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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1106.5000 | Javier Olmedo | Jer\'onimo Cortez, Guillermo A. Mena Marug\'an, Javier Olmedo, Jos\'e
M. Velhinho | A uniqueness criterion for the Fock quantization of scalar fields with
time dependent mass | 11 pages, version accepted for publication in Classical and Quantum
Gravity | Class. Quantum Grav. 28 (2011) 172001 | 10.1088/0264-9381/28/17/172001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A major problem in the quantization of fields in curved spacetimes is the
ambiguity in the choice of a Fock representation for the canonical commutation
relations. There exists an infinite number of choices leading to different
physical predictions. In stationary scenarios, a common strategy is to select a
vacuum (or... | [
{
"created": "Fri, 24 Jun 2011 15:35:14 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2011 09:06:17 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Aug 2011 21:28:17 GMT",
"version": "v3"
}
] | 2011-08-24 | [
[
"Cortez",
"Jerónimo",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
],
[
"Olmedo",
"Javier",
""
],
[
"Velhinho",
"José M.",
""
]
] | A major problem in the quantization of fields in curved spacetimes is the ambiguity in the choice of a Fock representation for the canonical commutation relations. There exists an infinite number of choices leading to different physical predictions. In stationary scenarios, a common strategy is to select a vacuum (or a... |
gr-qc/0408010 | Carsten Weber | Claus Kiefer, Carsten Weber | On the interaction of mesoscopic quantum systems with gravity | 27 pages, study for ESA: typos corrected, references and
clarifications added. To appear in Annalen der Physik | Annalen Phys. 14 (2005) 253-278 | 10.1002/andp.200410119 | null | gr-qc cond-mat.mes-hall quant-ph | null | We review the different aspects of the interaction of mesoscopic quantum
systems with gravitational fields. We first discuss briefly the foundations of
general relativity and quantum mechanics. Then, we consider the
non-relativistic expansions of the Klein-Gordon and Dirac equations in the
post-Newtonian approximatio... | [
{
"created": "Tue, 3 Aug 2004 20:43:12 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2004 13:11:22 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kiefer",
"Claus",
""
],
[
"Weber",
"Carsten",
""
]
] | We review the different aspects of the interaction of mesoscopic quantum systems with gravitational fields. We first discuss briefly the foundations of general relativity and quantum mechanics. Then, we consider the non-relativistic expansions of the Klein-Gordon and Dirac equations in the post-Newtonian approximation.... |
0804.4224 | Florian Beyer | Florian Beyer | Investigations of solutions of Einstein's field equations close to
lambda-Taub-NUT | 24 pages, 12 figures, uses psfrag and hyperref; replaced with
published version, only minor corrections of typos and references | Class.Quant.Grav.25:235005,2008 | 10.1088/0264-9381/25/23/235005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present investigations of a class of solutions of Einstein's field
equations close to the family of lambda-Taub-NUT spacetimes. The studies are
done using a numerical code introduced by the author elsewhere. One of the main
technical complication is due to the S3-topology of the Cauchy surfaces.
Complementing thes... | [
{
"created": "Sat, 26 Apr 2008 16:36:25 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 2008 09:53:25 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Beyer",
"Florian",
""
]
] | We present investigations of a class of solutions of Einstein's field equations close to the family of lambda-Taub-NUT spacetimes. The studies are done using a numerical code introduced by the author elsewhere. One of the main technical complication is due to the S3-topology of the Cauchy surfaces. Complementing these ... |
gr-qc/0703074 | Chopin Soo | Chopin Soo | Three-geometry and reformulation of the Wheeler-DeWitt equation | 10 pages, LaTeX file | Class.Quant.Grav.24:1547-1555,2007 | 10.1088/0264-9381/24/6/011 | null | gr-qc | null | A reformulation of the Wheeler-DeWitt equation which highlights the role of
gauge-invariant three-geometry elements is presented. It is noted that the
classical super-Hamiltonian of four-dimensional gravity as simplified by
Ashtekar through the use of gauge potential and densitized triad variables can
furthermore be ... | [
{
"created": "Tue, 13 Mar 2007 10:51:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Soo",
"Chopin",
""
]
] | A reformulation of the Wheeler-DeWitt equation which highlights the role of gauge-invariant three-geometry elements is presented. It is noted that the classical super-Hamiltonian of four-dimensional gravity as simplified by Ashtekar through the use of gauge potential and densitized triad variables can furthermore be su... |
gr-qc/9912037 | Subodha | S. Mishra (CTS and Dept. of Physics, IIT Kharagpur, India), D. N.
Tripathy (Institute of Physics, Bhubaneswar, India) | A quantum mechanical derivation of Gamow's relation for the time and
temperature of the expanding Universe | Tex-file, 13 pages | null | null | CTS-kgp/28/Sept/99 | gr-qc | null | The quantum mechanical approach developed by us recently for the evolution of
the universe is used to derive an alternative derivation connecting the
temperature of the cosmic background radiation and the age of the universe
which is found to be similar to the one obtained by Gamow long back. By
assuming the age of t... | [
{
"created": "Fri, 10 Dec 1999 08:15:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mishra",
"S.",
"",
"CTS and Dept. of Physics, IIT Kharagpur, India"
],
[
"Tripathy",
"D. N.",
"",
"Institute of Physics, Bhubaneswar, India"
]
] | The quantum mechanical approach developed by us recently for the evolution of the universe is used to derive an alternative derivation connecting the temperature of the cosmic background radiation and the age of the universe which is found to be similar to the one obtained by Gamow long back. By assuming the age of the... |
2001.00615 | Canisius Bernard | Canisius Bernard, Masoud Ghezelbash | Hidden conformal symmetry of the rotating charged AdS black holes in
quadratic $f$($T$) gravity | 21 pages, 8 figures; v2: references added | Phys. Rev. D 101, 024020 (2020) | 10.1103/PhysRevD.101.024020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nonextremal Kerr black holes have been considered to be holographically
dual to two-dimensional (2D) conformal field theories (CFTs). In this paper, we
extend the holography to the case of an asymptotically anti--de Sitter (AdS)
rotating charged black holes in $f$($T$) gravity, where $f(T) = T + \alpha
T^2$, wher... | [
{
"created": "Thu, 2 Jan 2020 20:24:23 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jan 2020 22:36:53 GMT",
"version": "v2"
}
] | 2020-01-17 | [
[
"Bernard",
"Canisius",
""
],
[
"Ghezelbash",
"Masoud",
""
]
] | The nonextremal Kerr black holes have been considered to be holographically dual to two-dimensional (2D) conformal field theories (CFTs). In this paper, we extend the holography to the case of an asymptotically anti--de Sitter (AdS) rotating charged black holes in $f$($T$) gravity, where $f(T) = T + \alpha T^2$, where ... |
1206.0540 | Lau Loi So | Lau Loi So | Quasilocal energy-momentum for tensors B and V in small regions | 11 pages, a major revision of arXiv:1006.5272 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Bel-Robinson tensor $B$ and the tensor $V$ have the same quasilocal
energy-momentum in a small sphere. Using a pseudotensor approach to evaluate
the energy-momentum in a half-cylinder, we find that $B$ and $V$ have different
values, not proportional to the "Bel-Robinson energy-momentum". Furthermore,
even if we a... | [
{
"created": "Mon, 4 Jun 2012 08:11:53 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Sep 2013 14:09:56 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jan 2022 14:42:48 GMT",
"version": "v3"
}
] | 2022-01-06 | [
[
"So",
"Lau Loi",
""
]
] | The Bel-Robinson tensor $B$ and the tensor $V$ have the same quasilocal energy-momentum in a small sphere. Using a pseudotensor approach to evaluate the energy-momentum in a half-cylinder, we find that $B$ and $V$ have different values, not proportional to the "Bel-Robinson energy-momentum". Furthermore, even if we arr... |
1803.02620 | Sunny Vagnozzi | Alessandro Casalino, Massimiliano Rinaldi, Lorenzo Sebastiani, Sunny
Vagnozzi | Mimicking dark matter and dark energy in a mimetic model compatible with
GW170817 | 29 pages, 2 figures. Version accepted for publication in Phys. Dark
Univ | Phys. Dark Univ. 22 (2018) 108 | 10.1016/j.dark.2018.10.001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent observation of the the gravitational wave event GW170817 and of
its electromagnetic counterpart GRB170817A, from a binary neutron star merger,
has established that the speed of gravitational waves deviates from the speed
of light by less than one part in $10^{15}$. As a consequence, many extensions
of Gene... | [
{
"created": "Wed, 7 Mar 2018 12:43:23 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2018 15:38:47 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Oct 2018 11:59:40 GMT",
"version": "v3"
}
] | 2018-12-13 | [
[
"Casalino",
"Alessandro",
""
],
[
"Rinaldi",
"Massimiliano",
""
],
[
"Sebastiani",
"Lorenzo",
""
],
[
"Vagnozzi",
"Sunny",
""
]
] | The recent observation of the the gravitational wave event GW170817 and of its electromagnetic counterpart GRB170817A, from a binary neutron star merger, has established that the speed of gravitational waves deviates from the speed of light by less than one part in $10^{15}$. As a consequence, many extensions of Genera... |
2301.11665 | Vahideh Memari Rishakani | Vahideh Memari and S. Habib Mazharimousavi | Causal structure and the geodesics in the hairy extension of the
Bertotti-Robinson spacetime | 19 pages and 12 figures | Phys. Scr. 98, 075303 (2023) | 10.1088/1402-4896/acdeb6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A hairy extension of the Bertotti-Robinson regular spacetime has been
recently introduced in the context of the Einstein-Maxwell-Scaler theory that
surprisingly is a singular black hole formed in the $S_{3}$ background spatial
topology [CQG39(2022)167001]. In this research, we first clarify the topology
of the spacet... | [
{
"created": "Fri, 27 Jan 2023 11:49:37 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Jul 2023 16:11:04 GMT",
"version": "v2"
}
] | 2023-07-06 | [
[
"Memari",
"Vahideh",
""
],
[
"Mazharimousavi",
"S. Habib",
""
]
] | A hairy extension of the Bertotti-Robinson regular spacetime has been recently introduced in the context of the Einstein-Maxwell-Scaler theory that surprisingly is a singular black hole formed in the $S_{3}$ background spatial topology [CQG39(2022)167001]. In this research, we first clarify the topology of the spacetim... |
gr-qc/9311029 | null | J.E.Nelson and T.Regge | Quantisation of 2+1 gravity for genus 2 | 11 pages, 2 figures available from authors, DFTT 54/93 | Phys. Rev. D 50, 5125 (1994) | 10.1103/PhysRevD.50.5125 | null | gr-qc hep-th | null | In [1,2] we established and discussed the algebra of observables for $2+1$
gravity at both the classical and quantum level, and gave a systematic
discussion of the reduction of the expected number of independent observables
to $6g - 6 (g > 1)$. In this paper the algebra of observables for the case
$g=2$ is reduced to... | [
{
"created": "Wed, 17 Nov 1993 16:45:32 GMT",
"version": "v1"
}
] | 2013-11-13 | [
[
"Nelson",
"J. E.",
""
],
[
"Regge",
"T.",
""
]
] | In [1,2] we established and discussed the algebra of observables for $2+1$ gravity at both the classical and quantum level, and gave a systematic discussion of the reduction of the expected number of independent observables to $6g - 6 (g > 1)$. In this paper the algebra of observables for the case $g=2$ is reduced to a... |
0708.2356 | Elizabeth Winstanley | J. E. Baxter, Marc Helbling and Elizabeth Winstanley | Abundant stable gauge field hair for black holes in anti-de Sitter space | 4 pages, 3 figures, new introduction, additional minor changes,
published in Physical Review Letters | Phys.Rev.Lett.100:011301,2008 | 10.1103/PhysRevLett.100.011301 | null | gr-qc hep-th | null | We present new hairy black hole solutions of su(N) Einstein-Yang-Mills theory
(EYM) in asymptotically anti-de Sitter (adS) space. These black holes are
described by N+1 independent parameters, and have N-1 independent gauge field
degrees of freedom. Solutions in which all gauge field functions have no zeros
exist for... | [
{
"created": "Fri, 17 Aug 2007 12:40:08 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2008 16:51:57 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Baxter",
"J. E.",
""
],
[
"Helbling",
"Marc",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | We present new hairy black hole solutions of su(N) Einstein-Yang-Mills theory (EYM) in asymptotically anti-de Sitter (adS) space. These black holes are described by N+1 independent parameters, and have N-1 independent gauge field degrees of freedom. Solutions in which all gauge field functions have no zeros exist for a... |
gr-qc/9912048 | Jose Socorro Garcia Diaz | J. Socorro and E. R. Medina | Supersymmetric Quantum Mechanics for Bianchi Class A models | 9 pages, two figures, Revtex, to appear in Phys. Rev. D | Phys.Rev. D61 (2000) 087702 | 10.1103/PhysRevD.61.087702 | IFUG-99-15 | gr-qc | null | In this work we present cosmological quantum solutions for all Bianchi Class
A cosmological models obtained by means of supersymmetric quantum mechanics .
We are able to write one general expression for all bosonic components occuring
in the Grassmann expansion of the wave function of the Universe for this class
of m... | [
{
"created": "Mon, 13 Dec 1999 16:53:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Socorro",
"J.",
""
],
[
"Medina",
"E. R.",
""
]
] | In this work we present cosmological quantum solutions for all Bianchi Class A cosmological models obtained by means of supersymmetric quantum mechanics . We are able to write one general expression for all bosonic components occuring in the Grassmann expansion of the wave function of the Universe for this class of mod... |
2207.05690 | Thomas Helfer | Robin Croft, Thomas Helfer, Bo-Xuan Ge, Miren Radia, Tamara
Evstafyeva, Eugene A. Lim, Ulrich Sperhake, Katy Clough | The Gravitational Afterglow of Boson Stars | Movie: https://youtu.be/JE5FRG7kgvU Data:
https://github.com/ThomasHelfer/BosonStarAfterglow | null | 10.1088/1361-6382/acace4 | KCL-TH-2021-82 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the long-lived post-merger gravitational wave signature
of a boson-star binary coalescence. We use full numerical relativity to
simulate the post-merger and track the gravitational afterglow over an extended
period of time. We implement recent innovations for the binary initial data,
which signi... | [
{
"created": "Tue, 12 Jul 2022 17:10:24 GMT",
"version": "v1"
}
] | 2023-03-01 | [
[
"Croft",
"Robin",
""
],
[
"Helfer",
"Thomas",
""
],
[
"Ge",
"Bo-Xuan",
""
],
[
"Radia",
"Miren",
""
],
[
"Evstafyeva",
"Tamara",
""
],
[
"Lim",
"Eugene A.",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Cl... | In this work we study the long-lived post-merger gravitational wave signature of a boson-star binary coalescence. We use full numerical relativity to simulate the post-merger and track the gravitational afterglow over an extended period of time. We implement recent innovations for the binary initial data, which signifi... |
1909.10295 | Pawan Joshi | Pawan Joshi, Utkarsh Kumar, Sukanta Panda | Hamiltonian Formalism for Nonlocal Gravity Models | 19 pages | International Journal of Geometric Methods in Modern Physics 2
(2022) | 10.1142/S0219887822500360 | 2250036 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonlocal gravity models are constructed to explain the current acceleration
of the universe. These models are inspired by the infrared correction appearing
in Einstein Hilbert action. Here we develop the Hamiltonian formalism of a
nonlocal model by considering only terms to quadratic order in Ricci tensor and
Ricci s... | [
{
"created": "Mon, 23 Sep 2019 11:23:53 GMT",
"version": "v1"
}
] | 2021-12-28 | [
[
"Joshi",
"Pawan",
""
],
[
"Kumar",
"Utkarsh",
""
],
[
"Panda",
"Sukanta",
""
]
] | Nonlocal gravity models are constructed to explain the current acceleration of the universe. These models are inspired by the infrared correction appearing in Einstein Hilbert action. Here we develop the Hamiltonian formalism of a nonlocal model by considering only terms to quadratic order in Ricci tensor and Ricci sca... |
1005.0627 | Michael Kesden | Michael Kesden, Guglielmo Lockhart, and E. Sterl Phinney | Maximum black-hole spin from quasi-circular binary mergers | final version accepted in PRD, new Fig.4 and discussion | Phys.Rev.D82:124045,2010 | 10.1103/PhysRevD.82.124045 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes of mass M must have a spin angular momentum S below the Kerr
limit chi = S/M^2 < 1, but whether astrophysical black holes can attain this
limiting spin depends on their accretion history. Gas accretion from a thin
disk limits the black-hole spin to chi_gas < 0.9980 +- 0.0002, as
electromagnetic radiation ... | [
{
"created": "Tue, 4 May 2010 20:07:43 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 2010 16:11:09 GMT",
"version": "v2"
}
] | 2010-12-21 | [
[
"Kesden",
"Michael",
""
],
[
"Lockhart",
"Guglielmo",
""
],
[
"Phinney",
"E. Sterl",
""
]
] | Black holes of mass M must have a spin angular momentum S below the Kerr limit chi = S/M^2 < 1, but whether astrophysical black holes can attain this limiting spin depends on their accretion history. Gas accretion from a thin disk limits the black-hole spin to chi_gas < 0.9980 +- 0.0002, as electromagnetic radiation fr... |
gr-qc/0703148 | Patricio S. Letelier | V. M. Rosa and P. S. Letelier | Stability of Closed Timelike Geodesics | 5 pages, REvTex, discussion added. PLA, in press | Phys.Lett.A370:99-103,2007 | 10.1016/j.physleta.2007.05.041 | null | gr-qc | null | The existence and stability under linear perturbations of closed timelike
geodesics (CTGs) in Bonnor-Ward spacetime is studied in some detail. Regions
where the CTG exist and are linearly stable are exhibited.
| [
{
"created": "Thu, 29 Mar 2007 15:37:32 GMT",
"version": "v1"
},
{
"created": "Mon, 28 May 2007 18:07:02 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Rosa",
"V. M.",
""
],
[
"Letelier",
"P. S.",
""
]
] | The existence and stability under linear perturbations of closed timelike geodesics (CTGs) in Bonnor-Ward spacetime is studied in some detail. Regions where the CTG exist and are linearly stable are exhibited. |
1902.09170 | Gary Gibbons | G. W. Gibbons | The Ashtekar-Hansen universal structure at spatial infinity is weakly
pseudo-Carrollian | Appendix deleted and typos corrected | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that Ashtekar and Hansens's Universal Structure at Spatial
Infinity (SPI), which has recently be used to establish the conservation of
supercharges from past null infity to future null infinity, is an example of a
(pseudo-) Carollian structure. The relation to Kinematic Algebras is clarified.
| [
{
"created": "Mon, 25 Feb 2019 09:57:44 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jun 2019 11:11:45 GMT",
"version": "v2"
}
] | 2019-06-14 | [
[
"Gibbons",
"G. W.",
""
]
] | It is shown that Ashtekar and Hansens's Universal Structure at Spatial Infinity (SPI), which has recently be used to establish the conservation of supercharges from past null infity to future null infinity, is an example of a (pseudo-) Carollian structure. The relation to Kinematic Algebras is clarified. |
gr-qc/0505046 | Jaime Fernando Villas da Rocha | R. Chan, M. F. A. da Silva, Jaime F. Villas da Rocha | Perturbed Self-Similar Massless Scalar Field in the Spacetimes with
Circular Symmetry in 2+1 Gravity | no figures | Int.J.Mod.Phys.D14:1725-1738,2005 | 10.1142/S0218271805007309 | null | gr-qc | null | We present in this work the study of the linear perturbations of the
2+1-dimensional circularly symmetric solution, obtained in a previous work,
with kinematic self-similarity of the second kind. We have obtained an exact
solution for the perturbation equations and the possible perturbation modes. We
have shown that ... | [
{
"created": "Tue, 10 May 2005 20:39:22 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Chan",
"R.",
""
],
[
"da Silva",
"M. F. A.",
""
],
[
"da Rocha",
"Jaime F. Villas",
""
]
] | We present in this work the study of the linear perturbations of the 2+1-dimensional circularly symmetric solution, obtained in a previous work, with kinematic self-similarity of the second kind. We have obtained an exact solution for the perturbation equations and the possible perturbation modes. We have shown that th... |
1702.06459 | Aaron Johnson | Kostas Glampedakis, Aaron D. Johnson, Daniel Kennefick | The Darboux transformation in black hole perturbation theory | Accepted for publication in PRD, minor changes have been made to
update to the journal version, 13 pages, 1 table | Phys. Rev. D 96, 024036 (2017) | 10.1103/PhysRevD.96.024036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Darboux transformation between ordinary differential equations is a 19th
century technique that has seen wide use in quantum theory for producing
exactly solvable potentials for the Schr\"odinger equation with specific
spectral properties. In this paper we show that the same transformation appears
in black hole t... | [
{
"created": "Tue, 21 Feb 2017 16:10:58 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jul 2017 23:34:33 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Jul 2017 17:22:41 GMT",
"version": "v3"
}
] | 2017-08-02 | [
[
"Glampedakis",
"Kostas",
""
],
[
"Johnson",
"Aaron D.",
""
],
[
"Kennefick",
"Daniel",
""
]
] | The Darboux transformation between ordinary differential equations is a 19th century technique that has seen wide use in quantum theory for producing exactly solvable potentials for the Schr\"odinger equation with specific spectral properties. In this paper we show that the same transformation appears in black hole the... |
0902.2490 | Jakub Mielczarek | Jakub Mielczarek | Tensor power spectrum with holonomy corrections in LQC | 13 pages, 12 figures. Numerical computations improved. Major revision | Phys.Rev.D79:123520,2009 | 10.1103/PhysRevD.79.123520 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider tensor perturbations produced at a bounce phase in
presence of the holonomy corrections. Here bounce phase and holonomy
corrections originate from Loop Quantum Cosmology. We re-derive formulas for
the corrections for the model with a scalar field content. Background dynamics
with a free scal... | [
{
"created": "Sat, 14 Feb 2009 19:14:15 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2009 21:50:17 GMT",
"version": "v2"
}
] | 2009-07-09 | [
[
"Mielczarek",
"Jakub",
""
]
] | In this paper we consider tensor perturbations produced at a bounce phase in presence of the holonomy corrections. Here bounce phase and holonomy corrections originate from Loop Quantum Cosmology. We re-derive formulas for the corrections for the model with a scalar field content. Background dynamics with a free scalar... |
2003.00044 | Astrid Eichhorn | Astrid Eichhorn | Asymptotically safe gravity | 14 pages plus references, prepared for the proceedings of the 57th
Course of the Erice International School of Subnuclear Physics, "In search
for the unexpected", June 2019 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is an introduction to asymptotically safe quantum gravity, explaining
the main idea of asymptotic safety and how it could solve the problem of
predictivity in quantum gravity. In the first part, the concept of an
asymptotically safe fixed point is discussed within the functional
Renormalization Group framework f... | [
{
"created": "Fri, 28 Feb 2020 20:02:32 GMT",
"version": "v1"
}
] | 2020-03-03 | [
[
"Eichhorn",
"Astrid",
""
]
] | This is an introduction to asymptotically safe quantum gravity, explaining the main idea of asymptotic safety and how it could solve the problem of predictivity in quantum gravity. In the first part, the concept of an asymptotically safe fixed point is discussed within the functional Renormalization Group framework for... |
2202.05643 | Alessandro Nagar | Alessandro Nagar, James Healy, Carlos O. Lousto, Sebastiano Bernuzzi,
and Angelica Albertini | Numerical-relativity validation of effective-one-body waveforms in the
intermediate-mass-ratio regime | 15 pages, 14 figures, submitted to Phys. Rev. D | null | 10.1103/PhysRevD.105.124061 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the open problems in developing binary black hole (BBH) waveforms for
gravitational wave astronomy is to model the intermediate mass ratio regime and
connect it to the extreme mass ratio regime. A natural approach is to employ
the effective one body (EOB) approach to the two-body dynamics that, by design,
can ... | [
{
"created": "Fri, 11 Feb 2022 14:32:24 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Nagar",
"Alessandro",
""
],
[
"Healy",
"James",
""
],
[
"Lousto",
"Carlos O.",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Albertini",
"Angelica",
""
]
] | One of the open problems in developing binary black hole (BBH) waveforms for gravitational wave astronomy is to model the intermediate mass ratio regime and connect it to the extreme mass ratio regime. A natural approach is to employ the effective one body (EOB) approach to the two-body dynamics that, by design, can co... |
1205.6877 | Mohamad Shalaby | Mohamad Shalaby | Dynamics and Light Propagation in a Universe with Discrete Matter
Content | submitted as AIIMS diploma essay at http://archive.aims.ac.za/2010 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a model for a universe with discrete matter content instead of the
continuous perfect fluid taken in FRW models. We show how the redshift in such
a universe deviates from the corresponding one in an FRW cosmology. This
illustrates the fact that averaging the matter content in a universe and then
evolving i... | [
{
"created": "Thu, 31 May 2012 03:41:08 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jun 2012 22:40:11 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Jun 2012 16:08:46 GMT",
"version": "v3"
}
] | 2012-06-07 | [
[
"Shalaby",
"Mohamad",
""
]
] | We discuss a model for a universe with discrete matter content instead of the continuous perfect fluid taken in FRW models. We show how the redshift in such a universe deviates from the corresponding one in an FRW cosmology. This illustrates the fact that averaging the matter content in a universe and then evolving it ... |
1009.5595 | Mattias N. R. Wohlfarth | Felix Tennie, Mattias N.R. Wohlfarth | Consistent matter couplings for Plebanski gravity | 20 pages | Phys.Rev.D82:104052,2010 | 10.1103/PhysRevD.82.104052 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a scheme for the minimal coupling of all standard types of tensor
and spinor field matter to Plebanski gravity. This theory is a geometric
reformulation of vacuum general relativity in terms of two-form frames and
connection one-forms, and provides a covariant basis for various quantization
approaches. Usi... | [
{
"created": "Tue, 28 Sep 2010 15:10:43 GMT",
"version": "v1"
}
] | 2010-12-23 | [
[
"Tennie",
"Felix",
""
],
[
"Wohlfarth",
"Mattias N. R.",
""
]
] | We develop a scheme for the minimal coupling of all standard types of tensor and spinor field matter to Plebanski gravity. This theory is a geometric reformulation of vacuum general relativity in terms of two-form frames and connection one-forms, and provides a covariant basis for various quantization approaches. Using... |
2203.06767 | Emilio Elizalde | Emilio Elizalde, Martiros Khurshudyan, K. Myrzakulov and S. Bekov | Reconstruction of the quintessence dark energy potential from a Gaussian
process | 15 pages, 10 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The quintessence dark energy potential is reconstructed in a
model-independent way. Reconstruction relies on a Gaussian process and on
available expansion-rate data. Specifically, 40-point values of $H(z)$ are
used, consisting of a 30-point sample deduced from a differential age method
and an additional 10-point samp... | [
{
"created": "Sun, 13 Mar 2022 21:36:50 GMT",
"version": "v1"
}
] | 2022-03-15 | [
[
"Elizalde",
"Emilio",
""
],
[
"Khurshudyan",
"Martiros",
""
],
[
"Myrzakulov",
"K.",
""
],
[
"Bekov",
"S.",
""
]
] | The quintessence dark energy potential is reconstructed in a model-independent way. Reconstruction relies on a Gaussian process and on available expansion-rate data. Specifically, 40-point values of $H(z)$ are used, consisting of a 30-point sample deduced from a differential age method and an additional 10-point sample... |
0707.0128 | John T. Whelan | Reinhard Prix and John T. Whelan | F-statistic search for white-dwarf binaries in the first Mock LISA Data
Challenge | submitted to CQG for proceedings of 11th GW Data Analysis workshop | Class.Quant.Grav.24:S565-S574,2007 | 10.1088/0264-9381/24/19/S19 | LIGO-P070029-01-Z | gr-qc | null | The F-statistic is an optimal detection statistic for continuous
gravitational waves, i.e., long-duration (quasi-)monochromatic signals with
slowly-varying intrinsic frequency. This method was originally developed in the
context of ground-based detectors, but it is equally applicable to LISA where
many signals fall i... | [
{
"created": "Sun, 1 Jul 2007 21:37:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Prix",
"Reinhard",
""
],
[
"Whelan",
"John T.",
""
]
] | The F-statistic is an optimal detection statistic for continuous gravitational waves, i.e., long-duration (quasi-)monochromatic signals with slowly-varying intrinsic frequency. This method was originally developed in the context of ground-based detectors, but it is equally applicable to LISA where many signals fall int... |
1005.0935 | Giovanni Venturi | A. Cerioni, F. Finelli, A. Tronconi, G. Venturi | Inflation and Reheating in Spontaneously Generated Gravity | 15 pages, 10 figures, to be published in Phys. Rev. D | Phys.Rev.D81:123505,2010 | 10.1103/PhysRevD.81.123505 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inflation is studied in the context of induced gravity (IG) $\gamma \sigma^2
R$, where $R$ is the Ricci scalar, $\sigma$ a scalar field and $\gamma$ a
dimensionless constant, and diverse symmetry-breaking potentials $V(\sigma)$
are considered. In particular we compared the predictions for Landau-Ginzburg
(LG) and Col... | [
{
"created": "Thu, 6 May 2010 09:03:32 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Cerioni",
"A.",
""
],
[
"Finelli",
"F.",
""
],
[
"Tronconi",
"A.",
""
],
[
"Venturi",
"G.",
""
]
] | Inflation is studied in the context of induced gravity (IG) $\gamma \sigma^2 R$, where $R$ is the Ricci scalar, $\sigma$ a scalar field and $\gamma$ a dimensionless constant, and diverse symmetry-breaking potentials $V(\sigma)$ are considered. In particular we compared the predictions for Landau-Ginzburg (LG) and Colem... |
2309.12087 | Pierre Vanhove | Philippe Brax, Pierre Vanhove | Scalaron dynamics from UV to IR | v2: expanded version with new appendices and references. 35 pages.
Version to appear in Physical Review D | null | null | IPHT-t23/049, LAPTH-033/23 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider a scenario where the scalaron of $f({\cal R})$ models is related
to the volume modulus of string compactifications leaving only one scalar
degree of freedom at low energy. The coefficient of the leading curvature
squared contribution to the low energy effective action of gravity determines
the mass of the... | [
{
"created": "Thu, 21 Sep 2023 13:58:03 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2024 08:29:59 GMT",
"version": "v2"
}
] | 2024-03-20 | [
[
"Brax",
"Philippe",
""
],
[
"Vanhove",
"Pierre",
""
]
] | We consider a scenario where the scalaron of $f({\cal R})$ models is related to the volume modulus of string compactifications leaving only one scalar degree of freedom at low energy. The coefficient of the leading curvature squared contribution to the low energy effective action of gravity determines the mass of the s... |
2112.03869 | Victor Danchev Mr. | Victor I. Danchev, Daniela D. Doneva and Stoytcho S. Yazadjiev | Constraining scalarization in scalar-Gauss-Bonnet gravity through binary
pulsars | 17 pages, 6 figures v2: Improvements made, additional references
added, v3: Improvements of data analysis methods and text, v4: Improvements
of data analysis, matches the published version | null | 10.1103/PhysRevD.106.124001 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we derive strong constrains on scalarization in
scalar-Gauss-Bonnet (sGB) gravity using observations of pulsars in close binary
systems. Since scalarized neutron stars carry a nonzero scalar change, they
emit scalar dipole radiation while inspiraling which speeds up the orbital
decay. The observa... | [
{
"created": "Tue, 7 Dec 2021 18:02:38 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jan 2022 18:23:52 GMT",
"version": "v2"
},
{
"created": "Sat, 28 May 2022 14:30:04 GMT",
"version": "v3"
},
{
"created": "Thu, 17 Nov 2022 21:30:53 GMT",
"version": "v4"
}
] | 2022-12-14 | [
[
"Danchev",
"Victor I.",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | In the present paper we derive strong constrains on scalarization in scalar-Gauss-Bonnet (sGB) gravity using observations of pulsars in close binary systems. Since scalarized neutron stars carry a nonzero scalar change, they emit scalar dipole radiation while inspiraling which speeds up the orbital decay. The observati... |
2308.12140 | Harsh Narola | Harsh Narola, Justin Janquart, Quirijn Meijer, K. Haris, and Chris Van
Den Broeck | Relative binning for complete gravitational-wave parameter estimation
with higher-order modes and precession, and applications to lensing and
third-generation detectors | Minor changes before journal submission, attempt 2 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Once a gravitational wave signal is detected, the measurement of its source
parameters is important to achieve various scientific goals. This is done
through Bayesian inference, where the analysis cost increases with the model
complexity and the signal duration. For typical binary black hole signals with
precession a... | [
{
"created": "Wed, 23 Aug 2023 13:55:26 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Aug 2023 17:52:54 GMT",
"version": "v2"
}
] | 2023-08-29 | [
[
"Narola",
"Harsh",
""
],
[
"Janquart",
"Justin",
""
],
[
"Meijer",
"Quirijn",
""
],
[
"Haris",
"K.",
""
],
[
"Broeck",
"Chris Van Den",
""
]
] | Once a gravitational wave signal is detected, the measurement of its source parameters is important to achieve various scientific goals. This is done through Bayesian inference, where the analysis cost increases with the model complexity and the signal duration. For typical binary black hole signals with precession and... |
1309.5519 | Pankaj Sheoran | Sushant G. Ghosh, Pankaj Sheoran | Higher dimensional non-Kerr black hole and energy extraction | 14 pages, 6 figures, 6 tables, analysis extended upto 10 dimensions,
published in PRD | Phys. Rev. D 89, 024023 (2014) | 10.1103/PhysRevD.89.024023 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of the horizons and ergosphere in a rotating
higher dimensional (HD) deformed Kerr-like black hole. We also explicitly bring
out the effect of deformation parameter $\epsilon$ and the extra dimension on
the efficiency of the Penrose process of energy extraction from a black hole.
It is i... | [
{
"created": "Sat, 21 Sep 2013 19:19:20 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2014 16:42:51 GMT",
"version": "v2"
}
] | 2014-02-17 | [
[
"Ghosh",
"Sushant G.",
""
],
[
"Sheoran",
"Pankaj",
""
]
] | We investigate the properties of the horizons and ergosphere in a rotating higher dimensional (HD) deformed Kerr-like black hole. We also explicitly bring out the effect of deformation parameter $\epsilon$ and the extra dimension on the efficiency of the Penrose process of energy extraction from a black hole. It is int... |
1512.02291 | Arthur Suvorov Mr. | Arthur George Suvorov and Andrew Melatos | Testing modified gravity and no-hair relations for the Kerr-Newman
metric through quasi-periodic oscillations of galactic microquasars | 14 pages, 5 figures; Accepted for publication in PRD | Phys. Rev. D 93, 024004 (2016) | 10.1103/PhysRevD.93.024004 | null | gr-qc astro-ph.HE math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct multipole moments for stationary, asymptotically flat, spacetime
solutions to higher-order curvature theories of gravity. The moments are
defined using $3+1$ techniques involving timelike Killing vector constructions
as in the classic papers by Geroch and Hansen. Using the fact that the
Kerr-Newman metri... | [
{
"created": "Tue, 8 Dec 2015 00:27:03 GMT",
"version": "v1"
}
] | 2016-01-13 | [
[
"Suvorov",
"Arthur George",
""
],
[
"Melatos",
"Andrew",
""
]
] | We construct multipole moments for stationary, asymptotically flat, spacetime solutions to higher-order curvature theories of gravity. The moments are defined using $3+1$ techniques involving timelike Killing vector constructions as in the classic papers by Geroch and Hansen. Using the fact that the Kerr-Newman metric ... |
gr-qc/9808062 | Mattias Marklund | M. Marklund (U. of Umea), M. Bradley (U. of Umea) | Invariant construction of solutions to Einstein's field equations - LRS
perfect fluids II | 24 pages, 1 figure | Class.Quant.Grav. 16 (1999) 1577-1597 | 10.1088/0264-9381/16/5/308 | mth.uct.ac.za-9808 | gr-qc | null | The properties of LRS class II perfect fluid space-times are analyzed using
the description of geometries in terms of the Riemann tensor and a finite
number of its covariant derivatives. In this manner it is straightforward to
obtain the plane and hyperbolic analogues to the spherical symmetric case. For
spherically ... | [
{
"created": "Mon, 24 Aug 1998 13:03:41 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Marklund",
"M.",
"",
"U. of Umea"
],
[
"Bradley",
"M.",
"",
"U. of Umea"
]
] | The properties of LRS class II perfect fluid space-times are analyzed using the description of geometries in terms of the Riemann tensor and a finite number of its covariant derivatives. In this manner it is straightforward to obtain the plane and hyperbolic analogues to the spherical symmetric case. For spherically sy... |
1602.05764 | Matthew Wright | Matthew Wright | Conformal transformations in modified teleparallel theories of gravity
revisited | 13 pages, 1 figure | Phys. Rev. D 93, 103002 (2016) | 10.1103/PhysRevD.93.103002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that one cannot apply a conformal transformation to $f(T)$
gravity to obtain a minimally coupled scalar field model, and thus no Einstein
frame exists for $f(T)$ gravity. Furthermore nonminimally coupled "teleparallel
dark energy models" are not conformally equivalent to $f(T)$ gravity. However,
it c... | [
{
"created": "Thu, 18 Feb 2016 11:34:44 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2016 13:15:49 GMT",
"version": "v2"
}
] | 2016-05-05 | [
[
"Wright",
"Matthew",
""
]
] | It is well known that one cannot apply a conformal transformation to $f(T)$ gravity to obtain a minimally coupled scalar field model, and thus no Einstein frame exists for $f(T)$ gravity. Furthermore nonminimally coupled "teleparallel dark energy models" are not conformally equivalent to $f(T)$ gravity. However, it can... |
2211.06880 | Marcello Seri | Martijn Kluitenberg, Diederik Roest, Marcello Seri | Chaotic light scattering around extremal black holes | Refereed version | Bollettino dell'Unione Matematica Italiana 16.2 (2023): 381-396 | 10.1007/s40574-022-00345-5 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the scattering of light in the field of $N\geq 3$ static
extremal black holes is chaotic in the planar case. The relativistic dynamics
of such extremal objects reduce to that of a classical Hamiltonian system.
Certain values of the dilaton coupling then allow one to apply techniques from
symbolic dynamic... | [
{
"created": "Sun, 13 Nov 2022 11:23:55 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2022 10:55:07 GMT",
"version": "v2"
}
] | 2023-12-21 | [
[
"Kluitenberg",
"Martijn",
""
],
[
"Roest",
"Diederik",
""
],
[
"Seri",
"Marcello",
""
]
] | We show that the scattering of light in the field of $N\geq 3$ static extremal black holes is chaotic in the planar case. The relativistic dynamics of such extremal objects reduce to that of a classical Hamiltonian system. Certain values of the dilaton coupling then allow one to apply techniques from symbolic dynamics ... |
gr-qc/0505140 | Yuri Pavlov | A. A. Grib and Yu. V. Pavlov | Some effects of the quantum field theory in the early Universe | LATEX, 21 pages, no figure | In: "Focus on Quantum Field Theory", ed. O. Kovras, Nova Science
Publishers, Inc., New York, 2005, pp. 1-21. | null | null | gr-qc hep-th | null | Effects of the vacuum polarization leading to change of the effective
gravitational constant and particle creation in the early Universe are
discussed. Gauss-Bonnet type coupling to the curvature is considered.
Renormalization methods are generalized for such coupling and the N-dimensional
space-time. Calculations of... | [
{
"created": "Fri, 27 May 2005 12:31:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | Effects of the vacuum polarization leading to change of the effective gravitational constant and particle creation in the early Universe are discussed. Gauss-Bonnet type coupling to the curvature is considered. Renormalization methods are generalized for such coupling and the N-dimensional space-time. Calculations of c... |
2205.13677 | David Quispe Aruquipa | David Q. Aruquipa and Marc Casals | Hadamard Tail from Initial Data on the Light Cone | 15 pages, 5 figures | null | 10.1103/PhysRevD.107.084008 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Field perturbations of a curved background spacetime generally propagate not
only at the speed of light but also at all smaller velocities. This so-called
$Hadamard\,tail$ contribution to wave propagation is relevant in various
settings, from classical self-force calculations to communication between
quantum particle... | [
{
"created": "Thu, 26 May 2022 23:43:51 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2023 17:35:22 GMT",
"version": "v2"
}
] | 2023-04-11 | [
[
"Aruquipa",
"David Q.",
""
],
[
"Casals",
"Marc",
""
]
] | Field perturbations of a curved background spacetime generally propagate not only at the speed of light but also at all smaller velocities. This so-called $Hadamard\,tail$ contribution to wave propagation is relevant in various settings, from classical self-force calculations to communication between quantum particle d... |
1511.01625 | Sunil Maurya DR. | S.K. Maurya, Y.K. Gupta, Baiju Dayanandan, M. K. Jasim, Ahmed Al-Jamel | Generalized relativistic anisotropic models for compact stars | 18 pages, 13 figures (Submitted in Eur. Phys. J. C) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new anisotropic generalization of Buchdahl [1] type perfect fluid
solution by using the method of earlier work [2]. In similar approach we have
constructed the new pressure anisotropy factor ${\Delta}$ by the help both the
metric potential $e^{\lambda}$ and $e^{\nu}$. The metric potential
$e^{\lambda}$ sam... | [
{
"created": "Thu, 5 Nov 2015 06:33:30 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Nov 2015 15:21:55 GMT",
"version": "v2"
}
] | 2015-11-26 | [
[
"Maurya",
"S. K.",
""
],
[
"Gupta",
"Y. K.",
""
],
[
"Dayanandan",
"Baiju",
""
],
[
"Jasim",
"M. K.",
""
],
[
"Al-Jamel",
"Ahmed",
""
]
] | We present new anisotropic generalization of Buchdahl [1] type perfect fluid solution by using the method of earlier work [2]. In similar approach we have constructed the new pressure anisotropy factor ${\Delta}$ by the help both the metric potential $e^{\lambda}$ and $e^{\nu}$. The metric potential $e^{\lambda}$ same ... |
gr-qc/0701122 | Andrea Passamonti | Adamantios Stavridis, Andrea Passamonti, Kostas Kokkotas | Nonradial oscillations of slowly and differentially rotating compact
stars | 18 pages, 5 figures, ReVTeX 4.0, submitted to Phys. Rev. D | Phys.Rev.D75:064019,2007 | 10.1103/PhysRevD.75.064019 | null | gr-qc astro-ph | null | The equations describing nonradial adiabatic oscillations of differentially
rotating relativistic stars are derived in relativistic slow rotation
approximation. The differentially rotating configuration is described by a
perturbative version of the relativistic j-constant rotation law. Focusing on
the oscillation pro... | [
{
"created": "Mon, 22 Jan 2007 16:38:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Stavridis",
"Adamantios",
""
],
[
"Passamonti",
"Andrea",
""
],
[
"Kokkotas",
"Kostas",
""
]
] | The equations describing nonradial adiabatic oscillations of differentially rotating relativistic stars are derived in relativistic slow rotation approximation. The differentially rotating configuration is described by a perturbative version of the relativistic j-constant rotation law. Focusing on the oscillation prope... |
1408.6041 | Juhua Chen | Sheng Zhou, Ruanjing Zhang, Juhua Chen and Yongjiu Wang | Geodesic structure of Janis-Newman-Winicour space-time | 19 pages,39 figs | null | 10.1007/s10773-015-2526-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we study the geodesic structure of the
Janis-Newman-Winicour(JNW) space-time which contains a strong curvature naked
singularity. This metric is an extension of the Schwarzschild geometry when a
massless scalar field is included. We find that the strength parameter $\mu$ of
the scalar field effec... | [
{
"created": "Tue, 26 Aug 2014 07:51:13 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Zhou",
"Sheng",
""
],
[
"Zhang",
"Ruanjing",
""
],
[
"Chen",
"Juhua",
""
],
[
"Wang",
"Yongjiu",
""
]
] | In the present paper we study the geodesic structure of the Janis-Newman-Winicour(JNW) space-time which contains a strong curvature naked singularity. This metric is an extension of the Schwarzschild geometry when a massless scalar field is included. We find that the strength parameter $\mu$ of the scalar field effects... |
gr-qc/9604047 | Friedrich Wilhelm Hehl | Yuval Ne'eman (Tel-Aviv Univ. and Univ. of Texas at Austin) and
Friedrich W. Hehl (Univ. of Cologne) | Test Matter in a Spacetime with Nonmetricity | 14 pages, file in latex | Class.Quant.Grav.14:A251-A260,1997 | 10.1088/0264-9381/14/1A/020 | TAUP N-253-96 | gr-qc hep-th | null | Examples in which spacetime might become non-Riemannian appear above Planck
energies in string theory or, in the very early universe, in the inflationary
model. The simplest such geometry is metric-affine geometry, in which {\it
nonmetricity} appears as a field strength, side by side with curvature and
torsion. In ma... | [
{
"created": "Wed, 24 Apr 1996 16:02:56 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Ne'eman",
"Yuval",
"",
"Tel-Aviv Univ. and Univ. of Texas at Austin"
],
[
"Hehl",
"Friedrich W.",
"",
"Univ. of Cologne"
]
] | Examples in which spacetime might become non-Riemannian appear above Planck energies in string theory or, in the very early universe, in the inflationary model. The simplest such geometry is metric-affine geometry, in which {\it nonmetricity} appears as a field strength, side by side with curvature and torsion. In matt... |
1910.10388 | Anjali Ramesh | Anjali Ramesh | Generalized uncertainty principle for a Dirac fermion in a torsion field | 16 pages, 14 figures | null | 10.1088/1361-6382/ab7c00 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We derive the uncertainty principle for a Dirac fermion in a torsion field
obeying the Hehl-Datta (HD) equation. We first discuss that there should be a
correction factor to the Heisenberg uncertainty principle (HUP) when torsional
effects are taken into consideration. We then derive the uncertainty relation
from a s... | [
{
"created": "Wed, 23 Oct 2019 07:12:05 GMT",
"version": "v1"
}
] | 2020-06-17 | [
[
"Ramesh",
"Anjali",
""
]
] | We derive the uncertainty principle for a Dirac fermion in a torsion field obeying the Hehl-Datta (HD) equation. We first discuss that there should be a correction factor to the Heisenberg uncertainty principle (HUP) when torsional effects are taken into consideration. We then derive the uncertainty relation from a sol... |
2212.04482 | Gabriele Montefalcone | Gabriele Montefalcone, Vikas Aragam, Luca Visinelli and Katherine
Freese | Observational Constraints on Warm Natural Inflation | 23 pages, 3 figures, 1 table, Replacement due to typo on DOE
acknowledgement number | JCAP 2303, 002 (2023) | 10.1088/1475-7516/2023/03/002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Warm natural inflation is studied for the case of the original cosine
potential. The radiation bath during inflation induces a dissipation (friction)
rate in the equation of motion for the inflaton field, which can potentially
reduce the field excursion needed for an observationally viable period of
inflation. We exa... | [
{
"created": "Thu, 8 Dec 2022 18:54:44 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2023 02:56:54 GMT",
"version": "v2"
}
] | 2023-03-08 | [
[
"Montefalcone",
"Gabriele",
""
],
[
"Aragam",
"Vikas",
""
],
[
"Visinelli",
"Luca",
""
],
[
"Freese",
"Katherine",
""
]
] | Warm natural inflation is studied for the case of the original cosine potential. The radiation bath during inflation induces a dissipation (friction) rate in the equation of motion for the inflaton field, which can potentially reduce the field excursion needed for an observationally viable period of inflation. We exami... |
1603.07830 | Maciej Wielgus | M. A. Abramowicz, T. Bulik, G. F. R. Ellis, K. A. Meissner, M. Wielgus | The electromagnetic afterglows of gravitational waves as a test for
Quantum Gravity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that if particularly powerful electromagnetic afterglows of the
gravitational waves bursts will be observed in the future, this could be used
as a strong observational support for some suggested quantum alternatives for
black holes (e.g., firewalls and gravastars). A universal absence of powerful
afterglows ... | [
{
"created": "Fri, 25 Mar 2016 06:44:00 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Apr 2016 23:13:24 GMT",
"version": "v2"
}
] | 2016-04-14 | [
[
"Abramowicz",
"M. A.",
""
],
[
"Bulik",
"T.",
""
],
[
"Ellis",
"G. F. R.",
""
],
[
"Meissner",
"K. A.",
""
],
[
"Wielgus",
"M.",
""
]
] | We argue that if particularly powerful electromagnetic afterglows of the gravitational waves bursts will be observed in the future, this could be used as a strong observational support for some suggested quantum alternatives for black holes (e.g., firewalls and gravastars). A universal absence of powerful afterglows sh... |
gr-qc/0007036 | Joao Magueijo | Joao Magueijo (Imperial College) | Covariant and locally Lorentz-invariant varying speed of light theories | To be published in Physical Review D | Phys.Rev. D62 (2000) 103521 | 10.1103/PhysRevD.62.103521 | null | gr-qc astro-ph hep-th | null | We propose definitions for covariance and local Lorentz invariance applicable
when the speed of light $c$ is allowed to vary. They have the merit of
retaining only those aspects of the usual definitions which are invariant under
unit transformations, and which can therefore legitimately represent the
outcome of an ex... | [
{
"created": "Mon, 17 Jul 2000 15:31:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Magueijo",
"Joao",
"",
"Imperial College"
]
] | We propose definitions for covariance and local Lorentz invariance applicable when the speed of light $c$ is allowed to vary. They have the merit of retaining only those aspects of the usual definitions which are invariant under unit transformations, and which can therefore legitimately represent the outcome of an expe... |
2001.06990 | Junpei Harada | Junpei Harada | Connection independent formulation of general relativity | 4 pages, to appear in PRD, a reference added | Phys. Rev. D 101, 024053 (2020) | 10.1103/PhysRevD.101.024053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A connection-independent formulation of general relativity is presented, in
which the dynamics does not depend on the choice of connection. The gravity
action in this formulation includes one additional scalar term in addition to
the Einstein-Hilbert action. No conditions on the connection are imposed.
Nevertheless, ... | [
{
"created": "Mon, 20 Jan 2020 06:12:17 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2020 06:54:55 GMT",
"version": "v2"
}
] | 2021-05-20 | [
[
"Harada",
"Junpei",
""
]
] | A connection-independent formulation of general relativity is presented, in which the dynamics does not depend on the choice of connection. The gravity action in this formulation includes one additional scalar term in addition to the Einstein-Hilbert action. No conditions on the connection are imposed. Nevertheless, th... |
1812.02961 | Guido Magnano | Guido Magnano, Krzysztof A. Meissner, Leszek M. Soko{\L}Owski | Test-field limit of metric nonlinear gravity theories | Title and abstract modified to make the content of the paper more
clear and readable | null | 10.1140/epjc/s10052-019-7124-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of alternative metric gravity theories, it has been shown by
several authors that a generic Lagrangian depending on the Riemann tensor
describes a theory with 8 degrees of freedom (which reduce to 3 for f(R)
Lagrangians depending only on the curvature scalar). This result is often
related to a reform... | [
{
"created": "Fri, 7 Dec 2018 09:49:14 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2019 14:26:52 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Magnano",
"Guido",
""
],
[
"Meissner",
"Krzysztof A.",
""
],
[
"SokoŁOwski",
"Leszek M.",
""
]
] | In the framework of alternative metric gravity theories, it has been shown by several authors that a generic Lagrangian depending on the Riemann tensor describes a theory with 8 degrees of freedom (which reduce to 3 for f(R) Lagrangians depending only on the curvature scalar). This result is often related to a reformul... |
1011.3153 | Vojtech Pravda | Marcello Ortaggio, Vojtech Pravda, Alena Pravdova | On higher dimensional Einstein spacetimes with a warped extra dimension | 14 pages, minor changes in the text, mainly in Section 2.1 | Class. Quant. Grav. 28:105006, 2011 | 10.1088/0264-9381/28/10/105006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a class of higher dimensional warped Einstein spacetimes with one
extra dimension. These were originally identified by Brinkmann as those
Einstein spacetimes that can be mapped conformally on other Einstein
spacetimes, and have subsequently appeared in various contexts to describe,
e.g., different braneworld... | [
{
"created": "Sat, 13 Nov 2010 18:55:07 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2011 18:24:52 GMT",
"version": "v2"
}
] | 2011-04-08 | [
[
"Ortaggio",
"Marcello",
""
],
[
"Pravda",
"Vojtech",
""
],
[
"Pravdova",
"Alena",
""
]
] | We study a class of higher dimensional warped Einstein spacetimes with one extra dimension. These were originally identified by Brinkmann as those Einstein spacetimes that can be mapped conformally on other Einstein spacetimes, and have subsequently appeared in various contexts to describe, e.g., different braneworld m... |
1105.2346 | Edward Glass | J.P. Krisch and E.N. Glass | Levi-Civita cylinders with fractional angular deficit | 5 figures | J.Math.Phys.52:052503,2011 | 10.1063/1.3579130 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The angular deficit factor in the Levi-Civita vacuum metric has been
parametrized using a Riemann-Liouville fractional integral. This introduces a
new parameter into the general relativistic cylinder description, the
fractional index {\alpha}. When the fractional index is continued into the
negative {\alpha} region, ... | [
{
"created": "Thu, 12 May 2011 00:49:00 GMT",
"version": "v1"
}
] | 2011-07-26 | [
[
"Krisch",
"J. P.",
""
],
[
"Glass",
"E. N.",
""
]
] | The angular deficit factor in the Levi-Civita vacuum metric has been parametrized using a Riemann-Liouville fractional integral. This introduces a new parameter into the general relativistic cylinder description, the fractional index {\alpha}. When the fractional index is continued into the negative {\alpha} region, ne... |
1707.05680 | Shahar Hod | Shahar Hod | Marginally bound (critical) geodesics of rapidly rotating black holes | 10 pages. arXiv admin note: substantial text overlap with
arXiv:1210.2486 | Physical Review D 88, 087502 (2013) | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most important geodesics in a black-hole spacetime is the
marginally bound spherical orbit. This critical geodesic represents the
innermost spherical orbit which is bound to the central black hole. The radii
$r_{\text{mb}}({\bar a})$ of the marginally bound {\it equatorial} circular
geodesics of rotating K... | [
{
"created": "Mon, 17 Jul 2017 16:53:34 GMT",
"version": "v1"
}
] | 2017-07-19 | [
[
"Hod",
"Shahar",
""
]
] | One of the most important geodesics in a black-hole spacetime is the marginally bound spherical orbit. This critical geodesic represents the innermost spherical orbit which is bound to the central black hole. The radii $r_{\text{mb}}({\bar a})$ of the marginally bound {\it equatorial} circular geodesics of rotating Ker... |
2010.15445 | Isha Kotecha | Isha Kotecha | On Generalised Statistical Equilibrium and Discrete Quantum Gravity | PhD thesis, Humboldt University of Berlin, Albert Einstein Institute
- Potsdam; v2 few minor changes and updated references, to be published in
Springer Theses book series | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Statistical equilibrium configurations are important in the physics of
macroscopic systems with a large number of constituent degrees of freedom. They
are expected to be crucial also in discrete quantum gravity, where dynamical
spacetime should emerge from the collective physics of the underlying quantum
gravitationa... | [
{
"created": "Thu, 29 Oct 2020 09:36:52 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 2021 10:02:55 GMT",
"version": "v2"
}
] | 2021-09-14 | [
[
"Kotecha",
"Isha",
""
]
] | Statistical equilibrium configurations are important in the physics of macroscopic systems with a large number of constituent degrees of freedom. They are expected to be crucial also in discrete quantum gravity, where dynamical spacetime should emerge from the collective physics of the underlying quantum gravitational ... |
2106.14672 | Francesco Gozzini | Pietro Dona, Francesco Gozzini, Alessandro Nicotra | A Wick rotation for EPRL spin foam models | 25 pages, 1 figure | Phys.Rev.D 104 (2021) 12, 126008 | 10.1103/PhysRevD.104.126008 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We show that the Euclidean and Lorentzian EPRL vertex amplitudes of covariant
Loop Quantum Gravity are related through a ``Wick rotation'' of the real
Immirzi parameter to purely imaginary values. Our result follows from the
simultaneous analytic continuation of the algebras, group elements and unitary
irreducible re... | [
{
"created": "Mon, 28 Jun 2021 12:52:03 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Dona",
"Pietro",
""
],
[
"Gozzini",
"Francesco",
""
],
[
"Nicotra",
"Alessandro",
""
]
] | We show that the Euclidean and Lorentzian EPRL vertex amplitudes of covariant Loop Quantum Gravity are related through a ``Wick rotation'' of the real Immirzi parameter to purely imaginary values. Our result follows from the simultaneous analytic continuation of the algebras, group elements and unitary irreducible repr... |
1110.1175 | Salvatore Capozziello | S. Capozziello, G. Cristofano, M. De Laurentis | Primordial black holes, astrophysical systems and the Eddington-Weinberg
relation | 5 pages | null | 10.1142/S0217732311036966 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from a quantization relation for primordial black holes, it is shown
that quantum fluctuations can play a fundamental role in determining the
effective scales of self-gravitating astrophysical systems. Furthermore the
Eddington-Weinberg relation between the current scale of the observed universe
to the Planc... | [
{
"created": "Thu, 6 Oct 2011 08:08:35 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Capozziello",
"S.",
""
],
[
"Cristofano",
"G.",
""
],
[
"De Laurentis",
"M.",
""
]
] | Starting from a quantization relation for primordial black holes, it is shown that quantum fluctuations can play a fundamental role in determining the effective scales of self-gravitating astrophysical systems. Furthermore the Eddington-Weinberg relation between the current scale of the observed universe to the Planck ... |
2009.10997 | Diego Rubiera-Garcia | Francisco S. N. Lobo, Gonzalo J. Olmo, Emanuele Orazi, Diego
Rubiera-Garcia, Azmat Rustam | Structure and stability of traversable thin-shell wormholes in Palatini
$f(\mathcal{R})$ gravity | 10 pages, revtex4-1 style. v2: some minor corrections, version
accepted for publication in Phys. Rev. D | Phys. Rev. D 102, 104012 (2020) | 10.1103/PhysRevD.102.104012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the structure and stability of traversable wormholes built as
(spherically symmetric) thin shells in the context of Palatini $f(\mathcal{R})$
gravity. Using a suitable junction formalism for these theories we find that
the effective number of degrees of freedom on the shell is reduced to a single
one, which ... | [
{
"created": "Wed, 23 Sep 2020 08:27:08 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Oct 2020 09:50:40 GMT",
"version": "v2"
}
] | 2020-11-11 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Orazi",
"Emanuele",
""
],
[
"Rubiera-Garcia",
"Diego",
""
],
[
"Rustam",
"Azmat",
""
]
] | We study the structure and stability of traversable wormholes built as (spherically symmetric) thin shells in the context of Palatini $f(\mathcal{R})$ gravity. Using a suitable junction formalism for these theories we find that the effective number of degrees of freedom on the shell is reduced to a single one, which fi... |
0910.5145 | Bogus{\l}aw Broda | Bogus{\l}aw Broda, Micha{\l} Szanecki | Dark energy from quantum fluctuations | 4 pages (in AdP style), 2 references added, prepared for the
proceedings of the Grassmannian Conference in Fundamental Cosmology
(Grasscosmofun'09), 14-19 September 2009, Szczecin, Poland | Annalen Phys.19:312-315,2010 | 10.1002/andp.201010435 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have derived the quantum vacuum pressure P_vac as a primary entity,
removing a trivial and a gauge terms from the cosmological constant-like part
(the zeroth term) of the effective action for a free matter field. The quantum
vacuum energy density G_vac appears a secondary entity, but both are of
expected order. Mo... | [
{
"created": "Tue, 27 Oct 2009 15:33:48 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Nov 2009 12:08:59 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Broda",
"Bogusław",
""
],
[
"Szanecki",
"Michał",
""
]
] | We have derived the quantum vacuum pressure P_vac as a primary entity, removing a trivial and a gauge terms from the cosmological constant-like part (the zeroth term) of the effective action for a free matter field. The quantum vacuum energy density G_vac appears a secondary entity, but both are of expected order. More... |
1704.03691 | Giovanni Rabuffo | Benjamin Bahr, Sebastian Kloser, Giovanni Rabuffo | Towards a Cosmological subsector of Spin Foam Quantum Gravity | 38 pages, 10 figures | Phys. Rev. D 96, 086009 (2017) | 10.1103/PhysRevD.96.086009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the four dimensional path integral for Euclidean quantum gravity
in the context of the EPRL-FK spin foam model. The state sum is restricted to
certain symmetric configurations which resembles the geometry of a flat
homogeneous and isotropic universe. The vertex structure is specially chosen so
that a basic... | [
{
"created": "Wed, 12 Apr 2017 10:37:20 GMT",
"version": "v1"
}
] | 2017-10-25 | [
[
"Bahr",
"Benjamin",
""
],
[
"Kloser",
"Sebastian",
""
],
[
"Rabuffo",
"Giovanni",
""
]
] | We examine the four dimensional path integral for Euclidean quantum gravity in the context of the EPRL-FK spin foam model. The state sum is restricted to certain symmetric configurations which resembles the geometry of a flat homogeneous and isotropic universe. The vertex structure is specially chosen so that a basic c... |
gr-qc/9905108 | Alessandro D.A.M. Spallicci | Alessandro D.A.M. Spallicci | Analytic solution of the Regge-Wheeler differential equation for black
hole pertubations in radial coordinate and time domains | Conference paper of 6 pages. Keywords: Partial differential equations
(35Q75), Equations of motion (83C10), Black holes (83C57) | XIII Convegno Nazionale di Relativita' Generale e Fisica della
Gravitazione, 21-25 September 1998 | null | null | gr-qc | null | An analytic solution of the Regge-Wheeler (RW) equation has been found via
the Frobenius method at the regular singularity of the horizon 2M, in the form
of a time and radial coordinate dependent series. The RW partial differential
equation, derived from the Einstein field equations, represents the first order
pertur... | [
{
"created": "Mon, 31 May 1999 10:24:18 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Spallicci",
"Alessandro D. A. M.",
""
]
] | An analytic solution of the Regge-Wheeler (RW) equation has been found via the Frobenius method at the regular singularity of the horizon 2M, in the form of a time and radial coordinate dependent series. The RW partial differential equation, derived from the Einstein field equations, represents the first order perturba... |
0704.3606 | John Ward Mr | Tapan Naskar and John Ward | Type I singularities and the Phantom Menace | More references added. Final PRD version | Phys.Rev.D76:063514,2007 | 10.1103/PhysRevD.76.063514 | null | gr-qc hep-ph | null | We consider the future dynamics of a transient phantom dominated phase of the
universe in LQC and in the RS braneworld, which both have a non-standard
Friedmann equation. We find that for a certain class of potentials, the Hubble
parameter oscillates with simple harmonic motion in the LQC case and therefore
avoids an... | [
{
"created": "Thu, 26 Apr 2007 19:07:10 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2007 12:20:26 GMT",
"version": "v2"
},
{
"created": "Tue, 22 May 2007 10:22:39 GMT",
"version": "v3"
},
{
"created": "Thu, 11 Oct 2007 21:15:08 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Naskar",
"Tapan",
""
],
[
"Ward",
"John",
""
]
] | We consider the future dynamics of a transient phantom dominated phase of the universe in LQC and in the RS braneworld, which both have a non-standard Friedmann equation. We find that for a certain class of potentials, the Hubble parameter oscillates with simple harmonic motion in the LQC case and therefore avoids any ... |
2011.12368 | Indranil Chakraborty | Siddhant Siddhant, Indranil Chakraborty, Sayan Kar (IIT Kharagpur,
India) | Kundt geometries and memory effects in the Brans-Dicke theory of gravity | Some minor typos corrected, matches with the published version in
EPJC | null | 10.1140/epjc/s10052-021-09118-4 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | Memory effects are studied in the simplest scalar-tensor theory, the
Brans--Dicke (BD) theory. To this end, we introduce, in BD theory, novel Kundt
spacetimes (without and with gyratonic terms), which serve as backgrounds for
the ensuing analysis on memory. The BD parameter $\omega$ and the scalar field
($\phi$) prof... | [
{
"created": "Tue, 24 Nov 2020 20:42:29 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2021 07:27:31 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Apr 2021 11:47:40 GMT",
"version": "v3"
}
] | 2021-05-12 | [
[
"Siddhant",
"Siddhant",
"",
"IIT Kharagpur,\n India"
],
[
"Chakraborty",
"Indranil",
"",
"IIT Kharagpur,\n India"
],
[
"Kar",
"Sayan",
"",
"IIT Kharagpur,\n India"
]
] | Memory effects are studied in the simplest scalar-tensor theory, the Brans--Dicke (BD) theory. To this end, we introduce, in BD theory, novel Kundt spacetimes (without and with gyratonic terms), which serve as backgrounds for the ensuing analysis on memory. The BD parameter $\omega$ and the scalar field ($\phi$) profil... |
1704.03536 | Yusuf Sucu | Ganim Gecim and Yusuf Sucu | The GUP effect on Hawking Radiation of the 2+1 dimensional Black Hole | 9 pages | Phys. Lett. B 773 (2017) 391-394 | 10.1016/j.physletb.2017.08.053 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Generalized Uncertainty Principle (GUP) effect on the
Hawking radiation of the 2+1 dimensional Martinez-Zanelli black hole by using
the Hamilton-Jacobi method. In this connection, we discuss the tunnelling
probabilities and Hawking temperature of the spin-1/2 and spin-0 particles for
the black hole... | [
{
"created": "Mon, 10 Apr 2017 15:29:27 GMT",
"version": "v1"
}
] | 2017-10-09 | [
[
"Gecim",
"Ganim",
""
],
[
"Sucu",
"Yusuf",
""
]
] | We investigate the Generalized Uncertainty Principle (GUP) effect on the Hawking radiation of the 2+1 dimensional Martinez-Zanelli black hole by using the Hamilton-Jacobi method. In this connection, we discuss the tunnelling probabilities and Hawking temperature of the spin-1/2 and spin-0 particles for the black hole. ... |
gr-qc/0207091 | Toporenskij A. V. | A.V. Toporensky, P.V. Tretyakov and V.O.Ustiansky | New properties of scalar field dynamics in brane isotropic cosmological
models | 13 pages with 2 eps figures, submitted to Astronomy Letters | Astron.Lett.29:1-5,2003 | 10.1134/1.1537370 | null | gr-qc | null | Several aspects of scalar field dynamics on a brane which differs from
corresponding regimes in the standard cosmology are investigated. We consider
asymptotic solution near a singularity, condition for inflation and bounces and
some detail of chaotic behavior in the brane model. Each results are compared
with those ... | [
{
"created": "Wed, 24 Jul 2002 12:04:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Toporensky",
"A. V.",
""
],
[
"Tretyakov",
"P. V.",
""
],
[
"Ustiansky",
"V. O.",
""
]
] | Several aspects of scalar field dynamics on a brane which differs from corresponding regimes in the standard cosmology are investigated. We consider asymptotic solution near a singularity, condition for inflation and bounces and some detail of chaotic behavior in the brane model. Each results are compared with those kn... |
0710.5692 | Sophie de Buyl | Thibault Damour and Sophie de Buyl | Describing general cosmological singularities in Iwasawa variables | 50 pages, 4 figures | Phys.Rev.D77:043520,2008 | 10.1103/PhysRevD.77.043520 | IHES/P/07/36 | gr-qc hep-th | null | Belinskii, Khalatnikov, and Lifshitz (BKL) conjectured that the description
of the asymptotic behavior of a generic solution of Einstein equations near a
spacelike singularity could be drastically simplified by considering that the
time derivatives of the metric asymptotically dominate (except at a sequence of
instan... | [
{
"created": "Tue, 30 Oct 2007 17:16:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Damour",
"Thibault",
""
],
[
"de Buyl",
"Sophie",
""
]
] | Belinskii, Khalatnikov, and Lifshitz (BKL) conjectured that the description of the asymptotic behavior of a generic solution of Einstein equations near a spacelike singularity could be drastically simplified by considering that the time derivatives of the metric asymptotically dominate (except at a sequence of instants... |
1802.05290 | Zhongmin Qian | Zhongmin Qian | Spacetime orientation and the meaning of Lorentz invariance in general
relativity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parity violation at the level of weak interactions and other similar
discrete symmetries breaking show that the invariance of laws under the full
group of Lorentz transformations can not be taken granted. We examine the
principle of Lorentz invariance under the general theory of relativity, and
demonstrate the im... | [
{
"created": "Wed, 14 Feb 2018 19:10:25 GMT",
"version": "v1"
}
] | 2018-02-16 | [
[
"Qian",
"Zhongmin",
""
]
] | The parity violation at the level of weak interactions and other similar discrete symmetries breaking show that the invariance of laws under the full group of Lorentz transformations can not be taken granted. We examine the principle of Lorentz invariance under the general theory of relativity, and demonstrate the impo... |
1501.06591 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou, Emmanuel N. Saridakis | Superbounce and Loop Quantum Ekpyrotic Cosmologies from Modified
Gravity: $F(R)$, $F(G)$ and $F(T)$ Theories | Revised version, to appear in AOP | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the realization of two bouncing paradigms, namely of the
superbounce and the loop quantum cosmological ekpyrosis, in the framework of
various modified gravities. In particular, we focus on the $F(R)$, $F(G)$ and
$F(T)$ gravities, and we reconstruct their specific subclasses which lead to
such universe ... | [
{
"created": "Mon, 26 Jan 2015 21:17:32 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Aug 2015 18:37:25 GMT",
"version": "v2"
}
] | 2015-08-25 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the realization of two bouncing paradigms, namely of the superbounce and the loop quantum cosmological ekpyrosis, in the framework of various modified gravities. In particular, we focus on the $F(R)$, $F(G)$ and $F(T)$ gravities, and we reconstruct their specific subclasses which lead to such universe ev... |
2005.13464 | Pedro Pina Avelino | P. P. Avelino | Reply to note on "Boltzmann's H-theorem, entropy and the strength of
gravity in theories with a nonminimal coupling between matter and geometry" | 2 pages, no figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this brief reply we respond to the note of Bertolami and Gomes
(arXiv:2005.03968) on our recent paper (arXiv:2003.10154).
| [
{
"created": "Wed, 27 May 2020 16:21:39 GMT",
"version": "v1"
}
] | 2020-05-28 | [
[
"Avelino",
"P. P.",
""
]
] | In this brief reply we respond to the note of Bertolami and Gomes (arXiv:2005.03968) on our recent paper (arXiv:2003.10154). |
gr-qc/0406070 | Jose A. Gonzalez | Miguel Alcubierre, Jose A. Gonzalez, Marcelo Salgado and Daniel
Sudarsky | On a debate about cosmic censor violation | 3 pages. We add a comment and a reference | null | null | null | gr-qc | null | We review the arguments and counter arguments about the recent proposal for
generic censorship violation. In particular the argument made in gr-qc/0405050
against our proposal for a possible expanding domain wall that could encompass
a large black hole, is shown to have a serious flaw. Other problems of the
original ... | [
{
"created": "Fri, 18 Jun 2004 02:42:54 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 2004 23:43:37 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Jun 2004 17:33:20 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Gonzalez",
"Jose A.",
""
],
[
"Salgado",
"Marcelo",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | We review the arguments and counter arguments about the recent proposal for generic censorship violation. In particular the argument made in gr-qc/0405050 against our proposal for a possible expanding domain wall that could encompass a large black hole, is shown to have a serious flaw. Other problems of the original id... |
2105.11785 | Rikpratik Sengupta | Rikpratik Sengupta, Shounak Ghosh, Mehedi Kalam, Saibal Ray | Wormhole on the Brane with Ordinary Matter: The Broader View | 27 Pages, 5 figures | Classical and Quantum Gravity, Vol 39, 2022 | 10.1088/1361-6382/ac61ae | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper we attempt to examine the possibility of construction of a
traversable wormhole on the Randall-Sundrum braneworld with ordinary matter
employing the Kuchowicz potential as one of the metric potentials. In this
scenario, the wormhole shape function is obtained and studied, along with
validity of Null Ene... | [
{
"created": "Tue, 25 May 2021 09:27:48 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2022 17:53:55 GMT",
"version": "v2"
}
] | 2022-03-31 | [
[
"Sengupta",
"Rikpratik",
""
],
[
"Ghosh",
"Shounak",
""
],
[
"Kalam",
"Mehedi",
""
],
[
"Ray",
"Saibal",
""
]
] | In this paper we attempt to examine the possibility of construction of a traversable wormhole on the Randall-Sundrum braneworld with ordinary matter employing the Kuchowicz potential as one of the metric potentials. In this scenario, the wormhole shape function is obtained and studied, along with validity of Null Energ... |
2405.04653 | Shu Yan Lau | Shu Yan Lau, Siddarth Ajith, Victor Guedes, Kent Yagi | Nonradial instabilities in anisotropic neutron stars | 7+7 pages, 2+1 figures, submitted to PRL | null | null | null | gr-qc astro-ph.HE hep-ph | http://creativecommons.org/licenses/by/4.0/ | Non-radial oscillation modes of a neutron star possess valuable information
about its internal structure and nuclear physics. Starting from the quadrupolar
order, such modes under general relativity are known as quasi-normal modes
since they dissipate energy through gravitational radiation and their
frequencies are c... | [
{
"created": "Tue, 7 May 2024 20:25:37 GMT",
"version": "v1"
}
] | 2024-05-09 | [
[
"Lau",
"Shu Yan",
""
],
[
"Ajith",
"Siddarth",
""
],
[
"Guedes",
"Victor",
""
],
[
"Yagi",
"Kent",
""
]
] | Non-radial oscillation modes of a neutron star possess valuable information about its internal structure and nuclear physics. Starting from the quadrupolar order, such modes under general relativity are known as quasi-normal modes since they dissipate energy through gravitational radiation and their frequencies are com... |
2006.08693 | Jorge Bellor\'in | Jorge Bellorin, Claudio Borquez and Byron Droguett | Curvature vs degrees of freedom: The case of the critical 2+1 Horava
theory | We have included the results of this paper in another work with a
different focusing | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the interesting case of the 2+1 nonprojectable Horava theory
formulated at the critical point, where it does not posses local degrees of
freedom. The critical point is defined by the value of a coupling constant of
the theory. We discuss how, in spite of the absence of degrees of freedom, the
theory admits... | [
{
"created": "Mon, 15 Jun 2020 19:04:55 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 2020 21:53:10 GMT",
"version": "v2"
}
] | 2020-09-01 | [
[
"Bellorin",
"Jorge",
""
],
[
"Borquez",
"Claudio",
""
],
[
"Droguett",
"Byron",
""
]
] | We present the interesting case of the 2+1 nonprojectable Horava theory formulated at the critical point, where it does not posses local degrees of freedom. The critical point is defined by the value of a coupling constant of the theory. We discuss how, in spite of the absence of degrees of freedom, the theory admits s... |
2105.08543 | Hao-Jui Kuan | Hao-Jui Kuan, Jasbir Singh, Daniela D. Doneva, Stoytcho S. Yazadjiev,
Kostas D. Kokkotas | Nonlinear evolution and non-uniqueness of scalarized neutron stars | 10 pages, 5 figures, 1 table | null | 10.1103/PhysRevD.104.124013 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was recently shown, that in a class of tensor-multi-scalar theories of
gravity with a nontrivial target space metric, there exist scalarized neutron
star solutions. An important property of these compact objects is that the
scalar charge is zero and therefore, the binary pulsar experiments can not
impose constrain... | [
{
"created": "Tue, 18 May 2021 14:22:50 GMT",
"version": "v1"
}
] | 2021-12-15 | [
[
"Kuan",
"Hao-Jui",
""
],
[
"Singh",
"Jasbir",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | It was recently shown, that in a class of tensor-multi-scalar theories of gravity with a nontrivial target space metric, there exist scalarized neutron star solutions. An important property of these compact objects is that the scalar charge is zero and therefore, the binary pulsar experiments can not impose constraints... |
gr-qc/0703134 | Michael Reisenberger | Michael P. Reisenberger | The symplectic 2-form and Poisson bracket of null canonical gravity | 132 pages, 4 figures | null | null | null | gr-qc | null | It is well known that free (unconstrained) initial data for the gravitational
field in general relativity can be identified on an initial hypersurface
consisting of two intersecting null hypersurfaces. Here the phase space of
vacuum general relativity associated with such an initial data hypersurface is
defined; a Po... | [
{
"created": "Tue, 27 Mar 2007 19:47:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Reisenberger",
"Michael P.",
""
]
] | It is well known that free (unconstrained) initial data for the gravitational field in general relativity can be identified on an initial hypersurface consisting of two intersecting null hypersurfaces. Here the phase space of vacuum general relativity associated with such an initial data hypersurface is defined; a Pois... |
0902.4767 | Kohkichi Konno | Kohkichi Konno, Toyoki Matsuyama, Satoshi Tanda | Rotating black hole in extended Chern-Simons modified gravity | 9 pages, 1 figure, to appear in Progress of Theoretical Physics,
typos corrected | Prog.Theor.Phys.122:561-568,2009 | 10.1143/PTP.122.561 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a slowly rotating black hole in four-dimensional extended
Chern-Simons modified gravity. We obtain an approximate solution that reduces
to the Kerr solution when a coupling constant vanishes. The Chern-Simons
correction effectively reduces the frame-dragging effect around a black hole in
comparison wit... | [
{
"created": "Fri, 27 Feb 2009 08:36:09 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2009 03:59:58 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jul 2009 04:44:09 GMT",
"version": "v3"
}
] | 2009-11-19 | [
[
"Konno",
"Kohkichi",
""
],
[
"Matsuyama",
"Toyoki",
""
],
[
"Tanda",
"Satoshi",
""
]
] | We investigate a slowly rotating black hole in four-dimensional extended Chern-Simons modified gravity. We obtain an approximate solution that reduces to the Kerr solution when a coupling constant vanishes. The Chern-Simons correction effectively reduces the frame-dragging effect around a black hole in comparison with ... |
gr-qc/0210044 | Ozay Gurtug | Ozay Gurtug and Izzet Sakalli | Cosmic Strings Coupled With a Massless Scalar Field | 14 pages, Introduction is revised. To be published in Int. Jour. of
Ther. Phys | Int.J.Theor.Phys. 42 (2003) 1875-1888 | null | null | gr-qc | null | A scalar field generalization of Xanthopoulos's cylindrically symmetric
solutions of the vacuum Einstein equation is obtained. The obtained solution
preserves the properties of the Xanthopoulos solution, which are regular on the
axis, asymptotically flat and free from the curvature singularities. The
solution describ... | [
{
"created": "Tue, 15 Oct 2002 06:46:40 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Jul 2003 07:43:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Gurtug",
"Ozay",
""
],
[
"Sakalli",
"Izzet",
""
]
] | A scalar field generalization of Xanthopoulos's cylindrically symmetric solutions of the vacuum Einstein equation is obtained. The obtained solution preserves the properties of the Xanthopoulos solution, which are regular on the axis, asymptotically flat and free from the curvature singularities. The solution describes... |
2101.10854 | \"Onder D\"unya | Onder Dunya, Levent Akant, Metin Arik, Yelda Kardas, Selale Sahin and
Tarik Tok | The Higgs Field and the Jordan Brans Dicke Cosmology | 18 pages | Eur. Phys. J. C 81, 66 (2021) | 10.1140/epjc/s10052-021-08880-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate a field theoretical approach to the Jordan-Brans- Dicke (JBD)
theory extended with a particular potential term on a cosmological background
by starting with the motivation that the Higgs field and the scale factor of
the universe are related. Based on this relation, it is possible to come up
with mathe... | [
{
"created": "Sun, 24 Jan 2021 10:25:32 GMT",
"version": "v1"
}
] | 2021-01-27 | [
[
"Dunya",
"Onder",
""
],
[
"Akant",
"Levent",
""
],
[
"Arik",
"Metin",
""
],
[
"Kardas",
"Yelda",
""
],
[
"Sahin",
"Selale",
""
],
[
"Tok",
"Tarik",
""
]
] | We investigate a field theoretical approach to the Jordan-Brans- Dicke (JBD) theory extended with a particular potential term on a cosmological background by starting with the motivation that the Higgs field and the scale factor of the universe are related. Based on this relation, it is possible to come up with mathema... |
1202.4888 | Simone Calogero | Simone Calogero | Cosmological models with fluid matter undergoing velocity diffusion | 11 Pages, 4 Figures. Version in press | null | 10.1016/j.geomphys.2012.06.004 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new type of fluid matter model in general relativity is introduced, in
which the fluid particles are subject to velocity diffusion without friction.
In order to compensate for the energy gained by the fluid particles due to
diffusion, a cosmological scalar field term is added to the left hand side of
the Einstein e... | [
{
"created": "Wed, 22 Feb 2012 11:45:50 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jun 2012 16:41:11 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Calogero",
"Simone",
""
]
] | A new type of fluid matter model in general relativity is introduced, in which the fluid particles are subject to velocity diffusion without friction. In order to compensate for the energy gained by the fluid particles due to diffusion, a cosmological scalar field term is added to the left hand side of the Einstein equ... |
2307.04405 | Jinhua Wang | Jinhua Wang and Wei Yuan | Global stability of the open Milne spacetime | More references are added | null | null | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The open Milne cosmological spacetime has a 3-dimensional Cauchy surface
isometric to the (non-compact) hyperbolic space. We prove the globally
nonlinear stability of the open Milne spacetime for both massive and massless
Einstein-scalar field equations and show that as time goes to infinity, the
spatial metric tends... | [
{
"created": "Mon, 10 Jul 2023 08:11:59 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2023 00:37:57 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Wang",
"Jinhua",
""
],
[
"Yuan",
"Wei",
""
]
] | The open Milne cosmological spacetime has a 3-dimensional Cauchy surface isometric to the (non-compact) hyperbolic space. We prove the globally nonlinear stability of the open Milne spacetime for both massive and massless Einstein-scalar field equations and show that as time goes to infinity, the spatial metric tends t... |
1210.4412 | Iver Brevik | I. Brevik, V. V. Obukhov, K. E. Osetrin, and A. V. Timoshkin | Little Rip cosmological models with time-dependent equation of state | 11 pages, latex, to appear in Mod. Phys. Lett. A. Abstract
reformulated | Modern Physics Letters A, Vol. 27, No. 36 (2012) 1250210 | 10.1142/S0217732312502100 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Specific dark energy models, leading to the Little Rip (LR) cosmology in the
far future, are investigated. Conditions for the occurrence of LR in terms of
the parameters present in the proposed equation of state for the dark energy
cosmic fluid are studied. Estimates about the time needed before the occurrence
of the... | [
{
"created": "Tue, 16 Oct 2012 13:55:47 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Oct 2012 15:05:15 GMT",
"version": "v2"
}
] | 2012-11-08 | [
[
"Brevik",
"I.",
""
],
[
"Obukhov",
"V. V.",
""
],
[
"Osetrin",
"K. E.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] | Specific dark energy models, leading to the Little Rip (LR) cosmology in the far future, are investigated. Conditions for the occurrence of LR in terms of the parameters present in the proposed equation of state for the dark energy cosmic fluid are studied. Estimates about the time needed before the occurrence of the r... |
gr-qc/0701135 | Alejandro Cabo | Owen Pavel Fernandez Piedra and Alejandro Cabo Montes de Oca | Quantization of massive scalar fields over axis symmetric space-time
backgrounds | 13 pages | null | null | null | gr-qc | null | The renormalized mean value of the quantum Lagrangian and the Energy-Momentum
tensor for scalar fields coupled to an arbitrary gravitational field
configuration are analytically evaluated in the Schwinger-DeWitt approximation,
up to second order in the inverse mass value. The cylindrical symmetry
situation is conside... | [
{
"created": "Wed, 24 Jan 2007 23:20:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Piedra",
"Owen Pavel Fernandez",
""
],
[
"de Oca",
"Alejandro Cabo Montes",
""
]
] | The renormalized mean value of the quantum Lagrangian and the Energy-Momentum tensor for scalar fields coupled to an arbitrary gravitational field configuration are analytically evaluated in the Schwinger-DeWitt approximation, up to second order in the inverse mass value. The cylindrical symmetry situation is considere... |
1412.3865 | Miko{\l}aj Korzy\'nski | Miko{\l}aj Korzy\'nski | Nonlinear effects of general relativity from multiscale structure | 30 pages, 10 figures | Class. Quantum Grav. 32 (2015) 215013 | 10.1088/0264-9381/32/21/215013 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When do the nonlinear effects of general relativity matter in astrophysical
situations? They are obviously relevant for very compact sources of the
gravitational field, such as neutron stars or black holes. In this paper I
discuss another, less obvious situation, in which large relativistic effects
may arise due to a... | [
{
"created": "Fri, 12 Dec 2014 01:00:40 GMT",
"version": "v1"
}
] | 2015-10-13 | [
[
"Korzyński",
"Mikołaj",
""
]
] | When do the nonlinear effects of general relativity matter in astrophysical situations? They are obviously relevant for very compact sources of the gravitational field, such as neutron stars or black holes. In this paper I discuss another, less obvious situation, in which large relativistic effects may arise due to a c... |
2205.14973 | Nikolaos Dimakis | N. Dimakis | Hidden symmetries from distortions of the conformal structure | 37 pages, 1 figure, Latex2e source file, minor changes to match
published version | Phys. Rev. D 106 (2022) 024043 | 10.1103/PhysRevD.106.024043 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well established that the mass parameter breaks the conformal
symmetries in the case of geodesic motion. The proper conformal Killing vectors
cease to generate conserved charges when non-null geodesics are considered. We
examine how the introduction of the mass is actually related to the appearance
of appropria... | [
{
"created": "Mon, 30 May 2022 10:21:48 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2022 02:57:29 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Jul 2022 03:36:36 GMT",
"version": "v3"
}
] | 2022-07-28 | [
[
"Dimakis",
"N.",
""
]
] | It is well established that the mass parameter breaks the conformal symmetries in the case of geodesic motion. The proper conformal Killing vectors cease to generate conserved charges when non-null geodesics are considered. We examine how the introduction of the mass is actually related to the appearance of appropriate... |
gr-qc/9601009 | Jorge Pullin | Richard H. Price, Jorge Pullin | Analytic approximations to the spacetime of a critical gravitational
collapse | 12 pages, Revtex, 9 figures included with epsf | Phys.Rev.D54:3792-3799,1996 | 10.1103/PhysRevD.54.3792 | CGPG-96/1-1 | gr-qc | null | We present analytic expressions that approximate the behavior of the
spacetime of a collapsing spherically symmetric scalar field in the critical
regime first discovered by Choptuik. We find that the critical region of
spacetime can usefully be divided into a ``quiescent'' region and an
``oscillatory'' region, and a ... | [
{
"created": "Tue, 9 Jan 1996 17:02:08 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Price",
"Richard H.",
""
],
[
"Pullin",
"Jorge",
""
]
] | We present analytic expressions that approximate the behavior of the spacetime of a collapsing spherically symmetric scalar field in the critical regime first discovered by Choptuik. We find that the critical region of spacetime can usefully be divided into a ``quiescent'' region and an ``oscillatory'' region, and a mo... |
gr-qc/9605073 | Roberto Longo | Roberto Longo (Universita' di Roma ``Tor Vergata'') | An Analogue of the Kac-Wakimoto Formula and Black Hole Conditional
Entropy | AMS-TeX v1.1c, minor grammatical corrections | Commun.Math.Phys.186:451-479,1997 | 10.1007/s002200050116 | null | gr-qc funct-an hep-th math.FA | null | A local formula for the dimension of a superselection sector in Quantum Field
Theory is obtained as vacuum expectation value of the exponential of the proper
Hamiltonian. In the particular case of a chiral conformal theory, this provides
a local analogue of a global formula obtained by Kac and Wakimoto within the
con... | [
{
"created": "Fri, 31 May 1996 14:57:15 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 1997 15:59:18 GMT",
"version": "v2"
}
] | 2011-04-06 | [
[
"Longo",
"Roberto",
"",
"Universita' di Roma ``Tor Vergata''"
]
] | A local formula for the dimension of a superselection sector in Quantum Field Theory is obtained as vacuum expectation value of the exponential of the proper Hamiltonian. In the particular case of a chiral conformal theory, this provides a local analogue of a global formula obtained by Kac and Wakimoto within the conte... |
1710.00919 | Hector O. Silva | Hector O. Silva, Nicolas Yunes | I-Love-Q to the extreme | 18 pages, 7 figures | null | 10.1088/1361-6382/aa995a | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Certain bulk properties of neutron stars, in particular their moment of
inertia, rotational quadrupole moment and tidal Love number, when properly
normalized, are related to one another in a nearly equation of state
independent way. The goal of this paper is to test these relations with extreme
equations of state at ... | [
{
"created": "Mon, 2 Oct 2017 21:33:48 GMT",
"version": "v1"
}
] | 2017-12-20 | [
[
"Silva",
"Hector O.",
""
],
[
"Yunes",
"Nicolas",
""
]
] | Certain bulk properties of neutron stars, in particular their moment of inertia, rotational quadrupole moment and tidal Love number, when properly normalized, are related to one another in a nearly equation of state independent way. The goal of this paper is to test these relations with extreme equations of state at su... |
2109.01640 | Roman Konoplya | R. A. Konoplya | Black holes in galactic centers: quasinormal ringing, grey-body factors
and Unruh temperature | 7 pages, revtex, the version accepted for publication in Physics
Letters B | Physics Letters B 823 (2021) 136734 | 10.1016/j.physletb.2021.136734 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Recently, Cardoso et al. [arXiv:2109.00005] found an exact solution
describing the black hole immersed in a galactic-like distribution of matter.
There, the properties of gravitational radiation were studied. Here we continue
analysis of properties of this geometry via consideration of the
electromagnetic radiation. ... | [
{
"created": "Fri, 3 Sep 2021 17:36:35 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Sep 2021 21:24:21 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Oct 2021 11:24:27 GMT",
"version": "v3"
}
] | 2021-10-26 | [
[
"Konoplya",
"R. A.",
""
]
] | Recently, Cardoso et al. [arXiv:2109.00005] found an exact solution describing the black hole immersed in a galactic-like distribution of matter. There, the properties of gravitational radiation were studied. Here we continue analysis of properties of this geometry via consideration of the electromagnetic radiation. We... |
2304.08348 | Haximjan Abdusattar | Haximjan Abdusattar | Insight into the Microstructure of FRW Universe from a $P$-$V$ Phase
Transition | 9 pages,3 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $P$-$V$ phase transition of the FRW (Friedmann-Robertson-Walker) universe
with a perfect fluid has recently been investigated, revealing that the four
critical exponents near the critical point are consistent with the values
predicted by mean field theory. Notably, the coexistence phase of the $P$-$V$
phase trans... | [
{
"created": "Mon, 17 Apr 2023 15:10:12 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 2023 11:27:41 GMT",
"version": "v2"
}
] | 2023-09-20 | [
[
"Abdusattar",
"Haximjan",
""
]
] | The $P$-$V$ phase transition of the FRW (Friedmann-Robertson-Walker) universe with a perfect fluid has recently been investigated, revealing that the four critical exponents near the critical point are consistent with the values predicted by mean field theory. Notably, the coexistence phase of the $P$-$V$ phase transit... |
gr-qc/0512037 | Bahtiyar Ozgur Sarioglu | Reinaldo J. Gleiser, Metin Gurses, Atalay Karasu, Ozgur Sarioglu | Closed timelike curves and geodesics of Godel-type metrics | REVTeX 4, 12 pages, no figures; the Introduction has been rewritten,
some minor mistakes corrected, many references added | Class.Quant.Grav. 23 (2006) 2653-2664 | 10.1088/0264-9381/23/7/025 | null | gr-qc hep-th | null | It is shown explicitly that when the characteristic vector field that defines
a Godel-type metric is also a Killing vector, there always exist closed
timelike or null curves in spacetimes described by such a metric. For these
geometries, the geodesic curves are also shown to be characterized by a lower
dimensional Lo... | [
{
"created": "Tue, 6 Dec 2005 07:40:07 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Jan 2006 13:17:13 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Gleiser",
"Reinaldo J.",
""
],
[
"Gurses",
"Metin",
""
],
[
"Karasu",
"Atalay",
""
],
[
"Sarioglu",
"Ozgur",
""
]
] | It is shown explicitly that when the characteristic vector field that defines a Godel-type metric is also a Killing vector, there always exist closed timelike or null curves in spacetimes described by such a metric. For these geometries, the geodesic curves are also shown to be characterized by a lower dimensional Lore... |
gr-qc/0301053 | Salvatore Capozziello | Salvatore Capozziello and Gaetano Lambiase | Newtonian limit of String-Dilaton Gravity | 11 pages, LATEX file, to appear in IJMPD | Int.J.Mod.Phys. D12 (2003) 843-852 | 10.1142/S0218271803003347 | null | gr-qc | null | We study the weak-field limit of string-dilaton gravity and derive
corrections to the Newtonian potential which strength directly depends on the
self interaction potential and the nonminimal coupling of the dilaton scalar
field. We discuss also possible astrophysical applications of the results, in
particular the fla... | [
{
"created": "Wed, 15 Jan 2003 17:06:07 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Lambiase",
"Gaetano",
""
]
] | We study the weak-field limit of string-dilaton gravity and derive corrections to the Newtonian potential which strength directly depends on the self interaction potential and the nonminimal coupling of the dilaton scalar field. We discuss also possible astrophysical applications of the results, in particular the flat ... |
1710.01722 | Jonathan Luk | Mihalis Dafermos and Jonathan Luk | The interior of dynamical vacuum black holes I: The $C^0$-stability of
the Kerr Cauchy horizon | null | null | null | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We initiate a series of works where we study the interior of dynamical
rotating vacuum black holes without symmetry. In the present paper, we take up
the problem starting from appropriate Cauchy data for the Einstein vacuum
equations defined on a hypersurface already within the black hole interior,
representing the e... | [
{
"created": "Wed, 4 Oct 2017 17:54:05 GMT",
"version": "v1"
}
] | 2017-10-05 | [
[
"Dafermos",
"Mihalis",
""
],
[
"Luk",
"Jonathan",
""
]
] | We initiate a series of works where we study the interior of dynamical rotating vacuum black holes without symmetry. In the present paper, we take up the problem starting from appropriate Cauchy data for the Einstein vacuum equations defined on a hypersurface already within the black hole interior, representing the exp... |
gr-qc/9912017 | Carlos Lousto | C. O. Lousto (AEI-Golm) | Pragmatic approach to gravitational radiation reaction in binary black
holes | 5 pages, 2 figures, improved text and figures. To appear in PRL | Phys.Rev.Lett. 84 (2000) 5251-5254 | 10.1103/PhysRevLett.84.5251 | AEI-1999-25 | gr-qc | null | We study the relativistic orbit of binary black holes in systems with small
mass ratio. The trajectory of the smaller object (another black hole or a
neutron star), represented as a particle, is determined by the geodesic
equation on the perturbed massive black hole spacetime. The particle itself
generates the gravit... | [
{
"created": "Fri, 3 Dec 1999 16:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2000 18:32:50 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Lousto",
"C. O.",
"",
"AEI-Golm"
]
] | We study the relativistic orbit of binary black holes in systems with small mass ratio. The trajectory of the smaller object (another black hole or a neutron star), represented as a particle, is determined by the geodesic equation on the perturbed massive black hole spacetime. The particle itself generates the gravitat... |
1606.01830 | Chun-Yen Lin | Jerzy Lewandowski, Chun-Yen Lin | Exploring the Tomlin-Varadarajan quantum constraints in $U(1)^3$ loop
quantum gravity: solutions and the Minkowski theorem | 17 pages, this version with improved descriptions and clarifications | Phys. Rev. D 95, 064032 (2017) | 10.1103/PhysRevD.95.064032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explicitly solved the anomaly-free quantum constraints proposed by Tomlin
and Varadarajan for the weak Euclidean model of canonical loop quantum gravity,
in a large subspace of the model's kinematic Hilbert space which is the space
of the charge network states. In doing so, we first identified the subspace on
whic... | [
{
"created": "Mon, 6 Jun 2016 17:09:40 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2016 14:54:18 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Feb 2017 14:57:39 GMT",
"version": "v3"
}
] | 2018-07-24 | [
[
"Lewandowski",
"Jerzy",
""
],
[
"Lin",
"Chun-Yen",
""
]
] | We explicitly solved the anomaly-free quantum constraints proposed by Tomlin and Varadarajan for the weak Euclidean model of canonical loop quantum gravity, in a large subspace of the model's kinematic Hilbert space which is the space of the charge network states. In doing so, we first identified the subspace on which ... |
2306.16743 | Simone D'Onofrio Dr. | Simone D'Onofrio | Holographic description of $F(R)$ gravity coupled with Axion Dark Matter | "International Journal of Geometric Methods in Modern Physics"
Accepted | null | 10.1142/S0219887823502249 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this work we study the autonomous dynamical system of different $F(R)$
models in the formalism of holographic dark energy using the generalized
Nojiri-Odintsov cut-off. We explicitly give the expression of the fixed points
as functions of the infrared cut-off for vacuum $F(R)$ gravity in flat and
non-flat FRW back... | [
{
"created": "Thu, 29 Jun 2023 07:34:55 GMT",
"version": "v1"
}
] | 2023-09-18 | [
[
"D'Onofrio",
"Simone",
""
]
] | In this work we study the autonomous dynamical system of different $F(R)$ models in the formalism of holographic dark energy using the generalized Nojiri-Odintsov cut-off. We explicitly give the expression of the fixed points as functions of the infrared cut-off for vacuum $F(R)$ gravity in flat and non-flat FRW backgr... |
1707.09702 | Yasusada Nambu | Marcello Rotondo and Yasusada Nambu | Quantum Cramer-Rao bound for a Massless Scalar Field in de Sitter Space | 16 pages, published version | Universe 2017,3,71 | 10.3390/universe3040071 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | How precisely can we estimate cosmological parameters by performing a quantum
measurement on a cosmological quantum state? In quantum estimation theory the
variance of an unbiased parameter estimator is bounded from below by the
inverse of measurement-dependent Fisher information and ultimately by quantum
Fisher info... | [
{
"created": "Mon, 31 Jul 2017 02:55:36 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2017 02:00:16 GMT",
"version": "v2"
}
] | 2017-10-17 | [
[
"Rotondo",
"Marcello",
""
],
[
"Nambu",
"Yasusada",
""
]
] | How precisely can we estimate cosmological parameters by performing a quantum measurement on a cosmological quantum state? In quantum estimation theory the variance of an unbiased parameter estimator is bounded from below by the inverse of measurement-dependent Fisher information and ultimately by quantum Fisher inform... |
gr-qc/0701079 | Francesco Cianfrani dr | Francesco Cianfrani, Giovanni Montani | The Electro-Weak model as low-energy sector of 8-dimensional General
Relativity | 5 pages, to appear in the Proceedings of the 1st Stueckelberg
Workshop | Nuovo Cim.B122:213-218,2007 | 10.1393/ncb/i2007-10356-0 | null | gr-qc | null | In a Kaluza-Klein background $V^4\otimes S^3$, we provide a way to reproduce,
by the dimensional reduction, a 4-spinor with a SU(2) gauge coupling. Since
additional gauge violating terms cannot be avoided, we compute their order of
magnitude by virtue of the application to the Electro-Weak model.
| [
{
"created": "Mon, 15 Jan 2007 14:16:30 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Cianfrani",
"Francesco",
""
],
[
"Montani",
"Giovanni",
""
]
] | In a Kaluza-Klein background $V^4\otimes S^3$, we provide a way to reproduce, by the dimensional reduction, a 4-spinor with a SU(2) gauge coupling. Since additional gauge violating terms cannot be avoided, we compute their order of magnitude by virtue of the application to the Electro-Weak model. |
2205.00575 | Rafael Hern\'andez-Jim\'enez | Clara Rojas, Rafael Hern\'andez-Jim\'enez | Inflation from a chaotic potential with a step | 21 pages, 16 figures | Phys. Dark Univ. 40 (2023) 101188 | 10.1016/j.dark.2023.101188 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the effects on the relevant observational parameters
of an inflationary universe from a chaotic potential with a step. We
numerically evolve the perturbation equations within both cold inflation and
warm inflation. On the one hand, in a cold inflation scenario we analyse the
scalar power spectr... | [
{
"created": "Sun, 1 May 2022 22:50:23 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2022 19:21:19 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Mar 2023 16:56:23 GMT",
"version": "v3"
}
] | 2023-03-09 | [
[
"Rojas",
"Clara",
""
],
[
"Hernández-Jiménez",
"Rafael",
""
]
] | In this work, we study the effects on the relevant observational parameters of an inflationary universe from a chaotic potential with a step. We numerically evolve the perturbation equations within both cold inflation and warm inflation. On the one hand, in a cold inflation scenario we analyse the scalar power spectrum... |
1712.09534 | Alexey Golovnev | Alexey Golovnev, Fedor Smirnov | Algebraic aspects of massive gravity | 9 pages, 1 figure; some typos corrected | International Journal of Geometric Methods in Modern Physics 15
(2018) 1840003 | 10.1142/S0219887818400030 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the freedom of choosing a square root in massive gravity from
algebraic point of view. This contribution is based on the talk given by one of
us (AG) at the Geometric Foundations of Gravity conference in Tartu in August
2017.
| [
{
"created": "Wed, 27 Dec 2017 09:50:27 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jan 2018 06:43:57 GMT",
"version": "v2"
}
] | 2018-05-08 | [
[
"Golovnev",
"Alexey",
""
],
[
"Smirnov",
"Fedor",
""
]
] | We describe the freedom of choosing a square root in massive gravity from algebraic point of view. This contribution is based on the talk given by one of us (AG) at the Geometric Foundations of Gravity conference in Tartu in August 2017. |
2004.10795 | Victor I. Afonso | Victor I. Afonso | Compact scalar field solutions in EiBI gravity | 27 onecolumn pages, 4 figures, Contribution to Selected Papers of the
Fifth Amazonian Symposium on Physics, Accepted in IJMPD | null | 10.1142/S0218271820410114 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss exact scalar field solutions describing gravitating compact
objects in the Eddington-inspired Born-Infeld gravity (EiBI), a member of the
class of (metric-affine formulated) Ricci-based gravity theories (RBGs). We
include a detailed account of the RBGs/GR correspondence exploited to
analytically solve the ... | [
{
"created": "Wed, 22 Apr 2020 19:01:38 GMT",
"version": "v1"
}
] | 2020-07-21 | [
[
"Afonso",
"Victor I.",
""
]
] | We discuss exact scalar field solutions describing gravitating compact objects in the Eddington-inspired Born-Infeld gravity (EiBI), a member of the class of (metric-affine formulated) Ricci-based gravity theories (RBGs). We include a detailed account of the RBGs/GR correspondence exploited to analytically solve the fi... |
2008.13744 | Pedro Pessoa | Pedro Pessoa, Bruno Arderucio Costa | Comment on "Black Hole Entropy: A Closer Look" | null | Entropy 2020, 22(10), 1110 | 10.3390/e22101110 | null | gr-qc cond-mat.stat-mech physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper [Entropy 2020, 22(1), 17] C. Tsallis states that entropy --
as in Shannon's or Kullback-Leiber's definitions -- is inadequate to interpret
black hole entropy and suggests that a new non-additive functional should take
the role of entropy. Here we counter argue by explaining the important
distinction... | [
{
"created": "Mon, 31 Aug 2020 17:08:15 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Sep 2020 20:21:45 GMT",
"version": "v2"
}
] | 2021-03-23 | [
[
"Pessoa",
"Pedro",
""
],
[
"Costa",
"Bruno Arderucio",
""
]
] | In a recent paper [Entropy 2020, 22(1), 17] C. Tsallis states that entropy -- as in Shannon's or Kullback-Leiber's definitions -- is inadequate to interpret black hole entropy and suggests that a new non-additive functional should take the role of entropy. Here we counter argue by explaining the important distinction b... |
gr-qc/0002009 | Eric Chassande-Mottin | E. Chassande-Mottin (1) and S. Dhurandhar (1 and 2) ((1)
Albert-Einstein-Institut, (2) IUCAA) | Adaptive filtering techniques for interferometric data preparation:
removal of long-term sinusoidal signals and oscillatory transients | 4 pages, 2 figures. Proceedings of GWDAW99 (Roma, Dec. 1999), to
appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D9 (2000) 275-279 | 10.1142/S021827180000027X | AEI-2000-010 | gr-qc | null | We propose an adaptive denoising scheme for poorly modeled non-Gaussian
features in the gravitational wave interferometric data. Preliminary tests on
real data show encouraging results.
| [
{
"created": "Wed, 2 Feb 2000 16:51:47 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chassande-Mottin",
"E.",
"",
"1 and 2"
],
[
"Dhurandhar",
"S.",
"",
"1 and 2"
]
] | We propose an adaptive denoising scheme for poorly modeled non-Gaussian features in the gravitational wave interferometric data. Preliminary tests on real data show encouraging results. |
2209.08202 | Zhaoyi Xu | Meirong Tang and Zhaoyi Xu | The no-hair theorem and black hole shadows | 19 pages, 11 figures | null | 10.1007/JHEP12(2022)125 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The successful observation of M87 supermassive black hole by the Black Hole
Event Horizon Telescope(EHT) provides a very good opportunity to study the
theory of gravity. In this work, we obtain the exact solution for the short
hair black hole (BH) in the rotation situation, and calculate in detail how
hairs affect th... | [
{
"created": "Sat, 17 Sep 2022 00:25:46 GMT",
"version": "v1"
}
] | 2023-01-04 | [
[
"Tang",
"Meirong",
""
],
[
"Xu",
"Zhaoyi",
""
]
] | The successful observation of M87 supermassive black hole by the Black Hole Event Horizon Telescope(EHT) provides a very good opportunity to study the theory of gravity. In this work, we obtain the exact solution for the short hair black hole (BH) in the rotation situation, and calculate in detail how hairs affect the ... |
gr-qc/0306076 | Thomas B. Bahder | Thomas B. Bahder | Relativity of GPS Measurement | 18 pages, 5 figures, ReVTeX4 | Phys.Rev. D68 (2003) 063005 | 10.1103/PhysRevD.68.063005 | null | gr-qc | null | The relativity of Global Positioning System (GPS) pseudorange measurements is
explored within the geometrical optics approximation in the curved space-time
near Earth. A space-time grid for navigation is created by the discontinuities
introduced in the electromagnetic field amplitude by the P-code broadcast by
the GP... | [
{
"created": "Tue, 17 Jun 2003 04:29:46 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 2003 19:12:28 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bahder",
"Thomas B.",
""
]
] | The relativity of Global Positioning System (GPS) pseudorange measurements is explored within the geometrical optics approximation in the curved space-time near Earth. A space-time grid for navigation is created by the discontinuities introduced in the electromagnetic field amplitude by the P-code broadcast by the GPS ... |
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