerr-Newman quantum metric, the complete
regularization takes place at fixing of the maximal (cut-off) energy of
gravitons, $k_{UV}^{reg} = \hbar c/R_{S}^{reg}$.The domains of existence of
one, two and several e... | [
{
"created": "Thu, 22 Feb 2024 15:27:43 GMT",
"version": "v1"
}
] | 2024-02-26 | [
[
"Neznamov",
"V. P.",
""
],
[
"Sedov",
"S. Yu.",
""
],
[
"Shemarulin",
"V. E.",
""
]
] | We propose a quantum model of spinning black holes with the integrable ring singularities. For the charged Kerr-Newman quantum metric, the complete regularization takes place at fixing of the maximal (cut-off) energy of gravitons, $k_{UV}^{reg} = \hbar c/R_{S}^{reg}$.The domains of existence of one, two and several eve... |
0811.2877 | Carlos A. R. Herdeiro | G. W. Gibbons, C. A. R. Herdeiro, C. M. Warnick and M. C. Werner | Stationary Metrics and Optical Zermelo-Randers-Finsler Geometry | 37 pages, 6 figures | Phys.Rev.D79:044022,2009 | 10.1103/PhysRevD.79.044022 | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a triality between the Zermelo navigation problem, the geodesic
flow on a Finslerian geometry of Randers type, and spacetimes in one dimension
higher admitting a timelike conformal Killing vector field. From the latter
viewpoint, the data of the Zermelo problem are encoded in a (conformally)
Painleve-Gull... | [
{
"created": "Tue, 18 Nov 2008 10:32:57 GMT",
"version": "v1"
}
] | 2009-05-05 | [
[
"Gibbons",
"G. W.",
""
],
[
"Herdeiro",
"C. A. R.",
""
],
[
"Warnick",
"C. M.",
""
],
[
"Werner",
"M. C.",
""
]
] | We consider a triality between the Zermelo navigation problem, the geodesic flow on a Finslerian geometry of Randers type, and spacetimes in one dimension higher admitting a timelike conformal Killing vector field. From the latter viewpoint, the data of the Zermelo problem are encoded in a (conformally) Painleve-Gullst... |
1703.04579 | Mark D. Roberts | Mark D. Roberts | Quantum Imploding Scalar Fields | 12 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The d'Alembertian $\Box\phi=0$ has solution $\phi=f(v)/r$, where $f$ is a
function of a null coordinate $v$, and this allows creation of a divergent
singularity out of nothing. In scalar-Einstein theory a similar situation
arises both for the scalar field and also for curvature invariants such as the
Ricci scalar. He... | [
{
"created": "Wed, 15 Mar 2017 15:00:24 GMT",
"version": "v1"
}
] | 2017-03-16 | [
[
"Roberts",
"Mark D.",
""
]
] | The d'Alembertian $\Box\phi=0$ has solution $\phi=f(v)/r$, where $f$ is a function of a null coordinate $v$, and this allows creation of a divergent singularity out of nothing. In scalar-Einstein theory a similar situation arises both for the scalar field and also for curvature invariants such as the Ricci scalar. Here... |
2012.10213 | Quentin Vigneron | Quentin Vigneron | The 1+3-Newton-Cartan system and Newton-Cartan cosmology | Accepted for publication in Physical Review D; 11 pages; 1 figure | Phys. Rev. D 103, 064064 (2021) | 10.1103/PhysRevD.103.064064 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We perform a covariant 1+3 split of the Newton-Cartan equations. The
resulting 3-dimensional system of equations, called \textit{the
1+3-Newton-Cartan equations}, is structurally equivalent to the 1+3-Einstein
equations. In particular it features the momentum constraint, and a choice of
adapted coordinates correspond... | [
{
"created": "Fri, 18 Dec 2020 13:16:54 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Mar 2021 12:22:03 GMT",
"version": "v2"
}
] | 2021-03-31 | [
[
"Vigneron",
"Quentin",
""
]
] | We perform a covariant 1+3 split of the Newton-Cartan equations. The resulting 3-dimensional system of equations, called \textit{the 1+3-Newton-Cartan equations}, is structurally equivalent to the 1+3-Einstein equations. In particular it features the momentum constraint, and a choice of adapted coordinates corresponds ... |
1604.08129 | Javier Olmedo | Javier Olmedo | Evolution in totally constrained models: Schr\"odinger vs. Heisenberg
pictures | 18 pages, minor corrections have been incorporated | International Journal of Modern Physics D, 1642004 (2016) | 10.1142/S0218271816420049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the relation between two evolution pictures that are currently
considered for totally constrained theories. Both descriptions are based on
Rovelli's evolving constants approach, where one identifies a (possibly local)
degree of freedom of the system as an internal time. This method is well
understood classic... | [
{
"created": "Wed, 27 Apr 2016 16:19:10 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2016 17:09:35 GMT",
"version": "v2"
}
] | 2016-06-22 | [
[
"Olmedo",
"Javier",
""
]
] | We study the relation between two evolution pictures that are currently considered for totally constrained theories. Both descriptions are based on Rovelli's evolving constants approach, where one identifies a (possibly local) degree of freedom of the system as an internal time. This method is well understood classical... |
1405.2899 | Francisco Frutos-Alfaro Dr. rer. nat. | Paulo Montero-Camacho, Francisco Frutos-Alfaro, Carlos
Gutierrez-Chaves | Slowly rotating Curzon-Chazy Metric | null | Revista de Matem\'atica: Teor\'ia y Aplicaciones, 22 (2): 265-274,
2015 | 10.15517/rmta.v22i2.20833 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new rotation version of the Curzon-Chazy metric is found. This new metric
was obtained by means of a perturbation method, in order to include slow
rotation. The solution is then proved to fulfill the Einstein field equations
using a REDUCE program. Furthermore, the applications of this new solution are
discussed.
| [
{
"created": "Sat, 10 May 2014 01:53:05 GMT",
"version": "v1"
},
{
"created": "Tue, 27 May 2014 02:57:51 GMT",
"version": "v2"
},
{
"created": "Sun, 17 Jul 2016 01:38:41 GMT",
"version": "v3"
}
] | 2016-07-20 | [
[
"Montero-Camacho",
"Paulo",
""
],
[
"Frutos-Alfaro",
"Francisco",
""
],
[
"Gutierrez-Chaves",
"Carlos",
""
]
] | A new rotation version of the Curzon-Chazy metric is found. This new metric was obtained by means of a perturbation method, in order to include slow rotation. The solution is then proved to fulfill the Einstein field equations using a REDUCE program. Furthermore, the applications of this new solution are discussed. |
gr-qc/0302094 | Roy Maartens | John D Barrow (1), George Ellis (2), Roy Maartens (3), Christos Tsagas
(2) ((1) Cambridge, (2) Cape Town, (3) Portsmouth) | On the Stability of the Einstein Static Universe | some additional comments and references; version to appear in Class.
Quant. Grav | Class.Quant.Grav.20:L155-L164,2003 | 10.1088/0264-9381/20/11/102 | null | gr-qc astro-ph | null | We show using covariant techniques that the Einstein static universe
containing a perfect fluid is always neutrally stable against small
inhomogeneous vector and tensor perturbations and neutrally stable against
adiabatic scalar density inhomogeneities so long as c_{s}^2>1/5, and unstable
otherwise. We also show that... | [
{
"created": "Mon, 24 Feb 2003 15:39:23 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2003 09:36:49 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Barrow",
"John D",
"",
"Cambridge"
],
[
"Ellis",
"George",
"",
"Cape Town"
],
[
"Maartens",
"Roy",
"",
"Portsmouth"
],
[
"Tsagas",
"Christos",
"",
"Cape Town"
]
] | We show using covariant techniques that the Einstein static universe containing a perfect fluid is always neutrally stable against small inhomogeneous vector and tensor perturbations and neutrally stable against adiabatic scalar density inhomogeneities so long as c_{s}^2>1/5, and unstable otherwise. We also show that t... |
2101.11798 | Tousif Islam | Tousif Islam, Vijay Varma, Jackie Lodman, Scott E. Field, Gaurav
Khanna, Mark A. Scheel, Harald P. Pfeiffer, Davide Gerosa, and Lawrence E.
Kidder | Eccentric binary black hole surrogate models for the gravitational
waveform and remnant properties: comparable mass, nonspinning case | 19 pages, 15 figures | Phys. Rev. D 103, 064022 (2021) | 10.1103/PhysRevD.103.064022 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We develop new strategies to build numerical relativity surrogate models for
eccentric binary black hole systems, which are expected to play an increasingly
important role in current and future gravitational-wave detectors. We introduce
a new surrogate waveform model, \texttt{NRSur2dq1Ecc}, using 47 nonspinning,
equa... | [
{
"created": "Thu, 28 Jan 2021 03:25:19 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Mar 2021 19:23:18 GMT",
"version": "v2"
}
] | 2021-03-26 | [
[
"Islam",
"Tousif",
""
],
[
"Varma",
"Vijay",
""
],
[
"Lodman",
"Jackie",
""
],
[
"Field",
"Scott E.",
""
],
[
"Khanna",
"Gaurav",
""
],
[
"Scheel",
"Mark A.",
""
],
[
"Pfeiffer",
"Harald P.",
""
],
[
... | We develop new strategies to build numerical relativity surrogate models for eccentric binary black hole systems, which are expected to play an increasingly important role in current and future gravitational-wave detectors. We introduce a new surrogate waveform model, \texttt{NRSur2dq1Ecc}, using 47 nonspinning, equal-... |
gr-qc/0410096 | Zuyao Sun | Zu-Yao Sun, You-Gen Shen | Phantom Cosmology with Non-minimally Coupled Real Scalar Field | 12 pages, 2 figures. Accepted for publication in Gen.Rel.Grav | Gen.Rel.Grav.37:243-251,2005 | 10.1007/s10714-005-0014-2 | null | gr-qc | null | We find that the expansion of the universe is accelerating by analyzing the
recent observation data of type $\textsc{I}a$ supernova(SN-Ia) .It indicates
that the equation of state of the dark energy might be smaller than -1,which
leads to the introduction of phantom models featured by its negative kinetic
energy to a... | [
{
"created": "Wed, 20 Oct 2004 16:18:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sun",
"Zu-Yao",
""
],
[
"Shen",
"You-Gen",
""
]
] | We find that the expansion of the universe is accelerating by analyzing the recent observation data of type $\textsc{I}a$ supernova(SN-Ia) .It indicates that the equation of state of the dark energy might be smaller than -1,which leads to the introduction of phantom models featured by its negative kinetic energy to acc... |
1701.07420 | Patrick Wong | Patrick J. Wong | Shape Dynamical Loop Gravity from a Conformal Immirzi Parameter | 17 pages, published version | Int. J. Mod. Phys. D 26, 1750131 (2017) | 10.1142/S0218271817501310 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Immirzi parameter of loop quantum gravity is a one parameter ambiguity of
the theory whose precise interpretation is not universally agreed upon. It is
an inherent characteristic of the quantum theory as it appears in the spectra
of geometric operators, despite being irrelevant at the classical level. The
paramet... | [
{
"created": "Wed, 25 Jan 2017 18:45:21 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2017 07:28:34 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"Wong",
"Patrick J.",
""
]
] | The Immirzi parameter of loop quantum gravity is a one parameter ambiguity of the theory whose precise interpretation is not universally agreed upon. It is an inherent characteristic of the quantum theory as it appears in the spectra of geometric operators, despite being irrelevant at the classical level. The parameter... |
2002.01148 | Zhie Liu | Zhi-E Liu, Xia Tan, Yu-Zhen Liu, Bei Sha, Jie Zhang, Shu-Zheng Yang | Lorentz symmetry violation and the tunneling radiation of fermions with
spin $1/2$ for Kerr Anti-de-Sitter black hole | 12 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied the correction of the quantum tunneling radiation of fermions with
spin $1/2$ in Kerr Anti-de-Sitter black hole. First, the dynamic equation of
spin $1/2$ fermions was corrected using Lorentz's violation theory. Second, the
new expressions of the fermions quantum tunneling rate, the Hawking temperature
of ... | [
{
"created": "Tue, 4 Feb 2020 06:38:02 GMT",
"version": "v1"
}
] | 2020-02-05 | [
[
"Liu",
"Zhi-E",
""
],
[
"Tan",
"Xia",
""
],
[
"Liu",
"Yu-Zhen",
""
],
[
"Sha",
"Bei",
""
],
[
"Zhang",
"Jie",
""
],
[
"Yang",
"Shu-Zheng",
""
]
] | We studied the correction of the quantum tunneling radiation of fermions with spin $1/2$ in Kerr Anti-de-Sitter black hole. First, the dynamic equation of spin $1/2$ fermions was corrected using Lorentz's violation theory. Second, the new expressions of the fermions quantum tunneling rate, the Hawking temperature of th... |
0810.0468 | Alexander Shatskiy Dr. | Alexander Shatskiy, I.D. Novikov, N.S. Kardashev | New analytic models of traversable wormholes | 15 pages, 2 figures | Phys.Usp.51:457-464,2008 | 10.1070/PU2008v051n05ABEH006581 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analytic solution of the general relativity equations for spherically
symmetric wormholes are given. We investigate the special case of a
"traversable" wormhole i.e., one allowing the signal to pass through it. The
energy-momentum tensor of wormhole matter is represented as a superposition of
a spherically symmet... | [
{
"created": "Thu, 2 Oct 2008 16:23:50 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Shatskiy",
"Alexander",
""
],
[
"Novikov",
"I. D.",
""
],
[
"Kardashev",
"N. S.",
""
]
] | The analytic solution of the general relativity equations for spherically symmetric wormholes are given. We investigate the special case of a "traversable" wormhole i.e., one allowing the signal to pass through it. The energy-momentum tensor of wormhole matter is represented as a superposition of a spherically symmetri... |
1511.03530 | Christof Wetterich | C. Wetterich | Primordial cosmic fluctuations for variable gravity | new reference, small changes in text | null | 10.1088/1475-7516/2016/05/041 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observability of primordial cosmic fluctuations does not require a
geometric horizon $H^{-1}$, which is exceeded temporarily by the wavelength of
fluctuations. The primordial information can be protected against later thermal
washout even if all relevant wavelengths remain smaller than $H^{-1}$. This is
demonstra... | [
{
"created": "Wed, 11 Nov 2015 15:23:39 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Dec 2015 13:01:28 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Wetterich",
"C.",
""
]
] | The observability of primordial cosmic fluctuations does not require a geometric horizon $H^{-1}$, which is exceeded temporarily by the wavelength of fluctuations. The primordial information can be protected against later thermal washout even if all relevant wavelengths remain smaller than $H^{-1}$. This is demonstrate... |
gr-qc/0508090 | Hamid Reza Sepangi | B. Vakili and H. R. Sepangi | Bianchi-I classical and quantum spinor cosmology with signature change | 11 pages, 1 figure | JCAP 0509 (2005) 008 | 10.1088/1475-7516/2005/09/008 | null | gr-qc hep-th | null | We study the classical and quantum evolution of a universe in which the
matter source is a massive Dirac spinor field and the universe is described by
a Bianchi type I metric. We focus attention on those classical solutions that
admit a degenerate metric in which the scale factors have smooth behavior in
transition f... | [
{
"created": "Sun, 21 Aug 2005 11:01:10 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Sep 2005 04:13:22 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Vakili",
"B.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We study the classical and quantum evolution of a universe in which the matter source is a massive Dirac spinor field and the universe is described by a Bianchi type I metric. We focus attention on those classical solutions that admit a degenerate metric in which the scale factors have smooth behavior in transition fro... |
2011.15070 | Emmanuil Saridakis | W. El Hanafy and Emmanuel N. Saridakis | $f(T)$ cosmology: From Pseudo-Bang to Pseudo-Rip | 32 pages, 8 figures, 1 table, version published in JCAP | JCAP 09 (2021) 019 | 10.1088/1475-7516/2021/09/019 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the complete universe evolution in the framework of $f(T)$
cosmology. We first study the requirements at the kinematic level and we
introduce a simple scale factor with the necessary features. Performing a
detailed analysis of the phase portrait we show that the universe begins in the
infinite past fro... | [
{
"created": "Mon, 30 Nov 2020 18:08:26 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Sep 2021 17:51:49 GMT",
"version": "v2"
}
] | 2021-09-16 | [
[
"Hanafy",
"W. El",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the complete universe evolution in the framework of $f(T)$ cosmology. We first study the requirements at the kinematic level and we introduce a simple scale factor with the necessary features. Performing a detailed analysis of the phase portrait we show that the universe begins in the infinite past from ... |
gr-qc/9411072 | Luis Octavio Pimentel | Pimentel L O and Obregon O | Quantum Cosmology for a Quadratic Theory of Gravity | 13 pages, latex,no figures | Class.Quant.Grav.11:2219-2223,1994; ERRATUM-ibid.11:2833,1994 | 10.1088/0264-9381/11/9/007 | UAMI-AG-940021 | gr-qc | null | For pure fourth order (${\cal{L}} \propto R^2$) quantum cosmology the
Wheeler-DeWitt equation is solved exactly for the closed homogeneous and
isotropic model. It is shown that by imposing as boundary condition that $\Psi
= 0$ at the origin of the universe the wave functions behave as suggested by
Vilenkin.
| [
{
"created": "Tue, 29 Nov 1994 21:46:23 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"O",
"Pimentel L",
""
],
[
"O",
"Obregon",
""
]
] | For pure fourth order (${\cal{L}} \propto R^2$) quantum cosmology the Wheeler-DeWitt equation is solved exactly for the closed homogeneous and isotropic model. It is shown that by imposing as boundary condition that $\Psi = 0$ at the origin of the universe the wave functions behave as suggested by Vilenkin. |
2208.11906 | Chi-Yong Lin | Chen-Yu Wang, Da-Shin Lee, and Chi-Yong Lin | Null and time-like geodesics in Kerr-Newman black hole exterior | 50 pages, 18 figures | null | 10.1103/PhysRevD.106.084048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the null and time-like geodesics of the light and the neutral
particles respectively in the exterior of Kerr-Newman black holes. The geodesic
equations are known to be written as a set of first-order differential
equations in Mino time from which the angular and radial potentials can be
defined. We classify ... | [
{
"created": "Thu, 25 Aug 2022 07:41:06 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Wang",
"Chen-Yu",
""
],
[
"Lee",
"Da-Shin",
""
],
[
"Lin",
"Chi-Yong",
""
]
] | We study the null and time-like geodesics of the light and the neutral particles respectively in the exterior of Kerr-Newman black holes. The geodesic equations are known to be written as a set of first-order differential equations in Mino time from which the angular and radial potentials can be defined. We classify th... |
1803.03271 | Christopher Moore | Vitor Cardoso, Taishi Ikeda, Christopher J. Moore, and Chul-Moon Yoo | Remarks on the maximum luminosity | 10 pages (including appendices), 4 figures, 1 table, submitted to
Phys. Rev. D | Phys. Rev. D 97, 084013 (2018) | 10.1103/PhysRevD.97.084013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quest for fundamental limitations on physical processes is old and
venerable. Here, we investigate the maximum possible power, or luminosity, that
any event can produce. We show, via full nonlinear simulations of Einstein's
equations, that there exist initial conditions which give rise to arbitrarily
large lumino... | [
{
"created": "Thu, 8 Mar 2018 19:00:08 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2018 13:56:11 GMT",
"version": "v2"
}
] | 2018-04-12 | [
[
"Cardoso",
"Vitor",
""
],
[
"Ikeda",
"Taishi",
""
],
[
"Moore",
"Christopher J.",
""
],
[
"Yoo",
"Chul-Moon",
""
]
] | The quest for fundamental limitations on physical processes is old and venerable. Here, we investigate the maximum possible power, or luminosity, that any event can produce. We show, via full nonlinear simulations of Einstein's equations, that there exist initial conditions which give rise to arbitrarily large luminosi... |
0709.3465 | Tim Koslowski A | Tim A. Koslowski | Dynamical Quantum Geometry (DQG Programme) | 19 pages, LaTeX, 3 figures | null | null | null | gr-qc | null | In this brief note (written as a lengthy letter), we describe the
construction of a representation for the Weyl-algebra underlying Loop Quantum
Geometry constructed from a diffeomorphism variant state, which corresponds to
a ''condensate'' of Loop Quantum Geometry, resembling a static spatial
geometry. We present the... | [
{
"created": "Fri, 21 Sep 2007 15:59:06 GMT",
"version": "v1"
}
] | 2007-09-24 | [
[
"Koslowski",
"Tim A.",
""
]
] | In this brief note (written as a lengthy letter), we describe the construction of a representation for the Weyl-algebra underlying Loop Quantum Geometry constructed from a diffeomorphism variant state, which corresponds to a ''condensate'' of Loop Quantum Geometry, resembling a static spatial geometry. We present the k... |
gr-qc/0207087 | Dr Henk van Elst | Henk van Elst and Reza Tavakol | BritGravII - The Second British Gravity Meeting | 13 pages, LaTeX2e (11pt), uses packages times, mathptm, hyperref | null | null | null | gr-qc | null | The second of the annual BritGrav meetings on current research in
Gravitational Physics in Britain took place at the School of Mathematical
Sciences of Queen Mary, University of London on June 10/11, 2002. 47 plenary
talks of 12min duration were given. We make available the abstracts of the
talks and the references t... | [
{
"created": "Tue, 23 Jul 2002 16:34:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"van Elst",
"Henk",
""
],
[
"Tavakol",
"Reza",
""
]
] | The second of the annual BritGrav meetings on current research in Gravitational Physics in Britain took place at the School of Mathematical Sciences of Queen Mary, University of London on June 10/11, 2002. 47 plenary talks of 12min duration were given. We make available the abstracts of the talks and the references to ... |
gr-qc/0207110 | Alfonso Garcia-Parrado | Alfonso Garc\'ia-Parrado and Jos\'e M M Senovilla | Causal Relationship: a new tool for the causal characterization of
Lorentzian manifolds | 47 pages, 10 figures. Version to appear in Classical and Quantum
Gravity | Class.Quant.Grav.20:625-664,2003 | 10.1088/0264-9381/20/4/305 | null | gr-qc math-ph math.DG math.MP | null | We define and study a new kind of relation between two diffeomorphic
Lorentzian manifolds called {\em causal relation}, which is any diffeomorphism
characterized by mapping every causal vector of the first manifold onto a
causal vector of the second. We perform a thorough study of the mathematical
properties of causa... | [
{
"created": "Sat, 27 Jul 2002 13:02:07 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Nov 2002 17:22:13 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Jan 2003 09:57:22 GMT",
"version": "v3"
}
] | 2016-08-16 | [
[
"García-Parrado",
"Alfonso",
""
],
[
"Senovilla",
"José M M",
""
]
] | We define and study a new kind of relation between two diffeomorphic Lorentzian manifolds called {\em causal relation}, which is any diffeomorphism characterized by mapping every causal vector of the first manifold onto a causal vector of the second. We perform a thorough study of the mathematical properties of causal ... |
1407.3980 | Petr Tretyakov | Petr V. Tretyakov | Dynamical stability of Minkowski space in higher order gravity | 15 pages; version accepted for publication in IJGMMP | Int. J. Geom. Methods Mod. Phys., 12, 1550094 (2015) | 10.1142/S0219887815500942 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Minkowski stability problem in modified gravity by using
dynamical system approach. The method to investigate dynamical stability of
Minkowski space was proposed. This method was applied for some modified gravity
theories, such as $f(R)$ gravity, $f(R)+\alpha R\Box R$ gravity and
scalar-tensor gravity ... | [
{
"created": "Tue, 15 Jul 2014 13:15:56 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2015 16:26:42 GMT",
"version": "v2"
}
] | 2015-10-21 | [
[
"Tretyakov",
"Petr V.",
""
]
] | We discuss the Minkowski stability problem in modified gravity by using dynamical system approach. The method to investigate dynamical stability of Minkowski space was proposed. This method was applied for some modified gravity theories, such as $f(R)$ gravity, $f(R)+\alpha R\Box R$ gravity and scalar-tensor gravity mo... |
gr-qc/9912054 | Philippos Papadopoulos | Philippos Papadopoulos (Portsmouth) and Jose A. Font (MPI, Garching) | Analysis of relativistic hydrodynamics in conservation form | 13 pages, uses iopart | null | null | null | gr-qc astro-ph | null | Formulations of Eulerian general relativistic ideal hydrodynamics in
conservation form are analyzed in some detail, with particular emphasis to
geometric source terms. Simple linear transformations of the equations are
introduced and the associated equivalence class is exploited for the
optimization of such sources. ... | [
{
"created": "Tue, 14 Dec 1999 15:37:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Papadopoulos",
"Philippos",
"",
"Portsmouth"
],
[
"Font",
"Jose A.",
"",
"MPI, Garching"
]
] | Formulations of Eulerian general relativistic ideal hydrodynamics in conservation form are analyzed in some detail, with particular emphasis to geometric source terms. Simple linear transformations of the equations are introduced and the associated equivalence class is exploited for the optimization of such sources. A ... |
2104.00536 | Manuel Hohmann | Manuel Hohmann | Variational Principles in Teleparallel Gravity Theories | 23 pages, no figures, journal version; invited contribution to the
Universe Special Issue "Teleparallel Gravity: Foundations and Observational
Constraints" | Universe 7 (2021) 114 | 10.3390/universe7050114 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the variational principle and derivation of the field equations for
different classes of teleparallel gravity theories, using both their
metric-affine and covariant tetrad formulations. These theories have in common
that in addition to the tetrad or metric, they employ a flat connection as
additional field v... | [
{
"created": "Tue, 30 Mar 2021 22:19:42 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 2021 17:27:05 GMT",
"version": "v2"
}
] | 2021-04-22 | [
[
"Hohmann",
"Manuel",
""
]
] | We study the variational principle and derivation of the field equations for different classes of teleparallel gravity theories, using both their metric-affine and covariant tetrad formulations. These theories have in common that in addition to the tetrad or metric, they employ a flat connection as additional field var... |
2001.08485 | Jinzhao Wang | Jinzhao Wang | The small sphere limit of quasilocal energy in higher dimensions along
lightcone cuts | 21 pages. Extended version of arXiv:1909.11973 | null | 10.1088/1361-6382/ab719d | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of quasilocal energy has been extensively studied mainly in four
dimensions. Here we report results regarding the quasilocal energy in spacetime
dimension $n\geq 4$. After generalising three distinct quasilocal energy
definitions to higher dimensions under appropriate assumptions, we evaluate
their small ... | [
{
"created": "Thu, 23 Jan 2020 13:10:12 GMT",
"version": "v1"
}
] | 2020-02-05 | [
[
"Wang",
"Jinzhao",
""
]
] | The problem of quasilocal energy has been extensively studied mainly in four dimensions. Here we report results regarding the quasilocal energy in spacetime dimension $n\geq 4$. After generalising three distinct quasilocal energy definitions to higher dimensions under appropriate assumptions, we evaluate their small sp... |
2010.03973 | Mohammad Ali Gorji | Katsuki Aoki, Mohammad Ali Gorji, Shuntaro Mizuno, Shinji Mukohyama | Inflationary gravitational waves in consistent $D\to 4$
Einstein-Gauss-Bonnet gravity | 30 pages, 4 figures, observational bound is corrected | null | 10.1088/1475-7516/2021/01/054 | YITP-20-124, IPMU20-0104 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the slow-roll single field inflation in the context of the
consistent $D\to4$ Einstein-Gauss-Bonnet gravity that was recently proposed in
\cite{Aoki:2020lig}. In addition to the standard attractor regime, we find a
new attractor regime which we call the Gauss-Bonnet attractor as the dominant
contribution com... | [
{
"created": "Wed, 7 Oct 2020 13:14:20 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Apr 2021 10:11:43 GMT",
"version": "v2"
}
] | 2021-05-03 | [
[
"Aoki",
"Katsuki",
""
],
[
"Gorji",
"Mohammad Ali",
""
],
[
"Mizuno",
"Shuntaro",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | We study the slow-roll single field inflation in the context of the consistent $D\to4$ Einstein-Gauss-Bonnet gravity that was recently proposed in \cite{Aoki:2020lig}. In addition to the standard attractor regime, we find a new attractor regime which we call the Gauss-Bonnet attractor as the dominant contribution comes... |
2107.06726 | Jose Luis Bl\'azquez-Salcedo | Jose Luis Bl\'azquez-Salcedo, Fech Scen Khoo, Jutta Kunz and Vincent
Preut | Polar Quasinormal Modes of Neutron Stars in Massive Scalar-Tensor
Theories | 24 pages, 10 figures; Invited contribution to the volume "Quasinormal
Modes in Relativistic Stars and Black Holes", published in Frontiers in
Physics | Front. Phys. 9:741427 (2021) | 10.3389/fphy.2021.741427 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study polar quasinormal modes of relativistic stars in scalar-tensor
theories, where we include a massive gravitational scalar field and employ the
standard Brans-Dicke coupling function. For the potential of the scalar field
we consider a simple mass term as well as a potential associated with $R^2$
gravity. The ... | [
{
"created": "Wed, 14 Jul 2021 14:17:02 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Khoo",
"Fech Scen",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Preut",
"Vincent",
""
]
] | We study polar quasinormal modes of relativistic stars in scalar-tensor theories, where we include a massive gravitational scalar field and employ the standard Brans-Dicke coupling function. For the potential of the scalar field we consider a simple mass term as well as a potential associated with $R^2$ gravity. The pr... |
1404.6639 | Yuxuan Peng | Li-Ming Cao, Yuxuan Peng, Jianfei Xu | Lichnerowicz-Type Theorems for Self-gravitating Systems with Nonlinear
Electromagnetic Fields | revtex4, 7 pages, no figure, one conclusion and an explanation for
the derivation added | Phys. Rev. D 90, 024046 (2014) | 10.1103/PhysRevD.90.024046 | ICTS-USTC-14-13 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a self-gravitating system containing a globally timelike Killing
vector and a nonlinear Born-Infeld electromagnetic field and scalar fields. We
prove that under certain boundary conditions (asymptotically flat/AdS) there
can't be any nontrivial field configurations in the spacetime. To explore
nontrivial ... | [
{
"created": "Sat, 26 Apr 2014 13:15:03 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jul 2014 08:19:13 GMT",
"version": "v2"
}
] | 2014-07-22 | [
[
"Cao",
"Li-Ming",
""
],
[
"Peng",
"Yuxuan",
""
],
[
"Xu",
"Jianfei",
""
]
] | We consider a self-gravitating system containing a globally timelike Killing vector and a nonlinear Born-Infeld electromagnetic field and scalar fields. We prove that under certain boundary conditions (asymptotically flat/AdS) there can't be any nontrivial field configurations in the spacetime. To explore nontrivial so... |
gr-qc/0508086 | Eduardo V. Correa Silva | G. A. Monerat, E. V. Correa Silva, G. Oliveira-Neto, L. G. Ferreira
Filho and N. A. Lemos | Quantization of Friedmann-Robertson-Walker spacetimes in the presence of
a negative cosmological constant and radiation | 34 pages, 3 figures | Phys.Rev. D73 (2006) 044022 | 10.1103/PhysRevD.73.044022 | null | gr-qc | null | We quantize three Friedmann-Robertson-Walker models in the presence of a
negative cosmological constant and radiation. The models differ from each other
by the constant curvature of the spatial sections, which may be positive,
negative or zero. They give rise to Wheeler-DeWitt equations for the scale
factor which hav... | [
{
"created": "Sat, 20 Aug 2005 15:29:37 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Monerat",
"G. A.",
""
],
[
"Silva",
"E. V. Correa",
""
],
[
"Oliveira-Neto",
"G.",
""
],
[
"Filho",
"L. G. Ferreira",
""
],
[
"Lemos",
"N. A.",
""
]
] | We quantize three Friedmann-Robertson-Walker models in the presence of a negative cosmological constant and radiation. The models differ from each other by the constant curvature of the spatial sections, which may be positive, negative or zero. They give rise to Wheeler-DeWitt equations for the scale factor which have ... |
1806.07742 | Prabir Rudra | Prabir Rudra (Asutosh College), Sayani Maity (Techno India Salt Lake) | Vaidya Spacetime in Brans-Dicke Gravity's Rainbow | 19 pages, 15 figures | null | 10.1140/epjc/s10052-018-6304-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we study an energy dependent deformation of a time dependent
geometry in the background of Brans-Dicke gravity theory. The study is
performed using the gravity's rainbow formalism. We compute the field equations
in Brans-Dicke gravity's rainbow using Vaidya metric which is a time dependent
geometry. We s... | [
{
"created": "Mon, 18 Jun 2018 19:05:13 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Rudra",
"Prabir",
"",
"Asutosh College"
],
[
"Maity",
"Sayani",
"",
"Techno India Salt Lake"
]
] | In this note we study an energy dependent deformation of a time dependent geometry in the background of Brans-Dicke gravity theory. The study is performed using the gravity's rainbow formalism. We compute the field equations in Brans-Dicke gravity's rainbow using Vaidya metric which is a time dependent geometry. We stu... |
1512.05663 | Nigel Bishop | Nigel T. Bishop | Gravitational waves in a de Sitter universe | 9 pages | Phys. Rev. D 93, 044025 (2016) | 10.1103/PhysRevD.93.044025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The construction of exact linearized solutions to the Einstein equations
within the Bondi-Sachs formalism is extended to the case of linearization about
de Sitter spacetime. The gravitational wave field measured by distant observers
is constructed, leading to a determination of the energy measured by such
observers. ... | [
{
"created": "Thu, 17 Dec 2015 16:43:42 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2016 11:39:24 GMT",
"version": "v2"
}
] | 2016-03-03 | [
[
"Bishop",
"Nigel T.",
""
]
] | The construction of exact linearized solutions to the Einstein equations within the Bondi-Sachs formalism is extended to the case of linearization about de Sitter spacetime. The gravitational wave field measured by distant observers is constructed, leading to a determination of the energy measured by such observers. It... |
2310.06018 | Tajron Juri\'c Dr. sc. | Nikola Herceg, Tajron Juri\'c, Andjelo Samsarov, Ivica Smoli\'c, Kumar
S. Gupta | Gravitational probe of quantum spacetime | 7 pages, 2 figures, improved version | Phys.Lett.B 854 (2024) 138716 | 10.1016/j.physletb.2024.138716 | RBI-ThPhys-2023-39; ZTF-EP-23-05 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quest for phenomenological footprints of quantum gravity is among the
central scientific tasks in the rising era of gravitational wave astronomy. We
study gravitational wave dynamics within the noncommutative geometry framework,
based on a Drinfeld twist and newly proposed noncommutative Einstein equation,
and obta... | [
{
"created": "Mon, 9 Oct 2023 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2024 12:20:26 GMT",
"version": "v2"
}
] | 2024-05-24 | [
[
"Herceg",
"Nikola",
""
],
[
"Jurić",
"Tajron",
""
],
[
"Samsarov",
"Andjelo",
""
],
[
"Smolić",
"Ivica",
""
],
[
"Gupta",
"Kumar S.",
""
]
] | A quest for phenomenological footprints of quantum gravity is among the central scientific tasks in the rising era of gravitational wave astronomy. We study gravitational wave dynamics within the noncommutative geometry framework, based on a Drinfeld twist and newly proposed noncommutative Einstein equation, and obtain... |
1712.08724 | Wilson Rojas warojasc | W. A. Rojas C, J. R. Arenas S | Black Shells, Dirac's Field and the species problem | 31 pages, 11 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a thermal atmosphere around a black hole as vacuum excitations
near to gravitational radius of a contracting thin black shell, i.e., in terms
of properties of the physical vacuum of fields around a thin shell of mass $M$
collapsing from infinity to the Schwarzschild radius according to an external
station... | [
{
"created": "Sat, 23 Dec 2017 06:52:15 GMT",
"version": "v1"
}
] | 2017-12-27 | [
[
"C",
"W. A. Rojas",
""
],
[
"S",
"J. R. Arenas",
""
]
] | We describe a thermal atmosphere around a black hole as vacuum excitations near to gravitational radius of a contracting thin black shell, i.e., in terms of properties of the physical vacuum of fields around a thin shell of mass $M$ collapsing from infinity to the Schwarzschild radius according to an external stationar... |
2010.12910 | Alexander B. Balakin | Alexander B. Balakin and Amir F. Shakirzyanov | Is the axionic dark matter an equilibrium system? | Based on the talk presented on the 17th Russian Conference on
Gravitation, Cosmology and Astrophysics (RUSGRAV-17) | Universe 2020, 6(11), 192 | 10.3390/universe6110192 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an axionic dark matter model with a modified periodic potential
for the pseudoscalar field in the framework of the axionic extension of the
Einstein-aether theory. The modified potential is assumed to be equipped by the
guiding function, which depends on the expansion scalar constructed as the
trace of th... | [
{
"created": "Sat, 24 Oct 2020 14:43:44 GMT",
"version": "v1"
}
] | 2020-10-27 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Shakirzyanov",
"Amir F.",
""
]
] | We consider an axionic dark matter model with a modified periodic potential for the pseudoscalar field in the framework of the axionic extension of the Einstein-aether theory. The modified potential is assumed to be equipped by the guiding function, which depends on the expansion scalar constructed as the trace of the ... |
2212.10893 | Yong Cai | Yong Cai | Generating enhanced parity-violating gravitational waves during
inflation with violation of the null energy condition | 24 pages, 16 figures; new references added, updated to match the
published version | Phys. Rev. D 107, 063512 (2023) | 10.1103/PhysRevD.107.063512 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | A violation of the null energy condition (NEC) during inflation in a
single-field inflation model will naturally enhance the amplitude of the parity
violation effect (defined by $\Delta\chi$) of inflationary primordial
gravitational waves (GWs), provided the inflaton is non-minimally coupled to a
gravitational Chern-... | [
{
"created": "Wed, 21 Dec 2022 10:03:49 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Mar 2023 08:08:58 GMT",
"version": "v2"
}
] | 2023-03-14 | [
[
"Cai",
"Yong",
""
]
] | A violation of the null energy condition (NEC) during inflation in a single-field inflation model will naturally enhance the amplitude of the parity violation effect (defined by $\Delta\chi$) of inflationary primordial gravitational waves (GWs), provided the inflaton is non-minimally coupled to a gravitational Chern-Si... |
gr-qc/0410071 | Surhud More | Surhud Shrikant More | Higher Order Corrections to Black Hole Entropy | 9 pages, Revised version to appear in Classical and Quantum Gravity | Class.Quant.Grav. 22 (2005) 4129-4140 | 10.1088/0264-9381/22/19/021 | null | gr-qc hep-th | null | A scheme for calculating corrections to all orders to the entropy of any
thermodynamic system due to statistical fluctuations around equilibrium has
been developed. It is then applied to the BTZ black hole, AdS-Schwarzschild
black Hole and Schwarzschild black Hole in a cavity. The scheme that we present
is a model-in... | [
{
"created": "Fri, 15 Oct 2004 16:53:55 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Aug 2005 04:39:41 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"More",
"Surhud Shrikant",
""
]
] | A scheme for calculating corrections to all orders to the entropy of any thermodynamic system due to statistical fluctuations around equilibrium has been developed. It is then applied to the BTZ black hole, AdS-Schwarzschild black Hole and Schwarzschild black Hole in a cavity. The scheme that we present is a model-inde... |
gr-qc/0503085 | Luis Nunez A. | F. Aguirre, L. A. Nunez and T. Soldovieri | Variable Eddington Factor and Radiating Slowly Rotating Bodies in
General Relativity | 37 pages, 11 figures. Same results, we hope better presented. Two
last sections re-written | null | null | null | gr-qc astro-ph | null | We present an extension to a previous work to study the collapse of a
radiating, slow-rotating self-gravitating relativistic configuration. In order
to simulate dissipation effects due to the transfer of photons and/or neutrinos
within the matter configuration, we introduce the flux factor, the variable
Eddington fac... | [
{
"created": "Sun, 20 Mar 2005 04:34:06 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Aug 2006 19:12:28 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Aguirre",
"F.",
""
],
[
"Nunez",
"L. A.",
""
],
[
"Soldovieri",
"T.",
""
]
] | We present an extension to a previous work to study the collapse of a radiating, slow-rotating self-gravitating relativistic configuration. In order to simulate dissipation effects due to the transfer of photons and/or neutrinos within the matter configuration, we introduce the flux factor, the variable Eddington facto... |
gr-qc/9212012 | Ctirad Klimcik | C. Klim\v{c}\'ik and P. Koln\'ik | Collisions of Einstein-Conformal Scalar Waves | 17 pages, LaTeX | null | 10.1103/PhysRevD.48.616 | PRA-HEP-92/19 | gr-qc | null | A large class of solutions of the Einstein-conformal scalar equations in
D=2+1 and D=3+1 is identified. They describe the collisions of asymptotic
conformal scalar waves and are generated from Einstein-minimally coupled scalar
spacetimes via a (generalized) Bekenstein transformation. Particular emphasis
is given to t... | [
{
"created": "Fri, 18 Dec 1992 13:58:14 GMT",
"version": "v1"
}
] | 2016-08-17 | [
[
"Klimčík",
"C.",
""
],
[
"Kolník",
"P.",
""
]
] | A large class of solutions of the Einstein-conformal scalar equations in D=2+1 and D=3+1 is identified. They describe the collisions of asymptotic conformal scalar waves and are generated from Einstein-minimally coupled scalar spacetimes via a (generalized) Bekenstein transformation. Particular emphasis is given to the... |
2011.09818 | Emmanuele Battista Dr. | Emmanuele Battista | Nonsingular bouncing cosmology in general relativity: physical analysis
of the spacetime defect | v4: 34 pages, 12 figures; Sec. 2 has been expanded and new references
have been added. Accepted for publication in Classical and Quantum Gravity | null | 10.1088/1361-6382/ac1900 | KA-TP-20-2020 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we describe physical effects occurring in the regularized
Robertson-Walker spacetime which can reveal the presence of the defect. Our
analysis is based on two main physical quantities: the compressive forces
acting on (human) observers and the energy possessed by massive particles and
photons during th... | [
{
"created": "Thu, 19 Nov 2020 13:41:03 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 2021 12:28:41 GMT",
"version": "v2"
},
{
"created": "Wed, 12 May 2021 21:26:42 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Jul 2021 11:32:59 GMT",
"version": "v4"
}
] | 2021-08-02 | [
[
"Battista",
"Emmanuele",
""
]
] | In this paper, we describe physical effects occurring in the regularized Robertson-Walker spacetime which can reveal the presence of the defect. Our analysis is based on two main physical quantities: the compressive forces acting on (human) observers and the energy possessed by massive particles and photons during thei... |
0904.2774 | Thomas Sotiriou | Thomas P. Sotiriou | f(R) gravity, torsion and non-metricity | v2: slightly shortened version published in CQG as a Fast Track
Communication | Class.Quant.Grav.26:152001,2009 | 10.1088/0264-9381/26/15/152001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For both f(R) theories of gravity with an independent symmetric connection
(no torsion), usually referred to as Palatini f(R) gravity theories, and for
f(R) theories of gravity with torsion but no non-metricity, called U4 theories,
it has been shown that the independent connection can actually be eliminated
algebraic... | [
{
"created": "Fri, 17 Apr 2009 20:05:06 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2009 16:45:32 GMT",
"version": "v2"
}
] | 2010-04-30 | [
[
"Sotiriou",
"Thomas P.",
""
]
] | For both f(R) theories of gravity with an independent symmetric connection (no torsion), usually referred to as Palatini f(R) gravity theories, and for f(R) theories of gravity with torsion but no non-metricity, called U4 theories, it has been shown that the independent connection can actually be eliminated algebraical... |
1102.2451 | Anil Zenginoglu C | An{\i}l Zengino\u{g}lu | A geometric framework for black hole perturbations | 4 pages, 1 figure | Phys.Rev.D83:127502,2011 | 10.1103/PhysRevD.83.127502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole perturbation theory is typically studied on time surfaces that
extend between the bifurcation sphere and spatial infinity. From a physical
point of view, however, it may be favorable to employ time surfaces that extend
between the future event horizon and future null infinity. This framework
resolves probl... | [
{
"created": "Fri, 11 Feb 2011 22:21:41 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2011 04:04:30 GMT",
"version": "v2"
}
] | 2011-07-04 | [
[
"Zenginoğlu",
"Anıl",
""
]
] | Black hole perturbation theory is typically studied on time surfaces that extend between the bifurcation sphere and spatial infinity. From a physical point of view, however, it may be favorable to employ time surfaces that extend between the future event horizon and future null infinity. This framework resolves problem... |
gr-qc/9409035 | P. R. Brady | Patrick R Brady | Self-Similar Scalar Field Collapse: Naked Singularities and Critical
Behaviour | 27 pages including 5 encapsulated postcript figures in separate
compressed file, report NCL94-TP12 | Phys.Rev. D51 (1995) 4168-4176 | 10.1103/PhysRevD.51.4168 | null | gr-qc | null | Homothetic scalar field collapse is considered in this article. By making a
suitable choice of variables the equations are reduced to an autonomous system.
Then using a combination of numerical and analytic techniques it is shown that
there are two classes of solutions. The first consists of solutions with a
non-sing... | [
{
"created": "Fri, 16 Sep 1994 15:16:06 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Brady",
"Patrick R",
""
]
] | Homothetic scalar field collapse is considered in this article. By making a suitable choice of variables the equations are reduced to an autonomous system. Then using a combination of numerical and analytic techniques it is shown that there are two classes of solutions. The first consists of solutions with a non-singul... |
2107.04359 | Alexandru Dima | Alexandru Dima, Miguel Bezares, Enrico Barausse | Dynamical Chameleon Neutron Stars: stability, radial oscillations and
scalar radiation in spherical symmetry | 21 pages, 17 figures | Phys. Rev. D 104, 084017 (2021) | 10.1103/PhysRevD.104.084017 | null | gr-qc astro-ph.CO astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor theories whose phenomenology differs significantly from general
relativity on large (e.g. cosmological) scales do not typically pass local
experimental tests (e.g. in the solar system) unless they present a suitable
"screening mechanism". An example is provided by chameleon screening, whereby
the local ... | [
{
"created": "Fri, 9 Jul 2021 10:51:34 GMT",
"version": "v1"
}
] | 2021-10-13 | [
[
"Dima",
"Alexandru",
""
],
[
"Bezares",
"Miguel",
""
],
[
"Barausse",
"Enrico",
""
]
] | Scalar-tensor theories whose phenomenology differs significantly from general relativity on large (e.g. cosmological) scales do not typically pass local experimental tests (e.g. in the solar system) unless they present a suitable "screening mechanism". An example is provided by chameleon screening, whereby the local ge... |
1011.5399 | Valeria Kagramanova | Saskia Grunau and Valeria Kagramanova | Geodesics of electrically and magnetically charged test particles in the
Reissner-Nordstr\"om space-time: analytical solutions | null | Phys.Rev.D83:044009,2011 | 10.1103/PhysRevD.83.044009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the full set of analytical solutions of the geodesic equations of
charged test particles in the Reissner-Nordstr\"om space-time in terms of the
Weierstra{\ss} $\wp$, $\sigma$ and $\zeta$ elliptic functions. Based on the
study of the polynomials in the $\vartheta$ and $r$ equations we characterize
the motio... | [
{
"created": "Wed, 24 Nov 2010 15:36:03 GMT",
"version": "v1"
}
] | 2011-02-18 | [
[
"Grunau",
"Saskia",
""
],
[
"Kagramanova",
"Valeria",
""
]
] | We present the full set of analytical solutions of the geodesic equations of charged test particles in the Reissner-Nordstr\"om space-time in terms of the Weierstra{\ss} $\wp$, $\sigma$ and $\zeta$ elliptic functions. Based on the study of the polynomials in the $\vartheta$ and $r$ equations we characterize the motion ... |
1910.12083 | Ben David Normann Mr. | Ben David Normann and Sigbj{\o}rn Hervik | Collins in Wonderland | 27 pages, 4 figures | 2020 Class. Quantum Grav. 37 145002 | 10.1088/1361-6382/ab8be7 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | What is the asymptotic future of a scalar-field model if the assumption of
isotropy is relaxed in generic, homogeneous space-times with general
relativity? This paper is a continuation of our previous work on Bianchi
cosmologies with a $p$-form field (where $p\,\in\,\{1,3\}$)---or equivalently:
an inhomogeneous, mass... | [
{
"created": "Sat, 26 Oct 2019 15:12:26 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 2020 10:48:47 GMT",
"version": "v2"
}
] | 2020-07-08 | [
[
"Normann",
"Ben David",
""
],
[
"Hervik",
"Sigbjørn",
""
]
] | What is the asymptotic future of a scalar-field model if the assumption of isotropy is relaxed in generic, homogeneous space-times with general relativity? This paper is a continuation of our previous work on Bianchi cosmologies with a $p$-form field (where $p\,\in\,\{1,3\}$)---or equivalently: an inhomogeneous, mass-l... |
gr-qc/0002023 | Merced Montesinos | Merced Montesinos | Relational evolution of the degrees of freedom of generally covariant
quantum theories | 25 pages, no figures, Latex file. Revised version | Gen.Rel.Grav. 33 (2001) 1-28 | 10.1023/A:1002067601136 | null | gr-qc hep-th quant-ph | null | We study the classical and quantum dynamics of generally covariant theories
with vanishing a Hamiltonian and with a finite number of degrees of freedom. In
particular, the geometric meaning of the full solution of the relational
evolution of the degrees of freedom is displayed, which means the determination
of the to... | [
{
"created": "Fri, 4 Feb 2000 17:13:26 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jan 2001 18:51:52 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Montesinos",
"Merced",
""
]
] | We study the classical and quantum dynamics of generally covariant theories with vanishing a Hamiltonian and with a finite number of degrees of freedom. In particular, the geometric meaning of the full solution of the relational evolution of the degrees of freedom is displayed, which means the determination of the tota... |
0906.5430 | Salvatore Capozziello | S. Capozziello, E. Piedipalumbo, C. Rubano, P. Scudellaro | Testing an exact $f(R)$-gravity model at Galactic and local scales | 8 pages, 2 figures, accepted in Astron. & Astroph | Astron.Astrophys.505:21-28,2009 | 10.1051/0004-6361/200911992 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The weak field limit for a pointlike source of a $f(R) \propto
R^{3/2}$-gravity model is studied. We aim to show the viability of such a model
as a valid alternative to GR + dark matter at Galactic and local scales.
Without considering dark matter, within the weak field approximation, we find
general exact solutions ... | [
{
"created": "Tue, 30 Jun 2009 07:53:40 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2009 14:54:06 GMT",
"version": "v2"
}
] | 2011-05-09 | [
[
"Capozziello",
"S.",
""
],
[
"Piedipalumbo",
"E.",
""
],
[
"Rubano",
"C.",
""
],
[
"Scudellaro",
"P.",
""
]
] | The weak field limit for a pointlike source of a $f(R) \propto R^{3/2}$-gravity model is studied. We aim to show the viability of such a model as a valid alternative to GR + dark matter at Galactic and local scales. Without considering dark matter, within the weak field approximation, we find general exact solutions fo... |
gr-qc/0212069 | Clifford M. Will | Clifford M. Will | Covariant Calculation of General Relativistic Effects in an Orbiting
Gyroscope Experiment | 7 pages, 1 figure, to be submitted to Phys. Rev. D | Phys.Rev. D67 (2003) 062003 | 10.1103/PhysRevD.67.062003 | null | gr-qc | null | We carry out a covariant calculation of the measurable relativistic effects
in an orbiting gyroscope experiment. The experiment, currently known as Gravity
Probe B, compares the spin directions of an array of spinning gyroscopes with
the optical axis of a telescope, all housed in a spacecraft that rolls about
the opt... | [
{
"created": "Mon, 16 Dec 2002 15:39:18 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Will",
"Clifford M.",
""
]
] | We carry out a covariant calculation of the measurable relativistic effects in an orbiting gyroscope experiment. The experiment, currently known as Gravity Probe B, compares the spin directions of an array of spinning gyroscopes with the optical axis of a telescope, all housed in a spacecraft that rolls about the optic... |
2202.11458 | Hans Ringstr\"om | Hans Ringstr\"om | Initial data on big bang singularities in symmetric settings | 20 pages, 1 figure | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In a recent article, we propose a general geometric notion of initial data on
big bang singularities. This notion is of interest in its own right. However,
it also serves the purpose of giving a unified perspective on many of the
results in the literature. In the present article, we give a partial
justification of th... | [
{
"created": "Wed, 23 Feb 2022 12:20:37 GMT",
"version": "v1"
}
] | 2022-02-24 | [
[
"Ringström",
"Hans",
""
]
] | In a recent article, we propose a general geometric notion of initial data on big bang singularities. This notion is of interest in its own right. However, it also serves the purpose of giving a unified perspective on many of the results in the literature. In the present article, we give a partial justification of this... |
1105.3971 | Luciano Rezzolla | Riccardo Ciolfi, Samuel K. Lander, Gian Mario Manca, Luciano Rezzolla | Instability-driven evolution of poloidal magnetic fields in relativistic
stars | 5 pages, 4 figures; small changes; accepted for publication in ApJL | Astrophys. J. Lett. 736, L6 (2011) | 10.1088/2041-8205/736/1/L6 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of the stability of magnetic fields in stars has a long history
and has been investigated in detail in perturbation theory. Here we consider
the nonlinear evolution of a non-rotating neutron star with a purely poloidal
magnetic field, in general relativity. We find that an instability develops in
the regi... | [
{
"created": "Thu, 19 May 2011 19:43:16 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Jun 2011 05:19:41 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Ciolfi",
"Riccardo",
""
],
[
"Lander",
"Samuel K.",
""
],
[
"Manca",
"Gian Mario",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | The problem of the stability of magnetic fields in stars has a long history and has been investigated in detail in perturbation theory. Here we consider the nonlinear evolution of a non-rotating neutron star with a purely poloidal magnetic field, in general relativity. We find that an instability develops in the region... |
2201.13335 | Lisa Valerie Drummond | Lisa V. Drummond and Scott A. Hughes | Precisely computing bound orbits of spinning bodies around black holes
II: Generic orbits | 24 pages, 8 figures, submitted to Physical Review D; typos in
supplementary Mathematica notebook corrected | null | 10.1103/PhysRevD.105.124041 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we continue our study of the motion of spinning test bodies
orbiting Kerr black holes. Non-spinning test bodies follow geodesics of the
spacetime in which they move. A test body's spin couples to the curvature of
that spacetime, introducing a "spin-curvature force" which pushes the body's
worldline awa... | [
{
"created": "Mon, 31 Jan 2022 16:31:16 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2022 17:48:15 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Drummond",
"Lisa V.",
""
],
[
"Hughes",
"Scott A.",
""
]
] | In this paper, we continue our study of the motion of spinning test bodies orbiting Kerr black holes. Non-spinning test bodies follow geodesics of the spacetime in which they move. A test body's spin couples to the curvature of that spacetime, introducing a "spin-curvature force" which pushes the body's worldline away ... |
1401.0800 | Abdelmoumene Belabbas moumene | Abdelmoumene Belabbas | Les Interactions Fondamentales et la Structure de l'Espace-temps | PhD Thesis (2011), 193 pages, 3 figures, text in french, University
of Bejaia (Algeria) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the light of intriguing results of C.C.Barros, we investigate in this
thesis the possibilities of geometrical interpretation of all the fundamental
interactions in order to unify them. More exactly we try to supply a unified
geometrical description for gravitation and electromagnetism.
The analysis of Huei's sta... | [
{
"created": "Sat, 4 Jan 2014 11:45:36 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2014 15:45:06 GMT",
"version": "v2"
}
] | 2014-03-20 | [
[
"Belabbas",
"Abdelmoumene",
""
]
] | In the light of intriguing results of C.C.Barros, we investigate in this thesis the possibilities of geometrical interpretation of all the fundamental interactions in order to unify them. More exactly we try to supply a unified geometrical description for gravitation and electromagnetism. The analysis of Huei's standar... |
gr-qc/9212001 | Sean Hayward | Sean A. Hayward | Cosmic Censorship in 2-Dimensional Dilaton Gravity | 10 pages | Class.Quant.Grav.10:985-994,1993 | 10.1088/0264-9381/10/5/015 | null | gr-qc | null | The global structure of 2-dimensional dilaton gravity is studied, attending
in particular to black holes and singularities. A gravitational energy is
defined and shown to be positive at spatial singularities and negative at
temporal singularities. Trapped points are defined, and it is shown that
spatial singularities... | [
{
"created": "Wed, 2 Dec 1992 13:28:05 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Hayward",
"Sean A.",
""
]
] | The global structure of 2-dimensional dilaton gravity is studied, attending in particular to black holes and singularities. A gravitational energy is defined and shown to be positive at spatial singularities and negative at temporal singularities. Trapped points are defined, and it is shown that spatial singularities a... |
gr-qc/9704029 | Andrew Liddle | Franz E Schunck and Andrew R Liddle | The gravitational redshift of boson stars | 7 pages RevTeX file with five figures incorporated (uses RevTeX and
psfig) | Phys.Lett.B404:25-32,1997 | 10.1016/S0370-2693(97)00559-5 | SUSSEX-AST 97/4-1 | gr-qc astro-ph | null | We investigate the possible gravitational redshift values for boson stars
with a self-interaction, studying a wide range of possible masses. We find a
limiting value of $z_{lim} \simeq 0.687$ for stable boson star configurations.
We compare theoretical expectation with the observational capabilities in
several differ... | [
{
"created": "Thu, 10 Apr 1997 08:25:32 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Schunck",
"Franz E",
""
],
[
"Liddle",
"Andrew R",
""
]
] | We investigate the possible gravitational redshift values for boson stars with a self-interaction, studying a wide range of possible masses. We find a limiting value of $z_{lim} \simeq 0.687$ for stable boson star configurations. We compare theoretical expectation with the observational capabilities in several differen... |
1608.01002 | Jorma Louko | Jorma Louko, Vladimir Toussaint | Unruh-DeWitt detector's response to fermions in flat spacetimes | 30 pages, low resolution figures. v2: typos corrected | Phys. Rev. D 94, 064027 (2016) | 10.1103/PhysRevD.94.064027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine an Unruh-DeWitt particle detector that is coupled linearly to the
scalar density of a massless Dirac field in Minkowski spacetimes of dimension
$d\ge2$ and on the static Minkowski cylinder in spacetime dimension two,
allowing the detector's motion to remain arbitrary and working to leading order
in perturb... | [
{
"created": "Tue, 2 Aug 2016 20:54:54 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2016 16:39:39 GMT",
"version": "v2"
}
] | 2016-09-20 | [
[
"Louko",
"Jorma",
""
],
[
"Toussaint",
"Vladimir",
""
]
] | We examine an Unruh-DeWitt particle detector that is coupled linearly to the scalar density of a massless Dirac field in Minkowski spacetimes of dimension $d\ge2$ and on the static Minkowski cylinder in spacetime dimension two, allowing the detector's motion to remain arbitrary and working to leading order in perturbat... |
1805.03751 | Igor Khavkine | Igor Khavkine | Compatibility complexes of overdetermined PDEs of finite type, with
applications to the Killing equation | v2: 40 pages, added background and notation overview appendices,
close to published version; v1: 29 pages, no figures | Class. Quantum Grav. 36 (2019) 185012 | 10.1088/1361-6382/ab329a | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In linearized gravity, two linearized metrics are considered
gauge-equivalent, $h_{ab} \sim h_{ab} + K_{ab}[v]$, when they differ by the
image of the Killing operator, $K_{ab}[v] = \nabla_a v_b + \nabla_b v_a$. A
universal (or complete) compatibility operator for $K$ is a differential
operator $K_1$ such that $K_1 \c... | [
{
"created": "Wed, 9 May 2018 22:48:34 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2019 07:49:29 GMT",
"version": "v2"
}
] | 2019-09-20 | [
[
"Khavkine",
"Igor",
""
]
] | In linearized gravity, two linearized metrics are considered gauge-equivalent, $h_{ab} \sim h_{ab} + K_{ab}[v]$, when they differ by the image of the Killing operator, $K_{ab}[v] = \nabla_a v_b + \nabla_b v_a$. A universal (or complete) compatibility operator for $K$ is a differential operator $K_1$ such that $K_1 \cir... |
1110.3181 | Valentin Gladush | Valentin D. Gladush, Dmitry A. Kulikov | Naked Reissner-Nordstr\"om singularity and quasiclassical bound states | 3 pages | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The bound-state problem for an uncharged massive scalar particle in the field
of a naked Reissner-Nordstr\"om singularity is approached by means of the
quasiclassical Bohr-Sommerfeld quantization. An approximate analytical
expression for the energy levels of the system is derived. It is shown that in
order to obtain ... | [
{
"created": "Fri, 14 Oct 2011 12:07:01 GMT",
"version": "v1"
}
] | 2011-10-17 | [
[
"Gladush",
"Valentin D.",
""
],
[
"Kulikov",
"Dmitry A.",
""
]
] | The bound-state problem for an uncharged massive scalar particle in the field of a naked Reissner-Nordstr\"om singularity is approached by means of the quasiclassical Bohr-Sommerfeld quantization. An approximate analytical expression for the energy levels of the system is derived. It is shown that in order to obtain no... |
1603.02851 | Daniel M\"uller | A. Toporensky and D. M\"uller | On stability of the Kasner solution in quadratic gravity | null | null | 10.1007/s10714-016-2172-9 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider dynamics of a flat anisotropic Universe filled by a perfect fluid
near a cosmological singularity in quadratic gravity. Two possible regimes are
described -- the Kasner anisotropic solution and an isotropic "vacuum
radiation" solution which has three sub cases depending on whether the equation
of state pa... | [
{
"created": "Wed, 9 Mar 2016 11:30:16 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2016 08:10:15 GMT",
"version": "v2"
}
] | 2017-01-04 | [
[
"Toporensky",
"A.",
""
],
[
"Müller",
"D.",
""
]
] | We consider dynamics of a flat anisotropic Universe filled by a perfect fluid near a cosmological singularity in quadratic gravity. Two possible regimes are described -- the Kasner anisotropic solution and an isotropic "vacuum radiation" solution which has three sub cases depending on whether the equation of state para... |
2104.15123 | Emmanuil Saridakis | Fotios K. Anagnostopoulos, Spyros Basilakos, Emmanuel N. Saridakis | First evidence that non-metricity f(Q) gravity could challenge
$\Lambda$CDM | 4 pages, 2 figures, 2 Tables, version to appear in Phys.Lett.B | null | 10.1016/j.physletb.2021.136634 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel model in the framework of $f(Q)$ gravity, which is a
gravitational modification class arising from the incorporation of
non-metricity. The model has General Relativity as a particular limit, it has
the same number of free parameters to those of $\Lambda$CDM, however at a
cosmological framework it g... | [
{
"created": "Fri, 30 Apr 2021 17:26:52 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2021 16:33:37 GMT",
"version": "v2"
}
] | 2021-09-15 | [
[
"Anagnostopoulos",
"Fotios K.",
""
],
[
"Basilakos",
"Spyros",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We propose a novel model in the framework of $f(Q)$ gravity, which is a gravitational modification class arising from the incorporation of non-metricity. The model has General Relativity as a particular limit, it has the same number of free parameters to those of $\Lambda$CDM, however at a cosmological framework it giv... |
1208.3729 | Jungjai Lee | Hyeong-Chan Kim, Jae-Weon Lee and Jungjai Lee | Causality Problem in a Holographic Dark Energy Model | 5 pages | Europhysics Letters 102, 29001 (2013) | 10.1209/0295-5075/102/29001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the model of holographic dark energy, there is a notorious problem of
circular reasoning between the introduction of future event horizon and the
accelerating expansion of the universe. We examine the problem after dividing
into two parts, the causality problem of the equation of motion and the
circular logic on t... | [
{
"created": "Sat, 18 Aug 2012 07:12:24 GMT",
"version": "v1"
}
] | 2017-08-22 | [
[
"Kim",
"Hyeong-Chan",
""
],
[
"Lee",
"Jae-Weon",
""
],
[
"Lee",
"Jungjai",
""
]
] | In the model of holographic dark energy, there is a notorious problem of circular reasoning between the introduction of future event horizon and the accelerating expansion of the universe. We examine the problem after dividing into two parts, the causality problem of the equation of motion and the circular logic on the... |
2301.01163 | Tummala Vinutha | T. Vinutha, K. Niharika and K. Sri Kavya | The study of Kantowski-Sachs perfect fluid cosmological model in
modified gravity | null | null | 10.1007/s10511-023-09771-5 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Kantowski-Sachs perfect fluid cosmological model is explored in modified
gravity with functional form $f(R, T)$=$f_1(R)$+$f_2(T)$ where $R$ is Ricci
scalar, and $T$ is the trace of the energy-momentum tensor. With this
functional form, three different cases have been formulated, namely negative
and positive powers of... | [
{
"created": "Tue, 3 Jan 2023 15:48:05 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jan 2023 04:17:03 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Feb 2023 07:26:35 GMT",
"version": "v3"
}
] | 2023-04-26 | [
[
"Vinutha",
"T.",
""
],
[
"Niharika",
"K.",
""
],
[
"Kavya",
"K. Sri",
""
]
] | Kantowski-Sachs perfect fluid cosmological model is explored in modified gravity with functional form $f(R, T)$=$f_1(R)$+$f_2(T)$ where $R$ is Ricci scalar, and $T$ is the trace of the energy-momentum tensor. With this functional form, three different cases have been formulated, namely negative and positive powers of c... |
2405.12534 | Alejandro Perez | Gabriel R. Bengochea, Gabriel Leon, Alejandro Perez | Is Planckian discreteness observable in cosmology? | null | null | null | null | gr-qc astro-ph.HE hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Planck scale inflationary era -- in a quantum gravity theory predicting
discreteness of quantum geometry at the fundamental scale -- produces the scale
invariant spectrum of inhomogeneities with very small tensor-to-scalar ratio of
perturbations and a hot big bang leading to a natural dark matter genesis
scenario. ... | [
{
"created": "Tue, 21 May 2024 06:53:37 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Bengochea",
"Gabriel R.",
""
],
[
"Leon",
"Gabriel",
""
],
[
"Perez",
"Alejandro",
""
]
] | A Planck scale inflationary era -- in a quantum gravity theory predicting discreteness of quantum geometry at the fundamental scale -- produces the scale invariant spectrum of inhomogeneities with very small tensor-to-scalar ratio of perturbations and a hot big bang leading to a natural dark matter genesis scenario. He... |
gr-qc/9610025 | Vivek Iyer | Vivek Iyer | Lagrangian perfect fluids and black hole mechanics | 26 pages LaTeX-2e | Phys.Rev. D55 (1997) 3411-3426 | 10.1103/PhysRevD.55.3411 | null | gr-qc | null | The first law of black hole mechanics (in the form derived by Wald), is
expressed in terms of integrals over surfaces, at the horizon and spatial
infinity, of a stationary, axisymmetric black hole, in a diffeomorphism
invariant Lagrangian theory of gravity. The original statement of the first law
given by Bardeen, Ca... | [
{
"created": "Tue, 15 Oct 1996 03:26:47 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Iyer",
"Vivek",
""
]
] | The first law of black hole mechanics (in the form derived by Wald), is expressed in terms of integrals over surfaces, at the horizon and spatial infinity, of a stationary, axisymmetric black hole, in a diffeomorphism invariant Lagrangian theory of gravity. The original statement of the first law given by Bardeen, Cart... |
gr-qc/9602007 | Miroslav Pardy | Miroslav Pardy (Department of Theoretical Physics and Astrophysics,
Masaryk University, Czech Republic) | The String Model of Gravity | 7 pages, revtex, 0 figures | null | null | null | gr-qc | null | The string model of gravitational force is proposed where the string forms
the mediation of the gravitational interaction between two gravitating bodies.
It reproduces the Newtonian results in the first-order approximation and it
predicts in the higher-oder approximations the existence of oscillations of the
gravitat... | [
{
"created": "Mon, 5 Feb 1996 08:16:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pardy",
"Miroslav",
"",
"Department of Theoretical Physics and Astrophysics,\n Masaryk University, Czech Republic"
]
] | The string model of gravitational force is proposed where the string forms the mediation of the gravitational interaction between two gravitating bodies. It reproduces the Newtonian results in the first-order approximation and it predicts in the higher-oder approximations the existence of oscillations of the gravitatio... |
gr-qc/0310107 | David Wiltshire | Matt Visser (Victoria University of Wellington), David L. Wiltshire
(University of Canterbury) | Stable gravastars - an alternative to black holes? | 20 pages, 5 figures; uses iopart.cls, setstack.sty; v2 - note and one
reference added | Class.Quant.Grav. 21 (2004) 1135-1152 | 10.1088/0264-9381/21/4/027 | null | gr-qc astro-ph hep-th | null | The "gravastar" picture developed by Mazur and Mottola is one of a very small
number of serious challenges to our usual conception of a "black hole". In the
gravastar picture there is effectively a phase transition at/ near where the
event horizon would have been expected to form, and the interior of what would
have ... | [
{
"created": "Thu, 23 Oct 2003 03:50:24 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2003 03:57:00 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
],
[
"Wiltshire",
"David L.",
"",
"University of Canterbury"
]
] | The "gravastar" picture developed by Mazur and Mottola is one of a very small number of serious challenges to our usual conception of a "black hole". In the gravastar picture there is effectively a phase transition at/ near where the event horizon would have been expected to form, and the interior of what would have be... |
2312.04301 | Long-Yue Li | Li-Ming Cao, Long-Yue Li, Xia-Yuan Liu, Yu-Sen Zhou | The appearance of the regular black hole with a stable inner horizon | 12 pages, 15 figures, tiltle is changed, references and discussion
are added, accepted by Phys. Rev. D | null | null | ICTS-USTC/PCFT-23-39 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The strong cosmic censorship conjecture, which states that the evolution of
generic initial data will always produce a globally hyperbolic spacetime, is
hard to be tested by astronomical observations. In this paper, we study the
appearance of the regular black hole without mass inflation, which violates the
strong co... | [
{
"created": "Thu, 7 Dec 2023 13:53:19 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 2024 10:15:46 GMT",
"version": "v2"
}
] | 2024-02-26 | [
[
"Cao",
"Li-Ming",
""
],
[
"Li",
"Long-Yue",
""
],
[
"Liu",
"Xia-Yuan",
""
],
[
"Zhou",
"Yu-Sen",
""
]
] | The strong cosmic censorship conjecture, which states that the evolution of generic initial data will always produce a globally hyperbolic spacetime, is hard to be tested by astronomical observations. In this paper, we study the appearance of the regular black hole without mass inflation, which violates the strong cosm... |
1907.04892 | Francisco X. Linares Cede\~no | Francisco X. Linares Cede\~no and Ernesto Contreras | Gravitational Decoupling in Cosmology | 10 pages. Two new figures included. Accepted for publication in
Physics of the Dark Universe | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Whereas the nature of dark components in the Universe remains unknown,
alternative models of gravity have been developed to offer a geometric
explanation to the origin of such components. In this work we use the Minimal
Geometric Deformation approach to study extensions of the theory of General
Relativity in a cosmol... | [
{
"created": "Wed, 10 Jul 2019 19:11:55 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Oct 2019 21:00:47 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Apr 2020 01:44:20 GMT",
"version": "v3"
}
] | 2020-04-03 | [
[
"Cedeño",
"Francisco X. Linares",
""
],
[
"Contreras",
"Ernesto",
""
]
] | Whereas the nature of dark components in the Universe remains unknown, alternative models of gravity have been developed to offer a geometric explanation to the origin of such components. In this work we use the Minimal Geometric Deformation approach to study extensions of the theory of General Relativity in a cosmolog... |
gr-qc/9710082 | Georges Bressange | G.F. Bressange | Plane Light-Like Shells and Impulsive Gravitational Waves in
Scalar-Tensor Theories of Gravity | 19 pages, latex, 1 figure, accepted for publication in Class. Quant.
Grav | Class.Quant.Grav. 15 (1998) 225-238 | 10.1088/0264-9381/15/1/017 | null | gr-qc | null | We study gravitational plane impulsive waves and electromagnetic shock waves
in a scalar-tensor theory of gravity of the Brans-Dicke type. In vacuum, we
present an exact solution of Brans-Dicke's field equations and give an example
in which a plane impulsive gravitational wave and a null shell of matter
coexist on th... | [
{
"created": "Thu, 16 Oct 1997 09:48:21 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Bressange",
"G. F.",
""
]
] | We study gravitational plane impulsive waves and electromagnetic shock waves in a scalar-tensor theory of gravity of the Brans-Dicke type. In vacuum, we present an exact solution of Brans-Dicke's field equations and give an example in which a plane impulsive gravitational wave and a null shell of matter coexist on the ... |
0704.1728 | S. Mignemi | S. Mignemi | Doubly Special Relativity and Finsler geometry | 8 pages, plain TeX | Phys.Rev.D76:047702,2007 | 10.1103/PhysRevD.76.047702 | null | gr-qc | null | We discuss the recent proposal of implementing Doubly Special Relativity in
configuration space by means of Finsler geometry. Although this formalism leads
to a consistent description of the dynamics of a particle, it does not seem to
give a complete description of the physics. In particular, the Finsler line
element... | [
{
"created": "Fri, 13 Apr 2007 09:51:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mignemi",
"S.",
""
]
] | We discuss the recent proposal of implementing Doubly Special Relativity in configuration space by means of Finsler geometry. Although this formalism leads to a consistent description of the dynamics of a particle, it does not seem to give a complete description of the physics. In particular, the Finsler line element i... |
gr-qc/0611038 | Julio Cesar Fabris | K.A. Bronnikov, J.C. Fabris, S.V.B. Gon\c{c}alves | Different faces of the phantom | 6 pages, presented at IRGAC 2006, Barcelona, 11-15 July 2006 | J.Phys.A40:6835-6840,2007 | 10.1088/1751-8113/40/25/S27 | null | gr-qc | null | The SNe type Ia data admit that the Universe today may be dominated by some
exotic matter with negative pressure violating all energy conditions. Such
exotic matter is called {\it phantom matter} due to the anomalies connected
with violation of the energy conditions. If a phantom matter dominates the
matter content o... | [
{
"created": "Mon, 6 Nov 2006 14:35:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Gonçalves",
"S. V. B.",
""
]
] | The SNe type Ia data admit that the Universe today may be dominated by some exotic matter with negative pressure violating all energy conditions. Such exotic matter is called {\it phantom matter} due to the anomalies connected with violation of the energy conditions. If a phantom matter dominates the matter content of ... |
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