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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9803076 | null | Antonio Dobado, Antonio L. Maroto | Particle production from nonlocal gravitational effective action | 22 pages, LaTeX, no figures. Corrected version with new comments and
results. To appear in Phys. Rev. D | Phys.Rev.D60:104045,1999 | 10.1103/PhysRevD.60.104045 | null | gr-qc hep-th | null | In this paper we show how the nonlocal effective action for gravity, obtained
after integrating out the matter fields, can be used to compute particle
production and spectra for different space-time metrics. Applying this
technique to several examples, we find that the perturbative calculation of the
effective action... | [
{
"created": "Mon, 23 Mar 1998 09:10:20 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 1999 09:44:58 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dobado",
"Antonio",
""
],
[
"Maroto",
"Antonio L.",
""
]
] | In this paper we show how the nonlocal effective action for gravity, obtained after integrating out the matter fields, can be used to compute particle production and spectra for different space-time metrics. Applying this technique to several examples, we find that the perturbative calculation of the effective action u... |
1006.2641 | Mohammad Malekjani | M. Malekjani, A. Khodam-Mohammadi | New holographic Chaplygin gas model of dark energy | 19 pages, Accepted by Int. J. Mod. Phys. D | Int.J.Mod.Phys.D20:281-297,2011 | 10.1142/S0218271811018779 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the holographic dark energy model with new
infrared cut-off (new HDE model) proposed by Granda and Oliveros. Using this
new definition for infrared cut-off, we establish the correspondence between
new HDE model and standard Chaplygin gas (SCG), generalized Chaplygin gas (GCG)
and modified... | [
{
"created": "Mon, 14 Jun 2010 09:09:37 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Nov 2010 07:37:25 GMT",
"version": "v2"
}
] | 2011-03-29 | [
[
"Malekjani",
"M.",
""
],
[
"Khodam-Mohammadi",
"A.",
""
]
] | In this work, we investigate the holographic dark energy model with new infrared cut-off (new HDE model) proposed by Granda and Oliveros. Using this new definition for infrared cut-off, we establish the correspondence between new HDE model and standard Chaplygin gas (SCG), generalized Chaplygin gas (GCG) and modified C... |
1604.08139 | Michael Boyle | Michael Boyle | The integration of angular velocity | Final version in press with Advances in Applied Clifford Algebras | Adv. Appl. Clifford Algebras (2017) 27: 2345 | 10.1007/s00006-017-0793-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A common problem in physics and engineering is determination of the
orientation of an object given its angular velocity. When the direction of the
angular velocity changes in time, this is a nontrivial problem involving
coupled differential equations. Several possible approaches are examined, along
with various impro... | [
{
"created": "Wed, 27 Apr 2016 16:52:15 GMT",
"version": "v1"
},
{
"created": "Thu, 18 May 2017 11:46:27 GMT",
"version": "v2"
}
] | 2017-10-24 | [
[
"Boyle",
"Michael",
""
]
] | A common problem in physics and engineering is determination of the orientation of an object given its angular velocity. When the direction of the angular velocity changes in time, this is a nontrivial problem involving coupled differential equations. Several possible approaches are examined, along with various improve... |
1706.09833 | Andrea Dapor | Andrea Dapor, Klaus Liegener | Cosmological Effective Hamiltonian from full Loop Quantum Gravity
Dynamics | 5 pages, 1 figure. Accepted version in PLB | Phys.Lett.B 785 (2018) | 10.1016/j.physletb.2018.09.005 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of effective dynamics has proven successful in LQC, a
loop-inspired quantization of cosmological spacetimes. We apply the same idea
of its derivation in LQC to the full theory, by computing the expectation value
of the scalar constraint with respect to some coherent states peaked on the
phase-space variab... | [
{
"created": "Thu, 29 Jun 2017 16:23:42 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2017 14:33:26 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Sep 2018 10:22:16 GMT",
"version": "v3"
}
] | 2018-09-17 | [
[
"Dapor",
"Andrea",
""
],
[
"Liegener",
"Klaus",
""
]
] | The concept of effective dynamics has proven successful in LQC, a loop-inspired quantization of cosmological spacetimes. We apply the same idea of its derivation in LQC to the full theory, by computing the expectation value of the scalar constraint with respect to some coherent states peaked on the phase-space variable... |
2406.08006 | Tuhina Ghorui | Tuhina Ghorui, Prabir Rudra, Farook Rahaman | A new type of $f(\mathcal{T})$ gravity from Barrow entropy | 15 pages, 5 figures. arXiv admin note: text overlap with
arXiv:2211.04178 by other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, two originally separate adjustments for the Friedmann equations
are concurrently considered. Firstly, the fractal structure of the black hole
horizon region is imposed by the Barrow entropy. The second adjustment is the
$f(\mathcal{T})$ gravity, which is based on a teleparallel framework
generalization ... | [
{
"created": "Wed, 12 Jun 2024 08:53:09 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Ghorui",
"Tuhina",
""
],
[
"Rudra",
"Prabir",
""
],
[
"Rahaman",
"Farook",
""
]
] | In this work, two originally separate adjustments for the Friedmann equations are concurrently considered. Firstly, the fractal structure of the black hole horizon region is imposed by the Barrow entropy. The second adjustment is the $f(\mathcal{T})$ gravity, which is based on a teleparallel framework generalization of... |
1302.6577 | Ioannis Haranas Dr. | Omiros Ragos, Ioannis Haranas and Ioannis Gkigkitzis | Effects in the Anomalistic Period of Celestial Bodies due to a
Logarithmic Correction to the Newtonian Gravitational Potential | 12 pages, 5 figures, Published in Astrophysics and Space Science,
2013 | null | 10.1007/s10509-013-1377-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the motion of a secondary celestial body under the influence of the
logarithmic corrected gravitational force of a primary one. This kind of
correction was introduced by Fabris et al. (2009). We derive two equations to
compute the rate of change of the periastron w.r.t. the eccentric anomaly and
its total va... | [
{
"created": "Sun, 24 Feb 2013 18:30:10 GMT",
"version": "v1"
}
] | 2015-03-13 | [
[
"Ragos",
"Omiros",
""
],
[
"Haranas",
"Ioannis",
""
],
[
"Gkigkitzis",
"Ioannis",
""
]
] | We study the motion of a secondary celestial body under the influence of the logarithmic corrected gravitational force of a primary one. This kind of correction was introduced by Fabris et al. (2009). We derive two equations to compute the rate of change of the periastron w.r.t. the eccentric anomaly and its total vari... |
gr-qc/9807066 | Valerio Faraoni | Valerio Faraoni | Does the non-minimal coupling of the scalar field improve or destroy
inflation ? | 7 pages, LaTeX, no figures, to appear in Proceedings of the 7th
Canadian Conference on General Relativity and Relativistic Astrophysics
(Calgary, Canada 1997) | null | null | null | gr-qc astro-ph | null | The non-minimal coupling of a scalar field to the Ricci curvature in a curved
spacetime is unavoidable according to several authors. The coupling constant is
not a free parameter: the prescriptions for the value of the coupling constant
in specific scalar field and gravity theories (in particular in general
relativit... | [
{
"created": "Thu, 23 Jul 1998 10:42:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Faraoni",
"Valerio",
""
]
] | The non-minimal coupling of a scalar field to the Ricci curvature in a curved spacetime is unavoidable according to several authors. The coupling constant is not a free parameter: the prescriptions for the value of the coupling constant in specific scalar field and gravity theories (in particular in general relativity)... |
1408.2973 | Parthapratim Pradhan | Parthapratim Pradhan | Surface Area Products for Kerr-Taub-NUT Space-time | Version accepted for publication in EPL | EPL, Volume 115, Number 3, August 2016 | 10.1209/0295-5075/115/30003 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine properties of the inner and outer horizon thermodynamics of
Taub-NUT (Newman-Unti-Tamburino) and Kerr-Taub-NUT (KTN) black hole (BH) in
four dimensional \emph{Lorentzian geometry}. We compare and contrasted these
properties with the properties of Reissner Nordstr{\o}m (RN) BH and Kerr BH. We
focus on "area... | [
{
"created": "Wed, 13 Aug 2014 11:02:26 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2016 12:35:29 GMT",
"version": "v2"
}
] | 2016-09-14 | [
[
"Pradhan",
"Parthapratim",
""
]
] | We examine properties of the inner and outer horizon thermodynamics of Taub-NUT (Newman-Unti-Tamburino) and Kerr-Taub-NUT (KTN) black hole (BH) in four dimensional \emph{Lorentzian geometry}. We compare and contrasted these properties with the properties of Reissner Nordstr{\o}m (RN) BH and Kerr BH. We focus on "area p... |
gr-qc/0010031 | Daniele Oriti | Daniele Oriti and Ruth M. Williams | Gluing 4-simplices: a derivation of the Barrett-Crane spin foam model
for Euclidean quantum gravity | 26 pages, 7 figures; revised version: minor changes; to appear on
Phys. Rev. D | Phys.Rev. D63 (2001) 024022 | 10.1103/PhysRevD.63.024022 | null | gr-qc hep-th | null | We derive the the Barrett-Crane spin foam model for Euclidean 4 dimensional
quantum gravity from a discretized BF theory, imposing the constraints that
reduce it to gravity at the quantum level. We obtain in this way a precise
prescription of the form of the Barrett-Crane state sum, in the general case of
an arbitrar... | [
{
"created": "Mon, 9 Oct 2000 16:12:26 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2000 18:05:52 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Oriti",
"Daniele",
""
],
[
"Williams",
"Ruth M.",
""
]
] | We derive the the Barrett-Crane spin foam model for Euclidean 4 dimensional quantum gravity from a discretized BF theory, imposing the constraints that reduce it to gravity at the quantum level. We obtain in this way a precise prescription of the form of the Barrett-Crane state sum, in the general case of an arbitrary ... |
0811.1676 | Alnadhief H. A. Alfedeel | Charles Hellaby and Alnadhief H. A. Alfedeel | Solving the Observer Metric | null | Phys.Rev.D79:043501,2009 | 10.1103/PhysRevD.79.043501 | UCT-Cosmology-2008-11-11 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analysis of modern cosmological data is becoming an increasingly
important task as the amount of data multiplies. An important goal is to
extract geometric information, i.e. the metric of the cosmos, from
observational data. The observer metric is adapted to the reality of
observations: information received along... | [
{
"created": "Tue, 11 Nov 2008 10:39:39 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 2009 08:17:03 GMT",
"version": "v2"
}
] | 2009-02-20 | [
[
"Hellaby",
"Charles",
""
],
[
"Alfedeel",
"Alnadhief H. A.",
""
]
] | The analysis of modern cosmological data is becoming an increasingly important task as the amount of data multiplies. An important goal is to extract geometric information, i.e. the metric of the cosmos, from observational data. The observer metric is adapted to the reality of observations: information received along t... |
1701.03797 | Eric Van Oeveren | Eric D. Van Oeveren and John L. Friedman | Upper limit set by causality on the tidal deformability of a neutron
star | 24 pages, 10 figures. Updated to more closely reflect published
version | Phys. Rev. D 95, 083014 (2017) | 10.1103/PhysRevD.95.083014 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A principal goal of gravitational-wave astronomy is to constrain the neutron
star equation of state (EOS) by measuring the tidal deformability of neutron
stars. The tidally induced departure of the waveform from that of
point-particle (or spinless binary black hole (BBH)) increases with the
stiffness of the EOS. We s... | [
{
"created": "Fri, 13 Jan 2017 19:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2017 18:52:26 GMT",
"version": "v2"
}
] | 2017-05-05 | [
[
"Van Oeveren",
"Eric D.",
""
],
[
"Friedman",
"John L.",
""
]
] | A principal goal of gravitational-wave astronomy is to constrain the neutron star equation of state (EOS) by measuring the tidal deformability of neutron stars. The tidally induced departure of the waveform from that of point-particle (or spinless binary black hole (BBH)) increases with the stiffness of the EOS. We sho... |
gr-qc/0302040 | M. Blagojevic | M. Blagojevic | Three lectures on Poincare gauge theory | 18 pages, LaTeX, 2 figures; based on lectures presented at II Summer
School in Modern Mathematical Physics, Kopaonik, Yugoslavia, 1-12 September,
2002 | SFIN A1:147-172,2003 | null | null | gr-qc hep-th | null | In these lectures we review the basic structure of Poincare gauge theory of
gravity, with emphasis on its fundamental principles and geometric
interpretation. A specific limit of this theory, defined by the teleparallel
geometry of spacetime, is discussed as a viable alternative for the description
of macroscopic gra... | [
{
"created": "Tue, 11 Feb 2003 11:58:49 GMT",
"version": "v1"
}
] | 2011-01-17 | [
[
"Blagojevic",
"M.",
""
]
] | In these lectures we review the basic structure of Poincare gauge theory of gravity, with emphasis on its fundamental principles and geometric interpretation. A specific limit of this theory, defined by the teleparallel geometry of spacetime, is discussed as a viable alternative for the description of macroscopic gravi... |
gr-qc/0010006 | Manasse R. Mbonye | Manasse R. Mbonye (University of Michigan) and Ronald L. Mallett
(University of Connecticut) | Gravitational Perturbations of a Radiating Spacetime | Prepared for Foundations of Physics Festschrift in honor of Kurt
Haller | Found.Phys.30:747-774,2000 | 10.1023/A:1003789027892 | null | gr-qc | null | This paper discusses the problem of gravitational perturbations of radiating
spacetimes. We lay out the theoretical framework for describing the interaction
of external gravitational fields with a radiating spacetime. This is done by
deriving the field perturbation equations for a radiating metric. The equations
are ... | [
{
"created": "Tue, 3 Oct 2000 20:28:38 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Mbonye",
"Manasse R.",
"",
"University of Michigan"
],
[
"Mallett",
"Ronald L.",
"",
"University of Connecticut"
]
] | This paper discusses the problem of gravitational perturbations of radiating spacetimes. We lay out the theoretical framework for describing the interaction of external gravitational fields with a radiating spacetime. This is done by deriving the field perturbation equations for a radiating metric. The equations are th... |
1503.00860 | Vladimir Ivashchuk | V. D. Ivashchuk and A. A. Kobtsev | On exponential cosmological type solutions in the model with
Gauss-Bonnet term and variation of gravitational constant | 21 pages, 12 figures, LaTex; eq. (2.1) is modified, several sentences
are added, a typo in eq. (3.13) is eliminated | Eur. Phys. J. C (2015) 75: 177 | 10.1140/epjc/s10052-015-3394-9 | IGC-PFUR/15-02-01-rev-cor | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A D-dimensional gravitational model with Gauss-Bonnet term is considered.
When ansatz with diagonal cosmological type metrics is adopted, we find
solutions with exponential dependence of scale factors (with respect to
"synchronous-like" variable) which describe an exponential expansion of "our"
3-dimensional factor-s... | [
{
"created": "Tue, 3 Mar 2015 09:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2015 20:21:43 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Oct 2016 16:44:54 GMT",
"version": "v3"
}
] | 2016-10-04 | [
[
"Ivashchuk",
"V. D.",
""
],
[
"Kobtsev",
"A. A.",
""
]
] | A D-dimensional gravitational model with Gauss-Bonnet term is considered. When ansatz with diagonal cosmological type metrics is adopted, we find solutions with exponential dependence of scale factors (with respect to "synchronous-like" variable) which describe an exponential expansion of "our" 3-dimensional factor-spa... |
2302.03001 | Demosthenes Kazanas | Demosthenes Kazanas, Demetrios Papadopoulos and Dimitris Christodoulou | Gravity Beyond Einstein? Yes, but in Which Direction? | 13 pages, 2 figures, published in Philosophical Transactions of the
Royal Society A | Phil. Trans. R. Soc. A380, 2021 0367 | 10.1098/rsta.2021.0367 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present qualitative arguments in favor of an extension of the theory of
the gravitational interaction beyond that resulting from the Hilbert-Einstein
action. To this end we consider a locally conformal invariant theory of
gravity, discussed some thirty years ago by Mannheim and Kazanas. We discuss
its exact soluti... | [
{
"created": "Mon, 6 Feb 2023 18:36:39 GMT",
"version": "v1"
}
] | 2023-02-07 | [
[
"Kazanas",
"Demosthenes",
""
],
[
"Papadopoulos",
"Demetrios",
""
],
[
"Christodoulou",
"Dimitris",
""
]
] | We present qualitative arguments in favor of an extension of the theory of the gravitational interaction beyond that resulting from the Hilbert-Einstein action. To this end we consider a locally conformal invariant theory of gravity, discussed some thirty years ago by Mannheim and Kazanas. We discuss its exact solution... |
gr-qc/9508006 | J. Socorro Garcia D. | J.A. Nieto | From a Relativistic Point Particle to String Theory | 12 pages, no figures, file in TEX. E-mail: nie@zeus.ccu.umich.mx | Mod.Phys.Lett. A10 (1995) 3087-3096 | 10.1142/S0217732395003239 | IFUG-95-N1 | gr-qc | null | Using a classical action associated to a point-particle in (1+1)-dimensions
the classical string theory is derived. In connection with this result two
aspects are clarified: First, the point particle in (1+1)-dimensions is not an
ordinary relativistic system, but rather a some kind of a relativistic top; and
second, ... | [
{
"created": "Thu, 3 Aug 1995 22:24:00 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Nieto",
"J. A.",
""
]
] | Using a classical action associated to a point-particle in (1+1)-dimensions the classical string theory is derived. In connection with this result two aspects are clarified: First, the point particle in (1+1)-dimensions is not an ordinary relativistic system, but rather a some kind of a relativistic top; and second, th... |
0911.4808 | Kayoomars Karami | K. Karami | Comment on "Interacting holographic dark energy model and generalized
second law of thermodynamics in a non-flat universe", by M.R. Setare (JCAP
01, 023, 2007) | 3 pages | JCAP 1001:015,2010 | 10.1088/1475-7516/2010/01/015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Author of Ref. [1], M.R. Setare (JCAP 01, 023, 2007, arXiv:hep-th/0701242),
by redefining the event horizon measured from the sphere of the horizon as the
system's IR cut-off for an interacting holographic dark energy model in a
non-flat universe, showed that the generalized second law of thermodynamics is
satisfied ... | [
{
"created": "Wed, 25 Nov 2009 10:53:16 GMT",
"version": "v1"
}
] | 2010-04-23 | [
[
"Karami",
"K.",
""
]
] | Author of Ref. [1], M.R. Setare (JCAP 01, 023, 2007, arXiv:hep-th/0701242), by redefining the event horizon measured from the sphere of the horizon as the system's IR cut-off for an interacting holographic dark energy model in a non-flat universe, showed that the generalized second law of thermodynamics is satisfied fo... |
1408.4427 | Joan Sola | Joan Sola | Dark matter, dark energy and the time evolution of masses in the
Universe | Published in Int.J.Mod.Phys. A29 (2014) 2, 1444016. arXiv admin note:
substantial text overlap with arXiv:1402.4106 | null | 10.1142/S0217751X14440163 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The traditional "explanation" for the observed acceleration of the universe
is the existence of a positive cosmological constant. However, this can hardly
be a truly convincing explanation, as an expanding universe is not expected to
have a static vacuum energy density. So, it must be an approximation. This
reminds u... | [
{
"created": "Tue, 19 Aug 2014 18:54:00 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Sep 2014 07:34:25 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Sola",
"Joan",
""
]
] | The traditional "explanation" for the observed acceleration of the universe is the existence of a positive cosmological constant. However, this can hardly be a truly convincing explanation, as an expanding universe is not expected to have a static vacuum energy density. So, it must be an approximation. This reminds us ... |
2209.09684 | Artur Alho | Artur Alho, Claes Uggla, John Wainwright | Quintessence from a state space perspective | v1. 31 pages, 22 figures; v2. 32 pages, title slightly changed and
abstract extended to match version to be published | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use dynamical systems methods to study quintessence models in a spatially
flat and isotropic spacetime with matter and a scalar field with potentials for
which $\lambda(\varphi)=-V_{,\varphi}/V$ is bounded, thereby going beyond the
exponential potential for which $\lambda(\varphi)$ is constant. The scalar
field eq... | [
{
"created": "Tue, 20 Sep 2022 12:37:56 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2022 16:04:59 GMT",
"version": "v2"
}
] | 2022-12-08 | [
[
"Alho",
"Artur",
""
],
[
"Uggla",
"Claes",
""
],
[
"Wainwright",
"John",
""
]
] | We use dynamical systems methods to study quintessence models in a spatially flat and isotropic spacetime with matter and a scalar field with potentials for which $\lambda(\varphi)=-V_{,\varphi}/V$ is bounded, thereby going beyond the exponential potential for which $\lambda(\varphi)$ is constant. The scalar field equa... |
2001.10042 | Abolhassan Mohammadi | Abolhassan Mohammadi, Tayeb Golanbari, Haidar Sheikhahmadi, Kosar
Sayar, Lila Akhtari, M. A. Rasheed, Khaled Saaidi | Warm Tachyon Inflation and Swampland Criteria | 14 pages, 11 figures, Submitted to Chinese Physics C | Chinese Physics C, 44 (2020) | 10.1088/1674-1137/44/9/095101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scenario of two components warm tachyon inflation is considered where the
tachyon field plays the role of inflaton and drives inflation. During
inflation, the tachyon scalar field interacts with the other component of the
Universe which is considered as photon gas, i.e. radiation. The interacting
term contains a ... | [
{
"created": "Mon, 27 Jan 2020 19:57:28 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2020 01:15:12 GMT",
"version": "v2"
}
] | 2020-07-02 | [
[
"Mohammadi",
"Abolhassan",
""
],
[
"Golanbari",
"Tayeb",
""
],
[
"Sheikhahmadi",
"Haidar",
""
],
[
"Sayar",
"Kosar",
""
],
[
"Akhtari",
"Lila",
""
],
[
"Rasheed",
"M. A.",
""
],
[
"Saaidi",
"Khaled",
""
]... | The scenario of two components warm tachyon inflation is considered where the tachyon field plays the role of inflaton and drives inflation. During inflation, the tachyon scalar field interacts with the other component of the Universe which is considered as photon gas, i.e. radiation. The interacting term contains a di... |
1804.02983 | Hooman Moradpour | M. Tavayef, A. Sheykhi, Kazuharu Bamba, H. Moradpour | Tsallis Holographic Dark Energy | 6 pages, 4 figures, accepted version by PLB | PLB (2018) | 10.1016/j.physletb.2018.04.001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Employing the modified entropy-area relation suggested by Tsallis and Cirto
\cite{non3}, and the holographic hypothesis, a new holographic dark energy
(HDE) model is proposed. Considering a flat Friedmann-Robertson-Walker (FRW)
universe in which there is no interaction between the cosmos sectors, the
cosmic implicati... | [
{
"created": "Sun, 1 Apr 2018 20:27:53 GMT",
"version": "v1"
}
] | 2018-04-19 | [
[
"Tavayef",
"M.",
""
],
[
"Sheykhi",
"A.",
""
],
[
"Bamba",
"Kazuharu",
""
],
[
"Moradpour",
"H.",
""
]
] | Employing the modified entropy-area relation suggested by Tsallis and Cirto \cite{non3}, and the holographic hypothesis, a new holographic dark energy (HDE) model is proposed. Considering a flat Friedmann-Robertson-Walker (FRW) universe in which there is no interaction between the cosmos sectors, the cosmic implication... |
2002.00396 | Zhi-Chao Zhao | Sai Wang, Zhi-Chao Zhao | Tests of CPT invariance in gravitational waves with LIGO-Virgo catalog
GWTC-1 | 6 pages, 2 columns, 2 figures, 1 table. Moderate revision. To appear
in EPJC | null | 10.1140/epjc/s10052-020-08628-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A discovery of gravitational waves from binary black holes raises a
possibility that measurements of them can provide strict tests of CPT
invariance in gravitational waves. When CPT violation exists, if any,
gravitational waves with different circular polarizations could gain a slight
difference in propagating speeds... | [
{
"created": "Sun, 2 Feb 2020 14:04:27 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2020 12:55:04 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Nov 2020 03:26:31 GMT",
"version": "v3"
}
] | 2020-11-05 | [
[
"Wang",
"Sai",
""
],
[
"Zhao",
"Zhi-Chao",
""
]
] | A discovery of gravitational waves from binary black holes raises a possibility that measurements of them can provide strict tests of CPT invariance in gravitational waves. When CPT violation exists, if any, gravitational waves with different circular polarizations could gain a slight difference in propagating speeds. ... |
gr-qc/0402042 | Antony Searle | Susan M Scott, Antony C Searle, Benedict J Cusack and David E
McClelland | The ACIGA Data Analysis programme | 10 pages, 0 figures, accepted, Classical and Quantum Gravity,
(Proceedings of the 5th Edoardo Amaldi Conference on Gravitational Waves,
Tirrenia, Pisa, Italy, 6-11 July 2003) | Class.Quant.Grav. 21 (2004) S853-S856 | 10.1088/0264-9381/21/5/071 | null | gr-qc | null | The Data Analysis programme of the Australian Consortium for Interferometric
Gravitational Astronomy (ACIGA) was set up in 1998 by the first author to
complement the then existing ACIGA programmes working on suspension systems,
lasers and optics, and detector configurations. The ACIGA Data Analysis
programme continue... | [
{
"created": "Tue, 10 Feb 2004 00:50:10 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Scott",
"Susan M",
""
],
[
"Searle",
"Antony C",
""
],
[
"Cusack",
"Benedict J",
""
],
[
"McClelland",
"David E",
""
]
] | The Data Analysis programme of the Australian Consortium for Interferometric Gravitational Astronomy (ACIGA) was set up in 1998 by the first author to complement the then existing ACIGA programmes working on suspension systems, lasers and optics, and detector configurations. The ACIGA Data Analysis programme continues ... |
2406.02695 | Haroldo Cilas Duarte Lima Junior | Pedro L. Brito de S\'a, Haroldo C. D. Lima Jr., Carlos A. R. Herdeiro
and Lu\'is C. B. Crispino | Static boson stars in the Einstein-Friedberg-Lee-Sirlin theory and their
astrophysical images | 16 pages, 13 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the static boson star solutions in the so-called
Einstein-Friedberg-Lee-Sirlin (E-FLS) theory, performing a complete analysis of
the solution space in this model. We study the phenomenological aspects of
E-FLS stars, for instance, by investigating the timelike and null geodesics
with an emphasis on the... | [
{
"created": "Tue, 4 Jun 2024 18:13:57 GMT",
"version": "v1"
}
] | 2024-06-06 | [
[
"de Sá",
"Pedro L. Brito",
""
],
[
"Lima",
"Haroldo C. D.",
"Jr."
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Crispino",
"Luís C. B.",
""
]
] | We investigate the static boson star solutions in the so-called Einstein-Friedberg-Lee-Sirlin (E-FLS) theory, performing a complete analysis of the solution space in this model. We study the phenomenological aspects of E-FLS stars, for instance, by investigating the timelike and null geodesics with an emphasis on the a... |
1905.05204 | Vitor Cardoso | Laura Bernard, Vitor Cardoso, Taishi Ikeda, Miguel Zilhao | The physics of black hole binaries: geodesics, relaxation modes and
energy extraction | 6 pages, RevTex4. v2: Addition of Supplemental Material, with
substantial further evidence for the universality of binary ringdown, and
convergence studies of our numerical results. Accepted in Physical Review D | Phys. Rev. D 100, 044002 (2019) | 10.1103/PhysRevD.100.044002 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes are the simplest macroscopic objects, and provide unique tests of
General Relativity. They have been compared to the Hydrogen atom in quantum
mechanics. Here, we establish a few facts about the simplest systems bound by
gravity: black hole binaries. We provide strong evidence for the existence of
`global'... | [
{
"created": "Mon, 13 May 2019 18:00:05 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2019 06:36:33 GMT",
"version": "v2"
}
] | 2019-08-07 | [
[
"Bernard",
"Laura",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Ikeda",
"Taishi",
""
],
[
"Zilhao",
"Miguel",
""
]
] | Black holes are the simplest macroscopic objects, and provide unique tests of General Relativity. They have been compared to the Hydrogen atom in quantum mechanics. Here, we establish a few facts about the simplest systems bound by gravity: black hole binaries. We provide strong evidence for the existence of `global' p... |
gr-qc/0006107 | Carlo Rovelli | Alejandro Perez, Carlo Rovelli | A spin foam model without bubble divergences | 19 pages | Nucl.Phys.B599:255-282,2001 | 10.1016/S0550-3213(01)00030-X | null | gr-qc | null | We present a spin foam model in which the fundamental ``bubble amplitudes''
(the analog of the one-loop corrections in quantum field theory) are finite as
the cutoff is removed. The model is a natural variant of the field theoretical
formulation of the Barrett-Crane model. As the last, the model is a quantum BF
theor... | [
{
"created": "Thu, 29 Jun 2000 17:45:37 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 2000 13:44:57 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Perez",
"Alejandro",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We present a spin foam model in which the fundamental ``bubble amplitudes'' (the analog of the one-loop corrections in quantum field theory) are finite as the cutoff is removed. The model is a natural variant of the field theoretical formulation of the Barrett-Crane model. As the last, the model is a quantum BF theory ... |
gr-qc/0612017 | Sergei Kopeikin | Sergei Kopeikin (University of Missouri-Columbia, USA) and Igor Vlasov
(University of Guelph, Canada) | The Effacing Principle in the Post-Newtonian Celestial Mechanics | 3 pages, to apper in Proc. of 11th Marcel Grssmann Meeting (Berlin,
July 23-30, 2006) | Proc. 11th Marcel Grossmann Meeting, Eds. H. Kleinert, R.T.
Jantzen, R. Ruffini. part C, pp. 2475-2477 (Singapore: World Scientific 2008) | null | null | gr-qc | null | First post-Newtonian (PN) approximation of the scalar-tensor theory of
gravity is used to discuss the effacing principle in N-body system, that is
dependence of equations of motion of spherically-symmetric bodies comprising
the system on their internal structure. We demonstrate that the effacing
principle is violated... | [
{
"created": "Sat, 2 Dec 2006 22:08:36 GMT",
"version": "v1"
}
] | 2009-02-04 | [
[
"Kopeikin",
"Sergei",
"",
"University of Missouri-Columbia, USA"
],
[
"Vlasov",
"Igor",
"",
"University of Guelph, Canada"
]
] | First post-Newtonian (PN) approximation of the scalar-tensor theory of gravity is used to discuss the effacing principle in N-body system, that is dependence of equations of motion of spherically-symmetric bodies comprising the system on their internal structure. We demonstrate that the effacing principle is violated b... |
gr-qc/0406061 | Cherubini Christian | Donato Bini, Christian Cherubini, Bahram Mashhoon | Spin, Acceleration and Gravity | Submitted to CQG | Class.Quant.Grav. 21 (2004) 3893-3908 | 10.1088/0264-9381/21/16/005 | null | gr-qc hep-th | null | The massless field perturbations of the accelerating Minkowski and
Schwarzschild spacetimes are studied. The results are extended to the
propagation of the Proca field in Rindler spacetime. We examine critically the
possibility of existence of a general spin-acceleration coupling in complete
analogy with the well-kno... | [
{
"created": "Mon, 14 Jun 2004 15:09:17 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bini",
"Donato",
""
],
[
"Cherubini",
"Christian",
""
],
[
"Mashhoon",
"Bahram",
""
]
] | The massless field perturbations of the accelerating Minkowski and Schwarzschild spacetimes are studied. The results are extended to the propagation of the Proca field in Rindler spacetime. We examine critically the possibility of existence of a general spin-acceleration coupling in complete analogy with the well-known... |
1903.11398 | Carlos Vigh | Diego Julio Cirilo-Lombardo and Carlos Vigh | Einstein-Born-Infeld gravastar models, dark matter and accretion
mechanisms | 27 pages, 14 figures. arXiv admin note: text overlap with
arXiv:0905.1355, arXiv:gr-qc/0611083 by other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravastar models have recently been proposed as an alternative to black
holes, mainly to avoid the pro\-ble\-ma\-tic issues associated with event
horizons and singularities. In this work, a regular variety of gravastar models
within the context of Einstein-Born-Infeld (EBI) nonlinear electrodynamics are
builded. Thes... | [
{
"created": "Tue, 26 Mar 2019 05:56:16 GMT",
"version": "v1"
}
] | 2019-03-28 | [
[
"Cirilo-Lombardo",
"Diego Julio",
""
],
[
"Vigh",
"Carlos",
""
]
] | Gravastar models have recently been proposed as an alternative to black holes, mainly to avoid the pro\-ble\-ma\-tic issues associated with event horizons and singularities. In this work, a regular variety of gravastar models within the context of Einstein-Born-Infeld (EBI) nonlinear electrodynamics are builded. These ... |
2301.06563 | Vilson T. Zanchin | Angel D. D. Masa, Jos\'e P. S. Lemos, and Vilson T. Zanchin | Stability of electrically charged stars, regular black holes, quasiblack
holes, and quasinonblack holes | 38 pages, 15 figures, 18 tables | Phys. Rev. D 107, 064053 (2023) | 10.1103/PhysRevD.107.064053 | null | gr-qc astro-ph.HE astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stability of a class of electrically charged fluid spheres under radial
perturbations is studied. Among these spheres there are regular stars,
overcharged tension stars, regular black holes, quasiblack holes, and
quasinonblack holes, all of which have a Reissner-Nordstr\"om exterior. We
formulate the dynamical pe... | [
{
"created": "Mon, 16 Jan 2023 19:00:02 GMT",
"version": "v1"
}
] | 2023-03-31 | [
[
"Masa",
"Angel D. D.",
""
],
[
"Lemos",
"José P. S.",
""
],
[
"Zanchin",
"Vilson T.",
""
]
] | The stability of a class of electrically charged fluid spheres under radial perturbations is studied. Among these spheres there are regular stars, overcharged tension stars, regular black holes, quasiblack holes, and quasinonblack holes, all of which have a Reissner-Nordstr\"om exterior. We formulate the dynamical pert... |
1410.0206 | Abdel Nasser Tawfik | Abdel Nasser Tawfik (Egyptian Ctr. Theor. Phys., Cairo, WLCAPP, Cairo)
and Abdel Magied Diab (WLCAPP, Cairo) | Generalized Uncertainty Principle: Approaches and Applications | Invited Review Article to appear in International Journal of Modern
Physics D, 151 pages, 16 figures with 20 eps-graphs. arXiv admin note: text
overlap with arXiv:1403.5319, arXiv:0910.2808, arXiv:1205.0158 by other
authors | Int. J. Mod. Phys. D 23 (2014) 1430025 | 10.1142/S0218271814300250 | ECTP-2013-09b, WLCAPP-2013-06b | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review highlights from string theory, black hole physics and doubly
special relativity and some "thought" experiments which were suggested to probe
the shortest distance and/or the maximum momentum at the Planck scale. The
models which are designed to implement the minimal length scale and/or the
maximum momentum ... | [
{
"created": "Mon, 29 Sep 2014 22:59:58 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Nov 2014 18:31:17 GMT",
"version": "v2"
}
] | 2015-08-24 | [
[
"Tawfik",
"Abdel Nasser",
"",
"Egyptian Ctr. Theor. Phys., Cairo, WLCAPP, Cairo"
],
[
"Diab",
"Abdel Magied",
"",
"WLCAPP, Cairo"
]
] | We review highlights from string theory, black hole physics and doubly special relativity and some "thought" experiments which were suggested to probe the shortest distance and/or the maximum momentum at the Planck scale. The models which are designed to implement the minimal length scale and/or the maximum momentum in... |
0804.1098 | Guillermo A. Mena Marugan | Mercedes Martin-Benito, Luis J. Garay, Guillermo A. Mena Marugan | Hybrid Quantum Gowdy Cosmology: Combining Loop and Fock Quantizations | 5 pages; version accepted for publication in Physical Review D | Phys.Rev.D78:083516,2008 | 10.1103/PhysRevD.78.083516 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We quantize an inhomogeneous cosmological model using techniques that include
polymeric quantization. More explicitly, we construct well defined operators to
represent the constraints and find the physical Hilbert space formed by their
solutions, which reproduces the conventional Fock quantization for the
inhomogenei... | [
{
"created": "Mon, 7 Apr 2008 18:04:53 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2008 12:34:50 GMT",
"version": "v2"
}
] | 2009-02-23 | [
[
"Martin-Benito",
"Mercedes",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | We quantize an inhomogeneous cosmological model using techniques that include polymeric quantization. More explicitly, we construct well defined operators to represent the constraints and find the physical Hilbert space formed by their solutions, which reproduces the conventional Fock quantization for the inhomogeneiti... |
1808.01748 | Majid Abdollahi Zadeh | M. Abdollahi Zadeh and A. Sheykhi | Revisiting Agegraphic Dark Energy in Brans-Dicke Cosmology | 10 pages, 14 figures | null | 10.1139/cjp-2018-0846 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a spatially homogeneous and isotropic Friedmann-Robertson-Walker
(FRW) universe which is filled with agegraphic dark energy (ADE) with mutual
interaction with pressureless dark matter in the background of Brans-Dicke (BD)
theory. We consider both original and new type of agegraphic dark energy (NADE)
and f... | [
{
"created": "Mon, 6 Aug 2018 06:58:18 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2018 18:27:25 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Zadeh",
"M. Abdollahi",
""
],
[
"Sheykhi",
"A.",
""
]
] | We explore a spatially homogeneous and isotropic Friedmann-Robertson-Walker (FRW) universe which is filled with agegraphic dark energy (ADE) with mutual interaction with pressureless dark matter in the background of Brans-Dicke (BD) theory. We consider both original and new type of agegraphic dark energy (NADE) and fur... |
1803.11005 | Eli\v{s}ka Pol\'a\v{s}kov\'a | Eli\v{s}ka Pol\'a\v{s}kov\'a and Otakar Sv\'itek | Quasilocal horizons in inhomogeneous cosmological models | 20 pages, 2 figures | Class. Quantum Grav. 36 025005 (2019) | 10.1088/1361-6382/aaf77e | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate quasilocal horizons in inhomogeneous cosmological models,
specifically concentrating on the notion of a trapping horizon defined by
Hayward as a hypersurface foliated by marginally trapped surfaces. We calculate
and analyse these quasilocally defined horizons in two dynamical spacetimes
used as inhomog... | [
{
"created": "Thu, 29 Mar 2018 10:56:42 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jan 2019 13:16:42 GMT",
"version": "v2"
}
] | 2019-01-16 | [
[
"Polášková",
"Eliška",
""
],
[
"Svítek",
"Otakar",
""
]
] | We investigate quasilocal horizons in inhomogeneous cosmological models, specifically concentrating on the notion of a trapping horizon defined by Hayward as a hypersurface foliated by marginally trapped surfaces. We calculate and analyse these quasilocally defined horizons in two dynamical spacetimes used as inhomogen... |
2004.14209 | Gauranga Samanta | Nisha Godani and Gauranga C. Samanta | Traversable wormholes in $f(R)$ gravity with constant and variable
redshift functions | 28 pages, 8 figures | New Astronomy, 80 (2020) 101399 | 10.1016/j.newast.2020.101399 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper is aimed at the study of traversable wormholes in $f(R)$
gravity with a viable $f(R)$ function defined as $f(R)=R-\mu
R_c\Big(\frac{R}{R_c}\Big)^p$, where $R$ is scalar curvature, $\mu$, $R_c$ and
$p$ are constants with $\mu, R_c>0$ and $0<p<1$ \citep{Amendola}. The metric of
wormhole is dependent o... | [
{
"created": "Tue, 28 Apr 2020 05:45:52 GMT",
"version": "v1"
}
] | 2020-05-06 | [
[
"Godani",
"Nisha",
""
],
[
"Samanta",
"Gauranga C.",
""
]
] | The present paper is aimed at the study of traversable wormholes in $f(R)$ gravity with a viable $f(R)$ function defined as $f(R)=R-\mu R_c\Big(\frac{R}{R_c}\Big)^p$, where $R$ is scalar curvature, $\mu$, $R_c$ and $p$ are constants with $\mu, R_c>0$ and $0<p<1$ \citep{Amendola}. The metric of wormhole is dependent on ... |
1605.06427 | Zhi-Yong Wang | Zhi-Yong Wang, Cai-Dong Xiong, Qi Qiu, Yun-Xiang Wang, Shuang-Jin Shi | The effect of gravitational spin-orbit coupling on the circular photon
orbit in the Schwarzschild geometry | 23 pages, no figure. arXiv admin note: substantial text overlap with
arXiv:1508.02321 | Classical and Quantum Gravity 33, 115020 (2016) | 10.1088/0264-9381/33/11/115020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The (1, 0)+(0, 1) representation of the group SL(2, C) provides a
six-component spinor equivalent to the electromagnetic field tensor. By means
of the (1, 0)+(0, 1) description, one can treat the photon field in curved
spacetime via spin connection and the tetrad formalism, which is of great
advantage to study the gr... | [
{
"created": "Fri, 20 May 2016 16:34:08 GMT",
"version": "v1"
}
] | 2016-05-23 | [
[
"Wang",
"Zhi-Yong",
""
],
[
"Xiong",
"Cai-Dong",
""
],
[
"Qiu",
"Qi",
""
],
[
"Wang",
"Yun-Xiang",
""
],
[
"Shi",
"Shuang-Jin",
""
]
] | The (1, 0)+(0, 1) representation of the group SL(2, C) provides a six-component spinor equivalent to the electromagnetic field tensor. By means of the (1, 0)+(0, 1) description, one can treat the photon field in curved spacetime via spin connection and the tetrad formalism, which is of great advantage to study the grav... |
1509.08768 | Farook Rahaman | Ranjan Sharma, Shyam Das, Farook Rahaman and Gopal Chandra Shit | Gravitational collapse of a circularly symmetric star | Published in Astrophys.Space Sci. 359 (2015) 1, 40 | null | 10.1007/s10509-015-2486-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the collapse of a circularly symmetric star with outgoing
radiation in ($2+1$)-dimensional anti-de Sitter spacetime. The exterior
spacetime of the collapsing star is assumed to be described by the non-static
generalization of the Ba\~nados, Teitelboim and Zanelli [{\em Phys. Rev. Lett.}
{\bf 69} (1992)... | [
{
"created": "Sat, 26 Sep 2015 17:45:12 GMT",
"version": "v1"
}
] | 2015-09-30 | [
[
"Sharma",
"Ranjan",
""
],
[
"Das",
"Shyam",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Shit",
"Gopal Chandra",
""
]
] | We investigate the collapse of a circularly symmetric star with outgoing radiation in ($2+1$)-dimensional anti-de Sitter spacetime. The exterior spacetime of the collapsing star is assumed to be described by the non-static generalization of the Ba\~nados, Teitelboim and Zanelli [{\em Phys. Rev. Lett.} {\bf 69} (1992) 1... |
1808.00987 | Gregory B. Cook | Gregory B. Cook and Luke S. Annichiarico and Daniel J. Vickers | An unknown branch of the total-transmission modes for the Kerr-geometry | 12 pages, 12 figures | Phys. Rev. D 99, 024008 (2019) | 10.1103/PhysRevD.99.024008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational modes of the Kerr geometry include both quasinormal modes
and total-transmission modes. Sequences of these modes are parameterized by the
angular momentum of the black hole. The quasinormal and total-transmission
modes are usually distinct, having mode frequencies that are different at any
given val... | [
{
"created": "Thu, 2 Aug 2018 18:57:17 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2019 21:16:01 GMT",
"version": "v2"
}
] | 2019-01-11 | [
[
"Cook",
"Gregory B.",
""
],
[
"Annichiarico",
"Luke S.",
""
],
[
"Vickers",
"Daniel J.",
""
]
] | The gravitational modes of the Kerr geometry include both quasinormal modes and total-transmission modes. Sequences of these modes are parameterized by the angular momentum of the black hole. The quasinormal and total-transmission modes are usually distinct, having mode frequencies that are different at any given value... |
2303.02661 | Pardyumn Kumar Sahoo | Tee-How Loo, Raja Solanki, Avik De, P.K. Sahoo | $f(Q,T)$ gravity, its covariant formulation, energy conservation and
phase-space analysis | EPJC accepted version | Eur. Phys. J. C 83(3) (2023) 261 | 10.1140/epjc/s10052-023-11391-4 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the present article we analyze the matter-geometry coupled $f(Q,T)$ theory
of gravity. We offer the fully covariant formulation of the theory, with which
we construct the correct energy balance equation and employ it to conduct a
dynamical system analysis in a spatially flat
Friedmann-Lema\^{i}tre-Robertson-Walker... | [
{
"created": "Sun, 5 Mar 2023 12:40:08 GMT",
"version": "v1"
}
] | 2023-03-30 | [
[
"Loo",
"Tee-How",
""
],
[
"Solanki",
"Raja",
""
],
[
"De",
"Avik",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In the present article we analyze the matter-geometry coupled $f(Q,T)$ theory of gravity. We offer the fully covariant formulation of the theory, with which we construct the correct energy balance equation and employ it to conduct a dynamical system analysis in a spatially flat Friedmann-Lema\^{i}tre-Robertson-Walker s... |
2206.11363 | Milko Estrada | Milko Estrada | A toy model for representing regular black holes at the black string
style | I uploaded by mistake the same manuscript that in arXiv:2102.08222 | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-sa/4.0/ | We provide a way of representing a four dimensional regular black hole
geometry at the black string style. We enunciate a list of constrains in order
to that the complete five dimensional geometry to be regular. Following these
constraints were constructed both the four and the five dimensional geometries.
The assu... | [
{
"created": "Wed, 22 Jun 2022 20:26:42 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Nov 2022 12:55:56 GMT",
"version": "v2"
}
] | 2022-11-22 | [
[
"Estrada",
"Milko",
""
]
] | We provide a way of representing a four dimensional regular black hole geometry at the black string style. We enunciate a list of constrains in order to that the complete five dimensional geometry to be regular. Following these constraints were constructed both the four and the five dimensional geometries. The assumpti... |
gr-qc/9911038 | Diego F. Torres | Franz E. Schunck and Diego F. Torres | Boson stars with generic self-interactions | Revtex, 11 figures | Int.J.Mod.Phys. D9 (2000) 601-618 | 10.1142/S0218271800000608 | null | gr-qc | null | We study boson star configurations with generic, but not non-topological,
self-interaction terms, i.e. we do not restrict ourselves just to consider the
standard $\lambda |\psi|^4$ interaction but more general
U(1)-symmetry-preserving profiles. We find that when compared with the usual
potential, similar results for ... | [
{
"created": "Wed, 10 Nov 1999 13:26:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Schunck",
"Franz E.",
""
],
[
"Torres",
"Diego F.",
""
]
] | We study boson star configurations with generic, but not non-topological, self-interaction terms, i.e. we do not restrict ourselves just to consider the standard $\lambda |\psi|^4$ interaction but more general U(1)-symmetry-preserving profiles. We find that when compared with the usual potential, similar results for ma... |
2112.14545 | Telem Ibungochouba Singh | Y. Onika Laxmi, T. Ibungochouba Singh, I. Ablu MEitei | Modified entropy of Kerr-de Sitter black hole in Lorentz symmetry
violation theory | null | null | null | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | The quantum tunneling radiation of scalar particles near the event horizon of
Kerr-de Sitter black hole is investigated in three systems of coordinates
namely naive coordinate system, Painleve coordinate system and Eddington
coordinate system using Lorentz violation theory in curved space time. The
Klein-Gordon equat... | [
{
"created": "Wed, 29 Dec 2021 13:39:50 GMT",
"version": "v1"
},
{
"created": "Sat, 7 May 2022 05:45:14 GMT",
"version": "v2"
}
] | 2022-05-10 | [
[
"Laxmi",
"Y. Onika",
""
],
[
"Singh",
"T. Ibungochouba",
""
],
[
"MEitei",
"I. Ablu",
""
]
] | The quantum tunneling radiation of scalar particles near the event horizon of Kerr-de Sitter black hole is investigated in three systems of coordinates namely naive coordinate system, Painleve coordinate system and Eddington coordinate system using Lorentz violation theory in curved space time. The Klein-Gordon equatio... |
gr-qc/0011035 | Kouji Nakamura | Kouji Nakamura and Hideki Ishihara | Dynamics of a string coupled to gravitational waves II - Perturbations
propagate along an infinite Nambu-Goto string | 4 pages (2 columns), no figure, revtex with multicol.sty. To appear
in Physical Review D | Phys.Rev. D63 (2001) 127501 | 10.1103/PhysRevD.63.127501 | null | gr-qc astro-ph hep-th | null | The perturbative modes propagating along an infinite string are investigated
within the framework of the gauge invariant perturbation formalism on a
spacetime containing a self-gravitating straight string with a finite
thickness. These modes are not included in our previous analysis. We
reconstruct the perturbation f... | [
{
"created": "Thu, 9 Nov 2000 02:05:37 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2001 06:29:40 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Nakamura",
"Kouji",
""
],
[
"Ishihara",
"Hideki",
""
]
] | The perturbative modes propagating along an infinite string are investigated within the framework of the gauge invariant perturbation formalism on a spacetime containing a self-gravitating straight string with a finite thickness. These modes are not included in our previous analysis. We reconstruct the perturbation for... |
0908.1356 | Jose Edgar Madriz Aguilar | L. M. Reyes and Jose Edgar Madriz Aguilar | Quintessence interacting dark energy from induced matter theory of
gravity | 7 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the induced matter theory of gravity, we investigate the
possibility of deriving a 4D quintessential scenario where an interaction
between dark energy and dark matter is allowed, and the dark energy component
is modeled by a minimally coupled scalar field. Regarding the Ponce de Leon
metric, we foun... | [
{
"created": "Mon, 10 Aug 2009 16:43:45 GMT",
"version": "v1"
}
] | 2009-08-11 | [
[
"Reyes",
"L. M.",
""
],
[
"Aguilar",
"Jose Edgar Madriz",
""
]
] | In the context of the induced matter theory of gravity, we investigate the possibility of deriving a 4D quintessential scenario where an interaction between dark energy and dark matter is allowed, and the dark energy component is modeled by a minimally coupled scalar field. Regarding the Ponce de Leon metric, we found ... |
gr-qc/9912001 | Ulf Nilsson | W C Lim, U S Nilsson and J Wainwright | Anisotropic universes with isotropic cosmic microwave background
radiation | 7 pages, no figures | Class.Quant.Grav. 18 (2001) 5583-5590 | 10.1088/0264-9381/18/24/317 | null | gr-qc | null | We show the existence of spatially homogeneous but anisotropic cosmological
models whose cosmic microwave background temperature is exactly isotropic at
one instant of time but whose rate of expansion is highly anisotropic. The
existence of these models shows that the observation of a highly isotropic
cosmic microwav... | [
{
"created": "Wed, 1 Dec 1999 00:57:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lim",
"W C",
""
],
[
"Nilsson",
"U S",
""
],
[
"Wainwright",
"J",
""
]
] | We show the existence of spatially homogeneous but anisotropic cosmological models whose cosmic microwave background temperature is exactly isotropic at one instant of time but whose rate of expansion is highly anisotropic. The existence of these models shows that the observation of a highly isotropic cosmic microwave ... |
1703.00480 | Behzad Eslam Panah | Seyed Hossein Hendi, Mehrab Momennia, Behzad Eslam Panah, and Mir
Faizal | Nonsingular Universes in Gauss-Bonnet Gravity's Rainbow | 10 pages, 3 figures. minor corrections included | Astrophys. J. 827,153 (2016) | 10.3847/0004-637X/827/2/153 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we will study the rainbow deformation of the FRW cosmology in
both Einstein gravity and Gauss-Bonnet gravity. We will demonstrate that the
singularity in the FRW cosmology can be removed because of the rainbow
deformation of the FRW metric. We will obtain the general constraints required
for the FRW co... | [
{
"created": "Wed, 1 Mar 2017 19:54:51 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2017 06:02:50 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Apr 2017 05:43:47 GMT",
"version": "v3"
}
] | 2017-04-21 | [
[
"Hendi",
"Seyed Hossein",
""
],
[
"Momennia",
"Mehrab",
""
],
[
"Panah",
"Behzad Eslam",
""
],
[
"Faizal",
"Mir",
""
]
] | In this paper, we will study the rainbow deformation of the FRW cosmology in both Einstein gravity and Gauss-Bonnet gravity. We will demonstrate that the singularity in the FRW cosmology can be removed because of the rainbow deformation of the FRW metric. We will obtain the general constraints required for the FRW cosm... |
2302.05204 | Piotr Jaranowski | Andrzej Pisarski and Piotr Jaranowski | Banks of templates for directed and all-sky narrow-band searches of
continuous gravitational waves from spinning neutron stars with several
spindowns | LaTeX, 24 pages, 7 figures, identical to the published version | Class. Quantum Grav. 40, 225009 (2023) | 10.1088/1361-6382/acfe58 | LIGO-P2200375, VIR-1170A-22 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct efficient banks of templates suitable for searches of continuous
gravitational waves from isolated spinning neutron stars. We assume that the
search algorithm is based on the time-domain maximum-likelihood
$\mathcal{F}$-statistic and we consider narrow-band searches with several
spindown parameters inclu... | [
{
"created": "Fri, 10 Feb 2023 12:15:42 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2023 13:09:09 GMT",
"version": "v2"
}
] | 2023-10-18 | [
[
"Pisarski",
"Andrzej",
""
],
[
"Jaranowski",
"Piotr",
""
]
] | We construct efficient banks of templates suitable for searches of continuous gravitational waves from isolated spinning neutron stars. We assume that the search algorithm is based on the time-domain maximum-likelihood $\mathcal{F}$-statistic and we consider narrow-band searches with several spindown parameters include... |
2006.07719 | Munawar Karim | Munawar Karim | Auto-Stabilized Electron | null | Int. Journ. Modern Phys. A 35 (02n03) 2040024, (2020) | 10.1142/S0217751X20400242 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We include effects of self-gravitation in the self-interaction of single
electrons with the electromagnetic field. When the effect of gravitation is
included there is an inevitable cut-off of the k-vector - the upper limit is
finite. The inward pressure of the self-gravitating field balances the outward
pressure of s... | [
{
"created": "Sat, 13 Jun 2020 20:55:36 GMT",
"version": "v1"
}
] | 2020-06-16 | [
[
"Karim",
"Munawar",
""
]
] | We include effects of self-gravitation in the self-interaction of single electrons with the electromagnetic field. When the effect of gravitation is included there is an inevitable cut-off of the k-vector - the upper limit is finite. The inward pressure of the self-gravitating field balances the outward pressure of sel... |
gr-qc/0603003 | Plamen Fiziev | Plamen P. Fiziev | On the Exact Solutions of the Regge-Wheeler Equation in the
Schwarzschild Black Hole Interior | 12 pages, latex file, 5 figures, changes in the title, new section,
new comments, new references and new acknowledgments added | null | null | SU-TH0602 | gr-qc | null | We solve exactly the Regge-Wheeler equation for axial perturbations of the
Schwarzschild metric in the black hole interior in terms of Heun functions and
give a description of the spectrum and the eigenfunctions of the interior
problem. The phenomenon of attraction and repulsion of the discrete eigenvalues
of gravita... | [
{
"created": "Thu, 2 Mar 2006 18:36:52 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Mar 2006 14:29:46 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Sep 2006 18:24:24 GMT",
"version": "v3"
},
{
"created": "Mon, 11 Sep 2006 09:26:12 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Fiziev",
"Plamen P.",
""
]
] | We solve exactly the Regge-Wheeler equation for axial perturbations of the Schwarzschild metric in the black hole interior in terms of Heun functions and give a description of the spectrum and the eigenfunctions of the interior problem. The phenomenon of attraction and repulsion of the discrete eigenvalues of gravitati... |
2106.01913 | David Viennot | David Viennot | Emergent gravity and D-brane adiabatic dynamics: emergent Lorentz
connection | null | Class. Quantum Grav. 38 (2021) 245004 | 10.1088/1361-6382/ac337d | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore emergent geometry of the spacetime at the microscopic scale by
adiabatic transport of a quasi-coherent state of a fermionic string, with
quantum spacetime described by the matrix theory (BFSS matrix model). We show
that the generator of the Berry phase is the shift vector of the spacetime
foliation by spac... | [
{
"created": "Thu, 3 Jun 2021 15:03:41 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 2021 09:24:13 GMT",
"version": "v2"
}
] | 2021-12-10 | [
[
"Viennot",
"David",
""
]
] | We explore emergent geometry of the spacetime at the microscopic scale by adiabatic transport of a quasi-coherent state of a fermionic string, with quantum spacetime described by the matrix theory (BFSS matrix model). We show that the generator of the Berry phase is the shift vector of the spacetime foliation by spacel... |
1812.03924 | Hamed Barzegar | Hamed Barzegar, Piotr T. Chru\'sciel and Luc Nguyen | On the total mass of asymptotically hyperbolic manifolds | null | null | 10.4310/PAMQ.2019.v15.n2.a3 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generalising a proof by Bartnik in the asymptotically Euclidean case, we give
an elementary proof of positivity of the hyperbolic mass near the hyperbolic
space.
It is a pleasure to dedicate this work to Robert Bartnik on the occasion of
his 60th birthday.
| [
{
"created": "Mon, 10 Dec 2018 17:08:25 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Nov 2019 17:13:58 GMT",
"version": "v2"
}
] | 2021-06-21 | [
[
"Barzegar",
"Hamed",
""
],
[
"Chruściel",
"Piotr T.",
""
],
[
"Nguyen",
"Luc",
""
]
] | Generalising a proof by Bartnik in the asymptotically Euclidean case, we give an elementary proof of positivity of the hyperbolic mass near the hyperbolic space. It is a pleasure to dedicate this work to Robert Bartnik on the occasion of his 60th birthday. |
1508.02123 | Mubasher Jamil | Saqib Hussain, Mubasher Jamil | Timelike geodesics of a modified gravity black hole immersed in an
axially symmetric magnetic field | 26 pages, 18 figures, to appear in Phys. Rev. D. arXiv admin note:
text overlap with arXiv:1411.4811 | Phys. Rev. D 92, 043008 (2015) | 10.1103/PhysRevD.92.043008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the dynamics of a neutral and a charged particle around a
black hole in modified gravity immersed in magnetic field. Our focus is on the
scalar-tensor-vector theory as modified gravity. We are interested to explore
the conditions on the energy of the particle under which it can escape to
infinity after... | [
{
"created": "Mon, 10 Aug 2015 04:14:01 GMT",
"version": "v1"
}
] | 2015-08-25 | [
[
"Hussain",
"Saqib",
""
],
[
"Jamil",
"Mubasher",
""
]
] | We investigate the dynamics of a neutral and a charged particle around a black hole in modified gravity immersed in magnetic field. Our focus is on the scalar-tensor-vector theory as modified gravity. We are interested to explore the conditions on the energy of the particle under which it can escape to infinity after c... |
1509.02878 | G\'abor Zsolt T\'oth | Gabor Zsolt Toth | Weak cosmic censorship, dyonic Kerr-Newman black holes and Dirac fields | 28 pages, LaTeX, sections 2, 3 and appendix A shortened, appendix C
omitted, subsection 4.1 and references added, results unchanged | Class. Quantum Grav. 33 (2016) 115012 | 10.1088/0264-9381/33/11/115012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was investigated recently, with the aim of testing the weak cosmic
censorship conjecture, whether an extremal Kerr black hole can be converted
into a naked singularity by interaction with a massless classical Dirac test
field, and it was found that this is possible. We generalize this result to
electrically and ma... | [
{
"created": "Wed, 9 Sep 2015 18:18:46 GMT",
"version": "v1"
},
{
"created": "Thu, 5 May 2016 10:36:01 GMT",
"version": "v2"
}
] | 2016-05-06 | [
[
"Toth",
"Gabor Zsolt",
""
]
] | It was investigated recently, with the aim of testing the weak cosmic censorship conjecture, whether an extremal Kerr black hole can be converted into a naked singularity by interaction with a massless classical Dirac test field, and it was found that this is possible. We generalize this result to electrically and magn... |
1808.05699 | Alexander Isayev | A. A. Isayev | Comment on "Covariant Tolman-Oppenheimer-Volkoff equations. II. The
anisotropic case" | v1: 4 pages; v2: 5 pages, 1 table. Compared to the algorithm for
constructing solution of the TOV equations in the anisotropic case in Phys.
Rev. D \textbf{97} (2018) 124057, a new algorithm is proposed which leads to
the regularly behaved physical quantities in the interior of a compact star;
v3: matches the p... | Phys. Rev. D 98, 088503 (2018) | 10.1103/PhysRevD.98.088503 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the covariant formulation of the Tolman-Oppenheimer-Volkoff (TOV)
equations for studying the equilibrium structure of a spherically symmetric
compact star in the presence of the pressure anisotropy in the interior of a
star was presented in Phys. Rev. D \textbf{97} (2018) 124057. It was suggested
there that... | [
{
"created": "Wed, 15 Aug 2018 07:56:01 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2018 12:46:29 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Oct 2018 16:07:04 GMT",
"version": "v3"
}
] | 2018-11-07 | [
[
"Isayev",
"A. A.",
""
]
] | Recently, the covariant formulation of the Tolman-Oppenheimer-Volkoff (TOV) equations for studying the equilibrium structure of a spherically symmetric compact star in the presence of the pressure anisotropy in the interior of a star was presented in Phys. Rev. D \textbf{97} (2018) 124057. It was suggested there that t... |
0805.3952 | Jarmo M\"akel\"a Dr. | J. Makela | A Simple Quantum-Mechanical Model of Spacetime I: Microscopic Properties
of Spacetime | 36 pages. This is the first part in a series of two papers, where the
paper gr-qc/0701128 has been divided in two, and largely rewritten. This is a
completely revised version of the first part | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the first part in a series of two papers, where we consider a
specific microscopic model of spacetime. In our model Planck size quantum black
holes are taken to be the fundamental building blocks of space and time.
Spacetime is assumed to be a graph, where black holes lie on the vertices. In
this first paper ... | [
{
"created": "Mon, 26 May 2008 13:05:42 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Jul 2008 12:40:04 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Oct 2009 10:59:42 GMT",
"version": "v3"
}
] | 2009-10-21 | [
[
"Makela",
"J.",
""
]
] | This is the first part in a series of two papers, where we consider a specific microscopic model of spacetime. In our model Planck size quantum black holes are taken to be the fundamental building blocks of space and time. Spacetime is assumed to be a graph, where black holes lie on the vertices. In this first paper we... |
1206.5116 | Kluson Josef | J. Kluson | Hamiltonian Analysis of the Conformal Decomposition of the Gravitational
Field | 12 pages | null | 10.1103/PhysRevD.86.084001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This short note is devoted to the Hamiltonian formulation of the conformal
decomposition of the gravitational field that was performed in [gr-qc/0501092].
We also analyze the gauge fixed form of the theory when we fix the conformal
symmetry by imposing the condition det g=1.
| [
{
"created": "Fri, 22 Jun 2012 11:17:43 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Kluson",
"J.",
""
]
] | This short note is devoted to the Hamiltonian formulation of the conformal decomposition of the gravitational field that was performed in [gr-qc/0501092]. We also analyze the gauge fixed form of the theory when we fix the conformal symmetry by imposing the condition det g=1. |
2103.11788 | Chen Songbai | Songbai Chen, Zejun Wang, Jiliang Jing | Testing gravity of a disformal Kerr black hole in quadratic degenerate
higher-order scalar-tensor theories by quasi-periodic oscillations | 13 pages, 2 figures; Accepted by JCAP for publication | JCAP 06, 043 (2021) | 10.1088/1475-7516/2021/06/043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the relativistic precession model, we have studied frequencies of
quasi-periodic oscillations in the spacetime of a disformal Kerr black hole.
This black hole owns an extra disformal parameter and belongs to a class of
non-stealth solutions in quadratic degenerate higher-order scalar-tensor
(DHOST) theories.... | [
{
"created": "Mon, 22 Mar 2021 12:56:30 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jun 2021 07:21:35 GMT",
"version": "v2"
}
] | 2021-06-28 | [
[
"Chen",
"Songbai",
""
],
[
"Wang",
"Zejun",
""
],
[
"Jing",
"Jiliang",
""
]
] | By using the relativistic precession model, we have studied frequencies of quasi-periodic oscillations in the spacetime of a disformal Kerr black hole. This black hole owns an extra disformal parameter and belongs to a class of non-stealth solutions in quadratic degenerate higher-order scalar-tensor (DHOST) theories. O... |
2405.03019 | Matteo Bruno | Matteo Bruno | Cosmological sector of Loop Quantum Gravity: a Yang-Mills approach | 19 pages | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In this manuscript, we address the issue of the loss of SU(2) internal
symmetry in Loop Quantum Cosmology and its relationship with Loop Quantum
Gravity. Drawing inspiration from Yang-Mills theory and employing the framework
of fiber bundle theory, we successfully identify a cosmological sector for
General Relativity... | [
{
"created": "Sun, 5 May 2024 18:01:02 GMT",
"version": "v1"
}
] | 2024-05-07 | [
[
"Bruno",
"Matteo",
""
]
] | In this manuscript, we address the issue of the loss of SU(2) internal symmetry in Loop Quantum Cosmology and its relationship with Loop Quantum Gravity. Drawing inspiration from Yang-Mills theory and employing the framework of fiber bundle theory, we successfully identify a cosmological sector for General Relativity i... |
1512.09365 | Nikodem Poplawski | Nikodem J. Pop{\l}awski | Phantom dark energy from scalar$-$torsion coupling | 3 pages; published version | Mod. Phys. Lett. A 35, 2050331 (2020) | 10.1142/S0217732320503319 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a scalar field without a kinetic term in the Lagrangian density,
coupled to the covariant divergence of the torsion vector in the
Einstein$-$Cartan theory of gravity, becomes kinetic in its
general-relativistic equivalent formulation. The resulting kinetic term is
negative: such a scalar field could be a... | [
{
"created": "Thu, 31 Dec 2015 20:52:17 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 2021 18:52:54 GMT",
"version": "v2"
}
] | 2021-01-26 | [
[
"Popławski",
"Nikodem J.",
""
]
] | We show that a scalar field without a kinetic term in the Lagrangian density, coupled to the covariant divergence of the torsion vector in the Einstein$-$Cartan theory of gravity, becomes kinetic in its general-relativistic equivalent formulation. The resulting kinetic term is negative: such a scalar field could be a s... |
1503.02165 | Bipin Chandra Tewari | B.C. Tewari and Kali Charan | Gravitational collapse, shear-free anisotropic radiating star | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of exact solutions of Einstein field equations for a
shear-free spherically symmetric anisotropic fluid undergoing radial heat flow.
The interior metric fulfilled all the relevant physical and thermodynamic
conditions and matched with Vaidya exterior metric over the boundary. Initially
the interior... | [
{
"created": "Sat, 7 Mar 2015 12:42:03 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2015 18:00:58 GMT",
"version": "v2"
},
{
"created": "Sun, 13 Dec 2015 17:23:45 GMT",
"version": "v3"
},
{
"created": "Wed, 20 Jan 2016 15:17:47 GMT",
"version": "v4"
}
] | 2016-01-21 | [
[
"Tewari",
"B. C.",
""
],
[
"Charan",
"Kali",
""
]
] | We present a class of exact solutions of Einstein field equations for a shear-free spherically symmetric anisotropic fluid undergoing radial heat flow. The interior metric fulfilled all the relevant physical and thermodynamic conditions and matched with Vaidya exterior metric over the boundary. Initially the interior s... |
1705.10850 | Sukanta Bose | Sukanta Bose, Kabir Chakravarti, Luciano Rezzolla, B. S.
Sathyaprakash, Kentaro Takami | Neutron-star Radius from a Population of Binary Neutron Star Mergers | 9 pages and 7 figures | Phys. Rev. Lett. 120, 031102 (2018) | 10.1103/PhysRevLett.120.031102 | LIGO Document P1700071 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how gravitational-wave observations with advanced detectors of tens
to several tens of neutron-star binaries can measure the neutron-star radius
with an accuracy of several to a few percent, for mass and spatial
distributions that are realistic, and with none of the sources located within
100 Mpc. We achieve ... | [
{
"created": "Tue, 30 May 2017 20:13:05 GMT",
"version": "v1"
}
] | 2018-01-24 | [
[
"Bose",
"Sukanta",
""
],
[
"Chakravarti",
"Kabir",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Sathyaprakash",
"B. S.",
""
],
[
"Takami",
"Kentaro",
""
]
] | We show how gravitational-wave observations with advanced detectors of tens to several tens of neutron-star binaries can measure the neutron-star radius with an accuracy of several to a few percent, for mass and spatial distributions that are realistic, and with none of the sources located within 100 Mpc. We achieve su... |
gr-qc/0410030 | Netanel Lindner | Netanel H. Lindner and Asher Peres | Testing quantum superpositions of the gravitational field with
Bose-Einstein condensates | null | Phys.Rev.A71:024101,2005 | 10.1103/PhysRevA.71.024101 | null | gr-qc | null | We consider the gravity field of a Bose-Einstein condensate in a quantum
superposition. The gravity field then is also in a quantum superposition which
is in principle observable. Hence we have ``quantum gravity'' far away from the
so-called Planck scale.
| [
{
"created": "Thu, 7 Oct 2004 00:10:44 GMT",
"version": "v1"
}
] | 2008-11-07 | [
[
"Lindner",
"Netanel H.",
""
],
[
"Peres",
"Asher",
""
]
] | We consider the gravity field of a Bose-Einstein condensate in a quantum superposition. The gravity field then is also in a quantum superposition which is in principle observable. Hence we have ``quantum gravity'' far away from the so-called Planck scale. |
gr-qc/9504039 | Jemal Guven | Jemal Guven and Niall \'O Murchadha | The Constraints in Spherically Symmetric General Relativity III ---
Identifying the Configuration Space: $J\ne 0$ | 44 pages, Plain Tex, 2 figures available from the authors. | null | null | ICN-UNAM 95-10 | gr-qc | null | We continue our examination of the constraints in spherically symmetric
general relativity begun in I (gr-qc/9411009) and II (gr-qc/9411010). We extend
to general configurations with $J\ne 0$ the analysis of II which treated a
moment of time symmetry. We exploit the one parameter family of foliations
introduced in I ... | [
{
"created": "Mon, 24 Apr 1995 23:43:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Guven",
"Jemal",
""
],
[
"Murchadha",
"Niall Ó",
""
]
] | We continue our examination of the constraints in spherically symmetric general relativity begun in I (gr-qc/9411009) and II (gr-qc/9411010). We extend to general configurations with $J\ne 0$ the analysis of II which treated a moment of time symmetry. We exploit the one parameter family of foliations introduced in I wh... |
1605.06204 | Fredy Dubeibe | F. L. Dubeibe, F. D. Lora-Clavijo and Guillermo A. Gonz\'alez | Pseudo-Newtonian planar circular restricted 3-body problem | 11 pages, 2 figures. Accepted for publication in Physics Letters A,
In Press | Physics Letters A, 381 (6), 563-567, 2017 | 10.1016/j.physleta.2016.12.024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of the planar circular restricted three-body problem in
the context of a pseudo-Newtonian approximation. By using the
Fodor-Hoenselaers-Perj\'es procedure, we perform an expansion in the mass
potential of a static massive spherical source up to the first non-Newtonian
term, giving place to a gra... | [
{
"created": "Fri, 20 May 2016 03:22:36 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Dec 2016 16:02:39 GMT",
"version": "v2"
}
] | 2017-01-05 | [
[
"Dubeibe",
"F. L.",
""
],
[
"Lora-Clavijo",
"F. D.",
""
],
[
"González",
"Guillermo A.",
""
]
] | We study the dynamics of the planar circular restricted three-body problem in the context of a pseudo-Newtonian approximation. By using the Fodor-Hoenselaers-Perj\'es procedure, we perform an expansion in the mass potential of a static massive spherical source up to the first non-Newtonian term, giving place to a gravi... |
1612.02236 | Sven Zschocke | Sven Zschocke | Light propagation in the gravitational field of one arbitrarily moving
pointlike body in the 2PN approximation | 14 pages, 1 diagram | Phys. Rev. D 96, 049906 (2017) | 10.1103/PhysRevD.94.124007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analytical solution for the light trajectory in the near-zone of the
gravitational field of one pointlike body in arbitrary slow-motion in the
post-post-Newtonian approximation is presented in harmonic gauge. Expressions
for total light deflection and time delay are given. The presented solution is
a further step ... | [
{
"created": "Wed, 7 Dec 2016 13:21:34 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 2017 21:52:37 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Mar 2017 15:27:26 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Jun 2017 08:45:03 GMT",
"version": "v4"
},
{
"cr... | 2017-09-19 | [
[
"Zschocke",
"Sven",
""
]
] | An analytical solution for the light trajectory in the near-zone of the gravitational field of one pointlike body in arbitrary slow-motion in the post-post-Newtonian approximation is presented in harmonic gauge. Expressions for total light deflection and time delay are given. The presented solution is a further step to... |
2307.07404 | Arthur Menezes Lima | A. Lima, G. Alencar, Diego S\'aez-Chillon G\'omez | Regularizing Rotating Black Strings: a new black bounce solution | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper is devoted to a new black bounce solution that regularize
the well-known rotating black string in $3+1$ dimensions. To do so, the
procedure pointed out by Simpson-Visser is followed, which has been already
applied successfully to other static cases of black strings, with and without
electric charge.... | [
{
"created": "Fri, 14 Jul 2023 15:31:12 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Aug 2023 15:50:22 GMT",
"version": "v2"
}
] | 2023-08-21 | [
[
"Lima",
"A.",
""
],
[
"Alencar",
"G.",
""
],
[
"Gómez",
"Diego Sáez-Chillon",
""
]
] | The present paper is devoted to a new black bounce solution that regularize the well-known rotating black string in $3+1$ dimensions. To do so, the procedure pointed out by Simpson-Visser is followed, which has been already applied successfully to other static cases of black strings, with and without electric charge. T... |
1702.08145 | Bei Lok Hu | B. L. Hu | Fractal Spacetimes in Stochastic Gravity? -- Views from Anomalous
Diffusion and the Correlation Hierarchy | 16 pages. Invited talk at DICE2016 conference: "Spacetime - Matter -
Quantum Mechanics", September 2016 | null | 10.1088/1742-6596/880/1/012004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore in stochastic gravity theory whether non-Gaussian noises from the
higher order correlation functions of the stress tensor for quantum matter
fields when back-reacting on the spacetime may reveal hints of multi-scale
structures. Anomalous diffusion may depict how a test particle experiences in a
fractal spa... | [
{
"created": "Mon, 27 Feb 2017 04:47:15 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Hu",
"B. L.",
""
]
] | We explore in stochastic gravity theory whether non-Gaussian noises from the higher order correlation functions of the stress tensor for quantum matter fields when back-reacting on the spacetime may reveal hints of multi-scale structures. Anomalous diffusion may depict how a test particle experiences in a fractal space... |
gr-qc/0609100 | Juan A. Valiente-Kroon | Alfonso Garc\'ia-Parrado G\'omez-Lobo, Juan A. Valiente Kroon | Initial data sets for the Schwarzschild spacetime | 16 pages | Phys.Rev.D75:024027,2007 | 10.1103/PhysRevD.75.024027 | null | gr-qc | null | A characterisation of initial data sets for the Schwarzschild spacetime is
provided. This characterisation is obtained by performing a 3+1 decomposition
of a certain invariant characterisation of the Schwarzschild spacetime given in
terms of concomitants of the Weyl tensor. This procedure renders a set of
necessary c... | [
{
"created": "Fri, 22 Sep 2006 08:52:59 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2006 10:28:37 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Gómez-Lobo",
"Alfonso García-Parrado",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | A characterisation of initial data sets for the Schwarzschild spacetime is provided. This characterisation is obtained by performing a 3+1 decomposition of a certain invariant characterisation of the Schwarzschild spacetime given in terms of concomitants of the Weyl tensor. This procedure renders a set of necessary con... |
gr-qc/9806054 | null | Enrico Montanari (University of Ferrara and INFN sezione di Ferrara,
Italy) | On the propagation of electromagnetic radiation in the field of a plane
gravitational wave | 13 pages; revtex; accepted for publication in Class. Quantum Grav | Class.Quant.Grav. 15 (1998) 2493-2507 | 10.1088/0264-9381/15/8/024 | null | gr-qc astro-ph | null | The propagation of free electromagnetic radiation in the field of a plane
gravitational wave is investigated. A solution is found one order of
approximation beyond the limit of geometrical optics in both
transverse--traceless (TT) gauge and Fermi Normal Coordinate (FNC) system. The
results are applied to the study of... | [
{
"created": "Thu, 11 Jun 1998 08:23:40 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Montanari",
"Enrico",
"",
"University of Ferrara and INFN sezione di Ferrara,\n Italy"
]
] | The propagation of free electromagnetic radiation in the field of a plane gravitational wave is investigated. A solution is found one order of approximation beyond the limit of geometrical optics in both transverse--traceless (TT) gauge and Fermi Normal Coordinate (FNC) system. The results are applied to the study of p... |
2109.13556 | Yan-Gang Miao | Chen Lan, Yan-Gang Miao, Yi-Xiong Zang | Acoustic regular black hole in fluid and its similarity and diversity to
a conformally related black hole | v1: 27 pages, 16 figures; v2: 28 pages, 17 figures, clarifications
and references added; v3: clarifications and references added; v4: 33 pages,
clarifications and references added, final version to appear in European
Physical Journal C | Eur. Phys. J. C (2022) 82: 231 | 10.1140/epjc/s10052-022-10200-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address an interesting question in the present paper that whether the
acoustic gravity can be applied as a tool to the study of regular black holes.
For this purpose, we construct a general acoustic regular black hole in the
spherically symmetric fluid, where its regularity is verified from the
perspective of fini... | [
{
"created": "Tue, 28 Sep 2021 08:36:51 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 2021 07:00:23 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Jan 2022 08:56:11 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Mar 2022 02:46:08 GMT",
"version": "v4"
}
] | 2022-03-22 | [
[
"Lan",
"Chen",
""
],
[
"Miao",
"Yan-Gang",
""
],
[
"Zang",
"Yi-Xiong",
""
]
] | We address an interesting question in the present paper that whether the acoustic gravity can be applied as a tool to the study of regular black holes. For this purpose, we construct a general acoustic regular black hole in the spherically symmetric fluid, where its regularity is verified from the perspective of finite... |
gr-qc/0607052 | Jorge Pullin | Gustavo Dotti, Reinaldo Gleiser, Jorge Pullin | Instability of charged and rotating naked singularities | 5 Pages, RevTex, 2 figures, improved discussion of several points,
references added, to appear in Phys. Lett. B | Phys.Lett.B644:289-293,2007 | 10.1016/j.physletb.2006.12.004 | LSU-REL-071206 | gr-qc | null | We provide evidence that ``super-extremal'' black hole space-times (either
with charge larger than mass or angular momentum larger than mass), which
contain naked singularities, are unstable under linearized perturbations. This
is given by an infinite family of exact unstable solutions in the charged non
rotating cas... | [
{
"created": "Thu, 13 Jul 2006 05:35:19 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Aug 2006 18:25:29 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Oct 2006 16:53:09 GMT",
"version": "v3"
},
{
"created": "Tue, 5 Dec 2006 19:39:46 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Dotti",
"Gustavo",
""
],
[
"Gleiser",
"Reinaldo",
""
],
[
"Pullin",
"Jorge",
""
]
] | We provide evidence that ``super-extremal'' black hole space-times (either with charge larger than mass or angular momentum larger than mass), which contain naked singularities, are unstable under linearized perturbations. This is given by an infinite family of exact unstable solutions in the charged non rotating case,... |
gr-qc/0407041 | Louise Nolan | B. C. Nolan, L. V. Nolan | On isotropic cylindrically symmetric stellar models | 13 pages. To appear in Classical and Quantum Gravity | Class.Quant.Grav. 21 (2004) 3693-3704 | 10.1088/0264-9381/21/15/005 | null | gr-qc | null | We attempt to match the most general cylindrically symmetric vacuum
space-time with a Robertson-Walker interior. The matching conditions show that
the interior must be dust filled and that the boundary must be comoving.
Further, we show that the vacuum region must be polarized. Imposing the
condition that there are n... | [
{
"created": "Mon, 12 Jul 2004 10:53:51 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jul 2004 16:32:40 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Nolan",
"B. C.",
""
],
[
"Nolan",
"L. V.",
""
]
] | We attempt to match the most general cylindrically symmetric vacuum space-time with a Robertson-Walker interior. The matching conditions show that the interior must be dust filled and that the boundary must be comoving. Further, we show that the vacuum region must be polarized. Imposing the condition that there are no ... |
2004.12758 | A. Yu. Petrov | A. Yu. Petrov | Introduction to modified gravity | 81 pages, published in SpringerBriefs in Physics | null | 10.1007/978-3-030-52862-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is a collection of lecture notes on modified gravity. Various
modified gravity models formulated within the Riemannian formalism are
discussed.
| [
{
"created": "Mon, 27 Apr 2020 13:01:58 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2020 11:53:59 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Jul 2020 10:02:04 GMT",
"version": "v3"
}
] | 2020-08-03 | [
[
"Petrov",
"A. Yu.",
""
]
] | This paper is a collection of lecture notes on modified gravity. Various modified gravity models formulated within the Riemannian formalism are discussed. |
1705.06197 | Kimet Jusufi | Kimet Jusufi, \.Izzet Sakall{\i}, Ali \"Ovg\"un | Effect of Lorentz Symmetry Breaking on the Deflection of Light in a
Cosmic String Spacetime | 9 pages; Accepted for publication in Physical Review D | Phys. Rev. D 96, 024040 (2017) | 10.1103/PhysRevD.96.024040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Lorentz symmetry breaking effects (LSBE) on the deflection
of light by a rotating cosmic string spacetime in the weak limit approximation.
We first calculate the deflection angle by a static cosmic string for a fixed
spacelike 4-vector case (FSL) with the corresponding effective-string optical
metr... | [
{
"created": "Wed, 17 May 2017 15:02:09 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2017 16:29:26 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"Jusufi",
"Kimet",
""
],
[
"Sakallı",
"İzzet",
""
],
[
"Övgün",
"Ali",
""
]
] | We investigate the Lorentz symmetry breaking effects (LSBE) on the deflection of light by a rotating cosmic string spacetime in the weak limit approximation. We first calculate the deflection angle by a static cosmic string for a fixed spacelike 4-vector case (FSL) with the corresponding effective-string optical metric... |
gr-qc/9806057 | Esposito Giampiero | Giampiero Esposito | Non-Local Boundary Conditions in Euclidean Quantum Gravity | 23 pages, plain Tex. The revised version is much longer, and new
original calculations are presented in section 4 | Class.Quant.Grav. 16 (1999) 1113-1126 | 10.1088/0264-9381/16/4/002 | DSF preprint 98/20 | gr-qc | null | Non-local boundary conditions for Euclidean quantum gravity are proposed,
consisting of an integro-differential boundary operator acting on metric
perturbations. In this case, the operator P on metric perturbations is of
Laplace type, subject to non-local boundary conditions; by contrast, its
adjoint is the sum of a ... | [
{
"created": "Fri, 12 Jun 1998 06:24:29 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 1998 17:38:23 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Esposito",
"Giampiero",
""
]
] | Non-local boundary conditions for Euclidean quantum gravity are proposed, consisting of an integro-differential boundary operator acting on metric perturbations. In this case, the operator P on metric perturbations is of Laplace type, subject to non-local boundary conditions; by contrast, its adjoint is the sum of a La... |
gr-qc/0003091 | Bin Wang | Bin Wang and Elcio Abdalla | Entropy bound for a rotating system from Anti de Sitter black holes | 10 pages, Latex file | Phys.Rev. D62 (2000) 044030 | 10.1103/PhysRevD.62.044030 | null | gr-qc | null | General geodesic equations of the motion of spinning systems around the
(3+1)-dimensional and (2+1)-dimensional rotating anti-de Sitter black holes
have been obtained. Based upon these equations, we derived the entropy bound
for a rotating system from Kerr-Anti de Sitter black holes and BTZ black holes,
respectively.... | [
{
"created": "Wed, 22 Mar 2000 20:24:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Wang",
"Bin",
""
],
[
"Abdalla",
"Elcio",
""
]
] | General geodesic equations of the motion of spinning systems around the (3+1)-dimensional and (2+1)-dimensional rotating anti-de Sitter black holes have been obtained. Based upon these equations, we derived the entropy bound for a rotating system from Kerr-Anti de Sitter black holes and BTZ black holes, respectively. O... |
0807.3042 | Christian Boehmer | Christian G. Boehmer, Kevin Vandersloot | Stability of the Schwarzschild Interior in Loop Quantum Gravity | 4 pages, 4 figures; references added, minor modifications | Phys.Rev.D78:067501,2008 | 10.1103/PhysRevD.78.067501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent work, the Schwarzschild interior of a black hole was investigated,
incorporating quantum gravitational modifications due to loop quantum gravity.
The central Schwarzschild singularity was shown to be replaced by a Nariai type
universe. In this brief report we show that this interior solution is stable
with ... | [
{
"created": "Fri, 18 Jul 2008 20:03:37 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Aug 2008 20:56:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Vandersloot",
"Kevin",
""
]
] | In recent work, the Schwarzschild interior of a black hole was investigated, incorporating quantum gravitational modifications due to loop quantum gravity. The central Schwarzschild singularity was shown to be replaced by a Nariai type universe. In this brief report we show that this interior solution is stable with re... |
gr-qc/0101039 | Patrick Peter | Patrick Peter (IAP-GReCO, Paris), M. E. X. Guimaraes (IFT, Sao Paulo)
and V. C. de Andrade (IFT, Sao Paulo) | Dilatonic current-carrying cosmic strings | 10 pages, ReVTeX, 2 figures, minor typos corrected. This version to
appear in Phys. Rev. D | Phys.Rev. D67 (2003) 123509 | 10.1103/PhysRevD.67.123509 | null | gr-qc | null | We investigate the nature of ordinary cosmic vortices in some scalar-tensor
extensions of gravity. We find solutions for which the dilaton field condenses
inside the vortex core. These solutions can be interpreted as raising the
degeneracy between the eigenvalues of the effective stress-energy tensor,
namely the ener... | [
{
"created": "Wed, 10 Jan 2001 15:03:28 GMT",
"version": "v1"
},
{
"created": "Tue, 6 May 2003 17:08:13 GMT",
"version": "v2"
},
{
"created": "Fri, 23 May 2003 16:34:47 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Peter",
"Patrick",
"",
"IAP-GReCO, Paris"
],
[
"Guimaraes",
"M. E. X.",
"",
"IFT, Sao Paulo"
],
[
"de Andrade",
"V. C.",
"",
"IFT, Sao Paulo"
]
] | We investigate the nature of ordinary cosmic vortices in some scalar-tensor extensions of gravity. We find solutions for which the dilaton field condenses inside the vortex core. These solutions can be interpreted as raising the degeneracy between the eigenvalues of the effective stress-energy tensor, namely the energy... |
gr-qc/9704012 | Kirill A. Bronnikov | Kirill A. Bronnikov (VNIIMS, Moscow) | Multidimensional Cosmology with a Generalized Maxwell Field: Integrable
Cases | 6 pages, Latex. To appear in Grav. and Cosmol. v.3, No.1 (1997) | Grav.Cosmol. 3 (1997) 65-70 | null | RGS-VNIIMS-97/03 | gr-qc | null | We consider multidimensional cosmologies in even-dimensional space-times
(D=2n) containg perfect fluid and a multidimensional generalization of the
Maxwell field, preserving its conformal invariance (the F field, an n-form).
Among models with an isotropic physical 3-space some integrable cases are
found: vacuum model... | [
{
"created": "Sun, 6 Apr 1997 05:55:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bronnikov",
"Kirill A.",
"",
"VNIIMS, Moscow"
]
] | We consider multidimensional cosmologies in even-dimensional space-times (D=2n) containg perfect fluid and a multidimensional generalization of the Maxwell field, preserving its conformal invariance (the F field, an n-form). Among models with an isotropic physical 3-space some integrable cases are found: vacuum models ... |
gr-qc/0702029 | David Guarrera | David Guarrera, A. J. Hariton | Papapetrou Energy-Momentum Tensor for Chern-Simons Modified Gravity | 8 pages; typos corrected, references fixed, some calculations
shortened | Phys.Rev.D76:044011,2007 | 10.1103/PhysRevD.76.044011 | MIT-CTP 3810 | gr-qc | null | We construct a conserved, symmetric energy-momentum (pseudo-)tensor for
Chern-Simons modified gravity, thus demonstrating that the theory is Lorentz
invariant. The tensor is discussed in relation to other gravitational
energy-momentum tensors and analyzed for the Schwarzschild, Reissner-Nordstrom,
and FRW solutions. ... | [
{
"created": "Mon, 5 Feb 2007 21:46:32 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2007 18:33:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Guarrera",
"David",
""
],
[
"Hariton",
"A. J.",
""
]
] | We construct a conserved, symmetric energy-momentum (pseudo-)tensor for Chern-Simons modified gravity, thus demonstrating that the theory is Lorentz invariant. The tensor is discussed in relation to other gravitational energy-momentum tensors and analyzed for the Schwarzschild, Reissner-Nordstrom, and FRW solutions. To... |
gr-qc/0612097 | Mark Hannam | Mark Hannam, Sascha Husa, Niall \'O Murchadha, Bernd Br\"ugmann,
Jos\'e A. Gonz\'alez, Ulrich Sperhake | Where do moving punctures go? | Proceedings for 29th Spanish Relativity Meeting. Added more details
about the time-independent solution, with reference to the analytic result of
Baumgarte and Naculich | J.Phys.Conf.Ser.66:012047,2007 | 10.1088/1742-6596/66/1/012047 | null | gr-qc | null | Currently the most popular method to evolve black-hole binaries is the
``moving puncture'' method. It has recently been shown that when puncture
initial data for a Schwarzschild black hole are evolved using this method, the
numerical slices quickly lose contact with the second asymptotically flat end,
and end instead... | [
{
"created": "Fri, 15 Dec 2006 17:21:42 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Dec 2006 16:08:21 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Feb 2007 13:29:26 GMT",
"version": "v3"
}
] | 2016-08-16 | [
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
],
[
"Murchadha",
"Niall Ó",
""
],
[
"Brügmann",
"Bernd",
""
],
[
"González",
"José A.",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | Currently the most popular method to evolve black-hole binaries is the ``moving puncture'' method. It has recently been shown that when puncture initial data for a Schwarzschild black hole are evolved using this method, the numerical slices quickly lose contact with the second asymptotically flat end, and end instead o... |
2208.00012 | Robert Mann | Jerry Wu and Robert B. Mann | Multicritical Phase Transitions in Multiply Rotating Black Holes | Latex, 5 pages, 5 figures | null | 10.1088/1361-6382/acbc04 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that multi-critical points in which more than three phases coalesce
are present in multiply rotating Kerr-AdS black holes in $d$-dimensions. We
explicitly present a quadruple point for a triply rotating black hole in $d=8$
and a quintuple point for a quadruply rotating black hole in $d=10$. The
maximal number... | [
{
"created": "Fri, 29 Jul 2022 18:00:02 GMT",
"version": "v1"
}
] | 2023-03-08 | [
[
"Wu",
"Jerry",
""
],
[
"Mann",
"Robert B.",
""
]
] | We show that multi-critical points in which more than three phases coalesce are present in multiply rotating Kerr-AdS black holes in $d$-dimensions. We explicitly present a quadruple point for a triply rotating black hole in $d=8$ and a quintuple point for a quadruply rotating black hole in $d=10$. The maximal number o... |
1505.06994 | Matthew J. Lake Dr | Matthew J. Lake and Bernard Carr | The Compton-Schwarzschild correspondence from extended de Broglie
relations | 40 pages, 7 figures, 2 appendices. Published version, with additional
minor typos corrected (v3) | JHEP 11 (2015) 105 | 10.1007/JHEP11(2015)105 | null | gr-qc hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Compton wavelength gives the minimum radius within which the mass of a
particle may be localized due to quantum effects, while the Schwarzschild
radius gives the maximum radius within which the mass of a black hole may be
localized due to classial gravity. In a mass-radius diagram, the two lines
intersect near th... | [
{
"created": "Tue, 26 May 2015 15:13:20 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2015 19:27:50 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Apr 2016 11:23:15 GMT",
"version": "v3"
}
] | 2016-04-06 | [
[
"Lake",
"Matthew J.",
""
],
[
"Carr",
"Bernard",
""
]
] | The Compton wavelength gives the minimum radius within which the mass of a particle may be localized due to quantum effects, while the Schwarzschild radius gives the maximum radius within which the mass of a black hole may be localized due to classial gravity. In a mass-radius diagram, the two lines intersect near the ... |
1601.01283 | Piotr Jaranowski | Thibault Damour and Piotr Jaranowski and Gerhard Sch\"afer | Conservative dynamics of two-body systems at the fourth post-Newtonian
approximation of general relativity | Additional discussion of Fokker-type actions in Appendix A; new
references added; identical to published version; 20 pages | Phys. Rev. D 93, 084014 (2016) | 10.1103/PhysRevD.93.084014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fourth post-Newtonian (4PN) two-body dynamics has been recently tackled
by several different approaches: effective field theory, Arnowitt-Deser-Misner
Hamiltonian, action-angle-Delaunay averaging, effective-one-body, gravitational
self-force, first law of dynamics, and Fokker action. We review the
achievements of... | [
{
"created": "Wed, 6 Jan 2016 19:27:55 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2016 08:04:28 GMT",
"version": "v2"
}
] | 2016-04-28 | [
[
"Damour",
"Thibault",
""
],
[
"Jaranowski",
"Piotr",
""
],
[
"Schäfer",
"Gerhard",
""
]
] | The fourth post-Newtonian (4PN) two-body dynamics has been recently tackled by several different approaches: effective field theory, Arnowitt-Deser-Misner Hamiltonian, action-angle-Delaunay averaging, effective-one-body, gravitational self-force, first law of dynamics, and Fokker action. We review the achievements of t... |
2006.02237 | Hossein Khodabakhshi | H. Khodabakhshi, A. Giaimo, Robert B. Mann | Einstein Quartic Gravity: Shadows, Signals, and Stability | 17 pages, 8 figures. arXiv admin note: substantial text overlap with
arXiv:1801.03223 | Phys. Rev. D 102, 044038 (2020) | 10.1103/PhysRevD.102.044038 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Using a continued fraction ansatz we obtain an analytic approximation for a
spherically symmetric black hole solution to Einsteinian Quartic Gravity (EQG),
the next simplest Generalized Quasi-Topological Gravity (GQTG) after
Einsteinian Cubic Gravity (ECG). This approximate solution is valid everywhere
outside of the... | [
{
"created": "Mon, 1 Jun 2020 19:50:30 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jun 2020 05:18:22 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Aug 2020 17:55:04 GMT",
"version": "v3"
}
] | 2020-09-02 | [
[
"Khodabakhshi",
"H.",
""
],
[
"Giaimo",
"A.",
""
],
[
"Mann",
"Robert B.",
""
]
] | Using a continued fraction ansatz we obtain an analytic approximation for a spherically symmetric black hole solution to Einsteinian Quartic Gravity (EQG), the next simplest Generalized Quasi-Topological Gravity (GQTG) after Einsteinian Cubic Gravity (ECG). This approximate solution is valid everywhere outside of the h... |
1012.4758 | Manuel Calixto | M.Calixto, E. Perez-Romero, V. Aldaya | Coherent States of Accelerated Relativistic Quantum Particles, Vacuum
Radiation and the Spontaneous Breakdown of the Conformal SU(2,2) Symmetry | 25 pages, LaTeX, 3 figures. Additional information (resulting in four
extra pages) and a slight change of focus has been introduced in order to
make the line of arguments more clear. Title changed accordingly | J. Phys. A: Math. Theor. 45 (2012) 244010 | 10.1088/1751-8113/45/24/244010 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a quantum mechanical description of accelerated relativistic
particles in the framework of Coherent States (CS) of the (3+1)-dimensional
conformal group SU(2,2), with the role of accelerations played by special
conformal transformations and with the role of (proper) time translations
played by dilations. The ... | [
{
"created": "Tue, 21 Dec 2010 18:28:04 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2011 17:39:28 GMT",
"version": "v2"
}
] | 2012-06-22 | [
[
"Calixto",
"M.",
""
],
[
"Perez-Romero",
"E.",
""
],
[
"Aldaya",
"V.",
""
]
] | We give a quantum mechanical description of accelerated relativistic particles in the framework of Coherent States (CS) of the (3+1)-dimensional conformal group SU(2,2), with the role of accelerations played by special conformal transformations and with the role of (proper) time translations played by dilations. The ac... |
1510.02337 | Gamal G.L. Nashed | W. El Hanafy and G.G.L. Nashed | The Hidden Flat Like Universe II: Quasi inverse power law inflation by
$f(T)$ gravity | 11 pages, 4 figures and 1 table. Minor changes to match the published
version | Astrophysics and Space Science, 2016, Volume 361, Number 8 | 10.1007/s10509-016-2853-6 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent work, a particular class of $f(T)$ gravity, where $T$ is the
teleparallel torsion scalar, has been derived. This class has been identified
by flat-like universe (FLU) assumptions \cite{HN15}. The model is consistent
with the early cosmic inflation epoch. A quintessence potential has been
constructed from ... | [
{
"created": "Tue, 6 Oct 2015 20:51:17 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jul 2016 08:44:47 GMT",
"version": "v2"
}
] | 2016-10-19 | [
[
"Hanafy",
"W. El",
""
],
[
"Nashed",
"G. G. L.",
""
]
] | In a recent work, a particular class of $f(T)$ gravity, where $T$ is the teleparallel torsion scalar, has been derived. This class has been identified by flat-like universe (FLU) assumptions \cite{HN15}. The model is consistent with the early cosmic inflation epoch. A quintessence potential has been constructed from th... |
1006.2421 | Ethan Honda | Ethan P. Honda | Fractal boundary basins in spherically symmetric $\phi^4$ theory | 10 pages, 13 figures, 1 movie, resubmitted with additional paragraph.
Matches published version | Phys.Rev.D82:024038,2010 | 10.1103/PhysRevD.82.024038 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results are presented from numerical simulations of the flat-space nonlinear
Klein-Gordon equa- tion with an asymmetric double-well potential in spherical
symmetry. Exit criteria are defined for the simulations that are used to help
understand the boundaries of the basins of attraction for Gaussian "bubble"
initial d... | [
{
"created": "Sat, 12 Jun 2010 00:00:48 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2011 03:17:31 GMT",
"version": "v2"
}
] | 2011-06-15 | [
[
"Honda",
"Ethan P.",
""
]
] | Results are presented from numerical simulations of the flat-space nonlinear Klein-Gordon equa- tion with an asymmetric double-well potential in spherical symmetry. Exit criteria are defined for the simulations that are used to help understand the boundaries of the basins of attraction for Gaussian "bubble" initial dat... |
1109.0248 | Martin Bojowald | Martin Bojowald | Quantum gravity in the very early universe | 10 pages, plenary talk at "6th International Conference on Physics
and Astrophysics of Quark Gluon Plasma" (ICPAQGP 2010), Goa, India | Nucl.Phys.A862-863:98-103,2011 | 10.1016/j.nuclphysa.2011.05.026 | IGC-11/9-1 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity describes the gravitational field geometrically and in a
self-interacting way because it couples to all forms of energy, including its
own. Both features make finding a quantum theory difficult, yet it is important
in the high-energy regime of the very early universe. This review article
introduces... | [
{
"created": "Thu, 1 Sep 2011 18:00:39 GMT",
"version": "v1"
}
] | 2011-09-02 | [
[
"Bojowald",
"Martin",
""
]
] | General relativity describes the gravitational field geometrically and in a self-interacting way because it couples to all forms of energy, including its own. Both features make finding a quantum theory difficult, yet it is important in the high-energy regime of the very early universe. This review article introduces s... |
2206.07064 | Ivica Smoli\'c | Ana Bokuli\'c, Tajron Juri\'c, Ivica Smoli\'c | Constraints on singularity resolution by nonlinear electrodynamics | 10 pages (two columns); ver.2: several references added; ver. 3:
version accepted for publication in Physical Review D | Phys. Rev. D 106, 064020 (2022) | 10.1103/PhysRevD.106.064020 | ZTF-EP-22-02; RBI-ThPhys-2022-23 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the long standing problems is a quest for regular black hole
solutions, in which a resolution of the spacetime singularity has been achieved
by some physically reasonable, classical field, before one resorts to the
quantum gravity. The prospect of using nonlinear electromagnetic fields for
this goal has been l... | [
{
"created": "Tue, 14 Jun 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jun 2022 18:00:09 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Sep 2022 21:15:10 GMT",
"version": "v3"
}
] | 2022-09-14 | [
[
"Bokulić",
"Ana",
""
],
[
"Jurić",
"Tajron",
""
],
[
"Smolić",
"Ivica",
""
]
] | One of the long standing problems is a quest for regular black hole solutions, in which a resolution of the spacetime singularity has been achieved by some physically reasonable, classical field, before one resorts to the quantum gravity. The prospect of using nonlinear electromagnetic fields for this goal has been lim... |
1209.3763 | Hossein Farajollahi | H. Farajollahi, A. Salehi | Varying alpha and cosmic acceleration in Brans-Dicke-BSBM theory:
stability analysis and observational tests | 11 pages, 5 figures, to be published in JCAP | null | 10.1088/1475-7516/2012/11/002 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By integration of generalized BSBM and Brans-Dicke cosmological models, in
this article, we investigate the theoretical framework of fine structure
constant variation and current cosmic acceleration. We first develop a
mathematical formalism to analyse the stability of the model. By employing
observational data to co... | [
{
"created": "Sun, 16 Sep 2012 14:45:57 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Oct 2012 05:34:00 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Farajollahi",
"H.",
""
],
[
"Salehi",
"A.",
""
]
] | By integration of generalized BSBM and Brans-Dicke cosmological models, in this article, we investigate the theoretical framework of fine structure constant variation and current cosmic acceleration. We first develop a mathematical formalism to analyse the stability of the model. By employing observational data to cons... |
1309.5123 | Tiberiu Harko | M. K. Mak, T. Harko | Isotropic stars in general relativity | 12 pages, 10 figures, accepted for publication in EPJC; references
added | The European Physical Journal C, 73, 2585 (2013) | 10.1140/epjc/s10052-013-2585-5 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general solution of the Einstein gravitational field equations
for the static spherically symmetric gravitational interior spacetime of an
isotropic fluid sphere. The solution is obtained by transforming the pressure
isotropy condition, a second order ordinary differential equation, into a
Riccati type f... | [
{
"created": "Fri, 20 Sep 2013 01:04:57 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Oct 2013 07:44:15 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Mak",
"M. K.",
""
],
[
"Harko",
"T.",
""
]
] | We present a general solution of the Einstein gravitational field equations for the static spherically symmetric gravitational interior spacetime of an isotropic fluid sphere. The solution is obtained by transforming the pressure isotropy condition, a second order ordinary differential equation, into a Riccati type fir... |
1101.5492 | Nigel Bishop | Nigel Bishop, Denis Pollney and Christian Reisswig | Initial data transients in binary black hole evolutions | 18 pages, 4 figures | Class.Quant.Grav.28:155019,2011 | 10.1088/0264-9381/28/15/155019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a method for initializing characteristic evolutions of the
Einstein equations using a linearized solution corresponding to purely outgoing
radiation. This allows for a more consistent application of the characteristic
(null cone) techniques for invariantly determining the gravitational radiation
content o... | [
{
"created": "Fri, 28 Jan 2011 09:53:51 GMT",
"version": "v1"
}
] | 2015-03-18 | [
[
"Bishop",
"Nigel",
""
],
[
"Pollney",
"Denis",
""
],
[
"Reisswig",
"Christian",
""
]
] | We describe a method for initializing characteristic evolutions of the Einstein equations using a linearized solution corresponding to purely outgoing radiation. This allows for a more consistent application of the characteristic (null cone) techniques for invariantly determining the gravitational radiation content of ... |
0803.0482 | Paul Tod | Christian L\"ubbe and Paul Tod | Conformal Properties of an Evaporating Black Hole Model | null | Gen.Rel.Grav.41:7-19,2009 | 10.1007/s10714-008-0646-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a new, conformally-invariant method of analysis to test incomplete
null geodesics approaching the singularity in a model of an evaporating black
hole for the possibility of extensions of the conformal metric. In general, a
local conformal extension is possible from the future but not from the past.
| [
{
"created": "Tue, 4 Mar 2008 17:10:27 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Lübbe",
"Christian",
""
],
[
"Tod",
"Paul",
""
]
] | We use a new, conformally-invariant method of analysis to test incomplete null geodesics approaching the singularity in a model of an evaporating black hole for the possibility of extensions of the conformal metric. In general, a local conformal extension is possible from the future but not from the past. |
2303.04153 | Pardyumn Kumar Sahoo | Sneha Pradhan, Sanjay Mandal, P.K. Sahoo | Gravastar in the Framework of Symmetric Teleparallel Gravity | Chinese Physics C published version | Chinese Physics C 47(5) (2023) 055103 | 10.1088/1674-1137/acc1ce | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the current research, we present a novel gravastar model based on the
Mazur-Mottola (2004) method with an isotropic matter distribution in $f(Q)$
gravity. The gravastar, a hypothesized substitute for a black hole, is built
using the Mazur-Mottola mechanism. This approach allows us to define gravastar
as having thr... | [
{
"created": "Tue, 7 Mar 2023 06:54:33 GMT",
"version": "v1"
}
] | 2023-04-12 | [
[
"Pradhan",
"Sneha",
""
],
[
"Mandal",
"Sanjay",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In the current research, we present a novel gravastar model based on the Mazur-Mottola (2004) method with an isotropic matter distribution in $f(Q)$ gravity. The gravastar, a hypothesized substitute for a black hole, is built using the Mazur-Mottola mechanism. This approach allows us to define gravastar as having three... |
gr-qc/9702059 | S. M. Goncalves | Sergio M.C.V. Goncalves and Ian G. Moss | Black hole formation from massive scalar fields | 11 pages, RevTeX, 3 eps figures. Submitted to Class. Quantum Grav | Class.Quant.Grav. 14 (1997) 2607-2615 | 10.1088/0264-9381/14/9/015 | NCL97-TP1 | gr-qc | null | It is shown that there exists a range of parameters in which gravitational
collapse with a spherically symmetric massive scalar field can be treated as if
it were collapsing dust. This implies a criterion for the formation of black
holes depending on the size and mass of the initial field configuration and the
mass o... | [
{
"created": "Thu, 27 Feb 1997 19:39:23 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Goncalves",
"Sergio M. C. V.",
""
],
[
"Moss",
"Ian G.",
""
]
] | It is shown that there exists a range of parameters in which gravitational collapse with a spherically symmetric massive scalar field can be treated as if it were collapsing dust. This implies a criterion for the formation of black holes depending on the size and mass of the initial field configuration and the mass of ... |
2001.01903 | W{\l}odzimierz Piechocki | Nick Kwidzinski, Daniele Malafarina, Jan Ostrowski, W{\l}odzimierz
Piechocki, and Tim Schmitz | Hamiltonian formulation of dust cloud collapse | 25 pages, 1 figure; version accepted for publication in Phys. Rev. D | Phys. Rev. D 101, 104017 (2020) | 10.1103/PhysRevD.101.104017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the gravitational collapse of self-gravitating spherical dust
cloud in the Hamiltonian formalism. We address both homogeneous and
inhomogeneous cases. Our novel derivation of the Hamiltonian of the system is
based on the improved variational principle that was proposed in \cite{KMM}.
The present derivatio... | [
{
"created": "Tue, 7 Jan 2020 06:14:19 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Apr 2020 06:43:58 GMT",
"version": "v2"
}
] | 2020-05-13 | [
[
"Kwidzinski",
"Nick",
""
],
[
"Malafarina",
"Daniele",
""
],
[
"Ostrowski",
"Jan",
""
],
[
"Piechocki",
"Włodzimierz",
""
],
[
"Schmitz",
"Tim",
""
]
] | We consider the gravitational collapse of self-gravitating spherical dust cloud in the Hamiltonian formalism. We address both homogeneous and inhomogeneous cases. Our novel derivation of the Hamiltonian of the system is based on the improved variational principle that was proposed in \cite{KMM}. The present derivation ... |
1607.03382 | Sunil Kumar Tripathy Dr. | B. Mishra, S. Tarai and S. K. Tripathy | Dynamics of an Anisotropic Universe in $f(R,T)$ Theory | 16 pages, 4 figures | Advances in High Energy Physics, Vol 2016, Article ID 8543560
(2016) | 10.1155/2016/8543560 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamics of an anisotropic universe is studied in $f(R,T)$ gravity using a
rescaled functional $f(R,T)$. Three models have been constructed assuming a
power law expansion of the universe. Physical features of the models are
discussed. The model parameters are constrained from a dimensional analysis. It
is found from ... | [
{
"created": "Tue, 28 Jun 2016 05:04:38 GMT",
"version": "v1"
}
] | 2018-06-06 | [
[
"Mishra",
"B.",
""
],
[
"Tarai",
"S.",
""
],
[
"Tripathy",
"S. K.",
""
]
] | Dynamics of an anisotropic universe is studied in $f(R,T)$ gravity using a rescaled functional $f(R,T)$. Three models have been constructed assuming a power law expansion of the universe. Physical features of the models are discussed. The model parameters are constrained from a dimensional analysis. It is found from th... |
1701.00492 | Shahar Hod | Shahar Hod | A lower bound on the Bekenstein-Hawking temperature of black holes | 7 pages | Physics Letters B 759, 541 (2016) | 10.1016/j.physletb.2016.06.021 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present evidence for the existence of a quantum lower bound on the
Bekenstein-Hawking temperature of black holes. The suggested bound is supported
by a gedanken experiment in which a charged particle is dropped into a Kerr
black hole. It is proved that the temperature of the final Kerr-Newman
black-hole configurat... | [
{
"created": "Mon, 2 Jan 2017 19:00:04 GMT",
"version": "v1"
}
] | 2017-01-11 | [
[
"Hod",
"Shahar",
""
]
] | We present evidence for the existence of a quantum lower bound on the Bekenstein-Hawking temperature of black holes. The suggested bound is supported by a gedanken experiment in which a charged particle is dropped into a Kerr black hole. It is proved that the temperature of the final Kerr-Newman black-hole configuratio... |
1411.0598 | Edward Porter | Edward K. Porter | A New Method of Accelerated Bayesian Inference for Comparable Mass
Binaries in both Ground and Space-Based Gravitational Wave Astronomy | 11 pages, 4 figures, submitted to Classical and Quantum Gravity | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the advance in computational resources, Bayesian inference is
increasingly becoming the standard tool of practise in GW astronomy. However,
algorithms such as Markov Chain Monte Carlo (MCMC) require a large number of
iterations to guarantee convergence to the target density. Each chain demands a
large number of ... | [
{
"created": "Mon, 3 Nov 2014 18:41:54 GMT",
"version": "v1"
}
] | 2014-11-04 | [
[
"Porter",
"Edward K.",
""
]
] | With the advance in computational resources, Bayesian inference is increasingly becoming the standard tool of practise in GW astronomy. However, algorithms such as Markov Chain Monte Carlo (MCMC) require a large number of iterations to guarantee convergence to the target density. Each chain demands a large number of ev... |
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