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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9511067 | Sakellariadou Mairi | Julio Fabris and Mairi Sakellariadou | Density perturbations in Kaluza--Klein theories during a de Sitter phase | LaTex file, 10 pages. To be published in Classical and Quantum
Gravity | Class.Quant.Grav. 14 (1997) 725-734 | 10.1088/0264-9381/14/3/014 | null | gr-qc | null | In the context of Kaluza-Klein theories, we consider a model in which the
universe is filled with a perfect fluid described by a barotropic equation of
state. An analysis of density perturbations employing the synchronous gauge
shows that there are cases where these perturbations have an exponential growth
during a d... | [
{
"created": "Fri, 24 Nov 1995 15:24:58 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jan 1997 17:41:54 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Fabris",
"Julio",
""
],
[
"Sakellariadou",
"Mairi",
""
]
] | In the context of Kaluza-Klein theories, we consider a model in which the universe is filled with a perfect fluid described by a barotropic equation of state. An analysis of density perturbations employing the synchronous gauge shows that there are cases where these perturbations have an exponential growth during a de ... |
1702.05936 | C. Q. Geng | Wei-Xiang Feng, Chao-Qiang Geng, W.F. Kao and Ling-Wei Luo | Equation of State of Neutron Stars with Junction Conditions in the
Starobinsky Model | 18 pages, 3 figures, revised version accepted by Int. J. Mod. Phys. D | Int. J. Mod. Phys. D26 (2017) 1750186 | 10.1142/S0218271817501863 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Starobinsky or $R^2$ model of $f(R)=R+\alpha R^2$ for neutron
stars with the structure equations represented by the coupled differential
equations and the \emph{polytropic} type of the matter equation of state. The
junction conditions of $f(R)$ gravity are used as the boundary conditions to
match the Sch... | [
{
"created": "Mon, 20 Feb 2017 11:52:38 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Sep 2017 06:04:31 GMT",
"version": "v2"
}
] | 2017-10-11 | [
[
"Feng",
"Wei-Xiang",
""
],
[
"Geng",
"Chao-Qiang",
""
],
[
"Kao",
"W. F.",
""
],
[
"Luo",
"Ling-Wei",
""
]
] | We study the Starobinsky or $R^2$ model of $f(R)=R+\alpha R^2$ for neutron stars with the structure equations represented by the coupled differential equations and the \emph{polytropic} type of the matter equation of state. The junction conditions of $f(R)$ gravity are used as the boundary conditions to match the Schwa... |
gr-qc/0206017 | Neil J. Cornish | Neil Cornish and Shane Larson | LISA data analysis I: Doppler demodulation | 5 pages, 7 figures. References and new comments added | Class.Quant.Grav. 20 (2003) S163-S170 | 10.1088/0264-9381/20/10/319 | null | gr-qc | null | The orbital motion of the Laser Interferometer Space Antenna (LISA) produces
amplitude, phase and frequency modulation of a gravitational wave signal. The
modulations have the effect of spreading a monochromatic gravitational wave
signal across a range of frequencies. The modulations encode useful information
about t... | [
{
"created": "Thu, 6 Jun 2002 19:00:44 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jun 2002 23:14:57 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Cornish",
"Neil",
""
],
[
"Larson",
"Shane",
""
]
] | The orbital motion of the Laser Interferometer Space Antenna (LISA) produces amplitude, phase and frequency modulation of a gravitational wave signal. The modulations have the effect of spreading a monochromatic gravitational wave signal across a range of frequencies. The modulations encode useful information about the... |
gr-qc/9710088 | Carmen Molina-Paris | Carmen Molina-Paris | Energy-Momentum Tensor and Particle Creation in the de Sitter Universe | 3 pages, 1 figure, revtex. To appear in the proceedings of the 8th
Marcel Grossmann Meeting | null | null | null | gr-qc | null | For a quantum field in a curved background the choice of the vacuum state is
crucial. We exhibit a vacuum state in which the expectation values of the
energy and pressure allow an intuitive interpretation. We apply this general
result to the de Sitter universe.
| [
{
"created": "Sat, 18 Oct 1997 00:39:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Molina-Paris",
"Carmen",
""
]
] | For a quantum field in a curved background the choice of the vacuum state is crucial. We exhibit a vacuum state in which the expectation values of the energy and pressure allow an intuitive interpretation. We apply this general result to the de Sitter universe. |
1302.7110 | Vladimir S. Manko | V.S. Manko, R.I. Rabadan, E. Ruiz | The Breton-Manko equatorially antisymmetric binary configuration
revisited | 6 pages, 1 figure; minor improvement of presentation of functions B
and G compared to published version | CQG 30 (2013) 145005 | 10.1088/0264-9381/30/14/145005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Breton-Manko solution for two identical counter-rotating Kerr-Newman
charged masses is rewritten in the physical parametrization involving Komar
quantities. The new form of the solution turns out to be very convenient for
verifying that the black-hole sector of the Bret\'on-Manko binary configuration
saturates a ... | [
{
"created": "Thu, 28 Feb 2013 08:38:19 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2013 02:35:38 GMT",
"version": "v2"
},
{
"created": "Sun, 23 Jun 2013 20:50:56 GMT",
"version": "v3"
}
] | 2015-06-15 | [
[
"Manko",
"V. S.",
""
],
[
"Rabadan",
"R. I.",
""
],
[
"Ruiz",
"E.",
""
]
] | The Breton-Manko solution for two identical counter-rotating Kerr-Newman charged masses is rewritten in the physical parametrization involving Komar quantities. The new form of the solution turns out to be very convenient for verifying that the black-hole sector of the Bret\'on-Manko binary configuration saturates a re... |
2006.16041 | Branko Dragovich | I. Dimitrijevic, B. Dragovich, A. S. Koshelev, Z. Rakic and J.
Stankovic | Some Cosmological Solutions of a New Nonlocal Gravity Model | 13 pages | Symmetry 2020, 12, 917 | 10.3390/sym12060917 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate a nonlocal modification of general relativity
(GR) with action $S = \frac{1}{16\pi G} \int [ R- 2\Lambda + (R-4\Lambda) \,
\mathcal{F}(\Box) \, (R-4\Lambda) ] \, \sqrt{-g}\; d^4x ,$ where $\mathcal{F}
(\Box) = \sum_{n=1}^{+\infty} f_n \Box^n$ is an analytic function of the
d'Alembertian ... | [
{
"created": "Fri, 26 Jun 2020 16:55:58 GMT",
"version": "v1"
}
] | 2020-06-30 | [
[
"Dimitrijevic",
"I.",
""
],
[
"Dragovich",
"B.",
""
],
[
"Koshelev",
"A. S.",
""
],
[
"Rakic",
"Z.",
""
],
[
"Stankovic",
"J.",
""
]
] | In this paper, we investigate a nonlocal modification of general relativity (GR) with action $S = \frac{1}{16\pi G} \int [ R- 2\Lambda + (R-4\Lambda) \, \mathcal{F}(\Box) \, (R-4\Lambda) ] \, \sqrt{-g}\; d^4x ,$ where $\mathcal{F} (\Box) = \sum_{n=1}^{+\infty} f_n \Box^n$ is an analytic function of the d'Alembertian $\... |
1303.1669 | Norman G\"urlebeck | Norman G\"urlebeck | Source Integrals for Multipole Moments in Static Spacetimes | contribution to the Proceedings of the Thirteenth Marcel Grossmann
Meeting on General Relativity (Stockholm, July 1-7, 2012) | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive source integrals for multipole moments that describe the behavior
of static and axially symmetric spacetimes close to spatial infinity. We assume
that the matter distribution is isolated. We outline also some applications of
these source integrals of the asymptotic multipole moments.
| [
{
"created": "Thu, 7 Mar 2013 12:54:17 GMT",
"version": "v1"
}
] | 2013-03-08 | [
[
"Gürlebeck",
"Norman",
""
]
] | We derive source integrals for multipole moments that describe the behavior of static and axially symmetric spacetimes close to spatial infinity. We assume that the matter distribution is isolated. We outline also some applications of these source integrals of the asymptotic multipole moments. |
1212.6805 | Yun Soo Myung | Yun Soo Myung | Van Dam-Veltman-Zakharov discontinuity in topologically new massive
gravity | 1+7 pages, no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study van Dam-Veltman-Zakharov discontinuity in the topologically new
massive gravity (TNMG). The reduction from 2 degrees of freedom to one is
interpreted as van Dam-Veltman-Zakharov discontinuity appeared when going from
anti-de Sitter spacetime to Minkowski spacetime in the linearized TNMG.
| [
{
"created": "Mon, 31 Dec 2012 02:11:36 GMT",
"version": "v1"
}
] | 2013-01-01 | [
[
"Myung",
"Yun Soo",
""
]
] | We study van Dam-Veltman-Zakharov discontinuity in the topologically new massive gravity (TNMG). The reduction from 2 degrees of freedom to one is interpreted as van Dam-Veltman-Zakharov discontinuity appeared when going from anti-de Sitter spacetime to Minkowski spacetime in the linearized TNMG. |
1110.3272 | Valentin Bonzom | Valentin Bonzom and Etera R. Livine | A new Hamiltonian for the Topological BF phase with spinor networks | 40 pages | J. Math. Phys. 53, 072201 (2012) | 10.1063/1.4731771 | pi-qg-244 | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe fundamental equations which define the topological ground states
in the lattice realization of the SU(2) BF phase. We introduce a new scalar
Hamiltonian, based on recent works in quantum gravity and topological models,
which is different from the plaquette operator. Its gauge-theoretical content
at the cl... | [
{
"created": "Fri, 14 Oct 2011 17:28:43 GMT",
"version": "v1"
}
] | 2012-08-27 | [
[
"Bonzom",
"Valentin",
""
],
[
"Livine",
"Etera R.",
""
]
] | We describe fundamental equations which define the topological ground states in the lattice realization of the SU(2) BF phase. We introduce a new scalar Hamiltonian, based on recent works in quantum gravity and topological models, which is different from the plaquette operator. Its gauge-theoretical content at the clas... |
0708.3558 | Muhammad Sharif | M. Sharif and M. Jamil Amir | Teleparallel Killing Vectors of the Einstein Universe | 9 pages, accepted for publication in Mod. Phys. Lett. A | Mod.Phys.Lett.A23:963-969,2008 | 10.1142/S0217732308025474 | null | gr-qc | null | In this short paper we establish the definition of the Lie derivative of a
second rank tensor in the context of teleparallel theory of gravity and also
extend it for a general tensor of rank $p+q$. This definition is then used to
find Killing vectors of the Einstein universe. It turns out that Killing
vectors of the ... | [
{
"created": "Mon, 27 Aug 2007 09:06:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sharif",
"M.",
""
],
[
"Amir",
"M. Jamil",
""
]
] | In this short paper we establish the definition of the Lie derivative of a second rank tensor in the context of teleparallel theory of gravity and also extend it for a general tensor of rank $p+q$. This definition is then used to find Killing vectors of the Einstein universe. It turns out that Killing vectors of the Ei... |
gr-qc/0202063 | J. Alberto Lobo | J. Alberto Lobo | The detection of Gravitational Waves | 33 pages, 12 figures, LaTeX2e, Springer style files --included. For
Proceedings of the ERE-2001 Conference (Madrid, September 2001) | Lect.Notes Phys. 617 (2003) 210-241 | 10.1007/3-540-36973-2_11 | null | gr-qc astro-ph hep-ph | null | This chapter is concerned with the question: how do gravitational waves (GWs)
interact with their detectors? It is intended to be a theory review of the
fundamental concepts involved in interferometric and acoustic (Weber bar) GW
antennas. In particular, the type of signal the GW deposits in the detector in
each case... | [
{
"created": "Mon, 18 Feb 2002 17:01:40 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Lobo",
"J. Alberto",
""
]
] | This chapter is concerned with the question: how do gravitational waves (GWs) interact with their detectors? It is intended to be a theory review of the fundamental concepts involved in interferometric and acoustic (Weber bar) GW antennas. In particular, the type of signal the GW deposits in the detector in each case w... |
gr-qc/0512089 | Daniele Malafarina | J. Kijowski, G. Magli and D. Malafarina | The general solution for relativistic spherical shells | 8 pages, 8 figures | Int. J. Mod. Phys. D18: 1801,2009 | 10.1142/S0218271809014996 | null | gr-qc | null | The general exact solution of the Einstein-matter field equations describing
spherically symmetric shells satisfying an equation of state in closed form is
discussed under general assumptions of physical reasonableness. The solutions
split into two classes: a class of "astro-physically interesting" solutions
describi... | [
{
"created": "Thu, 15 Dec 2005 11:35:53 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kijowski",
"J.",
""
],
[
"Magli",
"G.",
""
],
[
"Malafarina",
"D.",
""
]
] | The general exact solution of the Einstein-matter field equations describing spherically symmetric shells satisfying an equation of state in closed form is discussed under general assumptions of physical reasonableness. The solutions split into two classes: a class of "astro-physically interesting" solutions describing... |
2205.08102 | Saugata Chatterjee | Saugata Chatterjee | Can Galileons cause violation of the second law of black hole
thermodynamics? | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Galileons are stable null energy condition (NEC) violating perturbations. If
these NEC violating modes are coupled to Einstein gravity, they can cause
violation of the second law of black hole thermodynamics. We demonstrate that
galileons can only be coupled to quadratic gravity since they are generated by
consistent... | [
{
"created": "Tue, 17 May 2022 05:40:58 GMT",
"version": "v1"
}
] | 2022-05-18 | [
[
"Chatterjee",
"Saugata",
""
]
] | Galileons are stable null energy condition (NEC) violating perturbations. If these NEC violating modes are coupled to Einstein gravity, they can cause violation of the second law of black hole thermodynamics. We demonstrate that galileons can only be coupled to quadratic gravity since they are generated by consistent K... |
1810.10754 | Lorenzo Fatibene | L.Del Vecchio, L.Fatibene, S.Capozziello, M.Ferraris, P.Pinto,
S.Camera | Hubble drift in Palatini $f(\mathcal{R})$-theories | 18 pages, 4 figures (some references added, some typos corrected) | Eur. Phys. J. Plus 134(5) (2019) | 10.1140/epjp/i2019-12382-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a Palatini $f(\mathcal{R})$-model, we define chonodynamical effects due to
the choice of atomic clocks as standard reference clocks and we develop a
formalism able to quantitatively separate them from the usual effective dark
sources one has in extended theories. We apply the formalism to Hubble drift
and briefly ... | [
{
"created": "Thu, 25 Oct 2018 08:01:21 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Nov 2018 11:19:07 GMT",
"version": "v2"
}
] | 2019-01-08 | [
[
"Del Vecchio",
"L.",
""
],
[
"Fatibene",
"L.",
""
],
[
"Capozziello",
"S.",
""
],
[
"Ferraris",
"M.",
""
],
[
"Pinto",
"P.",
""
],
[
"Camera",
"S.",
""
]
] | In a Palatini $f(\mathcal{R})$-model, we define chonodynamical effects due to the choice of atomic clocks as standard reference clocks and we develop a formalism able to quantitatively separate them from the usual effective dark sources one has in extended theories. We apply the formalism to Hubble drift and briefly di... |
1004.5317 | Yi Xie | Xin Wu (Nanchang University), Yi Xie (Nanjing University) | Resurvey of order and chaos in spinning compact binaries | 16 pages, 7 figures | Phys. Rev. D 77, 103012 (2008) | 10.1103/PhysRevD.77.103012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is mainly devoted to applying the invariant, fast, Lyapunov
indicator to clarify some doubt regarding the apparently conflicting results of
chaos in spinning compact binaries at the second-order post-Newtonian
approximation of general relativity from previous literatures. It is shown with
a number of examp... | [
{
"created": "Thu, 29 Apr 2010 15:07:26 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Wu",
"Xin",
"",
"Nanchang University"
],
[
"Xie",
"Yi",
"",
"Nanjing University"
]
] | This paper is mainly devoted to applying the invariant, fast, Lyapunov indicator to clarify some doubt regarding the apparently conflicting results of chaos in spinning compact binaries at the second-order post-Newtonian approximation of general relativity from previous literatures. It is shown with a number of example... |
2309.06894 | Mikael Normann | Mikael Normann | On a field tensor for gravity and electromagnetism | null | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We show that a three rank Lanczos type tensor field is an appropriate choice
to describe relativistic electromagnetic and gravitational effects. More
precisely, we identify the irreducible field-decompositions of this tensor as
gravitational and electromagnetic fields. A set of divergence equations are
proposed as fi... | [
{
"created": "Wed, 13 Sep 2023 11:33:30 GMT",
"version": "v1"
}
] | 2023-09-14 | [
[
"Normann",
"Mikael",
""
]
] | We show that a three rank Lanczos type tensor field is an appropriate choice to describe relativistic electromagnetic and gravitational effects. More precisely, we identify the irreducible field-decompositions of this tensor as gravitational and electromagnetic fields. A set of divergence equations are proposed as fiel... |
2210.11198 | Christof Wetterich | V.A.Rubakov, C.Wetterich | Geodesic (in)completeness in general metric frames | 18 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geometric concept of geodesic completeness depends on the choice of the
metric field or "metric frame". We develop a frame-invariant concept of
"generalised geodesic completeness" or "time completeness". It is based on the
notion of physical time defined by counting oscillations for some physically
allowed proces... | [
{
"created": "Thu, 20 Oct 2022 12:23:23 GMT",
"version": "v1"
}
] | 2022-10-21 | [
[
"Rubakov",
"V. A.",
""
],
[
"Wetterich",
"C.",
""
]
] | The geometric concept of geodesic completeness depends on the choice of the metric field or "metric frame". We develop a frame-invariant concept of "generalised geodesic completeness" or "time completeness". It is based on the notion of physical time defined by counting oscillations for some physically allowed process.... |
gr-qc/0405101 | Frans Pretorius | M.W. Choptuik, E.W. Hirschmann, S.L. Liebling, F. Pretorius | Critical Collapse of a Complex Scalar Field with Angular Momentum | 4 pages, 4 figures | Phys.Rev.Lett. 93 (2004) 131101 | 10.1103/PhysRevLett.93.131101 | null | gr-qc | null | We report a new critical solution found at the threshold of axisymmetric
gravitational collapse of a complex scalar field with angular momentum. To
carry angular momentum the scalar field cannot be axisymmetric; however, its
azimuthal dependence is defined so that the resulting stress energy tensor and
spacetime metr... | [
{
"created": "Tue, 18 May 2004 21:26:12 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Choptuik",
"M. W.",
""
],
[
"Hirschmann",
"E. W.",
""
],
[
"Liebling",
"S. L.",
""
],
[
"Pretorius",
"F.",
""
]
] | We report a new critical solution found at the threshold of axisymmetric gravitational collapse of a complex scalar field with angular momentum. To carry angular momentum the scalar field cannot be axisymmetric; however, its azimuthal dependence is defined so that the resulting stress energy tensor and spacetime metric... |
gr-qc/9901055 | Claus Kiefer | A. Barvinsky, A. Kamenshchik, C. Kiefer | Effective action and decoherence by fermions in quantum cosmology | Latex, 26 pages | Nucl.Phys. B552 (1999) 420-444 | 10.1016/S0550-3213(99)00253-9 | Freiburg THEP-98/27 | gr-qc hep-th | null | We develop the formalism for the one-loop no-boundary state in a cosmological
model with fermions. We use it to calculate the reduced density matrix for an
inflaton field by tracing out the fermionic degrees of freedom, yielding both
the fermionic effective action and the standard decoherence factor. We show
that dim... | [
{
"created": "Wed, 20 Jan 1999 10:39:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Barvinsky",
"A.",
""
],
[
"Kamenshchik",
"A.",
""
],
[
"Kiefer",
"C.",
""
]
] | We develop the formalism for the one-loop no-boundary state in a cosmological model with fermions. We use it to calculate the reduced density matrix for an inflaton field by tracing out the fermionic degrees of freedom, yielding both the fermionic effective action and the standard decoherence factor. We show that dimen... |
1509.02263 | Amalaya Khurshudyan | M. Khurshudyan and R. Myrzakulov | Phase space analysis of some interacting Chaplygin gas models | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of this paper is to discuss phase space analysis of some interacting
Chaplygin gas models in General Relativity. Chaplygin gas is one of the fluids
actively considered in modern cosmology due to the fact that it is a joint
model of dark energy and dark matter. In this paper we have considered various
forms o... | [
{
"created": "Tue, 8 Sep 2015 07:08:10 GMT",
"version": "v1"
}
] | 2015-09-09 | [
[
"Khurshudyan",
"M.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | The goal of this paper is to discuss phase space analysis of some interacting Chaplygin gas models in General Relativity. Chaplygin gas is one of the fluids actively considered in modern cosmology due to the fact that it is a joint model of dark energy and dark matter. In this paper we have considered various forms of ... |
1009.2468 | Bruno Giacomazzo | Bruno Giacomazzo, Luciano Rezzolla, Luca Baiotti | Accurate evolutions of inspiralling and magnetized neutron-stars:
equal-mass binaries | 18 pages, 10 figures. Added two new figures (figures 1 and 7). Small
modifications to the text to match the version published on Phys. Rev. D | Phys.Rev.D83:044014,2011 | 10.1103/PhysRevD.83.044014 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By performing new, long and numerically accurate general-relativistic
simulations of magnetized, equal-mass neutron-star binaries, we investigate the
role that realistic magnetic fields may have in the evolution of these systems.
In particular, we study the evolution of the magnetic fields and show that they
can infl... | [
{
"created": "Mon, 13 Sep 2010 18:22:55 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 2011 21:35:28 GMT",
"version": "v2"
}
] | 2011-02-18 | [
[
"Giacomazzo",
"Bruno",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Baiotti",
"Luca",
""
]
] | By performing new, long and numerically accurate general-relativistic simulations of magnetized, equal-mass neutron-star binaries, we investigate the role that realistic magnetic fields may have in the evolution of these systems. In particular, we study the evolution of the magnetic fields and show that they can influe... |
0907.0640 | Dah-Wei Chiou | Dah-Wei Chiou and Li-Fang Li | Loop quantum cosmology with higher order holonomy corrections | 32 pages, 2 figures; typos corrected; version to appear in PRD | Phys. Rev. D 80, 043512 (2009) | 10.1103/PhysRevD.80.043512 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With a well-motivated extension of higher order holonomy corrections, the
quantum theory of loop quantum cosmology (LQC) for the $k=0$
Friedmann-Robertson-Walker model (with a free massless scalar) is rigorously
formulated. The analytical investigation reveals that, regardless of the order
of holonomy corrections and... | [
{
"created": "Fri, 3 Jul 2009 14:06:23 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2009 13:00:07 GMT",
"version": "v2"
}
] | 2009-08-18 | [
[
"Chiou",
"Dah-Wei",
""
],
[
"Li",
"Li-Fang",
""
]
] | With a well-motivated extension of higher order holonomy corrections, the quantum theory of loop quantum cosmology (LQC) for the $k=0$ Friedmann-Robertson-Walker model (with a free massless scalar) is rigorously formulated. The analytical investigation reveals that, regardless of the order of holonomy corrections and f... |
gr-qc/0409042 | Ken-Ichi Nakao | Ken-ichi Nakao and Yoshiyuki Morisawa | High-Speed Cylindrical Collapse of Perfect Fluid | 15pages, 1figure, PTPTex | Prog.Theor.Phys. 113 (2005) 73-85 | 10.1143/PTP.113.73 | OCU-PHYS-217, AP-GR-17, YITP-04-48 | gr-qc | null | The gravitational collapse of cylindrically distributed perfect fluid is
studied. We assume the collapsing speed of fluid is very large and investigate
such a situation by recently proposed high-speed approximation scheme. We show
that if the value of the pressure divided by the energy density is bounded
below by som... | [
{
"created": "Fri, 10 Sep 2004 06:01:23 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2005 08:01:44 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Nakao",
"Ken-ichi",
""
],
[
"Morisawa",
"Yoshiyuki",
""
]
] | The gravitational collapse of cylindrically distributed perfect fluid is studied. We assume the collapsing speed of fluid is very large and investigate such a situation by recently proposed high-speed approximation scheme. We show that if the value of the pressure divided by the energy density is bounded below by some ... |
1004.5077 | Alexey Krugly | Alexey L. Krugly | Discrete mechanics: a sequential growth dynamics for causal sets, and a
self-organization of particles | 46 pages, 23 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model of a discrete pregeometry on a microscopic scale is introduced. This
model is a finite network of finite elementary processes. The mathematical
description is a d-graph that is a generalization of a graph. This is the
particular case of a causal set. The aim of this study is to construct the
particles as emer... | [
{
"created": "Wed, 28 Apr 2010 16:40:07 GMT",
"version": "v1"
}
] | 2010-04-29 | [
[
"Krugly",
"Alexey L.",
""
]
] | A model of a discrete pregeometry on a microscopic scale is introduced. This model is a finite network of finite elementary processes. The mathematical description is a d-graph that is a generalization of a graph. This is the particular case of a causal set. The aim of this study is to construct the particles as emerge... |
1404.6444 | Subhajit Saha | Subenoy Chakraborty and Subhajit Saha | A complete cosmic scenario from inflation to late time acceleration:
Non-equilibrium thermodynamics in the context of particle creation | 27 pages, 5 figures | Physical Review D 90, 123505 (2014) | 10.1103/PhysRevD.90.123505 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with the mechanism of particle creation in the framework of
irreversible thermodynamics. The second order non-equilibrium thermodynamical
prescription of Israel and Stewart has been presented with particle creation
rate, treated as the dissipative effect. In the background of a flat FRW model,
we assu... | [
{
"created": "Thu, 24 Apr 2014 13:54:37 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2015 06:37:43 GMT",
"version": "v2"
}
] | 2016-05-04 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Saha",
"Subhajit",
""
]
] | The paper deals with the mechanism of particle creation in the framework of irreversible thermodynamics. The second order non-equilibrium thermodynamical prescription of Israel and Stewart has been presented with particle creation rate, treated as the dissipative effect. In the background of a flat FRW model, we assume... |
gr-qc/9501038 | Robert Bruce Mann | R.B. Mann | Lower Dimensional Black Holes: Inside and Out | 27 pages. Latex, invited talk given at Winnipeg conference on Heat
Kernels and Quantum Gravity | null | null | WATPHYS TH-95/02 | gr-qc | null | I survey the physics of black holes in two and three spacetime dimensions,
with special attention given to an understanding of their exterior and interior
properties.
| [
{
"created": "Fri, 27 Jan 1995 10:00:34 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Mann",
"R. B.",
""
]
] | I survey the physics of black holes in two and three spacetime dimensions, with special attention given to an understanding of their exterior and interior properties. |
1603.02866 | Kamal Hajian | Sajad Aghapour and Kamal Hajian | Black Hole Entropy from Entropy of Hawking Radiation | 7 pages, published version | Journal of Modern Physics, Volume 7, (2016), pp 2063-2070 | 10.4236/jmp.2016.715181 | IPM/P-2016/009 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a simple way for calculating the entropy of a Schwarzschild black
hole from the entropy of its Hawking radiation. To this end, we show that if a
thermodynamic system loses its energy only through the black body radiation,
its loss of entropy is always 3/4 of the entropy of the emitted radiation. This
propo... | [
{
"created": "Wed, 9 Mar 2016 12:35:00 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Mar 2016 13:02:24 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Nov 2016 05:06:37 GMT",
"version": "v3"
}
] | 2017-03-13 | [
[
"Aghapour",
"Sajad",
""
],
[
"Hajian",
"Kamal",
""
]
] | We provide a simple way for calculating the entropy of a Schwarzschild black hole from the entropy of its Hawking radiation. To this end, we show that if a thermodynamic system loses its energy only through the black body radiation, its loss of entropy is always 3/4 of the entropy of the emitted radiation. This proposi... |
1212.1342 | Janilo Santos | Janilo Santos and Crislane de Souza Santos | Palatini approach to modified f(R) gravity and its bi-metric structure | 3 pages, 1 table, talk given at I CosmoSul: Cosmology and Gravitation
in the Southern Cone | AIP Conf. Proc. 1471, 111 (2012) | 10.1063/1.4756822 | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | f(R) gravity theories in the Palatini formalism has been recently used as an
alternative way to explain the observed late-time cosmic acceleration with no
need of invoking either dark energy or extra spatial dimension. However, its
applications have shown that some subtleties of these theories need a more
profound ex... | [
{
"created": "Thu, 6 Dec 2012 15:03:34 GMT",
"version": "v1"
}
] | 2012-12-07 | [
[
"Santos",
"Janilo",
""
],
[
"Santos",
"Crislane de Souza",
""
]
] | f(R) gravity theories in the Palatini formalism has been recently used as an alternative way to explain the observed late-time cosmic acceleration with no need of invoking either dark energy or extra spatial dimension. However, its applications have shown that some subtleties of these theories need a more profound exam... |
1204.3039 | Stefano Finazzi | Stefano Finazzi, Stefano Liberati, and Lorenzo Sindoni | The analogue cosmological constant in Bose-Einstein condensates: a
lesson for quantum gravity | 24 pages, 1 figure, Proceedings of the II Amazonian Symposium on
Physics | null | null | AEI-2012-065 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For almost a century, the cosmological constant has been a mysterious object,
in relation to both its origin and its very small value. By using a
Bose-Einstein condensate analogue model for gravitational dynamics, we address
here the cosmological constant issue from an analogue gravity standpoint.
Starting from the f... | [
{
"created": "Fri, 13 Apr 2012 16:21:26 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2012 09:13:49 GMT",
"version": "v2"
}
] | 2012-07-25 | [
[
"Finazzi",
"Stefano",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Sindoni",
"Lorenzo",
""
]
] | For almost a century, the cosmological constant has been a mysterious object, in relation to both its origin and its very small value. By using a Bose-Einstein condensate analogue model for gravitational dynamics, we address here the cosmological constant issue from an analogue gravity standpoint. Starting from the fun... |
gr-qc/0202037 | Michele Vallisneri | Michele Vallisneri | What can we learn about neutron stars from gravity-wave observations? | Revtex 4, 3 EPS figures. To appear in the proceedings of the 25th J.
Hopkins Workshop on Current Problems in Particle Theory; 2001: A Relativistic
Spacetime Odyssey, Florence, Sep. 3--5, 2001 | null | 10.1142/9789812791368_0020 | null | gr-qc astro-ph | null | In the next few years, the first detections of gravity-wave signals using
Earth-based interferometric detectors will begin to provide precious new
information about the structure and dynamics of compact bodies such as neutron
stars. The intrinsic weakness of gravity-wave signals requires a proactive
approach to model... | [
{
"created": "Mon, 11 Feb 2002 23:41:24 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Vallisneri",
"Michele",
""
]
] | In the next few years, the first detections of gravity-wave signals using Earth-based interferometric detectors will begin to provide precious new information about the structure and dynamics of compact bodies such as neutron stars. The intrinsic weakness of gravity-wave signals requires a proactive approach to modelin... |
gr-qc/9912020 | Jerzy Matyjasek | Jerzy Matyjasek | Stress-energy tensor of neutral massive fields in the Reissner-Nordstrom
spacetime | Minor corrections to equations and text. Accepted for publication in
Phys. Rev. D | Phys.Rev. D61 (2000) 124019 | 10.1103/PhysRevD.61.124019 | UMCS-TG-99-11 | gr-qc | null | The approximation of the renormalized stress-energy tensor of the quantized
massive scalar, spinor, and vector field in the Reissner- Nordstrom spacetime
is constructed. It is achieved by functional differentiation of the lowest
order of the Schwinger-DeWitt effective action involving coincidence limit of
the Hadamar... | [
{
"created": "Mon, 6 Dec 1999 18:35:53 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 2000 14:15:52 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Matyjasek",
"Jerzy",
""
]
] | The approximation of the renormalized stress-energy tensor of the quantized massive scalar, spinor, and vector field in the Reissner- Nordstrom spacetime is constructed. It is achieved by functional differentiation of the lowest order of the Schwinger-DeWitt effective action involving coincidence limit of the Hadamard-... |
1701.02863 | Tevian Dray | Tevian Dray | Piecewise Conserved Quantities | To appear in Gravity and the Quantum, Springer 2017
(http://www.springer.com/in/book/9783319516998) | null | 10.1007/978-3-319-51700-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the treatment of conservation laws in spacetimes that are glued
together in various ways, thus adding a boundary term to the usual conservation
laws. Several examples of such spacetimes will be described, including the
joining of Schwarzschild spacetimes of different masses, and the possibility of
joining r... | [
{
"created": "Wed, 11 Jan 2017 06:33:14 GMT",
"version": "v1"
}
] | 2017-01-12 | [
[
"Dray",
"Tevian",
""
]
] | We review the treatment of conservation laws in spacetimes that are glued together in various ways, thus adding a boundary term to the usual conservation laws. Several examples of such spacetimes will be described, including the joining of Schwarzschild spacetimes of different masses, and the possibility of joining reg... |
2010.13225 | Robinson Mancilla | Jorge Alfaro, Robinson Mancilla | Thermodynamics of Graviton Condensate | 17 pages, 2 figures; Section III reconstructed, Added 2 Appendices,
Added 2 references, typos corrected | The European Physical Journal C volume 81, Article number: 871
(2021) | 10.1140/epjc/s10052-021-09638-z | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we present the thermodynamic study of a model that considers
the black hole as a condensate of gravitons. In this model, the spacetime is
not asymptotically flat because of a topological defect that introduces an
angle deficit in the spacetime like in Global Monopole solutions. We have
obtained a correc... | [
{
"created": "Sun, 25 Oct 2020 21:21:49 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Aug 2021 19:55:13 GMT",
"version": "v2"
}
] | 2021-10-08 | [
[
"Alfaro",
"Jorge",
""
],
[
"Mancilla",
"Robinson",
""
]
] | In this work, we present the thermodynamic study of a model that considers the black hole as a condensate of gravitons. In this model, the spacetime is not asymptotically flat because of a topological defect that introduces an angle deficit in the spacetime like in Global Monopole solutions. We have obtained a correcti... |
2205.11620 | Mike D. Schneider | Mike D. Schneider | A (strictly) contemporary perspective on trans-Planckian censorship | Accepted at Foundations of Physics | null | 10.1007/s10701-022-00593-7 | null | gr-qc physics.hist-ph | http://creativecommons.org/licenses/by/4.0/ | I critically discuss a controversial 'trans-Planckian censorship' conjecture,
which has recently been introduced to researchers working at the intersection
of fundamental physics and cosmology. My focus explicitly avoids any appeals to
contingent research within string theory (the sociological origins of the
conjectu... | [
{
"created": "Mon, 23 May 2022 20:39:35 GMT",
"version": "v1"
}
] | 2022-08-10 | [
[
"Schneider",
"Mike D.",
""
]
] | I critically discuss a controversial 'trans-Planckian censorship' conjecture, which has recently been introduced to researchers working at the intersection of fundamental physics and cosmology. My focus explicitly avoids any appeals to contingent research within string theory (the sociological origins of the conjecture... |
2404.18230 | Thomas Thiemann | Thomas Thiemann | Symmetry reduction, gauge reduction, backreaction and consistent higher
order perturbation theory | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For interacting classical field theories such as general relativity exact
solutions typically can only be found by imposing physically motivated
(Killing) {\it symmetry} assumptions. Such highly symmetric solutions are then
often used as {\it backgrounds} in a {\it perturbative} approach to more
general non-symmetric... | [
{
"created": "Sun, 28 Apr 2024 15:51:10 GMT",
"version": "v1"
}
] | 2024-04-30 | [
[
"Thiemann",
"Thomas",
""
]
] | For interacting classical field theories such as general relativity exact solutions typically can only be found by imposing physically motivated (Killing) {\it symmetry} assumptions. Such highly symmetric solutions are then often used as {\it backgrounds} in a {\it perturbative} approach to more general non-symmetric s... |
gr-qc/0402125 | Norbert Van den Bergh | Norbert Van den Bergh and Lode Wylleman | Silent universes with a cosmological constant | 11 pages; several typos corrected which were still present in CGQ
version; minor changes | Class.Quant.Grav.21:2291-2299,2004 | 10.1088/0264-9381/21/9/006 | null | gr-qc | null | We study non-degenerate (Petrov type I) silent universes in the presence of a
non-vanishing cosmological constant L. In contrast to the L=0 case, for which
the orthogonally spatially homogeneous Bianchi type I metrics most likely are
the only admissible metrics, solutions are shown to exist when L is positive.
The ge... | [
{
"created": "Fri, 27 Feb 2004 12:56:18 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Aug 2004 10:59:32 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Aug 2004 10:26:00 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Bergh",
"Norbert Van den",
""
],
[
"Wylleman",
"Lode",
""
]
] | We study non-degenerate (Petrov type I) silent universes in the presence of a non-vanishing cosmological constant L. In contrast to the L=0 case, for which the orthogonally spatially homogeneous Bianchi type I metrics most likely are the only admissible metrics, solutions are shown to exist when L is positive. The gene... |
2111.14749 | Wei Hong | Wei Hong, Jun Tao, Tong-Jie Zhang | Method of distinguishing between black holes and wormholes | 21 pages, 20 figures. Corresponds to version published in PRD
(original version is arXiv:2111.14749v1) | Phys.Rev.D. (2021) 104, 124063 | 10.1103/PhysRevD.104.124063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Beginning with a brief review of the regular space-time with asymptotically
Minkowski core, we can consider two copies of the space-time connected through
a short-throat wormhole whose radius of mouth is equal to or larger than an
extremal regular black hole with asymptotically Minkowski core's event horizon
radius. ... | [
{
"created": "Thu, 25 Nov 2021 05:00:53 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2022 10:49:29 GMT",
"version": "v2"
}
] | 2022-01-14 | [
[
"Hong",
"Wei",
""
],
[
"Tao",
"Jun",
""
],
[
"Zhang",
"Tong-Jie",
""
]
] | Beginning with a brief review of the regular space-time with asymptotically Minkowski core, we can consider two copies of the space-time connected through a short-throat wormhole whose radius of mouth is equal to or larger than an extremal regular black hole with asymptotically Minkowski core's event horizon radius. If... |
1003.1890 | Mubasher Jamil | K. Karami, Mubasher Jamil, N. Sahraei | Irreversible thermodynamics of dark energy on entropy-corrected apparent
horizon | 9 pages, to be published in Physica Scripta | Phys. Scr. 82 (2010) 045901 | 10.1088/0031-8949/82/04/045901 | arXiv:1003.1890v2 [gr-qc] | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the irreversible (non-equilibrium) thermodynamics of FRW universe
containing only dark energy. Using the modified entropy-area relation which is
motivated from the loop quantum gravity, we calculate the entropy-corrected
form of the apparent horizon of FRW universe.
| [
{
"created": "Tue, 9 Mar 2010 14:55:20 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Aug 2010 16:25:54 GMT",
"version": "v2"
}
] | 2010-09-14 | [
[
"Karami",
"K.",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Sahraei",
"N.",
""
]
] | We study the irreversible (non-equilibrium) thermodynamics of FRW universe containing only dark energy. Using the modified entropy-area relation which is motivated from the loop quantum gravity, we calculate the entropy-corrected form of the apparent horizon of FRW universe. |
2308.11770 | Abhik Kumar Sanyal Dr. | Dalia Saha, Jyoti Prasad Saha and Abhik Kumar Sanyal | Inflation and cosmological evolution with $F(R,G)$ gravity theory | 34 pages, 1 figure | International Journal of Geometric Methods in Modern Physics
(2023) 2350213 (48 pages), World Scientific Publishing Company | 10.1142/S0219887823502134 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the last decade Planck PR4 data together with ground-based experimental
data such as, BK18, BAO and CMB lensing, tightened constraint of the tensor to
scalar ratio, starting form $r < 0.14$ to $r < 0.032$, while the spectral index
lies within the range $0.9631 < n_s < 0.9705$. Viability of modified gravity
theorie... | [
{
"created": "Fri, 18 Aug 2023 14:43:32 GMT",
"version": "v1"
}
] | 2023-08-24 | [
[
"Saha",
"Dalia",
""
],
[
"Saha",
"Jyoti Prasad",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | In the last decade Planck PR4 data together with ground-based experimental data such as, BK18, BAO and CMB lensing, tightened constraint of the tensor to scalar ratio, starting form $r < 0.14$ to $r < 0.032$, while the spectral index lies within the range $0.9631 < n_s < 0.9705$. Viability of modified gravity theories,... |
gr-qc/0602039 | George Lavrelashvili | George Lavrelashvili | The number of negative modes of the oscillating bounces | LaTex, 6 pages, including 3 figures | Phys.Rev. D73 (2006) 083513 | 10.1103/PhysRevD.73.083513 | null | gr-qc astro-ph hep-th | null | The spectrum of small perturbations about oscillating bounce solutions
recently discussed in the literature is investigated. Our study supports quite
intuitive and expected result: the bounce with N nodes has exactly N
homogeneous negative modes. Existence of more than one negative modes makes
obscure the relation of... | [
{
"created": "Fri, 10 Feb 2006 12:09:43 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Lavrelashvili",
"George",
""
]
] | The spectrum of small perturbations about oscillating bounce solutions recently discussed in the literature is investigated. Our study supports quite intuitive and expected result: the bounce with N nodes has exactly N homogeneous negative modes. Existence of more than one negative modes makes obscure the relation of t... |
gr-qc/0506048 | Ujjal Debnath | Subenoy Chakraborty, Sanjukta Chakraborty and Ujjal Debnath | Role of Pressure in Quasi-Spherical Gravitational Collapse | 16 Latex pages, RevTex, 2 Figures | Int.J.Mod.Phys. D14 (2005) 1707-1724 | 10.1142/S0218271805007310 | null | gr-qc | null | We study quasi-spherical Szekeres space-time (which possess no killing
vectors) for perfect fluid, matter with tangential stress only and matter with
anisotropic pressure respectively. In the first two cases cosmological
solutions have been obtained and their asymptotic behaviour have been examined
while for anisotro... | [
{
"created": "Wed, 8 Jun 2005 06:20:17 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Chakraborty",
"Sanjukta",
""
],
[
"Debnath",
"Ujjal",
""
]
] | We study quasi-spherical Szekeres space-time (which possess no killing vectors) for perfect fluid, matter with tangential stress only and matter with anisotropic pressure respectively. In the first two cases cosmological solutions have been obtained and their asymptotic behaviour have been examined while for anisotropi... |
1212.5297 | David Aasen | David Aasen, Tejal Bhamre, Achim Kempf | Shape from sound: toward new tools for quantum gravity | 5 pages, 1 figure | Phys. Rev. Lett. 110, 121301 (2013) | 10.1103/PhysRevLett.110.121301 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To unify general relativity and quantum theory is hard in part because they
are formulated in two very different mathematical languages, differential
geometry and functional analysis. A natural candidate for bridging this
language gap, at least in the case of the euclidean signature, is the
discipline of spectral geo... | [
{
"created": "Thu, 20 Dec 2012 23:20:27 GMT",
"version": "v1"
}
] | 2013-03-19 | [
[
"Aasen",
"David",
""
],
[
"Bhamre",
"Tejal",
""
],
[
"Kempf",
"Achim",
""
]
] | To unify general relativity and quantum theory is hard in part because they are formulated in two very different mathematical languages, differential geometry and functional analysis. A natural candidate for bridging this language gap, at least in the case of the euclidean signature, is the discipline of spectral geome... |
2306.11142 | Neev Khera | Neev Khera, Ariadna Ribes Metidieri, B\'eatrice Bonga, Xisco Jim\'enez
Forteza, Badri Krishnan, Eric Poisson, Daniel Pook-Kolb, Erik Schnetter, Huan
Yang | Nonlinear ringdown at the black hole horizon | Version appeared in PRL. 14 pages, 15 figures | Phys. Rev. Lett. 131, no.23, 231401 (2023) | 10.1103/PhysRevLett.131.231401 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational waves emitted by a perturbed black hole ringing down are
well described by damped sinusoids, whose frequencies are those of quasinormal
modes. Typically, first-order black hole perturbation theory is used to
calculate these frequencies. Recently, it was shown that second-order effects
are necessary ... | [
{
"created": "Mon, 19 Jun 2023 19:56:33 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2023 11:52:59 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Jan 2024 18:16:28 GMT",
"version": "v3"
}
] | 2024-01-22 | [
[
"Khera",
"Neev",
""
],
[
"Metidieri",
"Ariadna Ribes",
""
],
[
"Bonga",
"Béatrice",
""
],
[
"Forteza",
"Xisco Jiménez",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Poisson",
"Eric",
""
],
[
"Pook-Kolb",
"Daniel",
... | The gravitational waves emitted by a perturbed black hole ringing down are well described by damped sinusoids, whose frequencies are those of quasinormal modes. Typically, first-order black hole perturbation theory is used to calculate these frequencies. Recently, it was shown that second-order effects are necessary in... |
1109.0501 | Chris Messenger | Chris Messenger | A semi-coherent search strategy for known continuous wave sources in
binary systems | 18 pages, 4 figures | null | 10.1103/PhysRevD.84.083003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a method for detection of weak continuous signals from sources in
binary systems via the incoherent combination of many "short"
coherently-analyzed segments. The main focus of the work is on the construction
of a metric on the parameter space for such signals for use in matched-filter
based searches. The m... | [
{
"created": "Fri, 2 Sep 2011 16:56:30 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Messenger",
"Chris",
""
]
] | We present a method for detection of weak continuous signals from sources in binary systems via the incoherent combination of many "short" coherently-analyzed segments. The main focus of the work is on the construction of a metric on the parameter space for such signals for use in matched-filter based searches. The met... |
2011.14710 | Mikhail Iofa | Mikhail Z. Iofa | Surface charge of horizon symmetries of a black hole with
supertranslation field | 22 pages, extended and corrected version | Phys. Rev. D 104, 044050 (2021) | 10.1103/PhysRevD.104.044050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Near-horizon symmetries are studied for static black hole solutions to
Einstein equations containing supertranslation field. We consider general
diffeomorphisms which preserve the gauge and the near-horizon structure of the
metric. Diffeomorphisms are generated by the vector fields and form a group of
near-horizon sy... | [
{
"created": "Mon, 30 Nov 2020 11:43:17 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Mar 2021 13:57:54 GMT",
"version": "v2"
}
] | 2021-08-25 | [
[
"Iofa",
"Mikhail Z.",
""
]
] | Near-horizon symmetries are studied for static black hole solutions to Einstein equations containing supertranslation field. We consider general diffeomorphisms which preserve the gauge and the near-horizon structure of the metric. Diffeomorphisms are generated by the vector fields and form a group of near-horizon symm... |
2302.13047 | Claus Kiefer | Claus Kiefer | Quantum gravity -- an unfinished revolution | 24 pages, 6 figures, invited contribution to EPS Grand Challenges:
Physics for Society at the Horizon 2050 | null | null | null | gr-qc hep-th physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is generally assumed that the search for a consistent and testable theory
of quantum gravity is among the most important open problems of fundamental
physics. I review the motivations for this search, the main problems on the
way, and the status of present approaches and their physical relevance. I
speculate on wh... | [
{
"created": "Sat, 25 Feb 2023 10:12:22 GMT",
"version": "v1"
}
] | 2023-02-28 | [
[
"Kiefer",
"Claus",
""
]
] | It is generally assumed that the search for a consistent and testable theory of quantum gravity is among the most important open problems of fundamental physics. I review the motivations for this search, the main problems on the way, and the status of present approaches and their physical relevance. I speculate on what... |
gr-qc/0703061 | Yosef Zlochower | Carlos O. Lousto, Yosef Zlochower | A practical formula for the radiated angular momentum | 4 pages, revtex4, Accepted to PRD | Phys.Rev.D76:041502,2007 | 10.1103/PhysRevD.76.041502 | null | gr-qc astro-ph | null | We present a simple formula for the radiated angular momentum based on a
spin-weighted spherical harmonic decomposition of the Weyl scalar psi_4
representing outgoing radiation in the Kinnersley tetrad. We test our formula
by measuring the radiated angular momentum from three simulations of
non-spinning equal-mass bl... | [
{
"created": "Fri, 9 Mar 2007 19:21:34 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Jun 2007 16:05:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lousto",
"Carlos O.",
""
],
[
"Zlochower",
"Yosef",
""
]
] | We present a simple formula for the radiated angular momentum based on a spin-weighted spherical harmonic decomposition of the Weyl scalar psi_4 representing outgoing radiation in the Kinnersley tetrad. We test our formula by measuring the radiated angular momentum from three simulations of non-spinning equal-mass blac... |
1801.02204 | Miguel Gustavo De Campos Batista | B. Terezon and M. Campos | Final fate of Kantowski-Sachs gravitational collapse | We made a few changes and were a little more careful with the wording | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although it is not a fundamental question, to determine exact and general
solutions for a given theory has advantages over a numerical integration in
many specific cases. Of course, respecting the peculiarities of the problem.
Revisiting the integration of the General Relativity Theory field equations for
the Kantows... | [
{
"created": "Sun, 7 Jan 2018 16:06:22 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2018 20:30:17 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Nov 2018 20:17:28 GMT",
"version": "v3"
},
{
"created": "Sat, 9 Nov 2019 20:39:04 GMT",
"version": "v4"
}
] | 2019-11-12 | [
[
"Terezon",
"B.",
""
],
[
"Campos",
"M.",
""
]
] | Although it is not a fundamental question, to determine exact and general solutions for a given theory has advantages over a numerical integration in many specific cases. Of course, respecting the peculiarities of the problem. Revisiting the integration of the General Relativity Theory field equations for the Kantowski... |
1209.2895 | Francisco Lobo | Salvatore Capozziello, Tiberiu Harko, Tomi S. Koivisto, Francisco S.N.
Lobo, Gonzalo J. Olmo | Cosmology of hybrid metric-Palatini f(X)-gravity | 17 pages. V2: 18 pages; minor revision and references added; to
appear in JCAP | JCAP 04 (2013) 011 | 10.1088/1475-7516/2013/04/011 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new class of modified theories of gravity, consisting of the superposition
of the metric Einstein-Hilbert Lagrangian with an $f(\cal R)$ term constructed
\`{a} la Palatini was proposed recently. The dynamically equivalent
scalar-tensor representation of the model was also formulated, and it was shown
that even if t... | [
{
"created": "Thu, 13 Sep 2012 14:02:23 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Mar 2013 15:51:10 GMT",
"version": "v2"
}
] | 2013-04-05 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Koivisto",
"Tomi S.",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Olmo",
"Gonzalo J.",
""
]
] | A new class of modified theories of gravity, consisting of the superposition of the metric Einstein-Hilbert Lagrangian with an $f(\cal R)$ term constructed \`{a} la Palatini was proposed recently. The dynamically equivalent scalar-tensor representation of the model was also formulated, and it was shown that even if the... |
2112.10109 | Rajes Ghosh | Kabir Chakravarti, Rajes Ghosh, and Sudipta Sarkar | Signature of Non-uniform Area Quantization on Black Hole Echoes | 8 pages, 6 figures | null | 10.1103/PhysRevD.105.044046 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A classical black hole is characterized by a horizon that absorbs radiation
of all frequencies incident on it. Perturbation of these black holes is
well-understood via exponentially damped sinusoids known as quasi-normal modes.
Any departure from such classical behavior near the horizon may induce
significant modific... | [
{
"created": "Sun, 19 Dec 2021 10:30:36 GMT",
"version": "v1"
}
] | 2022-03-09 | [
[
"Chakravarti",
"Kabir",
""
],
[
"Ghosh",
"Rajes",
""
],
[
"Sarkar",
"Sudipta",
""
]
] | A classical black hole is characterized by a horizon that absorbs radiation of all frequencies incident on it. Perturbation of these black holes is well-understood via exponentially damped sinusoids known as quasi-normal modes. Any departure from such classical behavior near the horizon may induce significant modificat... |
2108.02124 | G\'abor Zsolt T\'oth | Gabor Zsolt Toth | Energy-momentum tensor and duality symmetry of linearized gravity in the
Fierz formalism | 45 pages, revised manuscript, title change | Classical and Quantum Gravity 39 (2022) 075003 | 10.1088/1361-6382/ac50eb | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A formulation of linearized gravity in flat background, based on the Fierz
tensor as a counterpart of the electromagnetic field strength, is discussed in
detail and used to study fundamental properties of the linearized gravitational
field. In particular, the linearized Einstein equations are written as first
order p... | [
{
"created": "Wed, 4 Aug 2021 15:51:20 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Sep 2021 14:42:44 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Mar 2022 18:40:58 GMT",
"version": "v3"
}
] | 2022-03-30 | [
[
"Toth",
"Gabor Zsolt",
""
]
] | A formulation of linearized gravity in flat background, based on the Fierz tensor as a counterpart of the electromagnetic field strength, is discussed in detail and used to study fundamental properties of the linearized gravitational field. In particular, the linearized Einstein equations are written as first order par... |
1802.07735 | Miguel Correia | Miguel R. Correia, Vitor Cardoso | Characterization of echoes: A Dyson-series representation of individual
pulses | 12 pages, 3 figures. v2: Minor updates, including revised notation
for permutations and further elaboration on the concluding remarks. Version
to appear in Physical Review D | Phys. Rev. D 97, 084030 (2018) | 10.1103/PhysRevD.97.084030 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ability to detect and scrutinize gravitational waves from the merger and
coalescence of compact binaries opens up the possibility to perform tests of
fundamental physics. One such test concerns the dark, nature of compact
objects: are they really black holes? It was recently pointed out that the
absence of horizo... | [
{
"created": "Wed, 21 Feb 2018 19:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 2018 14:00:28 GMT",
"version": "v2"
},
{
"created": "Sun, 8 Apr 2018 11:31:39 GMT",
"version": "v3"
}
] | 2018-04-25 | [
[
"Correia",
"Miguel R.",
""
],
[
"Cardoso",
"Vitor",
""
]
] | The ability to detect and scrutinize gravitational waves from the merger and coalescence of compact binaries opens up the possibility to perform tests of fundamental physics. One such test concerns the dark, nature of compact objects: are they really black holes? It was recently pointed out that the absence of horizons... |
0910.0611 | Kourosh Nozari | Kourosh Nozari, T. Azizi and M. R. Setare | Phantom-Like Behavior of a DGP-Inspired Scalar-Gauss-Bonnet Gravity | 20 pages, revised version, typos fixed, new references, to appear in
JCAP | JCAP 0910:022,2009 | 10.1088/1475-7516/2009/10/022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phantom-like behavior of a DGP-inspired braneworld scenario
where curvature correction on the brane is taken into account. We include a
possible modification of the induced gravity on the brane by incorporating
higher order curvature terms of Gauss-Bonnet type. We investigate the
cosmological implication... | [
{
"created": "Sun, 4 Oct 2009 14:59:00 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Oct 2009 08:30:01 GMT",
"version": "v2"
}
] | 2010-04-30 | [
[
"Nozari",
"Kourosh",
""
],
[
"Azizi",
"T.",
""
],
[
"Setare",
"M. R.",
""
]
] | We study the phantom-like behavior of a DGP-inspired braneworld scenario where curvature correction on the brane is taken into account. We include a possible modification of the induced gravity on the brane by incorporating higher order curvature terms of Gauss-Bonnet type. We investigate the cosmological implications ... |
gr-qc/9706017 | David I. Santiago | D. I. Santiago, D. Kalligas, and R. V. Wagoner | Nucleosynthesis Constraints on Scalar-Tensor Theories of Gravity | 15 pages, 2 figures, ReVTeX 3.1, submitted to Phys. Rev. D15 | Phys.Rev.D56:7627-7637,1997 | 10.1103/PhysRevD.56.7627 | null | gr-qc astro-ph | null | We study the cosmological evolution of massless single-field scalar-tensor
theories of gravitation from the time before the onset of $e^+e^-$ annihilation
and nucleosynthesis up to the present. The cosmological evolution together with
the observational bounds on the abundances of the lightest elements (those
mostly p... | [
{
"created": "Thu, 5 Jun 1997 22:33:48 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Santiago",
"D. I.",
""
],
[
"Kalligas",
"D.",
""
],
[
"Wagoner",
"R. V.",
""
]
] | We study the cosmological evolution of massless single-field scalar-tensor theories of gravitation from the time before the onset of $e^+e^-$ annihilation and nucleosynthesis up to the present. The cosmological evolution together with the observational bounds on the abundances of the lightest elements (those mostly pro... |
gr-qc/9912085 | Lawrence C. Shepley | J.M. Pons, D.C. Salisbury, L. C. Shepley | Gauge group and reality conditions in Ashtekar's complex formulation of
canonical gravity | Submitted to Phys. Rev. D15. - 17 pages | Phys.Rev. D62 (2000) 064026 | 10.1103/PhysRevD.62.064026 | null | gr-qc | null | We discuss reality conditions and the relation between spacetime
diffeomorphisms and gauge transformations in Ashtekar's complex formulation of
general relativity. We produce a general theoretical framework for the
stabilization algorithm for the reality conditions, which is different from
Dirac's method of stabiliza... | [
{
"created": "Mon, 20 Dec 1999 22:03:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Pons",
"J. M.",
""
],
[
"Salisbury",
"D. C.",
""
],
[
"Shepley",
"L. C.",
""
]
] | We discuss reality conditions and the relation between spacetime diffeomorphisms and gauge transformations in Ashtekar's complex formulation of general relativity. We produce a general theoretical framework for the stabilization algorithm for the reality conditions, which is different from Dirac's method of stabilizati... |
1401.4077 | Alberto Favaro | Alberto Favaro and Friedrich W. Hehl | Fresnel versus Kummer surfaces: geometrical optics in dispersionless
linear (meta)materials and vacuum | Invited lecture at "Electromagnetic Spacetimes", Wolfgang Pauli
Institute, Vienna, 19--23 Nov 2012 | null | null | null | gr-qc physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geometrical optics describes, with good accuracy, the propagation of
high-frequency plane waves through an electromagnetic medium. Under such
approximation, the behaviour of the electromagnetic fields is characterised by
just three quantities: the temporal frequency $\omega$, the spatial wave
(co)vector $k$, and the ... | [
{
"created": "Thu, 16 Jan 2014 16:22:07 GMT",
"version": "v1"
}
] | 2014-01-17 | [
[
"Favaro",
"Alberto",
""
],
[
"Hehl",
"Friedrich W.",
""
]
] | Geometrical optics describes, with good accuracy, the propagation of high-frequency plane waves through an electromagnetic medium. Under such approximation, the behaviour of the electromagnetic fields is characterised by just three quantities: the temporal frequency $\omega$, the spatial wave (co)vector $k$, and the po... |
1905.02368 | Subenoy Chakraborty | Sourav Dutta, Muthusamy Lakshmanan, Subenoy Chakraborty | Quantum cosmology for non-minimally coupled scalar field in FLRW
space-time: A symmetry analysis | Accepted for publication in Annals of Physics | null | 10.1016/j.aop.2019.04.012 | null | gr-qc nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work deals with quantum cosmology for non-minimally coupled
scalar field in the background of FLRW space--time model. The Wheeler-DeWitt
equation is constructed and symmetry analysis is carried out. The Lie point
symmetries are related to the conformal algebra of the minisuperspace while
solution of the W... | [
{
"created": "Tue, 7 May 2019 06:18:52 GMT",
"version": "v1"
}
] | 2019-06-26 | [
[
"Dutta",
"Sourav",
""
],
[
"Lakshmanan",
"Muthusamy",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The present work deals with quantum cosmology for non-minimally coupled scalar field in the background of FLRW space--time model. The Wheeler-DeWitt equation is constructed and symmetry analysis is carried out. The Lie point symmetries are related to the conformal algebra of the minisuperspace while solution of the Whe... |
gr-qc/0404072 | Carlos Kozameh | Emanuel Gallo, Carlos Kozameh, Ezra T. Newman, and Kiplin Perkins | Cartan Normal Conformal Connections from Pairs of 2nd Order PDE's | 39 pages | Class.Quant.Grav. 21 (2004) 4063-4986 | 10.1088/0264-9381/21/17/004 | null | gr-qc | null | We explore the different geometric structures that can be constructed from
the class of pairs of 2nd order PDE's that satisfy the condition of a vanishing
generalized W\"{u}nschmann invariant. This condition arises naturally from the
requirement of a vanishing torsion tensor. In particular, we find that from
this cla... | [
{
"created": "Fri, 16 Apr 2004 14:28:19 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gallo",
"Emanuel",
""
],
[
"Kozameh",
"Carlos",
""
],
[
"Newman",
"Ezra T.",
""
],
[
"Perkins",
"Kiplin",
""
]
] | We explore the different geometric structures that can be constructed from the class of pairs of 2nd order PDE's that satisfy the condition of a vanishing generalized W\"{u}nschmann invariant. This condition arises naturally from the requirement of a vanishing torsion tensor. In particular, we find that from this class... |
gr-qc/0303052 | Roman Konoplya | R.A.Konoplya | Quasinormal behavior of the D-dimensional Schwarzshild black hole and
higher order WKB approach | 15 pages, 6 figures, the 6th order WKB formula for computing QNMs in
Mathematica is available from https://goo.gl/nykYGL | Phys.Rev.D68:024018,2003 | 10.1103/PhysRevD.68.024018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study characteristic (quasinormal) modes of a $D$-dimensional Schwarzshild
black hole. It proves out that the real parts of the complex quasinormal modes,
representing the real oscillation frequencies, are proportional to the product
of the number of dimensions and inverse horizon radius $\sim D r_{0}^{-1}$. The
a... | [
{
"created": "Wed, 12 Mar 2003 17:16:55 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Mar 2003 11:24:40 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Apr 2003 15:36:49 GMT",
"version": "v3"
},
{
"created": "Fri, 18 Apr 2003 09:30:03 GMT",
"version": "v4"
},
{
"c... | 2018-04-04 | [
[
"Konoplya",
"R. A.",
""
]
] | We study characteristic (quasinormal) modes of a $D$-dimensional Schwarzshild black hole. It proves out that the real parts of the complex quasinormal modes, representing the real oscillation frequencies, are proportional to the product of the number of dimensions and inverse horizon radius $\sim D r_{0}^{-1}$. The asy... |
gr-qc/0008013 | Yuri N. Obukhov | Yuri N. Obukhov and Romualdo Tresguerres | Hyperfluid - a model of classical matter with hypermomentum | plain Tex, 11 pages, no figures | Phys.Lett. A184 (1993) 17-22 | 10.1016/0375-9601(93)90339-2 | null | gr-qc | null | A variational theory of a continuous medium is developed the elements of
which carry momentum and hypermomentum (hyperfluid). It is shown that the
structure of the sources in metric-affine gravity is predetermined by the
conservation identities and, when using the Weyssenhoff ansatz, these
explicitly yield the hyperf... | [
{
"created": "Mon, 7 Aug 2000 14:14:43 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Obukhov",
"Yuri N.",
""
],
[
"Tresguerres",
"Romualdo",
""
]
] | A variational theory of a continuous medium is developed the elements of which carry momentum and hypermomentum (hyperfluid). It is shown that the structure of the sources in metric-affine gravity is predetermined by the conservation identities and, when using the Weyssenhoff ansatz, these explicitly yield the hyperflu... |
1808.05970 | Oscar Castillo Felisola Dr. | Oscar Castillo-Felisola and Jos\'e Perdiguero and Oscar Orellana | Cosmological solutions to polynomial affine gravity in the torsion-free
sector | V2: 14 pages, bibliography corrected. Accepted as a chapter for the
book "Redefining Standard Model Cosmology" to be published by IntechOpen | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by-sa/4.0/ | We find possible cosmological models of the Polynomial Affine Gravity
described by connections that are either compatible or not with a metric. When
possible, we compare them with those of General Relativity. We show that the
set of cosmological vacuum solutions in General Relativity are a subset of the
solutions of ... | [
{
"created": "Fri, 17 Aug 2018 19:02:43 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2019 19:13:33 GMT",
"version": "v2"
}
] | 2019-04-11 | [
[
"Castillo-Felisola",
"Oscar",
""
],
[
"Perdiguero",
"José",
""
],
[
"Orellana",
"Oscar",
""
]
] | We find possible cosmological models of the Polynomial Affine Gravity described by connections that are either compatible or not with a metric. When possible, we compare them with those of General Relativity. We show that the set of cosmological vacuum solutions in General Relativity are a subset of the solutions of Po... |
2208.05544 | Vasilis Oikonomou | V.K. Oikonomou | Kinetic Axion $F(R)$ Gravity Inflation | PRD Accepted | null | 10.1103/PhysRevD.106.044041 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the quantitative effects of the misalignment
kinetic axion on $R^2$ inflation. Due to the fact that the kinetic axion
possesses a large kinetic energy which dominates its potential energy, during
inflation its energy density redshifts as stiff matter fluid and evolves in a
constant-roll wa... | [
{
"created": "Wed, 10 Aug 2022 20:08:02 GMT",
"version": "v1"
}
] | 2022-08-31 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this work we investigate the quantitative effects of the misalignment kinetic axion on $R^2$ inflation. Due to the fact that the kinetic axion possesses a large kinetic energy which dominates its potential energy, during inflation its energy density redshifts as stiff matter fluid and evolves in a constant-roll way,... |
2311.00302 | Sen Guo | Yu-Xiang Huang, Sen Guo, Yu-Hao Cui, Qing-Quan Jiang, Kai Lin | Influence of accretion disk on the optical appearance of the
Kazakov-Solodukhin black hole | null | Physical Review D (2023) | 10.1103/PhysRevD.107.123009 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The optical characteristics of the Kazakov-Solodukhin (KS) black hole (BH)
surrounded by a thin disk is investigated. By utilizing the ray-tracing
technique, we derive the the direct and secondary images to illustrate the
influence of observational inclination angle (\theta_{0}) and quantum
correction parameter (a) o... | [
{
"created": "Wed, 1 Nov 2023 05:09:42 GMT",
"version": "v1"
}
] | 2023-11-02 | [
[
"Huang",
"Yu-Xiang",
""
],
[
"Guo",
"Sen",
""
],
[
"Cui",
"Yu-Hao",
""
],
[
"Jiang",
"Qing-Quan",
""
],
[
"Lin",
"Kai",
""
]
] | The optical characteristics of the Kazakov-Solodukhin (KS) black hole (BH) surrounded by a thin disk is investigated. By utilizing the ray-tracing technique, we derive the the direct and secondary images to illustrate the influence of observational inclination angle (\theta_{0}) and quantum correction parameter (a) on ... |
1607.00596 | Alejandro Cardenas Avendano | Cosimo Bambi, Alejandro Cardenas-Avendano, Thomas Dauser, Javier A.
Garcia, Sourabh Nampalliwar | Testing the Kerr black hole hypothesis using X-ray reflection
spectroscopy | 19 pages, 12 figures. v2: refereed version | Astrophys.J. 842: 76 (2017) | 10.3847/1538-4357/aa74c0 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first X-ray reflection model for testing the assumption that
the metric of astrophysical black holes is described by the Kerr solution. We
employ the formalism of the transfer function proposed by Cunningham. The
calculations of the reflection spectrum of a thin accretion disk are split into
two parts:... | [
{
"created": "Sun, 3 Jul 2016 05:46:12 GMT",
"version": "v1"
},
{
"created": "Fri, 19 May 2017 20:13:18 GMT",
"version": "v2"
}
] | 2017-06-19 | [
[
"Bambi",
"Cosimo",
""
],
[
"Cardenas-Avendano",
"Alejandro",
""
],
[
"Dauser",
"Thomas",
""
],
[
"Garcia",
"Javier A.",
""
],
[
"Nampalliwar",
"Sourabh",
""
]
] | We present the first X-ray reflection model for testing the assumption that the metric of astrophysical black holes is described by the Kerr solution. We employ the formalism of the transfer function proposed by Cunningham. The calculations of the reflection spectrum of a thin accretion disk are split into two parts: t... |
1007.3190 | Jose M. Carmona | J.M. Carmona, J.L. Cortes, D. Mazon | Asymptotic approach to Special Relativity compatible with a relativistic
principle | 12 pages | Phys.Rev.D82:085012,2010 | 10.1103/PhysRevD.82.085012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a general framework to describe Planckian deviations from Special
Relativity (SR) compatible with a relativistic principle. They are introduced
as the leading corrections in an asymptotic approach to SR going beyond the
energy power expansion of effective field theories. We discuss the conditions
in which ... | [
{
"created": "Mon, 19 Jul 2010 15:48:52 GMT",
"version": "v1"
}
] | 2012-03-14 | [
[
"Carmona",
"J. M.",
""
],
[
"Cortes",
"J. L.",
""
],
[
"Mazon",
"D.",
""
]
] | We propose a general framework to describe Planckian deviations from Special Relativity (SR) compatible with a relativistic principle. They are introduced as the leading corrections in an asymptotic approach to SR going beyond the energy power expansion of effective field theories. We discuss the conditions in which th... |
1911.03606 | Emmanuil Saridakis | Shin'ichi Nojiri, Sergei D. Odintsov, Emmanuel N. Saridakis, R.
Myrzakulov | Correspondence of cosmology from non-extensive thermodynamics with
fluids of generalized equation of state | 7 pages, version published in Nucl.Phys.B | null | 10.1016/j.nuclphysb.2019.114850 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that there is a correspondence between cosmology from non-extensive
thermodynamics and cosmology with fluids of redefined and generalized equation
of state. We first establish the correspondence in the case of basic
non-extensive thermodynamics, and then we proceed by investigating the more
consistent case, f... | [
{
"created": "Sat, 9 Nov 2019 03:38:37 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2019 08:03:35 GMT",
"version": "v2"
}
] | 2019-12-03 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | We show that there is a correspondence between cosmology from non-extensive thermodynamics and cosmology with fluids of redefined and generalized equation of state. We first establish the correspondence in the case of basic non-extensive thermodynamics, and then we proceed by investigating the more consistent case, fro... |
1703.03967 | Katerina Chatziioannou | Katerina Chatziioannou, Antoine Klein, Nicolas Yunes, Neil Cornish | Constructing Gravitational Waves from Generic Spin-Precessing Compact
Binary Inspirals | 21 pages, final published version | Phys. Rev. D 95, 104004 (2017) | 10.1103/PhysRevD.95.104004 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The coalescence of compact objects is one of the most promising sources of
gravitational waves for ground-based interferometric detectors, such as
advanced LIGO and Virgo. Generically, com- pact objects in binaries are
expected to be spinning with spin angular momenta misaligned with the orbital
angular momentum, cau... | [
{
"created": "Sat, 11 Mar 2017 12:55:19 GMT",
"version": "v1"
},
{
"created": "Fri, 5 May 2017 17:36:16 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Nov 2017 02:51:26 GMT",
"version": "v3"
}
] | 2017-11-16 | [
[
"Chatziioannou",
"Katerina",
""
],
[
"Klein",
"Antoine",
""
],
[
"Yunes",
"Nicolas",
""
],
[
"Cornish",
"Neil",
""
]
] | The coalescence of compact objects is one of the most promising sources of gravitational waves for ground-based interferometric detectors, such as advanced LIGO and Virgo. Generically, com- pact objects in binaries are expected to be spinning with spin angular momenta misaligned with the orbital angular momentum, causi... |
1705.04131 | Adrian Ciprian Sporea | Ciprian A. Sporea, Andrzej Borowiec and Aneta Wojnar | Galaxy Rotation Curves via Conformal Factors | 6 two-collumn pages, 2 figures, 1 table; Major changes in v2; version
to match the published one in Eur. Phys. J. C | null | 10.1140/epjc/s10052-018-5792-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new formula to explain circular velocity profiles of spiral
galaxies obtained from the Starobinsky model in Palatini formalism. It is based
on the assumption that the gravity can be described by two conformally related
metrics: one of them is responsible for the measurement of distances, while the
other ... | [
{
"created": "Thu, 11 May 2017 12:27:49 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2018 19:24:14 GMT",
"version": "v2"
}
] | 2018-04-13 | [
[
"Sporea",
"Ciprian A.",
""
],
[
"Borowiec",
"Andrzej",
""
],
[
"Wojnar",
"Aneta",
""
]
] | We propose a new formula to explain circular velocity profiles of spiral galaxies obtained from the Starobinsky model in Palatini formalism. It is based on the assumption that the gravity can be described by two conformally related metrics: one of them is responsible for the measurement of distances, while the other so... |
1010.4568 | Alexandre Yale | Alexandre Yale, R. B. Mann and Tadayuki Ohta | Analysis of Two-Particle Systems in 2 + 1 Gravity Through Hamiltonian
Dynamics | 8 pages, no figures. v2: Minor corrections; Journal ref added | Class.Quant.Grav.27:245005,2010 | 10.1088/0264-9381/27/24/245005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of particles coupled to gravity in (2 + 1) dimensions.
Using the ADM formalism, we derive the general Hamiltonian for an N-body system
and analyze the dynamics of a two-particle system. Non-linear terms are found
up to second-order order in {\kappa} in the general case, and to every order in
the... | [
{
"created": "Thu, 21 Oct 2010 20:00:10 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2010 21:00:01 GMT",
"version": "v2"
}
] | 2010-12-01 | [
[
"Yale",
"Alexandre",
""
],
[
"Mann",
"R. B.",
""
],
[
"Ohta",
"Tadayuki",
""
]
] | We study the dynamics of particles coupled to gravity in (2 + 1) dimensions. Using the ADM formalism, we derive the general Hamiltonian for an N-body system and analyze the dynamics of a two-particle system. Non-linear terms are found up to second-order order in {\kappa} in the general case, and to every order in the q... |
1302.6006 | Dong-han Yeom | Bum-Hoon Lee, Dong-han Yeom | Status report: black hole complementarity controversy | 5 pages, 4 figures; A proceeding for the 9th International Symposium
on Cosmology and Particle Astrophysics (CosPA2012). Talk on November 14,
2012, Taipei, Taiwan | Nucl.Phys.Proc.Suppl. 246-247 (2014) 178-182 | 10.1016/j.nuclphysbps.2013.10.082 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole complementarity was a consensus among string theorists for the
interpretation of the information loss problem. However, recently some authors
find inconsistency of black hole complementarity: large N rescaling and AMPS
argument. According to AMPS, the horizon should be a firewall so that one
cannot penetra... | [
{
"created": "Mon, 25 Feb 2013 06:52:46 GMT",
"version": "v1"
}
] | 2014-01-20 | [
[
"Lee",
"Bum-Hoon",
""
],
[
"Yeom",
"Dong-han",
""
]
] | Black hole complementarity was a consensus among string theorists for the interpretation of the information loss problem. However, recently some authors find inconsistency of black hole complementarity: large N rescaling and AMPS argument. According to AMPS, the horizon should be a firewall so that one cannot penetrate... |
gr-qc/9401033 | Andrew L. Berkin | Andrew L. Berkin and Ronald W. Hellings | Multiple Field Scalar-Tensor Theories of Gravity and Cosmology | 17 pages | Phys.Rev.D49:6442-6449,1994 | 10.1103/PhysRevD.49.6442 | null | gr-qc | null | We consider multiple scalar fields coupled to gravity, with special attention
given to two-field theories. First, the conditions necessary for these theories
to meet solar system tests are given. Next, we investigate the cosmological
evolution of the fields to see if these conditions can be met. Solutions are
found i... | [
{
"created": "Fri, 28 Jan 1994 23:22:26 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Berkin",
"Andrew L.",
""
],
[
"Hellings",
"Ronald W.",
""
]
] | We consider multiple scalar fields coupled to gravity, with special attention given to two-field theories. First, the conditions necessary for these theories to meet solar system tests are given. Next, we investigate the cosmological evolution of the fields to see if these conditions can be met. Solutions are found in ... |
1111.6854 | Ignacio F. Ranea-Sandoval | Gustavo Dotti, Reinaldo J. Gleiser, Ignacio F. Ranea-Sandoval | Instabilities in Kerr Spacetimes | 4 pages, proceedings of the First Caribbean Symposium on Nuclear and
Astroparticle Physics - STARS2011, La Habana, Cuba, 1-4 May 2011 | International Journal of Modern Physics E, Volume 20, Issue
supp01, pp. 27-31 (2011) | 10.1142/S0218301311040049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a generalization of previous results regarding the stability under
gravitational perturbations of nakedly singular super extreme Kerr spacetime
and Kerr black hole interior beyond the Cauchy horizon. To do so we study
solutions to the radial and angular Teukolsky's equations with different spin
weights, pa... | [
{
"created": "Tue, 29 Nov 2011 15:30:17 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2012 16:27:21 GMT",
"version": "v2"
}
] | 2012-08-10 | [
[
"Dotti",
"Gustavo",
""
],
[
"Gleiser",
"Reinaldo J.",
""
],
[
"Ranea-Sandoval",
"Ignacio F.",
""
]
] | We present a generalization of previous results regarding the stability under gravitational perturbations of nakedly singular super extreme Kerr spacetime and Kerr black hole interior beyond the Cauchy horizon. To do so we study solutions to the radial and angular Teukolsky's equations with different spin weights, part... |
1605.08877 | Sven Zschocke | Sven Zschocke | Light propagation in the gravitational field of N arbitrarily moving
bodies in the 1.5PN approximation for high-precision astrometry | 51 pages, 1 figure, 3 tables. arXiv admin note: text overlap with
arXiv:1509.07279 | Physical Review D 93 (2016) 103010 | 10.1103/PhysRevD.93.103010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High-precision astrometry on sub-micro-arcsecond level in angular resolution
requires accurate determination of the trajectory of a light-signal from the
celestial light source through the gravitational field of the Solar system
toward the observer. In this investigation the light trajectory in the
gravitational fiel... | [
{
"created": "Sat, 28 May 2016 11:18:21 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2016 13:00:31 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Jul 2017 14:28:41 GMT",
"version": "v3"
}
] | 2017-07-25 | [
[
"Zschocke",
"Sven",
""
]
] | High-precision astrometry on sub-micro-arcsecond level in angular resolution requires accurate determination of the trajectory of a light-signal from the celestial light source through the gravitational field of the Solar system toward the observer. In this investigation the light trajectory in the gravitational field ... |
2303.14451 | Titus K Mathew | Vishnu A Pai and Titus K Mathew | Near Equilibrium Constraints on Bulk Viscous Models in
$f(R,T)=R+2\lambda T$ Gravity | 13 pages and 6 figures | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | Recent studies indicate that, near equilibrium condition could not be
maintained for bulk viscous matter models during the accelerated expansion of
the universe in the context of Einstein's gravity, without including the
cosmological constant. But from our investigation in $f(R,T)$ gravity, it is
observed that, this ... | [
{
"created": "Sat, 25 Mar 2023 12:10:29 GMT",
"version": "v1"
}
] | 2023-03-28 | [
[
"Pai",
"Vishnu A",
""
],
[
"Mathew",
"Titus K",
""
]
] | Recent studies indicate that, near equilibrium condition could not be maintained for bulk viscous matter models during the accelerated expansion of the universe in the context of Einstein's gravity, without including the cosmological constant. But from our investigation in $f(R,T)$ gravity, it is observed that, this co... |
1710.07273 | Luis Granda | L. N. Granda, D. F. Jimenez | Dynamical analysis for a scalar-tensor model with kinetic and
non-minimal couplings | 30 pages, 2 figures, submitted to IJMPD. arXiv admin note:
substantial text overlap with arXiv:1710.04760 | null | 10.1142/S021827181850030X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the autonomous system for a scalar-tensor model of dark energy with
non-minimal coupling to curvature and non-minimal kinetic coupling to the
Einstein tensor. The critical points describe important stable asymptotic
scenarios including quintessence, phantom and de Sitter attractor solutions.
Two functional f... | [
{
"created": "Wed, 18 Oct 2017 23:10:43 GMT",
"version": "v1"
}
] | 2018-02-28 | [
[
"Granda",
"L. N.",
""
],
[
"Jimenez",
"D. F.",
""
]
] | We study the autonomous system for a scalar-tensor model of dark energy with non-minimal coupling to curvature and non-minimal kinetic coupling to the Einstein tensor. The critical points describe important stable asymptotic scenarios including quintessence, phantom and de Sitter attractor solutions. Two functional for... |
0911.1625 | Julien Grain | J. Grain | Loop Quantum Cosmology corrections on gravity waves produced during
primordial inflation | to be published in the AIP Proceedings of the 'Invisible Universe
International Conference', UNESCO-Paris, June 29-July 3, 2009; 9 pp., 4 Figs | AIP Conf.Proc.1241:600-608,2010 | 10.1063/1.3462691 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop Quantum Gravity (L.Q.G.) is one of the two most promising tentative
theory for a quantum description of gravity. When applied to the entire
universe, the so-called Loop Quantum Cosmology (L.Q.C.) framework offers
microscopical models of the very early stages of the cosmological history,
potentially solving the i... | [
{
"created": "Mon, 9 Nov 2009 10:27:07 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Grain",
"J.",
""
]
] | Loop Quantum Gravity (L.Q.G.) is one of the two most promising tentative theory for a quantum description of gravity. When applied to the entire universe, the so-called Loop Quantum Cosmology (L.Q.C.) framework offers microscopical models of the very early stages of the cosmological history, potentially solving the ini... |
1907.10950 | Alkiviadis Triantafyllopoulos | Satoshi Ikeda, Emmanuel N. Saridakis, Panayiotis C. Stavrinos and
Alkiviadis Triantafyllopoulos | Cosmology of Lorentz fiber-bundle induced scalar-tensor theories | 12 pages, 2 figures, version published in Phys. Rev. D | Phys. Rev. D 100, 124035 (2019) | 10.1103/PhysRevD.100.124035 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmological applications of scalar-tensor theories that
arise effectively from the Lorentz fiber bundle of a Finsler-like geometry. We
first show that the involved nonlinear connection induces a new scalar degree
of freedom and eventually a scalar-tensor theory. Using both a holonomic and a
nonhol... | [
{
"created": "Thu, 25 Jul 2019 10:29:03 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2019 17:50:06 GMT",
"version": "v2"
}
] | 2019-12-20 | [
[
"Ikeda",
"Satoshi",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Stavrinos",
"Panayiotis C.",
""
],
[
"Triantafyllopoulos",
"Alkiviadis",
""
]
] | We investigate the cosmological applications of scalar-tensor theories that arise effectively from the Lorentz fiber bundle of a Finsler-like geometry. We first show that the involved nonlinear connection induces a new scalar degree of freedom and eventually a scalar-tensor theory. Using both a holonomic and a nonholon... |
2109.10840 | Maciek Wielgus | Maciek Wielgus | Photon rings of spherically symmetric black holes and robust tests of
non-Kerr metrics | accepted in PRD | Phys. Rev. D 104, 124058 (2021) | 10.1103/PhysRevD.104.124058 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Under very general assumptions on the accretion flow geometry, images of a
black hole illuminated by electromagnetic radiation display a sequence of
photon rings (demagnified and rotated copies of the direct image) which
asymptotically approach a purely theoretical critical curve - the outline of
the black hole photo... | [
{
"created": "Wed, 22 Sep 2021 17:02:17 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Dec 2021 02:57:18 GMT",
"version": "v2"
}
] | 2024-07-24 | [
[
"Wielgus",
"Maciek",
""
]
] | Under very general assumptions on the accretion flow geometry, images of a black hole illuminated by electromagnetic radiation display a sequence of photon rings (demagnified and rotated copies of the direct image) which asymptotically approach a purely theoretical critical curve - the outline of the black hole photon ... |
gr-qc/0102057 | Hitoshi Kitada | Hitoshi Kitada (University of Tokyo) | Quantum Mechanical Clock and Classical Relativistic Clock | LaTeX, 8 pages | null | null | KIMS-2001-02-11 | gr-qc | null | A cyclic nature of quantum mechanical clock is discussed as ``quantization of
time." Quantum mechanical clock is seen to be equivalent to the relativistic
classical clock.
| [
{
"created": "Tue, 13 Feb 2001 07:44:57 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Mar 2001 00:11:47 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Mar 2001 06:05:24 GMT",
"version": "v3"
},
{
"created": "Wed, 14 Mar 2001 06:36:51 GMT",
"version": "v4"
},
{
"cr... | 2007-05-23 | [
[
"Kitada",
"Hitoshi",
"",
"University of Tokyo"
]
] | A cyclic nature of quantum mechanical clock is discussed as ``quantization of time." Quantum mechanical clock is seen to be equivalent to the relativistic classical clock. |
1312.5004 | David Radice | David Radice and Luciano Rezzolla and Filippo Galeazzi | High-Order Fully General-Relativistic Hydrodynamics: new Approaches and
Tests | 34 pages, 16 figures. Version accepted on CQG | Class. Quantum Grav. 31 075012 (2014) | 10.1088/0264-9381/31/7/075012 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new approach for achieving high-order convergence in fully
general-relativistic hydrodynamic simulations. The approach is implemented in
WhiskyTHC, a new code that makes use of state-of-the-art numerical schemes and
was key in achieving, for the first time, higher than second-order convergence
in the cal... | [
{
"created": "Tue, 17 Dec 2013 23:36:43 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2014 17:59:38 GMT",
"version": "v2"
}
] | 2014-03-11 | [
[
"Radice",
"David",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Galeazzi",
"Filippo",
""
]
] | We present a new approach for achieving high-order convergence in fully general-relativistic hydrodynamic simulations. The approach is implemented in WhiskyTHC, a new code that makes use of state-of-the-art numerical schemes and was key in achieving, for the first time, higher than second-order convergence in the calcu... |
2406.03191 | Eric Poisson | Tom Cadogan and Eric Poisson | Self-gravitating anisotropic fluid. II: Newtonian theory | 40 pages, 7 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is the second in a sequence of three devoted to the formulation of
a theory of self-gravitating anisotropic fluids in both Newtonian gravity and
general relativity. In this second paper we develop the Newtonian theory,
inspired by a real-life example of an anisotropic fluid, the (nematic) liquid
crystal. W... | [
{
"created": "Wed, 5 Jun 2024 12:21:11 GMT",
"version": "v1"
}
] | 2024-06-06 | [
[
"Cadogan",
"Tom",
""
],
[
"Poisson",
"Eric",
""
]
] | This paper is the second in a sequence of three devoted to the formulation of a theory of self-gravitating anisotropic fluids in both Newtonian gravity and general relativity. In this second paper we develop the Newtonian theory, inspired by a real-life example of an anisotropic fluid, the (nematic) liquid crystal. We ... |
1904.05885 | Muhammad Sharif | M. Sharif and Arfa Waseem | Stellar Evolution of Compact Stars in Curvature-Matter Coupling Gravity | 21 pages, 9 figures, to appear in PTEP | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to the study of stellar evolution of compact objects
whose energy density and pressure of the fluid are interlinked by means of MIT
bag model and a realistic polytropic equation of state in the scenario of
$f(R,T,Q)$ gravity, where $Q=R_{ab}T^{ab}$. We derive the field equations as
well as the h... | [
{
"created": "Thu, 11 Apr 2019 02:58:38 GMT",
"version": "v1"
}
] | 2019-04-15 | [
[
"Sharif",
"M.",
""
],
[
"Waseem",
"Arfa",
""
]
] | This paper is devoted to the study of stellar evolution of compact objects whose energy density and pressure of the fluid are interlinked by means of MIT bag model and a realistic polytropic equation of state in the scenario of $f(R,T,Q)$ gravity, where $Q=R_{ab}T^{ab}$. We derive the field equations as well as the hyd... |
gr-qc/0004014 | Israel Quiroz | Israel Quiros (Departamento de Fisica. Universidad Central de Las
Villas. Santa Clara. Cuba) | Transformations of units and world's geometry | 30 pages, Revtex, no figures. New material and references added | null | null | null | gr-qc hep-th | null | The issue of the transformations of units is treated, mainly, in a
geometrical context. It is shown that Weyl-integrable geometry is a consistent
framework for the formulation of the gravitational laws since the basic law on
which this geometry rests is invariant under point-dependent transformations of
units. Rieman... | [
{
"created": "Wed, 5 Apr 2000 02:01:08 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Oct 2000 15:02:15 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Oct 2000 22:04:39 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Quiros",
"Israel",
"",
"Departamento de Fisica. Universidad Central de Las\n Villas. Santa Clara. Cuba"
]
] | The issue of the transformations of units is treated, mainly, in a geometrical context. It is shown that Weyl-integrable geometry is a consistent framework for the formulation of the gravitational laws since the basic law on which this geometry rests is invariant under point-dependent transformations of units. Riemann ... |
0710.1192 | Gerard Clement | Gerard Clement | The symmetries of five-dimensional minimal supergravity reduced to three
dimensions | 25 pages, typo corrected in Eq. (5.33) | J.Math.Phys.49:042503,2008; Erratum-ibid.49:079901,2008 | 10.1063/1.2907863 10.1063/1.2963308 | LAPTH-1209/07 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 14 Killing vectors of the target space for five-dimensional minimal
supergravity reduced to three dimensions are explicitly constructed in terms of
the original field variables. These vectors generate the Lie algebra of $G_2$.
We also construct a symmetrical $7\times7$ matrix representative of the coset
$G_{2(+2)... | [
{
"created": "Fri, 5 Oct 2007 11:30:04 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Mar 2008 11:50:14 GMT",
"version": "v2"
},
{
"created": "Sat, 7 Jun 2008 13:57:56 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Clement",
"Gerard",
""
]
] | The 14 Killing vectors of the target space for five-dimensional minimal supergravity reduced to three dimensions are explicitly constructed in terms of the original field variables. These vectors generate the Lie algebra of $G_2$. We also construct a symmetrical $7\times7$ matrix representative of the coset $G_{2(+2)}/... |
1907.03563 | Shambel Sahlu Akalu | Shambel Sahlu, Joseph Ntahompagaze, Amare Abebe, Alvaro de la
Cruz-Dombriz and David F. Mota | Scalar perturbations in $f(T)$ gravity using the $1+3$ covariant
approach | Published version | null | 10.1140/epjc/s10052-020-7961-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological scalar perturbations of standard matter are investigated in
the context of extended teleparallel $f(T)$ gravity theories using the $1+3$
covariant formalism. After a review of the background, gravitational field
equations of $f(T)$ gravity and the introduction of the covariant perturbation
variables,... | [
{
"created": "Mon, 8 Jul 2019 12:39:24 GMT",
"version": "v1"
},
{
"created": "Mon, 18 May 2020 13:14:41 GMT",
"version": "v2"
},
{
"created": "Tue, 19 May 2020 05:33:03 GMT",
"version": "v3"
},
{
"created": "Sat, 23 May 2020 10:05:47 GMT",
"version": "v4"
}
] | 2020-06-24 | [
[
"Sahlu",
"Shambel",
""
],
[
"Ntahompagaze",
"Joseph",
""
],
[
"Abebe",
"Amare",
""
],
[
"de la Cruz-Dombriz",
"Alvaro",
""
],
[
"Mota",
"David F.",
""
]
] | The cosmological scalar perturbations of standard matter are investigated in the context of extended teleparallel $f(T)$ gravity theories using the $1+3$ covariant formalism. After a review of the background, gravitational field equations of $f(T)$ gravity and the introduction of the covariant perturbation variables, t... |
1406.5915 | Ettore Minguzzi | E. Minguzzi | The vacuum conservation theorem | 9 pages. v2,v3: fixed some typos | Gen. Relat. Gravit. 47, (2015) 32 | 10.1007/s10714-015-1878-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A version of the vacuum conservation theorem is proved which does not assume
the existence of a time function nor demands stronger properties than the
dominant energy condition. However, it is shown that a stronger stable version
plays a role in the study of compact Cauchy horizons.
| [
{
"created": "Mon, 23 Jun 2014 14:17:02 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Dec 2014 12:30:05 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Feb 2015 18:58:55 GMT",
"version": "v3"
}
] | 2015-04-10 | [
[
"Minguzzi",
"E.",
""
]
] | A version of the vacuum conservation theorem is proved which does not assume the existence of a time function nor demands stronger properties than the dominant energy condition. However, it is shown that a stronger stable version plays a role in the study of compact Cauchy horizons. |
gr-qc/9405060 | Andrew Abrahams | Andrew M. Abrahams, Stuart L. Shapiro, and Saul A. Teukolsky | Disk collapse in general relativity | CRSR 1072, 10 pages (RevTex 3.0 with 9 uuencoded figures) | Phys.Rev.D50:7282-7291,1994 | 10.1103/PhysRevD.50.7282 | null | gr-qc | null | The radial collapse of a homogeneous disk of collisionless particles can be
solved analytically in Newtonian gravitation. To solve the problem in general
relativity, however, requires the full machinery of numerical relativity. The
collapse of a disk is the simplest problem that exhibits the two most
significant and ... | [
{
"created": "Wed, 25 May 1994 18:04:29 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Abrahams",
"Andrew M.",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | The radial collapse of a homogeneous disk of collisionless particles can be solved analytically in Newtonian gravitation. To solve the problem in general relativity, however, requires the full machinery of numerical relativity. The collapse of a disk is the simplest problem that exhibits the two most significant and ch... |
2403.06053 | Eugenio Bianchi | Eugenio Bianchi and Monica Rincon-Ramirez | Spinfoams, $\gamma$-duality and parity violation in primordial
gravitational waves | 16 pages, 2 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Barbero-Immirzi parameter $\gamma$ appears as a coupling constant in the
spinfoam dynamics of loop quantum gravity and can be understood as a measure of
gravitational parity violation via a duality rotation. We investigate an
effective field theory for gravity and a scalar field, with dynamics given by a
$\gamma$... | [
{
"created": "Sun, 10 Mar 2024 00:46:59 GMT",
"version": "v1"
}
] | 2024-03-12 | [
[
"Bianchi",
"Eugenio",
""
],
[
"Rincon-Ramirez",
"Monica",
""
]
] | The Barbero-Immirzi parameter $\gamma$ appears as a coupling constant in the spinfoam dynamics of loop quantum gravity and can be understood as a measure of gravitational parity violation via a duality rotation. We investigate an effective field theory for gravity and a scalar field, with dynamics given by a $\gamma$-d... |
2006.16804 | James Bardeen | James M. Bardeen | Black holes to white holes I. A complete quasi-classical model | 24 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1811.06683 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the first of two papers presenting different versions of
quasi-classical toy models for the non-singular evolution of the geometry and
the associated effective stress-energy tensor for a spherically symmetric black
hole that evolves into a white hole and eventually disappears after evaporating
down to the Pla... | [
{
"created": "Mon, 29 Jun 2020 00:15:03 GMT",
"version": "v1"
}
] | 2020-07-01 | [
[
"Bardeen",
"James M.",
""
]
] | This is the first of two papers presenting different versions of quasi-classical toy models for the non-singular evolution of the geometry and the associated effective stress-energy tensor for a spherically symmetric black hole that evolves into a white hole and eventually disappears after evaporating down to the Planc... |
gr-qc/9809046 | Piotr Jaranowski | Piotr Jaranowski and Andrzej Kr\'olak | Data analysis of gravitational-wave signals from spinning neutron stars.
II. Accuracy of estimation of parameters | LaTeX, 34 pages, 15 figures, submitted to Phys. Rev. D | Phys.Rev. D59 (1999) 063003 | 10.1103/PhysRevD.59.063003 | null | gr-qc | null | We examine the accuracy of estimation of parameters of the gravitational-wave
signals from spinning neutron stars that can be achieved from observations by
Earth-based laser interferometers. We consider a model of the signal consisting
of two narrowband components and including both phase and amplitude modulation.
We... | [
{
"created": "Tue, 15 Sep 1998 15:55:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Jaranowski",
"Piotr",
""
],
[
"Królak",
"Andrzej",
""
]
] | We examine the accuracy of estimation of parameters of the gravitational-wave signals from spinning neutron stars that can be achieved from observations by Earth-based laser interferometers. We consider a model of the signal consisting of two narrowband components and including both phase and amplitude modulation. We c... |
0911.0510 | Muhammad Sharif | M. Sharif and Asma Rafique | Hot Plasma Waves in Schwarzschild Magnetosphere | 27 pages, 11 figures, accepted for publication in Astrophys. Space Sc | Astrophys.Space Sci.325:227-240,2010 | 10.1007/s10509-009-0183-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we examine the wave properties of hot plasma living in
Schwarzschild magnetosphere. The 3+1 GRMHD perturbation equations are
formulated for this scenario. These equations are Fourier analyzed and then
solved numerically to obtain the dispersion relations for non-rotating,
rotating non-magnetized and rot... | [
{
"created": "Tue, 3 Nov 2009 07:17:41 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Sharif",
"M.",
""
],
[
"Rafique",
"Asma",
""
]
] | In this paper we examine the wave properties of hot plasma living in Schwarzschild magnetosphere. The 3+1 GRMHD perturbation equations are formulated for this scenario. These equations are Fourier analyzed and then solved numerically to obtain the dispersion relations for non-rotating, rotating non-magnetized and rotat... |
2310.06033 | Dongjun Li | Dongjun Li, Asad Hussain, Pratik Wagle, Yanbei Chen, Nicol\'as Yunes,
Aaron Zimmerman | Isospectrality breaking in the Teukolsky formalism | 29 pages | null | null | UTWI-14-2023 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity, though the most successful theory of gravity, has been
continuously modified to resolve its incompatibility with quantum mechanics and
explain the origin of dark energy or dark matter. One way to test these
modified gravity theories is to study the gravitational waves emitted during
the ringdown o... | [
{
"created": "Mon, 9 Oct 2023 18:00:04 GMT",
"version": "v1"
}
] | 2023-10-11 | [
[
"Li",
"Dongjun",
""
],
[
"Hussain",
"Asad",
""
],
[
"Wagle",
"Pratik",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Yunes",
"Nicolás",
""
],
[
"Zimmerman",
"Aaron",
""
]
] | General relativity, though the most successful theory of gravity, has been continuously modified to resolve its incompatibility with quantum mechanics and explain the origin of dark energy or dark matter. One way to test these modified gravity theories is to study the gravitational waves emitted during the ringdown of ... |
1008.2716 | Jose M. M. Senovilla | Jos\'e M. M. Senovilla | Algebraic classification of the Weyl tensor in higher dimensions based
on its "superenergy" tensor | 9 pages. Many errata corrected, including a computational mistake
with relevant consequences. I have highlighted all the changes in a different
color (blue). The main changes concern point (iv) in Proposition 1, and its
consequences concerning the characterization of types III, II and D. A
reference has been ad... | Class.Quant.Grav.27:222001,2010; Erratum-ibid.28:129501,2011 | 10.1088/0264-9381/27/22/222001 10.1088/0264-9381/28/12/129501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The algebraic classification of the Weyl tensor in arbitrary dimension n is
recovered by means of the principal directions of its "superenergy" tensor.
This point of view can be helpful in order to compute the Weyl aligned null
directions explicitly, and permits to obtain the algebraic type of the Weyl
tensor by comp... | [
{
"created": "Mon, 16 Aug 2010 17:23:11 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2011 16:49:57 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Mar 2011 10:55:42 GMT",
"version": "v3"
}
] | 2011-05-13 | [
[
"Senovilla",
"José M. M.",
""
]
] | The algebraic classification of the Weyl tensor in arbitrary dimension n is recovered by means of the principal directions of its "superenergy" tensor. This point of view can be helpful in order to compute the Weyl aligned null directions explicitly, and permits to obtain the algebraic type of the Weyl tensor by comput... |
2405.00403 | Suman Kumar Panja | Bhagya. R, Harsha Sreekumar and Suman Kumar Panja | Maximal acceleration in Rainbow gravity | 12 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we derive maximal acceleration of a massive particle in
Rainbow gravity. Using eight-dimensional phase-space metric compatible with
Rainbow gravity, we obtain the maximal acceleration, valid up to first order in
the Rainbow gravity parameter $\eta$. Using the positivity condition on maximal
acceleratio... | [
{
"created": "Wed, 1 May 2024 09:12:22 GMT",
"version": "v1"
}
] | 2024-05-02 | [
[
"R",
"Bhagya.",
""
],
[
"Sreekumar",
"Harsha",
""
],
[
"Panja",
"Suman Kumar",
""
]
] | In this paper, we derive maximal acceleration of a massive particle in Rainbow gravity. Using eight-dimensional phase-space metric compatible with Rainbow gravity, we obtain the maximal acceleration, valid up to first order in the Rainbow gravity parameter $\eta$. Using the positivity condition on maximal acceleration,... |
2004.08855 | Aurelien Barrau | Aur\'elien Barrau | Editorial to the special issue "probing new physics with black holes" | null | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes are fantastic laboratories to probe new physics. Both
theoretically and experimentally, many new ideas are emerging to use them as
tools for understanding better quantum gravity or classical gravity beyond
general relativity. I briefly review some new results.
| [
{
"created": "Sun, 19 Apr 2020 13:55:08 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2020 11:06:56 GMT",
"version": "v2"
}
] | 2020-04-22 | [
[
"Barrau",
"Aurélien",
""
]
] | Black holes are fantastic laboratories to probe new physics. Both theoretically and experimentally, many new ideas are emerging to use them as tools for understanding better quantum gravity or classical gravity beyond general relativity. I briefly review some new results. |
gr-qc/0104084 | Luc Blanchet | Luc Blanchet | Post-Newtonian Computation of Binary Inspiral Waveforms | In Gravitational Waves, Proceedings of the Como School on
Gravitational Waves in Astrophysics, I. Ciufolini, V. Gorini, U. Moschella
and P. Fre (eds.), Institute of Physics Publishing (2001) | null | null | null | gr-qc | null | Contents: I. Introduction; II. Summary of optimal signal filtering; III.
Newtonian binary polarization waveforms; IV. Newtonian orbital phase evolution;
V. Post-Newtonian wave-generation; VI. Inspiral binary waveform.
| [
{
"created": "Wed, 25 Apr 2001 18:53:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blanchet",
"Luc",
""
]
] | Contents: I. Introduction; II. Summary of optimal signal filtering; III. Newtonian binary polarization waveforms; IV. Newtonian orbital phase evolution; V. Post-Newtonian wave-generation; VI. Inspiral binary waveform. |
1607.05328 | Allan Alinea | Allan L. Alinea | Adiabatic regularisation of power spectra in nonminimally coupled
chaotic inflation | version 4, 17 pages, corrected errors in some equations (minor
corrections) | JCAP 10 (2016) 027 | 10.1088/1475-7516/2016/10/027 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effect of adiabatic regularization on both the tensor- and
scalar-perturbation power spectra in \textit{nonminimally} coupled chaotic
inflation. Similar to that of the \textit{minimally} coupled general
single-field inflation, we find that the subtraction term is suppressed by an
exponentially deca... | [
{
"created": "Fri, 15 Jul 2016 06:23:29 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2016 04:40:55 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Sep 2016 06:47:41 GMT",
"version": "v3"
},
{
"created": "Sun, 18 Dec 2016 09:24:27 GMT",
"version": "v4"
}
] | 2016-12-20 | [
[
"Alinea",
"Allan L.",
""
]
] | We investigate the effect of adiabatic regularization on both the tensor- and scalar-perturbation power spectra in \textit{nonminimally} coupled chaotic inflation. Similar to that of the \textit{minimally} coupled general single-field inflation, we find that the subtraction term is suppressed by an exponentially decayi... |
1411.5201 | Xiangdong Zhang | Xiangdong Zhang | Loop quantum cosmology in 2+1 dimension | 13 pages, typos fixed | Phys. Rev. D 90, 124018 (2014) | 10.1103/PhysRevD.90.124018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a first step to generalize the structure of loop quantum cosmology to the
theories with the spacetime dimension other than four, the isotropic model of
loop quantum cosmology in 2+1 dimension is studied in this paper. We find that
the classical big bang singularity is again replaced by a quantum bounce in the
mode... | [
{
"created": "Wed, 19 Nov 2014 12:40:55 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jun 2015 09:24:38 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jun 2015 09:30:51 GMT",
"version": "v3"
}
] | 2015-06-23 | [
[
"Zhang",
"Xiangdong",
""
]
] | As a first step to generalize the structure of loop quantum cosmology to the theories with the spacetime dimension other than four, the isotropic model of loop quantum cosmology in 2+1 dimension is studied in this paper. We find that the classical big bang singularity is again replaced by a quantum bounce in the model.... |
2002.12233 | Shuxuan Ying | Peng Wang, Houwen Wu, Shuxuan Ying | Validity of Thermodynamic Laws and Weak Cosmic Censorship for AdS Black
Holes and Black Holes in a Cavity | v3:21 pages, references added, version to appear in Chinese Physics C | null | 10.1088/1674-1137/abeb5e | CTP-SCU/2020003 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By throwing a test charged particle into a Reissner-Nordstrom (RN) black
hole, we test the validity of the first and second laws of thermodynamics and
weak cosmic censorship conjecture (WCCC) with two types of boundary conditions,
i.e., the asymptotically anti-de Sitter (AdS) space and a Dirichlet cavity wall
placed ... | [
{
"created": "Thu, 27 Feb 2020 16:24:02 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Mar 2020 16:00:17 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Mar 2021 09:30:29 GMT",
"version": "v3"
}
] | 2021-03-04 | [
[
"Wang",
"Peng",
""
],
[
"Wu",
"Houwen",
""
],
[
"Ying",
"Shuxuan",
""
]
] | By throwing a test charged particle into a Reissner-Nordstrom (RN) black hole, we test the validity of the first and second laws of thermodynamics and weak cosmic censorship conjecture (WCCC) with two types of boundary conditions, i.e., the asymptotically anti-de Sitter (AdS) space and a Dirichlet cavity wall placed in... |
1609.09825 | Song Ming Du | Song Ming Du and Atsushi Nishizawa | Gravitational Wave Memory: A New Approach to Study Modified Gravity | 5 pages, 4 figures | Phys. Rev. D 94, 104063 (2016) | 10.1103/PhysRevD.94.104063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that two types of gravitational wave memory exist in general
relativity (GR): the linear memory and the non-linear, or Christodoulou memory.
These effects, especially the latter, depend on the specific form of Einstein
equation. It can then be speculated that in modified theories of gravity, the
memo... | [
{
"created": "Fri, 30 Sep 2016 17:25:25 GMT",
"version": "v1"
}
] | 2016-12-07 | [
[
"Du",
"Song Ming",
""
],
[
"Nishizawa",
"Atsushi",
""
]
] | It is well known that two types of gravitational wave memory exist in general relativity (GR): the linear memory and the non-linear, or Christodoulou memory. These effects, especially the latter, depend on the specific form of Einstein equation. It can then be speculated that in modified theories of gravity, the memory... |
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