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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.2318 | Carlos Kozameh | Carlos Kozameh, E.T. Newman, and Gilberto Silva-Ortigoza | The Geometry of Regular Shear-Free Null Geodesic Congruences, CR
functions and their Application to the Flat-Space Maxwell Equations | 25 pages | Class.Quant.Grav.24:5479-5494,2007 | 10.1088/0264-9381/24/22/012 | null | gr-qc | null | We describe here what appears to be a new structure that is hidden in all
asymptotically vanishing Maxwell fields possessing a non-vanishing total
charge. Though we are dealing with real Maxwell fields on real Minkowski space
nevertheless, directly from the asymptotic field one can extract a complex
analytic world-li... | [
{
"created": "Fri, 15 Jun 2007 15:29:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kozameh",
"Carlos",
""
],
[
"Newman",
"E. T.",
""
],
[
"Silva-Ortigoza",
"Gilberto",
""
]
] | We describe here what appears to be a new structure that is hidden in all asymptotically vanishing Maxwell fields possessing a non-vanishing total charge. Though we are dealing with real Maxwell fields on real Minkowski space nevertheless, directly from the asymptotic field one can extract a complex analytic world-line... |
2009.05628 | Brian Pardo | Brian A. Pardo and Nat\'alia T. Maia | Next-to-leading order spin-orbit effects in the equations of motion,
energy loss and phase evolution of binaries of compact bodies in the
effective field theory approach | 19 pages, 1 figure | Phys. Rev. D 102, 124020 (2020) | 10.1103/PhysRevD.102.124020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute spin-orbit effects in the equations of motion, binding energy and
energy loss of binary systems of compact objects at the next-to-leading order
in the post-Newtonian (PN) approximation in the effective field theory (EFT)
framework. We then use these quantities to compute the evolution of the orbital
freque... | [
{
"created": "Fri, 11 Sep 2020 19:24:04 GMT",
"version": "v1"
}
] | 2021-01-04 | [
[
"Pardo",
"Brian A.",
""
],
[
"Maia",
"Natália T.",
""
]
] | We compute spin-orbit effects in the equations of motion, binding energy and energy loss of binary systems of compact objects at the next-to-leading order in the post-Newtonian (PN) approximation in the effective field theory (EFT) framework. We then use these quantities to compute the evolution of the orbital frequenc... |
gr-qc/0402061 | Parthasarathi Majumdar | Ashok Chatterjee and Parthasarathi Majumdar | Universal canonical entropy for gravitating systems | 6 pages revtex, one eps figure; based on talk delivered at the
International Conference on Gravitation and Cosmology held at Kochi, India
during 5-9 January, 2004 | Pramana63:851-858,2004 | 10.1007/BF02705206 | null | gr-qc | null | The thermodynamics of general relativistic systems with boundary, obeying a
Hamiltonian constraint in the bulk, is argued to be determined solely by the
boundary quantum dynamics, and hence by the area spectrum. Assuming, for large
area of the boundary, (a) an area spectrum as determined by Non-perturbative
Canonical... | [
{
"created": "Fri, 13 Feb 2004 13:43:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Chatterjee",
"Ashok",
""
],
[
"Majumdar",
"Parthasarathi",
""
]
] | The thermodynamics of general relativistic systems with boundary, obeying a Hamiltonian constraint in the bulk, is argued to be determined solely by the boundary quantum dynamics, and hence by the area spectrum. Assuming, for large area of the boundary, (a) an area spectrum as determined by Non-perturbative Canonical Q... |
gr-qc/9802036 | Hideki Ishihara | Akihiro Ishibashi and Hideki Ishihara | Equation of motion for a domain wall coupled to gravitational field | 13 pages, latex, no figures, uses REVTeX | Phys.Rev. D60 (1999) 124016 | 10.1103/PhysRevD.60.124016 | TIT/HEP-387/COSMO-88 | gr-qc | null | The equation of motion for a domain wall coupled to gravitational field is
derived from the Nambu-Goto action. The domain wall is treated as a source of
gravitational field. The perturbed equation is also obtained with gravitational
back reaction on the wall motion taken into account. For general spherically
symmetri... | [
{
"created": "Mon, 16 Feb 1998 13:10:47 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ishibashi",
"Akihiro",
""
],
[
"Ishihara",
"Hideki",
""
]
] | The equation of motion for a domain wall coupled to gravitational field is derived from the Nambu-Goto action. The domain wall is treated as a source of gravitational field. The perturbed equation is also obtained with gravitational back reaction on the wall motion taken into account. For general spherically symmetric ... |
1106.6346 | Joseph Polchinski | Joseph Polchinski | Comment on [arXiv:1106.1417] "Small Lorentz violations in quantum
gravity: do they lead to unacceptably large effects?" | 3 pages. v2: slightly expanded version, emphasizing that almost all
Lorentz-violating theories are ruled out by precision tests | null | 10.1088/0264-9381/29/8/088001 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent paper by Gambini, Rastgoo and Pullin [arXiv:1106.1417 investigates
the important issue of constraints from Lorentz invariance on Planck scale
physics, arguing that the classic analysis of Collins, Perez, Sudarsky, Urrutia
and Vucetich \cite{cpsuv} is not generally valid. We argue that the new work is
based o... | [
{
"created": "Thu, 30 Jun 2011 19:27:39 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 2011 16:00:24 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Polchinski",
"Joseph",
""
]
] | A recent paper by Gambini, Rastgoo and Pullin [arXiv:1106.1417 investigates the important issue of constraints from Lorentz invariance on Planck scale physics, arguing that the classic analysis of Collins, Perez, Sudarsky, Urrutia and Vucetich \cite{cpsuv} is not generally valid. We argue that the new work is based on ... |
1207.5730 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Self-adjointness in the Hamiltonians of deparameterized totally
constrained theories: a model | 5 pages, no figures | null | 10.1103/PhysRevD.86.067501 | LSU-REL-072412 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several proposals to deal with the dynamics of general relativity involve
gauge fixings or the introduction matter fields in terms of which the theory is
deparameterized. The resulting theories have true Hamiltonians for their
evolution that usually involve square roots, and this poses certain challenges
for their im... | [
{
"created": "Tue, 24 Jul 2012 15:46:17 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | Several proposals to deal with the dynamics of general relativity involve gauge fixings or the introduction matter fields in terms of which the theory is deparameterized. The resulting theories have true Hamiltonians for their evolution that usually involve square roots, and this poses certain challenges for their impl... |
gr-qc/0507016 | Roald Sosnovskiy | Roald Sosnovskiy | The gravitation energy for a cylindrically and spherically symmetrical
system | 6 pages;added reference, corrected | null | null | null | gr-qc | null | It has been shown that t00 component of the energy-momentum pseudotensor in
the case of cylindrically symmetrical static gravitational field cannot be
interpreted as energy density of the gravitation field. An approach has been
suggested allows one to express the energy density of the cylindrically or
spherically sym... | [
{
"created": "Mon, 4 Jul 2005 14:24:10 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jul 2005 12:58:43 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jan 2007 17:55:04 GMT",
"version": "v3"
},
{
"created": "Fri, 16 Mar 2007 14:13:54 GMT",
"version": "v4"
},
{
"crea... | 2007-05-23 | [
[
"Sosnovskiy",
"Roald",
""
]
] | It has been shown that t00 component of the energy-momentum pseudotensor in the case of cylindrically symmetrical static gravitational field cannot be interpreted as energy density of the gravitation field. An approach has been suggested allows one to express the energy density of the cylindrically or spherically symme... |
1512.00402 | Lorenzo Sebastiani | Ratbay Myrzakulov and Lorenzo Sebastiani | Scalar tensor Horndeski models: simple cosmological applications | 12 pages, finale version accepted in Astrophysics and Space Science | null | 10.1007/s10509-015-2646-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we analyze a simple class of Horndeski scalar-tensor theory.
We investigate several cosmological solutions for inflation, bounce scenario
and finite future-time singuarities. Perturbations respect to
Friedmann-Robertson-Walker metric are studied and discussed in the context of
inflation.
| [
{
"created": "Sun, 29 Nov 2015 14:16:43 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Dec 2015 05:57:15 GMT",
"version": "v2"
}
] | 2016-02-03 | [
[
"Myrzakulov",
"Ratbay",
""
],
[
"Sebastiani",
"Lorenzo",
""
]
] | In this paper, we analyze a simple class of Horndeski scalar-tensor theory. We investigate several cosmological solutions for inflation, bounce scenario and finite future-time singuarities. Perturbations respect to Friedmann-Robertson-Walker metric are studied and discussed in the context of inflation. |
gr-qc/9911042 | Lior M. Burko | Lior M. Burko | Self force on static charges in Schwarzschild spacetime | 21 pages, 9 Encapsulated PostScript figures, submitted to Class.
Quantum Grav | Class.Quant.Grav.17:227-250,2000 | 10.1088/0264-9381/17/1/316 | null | gr-qc hep-th | null | We study the self forces acting on static scalar and electric test charges in
the spacetime of a Schwarzschild black hole. The analysis is based on a direct,
local calculation of the self forces via mode decomposition, and on two
independent regularization procedures: A spatially-extended particle model
method, and o... | [
{
"created": "Wed, 10 Nov 1999 22:21:54 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Burko",
"Lior M.",
""
]
] | We study the self forces acting on static scalar and electric test charges in the spacetime of a Schwarzschild black hole. The analysis is based on a direct, local calculation of the self forces via mode decomposition, and on two independent regularization procedures: A spatially-extended particle model method, and on ... |
gr-qc/9403060 | null | Bjorn Jensen and Ulf Linstrom | Scattering of Fermions off Dilaton Black Holes | 12, Oslo-TP-4-94, USITP-94-5 | Class.Quant.Grav.11:2435-2442,1994 | 10.1088/0264-9381/11/10/005 | null | gr-qc | null | We discuss how various properties of dilaton black holes depend on the
dilaton coupling constant $a$. In particular we investigate the $a$-dependence
of certain mass parameters both outside and in the extremal limit and discuss
their relation to thermodynamical quantities. To further illuminate the role of
the coupli... | [
{
"created": "Wed, 30 Mar 1994 10:49:00 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Apr 1994 14:54:42 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Jensen",
"Bjorn",
""
],
[
"Linstrom",
"Ulf",
""
]
] | We discuss how various properties of dilaton black holes depend on the dilaton coupling constant $a$. In particular we investigate the $a$-dependence of certain mass parameters both outside and in the extremal limit and discuss their relation to thermodynamical quantities. To further illuminate the role of the coupling... |
2007.09405 | Cormac Breen | Peter Taylor, Cormac Breen | Semi-Classical Backreaction on Asymptotically Anti-de Sitter Black Holes | 25 pages, 4 figures. Significant edits to Section IV including the
addition of two new subsections. Accepted for publication in Physical Review
D | Phys. Rev. D 103, 025006 (2021) | 10.1103/PhysRevD.103.025006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a quantum scalar field on the classical background of an
asymptotically anti-de Sitter black hole and the backreaction the field's
stress-energy tensor induces on the black hole geometry. The backreaction is
computed by solving the reduced-order semi-classical Einstein field equations
sourced by simple an... | [
{
"created": "Sat, 18 Jul 2020 11:03:29 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jul 2020 15:34:44 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Dec 2020 10:31:49 GMT",
"version": "v3"
}
] | 2021-01-14 | [
[
"Taylor",
"Peter",
""
],
[
"Breen",
"Cormac",
""
]
] | We consider a quantum scalar field on the classical background of an asymptotically anti-de Sitter black hole and the backreaction the field's stress-energy tensor induces on the black hole geometry. The backreaction is computed by solving the reduced-order semi-classical Einstein field equations sourced by simple anal... |
gr-qc/0310061 | Emanuele Berti | Emanuele Berti (Thessaloniki, WashU, IAP), Nikolaos Stergioulas
(Thessaloniki) | Approximate Matching of Analytic and Numerical Solutions for Rapidly
Rotating Neutron Stars | 18 pages, 9 figures, MNRAS accepted. A Mathematica script for
computing analytic solutions and comparing with numerical models can be
downloaded at http://www.astro.auth.gr/~niksterg/projects/BertiStergioulas/ | Mon.Not.Roy.Astron.Soc. 350 (2004) 1416 | 10.1111/j.1365-2966.2004.07740.x | null | gr-qc astro-ph | null | We investigate the properties of a closed-form analytic solution recently
found by Manko et al. (2000) for the exterior spacetime of rapidly rotating
neutron stars. For selected equations of state we numerically solve the full
Einstein equations to determine the neutron star spacetime along constant rest
mass sequenc... | [
{
"created": "Mon, 13 Oct 2003 15:38:40 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Feb 2004 18:10:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Berti",
"Emanuele",
"",
"Thessaloniki, WashU, IAP"
],
[
"Stergioulas",
"Nikolaos",
"",
"Thessaloniki"
]
] | We investigate the properties of a closed-form analytic solution recently found by Manko et al. (2000) for the exterior spacetime of rapidly rotating neutron stars. For selected equations of state we numerically solve the full Einstein equations to determine the neutron star spacetime along constant rest mass sequences... |
1301.0809 | Babak Vakili | B. Vakili and V. Kord | Classical and quantum Ho\v{r}ava-Lifshitz cosmology in a minisuperspace
perspective | 15 pages, 12 figures. revised version. arXiv admin note: substantial
text overlap with arXiv:1204.1456 | Gen. Rel. Grav. 45 (2013) 1313 | 10.1007/s10714-013-1527-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical and quantum models of a Friedmann-Robertson-Walker
(FRW) cosmology in the framework of the gravity theory proposed by Ho\v{r}ava,
the so-called Ho\v{r}ava-Lifshitz theory of gravity. Beginning with the ADM
representation of the action corresponding to this model, we construct the
Lagrangian in ... | [
{
"created": "Fri, 4 Jan 2013 19:35:28 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2013 15:46:02 GMT",
"version": "v2"
}
] | 2013-06-11 | [
[
"Vakili",
"B.",
""
],
[
"Kord",
"V.",
""
]
] | We study the classical and quantum models of a Friedmann-Robertson-Walker (FRW) cosmology in the framework of the gravity theory proposed by Ho\v{r}ava, the so-called Ho\v{r}ava-Lifshitz theory of gravity. Beginning with the ADM representation of the action corresponding to this model, we construct the Lagrangian in te... |
2007.10971 | Tapobrata Sarkar | Sandip Chowdhury, Kunal Pal, Kuntal Pal, Tapobrata Sarkar | Quantum potential in dust collapse with a negative cosmological constant | 18 pages, Matches published version | null | 10.1016/j.physletb.2021.136269 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the functional Schrodinger formalism, we obtain the wave function
describing collapsing dust in an anti-de Sitter background, as seen by a
co-moving observer, by mapping the resulting variable mass Schrodinger equation
to that of the quantum isotonic oscillator. Using this wave function, we
perform a causal de Bro... | [
{
"created": "Tue, 21 Jul 2020 17:43:02 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 2021 15:56:10 GMT",
"version": "v2"
}
] | 2021-06-15 | [
[
"Chowdhury",
"Sandip",
""
],
[
"Pal",
"Kunal",
""
],
[
"Pal",
"Kuntal",
""
],
[
"Sarkar",
"Tapobrata",
""
]
] | In the functional Schrodinger formalism, we obtain the wave function describing collapsing dust in an anti-de Sitter background, as seen by a co-moving observer, by mapping the resulting variable mass Schrodinger equation to that of the quantum isotonic oscillator. Using this wave function, we perform a causal de Brogl... |
1104.5116 | Bijan Saha Dr. | Bijan Saha | Nonlinear spinor field in Bianchi type-II spacetime | 5 pages | Open Nucl.Part.Phys.J.4 (2011) 1 - 3 | 10.2174/1874415X01104010001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the scope of a Bianchi type-II (BII) cosmological model we study the
role of a nonlinear spinor field in the evolution of the Universe. The system
allows exact solutions only for some special choice of spinor field
nonlinearity.
| [
{
"created": "Wed, 27 Apr 2011 11:39:33 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Saha",
"Bijan",
""
]
] | Within the scope of a Bianchi type-II (BII) cosmological model we study the role of a nonlinear spinor field in the evolution of the Universe. The system allows exact solutions only for some special choice of spinor field nonlinearity. |
1012.2867 | Matt Visser | Gabriel Abreu (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Entropy bounds for uncollapsed rotating bodies | V1:14 pages. V2: 15 pages; minor changes/additions/clarifications.
This version accepted for publication in JHEP | JHEP 1103:056,2011 | 10.1007/JHEP03(2011)056 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Entropy bounds in black hole physics, based on a wide variety of different
approaches, have had a long and distinguished history. Recently the current
authors have turned attention to uncollapsed systems and obtained a robust
entropy bound for uncollapsed static spherically symmetric configurations. In
the current ar... | [
{
"created": "Mon, 13 Dec 2010 21:00:09 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Mar 2011 02:08:45 GMT",
"version": "v2"
}
] | 2011-03-18 | [
[
"Abreu",
"Gabriel",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Entropy bounds in black hole physics, based on a wide variety of different approaches, have had a long and distinguished history. Recently the current authors have turned attention to uncollapsed systems and obtained a robust entropy bound for uncollapsed static spherically symmetric configurations. In the current arti... |
2004.14172 | Maria Churilova | M. S. Churilova | Quasinormal modes of the test fields in the novel 4D
Einstein-Gauss-Bonnet-de Sitter gravity | 8 pages, 5 figures, revtex4-1. arXiv admin note: text overlap with
arXiv:2004.00513 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The regularization proposed in [D.~Glavan and C.~Lin, Phys.\ Rev.\ Lett.\
{\bf 124}, 081301 (2020)] led to the black hole solutions which turned out to
be the solutions of the consistent well-defined $4$-dimensional
Einstein-Gauss-Bonnet theory of gravity suggested in [K.~Aoki, M.~Gorji and
S.~Mukohyama, arXiv:2005.0... | [
{
"created": "Sat, 25 Apr 2020 15:55:55 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Aug 2020 16:51:17 GMT",
"version": "v2"
}
] | 2020-08-18 | [
[
"Churilova",
"M. S.",
""
]
] | The regularization proposed in [D.~Glavan and C.~Lin, Phys.\ Rev.\ Lett.\ {\bf 124}, 081301 (2020)] led to the black hole solutions which turned out to be the solutions of the consistent well-defined $4$-dimensional Einstein-Gauss-Bonnet theory of gravity suggested in [K.~Aoki, M.~Gorji and S.~Mukohyama, arXiv:2005.038... |
2305.09707 | Pardyumn Kumar Sahoo | Sai Swagat Mishra, Sanjay Mandal, P.K. Sahoo | Constraining $f(T,\mathcal{T})$ Gravity with Gravitational Baryogenesis | PLB published version | Physics Letters B, 842 (2023) 137959 | 10.1016/j.physletb.2023.137959 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Gravitational baryogenesis is one of the mechanisms which help us to explore
more about our early universe, especially baryon-anti-baryon asymmetry. As we
know, modified theories of gravity are very successful in describing the
present accelerated scenario of the universe. Therefore, in this letter, we aim
to constra... | [
{
"created": "Tue, 16 May 2023 15:45:44 GMT",
"version": "v1"
}
] | 2023-05-23 | [
[
"Mishra",
"Sai Swagat",
""
],
[
"Mandal",
"Sanjay",
""
],
[
"Sahoo",
"P. K.",
""
]
] | Gravitational baryogenesis is one of the mechanisms which help us to explore more about our early universe, especially baryon-anti-baryon asymmetry. As we know, modified theories of gravity are very successful in describing the present accelerated scenario of the universe. Therefore, in this letter, we aim to constrain... |
1708.05048 | Aleksandr Zheltukhin | A. A. Zheltukhin | Inflation versus collapse in brane matter | 12 pages, version accepted for publication; references and comments
added to Summary; typos corrected | Mod. Phys. Lett. A, Vol. 32, No. 36 (2017) 1750199 | 10.1142/S0217732317501991 | NORDITA-2017-070 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mapping of fundamental branes to their worldsheet (ws) multiplets originating
from spontaneous breaking of the Poincare symmetry is studied. The interaction
Lagrangian for fields of the Nambu-Goldstone multiplet is shown to encode $R^2$
gravity on the ws. The power law $k_{p}\sim T_{p}^{\frac{3-p}{2(p+1)}}$ for the
S... | [
{
"created": "Wed, 16 Aug 2017 19:43:13 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2017 20:08:03 GMT",
"version": "v2"
}
] | 2017-11-16 | [
[
"Zheltukhin",
"A. A.",
""
]
] | Mapping of fundamental branes to their worldsheet (ws) multiplets originating from spontaneous breaking of the Poincare symmetry is studied. The interaction Lagrangian for fields of the Nambu-Goldstone multiplet is shown to encode $R^2$ gravity on the ws. The power law $k_{p}\sim T_{p}^{\frac{3-p}{2(p+1)}}$ for the SO(... |
2111.00726 | Titus K Mathew | Hassan Basari V. T., P. B. Krishna and Titus K. Mathew | Emergence of space from non-equilibrium thermodynamics in f(R) gravity | 19 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has shown that the accelerated expansion of the FRW Universe can be
explained as the quest towards the holographic equipartition ($N_{sur} =
N_{bulk}$), satisfies the expansion law $\frac{dV}{dt} = l_{P}^{2} \left(
N_{sur} - \epsilon N_{bulk} \right)$, from which one can derive the Friedmann
equation of the FRW Un... | [
{
"created": "Mon, 1 Nov 2021 06:54:26 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Nov 2021 06:46:47 GMT",
"version": "v2"
}
] | 2021-11-23 | [
[
"T.",
"Hassan Basari V.",
""
],
[
"Krishna",
"P. B.",
""
],
[
"Mathew",
"Titus K.",
""
]
] | It has shown that the accelerated expansion of the FRW Universe can be explained as the quest towards the holographic equipartition ($N_{sur} = N_{bulk}$), satisfies the expansion law $\frac{dV}{dt} = l_{P}^{2} \left( N_{sur} - \epsilon N_{bulk} \right)$, from which one can derive the Friedmann equation of the FRW Univ... |
1808.01903 | Hossein Mohseni Sadjadi | H. Mohseni Sadjadi and V. Anari | Cosmic acceleration and de Sitter expansion in hybrid mass varying
neutrino model | 19 pages, 6 figures, explanations added | JCAP10(2018)036 | 10.1088/1475-7516/2018/10/036 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A nonminimally coupled hybrid dark energy model is introduced. The dark
energy evolution is triggered by mass varying neutrinos. Quintessence evolution
begins from an initial point, with an insignificant dark energy density, and
arrives at a final de Sitter attractor. While initially, for a Higgs-like
potential, the ... | [
{
"created": "Thu, 2 Aug 2018 15:15:18 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Sep 2018 13:22:31 GMT",
"version": "v2"
}
] | 2019-04-23 | [
[
"Sadjadi",
"H. Mohseni",
""
],
[
"Anari",
"V.",
""
]
] | A nonminimally coupled hybrid dark energy model is introduced. The dark energy evolution is triggered by mass varying neutrinos. Quintessence evolution begins from an initial point, with an insignificant dark energy density, and arrives at a final de Sitter attractor. While initially, for a Higgs-like potential, the no... |
gr-qc/0601105 | Gilberto Medeiros Kremer | J. B. Binder and G. M. Kremer | Model for a Universe described by a non-minimally coupled scalar field
and interacting dark matter | 11 pages and 6 figures. To appear in GRG | Gen.Rel.Grav. 38 (2006) 857-870 | 10.1007/s10714-006-0268-3 | null | gr-qc | null | In this work it is investigated the evolution of a Universe where a scalar
field, non-minimally coupled to space-time curvature, plays the role of
quintessence and drives the Universe to a present accelerated expansion. A
non-relativistic dark matter constituent that interacts directly with dark
energy is also consid... | [
{
"created": "Wed, 25 Jan 2006 14:18:50 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Binder",
"J. B.",
""
],
[
"Kremer",
"G. M.",
""
]
] | In this work it is investigated the evolution of a Universe where a scalar field, non-minimally coupled to space-time curvature, plays the role of quintessence and drives the Universe to a present accelerated expansion. A non-relativistic dark matter constituent that interacts directly with dark energy is also consider... |
gr-qc/0303038 | Kerstin Kunze | Kerstin E. Kunze | T-Duality and Penrose limits of spatially homogeneous and inhomogeneous
cosmologies | 16 pages, 4 figures. Discussion on non-abelian T-duality expanded | Phys.Rev. D68 (2003) 063517 | 10.1103/PhysRevD.68.063517 | null | gr-qc hep-th | null | Penrose limits of inhomogeneous cosmologies admitting two abelian Killing
vectors and their abelian T-duals are found in general. The wave profiles of
the resulting plane waves are given for particular solutions. Abelian and
non-abelian T-duality are used as solution generating techniques. Furthermore,
it is found th... | [
{
"created": "Mon, 10 Mar 2003 12:55:31 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Apr 2003 16:26:34 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kunze",
"Kerstin E.",
""
]
] | Penrose limits of inhomogeneous cosmologies admitting two abelian Killing vectors and their abelian T-duals are found in general. The wave profiles of the resulting plane waves are given for particular solutions. Abelian and non-abelian T-duality are used as solution generating techniques. Furthermore, it is found that... |
2202.00209 | Carlos Eduardo Gabarrete Fajardo | Carlos Gabarrete and Olivier Sarbach | Kinetic gas disks surrounding Schwarzschild black holes | 7 pages, 6 figures, prepared for the Proceedings of the 7th
Conference of the Polish Society on Relativity | Acta Phys. Pol. B Proc. Suppl. 15, 1-A10 (2022), published online:
2022-01-31 | 10.5506/APhysPolBSupp.15.1-A10 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We describe stationary and axisymmetric gas configurations surrounding black
holes. They consist of a collisionless relativistic kinetic gas of identical
massive particles following bound orbits in a Schwarzschild exterior spacetime
and are modeled by a one-particle distribution function which is the product of
a fun... | [
{
"created": "Tue, 1 Feb 2022 04:14:28 GMT",
"version": "v1"
}
] | 2022-02-02 | [
[
"Gabarrete",
"Carlos",
""
],
[
"Sarbach",
"Olivier",
""
]
] | We describe stationary and axisymmetric gas configurations surrounding black holes. They consist of a collisionless relativistic kinetic gas of identical massive particles following bound orbits in a Schwarzschild exterior spacetime and are modeled by a one-particle distribution function which is the product of a funct... |
1802.04264 | Hal Haggard | Eugenio Bianchi, Marios Christodoulou, Fabio D'Ambrosio, Hal M.
Haggard, Carlo Rovelli | White Holes as Remnants: A Surprising Scenario for the End of a Black
Hole | 12 pages, 8 figures, references added | null | 10.1088/1361-6382/aae550 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum tunneling of a black hole into a white hole provides a model for the
full life cycle of a black hole. The white hole acts as a long-lived remnant,
solving the black-hole information paradox. The remnant solution of the paradox
has long been viewed with suspicion, mostly because remnants seemed to be such
exot... | [
{
"created": "Mon, 12 Feb 2018 17:24:41 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Mar 2018 16:53:19 GMT",
"version": "v2"
}
] | 2018-11-14 | [
[
"Bianchi",
"Eugenio",
""
],
[
"Christodoulou",
"Marios",
""
],
[
"D'Ambrosio",
"Fabio",
""
],
[
"Haggard",
"Hal M.",
""
],
[
"Rovelli",
"Carlo",
""
]
] | Quantum tunneling of a black hole into a white hole provides a model for the full life cycle of a black hole. The white hole acts as a long-lived remnant, solving the black-hole information paradox. The remnant solution of the paradox has long been viewed with suspicion, mostly because remnants seemed to be such exotic... |
1709.05329 | Aur\'elien Hees | A. Hees, C. Le Poncin-Lafitte, D. Hestroffer and P. David | Local tests of gravitation with Gaia observations of Solar System
Objects | 4 pages, 1 figure, proceedings of IAU symposium 330 | null | 10.1017/S1743921317005907 | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this proceeding, we show how observations of Solar System Objects with
Gaia can be used to test General Relativity and to constrain modified
gravitational theories. The high number of Solar System objects observed and
the variety of their orbital parameters associated with the impressive
astrometric accuracy will ... | [
{
"created": "Fri, 15 Sep 2017 17:49:53 GMT",
"version": "v1"
}
] | 2018-06-13 | [
[
"Hees",
"A.",
""
],
[
"Poncin-Lafitte",
"C. Le",
""
],
[
"Hestroffer",
"D.",
""
],
[
"David",
"P.",
""
]
] | In this proceeding, we show how observations of Solar System Objects with Gaia can be used to test General Relativity and to constrain modified gravitational theories. The high number of Solar System objects observed and the variety of their orbital parameters associated with the impressive astrometric accuracy will al... |
2407.03626 | Juan M. Z\'arate Pretel | Juan M. Z. Pretel | Moment of inertia and compactness of quark stars within the context of
$f(R,T,L_m)$ gravity | 14 pages, 7 figures and 1 table | Phys. Scr. 99 (2024) 085001 | 10.1088/1402-4896/ad5ac4 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the metric formalism of $f(R,T,L_m)$ gravity theories, we investigate
the hydrostatic equilibrium structure of compact stars taking into account both
isotropic and anisotropic pressure. For this purpose, we focus on the
$f(R,T,L_m)= R+ \alpha TL_m$ model, where $\alpha$ is a free parameter. We
derive the modif... | [
{
"created": "Thu, 4 Jul 2024 04:27:33 GMT",
"version": "v1"
}
] | 2024-07-08 | [
[
"Pretel",
"Juan M. Z.",
""
]
] | Within the metric formalism of $f(R,T,L_m)$ gravity theories, we investigate the hydrostatic equilibrium structure of compact stars taking into account both isotropic and anisotropic pressure. For this purpose, we focus on the $f(R,T,L_m)= R+ \alpha TL_m$ model, where $\alpha$ is a free parameter. We derive the modifie... |
0903.0867 | Mohammad Reza Setare | M R Setare, J Sadeghi, A R Amani | Interacting tachyon dark energy in non-flat universe | 10 pages, 2 figures. Version to appear in PLB (2009) | Phys.Lett.B673:241-246,2009 | 10.1016/j.physletb.2009.02.041 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the tachyon cosmology in non-interacting and
interacting cases in non-flat FRW universe. Then we reconstruct the potential
and the dynamics of the tachyon field which describe tachyon cosmology.
| [
{
"created": "Thu, 5 Mar 2009 14:57:26 GMT",
"version": "v1"
}
] | 2010-03-12 | [
[
"Setare",
"M R",
""
],
[
"Sadeghi",
"J",
""
],
[
"Amani",
"A R",
""
]
] | In this paper we study the tachyon cosmology in non-interacting and interacting cases in non-flat FRW universe. Then we reconstruct the potential and the dynamics of the tachyon field which describe tachyon cosmology. |
gr-qc/9712065 | Hisa-aki Shinkai | Jayashree Balakrishna and Hisa-aki Shinkai (Washington Univ.,
St.Louis) | Dynamical evolution of boson stars in Brans-Dicke theory | 13 pages by RevTeX, epsf.sty, 16 figures, comments added, refs
updated, to appear in Phys. Rev. D | Phys.Rev. D58 (1998) 044016 | 10.1103/PhysRevD.58.044016 | null | gr-qc | null | We study the dynamics of a self-gravitating scalar field solitonic object
(boson star) in the Jordan-Brans-Dicke (BD) theory of gravity. We show
dynamical processes of this system such as (i) black hole formation of
perturbed equilibrium configuration on an unstable branch; (ii) migration of
perturbed equilibrium con... | [
{
"created": "Mon, 15 Dec 1997 20:11:01 GMT",
"version": "v1"
},
{
"created": "Thu, 7 May 1998 17:25:36 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Balakrishna",
"Jayashree",
"",
"Washington Univ.,\n St.Louis"
],
[
"Shinkai",
"Hisa-aki",
"",
"Washington Univ.,\n St.Louis"
]
] | We study the dynamics of a self-gravitating scalar field solitonic object (boson star) in the Jordan-Brans-Dicke (BD) theory of gravity. We show dynamical processes of this system such as (i) black hole formation of perturbed equilibrium configuration on an unstable branch; (ii) migration of perturbed equilibrium confi... |
gr-qc/9909036 | Madhavan Varadarajan | J. Fernando Barbero (Universidad Europa de Madrid) and Madhavan
Varadarajan (R.R.I.) | A Comment on the Degrees of Freedom in the Ashtekar Formulation for 2+1
Gravity | 6 pages LaTex, to appear in Classical and Quantum Gravity | Class.Quant.Grav.16:3765-3768,1999 | 10.1088/0264-9381/16/11/401 | null | gr-qc hep-th | null | We show that the recent claim that the 2+1 dimensional Ashtekar formulation
for General Relativity has a finite number of physical degrees of freedom is
not correct.
| [
{
"created": "Fri, 10 Sep 1999 10:01:51 GMT",
"version": "v1"
}
] | 2017-03-24 | [
[
"Barbero",
"J. Fernando",
"",
"Universidad Europa de Madrid"
],
[
"Varadarajan",
"Madhavan",
"",
"R.R.I."
]
] | We show that the recent claim that the 2+1 dimensional Ashtekar formulation for General Relativity has a finite number of physical degrees of freedom is not correct. |
gr-qc/9710089 | Sean Hayward | Sean A. Hayward | Unified first law of black-hole dynamics and relativistic thermodynamics | 18 pages, TeX, expanded somewhat, to appear in Class. Quantum Grav | Class.Quant.Grav.15:3147-3162,1998 | 10.1088/0264-9381/15/10/017 | null | gr-qc | null | A unified first law of black-hole dynamics and relativistic thermodynamics is
derived in spherically symmetric general relativity. This equation expresses
the gradient of the active gravitational energy E according to the Einstein
equation, divided into energy-supply and work terms. Projecting the equation
along the ... | [
{
"created": "Mon, 20 Oct 1997 06:55:06 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 1998 05:48:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hayward",
"Sean A.",
""
]
] | A unified first law of black-hole dynamics and relativistic thermodynamics is derived in spherically symmetric general relativity. This equation expresses the gradient of the active gravitational energy E according to the Einstein equation, divided into energy-supply and work terms. Projecting the equation along the fl... |
1005.0537 | Anil Yadav dr | Anil Kumar Yadav | Bianchi Type I Anisotropic Universe without Big Smash Driven by Law of
Variation of Hubble's Parameter | 8 pages, To be published in Rom. J. Phys | Rom.J.Phys. 56:609-615,2011 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spatially homogeneous and anisotropic Bianchi Type I universe has been
studied with {\omega} <-1 without Big Smash. It is demonstrated that if cosmic
dark energy behaves like a fluid with equation of state p = {\omega}{\rho} (p
and {\rho} being pressure and energy density respectively) as well as
generalized chaply... | [
{
"created": "Tue, 4 May 2010 14:21:11 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Yadav",
"Anil Kumar",
""
]
] | A spatially homogeneous and anisotropic Bianchi Type I universe has been studied with {\omega} <-1 without Big Smash. It is demonstrated that if cosmic dark energy behaves like a fluid with equation of state p = {\omega}{\rho} (p and {\rho} being pressure and energy density respectively) as well as generalized chaplygi... |
1405.6436 | Artyom Yurov | A. V. Yaparova, A. V. Yurov and V. A. Yurov | The KdV in Cosmology: a useful tool or a distraction? | 6 pages. Acknowledgment is added | Grav.Cosmol. 21 (2015) no.2, 166-170 | 10.1134/S0202289315020127 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The letter is a response to the recent article by J. Lidsey. We demonstrate
that the Schwarzian derivative technique developed therein is but a consequence
of linearizabiliy of the original cosmological equations. Furthermore, we show
the required linearized equation to be nothing else but a Schr\"odinger
equation.
| [
{
"created": "Sun, 25 May 2014 23:00:21 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jun 2014 14:41:21 GMT",
"version": "v2"
}
] | 2019-07-30 | [
[
"Yaparova",
"A. V.",
""
],
[
"Yurov",
"A. V.",
""
],
[
"Yurov",
"V. A.",
""
]
] | The letter is a response to the recent article by J. Lidsey. We demonstrate that the Schwarzian derivative technique developed therein is but a consequence of linearizabiliy of the original cosmological equations. Furthermore, we show the required linearized equation to be nothing else but a Schr\"odinger equation. |
0904.4195 | James Lindesay | James Lindesay | Quantum Behaviors and Dynamic Horizons | Invited talk presented at the 2009 Joint Annual Conference of the
National Society of Black Physicists and the National Society of Hispanic
Physicists, Feb. 10-14, Nashville, Tennessee | AIP Conf.Proc.1280:28-56,2010 | 10.1063/1.3507199 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geometries with horizons offer insights into relationships between general
relativity and quantum physics. Quantum mechanics constrains relationships
between kinematic parameters and the coordinates describing the dynamics.
Example quantum behaviors on space-times with dynamic horizons will be
demonstrated, with an e... | [
{
"created": "Mon, 27 Apr 2009 15:50:02 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Lindesay",
"James",
""
]
] | Geometries with horizons offer insights into relationships between general relativity and quantum physics. Quantum mechanics constrains relationships between kinematic parameters and the coordinates describing the dynamics. Example quantum behaviors on space-times with dynamic horizons will be demonstrated, with an emp... |
1507.04919 | Alessandro Brillante | Alessandro Brillante, Igor Mishustin | Nonlinear oscillations of compact stars in the vicinity of the maximum
mass configuration | 15 pages, 8 figures, accepted for publication in EPL | EPL 111, 29001 (2015) | 10.1209/0295-5075/111/29001 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We solve the dynamical GR equations for the spherically symmetric evolution
of compact stars in the vicinity of the maximum mass, for which instability
sets in according to linear perturbation theory. The calculations are done with
the analytical Zeldovich-like EOS P=a(rho-rho_0) and with the TM1
parametrisation of t... | [
{
"created": "Fri, 17 Jul 2015 10:56:13 GMT",
"version": "v1"
}
] | 2015-08-06 | [
[
"Brillante",
"Alessandro",
""
],
[
"Mishustin",
"Igor",
""
]
] | We solve the dynamical GR equations for the spherically symmetric evolution of compact stars in the vicinity of the maximum mass, for which instability sets in according to linear perturbation theory. The calculations are done with the analytical Zeldovich-like EOS P=a(rho-rho_0) and with the TM1 parametrisation of the... |
gr-qc/9712095 | Shingo Suzuki | Shingo Suzuki and Kei-ichi Maeda | Innermost Stable Circular Orbit of a Spinning Particle in Kerr Spacetime | 25 pages including 8 figures | Phys.Rev. D58 (1998) 023005 | 10.1103/PhysRevD.58.023005 | null | gr-qc | null | We study stability of a circular orbit of a spinning test particle in a Kerr
spacetime. We find that some of the circular orbits become unstable in the
direction perpendicular to the equatorial plane, although the orbits are still
stable in the radial direction. Then for the large spin case ($S < \sim O(1)),
the inne... | [
{
"created": "Fri, 26 Dec 1997 09:48:10 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Suzuki",
"Shingo",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We study stability of a circular orbit of a spinning test particle in a Kerr spacetime. We find that some of the circular orbits become unstable in the direction perpendicular to the equatorial plane, although the orbits are still stable in the radial direction. Then for the large spin case ($S < \sim O(1)), the innerm... |
0909.5539 | Francisco Lobo | Francisco S. N. Lobo, Miguel A. Oliveira | Wormhole geometries in f(R) modified theories of gravity | 9 pages, 4 figures. V2: References and discussion on Brans-Dicke
wormholes added, to appear in Phys.Rev.D | Phys.Rev.D80:104012,2009 | 10.1103/PhysRevD.80.104012 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we construct traversable wormhole geometries in the context of
f(R) modified theories of gravity. We impose that the matter threading the
wormhole satisfies the energy conditions, so that it is the effective
stress-energy tensor containing higher order curvature derivatives that is
responsible for the n... | [
{
"created": "Wed, 30 Sep 2009 17:06:35 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Oct 2009 05:45:01 GMT",
"version": "v2"
}
] | 2009-11-12 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Oliveira",
"Miguel A.",
""
]
] | In this work, we construct traversable wormhole geometries in the context of f(R) modified theories of gravity. We impose that the matter threading the wormhole satisfies the energy conditions, so that it is the effective stress-energy tensor containing higher order curvature derivatives that is responsible for the nul... |
2009.12988 | Francisco Lobo | Khadije Jafarzade, Mahdi Kord Zangeneh, Francisco S. N. Lobo | Optical features of AdS black holes in the novel 4D
Einstein-Gauss-Bonnet gravity coupled to nonlinear electrodynamics | 11 pages, 5 figures. V2: references added. V3: 20 pages, 5 figures;
significant discussion and references added; matches published version, using
MDPI style | Universe 2022, 8(3), 182 | 10.3390/universe8030182 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An alternative theory of gravity that has attracted much attention recently
is the novel four-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity. The
theory is rescaled by the Gauss-Bonnet (GB) coupling constant $\alpha
\rightarrow \alpha/(D - 4)$ in $ D $ dimensions and redefined as
four-dimensional gravity in the l... | [
{
"created": "Mon, 28 Sep 2020 00:14:00 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2020 20:03:18 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Mar 2022 11:33:37 GMT",
"version": "v3"
}
] | 2022-03-25 | [
[
"Jafarzade",
"Khadije",
""
],
[
"Zangeneh",
"Mahdi Kord",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | An alternative theory of gravity that has attracted much attention recently is the novel four-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity. The theory is rescaled by the Gauss-Bonnet (GB) coupling constant $\alpha \rightarrow \alpha/(D - 4)$ in $ D $ dimensions and redefined as four-dimensional gravity in the lim... |
1906.08248 | T. P. Singh | Tejinder P. Singh | Proposal for a new quantum theory of gravity II: Spectral equation of
motion for the atom of space-time-matter | v3: 7 pages, refs. updated; this paper is follow-up of
arXiv:1903.05402v2 [gr-qc]; to appear in Zeitschrift f\"ur Naturforschung A -
A Journal of Physical Sciences | Z. Naturforsch. A 74 (2019) 989 | 10.1515/zna-2019-0211 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the first paper of this series, we have introduced the concept of an atom
of space-time-matter [STM], which is described by the spectral action of
non-commutative geometry, corresponding to a classical theory of gravity. In
the present work, we use the Connes time parameter along with the spectral
action, to incor... | [
{
"created": "Wed, 19 Jun 2019 17:48:52 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jun 2019 04:55:01 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jul 2019 15:07:48 GMT",
"version": "v3"
}
] | 2019-11-11 | [
[
"Singh",
"Tejinder P.",
""
]
] | In the first paper of this series, we have introduced the concept of an atom of space-time-matter [STM], which is described by the spectral action of non-commutative geometry, corresponding to a classical theory of gravity. In the present work, we use the Connes time parameter along with the spectral action, to incorpo... |
1806.09336 | Patric H\"olscher | Patric H\"olscher | Gravitational Waves and Degrees of Freedom in Higher Derivative Gravity | v4: 8 pages, no figures; Uses REVTeX 4.1; improved notation and
additional comments/clarifications; updated references | Phys. Rev. D 99, 064039 (2019) | 10.1103/PhysRevD.99.064039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the degrees of freedom of the metric in a general class of higher
derivative gravity models, which are interesting in the context of quantum
gravity as they are (super)renormalizable. First, we linearize the theory for a
flat background metric in Teyssandier gauge for an arbitrary number of
spacetime dimensi... | [
{
"created": "Mon, 25 Jun 2018 09:08:12 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2018 18:29:28 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Oct 2018 09:43:55 GMT",
"version": "v3"
},
{
"created": "Thu, 4 Apr 2019 09:21:38 GMT",
"version": "v4"
}
] | 2019-04-05 | [
[
"Hölscher",
"Patric",
""
]
] | We study the degrees of freedom of the metric in a general class of higher derivative gravity models, which are interesting in the context of quantum gravity as they are (super)renormalizable. First, we linearize the theory for a flat background metric in Teyssandier gauge for an arbitrary number of spacetime dimension... |
gr-qc/0504117 | Shahram Jalalzadeh | S. Mirabotalebi, S. Jalalzadeh, S. Movahed and H. R. Sepangi | Weyl-Dirac theory predictions on galactic scales | 16 pages, 1 figures, 4 tables, to appear in MNRAS | Mon. Not. Roy. Astron. Soc.385:385,2008 | null | null | gr-qc astro-ph | null | We consider the Weyl-Dirac theory within the framework of the weak field
approximation and show that the resulting gravitational potential differs from
that of Newtonian by a repulsive correction term increasing with distance. The
scale of the correction term appears to be determined by the time variation
rate of the... | [
{
"created": "Sun, 24 Apr 2005 10:36:26 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Oct 2005 10:21:56 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Jan 2008 14:13:22 GMT",
"version": "v3"
}
] | 2010-11-19 | [
[
"Mirabotalebi",
"S.",
""
],
[
"Jalalzadeh",
"S.",
""
],
[
"Movahed",
"S.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We consider the Weyl-Dirac theory within the framework of the weak field approximation and show that the resulting gravitational potential differs from that of Newtonian by a repulsive correction term increasing with distance. The scale of the correction term appears to be determined by the time variation rate of the g... |
1505.00225 | Jinsong Yang | Jinsong Yang, Yongge Ma | Graphical method in loop quantum gravity: II. The Hamiltonian constraint
and inverse volume operators | 18 pages; a few modifications | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the second paper in the series to introduce a graphical method to
loop quantum gravity. We employ the graphical method as a powerful tool to
calculate the actions of the Euclidean Hamiltonian constraint operator and the
so-called inverse volume operator on spin network states with trivalent
vertices. Both of ... | [
{
"created": "Fri, 1 May 2015 17:20:48 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 2015 15:05:58 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Feb 2016 04:40:17 GMT",
"version": "v3"
}
] | 2016-02-25 | [
[
"Yang",
"Jinsong",
""
],
[
"Ma",
"Yongge",
""
]
] | This is the second paper in the series to introduce a graphical method to loop quantum gravity. We employ the graphical method as a powerful tool to calculate the actions of the Euclidean Hamiltonian constraint operator and the so-called inverse volume operator on spin network states with trivalent vertices. Both of th... |
2012.09180 | Maria-Jose Guzman | Daniel Blixt, Mar\'ia-Jos\'e Guzm\'an, Manuel Hohmann, Christian
Pfeifer | Review of the Hamiltonian analysis in teleparallel gravity | 36 pages, 2 tables, 1 figure; matches the published version | Int. J. Geom. Methods Mod. Phys., Vol. 18, No. supp01, 2130005
(2021) | 10.1142/S0219887821300051 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We review different approaches to the Hamiltonian analysis of teleparallel
theories of gravity. In particular the Hamiltonian analysis for $f(\mathbb{T})$
theories led to disputed results in the literature. The aim of this review is
to relate the different notations and assumptions in the different approaches
in a co... | [
{
"created": "Wed, 16 Dec 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Sep 2021 12:15:22 GMT",
"version": "v2"
}
] | 2021-09-13 | [
[
"Blixt",
"Daniel",
""
],
[
"Guzmán",
"María-José",
""
],
[
"Hohmann",
"Manuel",
""
],
[
"Pfeifer",
"Christian",
""
]
] | We review different approaches to the Hamiltonian analysis of teleparallel theories of gravity. In particular the Hamiltonian analysis for $f(\mathbb{T})$ theories led to disputed results in the literature. The aim of this review is to relate the different notations and assumptions in the different approaches in a comp... |
gr-qc/0504089 | Andrzej Woszczyna | Marek Demianski, Zdzislaw A. Golda, Andrzej Woszczyna | Evolution of density perturbations in a realistic universe | 19 pages, 4 figures | Gen.Rel.Grav. 37 (2005) 2063-2082 | 10.1007/s10714-005-0180-2 | null | gr-qc | null | Prompted by the recent more precise determination of the basic cosmological
parameters and growing evidence that the matter-energy content of the universe
is now dominated by dark energy and dark matter we present the general solution
of the equation that describes the evolution of density perturbations in the
linear... | [
{
"created": "Wed, 20 Apr 2005 10:32:29 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Demianski",
"Marek",
""
],
[
"Golda",
"Zdzislaw A.",
""
],
[
"Woszczyna",
"Andrzej",
""
]
] | Prompted by the recent more precise determination of the basic cosmological parameters and growing evidence that the matter-energy content of the universe is now dominated by dark energy and dark matter we present the general solution of the equation that describes the evolution of density perturbations in the linear a... |
gr-qc/0311012 | Sisir Roy | S. Roy | Planck Scale Physics, Pregeometry and the Notion of Time | 14 pages, Invited talk at advanced NATO school, Tratanska, 2002 | Kluwer Academic Publishers, 2003 | null | null | gr-qc | null | Recent progress in quantum gravity and string theory has raised interest
among scientists to whether or not nature behaves discretely at the Planck
scale. There are two attitudes twoards this discretenes i.e. top-down and
bottom-up approach. We have followed up the bottom-up approach. Here we have
tried to describe h... | [
{
"created": "Tue, 4 Nov 2003 20:31:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Roy",
"S.",
""
]
] | Recent progress in quantum gravity and string theory has raised interest among scientists to whether or not nature behaves discretely at the Planck scale. There are two attitudes twoards this discretenes i.e. top-down and bottom-up approach. We have followed up the bottom-up approach. Here we have tried to describe how... |
gr-qc/0206050 | Juan A. Valiente-Kroon | J.A. Valiente Kroon | Early radiative properties of the developments of time symmetric,
conformally flat initial data | Revtex, 5 pages | Class.Quant.Grav. 20 (2003) L53-L60 | 10.1088/0264-9381/20/5/102 | null | gr-qc | null | Using a representation of spatial infinity based in the properties of
conformal geodesics, the first terms of an expansion for the Bondi mass for the
development of time symmetric, conformally flat initial data are calculated. As
it is to be expected, the Bondi mass agrees with the ADM at the sets where null
infinity... | [
{
"created": "Tue, 18 Jun 2002 11:29:17 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Kroon",
"J. A. Valiente",
""
]
] | Using a representation of spatial infinity based in the properties of conformal geodesics, the first terms of an expansion for the Bondi mass for the development of time symmetric, conformally flat initial data are calculated. As it is to be expected, the Bondi mass agrees with the ADM at the sets where null infinity `... |
2107.11054 | Beatriz Elizaga Navascu\'es | Beatriz Elizaga Navascu\'es, Guillermo A. Mena Marug\'an, and Santiago
Prado | Non-oscillating vacuum states and the quantum homogeneity and isotropy
hypothesis in Loop Quantum Cosmology | 13 pages, 2 figures. We have corrected a misprint in Eq. (2.12) and
its consequence on Fig. 1 | Phys. Rev. D 104, 083541 (2021) | 10.1103/PhysRevD.104.083541 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the compatibility of the quantum homogeneitiy and isotropy
hypothesis (QHIH), proposed by Ashtekar and Gupt to restrict the choice of
vacuum state for the cosmological perturbations in Loop Quantum Cosmology
(LQC), with the requirement that the selected vacuum should lead to a power
spectrum that does not os... | [
{
"created": "Fri, 23 Jul 2021 07:25:08 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Nov 2021 02:19:50 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Dec 2021 18:37:08 GMT",
"version": "v3"
}
] | 2021-12-30 | [
[
"Navascués",
"Beatriz Elizaga",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
],
[
"Prado",
"Santiago",
""
]
] | We study the compatibility of the quantum homogeneitiy and isotropy hypothesis (QHIH), proposed by Ashtekar and Gupt to restrict the choice of vacuum state for the cosmological perturbations in Loop Quantum Cosmology (LQC), with the requirement that the selected vacuum should lead to a power spectrum that does not osci... |
2302.09135 | Marie Cassing | Marie Cassing, Luciano Rezzolla | Equilibrium non-selfgravitating tori around black holes in parameterised
spherically symmetric spacetimes | 12 pages, 9 figures, version published in MNRAS, essentially no
changes | Monthly Notices of the Royal Astronomical Society, Volume 522,
Issue 2, June 2023, Pages 2415-2428 | 10.1093/mnras/stad1039 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Non-selfgravitating equilibrium tori orbiting around black holes have a long
history and have been employed in numerous simulations of accretion flows onto
black holes and other compact objects. We have revisited the problem of
constructing such equilibria starting from spherically symmetric black-hole
spacetimes exp... | [
{
"created": "Fri, 17 Feb 2023 20:57:38 GMT",
"version": "v1"
},
{
"created": "Fri, 5 May 2023 09:22:34 GMT",
"version": "v2"
}
] | 2023-05-09 | [
[
"Cassing",
"Marie",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | Non-selfgravitating equilibrium tori orbiting around black holes have a long history and have been employed in numerous simulations of accretion flows onto black holes and other compact objects. We have revisited the problem of constructing such equilibria starting from spherically symmetric black-hole spacetimes expre... |
2211.14856 | Robie Hennigar | Maria C. DiMarco, Sierra L. Jess, Robie A. Hennigar, Robert B. Mann | Universality for Black Hole Heat Engines Near Critical Points | 23 pages, 1 figure | null | 10.1103/PhysRevD.107.044001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Johnson has shown [arXiv:1703.06119] that in the vicinity of a critical point
the efficiency of a black hole heat engine can approach the Carnot efficiency
while maintaining finite power. We characterize and extend this result in
several ways, and we show how the rate of approach to the Carnot efficiency is
governed ... | [
{
"created": "Sun, 27 Nov 2022 15:18:55 GMT",
"version": "v1"
}
] | 2023-02-15 | [
[
"DiMarco",
"Maria C.",
""
],
[
"Jess",
"Sierra L.",
""
],
[
"Hennigar",
"Robie A.",
""
],
[
"Mann",
"Robert B.",
""
]
] | Johnson has shown [arXiv:1703.06119] that in the vicinity of a critical point the efficiency of a black hole heat engine can approach the Carnot efficiency while maintaining finite power. We characterize and extend this result in several ways, and we show how the rate of approach to the Carnot efficiency is governed by... |
2009.11319 | Philip Klaus Schwartz | Philip K. Schwartz | Post-Newtonian Description of Quantum Systems in Gravitational Fields | Doctoral thesis. 145 pages (12 front matter + 113 main text + 20 back
matter). Includes material from arXiv:1812.05181, arXiv:1908.06929, and
arXiv:2004.09723. Includes an extended version of the results from
arXiv:1908.06929. v2: included keywords (to match version that will be
published) | null | 10.15488/10085 | null | gr-qc math-ph math.MP physics.atom-ph physics.hist-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis deals with the systematic treatment of quantum-mechanical systems
in post-Newtonian gravitational fields. Starting from clearly spelled-out
assumptions, employing a framework of geometric background structures defining
the notion of a post-Newtonian expansion, our systematic approach allows to
properly de... | [
{
"created": "Wed, 23 Sep 2020 18:03:04 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2020 14:26:44 GMT",
"version": "v2"
}
] | 2020-10-07 | [
[
"Schwartz",
"Philip K.",
""
]
] | This thesis deals with the systematic treatment of quantum-mechanical systems in post-Newtonian gravitational fields. Starting from clearly spelled-out assumptions, employing a framework of geometric background structures defining the notion of a post-Newtonian expansion, our systematic approach allows to properly deri... |
1002.2041 | Peter Dunsby | Bonita de Swardt, Peter K. S. Dunsby and Chris Clarkson | Gravitational Lensing in Spherically Symmetric Spacetimes | 14 pages | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a framework for studying gravitational lensing in spherically
symmetric spacetimes using 1+1+2 covariant methods. A general formula for the
deflection angle is derived and we show how this can be used to recover the
standard result for the Schwarzschild spacetime.
| [
{
"created": "Wed, 10 Feb 2010 09:59:03 GMT",
"version": "v1"
}
] | 2010-02-14 | [
[
"de Swardt",
"Bonita",
""
],
[
"Dunsby",
"Peter K. S.",
""
],
[
"Clarkson",
"Chris",
""
]
] | We present a framework for studying gravitational lensing in spherically symmetric spacetimes using 1+1+2 covariant methods. A general formula for the deflection angle is derived and we show how this can be used to recover the standard result for the Schwarzschild spacetime. |
0709.0660 | Gregory L. Comer | Lap-Ming Lin, N. Andersson, G. L. Comer | Oscillations of General Relativistic Multi-fluid/Multi-layer Compact
Stars | null | Phys.Rev.D78:083008,2008 | 10.1103/PhysRevD.78.083008 | null | gr-qc astro-ph | null | We develop the formalism for determining the quasinormal modes of general
relativistic multi-fluid compact stars in such a way that the impact of
superfluid gap data can be assessed. Our results represent the first attempt to
study true multi-layer dynamics, an important step towards considering
realistic superfluid/... | [
{
"created": "Wed, 5 Sep 2007 14:30:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lin",
"Lap-Ming",
""
],
[
"Andersson",
"N.",
""
],
[
"Comer",
"G. L.",
""
]
] | We develop the formalism for determining the quasinormal modes of general relativistic multi-fluid compact stars in such a way that the impact of superfluid gap data can be assessed. Our results represent the first attempt to study true multi-layer dynamics, an important step towards considering realistic superfluid/su... |
1604.03013 | Mauricio Bellini | Jes\'us Mart\'in Romero, Mauricio Bellini (IFIMAR - CONICET and
UINMDP), Jos\'e Edgar Madriz Aguilar (Departamento de Matem\'aticas, CUCEI,
Universidad de Guadalajara) | Gravitational waves and magnetic monopoles during inflation with
Weitzenb\"ock torsion | Accepted in Phys. Dark Univ | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the variational principle on a Hilbert-Einstein action in an
extended geometry with torsion taking into account non-trivial boundary
conditions. We obtain an effective energy-momentum tensor that has its source
in the torsion, which represents the matter geometrically induced. We explore
about the existence ... | [
{
"created": "Mon, 11 Apr 2016 15:59:29 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2016 00:10:21 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Romero",
"Jesús Martín",
"",
"IFIMAR - CONICET and\n UINMDP"
],
[
"Bellini",
"Mauricio",
"",
"IFIMAR - CONICET and\n UINMDP"
],
[
"Aguilar",
"José Edgar Madriz",
"",
"Departamento de Matemáticas, CUCEI,\n Universidad de Guadalajara"
]
] | We study the variational principle on a Hilbert-Einstein action in an extended geometry with torsion taking into account non-trivial boundary conditions. We obtain an effective energy-momentum tensor that has its source in the torsion, which represents the matter geometrically induced. We explore about the existence of... |
gr-qc/0702034 | Muhammad Sharif | Asghar Qadir, M. Sharif and M. Ziad | Homotheties of Cylindrically Symmetric Static Manifolds and their Global
Extension | 8 pages, no figure | Class. Quantum Grav. 17(2000)345-349 | 10.1088/0264-9381/17/2/305 | null | gr-qc | null | Cylindrically symmetric static manifolds are classified according to their
homotheties and metrics. In each case the homothety vector fields and the
corresponding metrics are obtained explicitly by solving the homothety
equations. It turns out that these metrics admit homothety groups $H_m$, where
$m=4,5,7,11$. This ... | [
{
"created": "Tue, 6 Feb 2007 13:16:47 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Qadir",
"Asghar",
""
],
[
"Sharif",
"M.",
""
],
[
"Ziad",
"M.",
""
]
] | Cylindrically symmetric static manifolds are classified according to their homotheties and metrics. In each case the homothety vector fields and the corresponding metrics are obtained explicitly by solving the homothety equations. It turns out that these metrics admit homothety groups $H_m$, where $m=4,5,7,11$. This cl... |
0812.1399 | Ewa Czuchry | Jerzy Kijowski and Ewa Czuchry | Dynamics of a self gravitating light-like matter shell with spherical
symmetry | 22 pages | Class.Quant.Grav.27:235007,2010 | 10.1088/0264-9381/27/23/235007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel Hamiltonian description of the dynamics of a spherically symmetric,
light-like, self-gravitating shell is presented. It is obtained via the
systematic reduction of the phase space with respect to the Gauss-Codazzi
constraints, model and rare procedure in the Canonical Gravity. The Hamiltonian
of the system (n... | [
{
"created": "Mon, 8 Dec 2008 00:18:01 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2010 18:35:55 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Kijowski",
"Jerzy",
""
],
[
"Czuchry",
"Ewa",
""
]
] | A novel Hamiltonian description of the dynamics of a spherically symmetric, light-like, self-gravitating shell is presented. It is obtained via the systematic reduction of the phase space with respect to the Gauss-Codazzi constraints, model and rare procedure in the Canonical Gravity. The Hamiltonian of the system (num... |
gr-qc/9901039 | Piotr Bizon | Piotr Bizon, Tadeusz Chmaj, and Zbislaw Tabor | On Equivalence of Critical Collapse of Non-Abelian Fields | 7 pages, REVTex, 2 figures included, accepted for publication in
Physical Review D | Phys.Rev. D59 (1999) 104003 | 10.1103/PhysRevD.59.104003 | null | gr-qc | null | We continue our study of the gravitational collapse of spherically symmetric
skyrmions. For certain families of initial data, we find the discretely
self-similar Type II critical transition characterized by the mass scaling
exponent $\gamma \approx 0.20$ and the echoing period $\Delta \approx 0.74$. We
argue that the... | [
{
"created": "Thu, 14 Jan 1999 09:20:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bizon",
"Piotr",
""
],
[
"Chmaj",
"Tadeusz",
""
],
[
"Tabor",
"Zbislaw",
""
]
] | We continue our study of the gravitational collapse of spherically symmetric skyrmions. For certain families of initial data, we find the discretely self-similar Type II critical transition characterized by the mass scaling exponent $\gamma \approx 0.20$ and the echoing period $\Delta \approx 0.74$. We argue that the c... |
1801.01865 | Amit Bhoonah | Amit Bhoonah | Gravitational fermion creation during an anisotropic phase of
cosmological expansion | Accepted for publication in Physical Review D | Phys. Rev. D 99, 105003 (2019) | 10.1103/PhysRevD.99.105003 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The free Dirac equation is solved in a Bianchi Type I space-time, which
represents a homogeneous but anisotropic universe, to show the creation of
fermionic particles. It is found that unlike in the isotropic case, massless
fermion production is possible. An estimate of the energy density of massless
particles create... | [
{
"created": "Fri, 5 Jan 2018 18:34:10 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 2018 18:43:39 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Apr 2019 02:49:57 GMT",
"version": "v3"
}
] | 2019-05-22 | [
[
"Bhoonah",
"Amit",
""
]
] | The free Dirac equation is solved in a Bianchi Type I space-time, which represents a homogeneous but anisotropic universe, to show the creation of fermionic particles. It is found that unlike in the isotropic case, massless fermion production is possible. An estimate of the energy density of massless particles created ... |
2103.03557 | Cunliang Ma | Chao Zhan, Mingzhen Jia, Cunliang Ma, Zhongliang Lu and Wenbin Lin | The response of the Convolutional Neural Network to the transient noise
in Gravitational wave detection | null | null | null | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | In recent years, much work have studied the use of convolutional neural
networks for gravitational-wave detection. However little work pay attention to
whether the transient noise can trigger the CNN model or not. In this paper, we
study the responses of the sine-Gaussian glitches, the Gaussian glitches and
the ring-... | [
{
"created": "Fri, 5 Mar 2021 09:34:49 GMT",
"version": "v1"
}
] | 2021-03-08 | [
[
"Zhan",
"Chao",
""
],
[
"Jia",
"Mingzhen",
""
],
[
"Ma",
"Cunliang",
""
],
[
"Lu",
"Zhongliang",
""
],
[
"Lin",
"Wenbin",
""
]
] | In recent years, much work have studied the use of convolutional neural networks for gravitational-wave detection. However little work pay attention to whether the transient noise can trigger the CNN model or not. In this paper, we study the responses of the sine-Gaussian glitches, the Gaussian glitches and the ring-do... |
1107.4283 | Yvonne Choquet-Bruhat | Yvonne Choquet-Bruhat | Positive Gravitattional Energy in Arbitrary Dimensions | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a streamlined, complete proof, valid in arbitrary space dimension
$n$, and using only spinors on the oriented Riemannian space $(M^{n};g),$ of
the positive energy theorem in General Relativity.
| [
{
"created": "Thu, 21 Jul 2011 14:15:31 GMT",
"version": "v1"
}
] | 2011-07-22 | [
[
"Choquet-Bruhat",
"Yvonne",
""
]
] | We present a streamlined, complete proof, valid in arbitrary space dimension $n$, and using only spinors on the oriented Riemannian space $(M^{n};g),$ of the positive energy theorem in General Relativity. |
2206.05415 | Ashutosh Singh Dr | Ashutosh Singh, Anirudh Pradhan | Qualitative study of anisotropic Rastall cosmologies | 15 Pages, Indian J. Phys. accepted | Indian Journal of Physics, Volume 97, Pages 631-641 (2023) | 10.1007/s12648-022-02406-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform dynamical analysis of anisotropic Rastall cosmologies and, in
particular Kantowski-Sachs, locally rotationally symmetric (LRS) Bianchi I and
LRS Bianchi III cosmologies. Using dynamical system techniques, a qualitative
analysis of cosmological equations yield physically interesting cases which are
in agree... | [
{
"created": "Sat, 11 Jun 2022 04:05:14 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2022 10:39:35 GMT",
"version": "v2"
}
] | 2023-02-01 | [
[
"Singh",
"Ashutosh",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | We perform dynamical analysis of anisotropic Rastall cosmologies and, in particular Kantowski-Sachs, locally rotationally symmetric (LRS) Bianchi I and LRS Bianchi III cosmologies. Using dynamical system techniques, a qualitative analysis of cosmological equations yield physically interesting cases which are in agreeme... |
gr-qc/0312072 | Vladimir Burdyuzha | Vladimir Burdyuzha, J.A.de Freitas Pacheco, Grigory Vereshkov | Structures of gravitational vacuum and their role in the Universe | 11 pages, no figures, LaTeX 2.09. Classical and Quantum Gravity
(submitted) | null | null | Preprint of Lebedev Physical Institute, Russian Academy of Sciences
N9, 2003 | gr-qc | null | The production of gravitational vacuum defects and their contribution in
energy density of the Universe are discussed. These topological microstructures
could be produced as the result of defect creation of the Universe from
"nothing" as well as the result of the first relativistic phase transition.
They must be isot... | [
{
"created": "Tue, 16 Dec 2003 08:26:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burdyuzha",
"Vladimir",
""
],
[
"Pacheco",
"J. A. de Freitas",
""
],
[
"Vereshkov",
"Grigory",
""
]
] | The production of gravitational vacuum defects and their contribution in energy density of the Universe are discussed. These topological microstructures could be produced as the result of defect creation of the Universe from "nothing" as well as the result of the first relativistic phase transition. They must be isotro... |
gr-qc/0309120 | Winfried Zimdahl | Rinat A. Daishev and Winfried Zimdahl | On homothetic cosmological dynamics | 8 pages, to be published in Class. Quantum Grav | Class.Quant.Grav. 20 (2003) 5017-5024 | 10.1088/0264-9381/20/23/005 | null | gr-qc astro-ph hep-ph | null | We consider the homogeneous and isotropic cosmological fluid dynamics which
is compatible with a homothetic, timelike motion, equivalent to an equation of
state $\rho + 3P = 0$. By splitting the total pressure $P$ into the sum of an
equilibrium part $p$ and a non-equilibrium part $\Pi$, we find that on
thermodynamica... | [
{
"created": "Thu, 25 Sep 2003 11:35:14 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Daishev",
"Rinat A.",
""
],
[
"Zimdahl",
"Winfried",
""
]
] | We consider the homogeneous and isotropic cosmological fluid dynamics which is compatible with a homothetic, timelike motion, equivalent to an equation of state $\rho + 3P = 0$. By splitting the total pressure $P$ into the sum of an equilibrium part $p$ and a non-equilibrium part $\Pi$, we find that on thermodynamical ... |
2401.06084 | Saeed Rastgoo | Diego Montalvo, Adam Smith-Orlik, Saeed Rastgoo, Laura Sagunski,
Niklas Becker, Hazkeel Khan | Post-Newtonian effects in compact binaries with a dark matter spike: A
Lagrangian approach | 16 pages, 4 figures | null | null | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simple but powerful Lagrangian method that can be used to study
the post-Newtonian evolution of a compact binary system with environment,
including a dark matter spike, around it, and obtain the resulting
gravitational wave emission. This formalism allows one to incorporate
post-Newtonian effects up to a... | [
{
"created": "Thu, 11 Jan 2024 17:59:40 GMT",
"version": "v1"
}
] | 2024-01-12 | [
[
"Montalvo",
"Diego",
""
],
[
"Smith-Orlik",
"Adam",
""
],
[
"Rastgoo",
"Saeed",
""
],
[
"Sagunski",
"Laura",
""
],
[
"Becker",
"Niklas",
""
],
[
"Khan",
"Hazkeel",
""
]
] | We present a simple but powerful Lagrangian method that can be used to study the post-Newtonian evolution of a compact binary system with environment, including a dark matter spike, around it, and obtain the resulting gravitational wave emission. This formalism allows one to incorporate post-Newtonian effects up to any... |
1704.01648 | Yosef Verbin | Y. Brihaye, Th. Delplace, Y. Verbin | Proca Q Balls and their Coupling to Gravity | revised version; to appear in PRD | Phys. Rev. D 96, 024057 (2017) | 10.1103/PhysRevD.96.024057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extending the Proca Lagrangian of a massive complex-valued vector field by
self-interaction potential, we construct a large class of spherically symmetric
solutions in flat Minkowski background as well as in the self-gravitating case.
Our solutions encompass Proca Q-balls and Proca stars known in the literature,
but ... | [
{
"created": "Wed, 5 Apr 2017 20:41:07 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2017 14:53:22 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Jun 2017 19:11:42 GMT",
"version": "v3"
}
] | 2017-08-09 | [
[
"Brihaye",
"Y.",
""
],
[
"Delplace",
"Th.",
""
],
[
"Verbin",
"Y.",
""
]
] | Extending the Proca Lagrangian of a massive complex-valued vector field by self-interaction potential, we construct a large class of spherically symmetric solutions in flat Minkowski background as well as in the self-gravitating case. Our solutions encompass Proca Q-balls and Proca stars known in the literature, but pr... |
2404.07589 | Sunny Vagnozzi | Davide Pedrotti, Sunny Vagnozzi | See the lightning, hear the thunder: quasinormal modes-shadow
correspondence for rotating regular black holes | 20 pages, 4 figures | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Eikonal quasinormal modes (QNMs) of black holes (BHs) and parameters of null
geodesics, ultimately tied to the appearance of BHs to external observers, are
known to be related, and the eikonal QNM-BH shadow radii correspondence has
been extensively studied for spherically symmetric BHs. The extension to
rotating BHs ... | [
{
"created": "Thu, 11 Apr 2024 09:19:32 GMT",
"version": "v1"
}
] | 2024-04-15 | [
[
"Pedrotti",
"Davide",
""
],
[
"Vagnozzi",
"Sunny",
""
]
] | Eikonal quasinormal modes (QNMs) of black holes (BHs) and parameters of null geodesics, ultimately tied to the appearance of BHs to external observers, are known to be related, and the eikonal QNM-BH shadow radii correspondence has been extensively studied for spherically symmetric BHs. The extension to rotating BHs is... |
1207.1800 | Emmanuil Saridakis | Emmanuel N. Saridakis (Natl. Tech. U., Athens and Baylor U. and Paris,
Inst. Astrophys.) | Phantom crossing and quintessence limit in extended nonlinear massive
gravity | 16 pages, 2 figures, version published at Class.Quant.Grav | null | 10.1088/0264-9381/30/7/075003 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmological evolution in a universe governed by the
extended, varying-mass, nonlinear massive gravity, in which the graviton mass
is promoted to a scalar-field. We find that the dynamics, both in flat and open
universe, can lead the varying graviton mass to zero at late times, offering a
natural e... | [
{
"created": "Sat, 7 Jul 2012 14:48:10 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jul 2012 07:12:58 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jan 2013 15:18:50 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Mar 2013 13:33:49 GMT",
"version": "v4"
}
] | 2013-03-08 | [
[
"Saridakis",
"Emmanuel N.",
"",
"Natl. Tech. U., Athens and Baylor U. and Paris,\n Inst. Astrophys."
]
] | We investigate the cosmological evolution in a universe governed by the extended, varying-mass, nonlinear massive gravity, in which the graviton mass is promoted to a scalar-field. We find that the dynamics, both in flat and open universe, can lead the varying graviton mass to zero at late times, offering a natural exp... |
0811.4495 | Iain Brown | Iain A. Brown, Georg Robbers and Juliane Behrend | Averaging Robertson-Walker Cosmologies | 18 pages, 11 figures, ReVTeX. Updated to version accepted by JCAP | JCAP 0904:016,2009 | 10.1088/1475-7516/2009/04/016 | HD-THEP-08-30 | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological backreaction arises when one directly averages the Einstein
equations to recover an effective Robertson-Walker cosmology, rather than
assuming a background a priori. While usually discussed in the context of dark
energy, strictly speaking any cosmological model should be recovered from such
a procedu... | [
{
"created": "Thu, 27 Nov 2008 20:54:28 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2009 11:05:10 GMT",
"version": "v2"
}
] | 2009-09-10 | [
[
"Brown",
"Iain A.",
""
],
[
"Robbers",
"Georg",
""
],
[
"Behrend",
"Juliane",
""
]
] | The cosmological backreaction arises when one directly averages the Einstein equations to recover an effective Robertson-Walker cosmology, rather than assuming a background a priori. While usually discussed in the context of dark energy, strictly speaking any cosmological model should be recovered from such a procedure... |
1604.03873 | Luca Visinelli | Luca Visinelli | Inflating without a flat potential: Viscous inflation | 4 pages, references added, results unchanged with respect to version
1 | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bulk viscosity leads to negative pressure, which is a key ingredient for
successful inflation. We build an inflationary model where the slow-roll of the
inflaton field is driven by a viscous component instead of the flat potential
commonly used. Since viscosity does not contribute to the energy density of the
Univers... | [
{
"created": "Tue, 12 Apr 2016 18:08:38 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Apr 2017 12:03:17 GMT",
"version": "v2"
}
] | 2017-04-10 | [
[
"Visinelli",
"Luca",
""
]
] | Bulk viscosity leads to negative pressure, which is a key ingredient for successful inflation. We build an inflationary model where the slow-roll of the inflaton field is driven by a viscous component instead of the flat potential commonly used. Since viscosity does not contribute to the energy density of the Universe,... |
1508.04760 | Kazem Rezazadeh | K. Rezazadeh, K. Karami, S. Hashemi | Tachyon inflation with steep potentials | 13 pages, 1 figure | Phys. Rev. D 95, 103506 (2017) | 10.1103/PhysRevD.95.103506 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of tachyon inflation, we consider different steep
potentials and check their viability in light of the Planck 2015 data. We see
that in this scenario, the inverse power-law potential
$V(\phi)=V_{0}(\phi/\phi_{0})^{-n}$ with $n=2$ leads to the power-law inflation
with the scale factor $a(t)\propto... | [
{
"created": "Wed, 19 Aug 2015 14:31:27 GMT",
"version": "v1"
},
{
"created": "Sat, 13 May 2017 15:58:30 GMT",
"version": "v2"
}
] | 2017-05-16 | [
[
"Rezazadeh",
"K.",
""
],
[
"Karami",
"K.",
""
],
[
"Hashemi",
"S.",
""
]
] | Within the framework of tachyon inflation, we consider different steep potentials and check their viability in light of the Planck 2015 data. We see that in this scenario, the inverse power-law potential $V(\phi)=V_{0}(\phi/\phi_{0})^{-n}$ with $n=2$ leads to the power-law inflation with the scale factor $a(t)\propto t... |
1004.4970 | Hirotaka Yoshino | Masaru Shibata and Hirotaka Yoshino | Bar-mode instability of rapidly spinning black hole in higher
dimensions: Numerical simulation in general relativity | 21 pages, 9 figures, accepted for publication in PRD | Phys.Rev.D81:104035,2010 | 10.1103/PhysRevD.81.104035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical-relativity simulation is performed for rapidly spinning black holes
(BHs) in a higher-dimensional spacetime of special symmetries for the
dimensionality $6 \leq d \leq 8$. We find that higher-dimensional BHs, spinning
rapidly enough, are dynamically unstable against nonaxisymmetric bar-mode
deformation and ... | [
{
"created": "Wed, 28 Apr 2010 07:56:39 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Shibata",
"Masaru",
""
],
[
"Yoshino",
"Hirotaka",
""
]
] | Numerical-relativity simulation is performed for rapidly spinning black holes (BHs) in a higher-dimensional spacetime of special symmetries for the dimensionality $6 \leq d \leq 8$. We find that higher-dimensional BHs, spinning rapidly enough, are dynamically unstable against nonaxisymmetric bar-mode deformation and sp... |
gr-qc/9707025 | Luis Anchordoqui | Luis A. Anchordoqui, A. G. Grunfeld and Diego F. Torres | Vacuum static Brans-Dicke wormhole | 4 pages in revtex | Grav.Cosmol. 4 (1998) 287-290 | null | null | gr-qc | null | A simple Lorentzian vacuum wormhole solution of Brans-Dicke gravitation is
presented and analysed. It is shown that such solution holds for both, the
Brans-Dicke theory endowed with torsion (for a value of the coupling parameter
$\omega > 1/2$) and for the vacuum -no torsion- case (for $\omega < -2$).
| [
{
"created": "Thu, 10 Jul 1997 21:16:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Grunfeld",
"A. G.",
""
],
[
"Torres",
"Diego F.",
""
]
] | A simple Lorentzian vacuum wormhole solution of Brans-Dicke gravitation is presented and analysed. It is shown that such solution holds for both, the Brans-Dicke theory endowed with torsion (for a value of the coupling parameter $\omega > 1/2$) and for the vacuum -no torsion- case (for $\omega < -2$). |
1602.04849 | Satoshi Nakajima | Satoshi Nakajima | Reconsideration of De Donder-Weyl theory by covariant analytic mechanics | 9 pages, no figure | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the covariant analytic mechanics (CAM) is closely related to the
De Donder-Weyl (DW) theory. To treat space and time on an equal footing, the DW
theory introduces $D$ conjugate fields ($D$ is the dimension of space-time) for
each field and the CAM regards the differential forms as the basic variables.
Th... | [
{
"created": "Mon, 15 Feb 2016 21:48:04 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2016 05:51:15 GMT",
"version": "v2"
}
] | 2016-06-02 | [
[
"Nakajima",
"Satoshi",
""
]
] | We show that the covariant analytic mechanics (CAM) is closely related to the De Donder-Weyl (DW) theory. To treat space and time on an equal footing, the DW theory introduces $D$ conjugate fields ($D$ is the dimension of space-time) for each field and the CAM regards the differential forms as the basic variables. The ... |
gr-qc/9801058 | Madhavan Varadarajan | Madhavan Varadarajan(Raman Research Institute, India) | Quantum gravity effects in the CGHS model of collapse to a black hole | Latex, 26 pages, 1 figure, to appear in Phy. Rev. D (15) | Phys.Rev. D57 (1998) 3463-3473 | 10.1103/PhysRevD.57.3463 | null | gr-qc | null | We show that only a sector of the classical solution space of the CGHS model
describes formation of black holes through collapse of matter. This sector has
either right or left moving matter. We describe the sector which has left
moving matter in canonical language. In the nonperturbative quantum theory all
operators... | [
{
"created": "Sat, 17 Jan 1998 06:56:47 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Varadarajan",
"Madhavan",
"",
"Raman Research Institute, India"
]
] | We show that only a sector of the classical solution space of the CGHS model describes formation of black holes through collapse of matter. This sector has either right or left moving matter. We describe the sector which has left moving matter in canonical language. In the nonperturbative quantum theory all operators a... |
2104.07471 | Raviteja Konka | Konka Raviteja, Asrarul Haque, and Sashideep Gutti | Causal description of marginally trapped surfaces in D-dimensions | 11 pages, 5 figures | Phys. Rev. D 103, 124005 (2021) | 10.1103/PhysRevD.103.124005 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we analyse the causal aspects of evolving marginally trapped
surfaces in a D-dimensional spherically symmetric spacetime, sourced by perfect
fluid with a cosmological constant. The norm of the normal to the marginally
trapped tube is shown to be the product of lie derivatives of the expansion
parameter... | [
{
"created": "Wed, 14 Apr 2021 08:07:35 GMT",
"version": "v1"
}
] | 2021-06-08 | [
[
"Raviteja",
"Konka",
""
],
[
"Haque",
"Asrarul",
""
],
[
"Gutti",
"Sashideep",
""
]
] | In this paper, we analyse the causal aspects of evolving marginally trapped surfaces in a D-dimensional spherically symmetric spacetime, sourced by perfect fluid with a cosmological constant. The norm of the normal to the marginally trapped tube is shown to be the product of lie derivatives of the expansion parameter o... |
gr-qc/0212042 | Jong Hyuk Yoon | Jong Hyuk Yoon | (1+1)-dimensional formalism and quasi-local conservation equations | 19 pages, no figures, to appear in the Proceedings of "Advances in
General Relativity and Cosmology", the International Conference in memory of
Andre Lichnerowicz (Isola d'Elba, Italy, June 12-15, 2002) | null | null | null | gr-qc | null | A set of exact quasi-local conservation equations is obtained in the
(1+1)-dimensional description of the Einstein's equations of (3+1)-dimensional
spacetimes. These equations are interpreted as quasi-local energy, linear
momentum, and angular momentum conservation equations. In the asymptotic region
of asymptoticall... | [
{
"created": "Mon, 9 Dec 2002 20:27:02 GMT",
"version": "v1"
}
] | 2024-06-03 | [
[
"Yoon",
"Jong Hyuk",
""
]
] | A set of exact quasi-local conservation equations is obtained in the (1+1)-dimensional description of the Einstein's equations of (3+1)-dimensional spacetimes. These equations are interpreted as quasi-local energy, linear momentum, and angular momentum conservation equations. In the asymptotic region of asymptotically ... |
1304.0644 | Alexander Shatskiy Doctor | Alexander Shatskiy, Igor Novikov, Liliya Lipatova | Special features in the asymptotic expression of the electromagnetic
spectrum from dipole which free fall into a Schwarzschild black hole | 13 pages, 5 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The characteristic features were found in the electromagnetic spectrum of
radiation from free falling dipole, when it is fall radially into a
Schwarzschild black hole. These features can be used as another method for the
black hole mass determinating. Also, these features can be used for the
determination some charac... | [
{
"created": "Tue, 2 Apr 2013 14:27:05 GMT",
"version": "v1"
}
] | 2013-04-03 | [
[
"Shatskiy",
"Alexander",
""
],
[
"Novikov",
"Igor",
""
],
[
"Lipatova",
"Liliya",
""
]
] | The characteristic features were found in the electromagnetic spectrum of radiation from free falling dipole, when it is fall radially into a Schwarzschild black hole. These features can be used as another method for the black hole mass determinating. Also, these features can be used for the determination some characte... |
2006.10880 | Alvaro Bordo | Alvaro Ballon Bordo | Geometric and Thermodynamic Volume of Hairy Black Branes | 22 pages, 0 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the objective to generalize previous results found for a handful of
explicit solutions, we study the extended thermodynamics of a black brane with
minimally coupled scalar hair in D-dimensional asymptotically anti-de Sitter
spacetimes. Using Komar integration and the Hamiltonian formalism to calculate
the conser... | [
{
"created": "Thu, 18 Jun 2020 22:36:07 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2020 23:18:11 GMT",
"version": "v2"
}
] | 2020-09-10 | [
[
"Bordo",
"Alvaro Ballon",
""
]
] | With the objective to generalize previous results found for a handful of explicit solutions, we study the extended thermodynamics of a black brane with minimally coupled scalar hair in D-dimensional asymptotically anti-de Sitter spacetimes. Using Komar integration and the Hamiltonian formalism to calculate the conserve... |
1905.09464 | Hristu Culetu | Hristu Culetu | Hyperbolic vacuum decay | 8 pages, no figures, ref added, minor changes. arXiv admin note:
substantial text overlap with arXiv:1407.3588 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of an hyperbolically-expanding wormhole are studied. Using a
particular equation of state for the fluid on the wormhole throat, we reached
an equation of motion for the throat that leads to a constant surface energy
density $\sigma$. The Lagrangean leading to the above equation of motion
contains the "... | [
{
"created": "Mon, 20 May 2019 20:21:16 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2019 22:06:16 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Jun 2019 21:07:19 GMT",
"version": "v3"
}
] | 2019-06-21 | [
[
"Culetu",
"Hristu",
""
]
] | The properties of an hyperbolically-expanding wormhole are studied. Using a particular equation of state for the fluid on the wormhole throat, we reached an equation of motion for the throat that leads to a constant surface energy density $\sigma$. The Lagrangean leading to the above equation of motion contains the "re... |
1101.1761 | Luca Fabbri | Luca Fabbri | Metric-Torsional Conformal Gravity | 6 pages | Phys.Lett.B707:415-417,2012 | 10.1016/j.physletb.2012.01.008 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When in general geometric backgrounds the metric is accompanied by torsion,
the metric conformal properties should correspondingly be followed by analogous
torsional conformal properties; however a combined metric torsional conformal
structure has never been found which provides a curvature that is both
containing me... | [
{
"created": "Mon, 10 Jan 2011 10:37:27 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jan 2011 14:14:49 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jan 2012 03:27:14 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Apr 2014 12:32:55 GMT",
"version": "v4"
}
] | 2014-04-11 | [
[
"Fabbri",
"Luca",
""
]
] | When in general geometric backgrounds the metric is accompanied by torsion, the metric conformal properties should correspondingly be followed by analogous torsional conformal properties; however a combined metric torsional conformal structure has never been found which provides a curvature that is both containing metr... |
gr-qc/9911002 | Luis J. Garay | Luis J. Garay | Quantum evolution in spacetime foam | LaTeX2e, 42 pages | Int.J.Mod.Phys.A14:4079-4120,1999 | 10.1142/S0217751X99001913 | null | gr-qc | null | In this work, I review some aspects concerning the evolution of quantum
low-energy fields in a foamlike spacetime, with involved topology at the Planck
scale but with a smooth metric structure at large length scales, as follows.
Quantum gravitational fluctuations may induce a minimum length thus introducing
an additi... | [
{
"created": "Tue, 2 Nov 1999 10:55:07 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Garay",
"Luis J.",
""
]
] | In this work, I review some aspects concerning the evolution of quantum low-energy fields in a foamlike spacetime, with involved topology at the Planck scale but with a smooth metric structure at large length scales, as follows. Quantum gravitational fluctuations may induce a minimum length thus introducing an addition... |
1907.02600 | Vasilis Oikonomou | V.K. Oikonomou | Generalized Logarithmic Equation of State in Classical and Loop Quantum
Cosmology Dark Energy-Dark Matter Coupled Systems | AoP Accepted | null | 10.1016/j.aop.2019.167934 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we shall study the phase space of a coupled dark energy-dark
matter fluids system, in which the dark energy has a generalized logarithmic
corrected equation of state. Particularly, the equation of state for the dark
energy will contain a logarithmic function of the dark energy density $\rho_d$
and will ... | [
{
"created": "Thu, 4 Jul 2019 21:25:06 GMT",
"version": "v1"
}
] | 2019-10-02 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this paper we shall study the phase space of a coupled dark energy-dark matter fluids system, in which the dark energy has a generalized logarithmic corrected equation of state. Particularly, the equation of state for the dark energy will contain a logarithmic function of the dark energy density $\rho_d$ and will al... |
2104.06577 | C. Q. Geng | Chao-Qiang Geng, Yan-Ting Hsu, Jhih-Rong Lu and Lu Yin | A Dark Energy model from Generalized Proca Theory | 18 pages, 5 figures, accepted by Physics of the Dark Universe | Physics of the Dark Universe 32 (2019) 100819 | 10.1016/j.dark.2021.100819 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We consider a specific dark energy model, which only includes the Lagrangian
up to the cubic order in terms of the vector field self-interactions in the
generalized Proca theory. We examine the cosmological parameters in the model
by using the data sets of CMB and CMB+HST, respectively. In particular, the
Hubble cons... | [
{
"created": "Wed, 14 Apr 2021 01:44:25 GMT",
"version": "v1"
}
] | 2021-04-22 | [
[
"Geng",
"Chao-Qiang",
""
],
[
"Hsu",
"Yan-Ting",
""
],
[
"Lu",
"Jhih-Rong",
""
],
[
"Yin",
"Lu",
""
]
] | We consider a specific dark energy model, which only includes the Lagrangian up to the cubic order in terms of the vector field self-interactions in the generalized Proca theory. We examine the cosmological parameters in the model by using the data sets of CMB and CMB+HST, respectively. In particular, the Hubble consta... |
gr-qc/9403056 | null | A. D. Dolgov, M. B. Einhorn, and V. I. Zakharov | On Infrared Effects in de~Sitter Background | 17, UM-TH-94-11, (1 postscript fig. at end) | Phys.Rev. D52 (1995) 717-722 | 10.1103/PhysRevD.52.717 | null | gr-qc hep-ph | null | We have estimated higher order quantum gravity corrections to de~Sitter
spacetime. Our results suggest that, while the classical spacetime metric may
be distorted by the graviton self-interactions, the corrections are relatively
weaker than previously thought, possibly growing like a power rather than
exponentially i... | [
{
"created": "Tue, 29 Mar 1994 18:31:02 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Dolgov",
"A. D.",
""
],
[
"Einhorn",
"M. B.",
""
],
[
"Zakharov",
"V. I.",
""
]
] | We have estimated higher order quantum gravity corrections to de~Sitter spacetime. Our results suggest that, while the classical spacetime metric may be distorted by the graviton self-interactions, the corrections are relatively weaker than previously thought, possibly growing like a power rather than exponentially in ... |
gr-qc/0505088 | Comelli Denis | D. Comelli | Born-Infeld type Gravity | 7 pages, 3 figures, revtex | Phys.Rev. D72 (2005) 064018 | 10.1103/PhysRevD.72.064018 | null | gr-qc | null | Generalizations of gravitational Born-Infeld type lagrangians are
investigated. Phenomenological constraints (reduction to Einstein-Hilbert
action for small curvature, spin two ghost freedom and absence of Coulomb like
Schwarschild singularity) select one effective lagrangian whose dynamics is
dictated by the tensors... | [
{
"created": "Wed, 18 May 2005 17:23:08 GMT",
"version": "v1"
}
] | 2016-04-26 | [
[
"Comelli",
"D.",
""
]
] | Generalizations of gravitational Born-Infeld type lagrangians are investigated. Phenomenological constraints (reduction to Einstein-Hilbert action for small curvature, spin two ghost freedom and absence of Coulomb like Schwarschild singularity) select one effective lagrangian whose dynamics is dictated by the tensors g... |
1110.6706 | Piotr T. Chru\'sciel | Piotr T. Chru\'sciel | Elements of causality theory | null | null | null | Preprint UWThPh-2011-32 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These notes present some elements of causality theory. While they are not as
complete as other treatments of the topic, there is some originality in that
the whole approach is based on a definition of causal curves which allows to
simplify many arguments. We keep track of the differentiability needed for
various stat... | [
{
"created": "Mon, 31 Oct 2011 07:02:58 GMT",
"version": "v1"
}
] | 2011-11-01 | [
[
"Chruściel",
"Piotr T.",
""
]
] | These notes present some elements of causality theory. While they are not as complete as other treatments of the topic, there is some originality in that the whole approach is based on a definition of causal curves which allows to simplify many arguments. We keep track of the differentiability needed for various statem... |
2309.02472 | Behzad Eslam Panah | B. Eslam Panah, M. Khorasani, and J. Sedaghat | Three-dimensional accelerating AdS black holes in $F(R)$ gravity | 11 pages, 3 figures | Eur. Phys. J. Plus 138 (2023) 728 | 10.1140/epjp/s13360-023-04339-w | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering a three-dimensional $C-$metric, we obtain the exact accelerating
black holes in the $F(R)$ theory of gravity coupled with and without a matter
field. First, we extract uncharged accelerating AdS black hole solutions in
$F(R)$ gravity. Then, we study the effects of various parameters on metric
function, ro... | [
{
"created": "Tue, 5 Sep 2023 11:11:23 GMT",
"version": "v1"
}
] | 2023-09-07 | [
[
"Panah",
"B. Eslam",
""
],
[
"Khorasani",
"M.",
""
],
[
"Sedaghat",
"J.",
""
]
] | Considering a three-dimensional $C-$metric, we obtain the exact accelerating black holes in the $F(R)$ theory of gravity coupled with and without a matter field. First, we extract uncharged accelerating AdS black hole solutions in $F(R)$ gravity. Then, we study the effects of various parameters on metric function, root... |
1501.05358 | Philipp M\"osta | P. M\"osta, L. Andersson, J. Metzger, B. Szil\'agyi, and J. Winicour | The Merger of Small and Large Black Holes | 17 pages, 11 figures | null | 10.1088/0264-9381/32/23/235003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present simulations of binary black holes mergers in which, after the
common outer horizon has formed, the marginally outer trapped surfaces (MOTSs)
corresponding to the individual black holes continue to approach and eventually
penetrate each other. This has very interesting consequences according to
recent resul... | [
{
"created": "Thu, 22 Jan 2015 00:27:44 GMT",
"version": "v1"
}
] | 2015-11-18 | [
[
"Mösta",
"P.",
""
],
[
"Andersson",
"L.",
""
],
[
"Metzger",
"J.",
""
],
[
"Szilágyi",
"B.",
""
],
[
"Winicour",
"J.",
""
]
] | We present simulations of binary black holes mergers in which, after the common outer horizon has formed, the marginally outer trapped surfaces (MOTSs) corresponding to the individual black holes continue to approach and eventually penetrate each other. This has very interesting consequences according to recent results... |
1507.03205 | Marco Letizia | Ricardo Gallego Torrom\'e, Marco Letizia, Stefano Liberati | Phenomenology of effective geometries from quantum gravity | 8 pages | Phys. Rev. D 92, 124021 (2015) | 10.1103/PhysRevD.92.124021 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper (arXiv:1412.6000) a general mechanism for emergence of
cosmological space-time geometry from a quantum gravity setting was devised and
departure from standard dispersion relations for elementary particle were
predicted. We elaborate here on this approach extending the results obtained in
that paper ... | [
{
"created": "Sun, 12 Jul 2015 08:29:00 GMT",
"version": "v1"
}
] | 2015-12-16 | [
[
"Torromé",
"Ricardo Gallego",
""
],
[
"Letizia",
"Marco",
""
],
[
"Liberati",
"Stefano",
""
]
] | In a recent paper (arXiv:1412.6000) a general mechanism for emergence of cosmological space-time geometry from a quantum gravity setting was devised and departure from standard dispersion relations for elementary particle were predicted. We elaborate here on this approach extending the results obtained in that paper an... |
2110.14973 | Sebastian Murk | Sebastian Murk | Physical black holes in fourth-order gravity | 10 pages, 2 tables. Published version. Comments welcome! | Phys. Rev. D 105, 044051 (2022) | 10.1103/PhysRevD.105.044051 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of black holes is a central prediction of general relativity
and thus serves as a basic consistency test for modified theories of gravity.
In spherical symmetry, only two classes of dynamic solutions are compatible
with the formation of an apparent horizon in finite time of a distant observer.
Moreover,... | [
{
"created": "Thu, 28 Oct 2021 09:22:55 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Nov 2021 11:11:00 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Feb 2022 10:00:00 GMT",
"version": "v3"
}
] | 2022-03-01 | [
[
"Murk",
"Sebastian",
""
]
] | The existence of black holes is a central prediction of general relativity and thus serves as a basic consistency test for modified theories of gravity. In spherical symmetry, only two classes of dynamic solutions are compatible with the formation of an apparent horizon in finite time of a distant observer. Moreover, t... |
1405.5224 | Benjam\'in Calvo-Mozo | Benjam\'in Calvo-Mozo | Space-time measures for subluminal and superluminal motions | 10 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1308.4575 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In present work we examine the implications on both, space-time measures and
causal structure, of a generalization of the local causality postulate by
asserting its validity to all motion regimes, the subluminal and superluminal
ones. The new principle implies the existence of a denumerable set of metrical
null cone ... | [
{
"created": "Tue, 20 May 2014 20:01:20 GMT",
"version": "v1"
}
] | 2016-08-11 | [
[
"Calvo-Mozo",
"Benjamín",
""
]
] | In present work we examine the implications on both, space-time measures and causal structure, of a generalization of the local causality postulate by asserting its validity to all motion regimes, the subluminal and superluminal ones. The new principle implies the existence of a denumerable set of metrical null cone sp... |
1811.02574 | Shahar Hod | Shahar Hod | The Hawking paradox and the Bekenstein resolution in higher-dimensional
spacetimes | 6 pages | Nuclear Physics B 933, 299 (2018) | 10.1016/j.nuclphysb.2018.06.011 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The black-hole information puzzle has attracted much attention over the years
from both physicists and mathematicians. One of the most intriguing suggestions
to resolve the information paradox is due to Bekenstein, who has stressed the
fact that the low-energy part of the semi-classical black-hole emission
spectrum i... | [
{
"created": "Tue, 6 Nov 2018 19:00:03 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Hod",
"Shahar",
""
]
] | The black-hole information puzzle has attracted much attention over the years from both physicists and mathematicians. One of the most intriguing suggestions to resolve the information paradox is due to Bekenstein, who has stressed the fact that the low-energy part of the semi-classical black-hole emission spectrum is ... |
2304.06732 | Muhammad Sharif | M. Sharif and Saba Naz | Study of Decoupled Gravastars in Energy-momentum Squared Gravity | 21 pages, 6 figures | Annals Phys. 451(2023)169240 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we generate an exact anisotropic gravastar model using
gravitational decoupling technique through minimal geometric deformation in the
framework of $f(\Re, {T}^{2})$ gravity. This novel model explains an
ultra-compact stellar configuration whose internal region is smoothly matched
to the exterior regio... | [
{
"created": "Thu, 13 Apr 2023 03:20:38 GMT",
"version": "v1"
}
] | 2023-04-17 | [
[
"Sharif",
"M.",
""
],
[
"Naz",
"Saba",
""
]
] | In this paper, we generate an exact anisotropic gravastar model using gravitational decoupling technique through minimal geometric deformation in the framework of $f(\Re, {T}^{2})$ gravity. This novel model explains an ultra-compact stellar configuration whose internal region is smoothly matched to the exterior region.... |
2006.09781 | Alejandro Garc\'ia-Quismondo | Alejandro Garc\'ia-Quismondo, Guillermo A. Mena Marug\'an and Gabriel
S\'anchez P\'erez | The time-dependent mass of cosmological perturbations in loop quantum
cosmology: Dapor-Liegener regularization | 25 pages, 5 figures | Class. Quant. Grav. 37, 195003 (2020) | 10.1088/1361-6382/abac6d | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we compute the time-dependent masses that govern the dynamics
of scalar and tensor perturbations propagating on an effective flat,
homogeneous, and isotropic background within the framework of loop quantum
cosmology, regularized according to the procedure put forward by Dapor and
Liegener. To do so, we ... | [
{
"created": "Wed, 17 Jun 2020 11:20:12 GMT",
"version": "v1"
}
] | 2020-12-10 | [
[
"García-Quismondo",
"Alejandro",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
],
[
"Pérez",
"Gabriel Sánchez",
""
]
] | In this work, we compute the time-dependent masses that govern the dynamics of scalar and tensor perturbations propagating on an effective flat, homogeneous, and isotropic background within the framework of loop quantum cosmology, regularized according to the procedure put forward by Dapor and Liegener. To do so, we fo... |
2210.08913 | Dmitri Gal'tsov | G\'erard Cl\'ement and Dmitri Gal'tsov | Rotating traversable wormholes in Einstein-Maxwell theory | 16 pages, no figures, published version | Physics Letters B 838 (2023) 137677 | 10.1016/j.physletb.2023.137677 | LAPTH-064/22 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that traversable wormhole solutions to the Einstein
equations require the existence of an exotic matter source violating the null
energy condition. An apparent exception is the overcharged Kerr-Newman-NUT
solution of the Einstein-Maxwell equations, which has all the properties of a
geodesically compl... | [
{
"created": "Mon, 17 Oct 2022 10:09:18 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Jan 2023 15:10:24 GMT",
"version": "v2"
}
] | 2023-01-24 | [
[
"Clément",
"Gérard",
""
],
[
"Gal'tsov",
"Dmitri",
""
]
] | It is well-known that traversable wormhole solutions to the Einstein equations require the existence of an exotic matter source violating the null energy condition. An apparent exception is the overcharged Kerr-Newman-NUT solution of the Einstein-Maxwell equations, which has all the properties of a geodesically complet... |
1911.03950 | Shih-Yuin Lin | Shih-Yuin Lin | Notes on observational and radar coordinates for localized observers | 17 pages, 8 figures, typos corrected, plots updated | Phys. Rev. D 101, 124001 (2020) | 10.1103/PhysRevD.101.124001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The worldline of a uniformly accelerated localized observer in Minkowski
space is restricted in the Rindler wedge, where the observer can in principle
arrange experiments repeatedly, and the Cauchy problem for quantum fields in
that Rindler wedge can be well defined. However, the observer can still receive
the signal... | [
{
"created": "Sun, 10 Nov 2019 16:01:38 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jun 2020 02:54:33 GMT",
"version": "v2"
}
] | 2020-06-08 | [
[
"Lin",
"Shih-Yuin",
""
]
] | The worldline of a uniformly accelerated localized observer in Minkowski space is restricted in the Rindler wedge, where the observer can in principle arrange experiments repeatedly, and the Cauchy problem for quantum fields in that Rindler wedge can be well defined. However, the observer can still receive the signals ... |
gr-qc/9405065 | Neil Cornish | Neil Cornish | Interior Solutions for Non-singular Gravity and the Dark Star
alternative to Black Holes | 16 pages, RevTeX, 6 figures available on request. UTPT-94-10 | null | null | null | gr-qc astro-ph | null | The general equations describing hydrostatic equilibrium are developed for
Non-singular Gravity. A new type of astrophysical structure, a Super Dense
Object (SDO) or "Dark Star", is shown to exist beyond Neutron star field
strengths. These structures are intrinsically stable against gravitational
collapse and represe... | [
{
"created": "Fri, 27 May 1994 01:17:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cornish",
"Neil",
""
]
] | The general equations describing hydrostatic equilibrium are developed for Non-singular Gravity. A new type of astrophysical structure, a Super Dense Object (SDO) or "Dark Star", is shown to exist beyond Neutron star field strengths. These structures are intrinsically stable against gravitational collapse and represent... |
0808.2977 | Elizabeth Winstanley | J. E. Baxter and Elizabeth Winstanley | On the existence of soliton and hairy black hole solutions of su(N)
Einstein-Yang-Mills theory with a negative cosmological constant | 38 pages, 8 figures, typos corrected, accepted for publication in
Classical and Quantum Gravity | Class.Quant.Grav.25:245014,2008 | 10.1088/0264-9381/25/24/245014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the existence of soliton and black hole solutions of
four-dimensional su(N) Einstein-Yang-Mills theory with a negative cosmological
constant. We prove the existence of non-trivial solutions for any integer N,
with N-1 gauge field degrees of freedom. In particular, we prove the existence
of solutions in which... | [
{
"created": "Thu, 21 Aug 2008 18:58:32 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Oct 2008 12:18:52 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Baxter",
"J. E.",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | We study the existence of soliton and black hole solutions of four-dimensional su(N) Einstein-Yang-Mills theory with a negative cosmological constant. We prove the existence of non-trivial solutions for any integer N, with N-1 gauge field degrees of freedom. In particular, we prove the existence of solutions in which a... |
2011.13787 | Reed Essick | Reed Essick, Geoffrey Mo, Erik Katsavounidis | A Coincidence Null Test for Poisson-Distributed Events | 14 pages, 7 Figures | Phys. Rev. D 103, 042003 (2021) | 10.1103/PhysRevD.103.042003 | null | gr-qc astro-ph.HE astro-ph.IM physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When transient events are observed with multiple sensors, it is often
necessary to establish the significance of coincident events. We derive a
universal null test for an arbitrary number of sensors motivated by the
archetypal detection problem for independent Poisson-distributed events in
gravitational-wave detector... | [
{
"created": "Fri, 27 Nov 2020 15:40:14 GMT",
"version": "v1"
}
] | 2021-02-10 | [
[
"Essick",
"Reed",
""
],
[
"Mo",
"Geoffrey",
""
],
[
"Katsavounidis",
"Erik",
""
]
] | When transient events are observed with multiple sensors, it is often necessary to establish the significance of coincident events. We derive a universal null test for an arbitrary number of sensors motivated by the archetypal detection problem for independent Poisson-distributed events in gravitational-wave detectors ... |
2006.00228 | Prabir Rudra | Prabir Rudra (Asutosh College) | A Time Dependent Spacetime in $f(R,T)$ Gravity: Gravitational Collapse | 27 pages, 9 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this note a time dependent spacetime is explored in the background of
$f(R,T)$ gravity via the gravitational collapse of a massive star. The star is
modelled by the Vaidya spacetime which is time dependent in nature. The
coupling of matter with curvature is the key feature of $f(R,T)$ theory and
here we have inves... | [
{
"created": "Sat, 30 May 2020 09:41:55 GMT",
"version": "v1"
}
] | 2020-06-02 | [
[
"Rudra",
"Prabir",
"",
"Asutosh College"
]
] | In this note a time dependent spacetime is explored in the background of $f(R,T)$ gravity via the gravitational collapse of a massive star. The star is modelled by the Vaidya spacetime which is time dependent in nature. The coupling of matter with curvature is the key feature of $f(R,T)$ theory and here we have investi... |
2005.05577 | Rajesh Kumar | Rajesh Kumar and Sudhir Kumar Srivastava | Dynamics of expansion free self gravitating cylindrically symmetric
radiating star | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work deals with the dynamics of radiating star which is
considered to be expansion free cylindrical symmetric dust dissipative fluids.
Several treatments are adopted for the description of geometrical and physical
features of such stars. Firstly, it is shown that, the dynamical star does not
permit the st... | [
{
"created": "Tue, 12 May 2020 07:07:33 GMT",
"version": "v1"
}
] | 2020-05-13 | [
[
"Kumar",
"Rajesh",
""
],
[
"Srivastava",
"Sudhir Kumar",
""
]
] | The present work deals with the dynamics of radiating star which is considered to be expansion free cylindrical symmetric dust dissipative fluids. Several treatments are adopted for the description of geometrical and physical features of such stars. Firstly, it is shown that, the dynamical star does not permit the stre... |
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