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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1503.07418 | Behnam Pourhassan | B. Pourhassan, Mir Faizal | Thermal Fluctuations in a Charged AdS Black Hole | 11 pages, Accepted for publication in EPL | Europhys. Lett. 111: 40006, 2015 | 10.1209/0295-5075/111/40006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we will analyze the effects of thermal fluctuations on a
charged AdS black hole. This will be done by analyzing the corrections to black
hole thermodynamics due to these thermal fluctuations. We will demonstrate that
the entropy of this black hole get corrected by logarithmic term. We will also
calcula... | [
{
"created": "Sun, 22 Mar 2015 06:38:53 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2015 06:46:10 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Aug 2015 19:51:40 GMT",
"version": "v3"
}
] | 2015-09-30 | [
[
"Pourhassan",
"B.",
""
],
[
"Faizal",
"Mir",
""
]
] | In this paper, we will analyze the effects of thermal fluctuations on a charged AdS black hole. This will be done by analyzing the corrections to black hole thermodynamics due to these thermal fluctuations. We will demonstrate that the entropy of this black hole get corrected by logarithmic term. We will also calculate... |
2302.06387 | Gustav Holzegel | Gustav Holzegel and Christopher Kauffman | The wave equation on subextremal Kerr spacetimes with small non-decaying
first order terms | 75 pages, 2 figures | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the perturbed covariant wave equation $\Box_{g_{M,a}} \Psi =
\varepsilon \mathbf{B} \Psi$ on the exterior of a fixed subextremal Kerr
spacetime $\left(\mathcal{M},g_{M,a}\right)$. Here $\mathbf{B}$ is a suitably
regular first order differential operator respecting the symmetries of Kerr
whose coefficients... | [
{
"created": "Mon, 13 Feb 2023 14:31:03 GMT",
"version": "v1"
}
] | 2023-02-14 | [
[
"Holzegel",
"Gustav",
""
],
[
"Kauffman",
"Christopher",
""
]
] | We consider the perturbed covariant wave equation $\Box_{g_{M,a}} \Psi = \varepsilon \mathbf{B} \Psi$ on the exterior of a fixed subextremal Kerr spacetime $\left(\mathcal{M},g_{M,a}\right)$. Here $\mathbf{B}$ is a suitably regular first order differential operator respecting the symmetries of Kerr whose coefficients a... |
1705.00087 | Sergio Guti\'errez | Sergio Guti\'errez, Belen Carvente, Abel Camacho | Mass bounds for Newtonian bosonic starts in theory of ultra-cold gases | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work we address the issue concerning the relation mass versus
radius for bosonic stars, all this in the context of the theory of ultra-cold
gases in the dilute regime and within the realm of Newtonian gravity. It will
be shown that this model predicts a minimum and a maximum for the mass of this
kind o... | [
{
"created": "Fri, 28 Apr 2017 22:30:30 GMT",
"version": "v1"
}
] | 2017-05-02 | [
[
"Gutiérrez",
"Sergio",
""
],
[
"Carvente",
"Belen",
""
],
[
"Camacho",
"Abel",
""
]
] | In the present work we address the issue concerning the relation mass versus radius for bosonic stars, all this in the context of the theory of ultra-cold gases in the dilute regime and within the realm of Newtonian gravity. It will be shown that this model predicts a minimum and a maximum for the mass of this kind of ... |
gr-qc/0607014 | Laurent Freidel | L. Freidel, J. Kowalski--Glikman and A. Starodubtsev | Particles as Wilson lines of gravitational field | 19 pages, some number of comments and clarifications added, to be
published in Phys. Rev. D | Phys.Rev. D74 (2006) 084002 | 10.1103/PhysRevD.74.084002 | null | gr-qc | null | Since the work of Mac-Dowell-Mansouri it is well known that gravity can be
written as a gauge theory for the de Sitter group. In this paper we consider
the coupling of this theory to the simplest gauge invariant observables that
is, Wilson lines. The dynamics of these Wilson lines is shown to reproduce
exactly the dy... | [
{
"created": "Tue, 4 Jul 2006 23:13:44 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Sep 2006 06:30:06 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Freidel",
"L.",
""
],
[
"Kowalski--Glikman",
"J.",
""
],
[
"Starodubtsev",
"A.",
""
]
] | Since the work of Mac-Dowell-Mansouri it is well known that gravity can be written as a gauge theory for the de Sitter group. In this paper we consider the coupling of this theory to the simplest gauge invariant observables that is, Wilson lines. The dynamics of these Wilson lines is shown to reproduce exactly the dyna... |
1910.13452 | Rodrigo Panosso Macedo | Rodrigo Panosso Macedo | Hyperboloidal framework for the Kerr spacetime | 30 pages. Match published version | Classical and Quantum Gravity, Volume 37, Number 6 (2020) | 10.1088/1361-6382/ab6e3e | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the need of a robust geometrical framework for the calculation
of long, and highly accurate waveforms for extreme-mass-ratio inspirals, this
work presents an extensive study of the hyperboloidal formalism for the Kerr
spacetime and the Teukolsky equation. In a first step, we introduce a generic
coordinat... | [
{
"created": "Tue, 29 Oct 2019 18:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Mar 2020 13:35:55 GMT",
"version": "v2"
}
] | 2020-03-09 | [
[
"Macedo",
"Rodrigo Panosso",
""
]
] | Motivated by the need of a robust geometrical framework for the calculation of long, and highly accurate waveforms for extreme-mass-ratio inspirals, this work presents an extensive study of the hyperboloidal formalism for the Kerr spacetime and the Teukolsky equation. In a first step, we introduce a generic coordinate ... |
0704.2099 | Muhammad Sharif | M. Sharif and M. Jamil Amir | Teleparallel Energy-Momentum Distribution of Static Axially Symmetric
Spacetimes | 14 pages, accepted for publication in Mod. Phys. Lett. A | Mod.Phys.Lett.A23:3167-3177,2008 | 10.1142/S0217732308027035 | null | gr-qc | null | This paper is devoted to discuss the energy-momentum for static axially
symmetric spacetimes in the framework of teleparallel theory of gravity. For
this purpose, we use the teleparallel versions of Einstein, Landau-Lifshitz,
Bergmann and M$\ddot{o}$ller prescriptions. A comparison of the results shows
that the energ... | [
{
"created": "Tue, 17 Apr 2007 05:43:49 GMT",
"version": "v1"
}
] | 2009-02-10 | [
[
"Sharif",
"M.",
""
],
[
"Amir",
"M. Jamil",
""
]
] | This paper is devoted to discuss the energy-momentum for static axially symmetric spacetimes in the framework of teleparallel theory of gravity. For this purpose, we use the teleparallel versions of Einstein, Landau-Lifshitz, Bergmann and M$\ddot{o}$ller prescriptions. A comparison of the results shows that the energy ... |
1906.08761 | Thomas M\"adler | Emanuel Gallo, Thomas M\"adler | Comment on "Boosted Kerr black holes in general relativity" | null | Phys. Rev. D 101, 028501 (2020) | 10.1103/PhysRevD.101.028501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a recently presented boosted Kerr black hole solution which had
already been used by other authors. This boosted metric is based on wrong
assumptions regarding asymptotic inertial observers and moreover the performed
boost is not a proper Lorentz transformation. This note aims to clarify some of
the issues... | [
{
"created": "Thu, 20 Jun 2019 17:29:14 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Gallo",
"Emanuel",
""
],
[
"Mädler",
"Thomas",
""
]
] | We discuss a recently presented boosted Kerr black hole solution which had already been used by other authors. This boosted metric is based on wrong assumptions regarding asymptotic inertial observers and moreover the performed boost is not a proper Lorentz transformation. This note aims to clarify some of the issues w... |
1210.2577 | Aur\'elien Hees | A. Hees, S. Bertone and C. Le Poncin-Lafitte | Frequency shift up to the 2-PM approximation | 4 pages, submitted to proceedings of SF2A | null | null | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A lot of fundamental tests of gravitational theories rely on highly precise
measurements of the travel time and/or the frequency shift of electromagnetic
signals propagating through the gravitational field of the Solar System. In
practically all of the previous studies, the explicit expressions of such
travel times a... | [
{
"created": "Tue, 9 Oct 2012 12:04:44 GMT",
"version": "v1"
}
] | 2012-10-10 | [
[
"Hees",
"A.",
""
],
[
"Bertone",
"S.",
""
],
[
"Poncin-Lafitte",
"C. Le",
""
]
] | A lot of fundamental tests of gravitational theories rely on highly precise measurements of the travel time and/or the frequency shift of electromagnetic signals propagating through the gravitational field of the Solar System. In practically all of the previous studies, the explicit expressions of such travel times and... |
2205.08931 | Riasat Ali | Riasat Ali, Rimsha Babar and Muhammad Asgher | Gravitational Analysis of Rotating Charged Black Hole-Like Solution in
Einstein-Gauss-Bonnet Gravity | 14 pages,10 figures, version accepted for publication in Annalen der
Physik | Ann. Phys. (Berlin) 2022, 2200074 | 10.1002/andp.202200074 | andp.202200074 | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | This work analyzes the Einstein-Gauss-Bonnet gravity of charged black hole
solutions through Newman-Janis approach. The Hawking temperature for
corresponding black hole is also computed. The solution depends upon rotation
parameter $a$, black hole mass, charge and horizon. Moreover, the graphical
behavior of temperat... | [
{
"created": "Wed, 18 May 2022 13:55:39 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Aug 2022 10:12:13 GMT",
"version": "v2"
}
] | 2022-08-19 | [
[
"Ali",
"Riasat",
""
],
[
"Babar",
"Rimsha",
""
],
[
"Asgher",
"Muhammad",
""
]
] | This work analyzes the Einstein-Gauss-Bonnet gravity of charged black hole solutions through Newman-Janis approach. The Hawking temperature for corresponding black hole is also computed. The solution depends upon rotation parameter $a$, black hole mass, charge and horizon. Moreover, the graphical behavior of temperatur... |
gr-qc/9505005 | Mike Clayton | M. A. Clayton (Department of Physics, University of Toronto ON,
Canada) | Massive NGT and Spherically Symmetric Systems | `Final' version (minor changes have been made to the original), to be
published in J. Math. Phys. Typset using ReVTeX and amssymbols. 29 pages | J.Math.Phys.37:395-420,1996 | 10.1063/1.531397 | UTPT-95-09 | gr-qc | null | The arguments leading to the introduction of the massive Nonsymmetric
Gravitational action are reviewed \cite{Moffat:1994,Moffat:1995b}, leading to
an action that gives asymptotically well-behaved perturbations on GR
backgrounds. Through the analysis of spherically symmetric perturbations about
GR (Schwarzschild) and... | [
{
"created": "Thu, 4 May 1995 17:32:25 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 1995 19:28:26 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Clayton",
"M. A.",
"",
"Department of Physics, University of Toronto ON,\n Canada"
]
] | The arguments leading to the introduction of the massive Nonsymmetric Gravitational action are reviewed \cite{Moffat:1994,Moffat:1995b}, leading to an action that gives asymptotically well-behaved perturbations on GR backgrounds. Through the analysis of spherically symmetric perturbations about GR (Schwarzschild) and N... |
2208.01413 | Abdolhosein Khodam-Mohammadi | A. Khodam-Mohammadi | Unifying turnaround-bounce cosmology in a cyclic universe considering a
running vacuum model | 16 pages, 6 figures | Modern Physics Letters A, Vol. 37, No. 20, 2250127 (2022) | 10.1142/S0217732322501279 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Among many models which can describe the bouncing cosmology, A matter bounce
scenario that is deformed by a running vacuum model of dark energy (RVM-DE) has
been interested. In this research, I show that a class of RVM-CDM (cold dark
matter) model can also describe a cyclical cosmology in which the universe
undergoes... | [
{
"created": "Sun, 31 Jul 2022 08:36:18 GMT",
"version": "v1"
}
] | 2022-09-13 | [
[
"Khodam-Mohammadi",
"A.",
""
]
] | Among many models which can describe the bouncing cosmology, A matter bounce scenario that is deformed by a running vacuum model of dark energy (RVM-DE) has been interested. In this research, I show that a class of RVM-CDM (cold dark matter) model can also describe a cyclical cosmology in which the universe undergoes c... |
gr-qc/9404009 | R. Balasubramanian | R. Balasubramanian and S. V. Dhurandhar | Performance of Newtonian filters in detecting gravitational waves from
coalescing binaries | Revtex 9 pages + 6 figures ( Can be obtained by "anonymous" ftp from
144.16.31.1 in dir /pub/rbs. Submitted to Physical Review D. IUCAA 10 | Phys.Rev.D50:6080-6088,1994 | 10.1103/PhysRevD.50.6080 | null | gr-qc | null | Coalescing binary systems are one of the most promising sources of
gravitational waves. The technique of matched filtering used in the detection
of gravitational waves from coalescing binaries relies on the construction of
accurate templates. Until recently filters modelled on the quadrupole or the
Newtonian approxim... | [
{
"created": "Fri, 1 Apr 1994 21:58:25 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Balasubramanian",
"R.",
""
],
[
"Dhurandhar",
"S. V.",
""
]
] | Coalescing binary systems are one of the most promising sources of gravitational waves. The technique of matched filtering used in the detection of gravitational waves from coalescing binaries relies on the construction of accurate templates. Until recently filters modelled on the quadrupole or the Newtonian approximat... |
gr-qc/0202007 | Mauricio Bellini | Mauricio Bellini (IFM, Michoacana University) | Baryogensis in fresh inflation | 11 pages, no figures | Gen.Rel.Grav. 34 (2002) 2127-2134 | 10.1023/A:1021139602851 | null | gr-qc | null | I study the possibility of baryogenesis can take place in fresh inflation. I
find that it is possible that violation of baryon number conservation can occur
during the period out-of-equilibrium in this scenario. Indeed, baryogenesis
could be possible before the thermal equilibrium is restored at the end of
fresh infl... | [
{
"created": "Sat, 2 Feb 2002 20:40:36 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Bellini",
"Mauricio",
"",
"IFM, Michoacana University"
]
] | I study the possibility of baryogenesis can take place in fresh inflation. I find that it is possible that violation of baryon number conservation can occur during the period out-of-equilibrium in this scenario. Indeed, baryogenesis could be possible before the thermal equilibrium is restored at the end of fresh inflat... |
gr-qc/9605030 | Daniel Sudarsky | G.E. Matsas, D. Sudarsky, and A. Higuchi | Bremsstrahlung by static charges outside a static black hole ? | Latex file | null | null | null | gr-qc | null | We show that in complete analogy with the usual bremsstrahlung process, when
studied from the coaccelerated observer's point of view, a charge moving along
the integral curves of the static Killing field in the exterior of a static
black hole gives rise to the emission of zero-energy photons, induced by the
thermal b... | [
{
"created": "Thu, 16 May 1996 20:31:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Matsas",
"G. E.",
""
],
[
"Sudarsky",
"D.",
""
],
[
"Higuchi",
"A.",
""
]
] | We show that in complete analogy with the usual bremsstrahlung process, when studied from the coaccelerated observer's point of view, a charge moving along the integral curves of the static Killing field in the exterior of a static black hole gives rise to the emission of zero-energy photons, induced by the thermal bat... |
0903.1185 | Davood Momeni | Mohammad Mehrpooya, D. Momeni | Spherically symmetric massive scalar fields in GR | 7 pages,No figures,accepted for publication in "International journal
of modern physics A"(IJMPA) | Int.J.Mod.Phys. A25:1429-1438,2010 | 10.1142/S0217751X10048019 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First we review some of the attempts made to find exact spherically symmetric
solutions of Einstein field equations in the presence of scalar fields .Wyman
solution in both static and non static scalar field is discussed briefly and it
is show that why in the case of non static homogenous matter field, static
metric ... | [
{
"created": "Fri, 6 Mar 2009 10:39:11 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2009 13:58:21 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Oct 2009 07:59:10 GMT",
"version": "v3"
},
{
"created": "Mon, 26 Oct 2009 05:16:50 GMT",
"version": "v4"
},
{
"cr... | 2014-11-18 | [
[
"Mehrpooya",
"Mohammad",
""
],
[
"Momeni",
"D.",
""
]
] | First we review some of the attempts made to find exact spherically symmetric solutions of Einstein field equations in the presence of scalar fields .Wyman solution in both static and non static scalar field is discussed briefly and it is show that why in the case of non static homogenous matter field, static metric ca... |
1910.05747 | Rong-Jia Yang | Haiyuan Feng, Rong-Jia Yang | Horizon thermodynamics in $f(R,R^{\mu\nu}R_{\mu\nu})$ theory | 6 pages, no figures | Chin.Phys.C 44 (2020) 11, 115101 | 10.1088/1674-1137/abadef | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate whether the new horizon first law still holds in
$f(R,R^{\mu\nu}R_{\mu\nu})$ theory. For this complicated theory, we first
determine the entropy of black hole via Wald method, then we derive the energy
by using the new horizon first law, the degenerate Legendre transformation, and
the gravitational fie... | [
{
"created": "Sun, 13 Oct 2019 13:20:36 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Apr 2020 08:31:39 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Dec 2020 14:15:09 GMT",
"version": "v3"
}
] | 2020-12-04 | [
[
"Feng",
"Haiyuan",
""
],
[
"Yang",
"Rong-Jia",
""
]
] | We investigate whether the new horizon first law still holds in $f(R,R^{\mu\nu}R_{\mu\nu})$ theory. For this complicated theory, we first determine the entropy of black hole via Wald method, then we derive the energy by using the new horizon first law, the degenerate Legendre transformation, and the gravitational field... |
1302.5265 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Loop quantization of the Schwarzschild black hole | 4 pages, Revtex, version to appear in Physical Review Letters | Phys. Rev. Lett. 110, 211301 (2013) | 10.1103/PhysRevLett.110.211301 | LSU-REL-022113 | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We quantize spherically symmetric vacuum gravity without gauge fixing the
diffeomorphism constraint. Through a rescaling, we make the algebra of
Hamiltonian constraints Abelian and therefore the constraint algebra is a true
Lie algebra. This allows the completion of the Dirac quantization procedure
using loop quantum... | [
{
"created": "Thu, 21 Feb 2013 12:37:47 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 2013 17:35:38 GMT",
"version": "v2"
}
] | 2013-12-18 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | We quantize spherically symmetric vacuum gravity without gauge fixing the diffeomorphism constraint. Through a rescaling, we make the algebra of Hamiltonian constraints Abelian and therefore the constraint algebra is a true Lie algebra. This allows the completion of the Dirac quantization procedure using loop quantum g... |
2305.03064 | M. Ilyas | M. Ilyas, A. R. Athar, F. Khan and Asma Anfal | Effects of $f (R, G)$ gravity on anisotropic charged compact objects | texts modified, typos corrected, version accepted for
publication/published in Physica Scripta | Phys. Scr. 98 095011 (2023) | 10.1088/1402-4896/aceba2 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The present study provides an in-depth analysis of the anisotropic matter
distribution and various physical aspects of compact stars in the context of a
$f(R,G)$-gravity framework. In order to gain an exhaustive understanding of
these aspects, our study focuses on three particular compact stars: VELA X-1
(CS1), SAXJ1... | [
{
"created": "Thu, 4 May 2023 14:56:35 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Aug 2023 15:25:01 GMT",
"version": "v2"
}
] | 2023-08-22 | [
[
"Ilyas",
"M.",
""
],
[
"Athar",
"A. R.",
""
],
[
"Khan",
"F.",
""
],
[
"Anfal",
"Asma",
""
]
] | The present study provides an in-depth analysis of the anisotropic matter distribution and various physical aspects of compact stars in the context of a $f(R,G)$-gravity framework. In order to gain an exhaustive understanding of these aspects, our study focuses on three particular compact stars: VELA X-1 (CS1), SAXJ180... |
1503.06294 | Rakesh Tibrewala | Rakesh Tibrewala | Midisuperspace quantization: possibilities for fractional and emergent
spacetime dimensions | 10 pages | Phys. Rev. D 93, 124045 (2016) | 10.1103/PhysRevD.93.124045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, motivated by certain loop quantum gravity inspired corrections, it
was shown that for spherically symmetric midisuperspace models infinitely many
second derivative theories of gravity exist (as revealed by the presence of
three arbitrary functions in the corresponding Lagrangian/Hamiltonian) and not
just th... | [
{
"created": "Sat, 21 Mar 2015 12:37:59 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Jul 2016 04:50:09 GMT",
"version": "v2"
}
] | 2016-07-19 | [
[
"Tibrewala",
"Rakesh",
""
]
] | Recently, motivated by certain loop quantum gravity inspired corrections, it was shown that for spherically symmetric midisuperspace models infinitely many second derivative theories of gravity exist (as revealed by the presence of three arbitrary functions in the corresponding Lagrangian/Hamiltonian) and not just thos... |
2210.09237 | Pardyumn Kumar Sahoo | Gaurav N. Gadbail, Sanjay Mandal, P.K. Sahoo | Reconstruction of $\Lambda$CDM Universe in $f(Q)$ Gravity | PLB accepted version | Physics Letters B 835 (2022) 137509 | 10.1016/j.physletb.2022.137509 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this manuscript, we present a number of fascinating explicit
reconstructions for the $f(Q)$ gravity from the background of
Friedmann-La\^imatre-Robertson-Walker (FLRW) evolution history. We find the
more general functions of non-metricity scalar $Q$ that admit exact
$\Lambda$CDM expansion history. Adding extra deg... | [
{
"created": "Mon, 17 Oct 2022 16:31:58 GMT",
"version": "v1"
}
] | 2022-10-25 | [
[
"Gadbail",
"Gaurav N.",
""
],
[
"Mandal",
"Sanjay",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In this manuscript, we present a number of fascinating explicit reconstructions for the $f(Q)$ gravity from the background of Friedmann-La\^imatre-Robertson-Walker (FLRW) evolution history. We find the more general functions of non-metricity scalar $Q$ that admit exact $\Lambda$CDM expansion history. Adding extra degre... |
gr-qc/0003104 | W. M. Stuckey | W.M. Stuckey and Michael Silberstein | Uniform Spaces in the Pregeometric Modeling of Quantum Non-Separability | 17 pages, no figures; revised version submitted to Int. J. Theor.
Phys | null | null | null | gr-qc quant-ph | null | We introduce a pregeometry employing uniform spaces over the denumerable set
X of spacetime events. The discrete uniformity D_X over X is used to obtain a
pregeometric model of macroscopic spacetime neighborhoods. We then use a
uniformity base generated by a topological group structure over X to provide a
pregeometri... | [
{
"created": "Tue, 28 Mar 2000 20:49:49 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2001 14:03:29 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Stuckey",
"W. M.",
""
],
[
"Silberstein",
"Michael",
""
]
] | We introduce a pregeometry employing uniform spaces over the denumerable set X of spacetime events. The discrete uniformity D_X over X is used to obtain a pregeometric model of macroscopic spacetime neighborhoods. We then use a uniformity base generated by a topological group structure over X to provide a pregeometric ... |
1301.0959 | Roberto A. Sussman | Roberto A. Sussman | Weighed scalar averaging in LTB dust models, part II: a formalism of
exact perturbations | 31 pages IOP format, 12 figures. Matches version accepted for
publication in Classical and Quantum Gravity | Classical and Quantum Gravity, 30 (2013) 065016 | 10.1088/0264-9381/30/6/065016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the exact perturbations that arise from the q-average formalism
that was applied in the preceding article (part I) to Lemaitre-Tolman-Bondi
(LTB) models. By introducing an initial value parametrization, we show that all
LTB scalars that take a FLRW "look alike" form (frequently used in the
literature deali... | [
{
"created": "Sun, 6 Jan 2013 02:23:07 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2013 23:48:35 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Sussman",
"Roberto A.",
""
]
] | We examine the exact perturbations that arise from the q-average formalism that was applied in the preceding article (part I) to Lemaitre-Tolman-Bondi (LTB) models. By introducing an initial value parametrization, we show that all LTB scalars that take a FLRW "look alike" form (frequently used in the literature dealing... |
1504.02295 | Saulo Pereira H | S. H. Pereira, E. L. Mendon\c{c}a, A. Pinho S. S. and J. F. Jesus | Cosmological bounds on open FLRW solutions of massive gravity | 12 pages, 3 figures. Some references added and also new comments | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we have analysed some cosmological bounds concerning an open
FLRW solution of massive gravity. The constraints with recent observational
$H(z)$ data were found and the best fit values for the cosmological parameters
are in agreement with the $\Lambda$CDM model, and also point to a nearly open
spatial cur... | [
{
"created": "Thu, 9 Apr 2015 13:18:10 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2015 19:45:39 GMT",
"version": "v2"
}
] | 2015-07-01 | [
[
"Pereira",
"S. H.",
""
],
[
"Mendonça",
"E. L.",
""
],
[
"S.",
"A. Pinho S.",
""
],
[
"Jesus",
"J. F.",
""
]
] | In this work we have analysed some cosmological bounds concerning an open FLRW solution of massive gravity. The constraints with recent observational $H(z)$ data were found and the best fit values for the cosmological parameters are in agreement with the $\Lambda$CDM model, and also point to a nearly open spatial curva... |
1104.2413 | Tae Hoon Lee | Tae Hoon Lee | Degeneracy pressure of relic neutrinos and cosmic coincidence problem | 6 pages, added references | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the universe as a huge $\nu_R$-sphere formed with degenerate
relic neutrinos and suggest that its constant energy density play a role of an
effective cosmological constant. We construct the sphere as a bubble of true
vacuum in a field theory model with a spontaneously broken U(1) global
symmetry, and we i... | [
{
"created": "Wed, 13 Apr 2011 08:33:46 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Apr 2011 08:50:52 GMT",
"version": "v2"
}
] | 2011-04-19 | [
[
"Lee",
"Tae Hoon",
""
]
] | We consider the universe as a huge $\nu_R$-sphere formed with degenerate relic neutrinos and suggest that its constant energy density play a role of an effective cosmological constant. We construct the sphere as a bubble of true vacuum in a field theory model with a spontaneously broken U(1) global symmetry, and we int... |
1704.06630 | Fabio Duvan Lora Clavijo Mr. | Anamaria Navarro, F. D. Lora-Clavijo and Guillermo A. Gonz\'alez | Relativistic Static Thin Disks of Polarized Matter | 7 pages, 4 figures, 70 and 70 Gravitation Fest, 28 September 2016,
Cartagena, Colombia | J.Phys.Conf.Ser. 831 (2017) no.1, 012010 | 10.1088/1742-6596/831/1/012010 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An infinite family of exact solutions of the electrovacuum Einstein-Maxwell
equations is presented. The family is static, axially symmetric and describe
thin disks composed by electrically polarized material in a conformastatic
spacetime. The form of the conformastatic metric allows us to write down the
metric functi... | [
{
"created": "Fri, 21 Apr 2017 16:46:49 GMT",
"version": "v1"
}
] | 2017-04-24 | [
[
"Navarro",
"Anamaria",
""
],
[
"Lora-Clavijo",
"F. D.",
""
],
[
"González",
"Guillermo A.",
""
]
] | An infinite family of exact solutions of the electrovacuum Einstein-Maxwell equations is presented. The family is static, axially symmetric and describe thin disks composed by electrically polarized material in a conformastatic spacetime. The form of the conformastatic metric allows us to write down the metric function... |
2209.09091 | Ksh Newton Singh | Ksh. Newton Singh, S. K. Maurya, Piyali Bhar, Riju Nag | Anisotropic solution for polytropic stars in 4D Einstein-Gauss-Bonnet
gravity | 11 Pages, 10 Figures, 1 Table (to be appeared in EPJC) | null | 10.1140/epjc/s10052-022-10766-3 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the present work we have investigated a new anisotropic solution for
polytropic star in the framework of $4D$ Einstein-Gauss-Bonnet (EGB) gravity.
The possibility of determining the masses and radii of compact stars which puts
some limitations on equation of state (EoS) above the nuclear saturation
density. For th... | [
{
"created": "Wed, 14 Sep 2022 19:13:37 GMT",
"version": "v1"
}
] | 2022-09-20 | [
[
"Singh",
"Ksh. Newton",
""
],
[
"Maurya",
"S. K.",
""
],
[
"Bhar",
"Piyali",
""
],
[
"Nag",
"Riju",
""
]
] | In the present work we have investigated a new anisotropic solution for polytropic star in the framework of $4D$ Einstein-Gauss-Bonnet (EGB) gravity. The possibility of determining the masses and radii of compact stars which puts some limitations on equation of state (EoS) above the nuclear saturation density. For this... |
1609.00102 | Francisco Frutos-Alfaro Dr. rer. nat. | Francisco Frutos-Alfaro and Paulo Montero-Camacho | Approximate Kerr-Newman-like Metric with Quadrupole | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kerr metric is known to present issues when trying to find an interior
solution. In this work we continue in our efforts to construct a more realistic
exterior metric for astrophysical objects. A new approximate metric
representing the spacetime of a charged, rotating and slightly-deformed body is
obtained by per... | [
{
"created": "Thu, 1 Sep 2016 04:10:50 GMT",
"version": "v1"
}
] | 2016-09-02 | [
[
"Frutos-Alfaro",
"Francisco",
""
],
[
"Montero-Camacho",
"Paulo",
""
]
] | The Kerr metric is known to present issues when trying to find an interior solution. In this work we continue in our efforts to construct a more realistic exterior metric for astrophysical objects. A new approximate metric representing the spacetime of a charged, rotating and slightly-deformed body is obtained by pertu... |
1705.05807 | Ikjyot Singh Kohli | Ikjyot Singh Kohli | Oscillating Towards the de Sitter Universe | Corrected minor typos | null | null | null | gr-qc math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider spatially flat FLRW cosmological models in two
contexts in an attempt to derive a set of conditions that characterize when
such models exhibit oscillatory behaviour. In the first case, we consider a
spatially flat FLRW model with only a minimally-coupled scalar field, described
by a nonnega... | [
{
"created": "Tue, 16 May 2017 17:20:35 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2017 22:26:09 GMT",
"version": "v2"
}
] | 2017-06-12 | [
[
"Kohli",
"Ikjyot Singh",
""
]
] | In this paper, we consider spatially flat FLRW cosmological models in two contexts in an attempt to derive a set of conditions that characterize when such models exhibit oscillatory behaviour. In the first case, we consider a spatially flat FLRW model with only a minimally-coupled scalar field, described by a nonnegati... |
2106.11293 | Alan Kostelecky | Alan Kostelecky, Zonghao Li | Searches for beyond-Riemann gravity | 24 pages two-column REVTeX, version accepted in Physical Review D | Phys. Rev. D 104, 044054 (2021) | 10.1103/PhysRevD.104.044054 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many effective field theories describing gravity cannot arise from an
underlying theory based on Riemann geometry or its extensions to include
torsion and nonmetricity but may instead emerge from another geometry or may
have a nongeometric basis. The Lagrange density for a broad class of such
theories is investigated... | [
{
"created": "Mon, 21 Jun 2021 17:51:02 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jul 2021 12:38:08 GMT",
"version": "v2"
}
] | 2021-08-25 | [
[
"Kostelecky",
"Alan",
""
],
[
"Li",
"Zonghao",
""
]
] | Many effective field theories describing gravity cannot arise from an underlying theory based on Riemann geometry or its extensions to include torsion and nonmetricity but may instead emerge from another geometry or may have a nongeometric basis. The Lagrange density for a broad class of such theories is investigated. ... |
1406.7653 | Emilio Elizalde | E. Elizalde, V.V. Obukhov, A.V. Timoshkin | Inhomogeneous viscous dark fluid coupled with dark matter in the FRW
universe | 11 pages, 2 figures, to appear in MPLA | null | 10.1142/S0217732314501326 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological model with an inhomogeneous viscous dark fluid coupled with
dark matter in a flat Friedman-Robertson-Walker universe is investigated. The
influence of dark matter on the behavior of an inhomogeneous viscous fluid of
this kind, responsible for cosmic acceleration and for the appearance of
different type... | [
{
"created": "Mon, 30 Jun 2014 10:14:13 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Elizalde",
"E.",
""
],
[
"Obukhov",
"V. V.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] | A cosmological model with an inhomogeneous viscous dark fluid coupled with dark matter in a flat Friedman-Robertson-Walker universe is investigated. The influence of dark matter on the behavior of an inhomogeneous viscous fluid of this kind, responsible for cosmic acceleration and for the appearance of different types ... |
2403.07044 | Ali \"Ovg\"un Dr. | Erdem Sucu and Ali \"Ovg\"un | The Effect of Quark-antiquark Confinement on the Deflection Angle by the
NED Black Hole | 13 pages. Two-column. Accepted for publication in Physics of the Dark
Universe | Phys.Dark Univ. 44 (2024) 101446 | 10.1016/j.dark.2024.101446 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this study, we explore the influence of quark-antiquark confinement on the
deflection angle within the framework of nonlinear electrodynamic (NED) black
holes. To achieve this, we establish the appropriate optical spacetime metric
and subsequently determine the Gaussian optical curvature. Utilizing the
Gauss-Bonne... | [
{
"created": "Mon, 11 Mar 2024 17:48:48 GMT",
"version": "v1"
}
] | 2024-03-13 | [
[
"Sucu",
"Erdem",
""
],
[
"Övgün",
"Ali",
""
]
] | In this study, we explore the influence of quark-antiquark confinement on the deflection angle within the framework of nonlinear electrodynamic (NED) black holes. To achieve this, we establish the appropriate optical spacetime metric and subsequently determine the Gaussian optical curvature. Utilizing the Gauss-Bonnet ... |
2307.00565 | Hao Xu | Hao Xu, Yun Du | Gauss-Bonnet modification to Hawking evaporation of AdS black holes in
massive gravity | 16 pages;v2: numerical example added in Figure 5, accepted by EPJP | Eur.Phys.J.Plus 139 (2024) 1, 77 | 10.1140/epjp/s13360-023-04853-x | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The Stefan-Boltzmann law can estimate particle emission power and lifetime of
a black hole. However, in modified gravity theories, new parameters in the
action can cause qualitative changes in thermodynamic quantities, thus
obtaining specific thermodynamic properties often requires complicated
calculation with higher... | [
{
"created": "Sun, 2 Jul 2023 13:20:24 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Dec 2023 05:58:04 GMT",
"version": "v2"
}
] | 2024-01-31 | [
[
"Xu",
"Hao",
""
],
[
"Du",
"Yun",
""
]
] | The Stefan-Boltzmann law can estimate particle emission power and lifetime of a black hole. However, in modified gravity theories, new parameters in the action can cause qualitative changes in thermodynamic quantities, thus obtaining specific thermodynamic properties often requires complicated calculation with higher d... |
gr-qc/9610009 | Torsten Asselmeyer | T. Asselmeyer | Generation of Source Terms in General Relativity by differential
structures | 14 pages, LaTeX, submitted to Class. Quant. Grav | Class.Quant.Grav. 14 (1997) 749-758 | 10.1088/0264-9381/14/3/016 | null | gr-qc dg-ga hep-th math.DG | null | In this paper the relation between the choice of a differential structure and
a smooth connection in the tangential bundle is discussed. For the case of an
exotic $S^7$ one obtains corrections to the curvature after the change of the
differential structure, which can not be neglected by a gauge transformation.
In the... | [
{
"created": "Wed, 9 Oct 1996 10:45:02 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Asselmeyer",
"T.",
""
]
] | In this paper the relation between the choice of a differential structure and a smooth connection in the tangential bundle is discussed. For the case of an exotic $S^7$ one obtains corrections to the curvature after the change of the differential structure, which can not be neglected by a gauge transformation. In the m... |
gr-qc/9609022 | Jorge Pullin | Reinaldo Gleiser, Oscar Nicasio, Richard Price, Jorge Pullin | Colliding black holes: how far can the close approximation go? | 6 pages, RevTeX, 2 figures included with epsf | Phys.Rev.Lett. 77 (1996) 4483-4486 | 10.1103/PhysRevLett.77.4483 | CGQG-96/9-1 | gr-qc astro-ph | null | We study the head-on collision of two equal-mass momentarily stationary black
holes, using black hole perturbation theory up to second order. Compared to
first-order results, this significantly improves agreement with numerically
computed waveforms and energy. Much more important, second-order results
correctly indic... | [
{
"created": "Mon, 9 Sep 1996 13:09:14 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Gleiser",
"Reinaldo",
""
],
[
"Nicasio",
"Oscar",
""
],
[
"Price",
"Richard",
""
],
[
"Pullin",
"Jorge",
""
]
] | We study the head-on collision of two equal-mass momentarily stationary black holes, using black hole perturbation theory up to second order. Compared to first-order results, this significantly improves agreement with numerically computed waveforms and energy. Much more important, second-order results correctly indicat... |
gr-qc/0005102 | Emil Mottola | Paul R. Anderson, Wayne Eaker, Salman Habib, Carmen Molina-Paris, Emil
Mottola | Attractor states and infrared scaling in de Sitter space | 30 pages, 6 figures, 46 kB tar.gz file | Phys.Rev. D62 (2000) 124019 | 10.1103/PhysRevD.62.124019 | LA-UR-00-52 | gr-qc | null | The renormalized expectation value of the energy-momentum tensor for a scalar
field with any mass m and curvature coupling xi is studied for an arbitrary
homogeneous and isotropic physical initial state in de Sitter spacetime. We
prove quite generally that <T_{ab}> has a fixed point attractor behavior at
late times, ... | [
{
"created": "Tue, 23 May 2000 19:34:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Anderson",
"Paul R.",
""
],
[
"Eaker",
"Wayne",
""
],
[
"Habib",
"Salman",
""
],
[
"Molina-Paris",
"Carmen",
""
],
[
"Mottola",
"Emil",
""
]
] | The renormalized expectation value of the energy-momentum tensor for a scalar field with any mass m and curvature coupling xi is studied for an arbitrary homogeneous and isotropic physical initial state in de Sitter spacetime. We prove quite generally that <T_{ab}> has a fixed point attractor behavior at late times, wh... |
2308.02114 | Jun-Xian Li | Jun-Xian Li, Jing-Yi Zhang | Corrections to the thermodynamic quantities of Bose system by the
generalized uncertainty principle | null | EPL 139 69003 (2022) | 10.1209/0295-5075/ac8f6a | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigated the Bose system in a spherical shell close to the
black hole horizon. Several thermodynamic quantities of the Bose system are
derived, which are different from those in the flat spacetime, by introducing
the generalized uncertainty principle (GUP) into the grand partition function
of statistic... | [
{
"created": "Fri, 4 Aug 2023 02:35:05 GMT",
"version": "v1"
}
] | 2023-08-07 | [
[
"Li",
"Jun-Xian",
""
],
[
"Zhang",
"Jing-Yi",
""
]
] | This paper investigated the Bose system in a spherical shell close to the black hole horizon. Several thermodynamic quantities of the Bose system are derived, which are different from those in the flat spacetime, by introducing the generalized uncertainty principle (GUP) into the grand partition function of statistical... |
2211.11538 | Icaro Daniel Dias De Carvalho | I. D.D. Carvalho, G. Alencar and C. R. Muniz | Thermodynamics of static and stationary black holes in
Einstein-Gauss-Bonnet gravity with dark matter | We add the rotation black hole case. The new version has 22 pages and
11 figures | null | 10.1016/j.dark.2023.101290 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies Einstein-Gauss-Bonnet (EGB) black holes surrounded by
three phenomenological distributions of dark matter halos. The main result is
obtaining the analytical solutions for the metric and all thermodynamic
quantities, such as Hawking temperature, entropy, constant-volume heat
capacity, and Gibbs free... | [
{
"created": "Mon, 21 Nov 2022 15:04:38 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2022 16:06:04 GMT",
"version": "v2"
}
] | 2023-09-15 | [
[
"Carvalho",
"I. D. D.",
""
],
[
"Alencar",
"G.",
""
],
[
"Muniz",
"C. R.",
""
]
] | This paper studies Einstein-Gauss-Bonnet (EGB) black holes surrounded by three phenomenological distributions of dark matter halos. The main result is obtaining the analytical solutions for the metric and all thermodynamic quantities, such as Hawking temperature, entropy, constant-volume heat capacity, and Gibbs free e... |
gr-qc/9312034 | null | B. L. Hu and Yuhong Zhang | Uncertainty Relation for a Quantum Open System | 36 pages,Tex,umdpp93-162,(submitted to Phys. Rev. A) | Int.J.Mod.Phys. A10 (1995) 4537-4562 | 10.1142/S0217751X95002102 | null | gr-qc hep-th | null | We derive the uncertainty relation for a quantum open system comprised of a
Brownian particle interacting with a bath of quantum oscillators at finite
temperature. We examine how the quantum and thermal fluctuations of the
environment contribute to the uncertainty in the canonical variables of the
system. We show tha... | [
{
"created": "Thu, 23 Dec 1993 16:33:40 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Hu",
"B. L.",
""
],
[
"Zhang",
"Yuhong",
""
]
] | We derive the uncertainty relation for a quantum open system comprised of a Brownian particle interacting with a bath of quantum oscillators at finite temperature. We examine how the quantum and thermal fluctuations of the environment contribute to the uncertainty in the canonical variables of the system. We show that ... |
gr-qc/0407001 | Badri Krishnan | Badri Krishnan, Alicia M. Sintes, M.A. Papa, Bernard F. Schutz, Sergio
Frasca, Cristiano Palomba | The Hough transform search for continuous gravitational waves | 22 pages, RevTeX4, typos and references corrected. Final PRD version | Phys.Rev. D70 (2004) 082001 | 10.1103/PhysRevD.70.082001 | null | gr-qc | null | This paper describes an incoherent method to search for continuous
gravitational waves based on the Hough transform, a well known technique used
for detecting patterns in digital images. We apply the Hough transform to
detect patterns in the time-frequency plane of the data produced by an
earth-based gravitational wa... | [
{
"created": "Thu, 1 Jul 2004 08:25:28 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Oct 2004 13:04:26 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Krishnan",
"Badri",
""
],
[
"Sintes",
"Alicia M.",
""
],
[
"Papa",
"M. A.",
""
],
[
"Schutz",
"Bernard F.",
""
],
[
"Frasca",
"Sergio",
""
],
[
"Palomba",
"Cristiano",
""
]
] | This paper describes an incoherent method to search for continuous gravitational waves based on the Hough transform, a well known technique used for detecting patterns in digital images. We apply the Hough transform to detect patterns in the time-frequency plane of the data produced by an earth-based gravitational wave... |
2207.14576 | Fabrizio Esposito | Fabrizio Esposito, Sante Carloni and Stefano Vignolo | Bianchi type-I cosmological dynamics in $f(\mathcal{Q})$ gravity: a
covariant approach | 27 pages, 11 figures | Class. Quantum Grav. 39, 235014 (2022) | 10.1088/1361-6382/ac9efd | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Making use of the $1 + 3$ covariant formalism, we show explicitly the effect
that nonmetricity has on the dynamics of the universe. Then, using the
Dynamical System Approach, we analyze the evolution of Bianchi type-I
cosmologies within the framework of $f(\mathcal{Q})$ gravity. We consider
several models of function... | [
{
"created": "Fri, 29 Jul 2022 09:45:27 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2022 15:45:00 GMT",
"version": "v2"
}
] | 2022-11-16 | [
[
"Esposito",
"Fabrizio",
""
],
[
"Carloni",
"Sante",
""
],
[
"Vignolo",
"Stefano",
""
]
] | Making use of the $1 + 3$ covariant formalism, we show explicitly the effect that nonmetricity has on the dynamics of the universe. Then, using the Dynamical System Approach, we analyze the evolution of Bianchi type-I cosmologies within the framework of $f(\mathcal{Q})$ gravity. We consider several models of function $... |
gr-qc/0611115 | Gerhard Rein | Hakan Andreasson, Markus Kunze, Gerhard Rein | Global existence for the spherically symmetric Einstein-Vlasov system
with outgoing matter | 16 pages | Commun.Part.Diff.Eq.33:656-668,2008 | 10.1080/03605300701454883 | null | gr-qc | null | We prove a new global existence result for the asymptotically flat,
spherically symmetric Einstein-Vlasov system which describes in the framework
of general relativity an ensemble of particles which interact by gravity. The
data are such that initially all the particles are moving radially outward and
that this prope... | [
{
"created": "Wed, 22 Nov 2006 15:11:43 GMT",
"version": "v1"
}
] | 2011-02-01 | [
[
"Andreasson",
"Hakan",
""
],
[
"Kunze",
"Markus",
""
],
[
"Rein",
"Gerhard",
""
]
] | We prove a new global existence result for the asymptotically flat, spherically symmetric Einstein-Vlasov system which describes in the framework of general relativity an ensemble of particles which interact by gravity. The data are such that initially all the particles are moving radially outward and that this propert... |
1911.03893 | David McNutt | A. A. Coley, R. J. van den Hoogen and D. D. McNutt | Symmetry and Equivalence in Teleparallel Gravity | 52 pages. Equations have been corrected and a new subsection has been
included on the covariant form of the f(T) field equations | J. Math. Phys. 61, 072503 (2020) | 10.1063/5.0003252 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In theories such as teleparallel gravity and its extensions, the frame basis
replaces the metric tensor as the primary object of study. A choice of
coordinate system, frame basis and spin-connection must be made to obtain a
solution from the field equations of a given teleparallel gravity theory. It is
worthwhile to ... | [
{
"created": "Sun, 10 Nov 2019 10:43:15 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Jan 2020 16:36:31 GMT",
"version": "v2"
}
] | 2024-02-28 | [
[
"Coley",
"A. A.",
""
],
[
"Hoogen",
"R. J. van den",
""
],
[
"McNutt",
"D. D.",
""
]
] | In theories such as teleparallel gravity and its extensions, the frame basis replaces the metric tensor as the primary object of study. A choice of coordinate system, frame basis and spin-connection must be made to obtain a solution from the field equations of a given teleparallel gravity theory. It is worthwhile to ex... |
gr-qc/9905066 | Arbab I. Arbab | Arbab I. Arbab | Cosmic Acceleration With A Positive Cosmological Constant | a more revised version | Class.Quant.Grav. 20 (2003) 93-100 | 10.1088/0264-9381/20/1/307 | null | gr-qc astro-ph | null | We have considered a cosmological model with a phenomenological model for the
cosmological constant of the form $\Lambda=\bt\fr{\ddot R}{R}$, $ \bt$ is a
constant. For age parameter consistent with observational data the Universe
must be accelerating in the presence of a positive cosmological constant. The
minimum ag... | [
{
"created": "Wed, 19 May 1999 17:14:20 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 1999 12:30:55 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Oct 1999 09:48:21 GMT",
"version": "v3"
},
{
"created": "Mon, 14 May 2001 19:49:48 GMT",
"version": "v4"
},
{
"c... | 2017-08-23 | [
[
"Arbab",
"Arbab I.",
""
]
] | We have considered a cosmological model with a phenomenological model for the cosmological constant of the form $\Lambda=\bt\fr{\ddot R}{R}$, $ \bt$ is a constant. For age parameter consistent with observational data the Universe must be accelerating in the presence of a positive cosmological constant. The minimum age ... |
1601.04315 | Simon Garruto | Lorenzo Fatibene and Simon Garruto | Extended Theories of Gravitation | Workshop Variational principles and conservation laws in General
Relativity, Torino, June 24-25, 2015in memory of Mauro Francaviglia | null | 10.1142/S0219887816500705 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we shall review the equivalence between Palatini$-f(\mathcal
R)$ theories and Brans- Dicke (BD) theories at the level of action principles.
We shall define the Helmholtz Lagrangian associated to Palatini$-f(\mathcal R)$
theory and we will define some transformations which will be useful to recover
Einst... | [
{
"created": "Sun, 17 Jan 2016 17:31:19 GMT",
"version": "v1"
}
] | 2016-03-28 | [
[
"Fatibene",
"Lorenzo",
""
],
[
"Garruto",
"Simon",
""
]
] | In this paper we shall review the equivalence between Palatini$-f(\mathcal R)$ theories and Brans- Dicke (BD) theories at the level of action principles. We shall define the Helmholtz Lagrangian associated to Palatini$-f(\mathcal R)$ theory and we will define some transformations which will be useful to recover Einstei... |
gr-qc/9302020 | Ted Jacobson | R. Capovilla, J. Dell and T. Jacobson | The Initial Value Problem in Light of Ashtekar's Variables | 15 pages, UMDGR93-140, NSF-ITP-93-20 | null | null | null | gr-qc | null | The form of the initial value constraints in Ashtekar's hamiltonian
formulation of general relativity is recalled, and the problem of solving them
is compared with that in the traditional metric variables. It is shown how the
general solution of the four diffeomorphism constraints can be obtained
algebraically provid... | [
{
"created": "Thu, 18 Feb 1993 22:02:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Capovilla",
"R.",
""
],
[
"Dell",
"J.",
""
],
[
"Jacobson",
"T.",
""
]
] | The form of the initial value constraints in Ashtekar's hamiltonian formulation of general relativity is recalled, and the problem of solving them is compared with that in the traditional metric variables. It is shown how the general solution of the four diffeomorphism constraints can be obtained algebraically provided... |
2103.12473 | Roberta Chiovoloni | Giovanni Montani and Roberta Chiovoloni | A Scenario for a Singularity-free Generic Cosmological Solution | 7 pages, 1 figure | Phys. Rev. D 103, 123516 (2021) | 10.1103/PhysRevD.103.123516 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We develop a scenario for the emergence of a non-singular generic
cosmological solution based on the a WKB characterization of one of the two
anisotropy degrees of freedom. We investigate the dynamics of the so-called
inhomogeneous mixmaster in the "corner" configuration and inferring that one of
the two anisotropic ... | [
{
"created": "Tue, 23 Mar 2021 11:55:18 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Apr 2021 11:51:40 GMT",
"version": "v2"
}
] | 2021-06-16 | [
[
"Montani",
"Giovanni",
""
],
[
"Chiovoloni",
"Roberta",
""
]
] | We develop a scenario for the emergence of a non-singular generic cosmological solution based on the a WKB characterization of one of the two anisotropy degrees of freedom. We investigate the dynamics of the so-called inhomogeneous mixmaster in the "corner" configuration and inferring that one of the two anisotropic va... |
gr-qc/9504022 | Andrei Linde | Juan Garcia-Bellido and Andrei Linde | STATIONARY SOLUTIONS IN BRANS-DICKE STOCHASTIC INFLATIONARY COSMOLOGY | 19 pages, LaTeX | Phys.Rev.D52:6730-6738,1995 | 10.1103/PhysRevD.52.6730 | SU-ITP-95-8, IEM-FT-86/95, SUSSEX-AST-95/4-2 | gr-qc astro-ph hep-ph hep-th | null | In Brans-Dicke theory the Universe becomes divided after inflation into many
exponentially large domains with different values of the effective
gravitational constant. Such a process can be described by diffusion equations
for the probability of finding a certain value of the inflaton and dilaton
fields in a physical... | [
{
"created": "Sat, 15 Apr 1995 19:24:06 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Garcia-Bellido",
"Juan",
""
],
[
"Linde",
"Andrei",
""
]
] | In Brans-Dicke theory the Universe becomes divided after inflation into many exponentially large domains with different values of the effective gravitational constant. Such a process can be described by diffusion equations for the probability of finding a certain value of the inflaton and dilaton fields in a physical v... |
1503.01152 | Alaric Doria | Alaric Doria, Gerardo Munoz | Acceleration without Temperature | 4 pages | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that while some non-uniformly accelerating observers (NUAOs) do
indeed see a Bose-Einstein distribution of particles for the expectation value
of the number operator in the Minkowski vacuum state, the density matrix is
non-thermal and therefore a definition of temperature is not warranted. This is
due to the ... | [
{
"created": "Tue, 3 Mar 2015 22:41:55 GMT",
"version": "v1"
}
] | 2015-03-05 | [
[
"Doria",
"Alaric",
""
],
[
"Munoz",
"Gerardo",
""
]
] | We show that while some non-uniformly accelerating observers (NUAOs) do indeed see a Bose-Einstein distribution of particles for the expectation value of the number operator in the Minkowski vacuum state, the density matrix is non-thermal and therefore a definition of temperature is not warranted. This is due to the fa... |
2011.13848 | Refik Mansuroglu | Refik Mansuroglu and Hanno Sahlmann | Kinematics of arbitrary spin matter fields in loop quantum gravity | 21 pages v2: Minor changes and rearrangements of the text, removed
various typos. Version essentially identical to the one published in PRD | Phys. Rev. D 103, 106010 (2021) | 10.1103/PhysRevD.103.106010 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Loop quantum gravity envisions a small scale structure of spacetime that is
markedly different from that of the classical spacetime continuum. This has
ramifications for the excitation of matter fields and for their coupling to
gravity. There is a general understanding of how to formulate scalar fields,
spin $\frac{1... | [
{
"created": "Fri, 27 Nov 2020 17:27:50 GMT",
"version": "v1"
},
{
"created": "Mon, 10 May 2021 21:29:14 GMT",
"version": "v2"
}
] | 2021-05-19 | [
[
"Mansuroglu",
"Refik",
""
],
[
"Sahlmann",
"Hanno",
""
]
] | Loop quantum gravity envisions a small scale structure of spacetime that is markedly different from that of the classical spacetime continuum. This has ramifications for the excitation of matter fields and for their coupling to gravity. There is a general understanding of how to formulate scalar fields, spin $\frac{1}{... |
gr-qc/9502021 | Animals have rights | Mauro Carfora and Kamilla Piotrkowska | A Renormalization Group Approach to Relativistic Cosmology | 57 pages, LaTeX, 15 pictures available on request from the Authors | Phys.Rev. D52 (1995) 4393-4424 | 10.1103/PhysRevD.52.4393 | SISSA Ref. 8/95/FM | gr-qc | null | We discuss the averaging hypothesis tacitly assumed in standard cosmology.
Our approach is implemented in a "3+1" formalism and invokes the coarse
graining arguments, provided and supported by the real-space Renormalization
Group (RG) methods. Block variables are introduced and the recursion relations
written down ex... | [
{
"created": "Wed, 8 Feb 1995 21:40:59 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Carfora",
"Mauro",
""
],
[
"Piotrkowska",
"Kamilla",
""
]
] | We discuss the averaging hypothesis tacitly assumed in standard cosmology. Our approach is implemented in a "3+1" formalism and invokes the coarse graining arguments, provided and supported by the real-space Renormalization Group (RG) methods. Block variables are introduced and the recursion relations written down expl... |
1711.04102 | Zhu Yi | Yungui Gong, Eleftherios Papantonopoulos, Zhu Yi | Constraints on scalar-tensor theory of gravity by the recent
observational results on gravitational waves | 7 pages, 1 figure, typo corrected, references added and updated, Eur.
Phys. J. C in press | Eur. Phys. J. C (2018) 78: 738 | 10.1140/epjc/s10052-018-6227-9 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The speed of gravitational waves provides us a new tool to test alternative
theories of gravity. The constraint on the speed of gravitational waves from
GW170817 and GRB170817A is used to test some classes of Horndeski theory. In
particular, we consider the coupling of a scalar field to Einstein tensor and
the coupli... | [
{
"created": "Sat, 11 Nov 2017 08:44:21 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Sep 2018 04:40:12 GMT",
"version": "v2"
}
] | 2018-09-19 | [
[
"Gong",
"Yungui",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Yi",
"Zhu",
""
]
] | The speed of gravitational waves provides us a new tool to test alternative theories of gravity. The constraint on the speed of gravitational waves from GW170817 and GRB170817A is used to test some classes of Horndeski theory. In particular, we consider the coupling of a scalar field to Einstein tensor and the coupling... |
2005.11324 | Bruno Le Floch | Bruno Le Floch, Philippe G. LeFloch, Gabriele Veneziano | Cyclic spacetimes through singularity scattering maps. The laws of
quiescent bounces | 54 pages. v2: Construction of plane-symmetric cyclic spacetimes moved
to arXiv:2106.09666. v3: Version published in JHEP | JHEP 2022, 95 (2022) | 10.1007/JHEP04(2022)095 | CERN-TH-2020-100 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For spacetimes containing quiescent singularity hypersurfaces we propose a
general notion of junction conditions based on a prescribed singularity
scattering map, as we call it, and we introduce the notion of a cyclic
spacetime (also called a multiverse) consisting of spacetime domains bounded by
spacelike or timelik... | [
{
"created": "Fri, 22 May 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jun 2021 17:09:51 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Apr 2022 09:03:45 GMT",
"version": "v3"
}
] | 2024-04-09 | [
[
"Floch",
"Bruno Le",
""
],
[
"LeFloch",
"Philippe G.",
""
],
[
"Veneziano",
"Gabriele",
""
]
] | For spacetimes containing quiescent singularity hypersurfaces we propose a general notion of junction conditions based on a prescribed singularity scattering map, as we call it, and we introduce the notion of a cyclic spacetime (also called a multiverse) consisting of spacetime domains bounded by spacelike or timelike ... |
0802.0936 | M. Alessandra Papa | M. Alessandra Papa | Progress towards Gravitational Wave Astronomy | Based on a talk presented at the joint "18th International Conference
on General Relativity and Gravitation" and "7th Amaldi Conference on
Gravitational Waves", 8-13 July 2007, Sydney, Australia | Class.Quant.Grav.25:114009,2008 | 10.1088/0264-9381/25/11/114009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I will review the most recent and interesting results from gravitational wave
detection experiments, concentrating on recent results from the LIGO Scientific
Collaboration (LSC). I will outline the methodologies utilized in the searches,
explain what can be said in the case of a null result, what quantities may be
co... | [
{
"created": "Thu, 7 Feb 2008 09:57:59 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Mar 2008 13:22:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Papa",
"M. Alessandra",
""
]
] | I will review the most recent and interesting results from gravitational wave detection experiments, concentrating on recent results from the LIGO Scientific Collaboration (LSC). I will outline the methodologies utilized in the searches, explain what can be said in the case of a null result, what quantities may be cons... |
2212.04605 | Hongguang Liu | Muxin Han and Hongguang Liu | Covariant ${\bar{\mu}}$-scheme effective dynamics, mimetic gravity, and
non-singular black holes: Applications to spherical symmetric quantum gravity
and CGHS model | 49 pages, 23 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new $\bar{\mu}$-scheme Hamiltonian effective dynamics in the
spherical symmetric sector of Loop Quantum Gravity (LQG). The effective
dynamics is generally covariant as derived from a covariant Lagrangian. The
Lagrangian belongs to the class of extended mimetic gravity Lagrangians in 4
dimensions. We appl... | [
{
"created": "Thu, 8 Dec 2022 23:41:01 GMT",
"version": "v1"
}
] | 2022-12-12 | [
[
"Han",
"Muxin",
""
],
[
"Liu",
"Hongguang",
""
]
] | We propose a new $\bar{\mu}$-scheme Hamiltonian effective dynamics in the spherical symmetric sector of Loop Quantum Gravity (LQG). The effective dynamics is generally covariant as derived from a covariant Lagrangian. The Lagrangian belongs to the class of extended mimetic gravity Lagrangians in 4 dimensions. We apply ... |
1103.3538 | Francesco Nicol\`o FN | Giulio Caciotta, Francesco Nicol\`o | Local and Global Analytic Solutions for a Class of Characteristic
Problems of the Einstein Vacuum Equations in the "Double Null Foliation
Gauge" | 68 pages | null | 10.1007/s00023-011-0151-y | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main goal of this work consists in showing that the analytic solutions
for a class of characteristic problems for the Einstein vacuum equations have
an existence region larger than the one provided by the Cauchy-Kowalevski
theorem due to the intrinsic hyperbolicity of the Einstein equations. To prove
this result ... | [
{
"created": "Thu, 17 Mar 2011 23:47:20 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Caciotta",
"Giulio",
""
],
[
"Nicolò",
"Francesco",
""
]
] | The main goal of this work consists in showing that the analytic solutions for a class of characteristic problems for the Einstein vacuum equations have an existence region larger than the one provided by the Cauchy-Kowalevski theorem due to the intrinsic hyperbolicity of the Einstein equations. To prove this result we... |
2208.01766 | Hector Iglesias | H. L. Iglesias, J. Lange, I. Bartos, S. Bhaumik, R. Gamba, V.
Gayathri, A. Jan, R. Nowicki, R. O'Shaughnessy, D. Shoemaker, R.
Venkataramanan, and K. Wagner | Eccentricity estimation for five binary black hole mergers with
higher-order gravitational wave modes | We have updated our results after performing reruns of our eccentric
and quasi-circular analyses, and we have also included spin-precessing
analyses of all the events selected in this paper | null | null | LIGO-P2200208 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The detection of orbital eccentricity for a binary black hole system via
gravitational waves is a key signature to distinguish between the possible
binary origins. The identification of eccentricity has been difficult so far
due to the limited availability of eccentric gravitational waveforms over the
full range of b... | [
{
"created": "Tue, 2 Aug 2022 21:45:28 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Sep 2023 22:40:02 GMT",
"version": "v2"
}
] | 2023-09-19 | [
[
"Iglesias",
"H. L.",
""
],
[
"Lange",
"J.",
""
],
[
"Bartos",
"I.",
""
],
[
"Bhaumik",
"S.",
""
],
[
"Gamba",
"R.",
""
],
[
"Gayathri",
"V.",
""
],
[
"Jan",
"A.",
""
],
[
"Nowicki",
"R.",
""... | The detection of orbital eccentricity for a binary black hole system via gravitational waves is a key signature to distinguish between the possible binary origins. The identification of eccentricity has been difficult so far due to the limited availability of eccentric gravitational waveforms over the full range of bla... |
2307.02338 | Jia-Hui Huang | Kai-Peng Lu, Wenbin Li and Jia-Hui Huang | Quasinormal modes and stability of higher dimensional rotating black
holes under massive scalar perturbations | 11 pages,9 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider the stability of six-dimensional singly rotating Myers-Perry
black holes under massive scalar perturbations. Using Leaver's continued
fraction method, we compute the quasinormal modes of the massive scalar fields.
All modes found are damped under the quasinormal boundary conditions. It is
also found that ... | [
{
"created": "Wed, 5 Jul 2023 14:48:24 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2023 00:19:00 GMT",
"version": "v2"
}
] | 2023-07-11 | [
[
"Lu",
"Kai-Peng",
""
],
[
"Li",
"Wenbin",
""
],
[
"Huang",
"Jia-Hui",
""
]
] | We consider the stability of six-dimensional singly rotating Myers-Perry black holes under massive scalar perturbations. Using Leaver's continued fraction method, we compute the quasinormal modes of the massive scalar fields. All modes found are damped under the quasinormal boundary conditions. It is also found that lo... |
0801.1554 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | Einstein-Yang-Mills black hole solution in higher dimensions by the
Wu-Yang Ansatz | 10 pages, 5 figures | Phys.Lett.B659:471,2008 | 10.1016/j.physletb.2007.11.006 | null | gr-qc | null | By employing the higher dimensional version of the Wu-Yang Ansatz we obtain
black hole solutions in the spherically symmetric Einstein-Yang-Mills (EYM)
theory. Although these solutions were found recently by other means, our method
provides an alternative way in which one identifies the contribution from the
Yang-Mil... | [
{
"created": "Thu, 10 Jan 2008 08:05:44 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jan 2008 14:12:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | By employing the higher dimensional version of the Wu-Yang Ansatz we obtain black hole solutions in the spherically symmetric Einstein-Yang-Mills (EYM) theory. Although these solutions were found recently by other means, our method provides an alternative way in which one identifies the contribution from the Yang-Mills... |
1708.00987 | Aharon Davidson | Aharon Davidson | Hydrogen-like Spectrum of Spontaneously Created Brane Universes with
deSitter Ground State | 5 PRL style pages, 4 figures | Phys. Lett. B780, 29 (2018) | 10.1016/j.physletb.2018.01.044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unification of Randall-Sundrum and Regge-Teitelboim brane cosmologies gives
birth to a serendipitous Higgs-deSitter interplay. A localized
Dvali-Gabadadze-Porrati scalar field, governed by a particular (analytically
derived) double-well quartic potential, becomes a mandatory ingredient for
supporting a deSitter brane... | [
{
"created": "Thu, 3 Aug 2017 03:40:48 GMT",
"version": "v1"
}
] | 2018-03-05 | [
[
"Davidson",
"Aharon",
""
]
] | Unification of Randall-Sundrum and Regge-Teitelboim brane cosmologies gives birth to a serendipitous Higgs-deSitter interplay. A localized Dvali-Gabadadze-Porrati scalar field, governed by a particular (analytically derived) double-well quartic potential, becomes a mandatory ingredient for supporting a deSitter brane u... |
2012.10248 | Alessio Marrani | Piero Truini, Alessio Marrani, Michael Rios, Klee Irwin | Space, Matter and Interactions in a Quantum Early Universe. Part II :
Superalgebras and Vertex Algebras | 1+14 pages, 5 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our investigation on quantum gravity, we introduce an infinite dimensional
complex Lie algebra $\textbf{${\mathfrak g}_{\mathsf u}$}$ that extends
$\mathbf{e_9}$. It is defined through a symmetric Cartan matrix of a rank 12
Borcherds algebra. We turn $\textbf{${\mathfrak g}_{\mathsf u}$}$ into a Lie
superalgebra $... | [
{
"created": "Fri, 18 Dec 2020 14:01:11 GMT",
"version": "v1"
}
] | 2020-12-21 | [
[
"Truini",
"Piero",
""
],
[
"Marrani",
"Alessio",
""
],
[
"Rios",
"Michael",
""
],
[
"Irwin",
"Klee",
""
]
] | In our investigation on quantum gravity, we introduce an infinite dimensional complex Lie algebra $\textbf{${\mathfrak g}_{\mathsf u}$}$ that extends $\mathbf{e_9}$. It is defined through a symmetric Cartan matrix of a rank 12 Borcherds algebra. We turn $\textbf{${\mathfrak g}_{\mathsf u}$}$ into a Lie superalgebra $\t... |
1912.10826 | Jie Jiang | Jie Jiang | Static charged Gauss-Bonnet black holes cannot be overcharged by the new
version of gedanken experiments | 6 pages. This paper has been published in PLB | null | 10.1016/j.physletb.2020.135365 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the new version of the gedanken experiments proposed by Sorce and
Wald, we examine the weak cosmic censorship conjecture (WCCC) under the
spherically charged infalling matter collision process in the static charged
Gauss-Bonnet black holes. After considering the null energy condition and
assuming the stabili... | [
{
"created": "Tue, 17 Dec 2019 23:48:37 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Mar 2020 01:44:53 GMT",
"version": "v2"
}
] | 2020-03-17 | [
[
"Jiang",
"Jie",
""
]
] | Based on the new version of the gedanken experiments proposed by Sorce and Wald, we examine the weak cosmic censorship conjecture (WCCC) under the spherically charged infalling matter collision process in the static charged Gauss-Bonnet black holes. After considering the null energy condition and assuming the stability... |
2401.17589 | Zheng-Wen Long | Meng-Yao Zhang, Hao Chen, Hassan Hassanabadi, Zheng-Wen Long, and Hui
Yang | Critical behavior and Joule-Thomson expansion of charged AdS black holes
surrounded by exotic fluid with modified Chaplygin equation of state | 11 pages,8 figures | Chinese Physics C (2024) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By considering the concept of a unified single fluid model, referred to as
the modified Chaplygin gas (MCG), which amalgamates dark energy and dark
matter. In this study, we explore the thermodynamic characteristics of charged
anti-de Sitter (AdS) black holes existing in an unconventional fluid
accompanied by MCG. To... | [
{
"created": "Wed, 31 Jan 2024 04:27:20 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2024 03:03:51 GMT",
"version": "v2"
}
] | 2024-03-13 | [
[
"Zhang",
"Meng-Yao",
""
],
[
"Chen",
"Hao",
""
],
[
"Hassanabadi",
"Hassan",
""
],
[
"Long",
"Zheng-Wen",
""
],
[
"Yang",
"Hui",
""
]
] | By considering the concept of a unified single fluid model, referred to as the modified Chaplygin gas (MCG), which amalgamates dark energy and dark matter. In this study, we explore the thermodynamic characteristics of charged anti-de Sitter (AdS) black holes existing in an unconventional fluid accompanied by MCG. To a... |
0809.2328 | Yurij Baryshev | Yu. V. Baryshev (Astron.Inst.St.-Petersburg Univ.) | New Possibilities for Observational Distinction Between Geometrical and
Field Gravity Theories | 13 pages, Proceedings of the International conference "Problems of
Practical Cosmology", 23-27 June 2008, St.-Petersburg, Russia, see
http://ppc08.astro.spbu.ru/text_proc.html | PracticalCosmology.1:276-286,2008 | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Crucial observational tests of gravity physics are reviewed. Such tests are
able to clarify the key question on the nature of gravitational interaction: is
gravity the curvature of space? or is gravity a matter field in Minkowski flat
space as other physical forces? Up to now all actually performed experiments do
not... | [
{
"created": "Sat, 13 Sep 2008 09:47:47 GMT",
"version": "v1"
}
] | 2008-11-07 | [
[
"Baryshev",
"Yu. V.",
"",
"Astron.Inst.St.-Petersburg Univ."
]
] | Crucial observational tests of gravity physics are reviewed. Such tests are able to clarify the key question on the nature of gravitational interaction: is gravity the curvature of space? or is gravity a matter field in Minkowski flat space as other physical forces? Up to now all actually performed experiments do not a... |
1510.05604 | Shahar Hod | Shahar Hod | On the branching of the quasinormal resonances of near-extremal Kerr
black holes | 3 pages | The European Physical Journal C 75, 520 (2015) | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been shown by Yang. et. al. [Phys. Rev. D {\bf 87}, 041502(R)
(2013)] that rotating Kerr black holes are characterized by two distinct sets
of quasinormal resonances. These two families of quasinormal resonances display
qualitatively different asymptotic behaviors in the extremal ($a/M\to 1$)
black-ho... | [
{
"created": "Mon, 19 Oct 2015 18:04:47 GMT",
"version": "v1"
}
] | 2016-01-26 | [
[
"Hod",
"Shahar",
""
]
] | It has recently been shown by Yang. et. al. [Phys. Rev. D {\bf 87}, 041502(R) (2013)] that rotating Kerr black holes are characterized by two distinct sets of quasinormal resonances. These two families of quasinormal resonances display qualitatively different asymptotic behaviors in the extremal ($a/M\to 1$) black-hole... |
2206.08200 | Antonio Ferreiro | Antonio Ferreiro and Silvia Pla | Adiabatic regularization and preferred vacuum state for the $\lambda
\phi^4$ field theory in cosmological spacetimes | null | null | 10.1103/PhysRevD.106.065015 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We extend the method of adiabatic regularization by introducing an arbitrary
parameter $\mu$ for a scalar field with quartic self-coupling in a
Friedmann-Lema\^itre-Robertson-Walker (FLRW) spacetime at one-loop order. The
subtraction terms constructed from this extended version allow us to define a
preferred vacuum s... | [
{
"created": "Thu, 16 Jun 2022 14:14:41 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Apr 2023 08:52:24 GMT",
"version": "v2"
}
] | 2023-04-21 | [
[
"Ferreiro",
"Antonio",
""
],
[
"Pla",
"Silvia",
""
]
] | We extend the method of adiabatic regularization by introducing an arbitrary parameter $\mu$ for a scalar field with quartic self-coupling in a Friedmann-Lema\^itre-Robertson-Walker (FLRW) spacetime at one-loop order. The subtraction terms constructed from this extended version allow us to define a preferred vacuum sta... |
gr-qc/9804045 | Benjamin C. Harms | R. Casadio and B. Harms | Perturbations in the Kerr-Newman Dilatonic Black Hole Background:
Maxwell Waves, the Dilaton Background and Gravitational Lensing | 9 pages, 1 figure | Phys.Rev. D58 (1998) 044015 | 10.1103/PhysRevD.58.044015 | UAHEP 979 | gr-qc hep-th | null | In this paper we continue the analysis of our previous papers and study the
affect of the existence of a non-trivial dilaton background on the propagation
of electromagnetic waves in the Kerr-Newman dilatonic black hole space-time.
For this purpose we again employ the double expansion in both the background
electric ... | [
{
"created": "Mon, 20 Apr 1998 21:48:20 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Casadio",
"R.",
""
],
[
"Harms",
"B.",
""
]
] | In this paper we continue the analysis of our previous papers and study the affect of the existence of a non-trivial dilaton background on the propagation of electromagnetic waves in the Kerr-Newman dilatonic black hole space-time. For this purpose we again employ the double expansion in both the background electric ch... |
0801.0905 | Haiqing Zhang | Chao-Guang Huang, Hai-Qing Zhang, Han-Ying Guo | Cosmological Solutions with Torsion in a Model of de Sitter Gauge Theory
of Gravity | 16 pages, 2 figures | JCAP 0810:010,2008 | 10.1088/1475-7516/2008/10/010 | null | gr-qc | null | The torsion is shown to be vitally important in the explanation of the
evolution of the universe in a large class of gravitational theories containing
quadratic terms of curvature and torsion. The cosmological solutions with
homogeneous and isotropic torsion in a model of de Sitter gauge theory of
gravity are present... | [
{
"created": "Mon, 7 Jan 2008 05:34:48 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Huang",
"Chao-Guang",
""
],
[
"Zhang",
"Hai-Qing",
""
],
[
"Guo",
"Han-Ying",
""
]
] | The torsion is shown to be vitally important in the explanation of the evolution of the universe in a large class of gravitational theories containing quadratic terms of curvature and torsion. The cosmological solutions with homogeneous and isotropic torsion in a model of de Sitter gauge theory of gravity are presented... |
2103.04435 | Patrick Bourg | Carsten Gundlach, Patrick Bourg and Alex Davey | Fully constrained, high-resolution shock-capturing, formulation of the
Einstein-fluid equations in $2+1$ dimensions | 23 pages, 17 figures, Typos corrected. This version has been accepted
by PRD | Phys. Rev. D 104, 024061 (2021) | 10.1103/PhysRevD.104.024061 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Four components of the axisymmetric Einstein equations in 2+1 dimensions with
negative cosmological constant can be written as $\nabla_aM=\dots$ and
$\nabla_aJ=\dots$, where the dots stand for stress-energy terms, and $M$ and
$J$ are scalars. In vacuum, they reduce to the constant mass and angular
momentum parameters... | [
{
"created": "Sun, 7 Mar 2021 19:44:35 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Aug 2021 15:31:56 GMT",
"version": "v2"
}
] | 2021-08-10 | [
[
"Gundlach",
"Carsten",
""
],
[
"Bourg",
"Patrick",
""
],
[
"Davey",
"Alex",
""
]
] | Four components of the axisymmetric Einstein equations in 2+1 dimensions with negative cosmological constant can be written as $\nabla_aM=\dots$ and $\nabla_aJ=\dots$, where the dots stand for stress-energy terms, and $M$ and $J$ are scalars. In vacuum, they reduce to the constant mass and angular momentum parameters o... |
1508.02569 | Scott Robertson | Scott Robertson | The theory of Hawking radiation in laboratory analogues | 87 pages, 20 figures | J. Phys. B: At. Mol. Opt. Phys. 45 163001 (2012) | 10.1088/0953-4075/45/16/163001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking radiation, despite being known to theoretical physics for nearly
forty years, remains elusive and undetected. It also suffers, in its original
context of gravitational black holes, from practical and conceptual
difficulties. Of particular note is the trans-Planckian problem, which is
concerned with the appare... | [
{
"created": "Tue, 11 Aug 2015 11:52:31 GMT",
"version": "v1"
}
] | 2015-08-12 | [
[
"Robertson",
"Scott",
""
]
] | Hawking radiation, despite being known to theoretical physics for nearly forty years, remains elusive and undetected. It also suffers, in its original context of gravitational black holes, from practical and conceptual difficulties. Of particular note is the trans-Planckian problem, which is concerned with the apparent... |
2011.02276 | Mubasher Jamil | M. Ghasemi-Nodehi, Mustapha Azreg-A\"inou, Kimet Jusufi, Mubasher
Jamil | Shadow, quasinormal modes and quasiperiodic oscillations of rotating
Kaluza-Klein black holes | 15 pages, 14 captioned figures, to appear in Phys. Rev. D. arXiv
admin note: text overlap with arXiv:2008.08450 | Phys. Rev. D 102, 104032 (2020) | 10.1103/PhysRevD.102.104032 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the shadow of rotating Kaluza-Klein (KK) black holes
and the connection between the shadow radius and the real part of quasi-normal
modes (QNMs) in the eiokonal limit. In addition we have explored the
quasi-periodic oscillations (QPOs) in the rotating KK black hole.
| [
{
"created": "Mon, 2 Nov 2020 07:41:57 GMT",
"version": "v1"
}
] | 2020-11-13 | [
[
"Ghasemi-Nodehi",
"M.",
""
],
[
"Azreg-Aïnou",
"Mustapha",
""
],
[
"Jusufi",
"Kimet",
""
],
[
"Jamil",
"Mubasher",
""
]
] | In this paper we study the shadow of rotating Kaluza-Klein (KK) black holes and the connection between the shadow radius and the real part of quasi-normal modes (QNMs) in the eiokonal limit. In addition we have explored the quasi-periodic oscillations (QPOs) in the rotating KK black hole. |
2404.02435 | Javier Roulet | Javier Roulet, Jonathan Mushkin, Digvijay Wadekar, Tejaswi Venumadhav,
Barak Zackay and Matias Zaldarriaga | Fast marginalization algorithm for optimizing gravitational wave
detection, parameter estimation and sky localization | 19 pages, 7 figures | Phys. Rev. D 110, 044010 (2024) | 10.1103/PhysRevD.110.044010 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an algorithm to marginalize the likelihood for a gravitational
wave signal from a quasi-circular binary merger over its extrinsic parameters,
accounting for the effects of higher harmonics and spin-induced precession. The
algorithm takes as input the matched-filtering time series of individual
waveform h... | [
{
"created": "Wed, 3 Apr 2024 03:44:27 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Aug 2024 19:52:10 GMT",
"version": "v2"
}
] | 2024-08-06 | [
[
"Roulet",
"Javier",
""
],
[
"Mushkin",
"Jonathan",
""
],
[
"Wadekar",
"Digvijay",
""
],
[
"Venumadhav",
"Tejaswi",
""
],
[
"Zackay",
"Barak",
""
],
[
"Zaldarriaga",
"Matias",
""
]
] | We introduce an algorithm to marginalize the likelihood for a gravitational wave signal from a quasi-circular binary merger over its extrinsic parameters, accounting for the effects of higher harmonics and spin-induced precession. The algorithm takes as input the matched-filtering time series of individual waveform har... |
gr-qc/0406031 | Sujit Chatterjee | A.banerjee and S.Chatterjee | Spherical collapse of a heat conducting fluid in higher dimensions
without horizon | 6 pages | Astrophys.Space Sci. 299 (2005) 219-225 | 10.1007/s10509-005-6849-x | null | gr-qc | null | We consider a scenario where the interior spacetime,described by a heat
conducting fluid sphere is matched to a Vaidya metric in higher
dimensions.Interestingly we get a class of solutions, where following heat
radiation the boundary surface collapses without the appearance of an event
horizon at any stage and this h... | [
{
"created": "Tue, 8 Jun 2004 12:35:36 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"banerjee",
"A.",
""
],
[
"Chatterjee",
"S.",
""
]
] | We consider a scenario where the interior spacetime,described by a heat conducting fluid sphere is matched to a Vaidya metric in higher dimensions.Interestingly we get a class of solutions, where following heat radiation the boundary surface collapses without the appearance of an event horizon at any stage and this hap... |
gr-qc/0210083 | Elena Cuoco | G. Cella, E. Cuoco, G.M. Guidi | Adaptive spectral identification techniques in presence of undetected
non linearities | 4 pages, 2 figures, uses ws-procs9x6.cls Proceedings of "Non linear
physics: theory and experiment. II", Gallipoli (Lecce), 2002 | null | 10.1142/9789812704467_0048 | null | gr-qc | null | The standard procedure for detection of gravitational wave coalescing
binaries signals is based on Wiener filtering with an appropriate bank of
template filters. This is the optimal procedure in the hypothesis of addictive
Gaussian and stationary noise. We study the possibility of improving the
detection efficiency w... | [
{
"created": "Thu, 24 Oct 2002 08:00:37 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Cella",
"G.",
""
],
[
"Cuoco",
"E.",
""
],
[
"Guidi",
"G. M.",
""
]
] | The standard procedure for detection of gravitational wave coalescing binaries signals is based on Wiener filtering with an appropriate bank of template filters. This is the optimal procedure in the hypothesis of addictive Gaussian and stationary noise. We study the possibility of improving the detection efficiency wit... |
1902.03704 | Jos\'e Villanueva | \'Angel Rinc\'on and J.R. Villanueva | The Sagnac effect on a scale-dependent rotating BTZ black hole
background | 6 pages, 5 figures | null | 10.1088/1361-6382/aba17f | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the Sagnac effect by calculating the difference
in travel time and phase shift observed for photon beams counter--propagating
in a rotating interferometer on a BTZ black hole solution in the context of
scale-dependent gravity, which describes the field around a massive static and
rotating... | [
{
"created": "Mon, 11 Feb 2019 02:30:45 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Rincón",
"Ángel",
""
],
[
"Villanueva",
"J. R.",
""
]
] | In this paper we investigate the Sagnac effect by calculating the difference in travel time and phase shift observed for photon beams counter--propagating in a rotating interferometer on a BTZ black hole solution in the context of scale-dependent gravity, which describes the field around a massive static and rotating o... |
gr-qc/0302099 | Theodore A. Jacobson | Ted Jacobson and Renaud Parentani | Horizon Entropy | 21 pages, one figure, to appear in a special issue of Foundations of
Physics in honor of Jacob Bekenstein | Found.Phys. 33 (2003) 323-348 | 10.1023/A:1023785123428 | null | gr-qc hep-th | null | Although the laws of thermodynamics are well established for black hole
horizons, much less has been said in the literature to support the extension of
these laws to more general settings such as an asymptotic de Sitter horizon or
a Rindler horizon (the event horizon of an asymptotic uniformly accelerated
observer). ... | [
{
"created": "Tue, 25 Feb 2003 05:42:47 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Jacobson",
"Ted",
""
],
[
"Parentani",
"Renaud",
""
]
] | Although the laws of thermodynamics are well established for black hole horizons, much less has been said in the literature to support the extension of these laws to more general settings such as an asymptotic de Sitter horizon or a Rindler horizon (the event horizon of an asymptotic uniformly accelerated observer). In... |
gr-qc/0011083 | Shijun Yoshida | Toshifumi Futamase, Shijun Yoshida | Possible measurement of Quintessence and density parameter using strong
gravitational lensing events | 5 pages, 1 figure, accepted for publication in Progress of
Theoretical Physics | null | 10.1143/PTP.105.887 | null | gr-qc astro-ph | null | We propose a possible measurement of the time variability of the vacuum
energy using strong gravitational lensing events. As an example we take an
Einstein cross lens HST 14176+5226 and demonstrate that the measurement of the
velocity dispersion with the accuracy of $\pm$ 5 km/sec will have a chance to
determine the ... | [
{
"created": "Thu, 23 Nov 2000 12:37:59 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2001 05:12:34 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Futamase",
"Toshifumi",
""
],
[
"Yoshida",
"Shijun",
""
]
] | We propose a possible measurement of the time variability of the vacuum energy using strong gravitational lensing events. As an example we take an Einstein cross lens HST 14176+5226 and demonstrate that the measurement of the velocity dispersion with the accuracy of $\pm$ 5 km/sec will have a chance to determine the ti... |
0809.3547 | Jorge Ovalle | J Ovalle | Non-uniform Braneworld Stars: an Exact Solution | 22 pages, 3 figures, version to be published in International Journal
of Modern Physics D (IJMPD) | Int.J.Mod.Phys.D18:837-852,2009 | 10.1142/S0218271809014790 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first exact interior solution to Einstein's field equations for a static
and non-uniform braneworld star with local and non-local bulk terms is
presented. It is shown that the bulk Weyl scalar ${\cal U}(r)$ is always
negative inside the stellar distribution, in consequence it reduces both the
effective density an... | [
{
"created": "Sun, 21 Sep 2008 02:40:49 GMT",
"version": "v1"
}
] | 2009-07-22 | [
[
"Ovalle",
"J",
""
]
] | The first exact interior solution to Einstein's field equations for a static and non-uniform braneworld star with local and non-local bulk terms is presented. It is shown that the bulk Weyl scalar ${\cal U}(r)$ is always negative inside the stellar distribution, in consequence it reduces both the effective density and ... |
2301.11052 | Parth Bambhaniya | Vishva Patel, Kauntey Acharya, Parth Bambhaniya and Pankaj S. Joshi | Energy extraction from Janis-Newman-Winicour naked singularity | 11 pages, 18 figures | null | 10.1103/PhysRevD.107.064036 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In general, energy extraction methods such as the Penrose process and the
magnetic Penrose process are thought to be reliant on the existence of an
ergoregion. Inside an ergoregion, there are negative energy states that allow a
particle to extract energy and escape to an observer at infinity. In this
paper, we consid... | [
{
"created": "Thu, 26 Jan 2023 11:56:59 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"Patel",
"Vishva",
""
],
[
"Acharya",
"Kauntey",
""
],
[
"Bambhaniya",
"Parth",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | In general, energy extraction methods such as the Penrose process and the magnetic Penrose process are thought to be reliant on the existence of an ergoregion. Inside an ergoregion, there are negative energy states that allow a particle to extract energy and escape to an observer at infinity. In this paper, we consider... |
gr-qc/0503095 | Elizabeth Winstanley | Eugen Radu and Elizabeth Winstanley | Conformally coupled scalar solitons and black holes with negative
cosmological constant | 18 pages, 10 figures, minor changes, accepted for publication in
Phys. Rev. D | Phys.Rev. D72 (2005) 024017 | 10.1103/PhysRevD.72.024017 | null | gr-qc hep-th | null | We present arguments for the existence of both globally regular and black
hole solutions of the Einstein equations with a conformally coupled scalar
field, in the presence of a negative cosmological constant, for space-time
dimensions greater than or equal to four. These configurations approach
asymptotically anti-de... | [
{
"created": "Tue, 22 Mar 2005 19:35:36 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2005 11:27:11 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Radu",
"Eugen",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | We present arguments for the existence of both globally regular and black hole solutions of the Einstein equations with a conformally coupled scalar field, in the presence of a negative cosmological constant, for space-time dimensions greater than or equal to four. These configurations approach asymptotically anti-de S... |
gr-qc/9612024 | Stefano Liberati | F. Belgiorno and S. Liberati | Black Hole Thermodynamics, Casimir Effect and Induced Gravity | 7 pages, RevTex | Gen.Rel.Grav. 29 (1997) 1181-1194 | 10.1023/A:1018895226085 | SISSA-178/96/A | gr-qc hep-th | null | An analogy between the subtraction procedure in the Gibbons-Hawking Euclidean
path integral approach to Horizon's Thermodynamics and the Casimir effect is
shown. Then a conjecture about a possible Casimir nature of the Gibbons-Hawking
subtraction is made in the framework of Sakharov's induced gravity. In this
framewo... | [
{
"created": "Wed, 11 Dec 1996 09:47:27 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Belgiorno",
"F.",
""
],
[
"Liberati",
"S.",
""
]
] | An analogy between the subtraction procedure in the Gibbons-Hawking Euclidean path integral approach to Horizon's Thermodynamics and the Casimir effect is shown. Then a conjecture about a possible Casimir nature of the Gibbons-Hawking subtraction is made in the framework of Sakharov's induced gravity. In this framework... |
gr-qc/0309054 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | The three perspectives on the quantum-gravity problem and their
implications for the fate of Lorentz symmetry | 48 pages, LaTex. Based on invited seminars given at "Perspectives on
Quantum Gravity: a tribute to John Stachel" (Boston, March 6-7, 2003) and
"Tenth Marcel Grossmann Meeting on General Relativity" (Rio de Janeiro, July
20-26, 2003) | null | null | null | gr-qc hep-ph hep-th | null | Each approach to the quantum-gravity problem originates from expertise in one
or another area of theoretical physics. The particle-physics perspective
encourages one to attempt to reproduce in quantum gravity as much as possible
of the successes of the Standard Model of particle physics, and therefore, as
done in Str... | [
{
"created": "Tue, 9 Sep 2003 17:58:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | Each approach to the quantum-gravity problem originates from expertise in one or another area of theoretical physics. The particle-physics perspective encourages one to attempt to reproduce in quantum gravity as much as possible of the successes of the Standard Model of particle physics, and therefore, as done in Strin... |
1305.2875 | Frans Klinkhamer | F.R. Klinkhamer | Black-hole solution without curvature singularity and closed timelike
curves | 10 pages; v6: published version | Acta Phys. Pol. B 45, 5 (2014) | 10.5506/APhysPolB.45.5 | KA-TP-11-2013 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With a prescribed Coulomb-type energy-momentum tensor, an exact solution of
the Einstein field equations over a nonsimply-connected manifold is presented.
This spherically symmetric solution has neither curvature singularities nor
closed timelike curves. It can be considered to be a regularization of the
singular Rei... | [
{
"created": "Mon, 13 May 2013 17:58:24 GMT",
"version": "v1"
},
{
"created": "Thu, 30 May 2013 18:53:06 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Jul 2013 12:55:56 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Oct 2013 08:43:00 GMT",
"version": "v4"
},
{
"c... | 2015-06-15 | [
[
"Klinkhamer",
"F. R.",
""
]
] | With a prescribed Coulomb-type energy-momentum tensor, an exact solution of the Einstein field equations over a nonsimply-connected manifold is presented. This spherically symmetric solution has neither curvature singularities nor closed timelike curves. It can be considered to be a regularization of the singular Reiss... |
gr-qc/9806115 | Viqar Husain | Viqar Husain | Apparent horizons, black hole entropy and loop quantum gravity | 9 pages, RevTeX, published version (minor changes) | Phys.Rev. D59 (1999) 084019 | 10.1103/PhysRevD.59.084019 | UBC-TH | gr-qc hep-th | null | In recent work on black hole entropy in non-perturbative quantum gravity, an
action for the black hole sector of the phase space is introduced and
(partially) quantized. We give a number of observations on this and related
works. In particular we show that (I) the entropy calculation applies without
change to general... | [
{
"created": "Mon, 29 Jun 1998 20:01:46 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Apr 1999 20:19:29 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Husain",
"Viqar",
""
]
] | In recent work on black hole entropy in non-perturbative quantum gravity, an action for the black hole sector of the phase space is introduced and (partially) quantized. We give a number of observations on this and related works. In particular we show that (I) the entropy calculation applies without change to generally... |
1508.02565 | Koray D\"uzta\c{s} | Koray D\"uzta\c{s}, \.Ibrahim Semiz | The decoupling problem of the Proca equation; and treatment of Dirac,
Maxwell and Proca fields on the resulting pp-wave spacetimes | published version | Gen Relativ Gravit (2016) 48:99 | 10.1007/s10714-016-2097-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we take a formal approach to the problem of decoupling Proca
equations in curved space-times. We use Newman-Penrose (NP) two-spinor
formalism to represent the Proca vector by one complex and two real scalars. We
show that a decoupled second order differential equation for one of the real
scalars can be d... | [
{
"created": "Tue, 11 Aug 2015 11:35:55 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Aug 2015 22:07:46 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Dec 2015 23:35:15 GMT",
"version": "v3"
},
{
"created": "Tue, 2 Feb 2016 22:56:36 GMT",
"version": "v4"
},
{
"cre... | 2016-06-24 | [
[
"Düztaş",
"Koray",
""
],
[
"Semiz",
"İbrahim",
""
]
] | In this work we take a formal approach to the problem of decoupling Proca equations in curved space-times. We use Newman-Penrose (NP) two-spinor formalism to represent the Proca vector by one complex and two real scalars. We show that a decoupled second order differential equation for one of the real scalars can be der... |
2308.10924 | Jan Ambjorn | Jan Ambjorn and Yoshiyuki Watabiki | Is the present acceleration of the Universe caused by merging with other
universes? | null | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that by allowing our Universe to merge with other universes one is
lead to modified Friedmann equations that explain the present accelerated
expansion of our Universe without the need of a cosmological constant.
| [
{
"created": "Mon, 21 Aug 2023 17:37:24 GMT",
"version": "v1"
}
] | 2023-08-23 | [
[
"Ambjorn",
"Jan",
""
],
[
"Watabiki",
"Yoshiyuki",
""
]
] | We show that by allowing our Universe to merge with other universes one is lead to modified Friedmann equations that explain the present accelerated expansion of our Universe without the need of a cosmological constant. |
2006.06129 | El\'ias Castellanos Dr. | El\'ias Castellanos and Celia Escamilla-Rivera | Dark energy as generalised superfluid excitations | 5 pages, 1 figure | null | null | null | gr-qc cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a generic form of the cosmological Equation of State
derived from the formalism of Statistical Mechanics, assuming that a cosmic
acceleration scenario can be interpreted as a system of quasi-particles. By
considering a generalised superfluidity approach, in which the energy spectrum
can be mo... | [
{
"created": "Thu, 11 Jun 2020 00:41:43 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Dec 2020 04:28:00 GMT",
"version": "v2"
}
] | 2020-12-14 | [
[
"Castellanos",
"Elías",
""
],
[
"Escamilla-Rivera",
"Celia",
""
]
] | In this paper we present a generic form of the cosmological Equation of State derived from the formalism of Statistical Mechanics, assuming that a cosmic acceleration scenario can be interpreted as a system of quasi-particles. By considering a generalised superfluidity approach, in which the energy spectrum can be modu... |
2004.08292 | Betti Hartmann | Y. Brihaye, L. Ducobu, and B. Hartmann | Boson and neutron stars with increased density | Matches version published in Phys. Lett. B | null | 10.1016/j.physletb.2020.135906 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss boson stars and neutron stars, respectively, in a scalar-tensor
gravity model with an explicitly time-dependent real scalar field. While the
boson stars in our model -- in contrast to the neutron stars -- do not possess
a hard core, we find that the qualitative effects of the formation of scalar
hair are s... | [
{
"created": "Fri, 17 Apr 2020 15:07:34 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jan 2021 18:26:00 GMT",
"version": "v2"
},
{
"created": "Tue, 3 May 2022 09:01:13 GMT",
"version": "v3"
}
] | 2022-05-04 | [
[
"Brihaye",
"Y.",
""
],
[
"Ducobu",
"L.",
""
],
[
"Hartmann",
"B.",
""
]
] | We discuss boson stars and neutron stars, respectively, in a scalar-tensor gravity model with an explicitly time-dependent real scalar field. While the boson stars in our model -- in contrast to the neutron stars -- do not possess a hard core, we find that the qualitative effects of the formation of scalar hair are sim... |
gr-qc/9302030 | null | B. L. Hu | Critical Dynamics in the Early Universe | umdpp 93-57, 12 pages, Latex Invited talk given at the Journees
Relativistes, Amsterdam, May 1992. Conference Proceedings edited by W. A. van
Leeuwen to appear in Classical and Quantum Gravity | Class.Quant.Grav.10:S93-S100,1993 | 10.1088/0264-9381/10/S/009 | null | gr-qc | null | Methods and concepts for the study of phase transitions mediated by a
time-dependent order-parameter field in curved spacetimes are discussed. A
practical example is the derivation of an effective (quasi-)potential for the
description of `slow-roll' inflation in the early universe. We first summarize
our early result... | [
{
"created": "Mon, 22 Feb 1993 20:01:00 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Hu",
"B. L.",
""
]
] | Methods and concepts for the study of phase transitions mediated by a time-dependent order-parameter field in curved spacetimes are discussed. A practical example is the derivation of an effective (quasi-)potential for the description of `slow-roll' inflation in the early universe. We first summarize our early results ... |
2004.13554 | Sushovan Mondal | Sushovan Mondal, Saif Ali, Shanima S, Narayan Banerjee and Golam
Mortuza Hossain | Propagation of gravitational waves in various cosmological backgrounds | 17 pages, 6 figures | null | 10.1007/s10714-021-02835-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work investigates some exact solutions of the gravitational wave
equation in some widely used cosmological spacetimes. The examples are taken
from spatially flat and closed isotropic models as well as Kasner metric which
is anisotropic. Various matter distributions are considered, from the standard
dust o... | [
{
"created": "Tue, 28 Apr 2020 14:24:07 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Jul 2021 06:34:27 GMT",
"version": "v2"
}
] | 2021-07-06 | [
[
"Mondal",
"Sushovan",
""
],
[
"Ali",
"Saif",
""
],
[
"S",
"Shanima",
""
],
[
"Banerjee",
"Narayan",
""
],
[
"Hossain",
"Golam Mortuza",
""
]
] | The present work investigates some exact solutions of the gravitational wave equation in some widely used cosmological spacetimes. The examples are taken from spatially flat and closed isotropic models as well as Kasner metric which is anisotropic. Various matter distributions are considered, from the standard dust or ... |
1403.3852 | Adrian Ciprian Sporea | Ciprian A. Sporea | Notes on f(R) Theories of Gravity | 46 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review paper we present some basic notions about f(R) theories of
gravity and some simple cosmological models derived from it. We first make an
introduction to General Relativity (GR), followed by the discussion of
Gibbons-York-Hawking boundary term in GR. We also discuss boundary terms in
f(R) theories and t... | [
{
"created": "Sat, 15 Mar 2014 21:33:34 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2014 16:03:44 GMT",
"version": "v2"
}
] | 2014-03-20 | [
[
"Sporea",
"Ciprian A.",
""
]
] | In this review paper we present some basic notions about f(R) theories of gravity and some simple cosmological models derived from it. We first make an introduction to General Relativity (GR), followed by the discussion of Gibbons-York-Hawking boundary term in GR. We also discuss boundary terms in f(R) theories and the... |
gr-qc/9407042 | Christodoulakis Theodosios | T.Christodoulakis, E.Korfiatis, E.C. Vagenas | Simultaneous Hamiltonian Treatment of Class A Spacetimes and Reduction
of Degrees of Freedom at the Quantum Level | Revised in 2002, LaTeX, 12 pages, G&C style, published version | Grav.Cosmol.8:213-221,2002 | null | University of Athens, preprint UA/NPPS-17, June 1994 | gr-qc hep-th | null | We consider the quantization of a general spatially homogeneous space-time
belonging to an arbitrary but fixed Class A Bianchi type. Exploiting the
information furnished by the quantum version of the momentum constraints, we
use as variables the two simplest contractions of $C^{\alpha}_{\beta \gamma}$
and $\gamma_{\a... | [
{
"created": "Thu, 28 Jul 1994 08:38:56 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2001 09:47:53 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jun 2001 06:04:21 GMT",
"version": "v3"
},
{
"created": "Wed, 20 Mar 2002 11:12:35 GMT",
"version": "v4"
},
{
"c... | 2011-07-19 | [
[
"Christodoulakis",
"T.",
""
],
[
"Korfiatis",
"E.",
""
],
[
"Vagenas",
"E. C.",
""
]
] | We consider the quantization of a general spatially homogeneous space-time belonging to an arbitrary but fixed Class A Bianchi type. Exploiting the information furnished by the quantum version of the momentum constraints, we use as variables the two simplest contractions of $C^{\alpha}_{\beta \gamma}$ and $\gamma_{\alp... |
0902.2764 | Simone Mercuri | Simone Mercuri | Peccei--Quinn mechanism in gravity and the nature of the
Barbero--Immirzi parameter | Accepted for publication on Phys. Rev. Lett | Phys.Rev.Lett.103:081302,2009 | 10.1103/PhysRevLett.103.081302 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general argument provides the motivation to consider the Barbero--Immirzi
parameter as a field. The specific form of the geometrical effective action
allows to relate the value of the Barbero--Immirzi parameter to other quantum
ambiguities through the analog of the Peccei--Quinn mechanism.
| [
{
"created": "Mon, 16 Feb 2009 19:22:56 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jul 2009 09:39:11 GMT",
"version": "v2"
}
] | 2009-09-02 | [
[
"Mercuri",
"Simone",
""
]
] | A general argument provides the motivation to consider the Barbero--Immirzi parameter as a field. The specific form of the geometrical effective action allows to relate the value of the Barbero--Immirzi parameter to other quantum ambiguities through the analog of the Peccei--Quinn mechanism. |
1906.06287 | Jose Geraldo Pereira | J. G. Pereira, Y. N. Obukhov | Gauge Structure of Teleparallel Gravity | 8 pages. Contribution to the proceedings of the workshop
"Teleparallel Universes in Salamanca", Salamanca, Spain, 26-28 November 2018 | Universe 5 (2019) 139 | 10.3390/universe5060139 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During the conference "Teleparallel Universes in Salamanca", we became aware
of a recent paper [M. Fontanini, E. Huguet, and M. Le Delliou, Phys. Rev. D 99
(2019) 064006] in which some criticisms on the interpretation of teleparallel
gravity as a gauge theory for the translation group were put forward. This
triggered... | [
{
"created": "Fri, 14 Jun 2019 16:50:58 GMT",
"version": "v1"
}
] | 2019-06-17 | [
[
"Pereira",
"J. G.",
""
],
[
"Obukhov",
"Y. N.",
""
]
] | During the conference "Teleparallel Universes in Salamanca", we became aware of a recent paper [M. Fontanini, E. Huguet, and M. Le Delliou, Phys. Rev. D 99 (2019) 064006] in which some criticisms on the interpretation of teleparallel gravity as a gauge theory for the translation group were put forward. This triggered a... |
0709.3002 | Fernando de Felice | Fernando de Felice and Giovanni Preti | A generalized Principle of Relativity | 18 pages, no figures | null | null | null | gr-qc | null | In this paper we bring to light an hitherto undisclosed richness of this
Theory, namely its admitting a consistent reformulation which is able to
provide a unified scenario for all kinds of particles, be they lightlike or
not. This result hinges on a "generalized" Principle of Relativity which is
{intrinsic} to Einst... | [
{
"created": "Wed, 19 Sep 2007 12:18:35 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Apr 2008 10:26:19 GMT",
"version": "v2"
}
] | 2008-04-14 | [
[
"de Felice",
"Fernando",
""
],
[
"Preti",
"Giovanni",
""
]
] | In this paper we bring to light an hitherto undisclosed richness of this Theory, namely its admitting a consistent reformulation which is able to provide a unified scenario for all kinds of particles, be they lightlike or not. This result hinges on a "generalized" Principle of Relativity which is {intrinsic} to Einstei... |
1202.6214 | Martin Cermak | Martin Cermak, Martin Zouhar | Thin static charged dust Majumdar-Papapetrou shells with high symmetry
in D >= 4 | Accepted in Int. J. Theor. Phys | null | 10.1007/s10773-012-1126-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematical study of static D >= 4 space-times of high symmetry
with the matter source being a thin charged dust hypersurface shell. The shell
manifold is assumed to have the following structure S_(beta) X R^(D-2-beta),
beta (in the interval <0,...,D-2>) is dimension of a sphere S_(beta). In case
of (be... | [
{
"created": "Tue, 28 Feb 2012 13:39:09 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Apr 2012 08:41:37 GMT",
"version": "v2"
}
] | 2012-04-30 | [
[
"Cermak",
"Martin",
""
],
[
"Zouhar",
"Martin",
""
]
] | We present a systematical study of static D >= 4 space-times of high symmetry with the matter source being a thin charged dust hypersurface shell. The shell manifold is assumed to have the following structure S_(beta) X R^(D-2-beta), beta (in the interval <0,...,D-2>) is dimension of a sphere S_(beta). In case of (beta... |
gr-qc/9708014 | null | Vladimir S. Mashkevich (Institute of Physics, Kiev) | Indeterministic Quantum Gravity and Cosmology VIII. Gravilon:
Gravitational Autolocalization | 7 pages, LATEX 2e, uses amssymb | null | null | IP 11/97 | gr-qc | null | This paper is a sequel to the series of papers [gr-qc/9409010, gr-qc/9505034,
gr-qc/9603022, gr-qc/9609035, gr-qc/9609046, gr-qc/9704033, gr-qc/9704038].
Gravitational autolocalization of a body is considered. A self-consistent
problem is solved: A quantum state of the center of mass of the body gives rise
to a class... | [
{
"created": "Thu, 7 Aug 1997 10:33:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mashkevich",
"Vladimir S.",
"",
"Institute of Physics, Kiev"
]
] | This paper is a sequel to the series of papers [gr-qc/9409010, gr-qc/9505034, gr-qc/9603022, gr-qc/9609035, gr-qc/9609046, gr-qc/9704033, gr-qc/9704038]. Gravitational autolocalization of a body is considered. A self-consistent problem is solved: A quantum state of the center of mass of the body gives rise to a classic... |
2310.09905 | Harkirat Singh Sahota | Harkirat Singh Sahota | Imprints of the operator ordering ambiguity on the dynamics of perfect
fluid dominated quantum universe | 21 pages and 7 figures, Matches the published version | null | 10.1088/1361-6382/ad638a | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sharply peaked quantum states are conjectured to be conducive to the notion
of a quantum-corrected spacetime. We investigate this conjecture for a
flat-FLRW model with perfect fluid, where a generalized ordering scheme is
considered for the gravitational Hamiltonian. We study the implications of
different ordering ch... | [
{
"created": "Sun, 15 Oct 2023 18:16:24 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Feb 2024 16:29:25 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Jul 2024 14:08:50 GMT",
"version": "v3"
}
] | 2024-07-30 | [
[
"Sahota",
"Harkirat Singh",
""
]
] | Sharply peaked quantum states are conjectured to be conducive to the notion of a quantum-corrected spacetime. We investigate this conjecture for a flat-FLRW model with perfect fluid, where a generalized ordering scheme is considered for the gravitational Hamiltonian. We study the implications of different ordering choi... |
gr-qc/9710078 | Kouji Nakamura | K. Nakamura, H. Ishihara | Cylindrical Domain Walls and Gravitational Waves -- Einstein Rosen wave
emission from momentarily static initial configuration -- | 3 pages, latex requires mprocl.sty, no figures. To appear in the
proceedings of the Eighth Marcel Grossmann Conference on General Relativity
(Jerusalem, Israel, June 1997) | null | null | null | gr-qc | null | A self-gravitating cylindrical domain wall is considered as an example of
non-spherical wall to clarify the interaction between a domain wall and
gravitational waves. We consider the time evolution from a momentarily static
initial configuration within an infinitesimal time interval using the metric
junction formalis... | [
{
"created": "Wed, 15 Oct 1997 09:15:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nakamura",
"K.",
""
],
[
"Ishihara",
"H.",
""
]
] | A self-gravitating cylindrical domain wall is considered as an example of non-spherical wall to clarify the interaction between a domain wall and gravitational waves. We consider the time evolution from a momentarily static initial configuration within an infinitesimal time interval using the metric junction formalism.... |
gr-qc/0608095 | Shuichi Sato | Shuichi Sato, Seiji Kawamura, Keiko Kokeyama, Robert L. Ward, Yanbei
Chen, Archana Pai, and Kentaro Somiya | Demonstration of displacement- and frequency-noise free laser
interferometry using bi-directional Mach-Zehnder interferometers | 5 pages, 5 figures, now on PRL 98, 141101 (2007) | Phys.Rev.Lett.98:141101,2007 | 10.1103/PhysRevLett.98.141101 | null | gr-qc astro-ph | null | We have demonstrated displacement- and frequency-noise free laser
interferometry (DFI) by partially implementing a recently proposed optical
configuration using bi-directional Mach-Zehnder interferometers (MZI). This
partial implementation, the minimum necessary to be called DFI, has confirmed
the essential feature o... | [
{
"created": "Sun, 20 Aug 2006 04:19:45 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Apr 2007 00:48:35 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sato",
"Shuichi",
""
],
[
"Kawamura",
"Seiji",
""
],
[
"Kokeyama",
"Keiko",
""
],
[
"Ward",
"Robert L.",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Pai",
"Archana",
""
],
[
"Somiya",
"Kentaro",
""
]
] | We have demonstrated displacement- and frequency-noise free laser interferometry (DFI) by partially implementing a recently proposed optical configuration using bi-directional Mach-Zehnder interferometers (MZI). This partial implementation, the minimum necessary to be called DFI, has confirmed the essential feature of ... |
gr-qc/9607044 | Hugo Morales Tecotl | Hugo A. Morales-Tecotl, Luis F. Urrutia and J. David Vergara | Reality conditions for Ashtekar variables as Dirac constraints | 16 pages, plain LaTeX, submitted to Class. Quant. Grav. E-mail:
hugo@xanum.uam.mx | Class.Quant.Grav. 13 (1996) 2933-2940 | 10.1088/0264-9381/13/11/009 | null | gr-qc hep-th | null | We show that the reality conditions to be imposed on Ashtekar variables to
recover real gravity can be implemented as second class constraints a la Dirac.
Thus, counting gravitational degrees of freedom follows accordingly. Some
constraints of the real theory turn out to be non-polynomial, regardless of the
form, pol... | [
{
"created": "Sun, 21 Jul 1996 19:22:18 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Morales-Tecotl",
"Hugo A.",
""
],
[
"Urrutia",
"Luis F.",
""
],
[
"Vergara",
"J. David",
""
]
] | We show that the reality conditions to be imposed on Ashtekar variables to recover real gravity can be implemented as second class constraints a la Dirac. Thus, counting gravitational degrees of freedom follows accordingly. Some constraints of the real theory turn out to be non-polynomial, regardless of the form, polyn... |
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