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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0906.4237 | Elias C. Vagenas | M. R. Setare and Elias C. Vagenas | Non-minimal coupling of the phantom field and cosmic acceleration | 9 pages, no figures; (v2) title slightly changed, one reference and
acknowledgments added, no change in physics | Astrophys.Space Sci.330:145-150,2010 | 10.1007/s10509-010-0369-z | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent interest in phantom fields as candidates for the dark
energy component, we investigate the consequences of the phantom field when is
minimally coupled to gravity. In particular, the necessary (but insufficient)
conditions for the acceleration and superacceleration of the universe are
obtained ... | [
{
"created": "Tue, 23 Jun 2009 12:14:56 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2010 18:43:48 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Setare",
"M. R.",
""
],
[
"Vagenas",
"Elias C.",
""
]
] | Motivated by the recent interest in phantom fields as candidates for the dark energy component, we investigate the consequences of the phantom field when is minimally coupled to gravity. In particular, the necessary (but insufficient) conditions for the acceleration and superacceleration of the universe are obtained wh... |
1106.4427 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | Cosmological apparent and trapping horizons | 18 pages, 2 tables, no figures, to appear in Phys. Rev. D | Phys.Rev.D84:024003,2011 | 10.1103/PhysRevD.84.024003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of particle, event, and apparent horizons in FLRW space are
discussed. The apparent horizon is trapping when the Ricci curvature is
positive. This simple criterion coincides with the condition for the
Kodama-Hayward apparent horizon temperature to be positive, and also
discriminates between timelike and ... | [
{
"created": "Wed, 22 Jun 2011 12:09:33 GMT",
"version": "v1"
}
] | 2011-08-08 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | The dynamics of particle, event, and apparent horizons in FLRW space are discussed. The apparent horizon is trapping when the Ricci curvature is positive. This simple criterion coincides with the condition for the Kodama-Hayward apparent horizon temperature to be positive, and also discriminates between timelike and sp... |
2202.00178 | Arianna Renzini | Arianna I. Renzini, Boris Goncharov, Alexander C. Jenkins, Pat M.
Meyers | Stochastic Gravitational-Wave Backgrounds: Current Detection Efforts and
Future Prospects | 71 pages, 14 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The collection of individually resolvable gravitational wave (GW) events
makes up a tiny fraction of all GW signals which reach our detectors, while
most lie below the confusion limit and go undetected. Like voices in a crowded
room, the collection of unresolved signals gives rise to a background which is
well-descri... | [
{
"created": "Tue, 1 Feb 2022 01:25:53 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2022 22:08:11 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Renzini",
"Arianna I.",
""
],
[
"Goncharov",
"Boris",
""
],
[
"Jenkins",
"Alexander C.",
""
],
[
"Meyers",
"Pat M.",
""
]
] | The collection of individually resolvable gravitational wave (GW) events makes up a tiny fraction of all GW signals which reach our detectors, while most lie below the confusion limit and go undetected. Like voices in a crowded room, the collection of unresolved signals gives rise to a background which is well-describe... |
gr-qc/9605024 | Jai-chan Hwang | J. Hwang | Evolution of Structures in Generalized Gravity Theories | 9 pages, revtex, no figures | Class.Quant.Grav.14:1981-1991,1997 | 10.1088/0264-9381/14/7/029 | null | gr-qc | null | A broad class of generalized Einstein's gravity can be cast into Einstein's
gravity with a minimally coupled scalar field using suitable conformal
rescaling of the metric. Using this conformal equivalence between the theories,
we derive the equations for the background and the perturbations, and the
general asymptoti... | [
{
"created": "Sun, 12 May 1996 05:18:58 GMT",
"version": "v1"
}
] | 2011-09-30 | [
[
"Hwang",
"J.",
""
]
] | A broad class of generalized Einstein's gravity can be cast into Einstein's gravity with a minimally coupled scalar field using suitable conformal rescaling of the metric. Using this conformal equivalence between the theories, we derive the equations for the background and the perturbations, and the general asymptotic ... |
1401.3276 | Juan Betancort-Rijo | Juan Betancort-Rijo (1,2) and Felipe Jimenez Ibarra (2) ((1) Instituto
de Astrofisica de Canarias, La Laguna, Tenerife, Spain (2) Departamento de
Astrofisica, Universidad de La Laguna, Tenerife, Spain) | Einstein's first gravitational field equation 101 years latter | null | null | null | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review and strengthen the arguments given by Einstein to derive his first
gravitational field equation for static fields and show that, although it was
ultimately rejected, it follows from General Relativity (GR) for negligible
pressure. Using this equation and considerations folowing directly from the
equivalence... | [
{
"created": "Fri, 10 Jan 2014 18:58:12 GMT",
"version": "v1"
}
] | 2014-01-15 | [
[
"Betancort-Rijo",
"Juan",
""
],
[
"Ibarra",
"Felipe Jimenez",
""
]
] | We review and strengthen the arguments given by Einstein to derive his first gravitational field equation for static fields and show that, although it was ultimately rejected, it follows from General Relativity (GR) for negligible pressure. Using this equation and considerations folowing directly from the equivalence p... |
0704.3184 | Alexander Burinskii | Alexander Burinskii | Kerr-Schild Photonlike Metric Solutions | 6 p, Revtex4 | null | null | null | gr-qc hep-th | null | The charged and spinning lightlike solutions are obtained in the Kerr-Schild
formalism. In particular, one of them may be considered as an ultrarelativistic
boost of the Kerr-Newman solution along the direction of angular momentum. The
Kerr singular ring disappears, however, there remains a finite parameter $a$
which... | [
{
"created": "Tue, 24 Apr 2007 13:01:59 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Apr 2007 11:18:01 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Mar 2008 13:18:54 GMT",
"version": "v3"
}
] | 2008-03-20 | [
[
"Burinskii",
"Alexander",
""
]
] | The charged and spinning lightlike solutions are obtained in the Kerr-Schild formalism. In particular, one of them may be considered as an ultrarelativistic boost of the Kerr-Newman solution along the direction of angular momentum. The Kerr singular ring disappears, however, there remains a finite parameter $a$ which d... |
1611.05337 | Sharmanthie Fernando | Sharmanthie Fernando | Bardeen-de Sitter black holes | 20 pages with 12 figures, Accepted to be published in International
Journal of Modern Physics D | International Journal of Modern Physics D, vol: 26, no: 07,
1750071 (2017) | 10.1142/S0218271817500717 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a regular black hole with a positive cosmological
constant. The regular black hole considered is the well known Bardeen black
hole and it is a solution to the Einstein equations coupled to non-linear
electrodynamics with a magnetic monopole. The paper discuss the properties of
the Bardeen-de ... | [
{
"created": "Wed, 16 Nov 2016 15:55:28 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2016 15:12:34 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Jan 2017 20:32:04 GMT",
"version": "v3"
}
] | 2017-06-15 | [
[
"Fernando",
"Sharmanthie",
""
]
] | In this paper we present a regular black hole with a positive cosmological constant. The regular black hole considered is the well known Bardeen black hole and it is a solution to the Einstein equations coupled to non-linear electrodynamics with a magnetic monopole. The paper discuss the properties of the Bardeen-de Si... |
gr-qc/9805083 | Marek Pawlowski | L. N. Gyngazov, M. Pawlowski, V. N. Pervushin, V. I. Smirichinski | Proper Time Dynamics in General Relativity and Conformal Unified Theory | 20 pages, latex, no figures, submited to General Relativity and
Garvitation | Gen.Rel.Grav.30:1749-1773,1998 | 10.1023/A:1026667111744 | JINR E2-98-114 | gr-qc | null | The paper is devoted to the description a measurable time-interval (``proper
time'') in the Hamiltonian version of general relativity with the Dirac-ADM
metric. To separate the dynamical parameter of evolution from the space metric
we use the Lichnerowicz conformally invariant variables. In terms of these
variables G... | [
{
"created": "Thu, 21 May 1998 13:11:59 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gyngazov",
"L. N.",
""
],
[
"Pawlowski",
"M.",
""
],
[
"Pervushin",
"V. N.",
""
],
[
"Smirichinski",
"V. I.",
""
]
] | The paper is devoted to the description a measurable time-interval (``proper time'') in the Hamiltonian version of general relativity with the Dirac-ADM metric. To separate the dynamical parameter of evolution from the space metric we use the Lichnerowicz conformally invariant variables. In terms of these variables GR ... |
1505.04434 | Joan Sola | Spyros Basilakos, Nick E. Mavromatos and Joan Sola | Starobinsky-like inflation and running vacuum in the context of
Supergravity | Version accepted in Universe | null | null | LCTS/2015-11 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the primeval inflationary phase of the early Universe within a
quantum field theoretical (QFT) framework that can be viewed as the effective
action of vacuum decay in the early times. Interestingly enough, the model
accounts for the "graceful exit" of the inflationary phase into the standard
radiation reg... | [
{
"created": "Sun, 17 May 2015 18:56:31 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2016 13:45:56 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jul 2016 19:29:03 GMT",
"version": "v3"
}
] | 2016-07-22 | [
[
"Basilakos",
"Spyros",
""
],
[
"Mavromatos",
"Nick E.",
""
],
[
"Sola",
"Joan",
""
]
] | We describe the primeval inflationary phase of the early Universe within a quantum field theoretical (QFT) framework that can be viewed as the effective action of vacuum decay in the early times. Interestingly enough, the model accounts for the "graceful exit" of the inflationary phase into the standard radiation regim... |
1411.4735 | Pardyumn Kumar Sahoo | P.K. Sahoo, B. Mishra and S.K. Tripathy | Kaluza-Klein cosmological model in $f(R,T)$ gravity with $\Lambda(T)$ | 10 pages, 9 figures | Indian Journal of Physics, Vol 94(4), 485-493, 2016 | 10.1007/s12648-015-0759-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of Kaluza-Klein cosmological models in $f(R,T)$ theory of gravity
have been investigated. In the work, we have considered the functional $f(R,T)$
to be in the form $f(R,T)=f(R)+f(T)$ with $f(R)=\lambda R$ and $f(T)=\lambda
T$. Such a choice of the functional $f(R,T)$ leads to an evolving effective
cosmologica... | [
{
"created": "Tue, 18 Nov 2014 05:08:55 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2014 05:14:24 GMT",
"version": "v2"
}
] | 2016-07-14 | [
[
"Sahoo",
"P. K.",
""
],
[
"Mishra",
"B.",
""
],
[
"Tripathy",
"S. K.",
""
]
] | A class of Kaluza-Klein cosmological models in $f(R,T)$ theory of gravity have been investigated. In the work, we have considered the functional $f(R,T)$ to be in the form $f(R,T)=f(R)+f(T)$ with $f(R)=\lambda R$ and $f(T)=\lambda T$. Such a choice of the functional $f(R,T)$ leads to an evolving effective cosmological ... |
1607.04070 | Kimet Jusufi | Kimet Jusufi | Quantum Corrected Schwarzschild Thin Shell Wormhole | 8 pages, 4 figures, accepted for publication in EPJC | Eur. Phys. J. C (2016) 76: 608 | 10.1140/epjc/s10052-016-4456-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Ali and Khalil \cite{Farag Ali}, based on the Bohmian quantum
mechanics derived a quantum corrected version of the Schwarzschild metric. In
this paper, we construct a quantum corrected Schwarzschild thin shell wormhole
(QSTSW) and investigate the stability of this wormhole. First we compute the
surface stre... | [
{
"created": "Thu, 14 Jul 2016 10:24:38 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Oct 2016 11:23:49 GMT",
"version": "v2"
}
] | 2016-11-08 | [
[
"Jusufi",
"Kimet",
""
]
] | Recently, Ali and Khalil \cite{Farag Ali}, based on the Bohmian quantum mechanics derived a quantum corrected version of the Schwarzschild metric. In this paper, we construct a quantum corrected Schwarzschild thin shell wormhole (QSTSW) and investigate the stability of this wormhole. First we compute the surface stress... |
2310.08141 | Samuel Blitz | Samuel Blitz and David McNutt | Horizons that Gyre and Gimble: A Differential Characterization of Null
Hypersurfaces | 18 pages, significant changes | null | null | null | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | Motivated by the thermodynamics of black hole solutions conformal to
stationary solutions, we study the geometric invariant theory of null
hypersurfaces. It is well-known that a null hypersurface in a Lorentzian
manifold can be treated as a Carrollian geometry. Additional structure can be
added to this geometry by ch... | [
{
"created": "Thu, 12 Oct 2023 08:55:34 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Mar 2024 10:11:35 GMT",
"version": "v2"
}
] | 2024-03-19 | [
[
"Blitz",
"Samuel",
""
],
[
"McNutt",
"David",
""
]
] | Motivated by the thermodynamics of black hole solutions conformal to stationary solutions, we study the geometric invariant theory of null hypersurfaces. It is well-known that a null hypersurface in a Lorentzian manifold can be treated as a Carrollian geometry. Additional structure can be added to this geometry by choo... |
1703.05316 | S Habib Mazharimousavi | S. Habib Mazharimousavi, Z. Amirabi and M. Halilsoy | Magnetic Morris-Thorne wormhole in 2+1-dimensions | 8 pages, one figure published version | Gen Relativ Gravit 48, 143 (2016) | 10.1007/s10714-016-2139-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of $2+1-$dimensional gravity coupled to a particular nonlinear
electrodynamics (NED), we obtain a class of traversable / Morris-Thorne type
wormhole solutions. The problem is reduced to a single function dependence in
which the shape function acts as generator to the wormholes. The field ansatz
is pure... | [
{
"created": "Wed, 15 Mar 2017 12:49:29 GMT",
"version": "v1"
}
] | 2017-03-17 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Amirabi",
"Z.",
""
],
[
"Halilsoy",
"M.",
""
]
] | In the context of $2+1-$dimensional gravity coupled to a particular nonlinear electrodynamics (NED), we obtain a class of traversable / Morris-Thorne type wormhole solutions. The problem is reduced to a single function dependence in which the shape function acts as generator to the wormholes. The field ansatz is pure m... |
2202.02238 | Yaser Tavakoli | Yaser Tavakoli, Ahad K. Ardabili, Mariam Bouhmadi-L\'opez and Paulo
Vargas Moniz | Role of Gauss-Bonnet corrections in a DGP brane gravitational collapse | 28 pages, 5 figures (version published in PRD) | Phys. Rev. D 105, 084050 (2022) | 10.1103/PhysRevD.105.084050 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | An Oppenheimer-Snyder (OS)-type collapse is considered for a
Dvali-Gabadadze-Porrati (DGP) brane, whereas a Gauss-Bonnet (GB) term is
provided for the bulk. We study the combined effect of the DGP induced gravity
plus the GB curvature, regarding any modification of the general relativistic
OS dynamics. Our paper has ... | [
{
"created": "Fri, 4 Feb 2022 17:16:26 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2022 16:23:13 GMT",
"version": "v2"
}
] | 2022-04-27 | [
[
"Tavakoli",
"Yaser",
""
],
[
"Ardabili",
"Ahad K.",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Moniz",
"Paulo Vargas",
""
]
] | An Oppenheimer-Snyder (OS)-type collapse is considered for a Dvali-Gabadadze-Porrati (DGP) brane, whereas a Gauss-Bonnet (GB) term is provided for the bulk. We study the combined effect of the DGP induced gravity plus the GB curvature, regarding any modification of the general relativistic OS dynamics. Our paper has a ... |
gr-qc/0508029 | Volker Perlick | Volker Perlick | Fermat Principle in Finsler Spacetimes | 18 pages, submitted to Gen. Rel. Grav | Gen.Rel.Grav. 38 (2006) 365-380 | 10.1007/s10714-005-0225-6 | null | gr-qc | null | It is shown that, on a manifold with a Finsler metric of Lorentzian
signature, the lightlike geodesics satisfy the following variational principle.
Among all lightlike curves from a point (emission event) to a timelike curve
(worldline of receiver), the lightlike geodesics make the arrival time
stationary. Here ``arr... | [
{
"created": "Mon, 8 Aug 2005 19:57:34 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Perlick",
"Volker",
""
]
] | It is shown that, on a manifold with a Finsler metric of Lorentzian signature, the lightlike geodesics satisfy the following variational principle. Among all lightlike curves from a point (emission event) to a timelike curve (worldline of receiver), the lightlike geodesics make the arrival time stationary. Here ``arriv... |
gr-qc/0003099 | Eric Chassande-Mottin | E. Chassande-Mottin and S. V. Dhurandhar | Adaptive filtering techniques for gravitational wave interferometric
data: Removing long-term sinusoidal disturbances and oscillatory transients | 16 pages, 9 figures, submitted to Phys. Rev. D | Phys.Rev. D63 (2001) 042004 | 10.1103/PhysRevD.63.042004 | null | gr-qc | null | It is known by the experience gained from the gravitational wave detector
proto-types that the interferometric output signal will be corrupted by a
significant amount of non-Gaussian noise, large part of it being essentially
composed of long-term sinusoids with slowly varying envelope (such as violin
resonances in th... | [
{
"created": "Mon, 27 Mar 2000 17:12:45 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chassande-Mottin",
"E.",
""
],
[
"Dhurandhar",
"S. V.",
""
]
] | It is known by the experience gained from the gravitational wave detector proto-types that the interferometric output signal will be corrupted by a significant amount of non-Gaussian noise, large part of it being essentially composed of long-term sinusoids with slowly varying envelope (such as violin resonances in the ... |
gr-qc/9502009 | Robert C. Myers | TED JACOBSON, GUNGWON KANG and ROBERT C. MYERS | BLACK HOLE ENTROPY IN HIGHER CURVATURE GRAVITY | 18 pages, LaTeX, Based on talks presented at the 16th Annual MRST
Meeting and at the Heat Kernel Techniques and Quantum Gravity Meeting, very
minor corrections made for some typo's in the original version. | null | null | McGill/95--04; UMDGR--95-092 | gr-qc hep-th | null | We discuss some recent results on black hole thermodynamics within the
context of effective gravitational actions including higher-curvature
interactions. Wald's derivation of the First Law demonstrates that black hole
entropy can always be expressed as a local geometric density integrated over a
space-like cross-sec... | [
{
"created": "Thu, 2 Feb 1995 23:22:03 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 1995 19:41:31 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"JACOBSON",
"TED",
""
],
[
"KANG",
"GUNGWON",
""
],
[
"MYERS",
"ROBERT C.",
""
]
] | We discuss some recent results on black hole thermodynamics within the context of effective gravitational actions including higher-curvature interactions. Wald's derivation of the First Law demonstrates that black hole entropy can always be expressed as a local geometric density integrated over a space-like cross-secti... |
2311.07921 | Susobhan Mandal | Susobhan Mandal, Tausif Parvez, S. Shankaranarayanan | From Horndeski action to the Callan-Giddings-Harvey-Strominger model and
beyond | V2: Version accepted in PRD Letters. The title is modified. 34 Pages,
4 figures (including supplementary material) | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The knowledge of what entered black hole (BH) is completely lost as it
evaporates. This contradicts the unitarity principle of quantum mechanics and
is referred to as the information loss paradox. Understanding the end stages of
BH evaporation is key to resolving this paradox. As a first step, we need to
have exact m... | [
{
"created": "Tue, 14 Nov 2023 05:45:25 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2024 13:14:59 GMT",
"version": "v2"
}
] | 2024-01-19 | [
[
"Mandal",
"Susobhan",
""
],
[
"Parvez",
"Tausif",
""
],
[
"Shankaranarayanan",
"S.",
""
]
] | The knowledge of what entered black hole (BH) is completely lost as it evaporates. This contradicts the unitarity principle of quantum mechanics and is referred to as the information loss paradox. Understanding the end stages of BH evaporation is key to resolving this paradox. As a first step, we need to have exact mod... |
0711.0428 | Joseph Samuel | Joseph Samuel and Sutirtha Roy Chowdhury | Geometric flows and black hole entropy | 11 pages, no figures | Class.Quant.Grav.24:F47-F54,2007 | 10.1088/0264-9381/24/11/F01 | null | gr-qc | null | Perelman has given a gradient formulation for the Ricci flow, introducing an
``entropy function'' which increases monotonically along the flow.We pursue a
thermodynamic analogy and apply Ricci flow ideas to general relativity. We
investigate whether Perelman's entropy is related to
(Bekenstein-Hawking)geometric entro... | [
{
"created": "Sat, 3 Nov 2007 05:34:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Samuel",
"Joseph",
""
],
[
"Chowdhury",
"Sutirtha Roy",
""
]
] | Perelman has given a gradient formulation for the Ricci flow, introducing an ``entropy function'' which increases monotonically along the flow.We pursue a thermodynamic analogy and apply Ricci flow ideas to general relativity. We investigate whether Perelman's entropy is related to (Bekenstein-Hawking)geometric entropy... |
1110.6238 | Y. M. Cho | Y. M. Cho and Franklin H. Cho | Knot Topology of Vacuum Space-Time and Vacuum Decomposition of
Einstein's Theory | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Viewing Einstein's theory as the gauge theory of Lorentz group, we construct
the most general vacuum connections which have vanishing curvature tensor and
show that the vacuum space-time can be classified by the knot topology
$\pi_3(S^3)\simeq \pi_3(S^2)$ of $\pi_3(SO(3,1))$. With this we obtain the
gauge independent... | [
{
"created": "Fri, 28 Oct 2011 03:37:12 GMT",
"version": "v1"
}
] | 2011-10-31 | [
[
"Cho",
"Y. M.",
""
],
[
"Cho",
"Franklin H.",
""
]
] | Viewing Einstein's theory as the gauge theory of Lorentz group, we construct the most general vacuum connections which have vanishing curvature tensor and show that the vacuum space-time can be classified by the knot topology $\pi_3(S^3)\simeq \pi_3(S^2)$ of $\pi_3(SO(3,1))$. With this we obtain the gauge independent v... |
2005.05785 | Adriano Barreto | Adriano B. Barreto and Gilberto M. Kremer | Cosmological Solutions for the Geometrical Scalar-Tensor with the
Potential Determined by the Noether Symmetry Approach | 14 pages, 3 figures | Symmetry 2020, 12(7), 1110 | 10.3390/sym12071110 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider a scale-tensor theory in which the space-time is
endowed with a Weyl integrable geometrical structure due to the Palatini
variational method. Since the scalar field has a geometrical nature (related to
non-metricity), the theory is known as \textit{Geometrical Scalar-Tensor}. On
the framework... | [
{
"created": "Tue, 12 May 2020 14:07:12 GMT",
"version": "v1"
}
] | 2020-07-06 | [
[
"Barreto",
"Adriano B.",
""
],
[
"Kremer",
"Gilberto M.",
""
]
] | In this work we consider a scale-tensor theory in which the space-time is endowed with a Weyl integrable geometrical structure due to the Palatini variational method. Since the scalar field has a geometrical nature (related to non-metricity), the theory is known as \textit{Geometrical Scalar-Tensor}. On the framework o... |
1307.5461 | Florian Girelli | Maite Dupuis, Florian Girelli | Quantum hyperbolic geometry in loop quantum gravity with cosmological
constant | 6pages, 1 figure | null | 10.1103/PhysRevD.87.121502 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop Quantum Gravity (LQG) is an attempt to describe the quantum gravity
regime. Introducing a non-zero cosmological constant $\Lambda$ in this context
has been a withstanding problem. Other approaches, such as Chern-Simons
gravity, suggest that quantum groups can be used to introduce $\Lambda$ in the
game. Not much ... | [
{
"created": "Sat, 20 Jul 2013 20:57:13 GMT",
"version": "v1"
}
] | 2013-07-24 | [
[
"Dupuis",
"Maite",
""
],
[
"Girelli",
"Florian",
""
]
] | Loop Quantum Gravity (LQG) is an attempt to describe the quantum gravity regime. Introducing a non-zero cosmological constant $\Lambda$ in this context has been a withstanding problem. Other approaches, such as Chern-Simons gravity, suggest that quantum groups can be used to introduce $\Lambda$ in the game. Not much is... |
gr-qc/0305072 | Vishnu Jejjala | Vishnu Jejjala, Robert G. Leigh, Djordje Minic | Deconstructing the Cosmological Constant | Fourth Prize, 2003 Gravity Research Foundation Essay Contest; 7
pages, LaTeX | Gen.Rel.Grav. 35 (2003) 2089-2095 | 10.1023/A:1027337303968 | VPI-IPPAP-03-07, CERN-TH/2003-109 | gr-qc hep-ph hep-th | null | Deconstruction provides a novel way of dealing with the notoriously difficult
ultraviolet problems of four-dimensional gravity. This approach also naturally
leads to a new perspective on the holographic principle, tying it to the
fundamental requirements of unitarity and diffeomorphism invariance, as well as
to a new... | [
{
"created": "Mon, 19 May 2003 20:20:50 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Jejjala",
"Vishnu",
""
],
[
"Leigh",
"Robert G.",
""
],
[
"Minic",
"Djordje",
""
]
] | Deconstruction provides a novel way of dealing with the notoriously difficult ultraviolet problems of four-dimensional gravity. This approach also naturally leads to a new perspective on the holographic principle, tying it to the fundamental requirements of unitarity and diffeomorphism invariance, as well as to a new v... |
gr-qc/9805092 | null | A. Dobado and A.L. Maroto | Non-local gravitational effective action and particle production | 8 pages, Latex. Contribution to the Proceedings of the International
Seminar on Mathematical Cosmology, Potsdam (Germany), March 30 - April 4,
1998 | null | null | FT-UCM/10-98 | gr-qc | null | We study the effective action for gravity obtained after the integration of
scalar matter fields, using the local momentum representation based on the
Riemann normal coordinates expansion. By considering this expansion around
different space-time points, we also compute the non-local terms together with
the more usua... | [
{
"created": "Tue, 26 May 1998 15:21:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dobado",
"A.",
""
],
[
"Maroto",
"A. L.",
""
]
] | We study the effective action for gravity obtained after the integration of scalar matter fields, using the local momentum representation based on the Riemann normal coordinates expansion. By considering this expansion around different space-time points, we also compute the non-local terms together with the more usual ... |
gr-qc/9805056 | null | M. Brunetti, E. Coccia, V. Fafone, F. Fucito | Gravitational Wave Radiation from Compact Binary Systems in the
Jordan-Brans-Dicke Theory | 24 pages, 3 figures, some references added with comments | Phys.Rev. D59 (1999) 044027 | 10.1103/PhysRevD.59.044027 | ROM2F/98/11 | gr-qc astro-ph hep-th | null | In this paper we analyze the signal emitted by a compact binary system in the
Jordan-Brans-Dicke theory. We compute the scalar and tensor components of the
power radiated by the source and study the scalar waveform. Eventually we
consider the detectability of the scalar component of the radiation by
interferometers a... | [
{
"created": "Thu, 14 May 1998 08:12:50 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 1998 07:54:42 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Brunetti",
"M.",
""
],
[
"Coccia",
"E.",
""
],
[
"Fafone",
"V.",
""
],
[
"Fucito",
"F.",
""
]
] | In this paper we analyze the signal emitted by a compact binary system in the Jordan-Brans-Dicke theory. We compute the scalar and tensor components of the power radiated by the source and study the scalar waveform. Eventually we consider the detectability of the scalar component of the radiation by interferometers and... |
2104.14318 | Sergi Nadal-Gisbert | Antonio Ferreiro, Sergi Nadal-Gisbert and Jos\'e Navarro-Salas | Renormalization, running couplings and decoupling for the Yukawa model
in curved spacetime | New references and comments added | Phys. Rev. D 104, 025003 (2021) | 10.1103/PhysRevD.104.025003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decoupling of heavy fields as required by the Appelquist-Carazzone
theorem plays a fundamental role in the construction of any effective field
theory. However, it is not a trivial task to implement a renormalization
prescription that produces the expected decoupling of massive fields, and it is
even more difficul... | [
{
"created": "Thu, 29 Apr 2021 13:04:42 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Apr 2021 08:42:27 GMT",
"version": "v2"
},
{
"created": "Wed, 5 May 2021 08:59:53 GMT",
"version": "v3"
}
] | 2021-07-07 | [
[
"Ferreiro",
"Antonio",
""
],
[
"Nadal-Gisbert",
"Sergi",
""
],
[
"Navarro-Salas",
"José",
""
]
] | The decoupling of heavy fields as required by the Appelquist-Carazzone theorem plays a fundamental role in the construction of any effective field theory. However, it is not a trivial task to implement a renormalization prescription that produces the expected decoupling of massive fields, and it is even more difficult ... |
2404.15948 | Abhishek Chowdhury | Abhishek Chowdhury | Warp Drives and Martel-Poisson charts | 9 pages | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We extend the construction of the Alcubierre-Natario class of warp drives to
an infinite class of spacetimes with similar properties. This is achieved by
utilising the Martel-Poisson charts which closely resemble the Weak
Painleve-Gullstrand form for various background metrics (Mink, AdS, dS). The
highlight of this c... | [
{
"created": "Wed, 24 Apr 2024 16:09:44 GMT",
"version": "v1"
}
] | 2024-04-25 | [
[
"Chowdhury",
"Abhishek",
""
]
] | We extend the construction of the Alcubierre-Natario class of warp drives to an infinite class of spacetimes with similar properties. This is achieved by utilising the Martel-Poisson charts which closely resemble the Weak Painleve-Gullstrand form for various background metrics (Mink, AdS, dS). The highlight of this con... |
gr-qc/9908063 | Mauricio Bellini | Mauricio Bellini (Departamento de Fisica, Fac. de Cs. Exactas y Nat.,
Universidad Nacional de Mar del Plata) | Primordial fluctuations in the warm inflation scenario with a more
realistic coarse - grained field | 11 pages, no figures (revtex file) | Nucl.Phys. B563 (1999) 245-258 | 10.1016/S0550-3213(99)00537-4 | null | gr-qc | null | I study a semiclassical approach to warm inflation scenario introduced in
previous works. In this work, I define the fluctuations for the matter field by
means of a new coarse - grained field with a suppression factor G. This field
describes the matter field fluctuations on the now observable scale of the
universe. T... | [
{
"created": "Tue, 24 Aug 1999 21:19:27 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 1999 19:00:31 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jan 2000 22:09:19 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Bellini",
"Mauricio",
"",
"Departamento de Fisica, Fac. de Cs. Exactas y Nat.,\n Universidad Nacional de Mar del Plata"
]
] | I study a semiclassical approach to warm inflation scenario introduced in previous works. In this work, I define the fluctuations for the matter field by means of a new coarse - grained field with a suppression factor G. This field describes the matter field fluctuations on the now observable scale of the universe. The... |
2309.17404 | Nicholas Loutrel | Nicholas Loutrel, Richard Brito, Andrea Maselli, Paolo Pani | Relevance of Precession for Tests of the Black Hole No Hair Theorems | 14 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The multipole moments of black holes in general relativity obey certain
consistency relations known as the no-hair theorems. The details of this
multipolar structure are imprinted into the gravitational waves emitted by
binary black holes, particularly if the binary is precessing. If black holes do
not obey the vacuu... | [
{
"created": "Fri, 29 Sep 2023 17:04:07 GMT",
"version": "v1"
}
] | 2023-10-02 | [
[
"Loutrel",
"Nicholas",
""
],
[
"Brito",
"Richard",
""
],
[
"Maselli",
"Andrea",
""
],
[
"Pani",
"Paolo",
""
]
] | The multipole moments of black holes in general relativity obey certain consistency relations known as the no-hair theorems. The details of this multipolar structure are imprinted into the gravitational waves emitted by binary black holes, particularly if the binary is precessing. If black holes do not obey the vacuum ... |
1704.03232 | Runqiu Yang | Shan-Ming Ruan and Run-Qiu Yang | Comments on Joint Terms in Gravitational Action | Published version with little modifications compared with previous
one | Class. Quantum Grav. 34 (2017) 175017 (18pp) | 10.1088/1361-6382/aa8053 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper compares three different methods about computing joint terms in
on-shell action of gravity, which are identifying the joint term by the
variational principle in Dirichlet boundary condition, treating the joint term
as the limit contribution of smooth boundary and finding the joint term by
local SO(1,$d-1$)... | [
{
"created": "Tue, 11 Apr 2017 10:36:39 GMT",
"version": "v1"
},
{
"created": "Thu, 4 May 2017 03:54:02 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Aug 2017 13:46:25 GMT",
"version": "v3"
}
] | 2017-08-17 | [
[
"Ruan",
"Shan-Ming",
""
],
[
"Yang",
"Run-Qiu",
""
]
] | This paper compares three different methods about computing joint terms in on-shell action of gravity, which are identifying the joint term by the variational principle in Dirichlet boundary condition, treating the joint term as the limit contribution of smooth boundary and finding the joint term by local SO(1,$d-1$) t... |
0903.1122 | Chad Galley | Chad R. Galley and Manuel Tiglio | Radiation reaction and gravitational waves in the effective field theory
approach | 23 pages, 8 figures | Phys.Rev.D79:124027,2009 | 10.1103/PhysRevD.79.124027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the contribution to the Lagrangian from the leading order (2.5
post-Newtonian) radiation reaction and the quadrupolar gravitational waves
emitted from a binary system using the effective field theory (EFT) approach of
Goldberger and Rothstein. We use an initial value formulation of the underlying
(quantum)... | [
{
"created": "Thu, 5 Mar 2009 22:27:39 GMT",
"version": "v1"
}
] | 2010-04-14 | [
[
"Galley",
"Chad R.",
""
],
[
"Tiglio",
"Manuel",
""
]
] | We compute the contribution to the Lagrangian from the leading order (2.5 post-Newtonian) radiation reaction and the quadrupolar gravitational waves emitted from a binary system using the effective field theory (EFT) approach of Goldberger and Rothstein. We use an initial value formulation of the underlying (quantum) f... |
0709.1625 | Mairi Sakellariadou | William Nelson and Mairi Sakellariadou (King's College, University of
London, U.K.) | On the possibility of Dark Energy from corrections to the Wheeler-De
Witt equation | 4 pages, 1 figure. Minor modifications to match version to appear in
Phys. Let. B | Phys.Lett.B661:37-41,2008 | 10.1016/j.physletb.2008.01.060 | null | gr-qc astro-ph hep-ph hep-th | null | We present a method for approximating the effective consequence of generic
quantum gravity corrections to the Wheeler-DeWitt equation. We show that in
many cases these corrections can produce departures from classical physics at
large scales and that this behaviour can be interpreted as additional matter
components. ... | [
{
"created": "Tue, 11 Sep 2007 13:50:18 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2008 07:23:42 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nelson",
"William",
"",
"King's College, University of\n London, U.K."
],
[
"Sakellariadou",
"Mairi",
"",
"King's College, University of\n London, U.K."
]
] | We present a method for approximating the effective consequence of generic quantum gravity corrections to the Wheeler-DeWitt equation. We show that in many cases these corrections can produce departures from classical physics at large scales and that this behaviour can be interpreted as additional matter components. Th... |
1812.06151 | David Benisty | David Benisty, Eduardo Guendelman, Zbigniew Haba | Unification of DE-DM from Diffusive Cosmology | Accepted for publishing in Phys. Rev. D | Phys. Rev. D 99, 123521 (2019) | 10.1103/PhysRevD.99.123521 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generalized ideas of unified dark matter and dark energy in the context of
dynamical space time theories with a diffusive transfer of energy are studied.
The dynamical space-time theories are introduced a vector field whose equation
of motion guarantees a conservation of a certain Energy Momentum tensor, which
may be... | [
{
"created": "Fri, 14 Dec 2018 20:15:55 GMT",
"version": "v1"
},
{
"created": "Wed, 29 May 2019 22:52:21 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Benisty",
"David",
""
],
[
"Guendelman",
"Eduardo",
""
],
[
"Haba",
"Zbigniew",
""
]
] | Generalized ideas of unified dark matter and dark energy in the context of dynamical space time theories with a diffusive transfer of energy are studied. The dynamical space-time theories are introduced a vector field whose equation of motion guarantees a conservation of a certain Energy Momentum tensor, which may be r... |
gr-qc/9406019 | null | A. Connes and C. Rovelli | Von Neumann Algebra Automorphisms and Time-Thermodynamics Relation in
General Covariant Quantum Theories | 25 pages, LaTex | Class.Quant.Grav.11:2899-2918,1994 | 10.1088/0264-9381/11/12/007 | null | gr-qc | null | We consider the cluster of problems raised by the relation between the notion
of time, gravitational theory, quantum theory and thermodynamics; in
particular, we address the problem of relating the "timelessness" of the
hypothetical fundamental general covariant quantum field theory with the
"evidence" of the flow of... | [
{
"created": "Tue, 14 Jun 1994 09:15:26 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Connes",
"A.",
""
],
[
"Rovelli",
"C.",
""
]
] | We consider the cluster of problems raised by the relation between the notion of time, gravitational theory, quantum theory and thermodynamics; in particular, we address the problem of relating the "timelessness" of the hypothetical fundamental general covariant quantum field theory with the "evidence" of the flow of t... |
1706.04287 | Y. Jack Ng | Y. Jack Ng | Effective Cosmological Constant and Dark Energy | 12 pages, to appear in Proc. BASIC 2017 Conference; a large part of
section 5 (addendum) is taken from "Modified Dark Matter: Relating Dark
Energy, Dark Matter and Baryonic Matter" by D. Edmonds et al. (in
preparation) | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two very different methods are used to estimate the magnitude of the
effective cosmological constant / dark energy (for the present cosmic epoch).
Their results agree with each other and are in agreement with observations. One
method makes use of unimodular gravity and causal set theory, while the other
one employs a... | [
{
"created": "Wed, 14 Jun 2017 00:19:57 GMT",
"version": "v1"
}
] | 2017-06-15 | [
[
"Ng",
"Y. Jack",
""
]
] | Two very different methods are used to estimate the magnitude of the effective cosmological constant / dark energy (for the present cosmic epoch). Their results agree with each other and are in agreement with observations. One method makes use of unimodular gravity and causal set theory, while the other one employs arg... |
gr-qc/0606122 | Juan Pablo Beltr\'an Almeida jalmeida | R. Aldrovandi, J. P. Beltran Almeida and J. G. Pereira | de Sitter special relativity | V2: Some presentation changes; a new section introduced, with a
discussion about possible phenomenological consequences; new references
added; version to be published in Classical and Quantum Gravity | Class.Quant.Grav.24:1385-1404,2007 | 10.1088/0264-9381/24/6/002 | null | gr-qc hep-th | null | A special relativity based on the de Sitter group is introduced, which is the
theory that might hold up in the presence of a non-vanishing cosmological
constant. Like ordinary special relativity, it retains the quotient character
of spacetime, and a notion of homogeneity. As a consequence, the underlying
spacetime wi... | [
{
"created": "Wed, 28 Jun 2006 20:38:20 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2007 12:26:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Aldrovandi",
"R.",
""
],
[
"Almeida",
"J. P. Beltran",
""
],
[
"Pereira",
"J. G.",
""
]
] | A special relativity based on the de Sitter group is introduced, which is the theory that might hold up in the presence of a non-vanishing cosmological constant. Like ordinary special relativity, it retains the quotient character of spacetime, and a notion of homogeneity. As a consequence, the underlying spacetime will... |
0711.4897 | Cl\'audio Nassif Cruz | Claudio Nassif | Deformed special relativity with an invariant minimum speed and its
cosmological implications | 7 pages, 3 figures. arXiv admin note: substantial text overlap with
arXiv:0705.4315, arXiv:0709.1727 | Pramana Journal of Physics, Vol.71, No.1, p.1-13 (2008);
correlated paper in:
http://www.worldscientific.com/worldscinet/ijmpd?journalTabs=read | 10.1007/s12043-008-0136-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper aims to introduce a new symmetry principle in the space-time
geometry through the elimination of the classical idea of rest and by including
a universal minimum limit of speed in the subatomic world. Such a limit,
unattainable by particles, represents a preferred reference frame associated
with a universal ... | [
{
"created": "Fri, 30 Nov 2007 10:14:14 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Dec 2007 22:58:36 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Feb 2008 17:55:51 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Feb 2008 12:49:10 GMT",
"version": "v4"
},
{
"cr... | 2016-11-08 | [
[
"Nassif",
"Claudio",
""
]
] | The paper aims to introduce a new symmetry principle in the space-time geometry through the elimination of the classical idea of rest and by including a universal minimum limit of speed in the subatomic world. Such a limit, unattainable by particles, represents a preferred reference frame associated with a universal ba... |
1205.6012 | Andres Anabalon | Andres Anabalon and Julio Oliva | Exact Hairy Black Holes and their Modification to the Universal Law of
Gravitation | Two new references, 10 pages, 2 figures | null | 10.1103/PhysRevD.86.107501 | null | gr-qc astro-ph.CO astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper two things are done. First, it is pointed out the existence of
exact asymptotically flat, spherically symmetric black holes when a self
interacting, minimally coupled scalar field is the source of the energy
momentum of the Einstein equations in four dimensions. The scalar field
potential is the recentl... | [
{
"created": "Mon, 28 May 2012 01:06:11 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jun 2012 16:49:10 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Anabalon",
"Andres",
""
],
[
"Oliva",
"Julio",
""
]
] | In this paper two things are done. First, it is pointed out the existence of exact asymptotically flat, spherically symmetric black holes when a self interacting, minimally coupled scalar field is the source of the energy momentum of the Einstein equations in four dimensions. The scalar field potential is the recently ... |
2310.12237 | Reyhan Kaya | Reyhan Kaya, Hasan Tuncay \"Oz\c{c}elik | Self-interacting scalar field in (2+1) dimensions Einstein gravity with
torsion | 17 pages, 25 figures | Eur. Phys. J. C 84 (2024) 528 | 10.1140/epjc/s10052-024-12912-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a massless real self-interacting scalar field $\varphi$
non-minimally coupled to Einstein gravity with torsion in (2+1) space-time
dimensions in the presence of cosmological constant. The field equations with a
self-interaction potential $V(\varphi)$ including $\varphi^{n}$ terms are
derived by a variational... | [
{
"created": "Wed, 18 Oct 2023 18:22:57 GMT",
"version": "v1"
}
] | 2024-05-28 | [
[
"Kaya",
"Reyhan",
""
],
[
"Özçelik",
"Hasan Tuncay",
""
]
] | We study a massless real self-interacting scalar field $\varphi$ non-minimally coupled to Einstein gravity with torsion in (2+1) space-time dimensions in the presence of cosmological constant. The field equations with a self-interaction potential $V(\varphi)$ including $\varphi^{n}$ terms are derived by a variational p... |
1004.3200 | Rudranil Basu | Rudranil Basu, Ayan Chatterjee and Amit Ghosh | Local symmetries of non-expanding horizons | 4 pages, revtex4, no figure. Few typos corrected | null | 10.1088/0264-9381/29/23/235010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Local symmetries of a non-expanding horizon has been investigated in the 1st
order formulation of gravity. When applied to a spherically symmetric isolated
horizon only a U(1) subgroup of the Lorentz group survives as residual local
symmetry that one can make use of in constructing an effective theory on the
horizon.... | [
{
"created": "Mon, 19 Apr 2010 14:07:11 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 2010 11:19:09 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Basu",
"Rudranil",
""
],
[
"Chatterjee",
"Ayan",
""
],
[
"Ghosh",
"Amit",
""
]
] | Local symmetries of a non-expanding horizon has been investigated in the 1st order formulation of gravity. When applied to a spherically symmetric isolated horizon only a U(1) subgroup of the Lorentz group survives as residual local symmetry that one can make use of in constructing an effective theory on the horizon. |
gr-qc/0403110 | Salvatore Antoci | S. Antoci | Proposal for an Interpretation of the Hermitian Theory of Relativity | 13 pages, corrected misprint | Gen.Rel.Grav. 19 (1987) 665-679 | null | null | gr-qc astro-ph | null | The equilibrium conditions for charges and currents, apparent in exact
solutions of the field equations, lead one to regard the Hermitian theory of
relativity as the theory of a field endowed with two sources: electromagnetic
and colour four-currents.
| [
{
"created": "Mon, 29 Mar 2004 14:55:54 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 2004 18:12:45 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Antoci",
"S.",
""
]
] | The equilibrium conditions for charges and currents, apparent in exact solutions of the field equations, lead one to regard the Hermitian theory of relativity as the theory of a field endowed with two sources: electromagnetic and colour four-currents. |
0911.5419 | Alexander Petrov Nikolaevich | A.N.Petrov | On creating mass/matter by extra dimensions in the Einstein-Gauss-Bonnet
gravity | 15 pages, no figures, minor changes related to the Journal
publication with adding two references in footnotes | Grav.Cosmol.16:34-41,2010 | 10.1134/S0202289310010056 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | Kaluza-Klein (KK) black hole solutions in the Einstein-Gauss-Bonnet (EGB)
gravity in $D$ dimensions obtained in the current series of the works by Maeda,
Dadhich and Molina are examined. Interpreting their solutions, the authors
claim that the mass/matter is created by the extra dimensions. To support this
claim, one... | [
{
"created": "Sat, 28 Nov 2009 19:27:39 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Oct 2010 12:25:46 GMT",
"version": "v2"
}
] | 2010-10-19 | [
[
"Petrov",
"A. N.",
""
]
] | Kaluza-Klein (KK) black hole solutions in the Einstein-Gauss-Bonnet (EGB) gravity in $D$ dimensions obtained in the current series of the works by Maeda, Dadhich and Molina are examined. Interpreting their solutions, the authors claim that the mass/matter is created by the extra dimensions. To support this claim, one n... |
gr-qc/9712090 | Sibel Baskal | S. Baskal (Dept. of Physics, Middle East Technical University) | Radiation in Yang-Mills formulation of gravity and a generalized pp-wave
metric | 5 pages; e mail: baskal@newton.physics.metu.edu.tr | Prog.Theor.Phys.102:803-807,1999 | 10.1143/PTP.102.803 | null | gr-qc | null | The variational methods implemented on a quadratic Yang-Mills type Lagrangian
yield two sets of equations interpreted as the field equations and the
energy-momentum tensor for the gravitational field. A covariant condition is
imposed on the energy-momentum tensor to represent the radiation field. A
generalized pp-wav... | [
{
"created": "Tue, 23 Dec 1997 17:58:53 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Baskal",
"S.",
"",
"Dept. of Physics, Middle East Technical University"
]
] | The variational methods implemented on a quadratic Yang-Mills type Lagrangian yield two sets of equations interpreted as the field equations and the energy-momentum tensor for the gravitational field. A covariant condition is imposed on the energy-momentum tensor to represent the radiation field. A generalized pp-wave ... |
0905.1501 | Valentin Bonzom | Valentin Bonzom | Spin foam models for quantum gravity from lattice path integrals | 19 pages, 1 figure | Phys. Rev. D80:064028, 2009 | 10.1103/PhysRevD.80.064028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin foam models for quantum gravity are derived from lattice path integrals.
The setting involves variables from both lattice BF theory and Regge calculus.
The action consists in a Regge action, which depends on areas, dihedral angles
and includes the Immirzi parameter. In addition, a measure is inserted to
ensure a... | [
{
"created": "Sun, 10 May 2009 19:50:20 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 2009 08:58:20 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Bonzom",
"Valentin",
""
]
] | Spin foam models for quantum gravity are derived from lattice path integrals. The setting involves variables from both lattice BF theory and Regge calculus. The action consists in a Regge action, which depends on areas, dihedral angles and includes the Immirzi parameter. In addition, a measure is inserted to ensure a c... |
1903.00265 | Guillermo A. Mena Marugan | Alejandro Garc\'ia-Quismondo and Guillermo A. Mena Marug\'an | The Martin-Benito-Mena Marugan-Olmedo prescription for the
Dapor-Liegener model of Loop Quantum Cosmology | 15 pages, published in Physical Review D | Phys. Rev. D 99, 083505 (2019) | 10.1103/PhysRevD.99.083505 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, an alternative Hamiltonian constraint for Loop Quantum Cosmology
has been put forward by Dapor and Liegener, inspired by previous work on
regularization due to Thiemann. Here, we quantize this Hamiltonian following a
prescription for cosmology proposed by Mart\'{\i}n-Benito, Mena Marug\'an, and
Olmedo. To t... | [
{
"created": "Fri, 1 Mar 2019 12:28:31 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2019 10:02:21 GMT",
"version": "v2"
}
] | 2019-05-15 | [
[
"García-Quismondo",
"Alejandro",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
]
] | Recently, an alternative Hamiltonian constraint for Loop Quantum Cosmology has been put forward by Dapor and Liegener, inspired by previous work on regularization due to Thiemann. Here, we quantize this Hamiltonian following a prescription for cosmology proposed by Mart\'{\i}n-Benito, Mena Marug\'an, and Olmedo. To thi... |
2212.04657 | Michael LaHaye | Michael LaHaye, Huan Yang, B\'eatrice Bonga, and Zhenwei Lyu | Efficient fully precessing gravitational waveforms for binaries with
neutron stars | Corrected minor typos and a typo in Fig 9 resulting in the incorrect
placement in the images | null | 10.1103/PhysRevD.108.043018 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We construct an efficient frequency domain waveform for generic circular
compact object binaries that include neutron stars. The orbital precession is
solved on the radiation reaction timescale (and then transformed to the
frequency domain), which is used to map the non-precessional waveform from the
source frame of ... | [
{
"created": "Fri, 9 Dec 2022 03:58:45 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2022 04:49:59 GMT",
"version": "v2"
}
] | 2023-08-28 | [
[
"LaHaye",
"Michael",
""
],
[
"Yang",
"Huan",
""
],
[
"Bonga",
"Béatrice",
""
],
[
"Lyu",
"Zhenwei",
""
]
] | We construct an efficient frequency domain waveform for generic circular compact object binaries that include neutron stars. The orbital precession is solved on the radiation reaction timescale (and then transformed to the frequency domain), which is used to map the non-precessional waveform from the source frame of th... |
1601.00838 | Cosimo Bambi | Jiachen Jiang, Cosimo Bambi, James F. Steiner | Testing the Kerr nature of black hole candidates using iron line
reverberation mapping in the CPR framework | 10 pages, 6 figures. v2: refereed version | Phys. Rev. D 93, 123008 (2016) | 10.1103/PhysRevD.93.123008 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The iron K$\alpha$ line commonly observed in the X-ray spectrum of black hole
candidates is produced by X-ray fluorescence of the inner accretion disk. This
line can potentially be quite a powerful tool to probe the spacetime geometry
around these objects and test the Kerr black hole hypothesis. In a previous
paper, ... | [
{
"created": "Tue, 5 Jan 2016 14:30:09 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2016 04:13:49 GMT",
"version": "v2"
}
] | 2016-06-17 | [
[
"Jiang",
"Jiachen",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Steiner",
"James F.",
""
]
] | The iron K$\alpha$ line commonly observed in the X-ray spectrum of black hole candidates is produced by X-ray fluorescence of the inner accretion disk. This line can potentially be quite a powerful tool to probe the spacetime geometry around these objects and test the Kerr black hole hypothesis. In a previous paper, we... |
gr-qc/9212003 | null | Carl H. Brans and Duane Randall | Exotic Differentiable Structures and General Relativity | 11 pages, LaTeX | null | 10.1007/BF00758828 | null | gr-qc | null | We review recent developments in differential topology with special concern
for their possible significance to physical theories, especially general
relativity. In particular we are concerned here with the discovery of the
existence of non-standard (``fake'' or ``exotic'') differentiable structures on
topologically s... | [
{
"created": "Thu, 3 Dec 1992 19:59:17 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Brans",
"Carl H.",
""
],
[
"Randall",
"Duane",
""
]
] | We review recent developments in differential topology with special concern for their possible significance to physical theories, especially general relativity. In particular we are concerned here with the discovery of the existence of non-standard (``fake'' or ``exotic'') differentiable structures on topologically sim... |
gr-qc/0501046 | Eran Rosenthal | Eran Rosenthal | Regularization of second-order scalar perturbation produced by a
point-particle with a nonlinear coupling | 14 pages | Class.Quant.Grav. 22 (2005) S859 | 10.1088/0264-9381/22/15/013 | null | gr-qc | null | Accurate calculation of the motion of a compact object in a background
spacetime induced by a supermassive black hole is required for the future
detection of such binary systems by the gravitational-wave detector LISA.
Reaching the desired accuracy requires calculation of the second-order
gravitational perturbations ... | [
{
"created": "Thu, 13 Jan 2005 23:34:28 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Rosenthal",
"Eran",
""
]
] | Accurate calculation of the motion of a compact object in a background spacetime induced by a supermassive black hole is required for the future detection of such binary systems by the gravitational-wave detector LISA. Reaching the desired accuracy requires calculation of the second-order gravitational perturbations pr... |
gr-qc/0212095 | Robert van den Hoogen | R. J. van den Hoogen and J. Ibanez | Bianchi II Brane-world Cosmologies (${\cal U}\geq 0$) | 30 pages, 28 eps figures, Revtex | Phys.Rev. D67 (2003) 083510 | 10.1103/PhysRevD.67.083510 | null | gr-qc | null | The asymptotic properties of the Bianchi type II cosmological model in the
Brane-world scenario are investigated. The matter content is assumed to be a
combination of a perfect fluid and a minimimally coupled scalar field that is
restricted to the Brane. The isotropic braneworld solution is determined to
represent th... | [
{
"created": "Mon, 23 Dec 2002 15:29:02 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hoogen",
"R. J. van den",
""
],
[
"Ibanez",
"J.",
""
]
] | The asymptotic properties of the Bianchi type II cosmological model in the Brane-world scenario are investigated. The matter content is assumed to be a combination of a perfect fluid and a minimimally coupled scalar field that is restricted to the Brane. The isotropic braneworld solution is determined to represent the ... |
1511.08740 | A. N. Ivanov | A. N. Ivanov and M. Wellenzohn | Effective Low-Energy Potential for Slow Dirac Fermions in
Einstein-Cartan Gravity with Torsion and Chameleon | 16 pages, no figures, the paper is accepted for publication in
Physical Review D | null | 10.1103/PhysRevD.92.125004 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the most general effective low-energy potential to order O(1/m) for
slow Dirac fermions with mass m, coupled to gravitational, chameleon and
torsion fields in the Einstein-Cartan gravity. The obtained results can be
applied to the experimental analysis of gravitational, chameleon and torsion
interactions in... | [
{
"created": "Tue, 24 Nov 2015 10:41:14 GMT",
"version": "v1"
}
] | 2016-01-20 | [
[
"Ivanov",
"A. N.",
""
],
[
"Wellenzohn",
"M.",
""
]
] | We derive the most general effective low-energy potential to order O(1/m) for slow Dirac fermions with mass m, coupled to gravitational, chameleon and torsion fields in the Einstein-Cartan gravity. The obtained results can be applied to the experimental analysis of gravitational, chameleon and torsion interactions in t... |
2407.16992 | Jungjai Lee | Yongjun Yun and Jungjai Lee | Holographic Dark Energy with Torsion | 11 pages, No figures, to be published in JKPS | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider the holographic dark energy model with axial torsion which
satisfy the cosmological principle. Subsequently, by using the torsional
analogues of Friedmann equations for the new equation from Einstein-Cartan
gravity theory, we obtain the equation of state for dark energy in this model.
We find that the ext... | [
{
"created": "Wed, 24 Jul 2024 04:24:27 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2024 06:25:46 GMT",
"version": "v2"
}
] | 2024-07-26 | [
[
"Yun",
"Yongjun",
""
],
[
"Lee",
"Jungjai",
""
]
] | We consider the holographic dark energy model with axial torsion which satisfy the cosmological principle. Subsequently, by using the torsional analogues of Friedmann equations for the new equation from Einstein-Cartan gravity theory, we obtain the equation of state for dark energy in this model. We find that the exten... |
1108.1178 | Daniele Oriti | Aristide Baratin and Daniele Oriti | Quantum simplicial geometry in the group field theory formalism:
reconsidering the Barrett-Crane model | revtex, 24 pages | New J.Phys. 13 (2011) 125011 | 10.1088/1367-2630/13/12/125011 | LPT-ORSAY 11-121 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A dual formulation of group field theories, obtained by a Fourier transform
mapping functions on a group to functions on its Lie algebra, has been proposed
recently. In the case of the Ooguri model for SO(4) BF theory, the variables of
the dual field variables are thus so(4) bivectors, which have a direct
interpretat... | [
{
"created": "Thu, 4 Aug 2011 19:48:32 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Nov 2011 22:41:02 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Baratin",
"Aristide",
""
],
[
"Oriti",
"Daniele",
""
]
] | A dual formulation of group field theories, obtained by a Fourier transform mapping functions on a group to functions on its Lie algebra, has been proposed recently. In the case of the Ooguri model for SO(4) BF theory, the variables of the dual field variables are thus so(4) bivectors, which have a direct interpretatio... |
2307.10464 | Michail Chabanov | Michail Chabanov and Luciano Rezzolla | Impact of bulk viscosity on the post-merger gravitational-wave signal
from merging neutron stars | 8 pages, 2 figures | null | null | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the violent post-merger of binary neutron-star mergers strong oscillations
are present that impact the emitted gravitational-wave (GW) signal. The
frequencies, temperatures and densities involved in these oscillations allow
for violations of the chemical equilibrium promoted by weak-interactions, thus
leading to a... | [
{
"created": "Wed, 19 Jul 2023 21:22:51 GMT",
"version": "v1"
}
] | 2023-07-21 | [
[
"Chabanov",
"Michail",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | In the violent post-merger of binary neutron-star mergers strong oscillations are present that impact the emitted gravitational-wave (GW) signal. The frequencies, temperatures and densities involved in these oscillations allow for violations of the chemical equilibrium promoted by weak-interactions, thus leading to a n... |
1011.5475 | Reiner Birkl | Reiner Birkl, Nikolaos Stergioulas, Ewald M\"uller | Stationary, Axisymmetric Neutron Stars with Meridional Circulation in
General Relativity | null | Phys.Rev.D84:023003,2011 | 10.1103/PhysRevD.84.023003 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first stationary, axisymmetric neutron star models with
meridional circulation in general relativity. For that purpose, we developed
GRNS, a new code based on a fixed point iteration. We find a two-dimensional
set of meridional circulation modes, which differ by the number of vortices in
the stream lin... | [
{
"created": "Wed, 24 Nov 2010 20:00:22 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Birkl",
"Reiner",
""
],
[
"Stergioulas",
"Nikolaos",
""
],
[
"Müller",
"Ewald",
""
]
] | We present the first stationary, axisymmetric neutron star models with meridional circulation in general relativity. For that purpose, we developed GRNS, a new code based on a fixed point iteration. We find a two-dimensional set of meridional circulation modes, which differ by the number of vortices in the stream lines... |
1804.10746 | Shibei Kong | Chao-Guang Huang, Shibei Kong | Hamiltonian Analysis of 4-dimensional Spacetime in Bondi-like
Coordinates | null | 2018 Chinese Phys. C 42 105101 | 10.1088/1674-1137/42/10/105101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Hamiltonian formulation of gravity in 4-dimensional spacetime
under Bondi-like coordinates{v, r, x^a, a=2, 3}. In Bondi-like coordinates, the
3-dimensional hypersurface is a null hypersurface and the evolution direction
is the advanced time v. The internal symmetry group SO(1,3) of the
4-dimensional sp... | [
{
"created": "Sat, 28 Apr 2018 05:36:05 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2018 11:02:18 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Oct 2018 17:45:46 GMT",
"version": "v3"
}
] | 2018-10-09 | [
[
"Huang",
"Chao-Guang",
""
],
[
"Kong",
"Shibei",
""
]
] | We discuss the Hamiltonian formulation of gravity in 4-dimensional spacetime under Bondi-like coordinates{v, r, x^a, a=2, 3}. In Bondi-like coordinates, the 3-dimensional hypersurface is a null hypersurface and the evolution direction is the advanced time v. The internal symmetry group SO(1,3) of the 4-dimensional spac... |
1709.02657 | Sabine Hossenfelder | Sabine Hossenfelder, Ricardo Gallego Torrom\'e | General Relativity with Local Space-time Defects | 15 pages, 2 figures, replaced with published version | null | 10.1088/1361-6382/aad38c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity is incomplete because it cannot describe quantum effects
of space-time. The complete theory of quantum gravity is not yet known and to
date no observational evidence exists that space-time is quantized. However, in
most approaches to quantum gravity the space-time manifold of general
relativity is ... | [
{
"created": "Fri, 8 Sep 2017 11:45:14 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2018 16:16:37 GMT",
"version": "v2"
}
] | 2018-07-17 | [
[
"Hossenfelder",
"Sabine",
""
],
[
"Torromé",
"Ricardo Gallego",
""
]
] | General relativity is incomplete because it cannot describe quantum effects of space-time. The complete theory of quantum gravity is not yet known and to date no observational evidence exists that space-time is quantized. However, in most approaches to quantum gravity the space-time manifold of general relativity is on... |
gr-qc/9904069 | Mayburov S. N. | S. Mayburov (Lebedev Inst. of Physics, Moscow) | Quantum Space-Time and Reference Frames in ADM Canonical Gravity | 19 pages, Latex, Talk given at 'Quantum Field Theory under External
Conditions' conference, Leipzig, September 1998, to appear in proceedings | null | null | null | gr-qc | null | The quantum space-time model which accounts material Reference Frames (RF)
quantum effects considered for flat space-time and ADM canonical gravity. As
was shown by Aharonov for RF - free material object its c.m. nonrelativistic
motion in vacuum described by Schrodinger wave packet evolution which modify
space coordi... | [
{
"created": "Tue, 27 Apr 1999 12:50:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mayburov",
"S.",
"",
"Lebedev Inst. of Physics, Moscow"
]
] | The quantum space-time model which accounts material Reference Frames (RF) quantum effects considered for flat space-time and ADM canonical gravity. As was shown by Aharonov for RF - free material object its c.m. nonrelativistic motion in vacuum described by Schrodinger wave packet evolution which modify space coordina... |
1104.3654 | Valery Kiselev | V.V.Kiselev, S.A.Timofeev | Cosmological extrapolation of MOND | 20 pages, 5 figures, comments added | Class.Quant.Grav. 29 (2012) 065015 | 10.1088/0264-9381/29/6/065015 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Regime of MOND, which is used in astronomy to describe the gravitating
systems of island type without the need to postulate the existence of a
hypothetical dark matter, is generalized to the case of homogeneous
distribution of usual matter by introducing a linear dependence of the critical
acceleration on the size of... | [
{
"created": "Tue, 19 Apr 2011 07:02:06 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2011 13:34:07 GMT",
"version": "v2"
},
{
"created": "Tue, 31 May 2011 11:32:39 GMT",
"version": "v3"
}
] | 2019-11-28 | [
[
"Kiselev",
"V. V.",
""
],
[
"Timofeev",
"S. A.",
""
]
] | Regime of MOND, which is used in astronomy to describe the gravitating systems of island type without the need to postulate the existence of a hypothetical dark matter, is generalized to the case of homogeneous distribution of usual matter by introducing a linear dependence of the critical acceleration on the size of r... |
1202.2893 | Alexandre Le Tiec | Alexandre Le Tiec | Spacetime Symmetries and Kepler's Third Law | 11 pages, 3 figures; minor changes and text improvements; matches
version to appear in Class. Quant. Grav | Class.Quant.Grav.29:217002,2012 | 10.1088/0264-9381/29/21/217002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The curved spacetime geometry of a system of two point masses moving on a
circular orbit has a helical symmetry. We show how Kepler's third law for
circular motion, and its generalization in post-Newtonian theory, can be
recovered from a simple, covariant condition on the norm of the associated
helical Killing vector... | [
{
"created": "Mon, 13 Feb 2012 23:15:34 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2012 19:54:30 GMT",
"version": "v2"
}
] | 2013-08-26 | [
[
"Tiec",
"Alexandre Le",
""
]
] | The curved spacetime geometry of a system of two point masses moving on a circular orbit has a helical symmetry. We show how Kepler's third law for circular motion, and its generalization in post-Newtonian theory, can be recovered from a simple, covariant condition on the norm of the associated helical Killing vector f... |
1607.01234 | Yadao Solanke | Y. S. Solanke, D. D.Pawar and V. J. Dagwal | Role of the constant deceleration parameter in cosmological models with
perfect fluid and dark energy | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main purpose of the present paper is to investigate LRS Bianchi type I
metric in the presence of perfect fluid and dark energy. In order to obtain a
deterministic solution of the field equations we have assumed that, the two
sources of the perfect fluid and dark energy interact minimally with separate
conservatio... | [
{
"created": "Tue, 5 Jul 2016 12:58:00 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2020 06:57:45 GMT",
"version": "v2"
}
] | 2020-03-06 | [
[
"Solanke",
"Y. S.",
""
],
[
"Pawar",
"D. D.",
""
],
[
"Dagwal",
"V. J.",
""
]
] | The main purpose of the present paper is to investigate LRS Bianchi type I metric in the presence of perfect fluid and dark energy. In order to obtain a deterministic solution of the field equations we have assumed that, the two sources of the perfect fluid and dark energy interact minimally with separate conservation ... |
1011.3667 | Benjamin Bahr | Benjamin Bahr, Bianca Dittrich, Song He | Coarse graining free theories with gauge symmetries: the linearized case | 31 pages, 3 pictures, title changed, reference updated | New J.Phys.13:045009,2011 | 10.1088/1367-2630/13/4/045009 | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Discretizations of continuum theories often do not preserve the gauge
symmetry content. This occurs in particular for diffeomorphism symmetry in
general relativity, which leads to severe difficulties both in canonical and
covariant quantization approaches. We discuss here the method of perfect
actions, which attempts... | [
{
"created": "Tue, 16 Nov 2010 12:11:21 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2011 13:00:39 GMT",
"version": "v2"
}
] | 2011-06-10 | [
[
"Bahr",
"Benjamin",
""
],
[
"Dittrich",
"Bianca",
""
],
[
"He",
"Song",
""
]
] | Discretizations of continuum theories often do not preserve the gauge symmetry content. This occurs in particular for diffeomorphism symmetry in general relativity, which leads to severe difficulties both in canonical and covariant quantization approaches. We discuss here the method of perfect actions, which attempts t... |
2303.02990 | Vladimir Folomeev | Vladimir Dzhunushaliev, Vladimir Folomeev, and Dina Zholdakhmet | Spinor domain wall and test fermions on an arbitrary domain wall | 18 pages, 4 figures, minor corrections to content, version published
in EPJC | Eur.Phys.J. C 83, 550 (2023) | 10.1140/epjc/s10052-023-11742-1 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider a spinor domain wall embedded in a five-dimensional spacetime
with a nondiagonal metric. The corresponding plane symmetric solutions for
linear and nonlinear spinor fields with different parameters are obtained. It
is shown that in the general case the metric functions and spinor fields do not
possess $Z_... | [
{
"created": "Mon, 6 Mar 2023 09:35:19 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jul 2023 03:42:56 GMT",
"version": "v2"
}
] | 2023-07-31 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
],
[
"Zholdakhmet",
"Dina",
""
]
] | We consider a spinor domain wall embedded in a five-dimensional spacetime with a nondiagonal metric. The corresponding plane symmetric solutions for linear and nonlinear spinor fields with different parameters are obtained. It is shown that in the general case the metric functions and spinor fields do not possess $Z_2$... |
gr-qc/9810053 | Dmitriy Yu. Shabalkin | Dmitriy Yu. Shabalkin | On the method of effective nonlinear sigma model in plane- and
axially-symmetric vacuum spacetimes | 5 pages, LaTex, submitted to Gravitation and Cosmology | Grav.Cosmol. 4 (1999) 16 | null | UlSU/LFR-9802 | gr-qc | null | In present article effective nonlinear sigma model (NSM) is considered.
Einstein equation solution, corresponded to the chiral fields determined by
functional parameter method, are presented.
Effective NSM of stationary axially-symmetric gravitational field is
constructed. Motion equations are solved exactly by f... | [
{
"created": "Fri, 16 Oct 1998 14:07:22 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Shabalkin",
"Dmitriy Yu.",
""
]
] | In present article effective nonlinear sigma model (NSM) is considered. Einstein equation solution, corresponded to the chiral fields determined by functional parameter method, are presented. Effective NSM of stationary axially-symmetric gravitational field is constructed. Motion equations are solved exactly by functio... |
1001.3407 | Jose Geraldo Pereira | H. I. Arcos, Tiago Gribl Lucas, J. G. Pereira | Consistent Gravitationally-Coupled Spin-2 Field Theory | 16 pages, no figures. V2: Presentation changes, including addition of
a new sub-section, aiming at clarifying the text; version accepted for
publication in Class. Quantum Grav. | Class.Quant.Grav.27:145007,2010 | 10.1088/0264-9381/27/14/145007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the translational gauge structure of teleparallel gravity, the
theory for a fundamental massless spin-2 field is constructed. Accordingly,
instead of being represented by a symmetric second-rank tensor, the fundamental
spin-2 field is assumed to be represented by a spacetime (world) vector field
assuming ... | [
{
"created": "Tue, 19 Jan 2010 21:00:21 GMT",
"version": "v1"
},
{
"created": "Wed, 5 May 2010 11:14:59 GMT",
"version": "v2"
}
] | 2013-02-28 | [
[
"Arcos",
"H. I.",
""
],
[
"Lucas",
"Tiago Gribl",
""
],
[
"Pereira",
"J. G.",
""
]
] | Inspired by the translational gauge structure of teleparallel gravity, the theory for a fundamental massless spin-2 field is constructed. Accordingly, instead of being represented by a symmetric second-rank tensor, the fundamental spin-2 field is assumed to be represented by a spacetime (world) vector field assuming va... |
1705.08602 | Sourav Bhattacharya | Md Sabir Ali and Sourav Bhattacharya | Light bending, static dark energy and related uniqueness of
Schwarzschild-de Sitter spacetime | v2, 18pp, 1 fig; title changed, added references, discussions and
clarifications; improved presentation, main results unchanged; accepted in
PRD | Phys. Rev. D 97 (2018) 024029 | 10.1103/PhysRevD.97.024029 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the Schwarzschild-de Sitter spacetime is static inside the cosmological
event horizon, if the dark energy state parameter is sufficiently close to
$-1$, apparently one could still expect an effectively static geometry, in the
attraction dominated region inside the maximum turn around radius, $R_{\rm TA,
max}$, ... | [
{
"created": "Wed, 24 May 2017 04:23:13 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jan 2018 04:33:42 GMT",
"version": "v2"
}
] | 2018-01-25 | [
[
"Ali",
"Md Sabir",
""
],
[
"Bhattacharya",
"Sourav",
""
]
] | Since the Schwarzschild-de Sitter spacetime is static inside the cosmological event horizon, if the dark energy state parameter is sufficiently close to $-1$, apparently one could still expect an effectively static geometry, in the attraction dominated region inside the maximum turn around radius, $R_{\rm TA, max}$, of... |
gr-qc/0206066 | Edward Teo | Edward Teo and K.F. Wong | Quantum interest in two dimensions | 17 pages, 4 figures; final version to appear in PRD | Phys.Rev. D66 (2002) 064007 | 10.1103/PhysRevD.66.064007 | null | gr-qc | null | The quantum interest conjecture of Ford and Roman asserts that any
negative-energy pulse must necessarily be followed by an over-compensating
positive-energy one within a certain maximum time delay. Furthermore, the
minimum amount of over-compensation increases with the separation between the
pulses. In this paper, w... | [
{
"created": "Fri, 21 Jun 2002 03:20:57 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jul 2002 06:58:16 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Teo",
"Edward",
""
],
[
"Wong",
"K. F.",
""
]
] | The quantum interest conjecture of Ford and Roman asserts that any negative-energy pulse must necessarily be followed by an over-compensating positive-energy one within a certain maximum time delay. Furthermore, the minimum amount of over-compensation increases with the separation between the pulses. In this paper, we ... |
2002.03402 | Marios Bounakis | Marios Bounakis and Gerasimos Rigopoulos | Feynman Rules for Stochastic Inflationary Correlators | 30 pages | JCAP05(2020)046 | 10.1088/1475-7516/2020/05/046 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We elaborate on the functional integral describing the stochastic dynamics of
a spectator field during inflation, comparing its diagrammatic expansion to
that obtained directly from a perturbative solution of the corresponding
Langevin equation. We state Feynman rules for computing arbitrary temporal
$n$-point functi... | [
{
"created": "Sun, 9 Feb 2020 17:32:13 GMT",
"version": "v1"
}
] | 2020-06-02 | [
[
"Bounakis",
"Marios",
""
],
[
"Rigopoulos",
"Gerasimos",
""
]
] | We elaborate on the functional integral describing the stochastic dynamics of a spectator field during inflation, comparing its diagrammatic expansion to that obtained directly from a perturbative solution of the corresponding Langevin equation. We state Feynman rules for computing arbitrary temporal $n$-point function... |
2008.10884 | Salvatore Capozziello | Artyom V. Astashenok, Salvatore Capozziello, Sergei D. Odintsov,
Vasilis K. Oikonomou | Extended Gravity Description for the GW190814 Supermassive Neutron Star | 8 pages, 3 figures | null | 10.1016/j.physletb.2020.135910 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Very recently a compact object with a mass in the range $2.50\div 2.67\,
M_{\odot}$ has been discovered via gravitational waves detection of a compact
binary coalescence. The mass of this object makes it among the heaviest neutron
star never detected or the lightest black hole ever observed. Here we show that
a neutr... | [
{
"created": "Tue, 25 Aug 2020 08:40:16 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Astashenok",
"Artyom V.",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Oikonomou",
"Vasilis K.",
""
]
] | Very recently a compact object with a mass in the range $2.50\div 2.67\, M_{\odot}$ has been discovered via gravitational waves detection of a compact binary coalescence. The mass of this object makes it among the heaviest neutron star never detected or the lightest black hole ever observed. Here we show that a neutron... |
gr-qc/0506079 | John Hartnett | Moshe Carmeli, John G. Hartnett, Firmin J. Oliveira | The Cosmic Time in Terms of the Redshift | 3 pages, 3 figures | Found.Phys.Lett. 19 (2006) 277-283 | 10.1007/s10702-006-0518-3 | null | gr-qc | null | In cosmology one labels the time t since the Big Bang in terms of the
redshift of light emitted at t, as we see it now. In this Note we derive a
formula that relates t to z which is valid for all redshifts. One can go back
in time as far as one wishes, but not to the Big Bang at which the redshift
tends to infinity.
| [
{
"created": "Tue, 14 Jun 2005 04:06:13 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2005 06:46:39 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Carmeli",
"Moshe",
""
],
[
"Hartnett",
"John G.",
""
],
[
"Oliveira",
"Firmin J.",
""
]
] | In cosmology one labels the time t since the Big Bang in terms of the redshift of light emitted at t, as we see it now. In this Note we derive a formula that relates t to z which is valid for all redshifts. One can go back in time as far as one wishes, but not to the Big Bang at which the redshift tends to infinity. |
gr-qc/0109024 | Peter Dunsby | G. F. R. Ellis, P. McEwan, W. Stoeger and P. Dunsby | Causality in Inflationary Universes with Positive Spatial Curvature | 13 pages RevTex4, 4 figures. Changes to the abstract and the section
on Realistic Estimates | Gen.Rel.Grav. 34 (2002) 1461-1481 | 10.1023/A:1020039120851 | null | gr-qc | null | We show that in the case of positively-curved Friedmann-Lema\^{\i}tre
universes $(k=+1)$, an inflationary period in the early universe will for most
initial conditions not solve the horizon problem, no matter how long inflation
lasts. It will only do so for cases where inflation starts in an almost static
state, corr... | [
{
"created": "Thu, 6 Sep 2001 15:22:26 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2002 13:33:26 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Ellis",
"G. F. R.",
""
],
[
"McEwan",
"P.",
""
],
[
"Stoeger",
"W.",
""
],
[
"Dunsby",
"P.",
""
]
] | We show that in the case of positively-curved Friedmann-Lema\^{\i}tre universes $(k=+1)$, an inflationary period in the early universe will for most initial conditions not solve the horizon problem, no matter how long inflation lasts. It will only do so for cases where inflation starts in an almost static state, corres... |
0911.2340 | Abhas Mitra | Abhas Mitra | Einstein energy associated with the Friedmann -Robertson -Walker metric | By mistake a marginally different earlier version was loaded, now the
journal version is uploaded | Gen.Rel.Grav.42:443-469,2010 | 10.1007/s10714-009-0863-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following Einstein's definition of Lagrangian density and gravitational field
energy density (Einstein, A., Ann. Phys. Lpz., 49, 806 (1916); Einstein, A.,
Phys. Z., 19, 115 (1918); Pauli, W., {\it Theory of Relativity}, B.I.
Publications, Mumbai, 1963, Trans. by G. Field), Tolman derived a general
formula for the tot... | [
{
"created": "Thu, 12 Nov 2009 09:49:12 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Nov 2009 11:30:19 GMT",
"version": "v2"
}
] | 2010-02-23 | [
[
"Mitra",
"Abhas",
""
]
] | Following Einstein's definition of Lagrangian density and gravitational field energy density (Einstein, A., Ann. Phys. Lpz., 49, 806 (1916); Einstein, A., Phys. Z., 19, 115 (1918); Pauli, W., {\it Theory of Relativity}, B.I. Publications, Mumbai, 1963, Trans. by G. Field), Tolman derived a general formula for the total... |
gr-qc/9805039 | Shinji Mukohyama | Shinji Mukohyama | Comments on entanglement entropy | Latex, 24 pages, proofs of some equations are added in appendices;
Accepted for publication in Physical Review D | Phys. Rev. D 58, 104023 (1998) | 10.1103/PhysRevD.58.104023 | YITP-98-30 | gr-qc | null | A new interpretation of entanglement entropy is proposed: entanglement
entropy of a pure state with respect to a division of a Hilbert space into two
subspaces 1 and 2 is an amount of information, which can be transmitted through
1 and 2 from a system interacting with 1 to another system interacting with 2.
The trans... | [
{
"created": "Tue, 12 May 1998 05:47:08 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 1998 10:45:51 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Sep 1998 07:51:59 GMT",
"version": "v3"
}
] | 2016-08-25 | [
[
"Mukohyama",
"Shinji",
""
]
] | A new interpretation of entanglement entropy is proposed: entanglement entropy of a pure state with respect to a division of a Hilbert space into two subspaces 1 and 2 is an amount of information, which can be transmitted through 1 and 2 from a system interacting with 1 to another system interacting with 2. The transmi... |
2110.13132 | Amjad Ashoorioon | Amjad Ashoorioon and Mohammad Bagher Jahani Poshteh and Robert B. Mann | Lensing Signatures of a Slowly-Accelerated Black Hole | v3: 14 pages, 12 figures, extended version of the upcoming PRL paper | Phys.Rev.D 107 (2023) 044031 | 10.1103/PhysRevD.107.044031 | IPM/P-2021/38 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accelerating black holes, connected to cosmic strings could evolve to
supermassive black holes. However, if they are going to take part in structure
formation and resides at the center of galaxies, their acceleration should be
small. This slow acceleration does not change the shadow or image position in
gravitational... | [
{
"created": "Mon, 25 Oct 2021 17:57:13 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2022 20:35:16 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Oct 2022 15:53:07 GMT",
"version": "v3"
}
] | 2023-02-17 | [
[
"Ashoorioon",
"Amjad",
""
],
[
"Poshteh",
"Mohammad Bagher Jahani",
""
],
[
"Mann",
"Robert B.",
""
]
] | Accelerating black holes, connected to cosmic strings could evolve to supermassive black holes. However, if they are going to take part in structure formation and resides at the center of galaxies, their acceleration should be small. This slow acceleration does not change the shadow or image position in gravitational l... |
0904.2240 | Xiangdong Zhang | Xiangdong Zhang, Xiaoning Wu and Sijie Gao | On Newman-Penrose constants of stationary electrovacuum spacetimes | 11pages, no figures accepted by PRD | Phys.Rev.D79:104001,2009 | 10.1103/PhysRevD.79.104001 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | A theorem related to the Newman-Penrose constants is proven. The theorem
states that all the Newman-Penrose constants of asymptotically flat,
stationary, asymptotically algebraically special electrovacuum spacetimes are
zero. Straightforward application of this theorem shows that all the
Newman-Penrose constants of t... | [
{
"created": "Wed, 15 Apr 2009 05:52:34 GMT",
"version": "v1"
}
] | 2009-10-29 | [
[
"Zhang",
"Xiangdong",
""
],
[
"Wu",
"Xiaoning",
""
],
[
"Gao",
"Sijie",
""
]
] | A theorem related to the Newman-Penrose constants is proven. The theorem states that all the Newman-Penrose constants of asymptotically flat, stationary, asymptotically algebraically special electrovacuum spacetimes are zero. Straightforward application of this theorem shows that all the Newman-Penrose constants of the... |
gr-qc/0102081 | null | Wu Shuang-Qing and Cai Xu | Hawking Radiation of Dirac Particles in a Variable-mass Kerr Black Hole | 6 pages, revtex (12pt), no figure. Chin. Phys. Lett. 18 (2001) 485
(in press) | Chin.Phys.Lett. 18 (2001) 485 | 10.1088/0256-307X/18/4/306 | null | gr-qc | null | Hawking effect of Dirac particles in a variable-mass Kerr space-time is
investigated by using method of the generalized tortoise coordinate
transformation. The location and the temperature of event horizon of the
non-stationary Kerr black hole are derived. It is shown that the temperature
and the shape of event horiz... | [
{
"created": "Mon, 19 Feb 2001 07:34:57 GMT",
"version": "v1"
}
] | 2017-02-08 | [
[
"Shuang-Qing",
"Wu",
""
],
[
"Xu",
"Cai",
""
]
] | Hawking effect of Dirac particles in a variable-mass Kerr space-time is investigated by using method of the generalized tortoise coordinate transformation. The location and the temperature of event horizon of the non-stationary Kerr black hole are derived. It is shown that the temperature and the shape of event horizon... |
1106.6355 | Tyson Littenberg | Tyson B. Littenberg | A detection pipeline for galactic binaries in LISA data | 12 pages, 8 figures | null | 10.1103/PhysRevD.84.063009 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Galaxy is suspected to contain hundreds of millions of binary white dwarf
systems, a large fraction of which will have sufficiently small orbital period
to emit gravitational radiation in band for space-based gravitational wave
detectors such as the Laser Interferometer Space Antenna (LISA). LISA's main
science g... | [
{
"created": "Thu, 30 Jun 2011 19:55:49 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Littenberg",
"Tyson B.",
""
]
] | The Galaxy is suspected to contain hundreds of millions of binary white dwarf systems, a large fraction of which will have sufficiently small orbital period to emit gravitational radiation in band for space-based gravitational wave detectors such as the Laser Interferometer Space Antenna (LISA). LISA's main science goa... |
gr-qc/0009080 | Eduardo Sergio Santini | N. Pinto-Neto and E. Sergio Santini (CBPF-Rio de Janeiro) | The Consistency of Causal Quantum Geometrodynamics and Quantum Field
Theory | Final version. See also http://www.cosmologia.cbpf.br | Gen.Rel.Grav. 34 (2002) 505-532 | 10.1023/A:1015592724845 | null | gr-qc hep-th quant-ph | null | We consider quantum geometrodynamics and parametrized quantum field theories
in the framework of the Bohm-de Broglie interpretation. In the first case, and
following the lines of our previous work [1], where a hamiltonian formalism for
the bohmian trajectories was constructed, we show the consistency of the theory
fo... | [
{
"created": "Fri, 22 Sep 2000 17:36:27 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Oct 2001 14:04:11 GMT",
"version": "v2"
},
{
"created": "Mon, 27 May 2002 15:52:22 GMT",
"version": "v3"
}
] | 2013-06-21 | [
[
"Pinto-Neto",
"N.",
"",
"CBPF-Rio de Janeiro"
],
[
"Santini",
"E. Sergio",
"",
"CBPF-Rio de Janeiro"
]
] | We consider quantum geometrodynamics and parametrized quantum field theories in the framework of the Bohm-de Broglie interpretation. In the first case, and following the lines of our previous work [1], where a hamiltonian formalism for the bohmian trajectories was constructed, we show the consistency of the theory for ... |
1906.11552 | Cem Yeti\c{s}mi\c{s}o\u{g}lu | Tekin Dereli, Cem Yeti\c{s}mi\c{s}o\u{g}lu | Weyl Covariant Quadratic Curvature Gravity in 3-Dimensional
Riemann-Cartan-Weyl Space-Times | arXiv admin note: text overlap with arXiv:1904.08124 | Phys. Rev. D 100, 044010 (2019) | 10.1103/PhysRevD.100.044010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss locally Weyl (scale) covariant generalisation of quadratic
curvature gravity theory in three dimensions using Riemann-Cartan-Weyl
space-times. We show that this procedure of Weyl gauging yields a consistent
generalisation for a particular class of quadratic curvature gravity theories
which includes the New... | [
{
"created": "Thu, 27 Jun 2019 11:25:32 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Dereli",
"Tekin",
""
],
[
"Yetişmişoğlu",
"Cem",
""
]
] | We discuss locally Weyl (scale) covariant generalisation of quadratic curvature gravity theory in three dimensions using Riemann-Cartan-Weyl space-times. We show that this procedure of Weyl gauging yields a consistent generalisation for a particular class of quadratic curvature gravity theories which includes the New M... |
gr-qc/9704079 | Jan Ambjorn | J. Ambjorn, J. Nielsen, J. Rolf and G. Savvidy | Spikes in Quantum Regge Calculus | 20 pages, Latex2e, 11 figures | Class.Quant.Grav. 14 (1997) 3225-3241 | 10.1088/0264-9381/14/12/009 | NBI-HE-97-20 and DEMO-HEP-97-10 | gr-qc hep-lat hep-th | null | We demonstrate by explicit calculation of the DeWitt-like measure in
two-dimensional quantum Regge gravity that it is highly non-local and that the
average values of link lengths $l, <l^n>$, do not exist for sufficient high
powers of $n$. Thus the concept of length has no natural definition in this
formalism and a ge... | [
{
"created": "Mon, 28 Apr 1997 14:53:09 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Ambjorn",
"J.",
""
],
[
"Nielsen",
"J.",
""
],
[
"Rolf",
"J.",
""
],
[
"Savvidy",
"G.",
""
]
] | We demonstrate by explicit calculation of the DeWitt-like measure in two-dimensional quantum Regge gravity that it is highly non-local and that the average values of link lengths $l, <l^n>$, do not exist for sufficient high powers of $n$. Thus the concept of length has no natural definition in this formalism and a gene... |
gr-qc/0604077 | Jeferson Oliveira de | Jeferson de Oliveira | Spin Zero Perturbation in the Kerr-Randall-Sundrum Space-Time | Master Degree Thesis (Advisor: Elcio Abdalla), 110 pages, 7 figures,
in portuguese | null | null | null | gr-qc | null | This dissertation aims at studying the braneworld models in the context
proposed by Randall and Sundrum. The focus is on the spin-0 perturbations in
the Kerr space-time as a 4-dimensional braneworld.
The work deals the main aspects of Einstein General Relativity as well as
perturbations of black holes metrics. We a... | [
{
"created": "Tue, 18 Apr 2006 17:49:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Oliveira",
"Jeferson",
""
]
] | This dissertation aims at studying the braneworld models in the context proposed by Randall and Sundrum. The focus is on the spin-0 perturbations in the Kerr space-time as a 4-dimensional braneworld. The work deals the main aspects of Einstein General Relativity as well as perturbations of black holes metrics. We also ... |
1903.04379 | Ujjal Debnath | Ujjal Debnath | Thermodynamic Black Hole with Modified Chaplygin Gas as a Heat Engine | 6 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We assume that the negative cosmological constant as a thermodynamical
pressure and the asymptotically anti-de Sitter (AdS) black hole thermodynamics
with modified Chaplygin gas. We have written the mass of the black hole,
volume, entropy and temperature due to the thermodynamic system. We find a new
solution of Eins... | [
{
"created": "Mon, 11 Mar 2019 15:43:54 GMT",
"version": "v1"
}
] | 2019-03-12 | [
[
"Debnath",
"Ujjal",
""
]
] | We assume that the negative cosmological constant as a thermodynamical pressure and the asymptotically anti-de Sitter (AdS) black hole thermodynamics with modified Chaplygin gas. We have written the mass of the black hole, volume, entropy and temperature due to the thermodynamic system. We find a new solution of Einste... |
gr-qc/0201096 | Jorge Stephany | D.E.Diaz and J.Stephany | Radiative Processes of the DeWitt-Takagi Detector | 6 pages, 2 figures | Rev.Mex.Fis. 29S3 (2003) 120-122 | null | SB/F/02-297 | gr-qc hep-th | null | We examine the excitation of a uniformly accelerated DeWitt-Takagi detector
coupled quadratically to a Majorana-Dirac field. We obtain the transition
probability from the ground state of the detector and the vacuum state of the
field to an excited state with the emission of a Minkowski pair of quanta, in
terms of ele... | [
{
"created": "Wed, 30 Jan 2002 21:34:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Diaz",
"D. E.",
""
],
[
"Stephany",
"J.",
""
]
] | We examine the excitation of a uniformly accelerated DeWitt-Takagi detector coupled quadratically to a Majorana-Dirac field. We obtain the transition probability from the ground state of the detector and the vacuum state of the field to an excited state with the emission of a Minkowski pair of quanta, in terms of eleme... |
gr-qc/9407018 | Herbert Balasin | P.C.Aichelburg and H.Balasin | A Note on the Symmetries of the Gravitational Field of a Massless
Particle | 10pages, amslatex, TUW-94-12 and UWThPh-1994-27 | Class.Quant.Grav.11:L121-L123,1994 | 10.1088/0264-9381/11/10/001 | null | gr-qc | null | It is shown that the metric of a massless particle obtained from boosting the
Schwarzschild metric to the velocity of light, has four Killing vectors
corresponding to an $E(2)\times \RR$ symmetry-group. This is in agreement with
the expectations based on flat-space kinematics but is in contrast to previous
statements... | [
{
"created": "Fri, 15 Jul 1994 09:27:37 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Aichelburg",
"P. C.",
""
],
[
"Balasin",
"H.",
""
]
] | It is shown that the metric of a massless particle obtained from boosting the Schwarzschild metric to the velocity of light, has four Killing vectors corresponding to an $E(2)\times \RR$ symmetry-group. This is in agreement with the expectations based on flat-space kinematics but is in contrast to previous statements i... |
1303.6250 | Daniela Pugliese Dr | Daniela Pugliese, Hernando Quevedo, and Remo Ruffini | Equatorial circular orbits of neutral test particles in the Kerr--Newman
spacetime | 28 pages, 26 figures, 6 tables. This work follows the papers:
DOI:10.1103/PhysRevD.84.044030; DOI:10.1103/PhysRevD.83.104052;
DOI:10.1103/PhysRevD.83.024021 This is a revised version to meet the
published article | Phys. Rev. D 88, 024042 (2013) | 10.1103/PhysRevD.88.024042 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed analysis of the orbital circular motion of electrically
neutral test particles on the equatorial plane of the Kerr-Newman spacetime.
Many details of the motion in the cases of black hole and naked singularity
sources are pointed out. We identify four different types of orbital regions,
which dep... | [
{
"created": "Mon, 25 Mar 2013 18:57:47 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Jul 2013 14:33:46 GMT",
"version": "v2"
}
] | 2013-07-31 | [
[
"Pugliese",
"Daniela",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Ruffini",
"Remo",
""
]
] | We present a detailed analysis of the orbital circular motion of electrically neutral test particles on the equatorial plane of the Kerr-Newman spacetime. Many details of the motion in the cases of black hole and naked singularity sources are pointed out. We identify four different types of orbital regions, which depen... |
1508.00441 | Daniele Vernieri | Salvatore Capozziello, S. J. Gabriele Gionti, Daniele Vernieri | String duality transformations in $f(R)$ gravity from Noether symmetry
approach | v1: 13 pages; v2: minor rephrasings, published version | JCAP 1601, 015 (2016) | 10.1088/1475-7516/2016/01/015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We select $f(R)$ gravity models that undergo scale factor duality
transformations. As a starting point, we consider the tree-level effective
gravitational action of bosonic String Theory coupled with the dilaton field.
This theory inherits the Busher's duality of its parent String Theory. Using
conformal transformati... | [
{
"created": "Mon, 3 Aug 2015 15:01:06 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2016 16:36:51 GMT",
"version": "v2"
}
] | 2016-02-10 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Gionti",
"S. J. Gabriele",
""
],
[
"Vernieri",
"Daniele",
""
]
] | We select $f(R)$ gravity models that undergo scale factor duality transformations. As a starting point, we consider the tree-level effective gravitational action of bosonic String Theory coupled with the dilaton field. This theory inherits the Busher's duality of its parent String Theory. Using conformal transformation... |
1104.2851 | Mario Lubini | M. Lubini, C. Tortora, J. N\"af, Ph. Jetzer and S. Capozziello | Probing the dark matter issue in f(R)-gravity via gravitational lensing | 7 pages, accepted for publication in EPJC | Eur. Phys. J. C (2011) 71, 1834 | 10.1140/epjc/s10052-011-1834-8 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a general class of analytic f(R)-gravity theories, we discuss the weak
field limit in view of gravitational lensing. Though an additional Yukawa term
in the gravitational potential modifies dynamics with respect to the standard
Newtonian limit of General Relativity, the motion of massless particles results
unaffe... | [
{
"created": "Thu, 14 Apr 2011 18:05:07 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Dec 2011 13:10:05 GMT",
"version": "v2"
}
] | 2012-02-09 | [
[
"Lubini",
"M.",
""
],
[
"Tortora",
"C.",
""
],
[
"Näf",
"J.",
""
],
[
"Jetzer",
"Ph.",
""
],
[
"Capozziello",
"S.",
""
]
] | For a general class of analytic f(R)-gravity theories, we discuss the weak field limit in view of gravitational lensing. Though an additional Yukawa term in the gravitational potential modifies dynamics with respect to the standard Newtonian limit of General Relativity, the motion of massless particles results unaffect... |
gr-qc/0209090 | Chris Doran | Anthony Lasenby, Chris Doran, Jonathan Pritchard, Alejandro Caceres
and Sam Dolan | Bound states and decay times of fermions in a Schwarzschild black hole
background | 27 pages, 14 figures, fully revised version | Phys.Rev.D72:105014,2005 | 10.1103/PhysRevD.72.105014 | null | gr-qc astro-ph hep-th | null | We compute the spectrum of normalizable fermion bound states in a
Schwarzschild black hole background. The eigenstates have complex energies. The
real part of the energies, for small couplings, closely follow a hydrogen-like
spectrum. The imaginary parts give decay times for the various states, due to
the absorption ... | [
{
"created": "Tue, 24 Sep 2002 15:13:45 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2005 14:30:15 GMT",
"version": "v2"
}
] | 2011-06-24 | [
[
"Lasenby",
"Anthony",
""
],
[
"Doran",
"Chris",
""
],
[
"Pritchard",
"Jonathan",
""
],
[
"Caceres",
"Alejandro",
""
],
[
"Dolan",
"Sam",
""
]
] | We compute the spectrum of normalizable fermion bound states in a Schwarzschild black hole background. The eigenstates have complex energies. The real part of the energies, for small couplings, closely follow a hydrogen-like spectrum. The imaginary parts give decay times for the various states, due to the absorption pr... |
1208.4481 | Narayan Banerjee | Barun Majumder and Narayan Banerjee | Perfect Fluid Quantum Anisotropic Universe: Merits and Challenges | 13 pages, 4 figures; Accepted for publication in Gen Relativ Gravit | null | 10.1007/s10714-012-1446-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper deals with quantization of perfect fluid anisotropic
cosmological models. Bianchi type V and IX models are discussed following
Schutz's method of expressing fluid velocities in terms of six potentials. The
wave functions are found for several examples of equations of state. In one
case a complete wa... | [
{
"created": "Wed, 22 Aug 2012 11:47:28 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Majumder",
"Barun",
""
],
[
"Banerjee",
"Narayan",
""
]
] | The present paper deals with quantization of perfect fluid anisotropic cosmological models. Bianchi type V and IX models are discussed following Schutz's method of expressing fluid velocities in terms of six potentials. The wave functions are found for several examples of equations of state. In one case a complete wave... |
2001.08759 | Merced Montesinos | Merced Montesinos, Rodrigo Romero, Diego Gonzalez | The gauge symmetries of f(R) gravity with torsion in the Cartan
formalism | It contains a detailed derivation of the generalization of
3-dimensional "local translations" for 4-dimensional first-order general
relativity | Class. Quantum Grav. 37, 045008 (2020) | 10.1088/1361-6382/ab6272 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First-order general relativity in $n$ dimensions ($n \geq 3$) has an internal
gauge symmetry that is the higher-dimensional generalization of
three-dimensional local translations. We report the extension of this symmetry
for $n$-dimensional f(R) gravity with torsion in the Cartan formalism. The new
symmetry arises fr... | [
{
"created": "Thu, 23 Jan 2020 19:00:10 GMT",
"version": "v1"
}
] | 2020-01-27 | [
[
"Montesinos",
"Merced",
""
],
[
"Romero",
"Rodrigo",
""
],
[
"Gonzalez",
"Diego",
""
]
] | First-order general relativity in $n$ dimensions ($n \geq 3$) has an internal gauge symmetry that is the higher-dimensional generalization of three-dimensional local translations. We report the extension of this symmetry for $n$-dimensional f(R) gravity with torsion in the Cartan formalism. The new symmetry arises from... |
1912.12981 | Philippe G. LeFloch | Bruno Le Floch and Philippe G. LeFloch | Compensated compactness and corrector stress tensor for the Einstein
equations in T2 symmetry | 6 pages | Port. Math. 77 (2020), 409-421 | 10.4171/PM/2057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Einstein equations in T2 symmetry, either for vacuum
spacetimes or coupled to the Euler equations for a compressible fluid, and we
introduce the notion of T2 areal flows on T3 with finite total energy. By
uncovering a hidden structure of the Einstein equations, we establish a
compensated compactness f... | [
{
"created": "Mon, 30 Dec 2019 16:15:41 GMT",
"version": "v1"
}
] | 2021-01-05 | [
[
"Floch",
"Bruno Le",
""
],
[
"LeFloch",
"Philippe G.",
""
]
] | We consider the Einstein equations in T2 symmetry, either for vacuum spacetimes or coupled to the Euler equations for a compressible fluid, and we introduce the notion of T2 areal flows on T3 with finite total energy. By uncovering a hidden structure of the Einstein equations, we establish a compensated compactness fra... |
2301.04187 | V Gayathri | V. Gayathri, Daniel Wysocki, Y. Yang, R. O Shaughnessy, Z. Haiman, H.
Tagawa, and I. Bartos | Gravitational wave source populations: Disentangling an AGN component | 7 pages, 4 figures, and 1 table | null | 10.3847/2041-8213/acbfb8 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The astrophysical origin of the over 90 compact binary mergers discovered by
the LIGO and Virgo gravitational wave observatories is an open question. While
the unusual mass and spin of some of the discovered objects constrain
progenitor scenarios, the observed mergers are consistent with multiple
interpretations. A p... | [
{
"created": "Tue, 10 Jan 2023 19:50:32 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"Gayathri",
"V.",
""
],
[
"Wysocki",
"Daniel",
""
],
[
"Yang",
"Y.",
""
],
[
"Shaughnessy",
"R. O",
""
],
[
"Haiman",
"Z.",
""
],
[
"Tagawa",
"H.",
""
],
[
"Bartos",
"I.",
""
]
] | The astrophysical origin of the over 90 compact binary mergers discovered by the LIGO and Virgo gravitational wave observatories is an open question. While the unusual mass and spin of some of the discovered objects constrain progenitor scenarios, the observed mergers are consistent with multiple interpretations. A pro... |
1906.00011 | Antonios Tsokaros A. | Antonios Tsokaros, Milton Ruiz, Vasileios Paschalidis, Stuart L.
Shapiro, K\=oji Ury\=u | Effect of spin on the inspiral of binary neutron stars | 11 pages, 6 figures | Phys. Rev. D 100, 024061 (2019) | 10.1103/PhysRevD.100.024061 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform long-term simulations of spinning binary neutron stars, with our
highest dimensionless spin being $\chi \sim 0.32$. To assess the importance of
spin during the inspiral we vary the spin, and also use two equations of state,
one that consists of plain nuclear matter and produces compact stars (SLy), and
a h... | [
{
"created": "Fri, 31 May 2019 18:00:02 GMT",
"version": "v1"
}
] | 2019-08-07 | [
[
"Tsokaros",
"Antonios",
""
],
[
"Ruiz",
"Milton",
""
],
[
"Paschalidis",
"Vasileios",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Uryū",
"Kōji",
""
]
] | We perform long-term simulations of spinning binary neutron stars, with our highest dimensionless spin being $\chi \sim 0.32$. To assess the importance of spin during the inspiral we vary the spin, and also use two equations of state, one that consists of plain nuclear matter and produces compact stars (SLy), and a hyb... |
1006.2978 | Nils Andersson | C.S. Lopez-Monsalvo and N. Andersson | Thermal Dynamics in General Relativity | null | Proc.Roy.Soc.Lond.A467:738-759,2010 | 10.1098/rspa.2010.0308 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a relativistic model for heat conduction, building on a convective
variational approach to multi-fluid systems where the entropy is treated as a
distinct dynamical entity. We demonstrate how this approach leads to a
relativistic version of the Cattaneo equation, encoding the finite thermal
relaxation time ... | [
{
"created": "Tue, 15 Jun 2010 13:12:37 GMT",
"version": "v1"
}
] | 2011-02-11 | [
[
"Lopez-Monsalvo",
"C. S.",
""
],
[
"Andersson",
"N.",
""
]
] | We discuss a relativistic model for heat conduction, building on a convective variational approach to multi-fluid systems where the entropy is treated as a distinct dynamical entity. We demonstrate how this approach leads to a relativistic version of the Cattaneo equation, encoding the finite thermal relaxation time th... |
2303.13917 | Tiago Fernandes | Tiago S. Fernandes and Samuel J. Vieira and Antonio Onofre and Juan
Calder\'on Bustillo and Alejandro Torres-Forn\'e and Jos\'e A. Font | Convolutional Neural Networks for the classification of glitches in
gravitational-wave data streams | 15 pages, 14 figures | null | 10.1088/1361-6382/acf26c | null | gr-qc astro-ph.IM cs.CV cs.LG | http://creativecommons.org/licenses/by/4.0/ | We investigate the use of Convolutional Neural Networks (including the modern
ConvNeXt network family) to classify transient noise signals (i.e.~glitches)
and gravitational waves in data from the Advanced LIGO detectors. First, we use
models with a supervised learning approach, both trained from scratch using the
Gra... | [
{
"created": "Fri, 24 Mar 2023 11:12:37 GMT",
"version": "v1"
}
] | 2023-08-28 | [
[
"Fernandes",
"Tiago S.",
""
],
[
"Vieira",
"Samuel J.",
""
],
[
"Onofre",
"Antonio",
""
],
[
"Bustillo",
"Juan Calderón",
""
],
[
"Torres-Forné",
"Alejandro",
""
],
[
"Font",
"José A.",
""
]
] | We investigate the use of Convolutional Neural Networks (including the modern ConvNeXt network family) to classify transient noise signals (i.e.~glitches) and gravitational waves in data from the Advanced LIGO detectors. First, we use models with a supervised learning approach, both trained from scratch using the Gravi... |
gr-qc/0607053 | J. Fernando Barbero G. | J. Fernando Barbero G., I\~naki Garay, Eduardo J. S. Villase\~nor | Probing Quantized Einstein-Rosen Waves with Massless Scalar Matter | Accepted for publication in Physical Review D | Phys.Rev.D74:044004,2006 | 10.1103/PhysRevD.74.044004 | null | gr-qc | null | The purpose of this paper is to discuss in detail the use of scalar matter
coupled to linearly polarized Einstein-Rosen waves as a probe to study quantum
gravity in the restricted setting provided by this symmetry reduction of
general relativity. We will obtain the relevant Hamiltonian and quantize it
with the techni... | [
{
"created": "Thu, 13 Jul 2006 08:58:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"G.",
"J. Fernando Barbero",
""
],
[
"Garay",
"Iñaki",
""
],
[
"Villaseñor",
"Eduardo J. S.",
""
]
] | The purpose of this paper is to discuss in detail the use of scalar matter coupled to linearly polarized Einstein-Rosen waves as a probe to study quantum gravity in the restricted setting provided by this symmetry reduction of general relativity. We will obtain the relevant Hamiltonian and quantize it with the techniqu... |
1602.07478 | Xiangdong Zhang | You Ding and Xiangdong Zhang | 2+1 dimensional loop quantum cosmology of Bianchi I models | 11 pages | International Journal of Modern Physics A, Vol. 35, No. 29,
2050185 (2020) | 10.1142/S0217751X20501857 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the anisotropic Bianchi I loop quantum cosmology in 2+1 dimensions.
Both the $\mubar$ and $\mubar'$ schemes are considered in the present paper and
the following expected results are established: (i) the massless scalar field
again play the role of emergent time variables and serves as an internal clock;
(ii... | [
{
"created": "Wed, 24 Feb 2016 12:30:30 GMT",
"version": "v1"
}
] | 2020-10-23 | [
[
"Ding",
"You",
""
],
[
"Zhang",
"Xiangdong",
""
]
] | We study the anisotropic Bianchi I loop quantum cosmology in 2+1 dimensions. Both the $\mubar$ and $\mubar'$ schemes are considered in the present paper and the following expected results are established: (i) the massless scalar field again play the role of emergent time variables and serves as an internal clock; (ii) ... |
2011.00661 | Bogar D\'iaz | J. Fernando Barbero G., Bogar D\'iaz, Juan Margalef-Bentabol and
Eduardo J.S. Villase\~nor | Concise symplectic formulation for tetrad gravity | 5 pages | Physical Review D, 103 (2021) 024051 | 10.1103/PhysRevD.103.024051 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a simple symplectic formulation for tetrad gravity that leads to
the real Ashtekar variables in a direct and transparent way. It also sheds
light on the role of the Immirzi parameter and the time gauge.
| [
{
"created": "Mon, 2 Nov 2020 00:54:37 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2021 20:18:18 GMT",
"version": "v2"
}
] | 2021-03-18 | [
[
"G.",
"J. Fernando Barbero",
""
],
[
"Díaz",
"Bogar",
""
],
[
"Margalef-Bentabol",
"Juan",
""
],
[
"Villaseñor",
"Eduardo J. S.",
""
]
] | We discuss a simple symplectic formulation for tetrad gravity that leads to the real Ashtekar variables in a direct and transparent way. It also sheds light on the role of the Immirzi parameter and the time gauge. |
1805.00592 | Francisco Tello Ortiz | E. Morales and Francisco Tello-Ortiz | Charged anisotropic compact objects by gravitational decoupling | null | null | 10.1140/epjc/s10052-018-6102-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present article, we have constructed a static charged anisotropic
compact star model of Einstein field equations for a spherically symmetric
space-time geometry. Specifically, we have extended the charged isotropic
Heintzmann solution to an anisotropic domain. To address this work, we have
employed the gravita... | [
{
"created": "Wed, 2 May 2018 01:22:59 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2018 19:54:21 GMT",
"version": "v2"
}
] | 2018-08-29 | [
[
"Morales",
"E.",
""
],
[
"Tello-Ortiz",
"Francisco",
""
]
] | In the present article, we have constructed a static charged anisotropic compact star model of Einstein field equations for a spherically symmetric space-time geometry. Specifically, we have extended the charged isotropic Heintzmann solution to an anisotropic domain. To address this work, we have employed the gravitati... |
2405.18420 | Marko Stojanovic | Goran S. Djordjevic, Neven Bili\'c, Dragoljub D. Dimitrijevic, Milan
Milosevic, Marko Stojanovic | On attractor behavior in braneworld constant-roll inflation | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We investigate in detail the attractor behavior of some inflationary models
based on braneworld dynamics under the constant-roll condition. We describe the
dynamics of the models, assuming that the second slow-roll parameter remains
constant during inflation. We show that the dynamics of the considered models
have th... | [
{
"created": "Tue, 28 May 2024 17:58:08 GMT",
"version": "v1"
}
] | 2024-05-29 | [
[
"Djordjevic",
"Goran S.",
""
],
[
"Bilić",
"Neven",
""
],
[
"Dimitrijevic",
"Dragoljub D.",
""
],
[
"Milosevic",
"Milan",
""
],
[
"Stojanovic",
"Marko",
""
]
] | We investigate in detail the attractor behavior of some inflationary models based on braneworld dynamics under the constant-roll condition. We describe the dynamics of the models, assuming that the second slow-roll parameter remains constant during inflation. We show that the dynamics of the considered models have the ... |
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