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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1903.04775 | Shibendu Gupta Choudhury | Shibendu Gupta Choudhury, Ananda Dasgupta, Narayan Banerjee | Reconstruction of $f(R)$ gravity models for an accelerated universe
using Raychaudhuri equation | 8 pages, 7 figures, to appear in MNRAS | Monthly Notices of the Royal Astronomical Society, Volume 485,
Issue 4, June 2019, Page 5693 | 10.1093/mnras/stz731 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new strategy for the reconstruction of $f(R)$ gravity models have been
attempted using Raychaudhuri equation. Two examples, one for an eternally
accelerating universe and the other for one that mimics a ${\Lambda}$CDM
expansion history have been worked out. For both the cases, the relevant
$f=f(R)$ could be found o... | [
{
"created": "Tue, 12 Mar 2019 08:24:46 GMT",
"version": "v1"
}
] | 2019-04-09 | [
[
"Choudhury",
"Shibendu Gupta",
""
],
[
"Dasgupta",
"Ananda",
""
],
[
"Banerjee",
"Narayan",
""
]
] | A new strategy for the reconstruction of $f(R)$ gravity models have been attempted using Raychaudhuri equation. Two examples, one for an eternally accelerating universe and the other for one that mimics a ${\Lambda}$CDM expansion history have been worked out. For both the cases, the relevant $f=f(R)$ could be found out... |
1505.00998 | Sergio Zerbini | Yevgeniya Rabochaya and Sergio Zerbini | Quantum detectors in generic non flat FLRW space-times | !6 pages | null | 10.1007/s10773-015-2902-x | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quantum field theoretical approach, in which a quantum probe is used to
investigate the properties generic non-flat FLRW space-times is discussed. The
probe is identified with a conformally coupled massless scalar field defined on
a space-time with horizon and the procedure to investigate the local properties
is re... | [
{
"created": "Tue, 5 May 2015 13:15:01 GMT",
"version": "v1"
}
] | 2016-01-27 | [
[
"Rabochaya",
"Yevgeniya",
""
],
[
"Zerbini",
"Sergio",
""
]
] | A quantum field theoretical approach, in which a quantum probe is used to investigate the properties generic non-flat FLRW space-times is discussed. The probe is identified with a conformally coupled massless scalar field defined on a space-time with horizon and the procedure to investigate the local properties is real... |
1709.05659 | Wei-Tou Ni | Wei-Tou Ni | Gravitational Wave (GW) Classification, Space GW Detection Sensitivities
and AMIGO (Astrodynamical Middle-frequency Interferometric GW Observatory) | 10 pages, 2 figures, 1 table, Plenary talk given in Joint Meeting of
13th International Conference on Gravitation, Astrophysics, and Cosmology and
15th Italian-Korean Symposium on Relativistic Astrophysics, Ewha Womans
University, Seoul, Korea, July 3-7, 2017 | null | 10.1051/epjconf/201816801004 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After first reviewing the gravitational wave (GW) spectral classification. we
discuss the sensitivities of GW detection in space aimed at low frequency band
(100 nHz-100 mHz) and middle frequency band (100 mHz-10 Hz). The science goals
are to detect GWs from (i) Supermassive Black Holes; (ii) Extreme-Mass-Ratio
Black... | [
{
"created": "Sun, 17 Sep 2017 13:16:31 GMT",
"version": "v1"
}
] | 2018-01-24 | [
[
"Ni",
"Wei-Tou",
""
]
] | After first reviewing the gravitational wave (GW) spectral classification. we discuss the sensitivities of GW detection in space aimed at low frequency band (100 nHz-100 mHz) and middle frequency band (100 mHz-10 Hz). The science goals are to detect GWs from (i) Supermassive Black Holes; (ii) Extreme-Mass-Ratio Black H... |
1312.4347 | Jozef Skakala | Jozef Skakala (IISER-TVM), S. Shankaranarayanan (IISER-TVM) | Black hole hair in Lovelock gravity | 6 pages, v3: the final version accepted for publication in Phys.Rev.D | Phys. Rev. D 89, 104003 (2014) | 10.1103/PhysRevD.89.104003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a method to analyse black hole hair in the spherical symmetric
sector of the Lovelock theory in arbitrary dimensions that is an alternative to
solving the equations of motion in their complete form. We explicitly show that
the method matches with the known black hole solutions for the vacuum and
electro-va... | [
{
"created": "Mon, 16 Dec 2013 13:24:29 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Dec 2013 14:49:41 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Apr 2014 04:12:14 GMT",
"version": "v3"
}
] | 2014-05-07 | [
[
"Skakala",
"Jozef",
"",
"IISER-TVM"
],
[
"Shankaranarayanan",
"S.",
"",
"IISER-TVM"
]
] | We present a method to analyse black hole hair in the spherical symmetric sector of the Lovelock theory in arbitrary dimensions that is an alternative to solving the equations of motion in their complete form. We explicitly show that the method matches with the known black hole solutions for the vacuum and electro-vacu... |
gr-qc/9404030 | Charles Torre | I. M. Anderson and C. G. Torre | Classification of Generalized Symmetries for the Vacuum Einstein
Equations | 57 pages, plain TeX | Commun.Math.Phys.176:479-539,1996 | 10.1007/BF02099248 | null | gr-qc | null | A generalized symmetry of a system of differential equations is an
infinitesimal transformation depending locally upon the fields and their
derivatives which carries solutions to solutions. We classify all generalized
symmetries of the vacuum Einstein equations in four spacetime dimensions. To
begin, we analyze symme... | [
{
"created": "Thu, 14 Apr 1994 17:44:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Anderson",
"I. M.",
""
],
[
"Torre",
"C. G.",
""
]
] | A generalized symmetry of a system of differential equations is an infinitesimal transformation depending locally upon the fields and their derivatives which carries solutions to solutions. We classify all generalized symmetries of the vacuum Einstein equations in four spacetime dimensions. To begin, we analyze symmetr... |
2304.06210 | Lior M. Burko | Lior M. Burko, Gaurav Khanna, Subir Sabharwal | Aretakis Hair for Extreme Kerr Black Holes with Axisymmetric Scalar
Perturbations | 8 pages, 7 figures, 5 tables | null | 10.1103/PhysRevD.107.124023 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the evolution of axially-symmetric scalar field perturbations on an
extreme Kerr spacetime for initial data with multipole moments $\ell^{\prime}$
higher than the least radiative mode, and we measure modes $\ell$ -- and for
the first time also horizon charges -- that are excited by mode coupling
interactions... | [
{
"created": "Thu, 13 Apr 2023 01:28:39 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Burko",
"Lior M.",
""
],
[
"Khanna",
"Gaurav",
""
],
[
"Sabharwal",
"Subir",
""
]
] | We study the evolution of axially-symmetric scalar field perturbations on an extreme Kerr spacetime for initial data with multipole moments $\ell^{\prime}$ higher than the least radiative mode, and we measure modes $\ell$ -- and for the first time also horizon charges -- that are excited by mode coupling interactions. ... |
1809.02480 | Jiri Podolsky | Jiri Podolsky, Robert Svarc, Hideki Maeda | All solutions of Einstein's equations in 2+1 dimensions:
$\Lambda$-vacuum, pure radiation, or gyratons | 27 pages, 1 figure. Accepted to Class. Quantum Gravity | Class. Quantum Grav. 36 (2019) 015009 | 10.1088/1361-6382/aaef51 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under a weak assumption of the existence of a geodesic null congruence, we
present the general solution of the Einstein field equations in three
dimensions with any value of the cosmological constant, admitting an aligned
null matter field, and also gyratons (a matter field in the form of a null dust
with an addition... | [
{
"created": "Fri, 7 Sep 2018 13:56:52 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2018 14:44:15 GMT",
"version": "v2"
}
] | 2021-08-09 | [
[
"Podolsky",
"Jiri",
""
],
[
"Svarc",
"Robert",
""
],
[
"Maeda",
"Hideki",
""
]
] | Under a weak assumption of the existence of a geodesic null congruence, we present the general solution of the Einstein field equations in three dimensions with any value of the cosmological constant, admitting an aligned null matter field, and also gyratons (a matter field in the form of a null dust with an additional... |
2209.07549 | V\'ictor Jaramillo | V\'ictor Jaramillo, Dar\'io N\'u\~nez | Magnetostatic boson stars | 13 pages, minor improvements, matches with PRD version | null | 10.1103/PhysRevD.106.104023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We solve the Einstein-Maxwell-Klein-Gordon system of equations and derive a
compact, static axially symmetric magnetized object which is electrically
neutral and made of two complex massive charged scalar fields. We describe
several properties of such solution, including the torus form of the matter
density and the e... | [
{
"created": "Thu, 15 Sep 2022 18:07:41 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2022 22:23:31 GMT",
"version": "v2"
}
] | 2022-11-23 | [
[
"Jaramillo",
"Víctor",
""
],
[
"Núñez",
"Darío",
""
]
] | We solve the Einstein-Maxwell-Klein-Gordon system of equations and derive a compact, static axially symmetric magnetized object which is electrically neutral and made of two complex massive charged scalar fields. We describe several properties of such solution, including the torus form of the matter density and the exp... |
2009.09733 | James Read | Neil Dewar and James Read | Conformal Invariance of the Newtonian Weyl Tensor | 10 pages, forthcoming in Foundations of Physics | null | 10.1007/s10701-020-00386-w | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that the conformal structure of a relativistic spacetime is
of profound physical and conceptual interest. In this note, we consider the
analogous structure for Newtonian theories. We show that the Newtonian Weyl
tensor is an invariant of this structure.
| [
{
"created": "Mon, 21 Sep 2020 10:07:20 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Dewar",
"Neil",
""
],
[
"Read",
"James",
""
]
] | It is well-known that the conformal structure of a relativistic spacetime is of profound physical and conceptual interest. In this note, we consider the analogous structure for Newtonian theories. We show that the Newtonian Weyl tensor is an invariant of this structure. |
1909.00904 | R. R. Cuzinatto | R. R. Cuzinatto, M. de Montigny, P. J. Pompeia | Non-commutativity and non-inertial effects on the Dirac oscillator in a
cosmic string space-time | 23 pages | General Relativity and Gravitation (2019) 51:107 | 10.1007/s10714-019-2593-3 | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the non-inertial effects of a rotating frame on a Dirac oscillator
in a cosmic string space-time with non-commutative geometry in phase space. We
observe that the approximate bound-state solutions are related to the
biconfluent Heun polynomials. The related energies cannot be obtained in a
closed form for ... | [
{
"created": "Tue, 3 Sep 2019 00:53:07 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Cuzinatto",
"R. R.",
""
],
[
"de Montigny",
"M.",
""
],
[
"Pompeia",
"P. J.",
""
]
] | We examine the non-inertial effects of a rotating frame on a Dirac oscillator in a cosmic string space-time with non-commutative geometry in phase space. We observe that the approximate bound-state solutions are related to the biconfluent Heun polynomials. The related energies cannot be obtained in a closed form for al... |
1111.5336 | Ugur Camci | Y. Kucukakca and U. Camci | Noether gauge symmetry for $f(R)$ gravity in Palatini formalism | 7 pagese, no figures; Published in Astrophysics & Space Science. Some
minor corrections have been made | Astrophys.Space Sci.338 (2012) 211-216 | 10.1007/s10509-011-0921-5 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we consider a flat Friedmann-Robertson-Walker (FRW) universe
in the context of Palatini $f(R)$ theory of gravity. Using the dynamical
equivalence between $f(R)$ gravity and scalar-tensor theories, we construct a
point Lagrangian in the flat FRW spacetime. Applying {\em Noether gauge
symmetry approach} ... | [
{
"created": "Tue, 22 Nov 2011 21:02:11 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2012 09:49:48 GMT",
"version": "v2"
}
] | 2012-02-02 | [
[
"Kucukakca",
"Y.",
""
],
[
"Camci",
"U.",
""
]
] | In this study, we consider a flat Friedmann-Robertson-Walker (FRW) universe in the context of Palatini $f(R)$ theory of gravity. Using the dynamical equivalence between $f(R)$ gravity and scalar-tensor theories, we construct a point Lagrangian in the flat FRW spacetime. Applying {\em Noether gauge symmetry approach} fo... |
gr-qc/0505145 | Chris Clarkson | Chris Clarkson and Sanjeev S. Seahra (ICG, Portsmouth) | Braneworld resonances | 22 pages, 18 figures | Class.Quant.Grav. 22 (2005) 3653-3688 | 10.1088/0264-9381/22/17/020 | null | gr-qc hep-th | null | We investigate in detail gravitational waves in an Schwarzschild-anti-de
Sitter bulk spacetime surrounded by an Einstein static brane with generic
matter content. Such a model provides a useful analogy to braneworld cosmology
at various stages of its evolution, and generalizes our previous work
[gr-qc/0504023] on pur... | [
{
"created": "Sun, 29 May 2005 15:13:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Clarkson",
"Chris",
"",
"ICG, Portsmouth"
],
[
"Seahra",
"Sanjeev S.",
"",
"ICG, Portsmouth"
]
] | We investigate in detail gravitational waves in an Schwarzschild-anti-de Sitter bulk spacetime surrounded by an Einstein static brane with generic matter content. Such a model provides a useful analogy to braneworld cosmology at various stages of its evolution, and generalizes our previous work [gr-qc/0504023] on pure ... |
0809.1528 | Muhammad Sharif | M. Sharif and Nousheen Ilyas | Matter Collineations of Plane Symmetric Spacetimes | 17 pages, accepted for publication in Chinese J. Physics | Chinese J. Physics 46(2008)621-635 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to the study of matter collineations of plane symmetric
spacetimes (for a particular class of spacetimes) when the energy-momentum
tensor is non-degenerate. There exists many interesting cases where we obtain
proper matter collineations. The matter collineations in these cases are {\it
four}, \e... | [
{
"created": "Tue, 9 Sep 2008 10:22:24 GMT",
"version": "v1"
}
] | 2009-02-27 | [
[
"Sharif",
"M.",
""
],
[
"Ilyas",
"Nousheen",
""
]
] | This paper is devoted to the study of matter collineations of plane symmetric spacetimes (for a particular class of spacetimes) when the energy-momentum tensor is non-degenerate. There exists many interesting cases where we obtain proper matter collineations. The matter collineations in these cases are {\it four}, \emp... |
gr-qc/0308035 | Hayoung Lee | Hayoung Lee | Asymptotic behaviour of the Einstein-Vlasov system with a positive
cosmological constant | 17 pages | Math.Proc.Cambridge Phil.Soc. 137 (2004) 495-509 | 10.1017/S0305004104007960 | AEI 2003-066 | gr-qc math-ph math.AP math.MP | null | We study locally spatially homogeneous solutions of the Einstein-Vlasov
system with a positive cosmological constant. First the global existence of
solutions of this system and the casual geodesic completeness are shown. Then
the asymptotic behaviour of solutions in the future time is investigated in
various aspects.... | [
{
"created": "Tue, 12 Aug 2003 12:44:20 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lee",
"Hayoung",
""
]
] | We study locally spatially homogeneous solutions of the Einstein-Vlasov system with a positive cosmological constant. First the global existence of solutions of this system and the casual geodesic completeness are shown. Then the asymptotic behaviour of solutions in the future time is investigated in various aspects. |
1202.0526 | Roberto Pereira | Daniele Oriti, Roberto Pereira and Lorenzo Sindoni | Coherent states for quantum gravity: towards collective variables | 25 pages, 1 figure | null | 10.1088/0264-9381/29/13/135002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the construction of coherent states for quantum theories of
connections based on graphs embedded in a spatial manifold, as in loop quantum
gravity. We discuss the many subtleties of the construction, mainly related to
the diffeomorphism invariance of the theory. Aiming at approximating a
continuum geom... | [
{
"created": "Thu, 2 Feb 2012 19:49:40 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Oriti",
"Daniele",
""
],
[
"Pereira",
"Roberto",
""
],
[
"Sindoni",
"Lorenzo",
""
]
] | We investigate the construction of coherent states for quantum theories of connections based on graphs embedded in a spatial manifold, as in loop quantum gravity. We discuss the many subtleties of the construction, mainly related to the diffeomorphism invariance of the theory. Aiming at approximating a continuum geomet... |
1908.04760 | Tiberiu Harko | Yixin Xu, Guangjie Li, Tiberiu Harko, Shi-Dong Liang | $f(Q,T)$ gravity | 18 pages, 3 figures, accepted for publication in EPJC; references
added | The European Physical Journal C 79, 708 (2019) | 10.1140/epjc/s10052-019-7207-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an extension of the symmetric teleparallel gravity, in which the
gravitational action $L$ is given by an arbitrary function $f$ of the
nonmetricity $Q$ and of the trace of the matter energy-momentum tensor $T$, so
that $L=f(Q,T)$. The field equations of the theory are obtained by varying the
gravitational ... | [
{
"created": "Sat, 10 Aug 2019 10:05:53 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Aug 2019 04:30:29 GMT",
"version": "v2"
}
] | 2020-05-19 | [
[
"Xu",
"Yixin",
""
],
[
"Li",
"Guangjie",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Liang",
"Shi-Dong",
""
]
] | We propose an extension of the symmetric teleparallel gravity, in which the gravitational action $L$ is given by an arbitrary function $f$ of the nonmetricity $Q$ and of the trace of the matter energy-momentum tensor $T$, so that $L=f(Q,T)$. The field equations of the theory are obtained by varying the gravitational ac... |
1209.1969 | Alessandro D.A.M. Spallicci di Filottrano | Alessandro Spallicci, Patxi Ritter, Sylvain Jubertie, St\`ephane
Cordier, Sofiane Aoudia | Towards a self-consistent orbital evolution for EMRIs | IX Lisa Conference (held the 21-25 May 2012 in Paris) Proceedings by
the Astronomical Society of the Pacific Conference Serie | null | null | null | gr-qc astro-ph.HE math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We intend to develop part of the theoretical tools needed for the detection
of gravitational waves coming from the capture of a compact object, 1-100 solar
masses, by a Supermassive Black Hole, up to a 10 billion solar masses, located
at the centre of most galaxies. The analysis of the accretion activity unveils
the ... | [
{
"created": "Mon, 10 Sep 2012 12:49:51 GMT",
"version": "v1"
}
] | 2012-09-11 | [
[
"Spallicci",
"Alessandro",
""
],
[
"Ritter",
"Patxi",
""
],
[
"Jubertie",
"Sylvain",
""
],
[
"Cordier",
"Stèphane",
""
],
[
"Aoudia",
"Sofiane",
""
]
] | We intend to develop part of the theoretical tools needed for the detection of gravitational waves coming from the capture of a compact object, 1-100 solar masses, by a Supermassive Black Hole, up to a 10 billion solar masses, located at the centre of most galaxies. The analysis of the accretion activity unveils the st... |
2006.08111 | Haryanto Siahaan | Haryanto M. Siahaan | Rotating and charged Taub-NUT-(A)dS spacetimes on a 3-brane | 21 pages, 4 figures; v2, refs added | Phys. Rev. D 102, 064022 (2020) | 10.1103/PhysRevD.102.064022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct novel solutions to the effective Einstein equation with four
dimensional cosmological constant on a 3-brane in Randall-Sundrum II scenario.
The charged solution is obtained by assuming the existence of localized Maxwell
fields on the 3-brane. Timelike and null circular geodesics in the neutral
rotating b... | [
{
"created": "Mon, 15 Jun 2020 03:47:45 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Aug 2020 11:02:18 GMT",
"version": "v2"
}
] | 2020-09-16 | [
[
"Siahaan",
"Haryanto M.",
""
]
] | We construct novel solutions to the effective Einstein equation with four dimensional cosmological constant on a 3-brane in Randall-Sundrum II scenario. The charged solution is obtained by assuming the existence of localized Maxwell fields on the 3-brane. Timelike and null circular geodesics in the neutral rotating bra... |
0710.0879 | Yosef Zlochower | Manuela Campanelli, Carlos O. Lousto, Yosef Zlochower | Close encounters of three black holes | 4 pages, 5 figures | Phys.Rev.D77:101501,2008 | 10.1103/PhysRevD.77.101501 | null | gr-qc astro-ph | null | We present the first fully relativistic longterm numerical evolutions of
three equal-mass black holes in a system consisting of a third black hole in a
close orbit about a black-hole binary. We find that these
close-three-black-hole systems have very different merger dynamics from
black-hole binaries. In particular, ... | [
{
"created": "Wed, 3 Oct 2007 23:46:17 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2008 16:06:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Campanelli",
"Manuela",
""
],
[
"Lousto",
"Carlos O.",
""
],
[
"Zlochower",
"Yosef",
""
]
] | We present the first fully relativistic longterm numerical evolutions of three equal-mass black holes in a system consisting of a third black hole in a close orbit about a black-hole binary. We find that these close-three-black-hole systems have very different merger dynamics from black-hole binaries. In particular, we... |
1606.05894 | Amir M. Abbassi | Habib Abedi and Amir M. Abbassi | Hubble multi-scalar inflation | 17 pages, No fig., JCAP style | null | 10.1088/1475-7516/2017/07/049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Multiple field models of inflation exhibit new features than single field
models. In this work, we study the hierarchy of parameters based on Hubble
expansion rate in curved field space and derive the system of flow equations
that describe their evolution. Then we focus on obtaining derivatives of number
of $e$-folds... | [
{
"created": "Sun, 19 Jun 2016 17:56:07 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Abedi",
"Habib",
""
],
[
"Abbassi",
"Amir M.",
""
]
] | Multiple field models of inflation exhibit new features than single field models. In this work, we study the hierarchy of parameters based on Hubble expansion rate in curved field space and derive the system of flow equations that describe their evolution. Then we focus on obtaining derivatives of number of $e$-folds w... |
1302.2697 | Sayan Kar | Soumya Jana and Sayan Kar (IIT Kharagpur, India) | Three dimensional Eddington--inspired Born--Infeld gravity: solutions | 13 pages, 8 figures, revised, corrected and extended version | Phys. Rev. D 88, 024013 (2013) | 10.1103/PhysRevD.88.024013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Three dimensional Eddington-inspired Born--Infeld gravity is studied with the
goal of finding new solutions. Beginning with cosmology, we obtain analytical
and numerical solutions for the scale factor, a(t), in spatially flat (k=0) and
spatially curved (k=+1,-1) Friedmann-Roberston-Walker universes with (i)
pressurel... | [
{
"created": "Tue, 12 Feb 2013 04:12:06 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2013 05:58:03 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Jana",
"Soumya",
"",
"IIT Kharagpur, India"
],
[
"Kar",
"Sayan",
"",
"IIT Kharagpur, India"
]
] | Three dimensional Eddington-inspired Born--Infeld gravity is studied with the goal of finding new solutions. Beginning with cosmology, we obtain analytical and numerical solutions for the scale factor, a(t), in spatially flat (k=0) and spatially curved (k=+1,-1) Friedmann-Roberston-Walker universes with (i) pressureles... |
1012.1445 | Ujjal Debnath | Piyali Bagchi Khatua and Ujjal Debnath | Dynamics of Logamediate and Intermediate Scenarios in the Dark Energy
Filled Universe | 28 pages, 20 figures | Int.J.Theor.Phys.50:799-832,2011 | 10.1007/s10773-010-0617-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have considered a model of two component mixture i.e., mixture of
Chaplygin gas and barotropic fluid with tachyonic field. In the case, when they
have no interaction then both of them retain their own properties. Let us
consider an energy flow between barotropic and tachyonic fluids. In both the
cases we find the ... | [
{
"created": "Tue, 7 Dec 2010 10:24:08 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Khatua",
"Piyali Bagchi",
""
],
[
"Debnath",
"Ujjal",
""
]
] | We have considered a model of two component mixture i.e., mixture of Chaplygin gas and barotropic fluid with tachyonic field. In the case, when they have no interaction then both of them retain their own properties. Let us consider an energy flow between barotropic and tachyonic fluids. In both the cases we find the ex... |
1805.04091 | Frans Klinkhamer | F.R. Klinkhamer, J.M. Queiruga | A stealth defect of spacetime | 12 pages, v5: published version | Mod. Phys. Lett. A 33 (2018) 1850127 | 10.1142/S0217732318501274 | KA-TP-13-2018 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a special type of Skyrmion spacetime-defect solution, which has a
positive energy density of the matter fields but a vanishing asymptotic
gravitational mass. With a mass term for the matter field added to the action
(corresponding to massive "pions" in the Skyrme model), this particular
soliton-type soluti... | [
{
"created": "Thu, 10 May 2018 17:46:01 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2018 17:29:06 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Jun 2018 15:05:50 GMT",
"version": "v3"
},
{
"created": "Mon, 11 Jun 2018 07:11:58 GMT",
"version": "v4"
},
{
"cr... | 2018-08-08 | [
[
"Klinkhamer",
"F. R.",
""
],
[
"Queiruga",
"J. M.",
""
]
] | We discuss a special type of Skyrmion spacetime-defect solution, which has a positive energy density of the matter fields but a vanishing asymptotic gravitational mass. With a mass term for the matter field added to the action (corresponding to massive "pions" in the Skyrme model), this particular soliton-type solution... |
0712.3709 | Christian Magnan | Christian Magnan | Complete calculations of the perihelion precession of Mercury and the
deflection of light by the Sun in General Relativity | 17 pages, 3 figures | null | null | null | gr-qc | null | Taking up a method devised by Taylor and Wheeler and collecting pieces of
their work we offer a self-contained derivation of the formulae giving both the
precession of the orbit of a planet around the Sun and the deflection angle of
a light pulse passing near the Sun in the framework of General Relativity. The
demons... | [
{
"created": "Fri, 21 Dec 2007 14:58:13 GMT",
"version": "v1"
}
] | 2007-12-24 | [
[
"Magnan",
"Christian",
""
]
] | Taking up a method devised by Taylor and Wheeler and collecting pieces of their work we offer a self-contained derivation of the formulae giving both the precession of the orbit of a planet around the Sun and the deflection angle of a light pulse passing near the Sun in the framework of General Relativity. The demonstr... |
gr-qc/0109077 | Vitorio A. De Lorenci | V. A. De Lorenci and E. S. Moreira Jr (EFEI - Itajuba') | Classical self-forces in a space with a dispiration | 5 pages, 4 figures, revtex4 file | Phys.Rev. D65 (2002) 085013 | 10.1103/PhysRevD.65.085013 | null | gr-qc cond-mat.mtrl-sci hep-th | null | We derive the gravitational and electrostatic self-energies of a particle at
rest in the background of a cosmic dispiration (topological defect), finding
that the particle may experience potential steps, well potentials or potential
barriers depending on the nature of the interaction and also on certain
properties of... | [
{
"created": "Fri, 21 Sep 2001 15:19:27 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"De Lorenci",
"V. A.",
"",
"EFEI - Itajuba'"
],
[
"Moreira",
"E. S.",
"Jr",
"EFEI - Itajuba'"
]
] | We derive the gravitational and electrostatic self-energies of a particle at rest in the background of a cosmic dispiration (topological defect), finding that the particle may experience potential steps, well potentials or potential barriers depending on the nature of the interaction and also on certain properties of t... |
0904.3956 | Raymond Chiao Y. | Raymond Y. Chiao | New directions for gravitational wave physics via "Millikan oil drops" | 37 pages, 4 figures | null | null | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | "Millikan oil drops" are drops of superfluid helium coated with electrons,
and levitated in a strong, inhomogeneous magnetic field. When the temperature
of the system becomes very low compared to the cyclotron gap energy, the system
remains in its quantum ground state. Two such levitated charged drops can have
their ... | [
{
"created": "Sat, 25 Apr 2009 03:47:00 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2009 18:34:39 GMT",
"version": "v2"
}
] | 2009-04-29 | [
[
"Chiao",
"Raymond Y.",
""
]
] | "Millikan oil drops" are drops of superfluid helium coated with electrons, and levitated in a strong, inhomogeneous magnetic field. When the temperature of the system becomes very low compared to the cyclotron gap energy, the system remains in its quantum ground state. Two such levitated charged drops can have their ch... |
2102.05443 | Muhammad Sharif | M. Sharif and Faisal Javed | Stability of Charged Thin-Shell Gravastars with Quintessence | 23 pages, 9 figures | Eur. Phys. J. C 81(2021)47 | 10.1140/epjc/s10052-020-08802-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper develops a new solution of gravitational vacuum star in the
background of charged Kiselev black holes as an exterior manifold. We explore
physical features and stability of thin-shell gravastars with radial
perturbation. The matter thin layer located at thin-shell greatly affects
stable configuration of th... | [
{
"created": "Tue, 9 Feb 2021 07:21:55 GMT",
"version": "v1"
}
] | 2021-02-17 | [
[
"Sharif",
"M.",
""
],
[
"Javed",
"Faisal",
""
]
] | This paper develops a new solution of gravitational vacuum star in the background of charged Kiselev black holes as an exterior manifold. We explore physical features and stability of thin-shell gravastars with radial perturbation. The matter thin layer located at thin-shell greatly affects stable configuration of the ... |
1311.6117 | Miguel Campiglia | Miguel Campiglia and Madhavan Varadarajan | The Koslowski- Sahlmann representation: Gauge and diffeomorphism
invariance | null | Class.Quant.Grav. 31 (2014) 075002 | 10.1088/0264-9381/31/7/075002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discrete spatial geometry underlying Loop Quantum Gravity (LQG) is
degenerate almost everywhere. This is at apparent odds with the non- degeneracy
of asymptotically flat metrics near spatial infinity. Koslowski generalised the
LQG representation so as to describe states labelled by smooth non- degenerate
triad fi... | [
{
"created": "Sun, 24 Nov 2013 13:21:42 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Campiglia",
"Miguel",
""
],
[
"Varadarajan",
"Madhavan",
""
]
] | The discrete spatial geometry underlying Loop Quantum Gravity (LQG) is degenerate almost everywhere. This is at apparent odds with the non- degeneracy of asymptotically flat metrics near spatial infinity. Koslowski generalised the LQG representation so as to describe states labelled by smooth non- degenerate triad fiel... |
0911.2653 | Carlo Rovelli | Marco Valerio Battisti, Antonino Marciano, Carlo Rovelli | Triangulated Loop Quantum Cosmology: Bianchi IX and inhomogenous
perturbations | 21 pages | Phys.Rev.D81:064019,2010 | 10.1103/PhysRevD.81.064019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop the "triangulated" version of loop quantum cosmology, recently
introduced in the literature. We focus on the "dipole" cosmology, where space
is a three-sphere and the triangulation is formed by two tetrahedra. We show
that the discrete fiducial connection has a simple and appealing geometrical
interpretati... | [
{
"created": "Fri, 13 Nov 2009 17:09:16 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Feb 2010 16:14:11 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Battisti",
"Marco Valerio",
""
],
[
"Marciano",
"Antonino",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We develop the "triangulated" version of loop quantum cosmology, recently introduced in the literature. We focus on the "dipole" cosmology, where space is a three-sphere and the triangulation is formed by two tetrahedra. We show that the discrete fiducial connection has a simple and appealing geometrical interpretation... |
1604.02375 | Emanuele Alesci | Emanuele Alesci and Francesco Cianfrani | Improved regularization from Quantum Reduced Loop Gravity | 5 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The choice of the regularization scheme in Loop Quantum Cosmology (LQC) is
crucial for the predicted phenomenology. We outline how the improved scheme can
be naturally realized in Quantum Reduced Loop Gravity, describing the Universe
as an ensemble of microstates labeled by different graphs. The new effective
dynamic... | [
{
"created": "Fri, 8 Apr 2016 15:29:39 GMT",
"version": "v1"
}
] | 2016-04-11 | [
[
"Alesci",
"Emanuele",
""
],
[
"Cianfrani",
"Francesco",
""
]
] | The choice of the regularization scheme in Loop Quantum Cosmology (LQC) is crucial for the predicted phenomenology. We outline how the improved scheme can be naturally realized in Quantum Reduced Loop Gravity, describing the Universe as an ensemble of microstates labeled by different graphs. The new effective dynamics ... |
1306.5395 | Stephen Taylor | Stephen R. Taylor, Jonathan R. Gair | Searching For Anisotropic Gravitational-wave Backgrounds Using Pulsar
Timing Arrays | 26 pages, 21 figures, 3 tables. Minor typos corrected, and references
added. Modifications to Fig. 4, 10, 17. Submitted to PRD | Phys. Rev. D 88, 084001 (2013) | 10.1103/PhysRevD.88.084001 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of simulated injections testing the first Bayesian
search-pipeline capable of investigating the angular-structure of a
gravitational-wave (GW) background influencing pulsar signals. A stochastic
background of GWs from the incoherent superposition of many inspiraling
supermassive black hole bina... | [
{
"created": "Sun, 23 Jun 2013 12:29:01 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2013 19:56:28 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Taylor",
"Stephen R.",
""
],
[
"Gair",
"Jonathan R.",
""
]
] | We present the results of simulated injections testing the first Bayesian search-pipeline capable of investigating the angular-structure of a gravitational-wave (GW) background influencing pulsar signals. A stochastic background of GWs from the incoherent superposition of many inspiraling supermassive black hole binari... |
gr-qc/0510127 | Paul Langlois | Paul Langlois | Imprints of Spacetime Topology in the Hawking-Unruh Effect | PhD Thesis, 205 pages | null | null | null | gr-qc | null | The Unruh and Hawking effects are investigated on certain families of
topologically non-trivial spacetimes using a variety of techniques. First we
present the Bogolubov transformation between Rindler and Minkowski
quantizations on two flat spacetimes with topology ${\R}^3\times{S^1}$ (M_0 and
M_-) for massive Dirac s... | [
{
"created": "Mon, 31 Oct 2005 17:23:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Langlois",
"Paul",
""
]
] | The Unruh and Hawking effects are investigated on certain families of topologically non-trivial spacetimes using a variety of techniques. First we present the Bogolubov transformation between Rindler and Minkowski quantizations on two flat spacetimes with topology ${\R}^3\times{S^1}$ (M_0 and M_-) for massive Dirac spi... |
0709.2373 | Christian Beck | Christian Beck, Clovis Jacinto de Matos | The dark energy scale in superconductors: Innovative theoretical and
experimental concepts | 19 pages, no figures | null | null | null | gr-qc | null | We revisit the cosmological constant problem using the viewpoint that the
observed value of dark energy density in the universe actually represents a
rather natural value arising as the geometric mean of two vacuum energy
densities, one being extremely large and the other one being extremely small.
The corresponding ... | [
{
"created": "Fri, 14 Sep 2007 20:07:40 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Apr 2008 17:57:54 GMT",
"version": "v2"
}
] | 2008-04-24 | [
[
"Beck",
"Christian",
""
],
[
"de Matos",
"Clovis Jacinto",
""
]
] | We revisit the cosmological constant problem using the viewpoint that the observed value of dark energy density in the universe actually represents a rather natural value arising as the geometric mean of two vacuum energy densities, one being extremely large and the other one being extremely small. The corresponding me... |
1312.4844 | Sergiu I. Vacaru | Tamara Gheorghiu, Olivia Vacaru and Sergiu I. Vacaru | Off-Diagonal Deformations of Kerr Black Holes in Einstein and Modified
Massive Gravity and Higher Dimensions | latex 2e, 11pt, 35 pages with table of content; version 2 modified
following Editor's requests and accepted to EPJC | Eur. Phys. J. C 74 (2014) 3152 | 10.1140/epjc/s10052-014-3152-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find general parameterizations for generic off-diagonal spacetime metrics
and matter sources in general relativity (GR) and modified gravity theories
when the field equations decouple with respect to certain types of nonholonomic
frames of reference. This allows us to construct various classes of exact
solutions w... | [
{
"created": "Mon, 16 Dec 2013 15:28:34 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Oct 2014 08:52:22 GMT",
"version": "v2"
}
] | 2014-12-25 | [
[
"Gheorghiu",
"Tamara",
""
],
[
"Vacaru",
"Olivia",
""
],
[
"Vacaru",
"Sergiu I.",
""
]
] | We find general parameterizations for generic off-diagonal spacetime metrics and matter sources in general relativity (GR) and modified gravity theories when the field equations decouple with respect to certain types of nonholonomic frames of reference. This allows us to construct various classes of exact solutions whe... |
1512.06975 | Shabbir Ghulam | Ghulam Shabbir, Amjad Ali | A note on proper curvature collineations in Bianchi types VI_{0} and
VII_{0} space-times | 8 pages. arXiv admin note: substantial text overlap with
arXiv:1512.06957, arXiv:1309.7462 | Adv. Studies Theor. Phys. 4 (2010) 535-542 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study proper curvature collineations in the most general form of the
Bianchi types VI_{0} and VII_{0} space-times using the rank of the 6X6 Riemann
matrix and direct integration technique. It is shown that when the above
space-times admit proper curvature collineations, they form an infinite
dimensional vector spa... | [
{
"created": "Tue, 22 Dec 2015 07:29:46 GMT",
"version": "v1"
}
] | 2015-12-24 | [
[
"Shabbir",
"Ghulam",
""
],
[
"Ali",
"Amjad",
""
]
] | We study proper curvature collineations in the most general form of the Bianchi types VI_{0} and VII_{0} space-times using the rank of the 6X6 Riemann matrix and direct integration technique. It is shown that when the above space-times admit proper curvature collineations, they form an infinite dimensional vector space... |
1706.09065 | Giulia Gubitosi | Giulia Gubitosi and Joao Magueijo | The phenomenology of squeezing and its status in non-inflationary
theories | v2: Typos corrected. Matches the accepted version on JCAP | null | 10.1088/1475-7516/2017/11/014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we skim the true phenomenological requirements behind the
concept of inflationary squeezing. We argue that all that is required is that
at horizon re-entry the fluctuations form standing waves with the correct
temporal phase (specifically, sine waves). We quantify this requirement and
relate it to the i... | [
{
"created": "Tue, 27 Jun 2017 22:12:30 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2017 11:21:06 GMT",
"version": "v2"
}
] | 2017-11-15 | [
[
"Gubitosi",
"Giulia",
""
],
[
"Magueijo",
"Joao",
""
]
] | In this paper we skim the true phenomenological requirements behind the concept of inflationary squeezing. We argue that all that is required is that at horizon re-entry the fluctuations form standing waves with the correct temporal phase (specifically, sine waves). We quantify this requirement and relate it to the ini... |
2301.07694 | Nicolas Heimann | Nicolas Heimann, Jan Petermann, Daniel Hartwig, Roman Schnabel, Ludwig
Mathey | Predicting the motion of a high-Q pendulum subject to seismic
perturbations using machine learning | 10 pages, 7 figures | Appl. Phys. Lett. 122, 254101 (2023) | 10.1063/5.0144593 | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The seismically excited motion of high-Q pendula in gravitational-wave
observatories sets a sensitivity limit to sub-audio gravitational-wave
frequencies. Here, we report on the use of machine learning to predict the
motion of a high-Q pendulum with a resonance frequency of 1.4Hz that is driven
by natural seismic act... | [
{
"created": "Wed, 18 Jan 2023 18:34:22 GMT",
"version": "v1"
},
{
"created": "Sat, 20 May 2023 12:39:40 GMT",
"version": "v2"
}
] | 2023-08-11 | [
[
"Heimann",
"Nicolas",
""
],
[
"Petermann",
"Jan",
""
],
[
"Hartwig",
"Daniel",
""
],
[
"Schnabel",
"Roman",
""
],
[
"Mathey",
"Ludwig",
""
]
] | The seismically excited motion of high-Q pendula in gravitational-wave observatories sets a sensitivity limit to sub-audio gravitational-wave frequencies. Here, we report on the use of machine learning to predict the motion of a high-Q pendulum with a resonance frequency of 1.4Hz that is driven by natural seismic activ... |
2207.00667 | Takuya Tsutsui | Takuya Tsutsui, Atsushi Nishizawa | Observational constraint on axion dark matter with gravitational waves | PRD version | Phys. Rev. D 106, L081301 (2022) | 10.1103/PhysRevD.106.L081301 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most matter in the Universe is invisible and unknown, which is called dark
matter. A candidate of dark matter is axion, which is an ultra-light particle
motivated as a solution for the CP problem. Axions form clouds in a galactic
halo, amplify, and delay a part of gravitational waves propagating in the
clouds. The Mi... | [
{
"created": "Fri, 1 Jul 2022 21:57:37 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jul 2022 09:39:05 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Jul 2022 14:12:14 GMT",
"version": "v3"
},
{
"created": "Tue, 11 Oct 2022 07:31:30 GMT",
"version": "v4"
}
] | 2022-10-14 | [
[
"Tsutsui",
"Takuya",
""
],
[
"Nishizawa",
"Atsushi",
""
]
] | Most matter in the Universe is invisible and unknown, which is called dark matter. A candidate of dark matter is axion, which is an ultra-light particle motivated as a solution for the CP problem. Axions form clouds in a galactic halo, amplify, and delay a part of gravitational waves propagating in the clouds. The Milk... |
1904.06752 | Roberto Casadio | Roberto Casadio, Michele Lenzi, Octavian Micu | Bootstrapped Newtonian stars and black holes | 27 pages, 17 figures. Version accepted for publication in EPJ C | null | 10.1140/epjc/s10052-019-7410-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study equilibrium configurations of a homogenous ball of matter in a
bootstrapped description of gravity which includes a gravitational
self-interaction term beyond the Newtonian coupling. Both matter density and
pressure are accounted for as sources of the gravitational potential for test
particles. Unlike the ge... | [
{
"created": "Sun, 14 Apr 2019 20:08:58 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Oct 2019 11:37:37 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Casadio",
"Roberto",
""
],
[
"Lenzi",
"Michele",
""
],
[
"Micu",
"Octavian",
""
]
] | We study equilibrium configurations of a homogenous ball of matter in a bootstrapped description of gravity which includes a gravitational self-interaction term beyond the Newtonian coupling. Both matter density and pressure are accounted for as sources of the gravitational potential for test particles. Unlike the gene... |
gr-qc/0303041 | Ciprian Dariescu | Ciprian Dariescu and Marina-Aura Dariescu (U. of Oregon) | First-Order Transitions in Charged Boson Nebulae | 10 pages LaTex, no figures | null | null | null | gr-qc | null | Using the first-order approximating solutions to the
Einstein-Maxwell-Klein-Gordon system of equations for a complex scalar field
minimally coupled to a spherically symmetric spacetime, we study the feedback
of gravity and electric field on the charged scalar source. Within a
perturbative approach, we compute, in the... | [
{
"created": "Mon, 10 Mar 2003 15:54:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dariescu",
"Ciprian",
"",
"U. of Oregon"
],
[
"Dariescu",
"Marina-Aura",
"",
"U. of Oregon"
]
] | Using the first-order approximating solutions to the Einstein-Maxwell-Klein-Gordon system of equations for a complex scalar field minimally coupled to a spherically symmetric spacetime, we study the feedback of gravity and electric field on the charged scalar source. Within a perturbative approach, we compute, in the r... |
1411.0267 | Oleg Zaslavskii | O. B. Zaslavskii | Unbounded energies of debris from head-on particle collisions near black
holes | 8 pages. Final version | Mod. Phys. Lett. A 30 (2015) 1550076 | 10.1142/S0217732315500765 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If two particles move toward a black hole and collide near the horizon, the
energy E_{c.m.} in the centre of mass can grow unbounded. This is a so-called
Ba\~nados-Silk-West (BSW) effect. One of problems creating obstacles to the
possibility of its observation consists in that individual energy E of a
fragment at inf... | [
{
"created": "Sun, 2 Nov 2014 15:20:51 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 2014 12:38:56 GMT",
"version": "v2"
},
{
"created": "Thu, 7 May 2015 19:05:13 GMT",
"version": "v3"
}
] | 2015-05-08 | [
[
"Zaslavskii",
"O. B.",
""
]
] | If two particles move toward a black hole and collide near the horizon, the energy E_{c.m.} in the centre of mass can grow unbounded. This is a so-called Ba\~nados-Silk-West (BSW) effect. One of problems creating obstacles to the possibility of its observation consists in that individual energy E of a fragment at infin... |
gr-qc/0109089 | C. S. Unnikrishnan | C. S. Unnikrishnan (1), G. T. Gillies (2), and R. C. Ritter (2) ((1)
Tata Institute, (2)Univ. Virginia) | An origin of the Universe determined by quantum physics and relativistic
gravity | Standard LaTex, 8 pages | null | null | null | gr-qc astro-ph hep-th quant-ph | null | We discuss the evolution of the Universe from what might be called its
quantum origin. We apply the uncertainty principle to the origin of the
Universe with characteristic time scale equal to the Planck time to obtain its
initial temperature and density. We establish that the subsequent evolution
obeying the Einstein... | [
{
"created": "Thu, 27 Sep 2001 17:52:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Unnikrishnan",
"C. S.",
""
],
[
"Gillies",
"G. T.",
""
],
[
"Ritter",
"R. C.",
""
]
] | We discuss the evolution of the Universe from what might be called its quantum origin. We apply the uncertainty principle to the origin of the Universe with characteristic time scale equal to the Planck time to obtain its initial temperature and density. We establish that the subsequent evolution obeying the Einstein e... |
2306.11751 | Ranjan Sharma | Soumik Bhattacharya, Suntharalingam Thirukkanesh and Ranjan Sharma | Properties of relativistic star in 5-D Einstein-Gauss-Bonnet gravity | null | Mod. Phys. Lett. A, Vol. 38, No. 3 (2023) 2350018 | 10.1142/S0217732323500189 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In recent years, there has been a growing interest in stellar modelling in
the framework of Einstein-Gauss-Bonnet gravity. In this paper, for a
relativistic star in static equilibrium, we invoke the $5$ dimensional
Einstein-Gauss-Bonnet gravity and solve the system by assuming a matter
distribution that admits a line... | [
{
"created": "Mon, 19 Jun 2023 07:06:42 GMT",
"version": "v1"
}
] | 2023-06-22 | [
[
"Bhattacharya",
"Soumik",
""
],
[
"Thirukkanesh",
"Suntharalingam",
""
],
[
"Sharma",
"Ranjan",
""
]
] | In recent years, there has been a growing interest in stellar modelling in the framework of Einstein-Gauss-Bonnet gravity. In this paper, for a relativistic star in static equilibrium, we invoke the $5$ dimensional Einstein-Gauss-Bonnet gravity and solve the system by assuming a matter distribution that admits a linear... |
2208.02224 | Alfredo Lopez Ortega | K. A. Guti\'errez-D\'avila, A. L\'opez-Ortega | Quasinormal frequencies of the dimensionally reduced BTZ black hole | 11 figures, 11 tables, 28 pages. Already published in General
Relativity and Gravitation | Gen. Relativ. Gravit. 54, 73 (2022) | 10.1007/s10714-022-02959-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate numerically the quasinormal frequencies of the Klein-Gordon and
Dirac fields moving in the two-dimensional dimensionally reduced BTZ black
hole. Our work extends results previously published on the damped oscillations
of this black hole. First, we compute the quasinormal frequencies of the
minimally coup... | [
{
"created": "Wed, 3 Aug 2022 17:24:15 GMT",
"version": "v1"
}
] | 2022-08-04 | [
[
"Gutiérrez-Dávila",
"K. A.",
""
],
[
"López-Ortega",
"A.",
""
]
] | We calculate numerically the quasinormal frequencies of the Klein-Gordon and Dirac fields moving in the two-dimensional dimensionally reduced BTZ black hole. Our work extends results previously published on the damped oscillations of this black hole. First, we compute the quasinormal frequencies of the minimally couple... |
gr-qc/0512021 | M Iftime | Mihaela Iftime and John Stachel | The Hole Argument for Covariant Theories | Keywords: General Relativity, Differential Geometry. to appear in the
GRG | Gen.Rel.Grav. 38 (2006) 1241-1252 | 10.1007/s10714-006-0303-4 | null | gr-qc | null | The hole argument was developed by Einstein in 1913 while he was searching
for a relativistic theory of gravitation. Einstein used the language of
coordinate systems and coordinate invariance, rather than the language of
manifolds and diffeomorphism invariance. He formulated the hole argument
against covariant field ... | [
{
"created": "Sun, 4 Dec 2005 21:46:47 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Apr 2006 15:26:43 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Iftime",
"Mihaela",
""
],
[
"Stachel",
"John",
""
]
] | The hole argument was developed by Einstein in 1913 while he was searching for a relativistic theory of gravitation. Einstein used the language of coordinate systems and coordinate invariance, rather than the language of manifolds and diffeomorphism invariance. He formulated the hole argument against covariant field eq... |
gr-qc/9307036 | null | Andrew R Liddle | Can the Gravitational Wave Background from Inflation be Detected
Locally? | 8 pages, standard LaTeX (no figures), SUSSEX-AST 93/7-3 | Phys.Rev.D49:3805,1994; Erratum-ibid.D51:4603,1995;
Phys.Rev.D51:4603,1995 | 10.1103/PhysRevD.49.3805 10.1103/PhysRevD.51.4603 | null | gr-qc astro-ph | null | The Cosmic Background Explorer (COBE) detection of microwave background
anisotropies may contain a component due to gravitational waves generated by
inflation. It is shown that the gravitational waves from inflation might be
seen using `beam-in-space' detectors, but not the Laser Interferometer Gravity
Wave Observato... | [
{
"created": "Mon, 26 Jul 1993 15:01:00 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Liddle",
"Andrew R",
""
]
] | The Cosmic Background Explorer (COBE) detection of microwave background anisotropies may contain a component due to gravitational waves generated by inflation. It is shown that the gravitational waves from inflation might be seen using `beam-in-space' detectors, but not the Laser Interferometer Gravity Wave Observatory... |
1802.06778 | Heba Sami | Heba Sami and Amare Abebe | Quasi-Newtonian Cosmological Models in Scalar-Tensor Theories of Gravity | 6 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution, classes of shear-free cosmological dust models with
irrotational fluid flows will be investigated in the context of scalar-tensor
theories of gravity. In particular, the integrability conditions describing a
consistent evolution of the linearised field equations of quasi-Newtonian
universes are ... | [
{
"created": "Mon, 19 Feb 2018 08:05:23 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Feb 2018 04:47:52 GMT",
"version": "v2"
}
] | 2018-02-22 | [
[
"Sami",
"Heba",
""
],
[
"Abebe",
"Amare",
""
]
] | In this contribution, classes of shear-free cosmological dust models with irrotational fluid flows will be investigated in the context of scalar-tensor theories of gravity. In particular, the integrability conditions describing a consistent evolution of the linearised field equations of quasi-Newtonian universes are pr... |
2212.03031 | Timothy Budd | Timothy Budd | Lessons from the Mathematics of Two-Dimensional Euclidean Quantum
Gravity | 51 pages, 20 figures. Invited chapter for the Section "Causal
Dynamical Triangulations" of the "Handbook of Quantum Gravity" (Eds. C.
Bambi, L. Modesto and I.L. Shapiro, Springer Singapore, expected in 2023).
v2: Fixed several small errors | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The search for a mathematical foundation for the path integral of Euclidean
quantum gravity calls for the construction of random geometry on the spacetime
manifold. Following developments in physics on the two-dimensional theory,
random geometry on the 2-sphere has in recent years received much attention in
the mathe... | [
{
"created": "Tue, 6 Dec 2022 15:01:59 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2023 07:20:00 GMT",
"version": "v2"
}
] | 2023-07-20 | [
[
"Budd",
"Timothy",
""
]
] | The search for a mathematical foundation for the path integral of Euclidean quantum gravity calls for the construction of random geometry on the spacetime manifold. Following developments in physics on the two-dimensional theory, random geometry on the 2-sphere has in recent years received much attention in the mathema... |
2210.10658 | Zhong-Wen Feng | Qi-Min Feng, Zhong-Wen Feng, Xia Zhou, Qing-Quan Jiang | Barrow entropy and stochastic gravitational wave background generated
from cosmological QCD phase transition | 9 pages, 5 figures | Physics Letters B 2023,838: 137739 | 10.1016/j.physletb.2023.137739 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work we investigate the stochastic gravitational wave background
generated during the f\/irst-order cosmological QCD phase transition of the
early universe in the framework of the Barrow entropy. We f\/irst derived the
Barrow corrections to the expression of stochastic gravitational wave
background spectrum i... | [
{
"created": "Mon, 17 Oct 2022 07:29:11 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Nov 2022 02:31:48 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Feb 2023 08:33:11 GMT",
"version": "v3"
}
] | 2023-02-14 | [
[
"Feng",
"Qi-Min",
""
],
[
"Feng",
"Zhong-Wen",
""
],
[
"Zhou",
"Xia",
""
],
[
"Jiang",
"Qing-Quan",
""
]
] | In this work we investigate the stochastic gravitational wave background generated during the f\/irst-order cosmological QCD phase transition of the early universe in the framework of the Barrow entropy. We f\/irst derived the Barrow corrections to the expression of stochastic gravitational wave background spectrum in ... |
1803.09818 | Yong Cai | Chunlong Li, Yong Cai, Yi-Fu Cai, Emmanuel N. Saridakis | The effective field theory approach of teleparallel gravity, $f(T)$
gravity and beyond | 23 pages, 4 figures; v2: updated to match published version, includes
extended discussion and new references | JCAP 10 (2018) 001 | 10.1088/1475-7516/2018/10/001 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop the effective field theory approach to torsional modified
gravities, a formalism that allows for the systematic investigation of the
background and perturbation levels separately. Starting from the usual
effective field theory approach to curvature-based gravity, we suitably
generalize it at the background... | [
{
"created": "Mon, 26 Mar 2018 20:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Oct 2018 14:45:15 GMT",
"version": "v2"
}
] | 2018-10-03 | [
[
"Li",
"Chunlong",
""
],
[
"Cai",
"Yong",
""
],
[
"Cai",
"Yi-Fu",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We develop the effective field theory approach to torsional modified gravities, a formalism that allows for the systematic investigation of the background and perturbation levels separately. Starting from the usual effective field theory approach to curvature-based gravity, we suitably generalize it at the background l... |
gr-qc/0702107 | Steven Carlip | S. Carlip | Black Hole Thermodynamics from Euclidean Horizon Constraints | 4 pages, revtex; v2: changes in emphasis in abstract and
introduction, typos fixed | Phys.Rev.Lett.99:021301,2007 | 10.1103/PhysRevLett.99.021301 | null | gr-qc hep-th | null | To explain black hole thermodynamics in quantum gravity, one must introduce
constraints to ensure that a black hole is actually present. I show that for a
large class of black holes, such ``horizon constraints'' allow the use of
conformal field theory techniques to compute the density of states, reproducing
the Beken... | [
{
"created": "Tue, 20 Feb 2007 01:13:42 GMT",
"version": "v1"
},
{
"created": "Fri, 25 May 2007 21:35:25 GMT",
"version": "v2"
}
] | 2010-04-28 | [
[
"Carlip",
"S.",
""
]
] | To explain black hole thermodynamics in quantum gravity, one must introduce constraints to ensure that a black hole is actually present. I show that for a large class of black holes, such ``horizon constraints'' allow the use of conformal field theory techniques to compute the density of states, reproducing the Bekenst... |
1210.0750 | Robert Martin | Achim Kempf, Robert T.W. Martin, Aidan Chatwin-Davies | A fully covariant information-theoretic ultraviolet cutoff for scalar
fields in expanding FRW spacetimes | null | null | 10.1063/1.4790482 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While a natural ultraviolet cutoff, presumably at the Planck length, is
widely assumed to exist in nature, it has proven difficult to implement a
minimum length scale covariantly. A key reason is that the presence of a fixed
minimum length would seem to contradict the ability of Lorentz transformations
to contract le... | [
{
"created": "Tue, 2 Oct 2012 12:35:06 GMT",
"version": "v1"
}
] | 2016-11-26 | [
[
"Kempf",
"Achim",
""
],
[
"Martin",
"Robert T. W.",
""
],
[
"Chatwin-Davies",
"Aidan",
""
]
] | While a natural ultraviolet cutoff, presumably at the Planck length, is widely assumed to exist in nature, it has proven difficult to implement a minimum length scale covariantly. A key reason is that the presence of a fixed minimum length would seem to contradict the ability of Lorentz transformations to contract leng... |
gr-qc/9610056 | Dr S. L. Braunstein | Samuel L. Braunstein (SEECS, University of Wales, Bangor, UK) | A toy model for slowly growing wormholes as effective topology changes | latex with revtex, 5 pages, 4 figures | null | null | null | gr-qc hep-th | null | We present a toy model for growing wormholes as a model of effective
low-energy topology changes. We study the propagation of quantum fields on a
$1+1$ spacetime analogous to the trouser-leg topology change. A low-energy
effective topology change is produced by a physical model which corresponds to
a barrier smoothly... | [
{
"created": "Thu, 24 Oct 1996 14:45:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Braunstein",
"Samuel L.",
"",
"SEECS, University of Wales, Bangor, UK"
]
] | We present a toy model for growing wormholes as a model of effective low-energy topology changes. We study the propagation of quantum fields on a $1+1$ spacetime analogous to the trouser-leg topology change. A low-energy effective topology change is produced by a physical model which corresponds to a barrier smoothly c... |
1706.07661 | Bivudutta Mishra Dr. | B. Mishra, Pratik P. Ray, S.K.J. Pacif | Anisotropic cosmological models with two fluids | 10 pages, 12 figures | Advances in High Energy Physics, Vol. 2018, Article ID 6306848, 9
Pages | 10.1155/2018/6306848 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, aniostropic dark energy cosmological models have been
constructed in a Bianchi-V space-time with the energy momentum tensor
consisting of two non-interacting fluids namely bulk viscous fluid and dark
energy fluid. Two different models are constructed based on the power law
cosmology and de Sitter unive... | [
{
"created": "Wed, 21 Jun 2017 11:05:42 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jan 2018 15:05:19 GMT",
"version": "v2"
}
] | 2018-02-01 | [
[
"Mishra",
"B.",
""
],
[
"Ray",
"Pratik P.",
""
],
[
"Pacif",
"S. K. J.",
""
]
] | In this paper, aniostropic dark energy cosmological models have been constructed in a Bianchi-V space-time with the energy momentum tensor consisting of two non-interacting fluids namely bulk viscous fluid and dark energy fluid. Two different models are constructed based on the power law cosmology and de Sitter univers... |
1804.04147 | Francesca Vidotto | Carlo Rovelli, Francesca Vidotto | White-hole dark matter and the origin of past low-entropy | Short entry. Essay written for the Gravity Research Foundation 2018
Awards for Essays on Gravitation. The ideas briefly introduced in this paper
are developped in arXiv:1805.03872 and arXiv:1805.03224 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent results on the end of black hole evaporation give new weight to the
hypothesis that a component of dark matter could be formed by remnants of
evaporated black holes: stable Planck-size white holes with a large interior.
The expected lifetime of these objects is consistent with their production at
reheating. Bu... | [
{
"created": "Wed, 11 Apr 2018 18:01:43 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Apr 2018 21:37:50 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Nov 2018 15:00:33 GMT",
"version": "v3"
}
] | 2018-12-13 | [
[
"Rovelli",
"Carlo",
""
],
[
"Vidotto",
"Francesca",
""
]
] | Recent results on the end of black hole evaporation give new weight to the hypothesis that a component of dark matter could be formed by remnants of evaporated black holes: stable Planck-size white holes with a large interior. The expected lifetime of these objects is consistent with their production at reheating. But ... |
1709.01933 | Shahar Hod | Shahar Hod | No nonminimally coupled massless scalar hair for spherically symmetric
neutral reflecting stars | 6 pages | Physical Review D 96, 024019 (2017) | 10.1103/PhysRevD.96.024019 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been proved that horizonless compact stars with reflecting
boundary conditions {\it cannot} support spatially regular matter
configurations made of minimally coupled scalar fields, vector fields, and
tensor fields. In the present paper we extend this intriguing no-hair property
to the physically inter... | [
{
"created": "Wed, 6 Sep 2017 18:00:04 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Hod",
"Shahar",
""
]
] | It has recently been proved that horizonless compact stars with reflecting boundary conditions {\it cannot} support spatially regular matter configurations made of minimally coupled scalar fields, vector fields, and tensor fields. In the present paper we extend this intriguing no-hair property to the physically interes... |
1511.06532 | Orlando Luongo | Peter K. S. Dunsby and Orlando Luongo | On the theory and applications of modern cosmography | null | null | 10.1142/S0219887816300026 | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmography represents an important branch of cosmology which aims to
describe the universe without the need of postulating \emph{a priori} any
particular cosmological model. All quantities of interest are expanded as a
Taylor series around here and now, providing in principle, a way of directly
matching with cosmolo... | [
{
"created": "Fri, 20 Nov 2015 09:24:00 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Dunsby",
"Peter K. S.",
""
],
[
"Luongo",
"Orlando",
""
]
] | Cosmography represents an important branch of cosmology which aims to describe the universe without the need of postulating \emph{a priori} any particular cosmological model. All quantities of interest are expanded as a Taylor series around here and now, providing in principle, a way of directly matching with cosmologi... |
1902.09982 | Hongsheng Zhang | Hongsheng Zhang | A New Property of the Electromagnetic/Yang-Mills-Conformal Gravity
System in Spherical Symmetry | 14 pages | Nuclear Physics B, Volume 940, March 2019, Pages 321-331 | 10.1016/j.nuclphysb.2019.01.019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find a new property in $W^2$-conformal gravity in spherical symmetry. We
demonstrate that the charge of the electromagnetic field varies with respect to
the partial scaling symmetry (conformal transformations in subspaces of a
spacetime) in the conformal gravity. We find that the electric and magnetic
charges can ... | [
{
"created": "Sun, 24 Feb 2019 04:52:24 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"Zhang",
"Hongsheng",
""
]
] | We find a new property in $W^2$-conformal gravity in spherical symmetry. We demonstrate that the charge of the electromagnetic field varies with respect to the partial scaling symmetry (conformal transformations in subspaces of a spacetime) in the conformal gravity. We find that the electric and magnetic charges can va... |
gr-qc/0507097 | Steven D. Penn | Steven D. Penn (1), Alexander Ageev (2), Dan Busby (3), Gregory M.
Harry (4), Andri M. Gretarsson (5), Kenji Numata (6), Phil Willems (3) ((1)
Hobart and William Smith Colleges, (2) Syracuse University, (3) California
Institute of Technology, (4) Massachusetts Institute of Technology, (5) LIGO
Livingston Observ... | Frequency and surface dependence of the mechanical loss in fused silica | 5 pages, 3 figure but 5 figure files | null | 10.1016/j.physleta.2005.11.046 | null | gr-qc | null | We have compiled measurements of the mechanical loss in fused silica from
samples spanning a wide range of geometries and resonant frequency in order to
model the known variation of the loss with frequency and surface-to-volume
ratio. This improved understanding of the mechanical loss has contributed
significantly to... | [
{
"created": "Sat, 23 Jul 2005 03:04:23 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Penn",
"Steven D.",
""
],
[
"Ageev",
"Alexander",
""
],
[
"Busby",
"Dan",
""
],
[
"Harry",
"Gregory M.",
""
],
[
"Gretarsson",
"Andri M.",
""
],
[
"Numata",
"Kenji",
""
],
[
"Willems",
"Phil",
""
]
] | We have compiled measurements of the mechanical loss in fused silica from samples spanning a wide range of geometries and resonant frequency in order to model the known variation of the loss with frequency and surface-to-volume ratio. This improved understanding of the mechanical loss has contributed significantly to t... |
2302.02840 | Hal Haggard | Hal M. Haggard, Jerzy Lewandowski, and Hanno Sahlmann | Emergence of Riemannian Quantum Geometry | 49 pages, 8 figures. This is a preprint of the chapter: "Emergence of
Riemannian Quantum Geometry", to appear in the "Handbook of Quantum Gravity",
edited by Cosimo Bambi, Leonardo Modesto and Ilya Shapiro, 2023, Springer,
reproduced with permission of Springer | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In this chapter we take up the quantum Riemannian geometry of a spatial slice
of spacetime. While researchers are still facing the challenge of observing
quantum gravity, there is a geometrical core to loop quantum gravity that does
much to define the approach. This core is the quantum character of its
geometrical ob... | [
{
"created": "Mon, 6 Feb 2023 15:00:50 GMT",
"version": "v1"
}
] | 2023-02-07 | [
[
"Haggard",
"Hal M.",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Sahlmann",
"Hanno",
""
]
] | In this chapter we take up the quantum Riemannian geometry of a spatial slice of spacetime. While researchers are still facing the challenge of observing quantum gravity, there is a geometrical core to loop quantum gravity that does much to define the approach. This core is the quantum character of its geometrical obse... |
gr-qc/0504074 | Adellane Sousa | A. A. Sousa, R. B. Pereira and J. F. da Rocha-Neto | Angular Momentum of the BTZ Black Hole in the Teleparallel Geometry | 17 pages, no figures, v2: some misprints corrected, Ref.s added, Eq.s
revised, submitted to General Relativity and Gravitation | Prog.Theor.Phys. 114 (2006) 1179-1190 | 10.1143/PTP.114.1179 | null | gr-qc | null | We carry out the Hamiltonian formulation of the three- dimensional
gravitational teleparallelism without imposing the time gauge condition, by
rigorously performing the Legendre transform. Definition of the gravitational
angular momentum arises by suitably interpreting the integral form of the
constraint equation Gam... | [
{
"created": "Mon, 18 Apr 2005 01:35:51 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2005 22:16:15 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Sousa",
"A. A.",
""
],
[
"Pereira",
"R. B.",
""
],
[
"da Rocha-Neto",
"J. F.",
""
]
] | We carry out the Hamiltonian formulation of the three- dimensional gravitational teleparallelism without imposing the time gauge condition, by rigorously performing the Legendre transform. Definition of the gravitational angular momentum arises by suitably interpreting the integral form of the constraint equation Gama^... |
1612.04864 | Recai Erdem | Recai Erdem | Is it possible to obtain cosmic accelerated expansion through energy
transfer between different energy densities? | To be published in Physics of the Dark Universe | null | 10.1016/j.dark.2016.12.001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equation of state of an energy density may be significantly modified by
coupling it to another energy density. In the light of this observation we
check the possibility of producing cosmic accelerated expansion in this way. In
particular we consider the case where matter is converted to radiation (or vice
versa b... | [
{
"created": "Thu, 15 Dec 2016 16:12:35 GMT",
"version": "v1"
}
] | 2016-12-16 | [
[
"Erdem",
"Recai",
""
]
] | The equation of state of an energy density may be significantly modified by coupling it to another energy density. In the light of this observation we check the possibility of producing cosmic accelerated expansion in this way. In particular we consider the case where matter is converted to radiation (or vice versa by ... |
1010.0502 | Francesca Vidotto | Adam Henderson, Carlo Rovelli, Francesca Vidotto, Edward Wilson-Ewing | Local spinfoam expansion in loop quantum cosmology | 12 pages | Class.Quant.Grav.28:025003,2011 | 10.1088/0264-9381/28/2/025003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum dynamics of the flat Friedmann-Lemaitre-Robertson-Walker and
Bianchi I models defined by loop quantum cosmology have recently been
translated into a spinfoam-like formalism. The construction is facilitated by
the presence of a massless scalar field which is used as an internal clock. The
implicit integrat... | [
{
"created": "Mon, 4 Oct 2010 08:35:30 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Nov 2010 16:22:41 GMT",
"version": "v2"
}
] | 2011-01-17 | [
[
"Henderson",
"Adam",
""
],
[
"Rovelli",
"Carlo",
""
],
[
"Vidotto",
"Francesca",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | The quantum dynamics of the flat Friedmann-Lemaitre-Robertson-Walker and Bianchi I models defined by loop quantum cosmology have recently been translated into a spinfoam-like formalism. The construction is facilitated by the presence of a massless scalar field which is used as an internal clock. The implicit integratio... |
1412.2393 | Adam Marsh | Adam Marsh | Riemannian Geometry: Definitions, Pictures, and Results | 79 pages, 38 figures; additional figures plus appendix expanding on
divergence, currents, and tensor densities | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A pedagogical but concise overview of Riemannian geometry is provided, in the
context of usage in physics. The emphasis is on defining and visualizing
concepts and relationships between them, as well as listing common confusions,
alternative notations and jargon, and relevant facts and theorems. Special
attention is ... | [
{
"created": "Sun, 7 Dec 2014 20:16:38 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Dec 2014 18:33:36 GMT",
"version": "v2"
},
{
"created": "Wed, 18 May 2016 22:19:50 GMT",
"version": "v3"
},
{
"created": "Wed, 27 Feb 2019 20:28:02 GMT",
"version": "v4"
},
{
"cr... | 2022-08-19 | [
[
"Marsh",
"Adam",
""
]
] | A pedagogical but concise overview of Riemannian geometry is provided, in the context of usage in physics. The emphasis is on defining and visualizing concepts and relationships between them, as well as listing common confusions, alternative notations and jargon, and relevant facts and theorems. Special attention is gi... |
1205.0328 | Yousef Bisabr | Yousef Bisabr (Farzan-Nahad) | Modified Gravity with a Non-minimal Gravitational Coupling to Matter | 13 Pages, Two figures, Accepted for publication in Physical Review D | Phys. Rev. D 86, 044025 (2012) | 10.1103/PhysRevD.86.044025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider modified theories of gravity with a direct coupling between
matter and geometry, denoted by an arbitrary function in terms of the Ricci
scalar. Due to such a coupling, the matter stress tensor is no longer conserved
and there is an energy transfer between the two components. By solving the
conservation eq... | [
{
"created": "Wed, 2 May 2012 06:10:19 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Jul 2012 18:29:37 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Bisabr",
"Yousef",
"",
"Farzan-Nahad"
]
] | We consider modified theories of gravity with a direct coupling between matter and geometry, denoted by an arbitrary function in terms of the Ricci scalar. Due to such a coupling, the matter stress tensor is no longer conserved and there is an energy transfer between the two components. By solving the conservation equa... |
2312.16764 | F\'elix-Louis Juli\'e | F\'elix-Louis Juli\'e | Dynamical scalarization in Schwarzschild binary inspirals | 12 pages, 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Schwarzschild black hole binaries can undergo dynamical
scalarization (DS) in the inspiral phase, in a subclass of
$\mathbb{Z}_2$-symmetric Einstein-scalar-Gauss-Bonnet (ESGB) theories of
gravity. The mechanism is analogous to neutron star DS in scalar-tensor
gravity, and it differs from the late merger ... | [
{
"created": "Thu, 28 Dec 2023 01:18:18 GMT",
"version": "v1"
}
] | 2023-12-29 | [
[
"Julié",
"Félix-Louis",
""
]
] | We show that Schwarzschild black hole binaries can undergo dynamical scalarization (DS) in the inspiral phase, in a subclass of $\mathbb{Z}_2$-symmetric Einstein-scalar-Gauss-Bonnet (ESGB) theories of gravity. The mechanism is analogous to neutron star DS in scalar-tensor gravity, and it differs from the late merger an... |
2208.02237 | Alfredo Iorio | Alfredo Iorio, Boris Iveti\'c, Salvatore Mignemi, Pablo Pais | The three "layers" of graphene monolayer and their analog generalized
uncertainty principles | 32 pages, 3 figures, matches published version | Phys. Rev. D 106 (2022) 116011 | 10.1103/PhysRevD.106.116011 | null | gr-qc cond-mat.other hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that graphene, in its simplest form and settings, is a practical
table-top realization of the analog of exotic quantum gravity scenarios, which
are speculated to lead to certain generalized Heisenberg algebras. In
particular, we identify three different energy regimes (the ``layers'') where
the physics is sti... | [
{
"created": "Fri, 29 Jul 2022 14:40:16 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Dec 2022 20:48:16 GMT",
"version": "v2"
}
] | 2022-12-22 | [
[
"Iorio",
"Alfredo",
""
],
[
"Ivetić",
"Boris",
""
],
[
"Mignemi",
"Salvatore",
""
],
[
"Pais",
"Pablo",
""
]
] | We show that graphene, in its simplest form and settings, is a practical table-top realization of the analog of exotic quantum gravity scenarios, which are speculated to lead to certain generalized Heisenberg algebras. In particular, we identify three different energy regimes (the ``layers'') where the physics is still... |
gr-qc/0108046 | Jiro Soda | Jiro Soda | Branes for Relativists | 10 pages, 1 figure, Invited talk at the Meeting of Frontier of
Cosmology and Gravitation, Kyoto, Japan, 25-27 April 2001 | null | null | KUCP0190 | gr-qc | null | Recently, branes in supergravity have become an indispensable tool even for
traditional relativists. The purpose of this manuscript is to provide a
pedagogical account of the brane technology so that the relativists can use
branes in their study. The type IIA supergravity theory is mainly discussed and
other cases ar... | [
{
"created": "Sat, 18 Aug 2001 02:22:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Soda",
"Jiro",
""
]
] | Recently, branes in supergravity have become an indispensable tool even for traditional relativists. The purpose of this manuscript is to provide a pedagogical account of the brane technology so that the relativists can use branes in their study. The type IIA supergravity theory is mainly discussed and other cases are ... |
gr-qc/9805073 | David Wands | Edmund J. Copeland, Andrew R. Liddle, James E. Lidsey and David Wands | Black holes and gravitational waves in concert - a probe of superstring
cosmology | 5 pages, Latex, no figures. Awarded fifth prize in 1998 Gravity
Research Foundation Essay Competition. To appear in Gen. Rel. Grav | Gen.Rel.Grav. 30 (1998) 1711-1715 | 10.1023/A:1026658909927 | null | gr-qc | null | Two strands of observational gravitation, one the search for astrophysical
evidence of primordial black holes and the other the search for gravitational
waves, may combine to provide strong evidence in favour of cosmological models
based on superstring theory, the leading candidate for unifying gravity with
the other... | [
{
"created": "Tue, 19 May 1998 14:14:45 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Copeland",
"Edmund J.",
""
],
[
"Liddle",
"Andrew R.",
""
],
[
"Lidsey",
"James E.",
""
],
[
"Wands",
"David",
""
]
] | Two strands of observational gravitation, one the search for astrophysical evidence of primordial black holes and the other the search for gravitational waves, may combine to provide strong evidence in favour of cosmological models based on superstring theory, the leading candidate for unifying gravity with the other f... |
1004.0842 | Khireddine Nouicer | Khireddine Nouicer | Hawking radiation and thermodynamics of dynamical black holes in phantom
dominated universe | 22 pages,3 figures | Class.Quant.Grav.28:015005,2011 | 10.1088/0264-9381/28/1/015005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermodynamic properties of dark energy-dominated universe in the
presence of a black hole are investigated in the general case of a varying
equation-of-state-parameter $w(a)$. We show that all the thermodynamics
quantities are regular at the phantom divide crossing, and particularly the
temperature and the entro... | [
{
"created": "Tue, 6 Apr 2010 12:53:56 GMT",
"version": "v1"
}
] | 2015-03-14 | [
[
"Nouicer",
"Khireddine",
""
]
] | The thermodynamic properties of dark energy-dominated universe in the presence of a black hole are investigated in the general case of a varying equation-of-state-parameter $w(a)$. We show that all the thermodynamics quantities are regular at the phantom divide crossing, and particularly the temperature and the entropy... |
1711.08329 | Shulei Cao | Shu-Lei Cao, Song Li, Hao-Ran Yu, Tong-Jie Zhang | Statefinder diagnostic and constraints on the Palatini f(R) gravity
theories | 19 pages, 10 figures, arXiv admin note: text overlap with
arXiv:1002.3867 | RAA 2018 Vol. 18 No.3, 26(16pp) | 10.1088/1674-4527/18/3/26 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We focus on a series of $f(R)$ gravity theories in Palatini formalism to
investigate the probabilities of producing the late-time acceleration for the
flat Friedmann-Robertson-Walker (FRW) universe. We apply statefinder diagnostic
to these cosmological models for chosen series of parameters to see if they
distinguish... | [
{
"created": "Mon, 20 Nov 2017 19:43:56 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Mar 2018 12:12:35 GMT",
"version": "v2"
}
] | 2020-05-27 | [
[
"Cao",
"Shu-Lei",
""
],
[
"Li",
"Song",
""
],
[
"Yu",
"Hao-Ran",
""
],
[
"Zhang",
"Tong-Jie",
""
]
] | We focus on a series of $f(R)$ gravity theories in Palatini formalism to investigate the probabilities of producing the late-time acceleration for the flat Friedmann-Robertson-Walker (FRW) universe. We apply statefinder diagnostic to these cosmological models for chosen series of parameters to see if they distinguish f... |
gr-qc/9809069 | Iosif B. Khriplovich | I.B. Khriplovich and A.A. Pomeransky | Equations of Motion of Spinning Relativistic Particle in Electromagnetic
and Gravitational Fields | 32 pages, latex, Plenary talk at the Fairbank Meeting on the
Lense--Thirring Effect, Rome-Pescara, 29/6-4/7 1998 | Surveys High Energ.Phys.14:145-173,1999 | 10.1080/01422419908228843 | null | gr-qc hep-th physics.acc-ph | null | We consider the motion of a spinning relativistic particle in external
electromagnetic and gravitational fields, to first order in the external field,
but to an arbitrary order in spin. The noncovariant spin formalism is crucial
for the correct description of the influence of the spin on the particle
trajectory. We s... | [
{
"created": "Thu, 24 Sep 1998 08:50:27 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Khriplovich",
"I. B.",
""
],
[
"Pomeransky",
"A. A.",
""
]
] | We consider the motion of a spinning relativistic particle in external electromagnetic and gravitational fields, to first order in the external field, but to an arbitrary order in spin. The noncovariant spin formalism is crucial for the correct description of the influence of the spin on the particle trajectory. We sho... |
2405.07455 | Denis C. Rodrigues | Carlos F. S. Pereira, \'Ebano L. Martins, Denis C. Rodrigues, J\'ulio
C. Fabris, Manuel E. Rodrigues | New sources of ghost fields in $k$-essence theories for black-bounce
solutions | 25 pages, 7 figures | null | null | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | In the present study, we generalize the possible ghost field configurations
within the framework of $k$-essence theory to the Simpson-Visser metric area
function $\Sigma^2=x^2+a^2$. Our analysis encompasses field configurations for
the region-defined metric function $dA_\pm$ as well as the general solution
that asymp... | [
{
"created": "Mon, 13 May 2024 04:08:18 GMT",
"version": "v1"
}
] | 2024-05-15 | [
[
"Pereira",
"Carlos F. S.",
""
],
[
"Martins",
"Ébano L.",
""
],
[
"Rodrigues",
"Denis C.",
""
],
[
"Fabris",
"Júlio C.",
""
],
[
"Rodrigues",
"Manuel E.",
""
]
] | In the present study, we generalize the possible ghost field configurations within the framework of $k$-essence theory to the Simpson-Visser metric area function $\Sigma^2=x^2+a^2$. Our analysis encompasses field configurations for the region-defined metric function $dA_\pm$ as well as the general solution that asympto... |
gr-qc/0211025 | Norbert Van den Bergh | N. Van den Bergh | Purely gravito-magnetic vacuum space-times | 4 pages | Class.Quant.Grav. 20 (2003) L1-L4 | 10.1088/0264-9381/20/1/101 | null | gr-qc | null | It is shown that there are no vacuum space-times (with or without
cosmological constant) for which the Weyl-tensor is purely gravito-magnetic
with respect to a normal and timelike congruence of observers.
| [
{
"created": "Thu, 7 Nov 2002 14:21:18 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Bergh",
"N. Van den",
""
]
] | It is shown that there are no vacuum space-times (with or without cosmological constant) for which the Weyl-tensor is purely gravito-magnetic with respect to a normal and timelike congruence of observers. |
1203.5138 | Piotr T. Chru\'sciel | Piotr T. Chru\'sciel, Rafe Mazzeo, Samuel Pocchiola | Initial data sets with ends of cylindrical type: II. The vector
constraint equation | null | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct solutions of the vacuum vector constraint equations on manifolds
with cylindrical ends.
| [
{
"created": "Thu, 22 Mar 2012 22:03:37 GMT",
"version": "v1"
}
] | 2012-03-26 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Mazzeo",
"Rafe",
""
],
[
"Pocchiola",
"Samuel",
""
]
] | We construct solutions of the vacuum vector constraint equations on manifolds with cylindrical ends. |
0709.2433 | Hanno Sahlmann | Hanno Sahlmann | Toward explaining black hole entropy quantization in loop quantum
gravity | 15 pages, 5 figures. v3: final version (essentially as it appeared in
PRD) | Phys.Rev.D76:104050,2007 | 10.1103/PhysRevD.76.104050 | ITP-UU-07/46, SPIN-07/34 | gr-qc hep-th math-ph math.MP | null | In a remarkable numerical analysis of the spectrum of states for a
spherically symmetric black hole in loop quantum gravity, Corichi, Diaz-Polo
and Fernandez-Borja found that the entropy of the black hole horizon increases
in what resembles discrete steps as a function of area. In the present article
we reformulate t... | [
{
"created": "Sat, 15 Sep 2007 15:52:52 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Sep 2007 18:31:08 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Nov 2007 15:27:20 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Sahlmann",
"Hanno",
""
]
] | In a remarkable numerical analysis of the spectrum of states for a spherically symmetric black hole in loop quantum gravity, Corichi, Diaz-Polo and Fernandez-Borja found that the entropy of the black hole horizon increases in what resembles discrete steps as a function of area. In the present article we reformulate the... |
2204.05960 | Djeyrane-Sophie Erfani | Djeyrane-Sophie Erfani | Bondi news in de Sitter space-time | Submitted for publication in PRD | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Observations have shown that a model with a positive cosmological constant is
more appropriate to describe our universe. The aim of this manuscript is to
study the gravitational fields in de Sitter space-time. To achieve this goal,
de Sitter metric is written in Bondi Sachs form and the Einstein equations are
solved ... | [
{
"created": "Tue, 12 Apr 2022 17:22:07 GMT",
"version": "v1"
}
] | 2022-04-13 | [
[
"Erfani",
"Djeyrane-Sophie",
""
]
] | Observations have shown that a model with a positive cosmological constant is more appropriate to describe our universe. The aim of this manuscript is to study the gravitational fields in de Sitter space-time. To achieve this goal, de Sitter metric is written in Bondi Sachs form and the Einstein equations are solved fo... |
1609.01733 | Joseph Keir | Joseph Keir | Wave propagation on microstate geometries | Final version, accepted for publication in Annales Henri Poincare | null | null | null | gr-qc hep-th math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetric microstate geometries were recently conjectured to be
nonlinearly unstable due to numerical and heuristic evidence, based on the
existence of very slowly decaying solutions to the linear wave equation on
these backgrounds. In this paper, we give a thorough mathematical treatment of
the linear wave equa... | [
{
"created": "Tue, 6 Sep 2016 20:01:07 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Dec 2019 22:01:28 GMT",
"version": "v2"
}
] | 2019-12-16 | [
[
"Keir",
"Joseph",
""
]
] | Supersymmetric microstate geometries were recently conjectured to be nonlinearly unstable due to numerical and heuristic evidence, based on the existence of very slowly decaying solutions to the linear wave equation on these backgrounds. In this paper, we give a thorough mathematical treatment of the linear wave equati... |
1505.05952 | Elena P. Savelova Dr. | A. A. Kirillov, E. P. Savelova | On scattering of CMB radiation on wormholes: kinetic SZ-effect | report at 14th Marcel Grossmann Meeting (Rome 2015) | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of scattering of CMB radiation on wormholes is considered. It is
shown that a static gas of wormholes does not perturb the spectrum of CMB. In
the first order by $v/c$ the presence of peculiar velocities gives rise to the
dipole contribution in $\Delta T/T$, which corresponds to the well-known
kinetic Sun... | [
{
"created": "Fri, 22 May 2015 05:11:13 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Dec 2015 06:34:07 GMT",
"version": "v2"
}
] | 2015-12-04 | [
[
"Kirillov",
"A. A.",
""
],
[
"Savelova",
"E. P.",
""
]
] | The problem of scattering of CMB radiation on wormholes is considered. It is shown that a static gas of wormholes does not perturb the spectrum of CMB. In the first order by $v/c$ the presence of peculiar velocities gives rise to the dipole contribution in $\Delta T/T$, which corresponds to the well-known kinetic Sunya... |
1702.04637 | Tahir Hussain | Sumaira Saleem Akhtar, Tahir Hussain, Ashfaque Hussain Bokhari and
Fawad Khan | Conformal Collineations of the Ricci and Energy-Momentum Tensors in
Static Plane Symmetric Spacetimes | 23 pages. arXiv admin note: text overlap with arXiv:1701.06900 | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the degenerate and non-degenerate cases, we provide a complete
classification of static plane symmetric spacetimes according to conformal
Ricci collineations (CRCs) and conformal matter collineations (CMCs). In case
of non-degenerate Ricci tensor, a general form of vector field generating CRCs
is found in... | [
{
"created": "Sun, 12 Feb 2017 08:45:13 GMT",
"version": "v1"
}
] | 2019-03-20 | [
[
"Akhtar",
"Sumaira Saleem",
""
],
[
"Hussain",
"Tahir",
""
],
[
"Bokhari",
"Ashfaque Hussain",
""
],
[
"Khan",
"Fawad",
""
]
] | Considering the degenerate and non-degenerate cases, we provide a complete classification of static plane symmetric spacetimes according to conformal Ricci collineations (CRCs) and conformal matter collineations (CMCs). In case of non-degenerate Ricci tensor, a general form of vector field generating CRCs is found in t... |
2111.00833 | Alex Kolmus | Alex Kolmus, Gr\'egory Baltus, Justin Janquart, Twan van Laarhoven,
Sarah Caudill, and Tom Heskes | Swift sky localization of gravitational waves using deep learning seeded
importance sampling | 12 pages, 9 figures, 1 table | null | 10.1103/PhysRevD.106.023032 | null | gr-qc astro-ph.IM cs.LG | http://creativecommons.org/licenses/by/4.0/ | Fast, highly accurate, and reliable inference of the sky origin of
gravitational waves would enable real-time multi-messenger astronomy. Current
Bayesian inference methodologies, although highly accurate and reliable, are
slow. Deep learning models have shown themselves to be accurate and extremely
fast for inference... | [
{
"created": "Mon, 1 Nov 2021 11:05:08 GMT",
"version": "v1"
}
] | 2022-08-17 | [
[
"Kolmus",
"Alex",
""
],
[
"Baltus",
"Grégory",
""
],
[
"Janquart",
"Justin",
""
],
[
"van Laarhoven",
"Twan",
""
],
[
"Caudill",
"Sarah",
""
],
[
"Heskes",
"Tom",
""
]
] | Fast, highly accurate, and reliable inference of the sky origin of gravitational waves would enable real-time multi-messenger astronomy. Current Bayesian inference methodologies, although highly accurate and reliable, are slow. Deep learning models have shown themselves to be accurate and extremely fast for inference t... |
1312.5689 | Soham Pal | Soham Pal (ISU), Karthik Rajeev (IISER-TVM), S. Shankaranarayanan
(IISER-TVM) | An approach to the quantization of black-hole quasi-normal modes | 22 pages, converted from double column to single column | IJMPD Vol 24, No.13 (2015) 1550083 (21 pages) | 10.1142/S0218271815500832 | null | gr-qc cond-mat.stat-mech hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we derive the asymptotic quasi-normal modes of a BTZ black hole
using a quantum field theoretic Lagrangian. The BTZ black hole is a very
popular system in the context of $2+1$-dimensional quantum gravity. However to
our knowledge the quasi-normal modes of the BTZ black hole have been studied
only in the ... | [
{
"created": "Thu, 19 Dec 2013 18:37:57 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Sep 2015 12:16:01 GMT",
"version": "v2"
}
] | 2015-09-22 | [
[
"Pal",
"Soham",
"",
"ISU"
],
[
"Rajeev",
"Karthik",
"",
"IISER-TVM"
],
[
"Shankaranarayanan",
"S.",
"",
"IISER-TVM"
]
] | In this work we derive the asymptotic quasi-normal modes of a BTZ black hole using a quantum field theoretic Lagrangian. The BTZ black hole is a very popular system in the context of $2+1$-dimensional quantum gravity. However to our knowledge the quasi-normal modes of the BTZ black hole have been studied only in the cl... |
1905.08177 | Israel Quiros | Israel Quiros, Roberto De Arcia, Ricardo Garc\'ia-Salcedo, Tame
Gonzalez, Francisco Antonio Horta-Rangel | An issue with the classification of the scalar-tensor theories of
gravity | 22 pages, no figures. Version that matches the one accepted by the
IJMPD. arXiv admin note: substantial text overlap with arXiv:1901.08690 | null | 10.1142/S0218271820500479 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the bibliography a certain confusion arises in what regards to the
classification of the gravitational theories into scalar-tensor theories and
general relativity with a scalar field either minimally or non-minimally
coupled to matter. Higher-derivatives Horndeski and beyond Horndeski theories
that at first sight ... | [
{
"created": "Mon, 20 May 2019 15:43:09 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2019 14:22:17 GMT",
"version": "v2"
},
{
"created": "Sun, 4 Aug 2019 01:39:12 GMT",
"version": "v3"
},
{
"created": "Tue, 17 Mar 2020 03:32:12 GMT",
"version": "v4"
}
] | 2020-04-27 | [
[
"Quiros",
"Israel",
""
],
[
"De Arcia",
"Roberto",
""
],
[
"García-Salcedo",
"Ricardo",
""
],
[
"Gonzalez",
"Tame",
""
],
[
"Horta-Rangel",
"Francisco Antonio",
""
]
] | In the bibliography a certain confusion arises in what regards to the classification of the gravitational theories into scalar-tensor theories and general relativity with a scalar field either minimally or non-minimally coupled to matter. Higher-derivatives Horndeski and beyond Horndeski theories that at first sight do... |
1510.00069 | Branislav Cvetkovi\'c | Milutin Blagojevi\'c and Branislav Cvetkovi\'c | Conformally flat black holes in Poincar\'e gauge theory | LATEX, 17 pages; v2 minor revisions | Phys. Rev. D 93, 044018 (2016) | 10.1103/PhysRevD.93.044018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General criteria for the existence of conformally flat Riemannian solutions
in 3D Poincar\'e gauge theory without matter are formulated. Using these
criteria, we show that the Oliva-Tempo-Troncoso black hole, a solution of the
Bergshoeff-Hohm-Town\-send gravity, is also an exact vacuum solution of the
Poincar\'e gaug... | [
{
"created": "Wed, 30 Sep 2015 22:55:15 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Feb 2016 12:48:48 GMT",
"version": "v2"
}
] | 2016-02-15 | [
[
"Blagojević",
"Milutin",
""
],
[
"Cvetković",
"Branislav",
""
]
] | General criteria for the existence of conformally flat Riemannian solutions in 3D Poincar\'e gauge theory without matter are formulated. Using these criteria, we show that the Oliva-Tempo-Troncoso black hole, a solution of the Bergshoeff-Hohm-Town\-send gravity, is also an exact vacuum solution of the Poincar\'e gauge ... |
2110.05180 | Timothy Andersen | Timothy D. Andersen | Chaotic deterministic quantization in a 5D general relativity | null | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | How to quantize gravity is a major outstanding open question in quantum
physics. While many approaches assume Einstein's theory is an effective
low-energy theory, another possibility is that standard methods of quantization
are the problem. In this paper, I analyze a quantization mechanism based on
chaotic dynamics o... | [
{
"created": "Mon, 11 Oct 2021 15:15:54 GMT",
"version": "v1"
}
] | 2021-10-12 | [
[
"Andersen",
"Timothy D.",
""
]
] | How to quantize gravity is a major outstanding open question in quantum physics. While many approaches assume Einstein's theory is an effective low-energy theory, another possibility is that standard methods of quantization are the problem. In this paper, I analyze a quantization mechanism based on chaotic dynamics of ... |
1611.08291 | Abhay Shah | Abhay G. Shah, Bernard F. Whiting, Steffen Aksteiner, Lars Andersson,
Thomas B\"ackdahl | Gauge-invariant perturbations of Schwarzschild spacetime | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study perturbations of Schwarzschild spacetime in a coordinate-free,
covariant form. The GHP formulation, having the advantage of not only being
covariant but also tetrad-rotation invariant, is used to write down the
previously known odd- and even-parity gauge-invariants and the equations they
satisfy. Additionall... | [
{
"created": "Thu, 24 Nov 2016 19:20:53 GMT",
"version": "v1"
}
] | 2016-11-29 | [
[
"Shah",
"Abhay G.",
""
],
[
"Whiting",
"Bernard F.",
""
],
[
"Aksteiner",
"Steffen",
""
],
[
"Andersson",
"Lars",
""
],
[
"Bäckdahl",
"Thomas",
""
]
] | We study perturbations of Schwarzschild spacetime in a coordinate-free, covariant form. The GHP formulation, having the advantage of not only being covariant but also tetrad-rotation invariant, is used to write down the previously known odd- and even-parity gauge-invariants and the equations they satisfy. Additionally,... |
gr-qc/9411056 | Ulvi Yurtsever | Ulvi Yurtsever | The averaged null energy condition and difference inequalities in
quantum field theory | 20 pages | Phys.Rev. D51 (1995) 5797-5805 | 10.1103/PhysRevD.51.5797 | null | gr-qc | null | Recently, Larry Ford and Tom Roman have discovered that in a flat cylindrical
space, although the stress-energy tensor itself fails to satisfy the averaged
null energy condition (ANEC) along the (non-achronal) null geodesics, when the
``Casimir-vacuum" contribution is subtracted from the stress-energy the
resulting t... | [
{
"created": "Mon, 21 Nov 1994 23:56:11 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Yurtsever",
"Ulvi",
""
]
] | Recently, Larry Ford and Tom Roman have discovered that in a flat cylindrical space, although the stress-energy tensor itself fails to satisfy the averaged null energy condition (ANEC) along the (non-achronal) null geodesics, when the ``Casimir-vacuum" contribution is subtracted from the stress-energy the resulting ten... |
gr-qc/0202054 | Bahram Mashhoon | C. Chicone and B. Mashhoon | Acceleration-Induced Nonlocality: Uniqueness of the Kernel | LaTeX file, 2 figures, 14 pages | Phys.Lett. A298 (2002) 229-235 | 10.1016/S0375-9601(02)00439-5 | null | gr-qc | null | We consider the problem of uniqueness of the kernel in the nonlocal theory of
accelerated observers. In a recent work, we showed that the convolution kernel
is ruled out as it can lead to divergences for nonuniform accelerated motion.
Here we determine the general form of bounded continuous kernels and use
observatio... | [
{
"created": "Thu, 14 Feb 2002 23:03:34 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Chicone",
"C.",
""
],
[
"Mashhoon",
"B.",
""
]
] | We consider the problem of uniqueness of the kernel in the nonlocal theory of accelerated observers. In a recent work, we showed that the convolution kernel is ruled out as it can lead to divergences for nonuniform accelerated motion. Here we determine the general form of bounded continuous kernels and use observationa... |
gr-qc/9308016 | Bev Berger | Beverly K. Berger | How to determine approximate Mixmaster parameters from numerical
evolution of Einstein's equations | 11 pages in revtex | Phys.Rev. D49 (1994) 1120-1123 | 10.1103/PhysRevD.49.1120 | null | gr-qc | null | To assess the validity of the Belinskii, Khalatnikov, and Lifshitz (BKL)
approximation to Mixmaster dynamics, it would be useful to evaluate the BKL
discrete parameters as a byproduct of the numerical solution of Einstein's
equations. An algorithm to do this and results for a typical trajectory are
presented.
| [
{
"created": "Tue, 17 Aug 1993 20:58:23 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Berger",
"Beverly K.",
""
]
] | To assess the validity of the Belinskii, Khalatnikov, and Lifshitz (BKL) approximation to Mixmaster dynamics, it would be useful to evaluate the BKL discrete parameters as a byproduct of the numerical solution of Einstein's equations. An algorithm to do this and results for a typical trajectory are presented. |
gr-qc/9504015 | Simon Frederick Ross | R.B. Mann and S.F. Ross | Cosmological production of charged black hole pairs | 29 pages, latex, 3 figures in a seperate uuencoded compressed file.
Discussion of the significance of the instantons enlarged, and minor
emendations | Phys.Rev.D52:2254-2265,1995 | 10.1103/PhysRevD.52.2254 | DAMTP/R-95/9 | gr-qc hep-th | null | We investigate the pair creation of charged black holes in a background with
a positive cosmological constant. We consider $C$ metrics with a cosmological
constant, and show that the conical singularities in the metric only disappear
when it reduces to the Reissner-Nordstr\"om de Sitter metric. We construct an
instan... | [
{
"created": "Mon, 10 Apr 1995 15:47:55 GMT",
"version": "v1"
},
{
"created": "Fri, 12 May 1995 09:38:49 GMT",
"version": "v2"
}
] | 2011-05-05 | [
[
"Mann",
"R. B.",
""
],
[
"Ross",
"S. F.",
""
]
] | We investigate the pair creation of charged black holes in a background with a positive cosmological constant. We consider $C$ metrics with a cosmological constant, and show that the conical singularities in the metric only disappear when it reduces to the Reissner-Nordstr\"om de Sitter metric. We construct an instanto... |
1304.1960 | James Isenberg | James Isenberg | Initial Value Problem in General Relativity | To appear as a chapter in "The Springer Handbook of Spacetime,"
edited by A. Ashtekar and V. Petkov. (Springer-Verlag, at Press) | null | 10.1007/978-3-642-41992-8_16 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article, written to appear as a chapter in "The Springer Handbook of
Spacetime", is a review of the initial value problem for Einstein's
gravitational field theory in general relativity. Designed to be accessible to
graduate students who have taken a first course in general relativity, the
article first discusse... | [
{
"created": "Sun, 7 Apr 2013 06:08:04 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Isenberg",
"James",
""
]
] | This article, written to appear as a chapter in "The Springer Handbook of Spacetime", is a review of the initial value problem for Einstein's gravitational field theory in general relativity. Designed to be accessible to graduate students who have taken a first course in general relativity, the article first discusses ... |
0704.2403 | Fernando Schwartz | Fernando Schwartz | Existence of outermost apparent horizons with product of spheres
topology | Replaced by revised version. Improvements in exposition and simpler
proofs. 3 figures added | Commun. Anal. Geom.16:799-817, 2008 | null | null | gr-qc hep-th math.DG | null | In this paper we find new examples of Riemannian manifolds with outermost
apparent horizons with nonspherical topology, in dimensions four and above.
More precisely, for any $n,m\ge1$, we construct asymptotically flat, scalar
flat Riemannian manifolds containing smooth outermost minimal hypersurfaces
with topology $S... | [
{
"created": "Wed, 18 Apr 2007 18:50:45 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Oct 2007 01:48:27 GMT",
"version": "v2"
}
] | 2011-07-13 | [
[
"Schwartz",
"Fernando",
""
]
] | In this paper we find new examples of Riemannian manifolds with outermost apparent horizons with nonspherical topology, in dimensions four and above. More precisely, for any $n,m\ge1$, we construct asymptotically flat, scalar flat Riemannian manifolds containing smooth outermost minimal hypersurfaces with topology $S^n... |
1709.07845 | Gianluca Calcagni | Gianluca Calcagni | Detecting quantum gravity in the sky | 4 pages, 1 figure. In Proceedings of EPS-HEP 2017, European Physical
Society conference on High Energy Physics, July 5-12, 2017, Venice, Italy.
v2: minor corrections to match the published version
(https://pos.sissa.it/314/033/) | PoS(EPS-HEP2017)033 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Getting signatures of quantum gravity is one of the topical lines of research
in modern theoretical physics and cosmology. This short review faces this
challenge under a novel perspective. Instead of separating quantum-gravity
effects of a specific model between UV and IR regimes, we consider a general
feature, possi... | [
{
"created": "Fri, 22 Sep 2017 17:02:24 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2017 19:42:48 GMT",
"version": "v2"
}
] | 2017-10-24 | [
[
"Calcagni",
"Gianluca",
""
]
] | Getting signatures of quantum gravity is one of the topical lines of research in modern theoretical physics and cosmology. This short review faces this challenge under a novel perspective. Instead of separating quantum-gravity effects of a specific model between UV and IR regimes, we consider a general feature, possibl... |
gr-qc/0604107 | Jan Broekaert | Jan (B.) Broekaert | A Lorentz-Poincar\'e type interpretation of the Weak Equivalence
Principle | v1: 9 pages, 2 figures, v2: version to appear in International
Journal of Theoretical Physics | Int.J.Theor.Phys.46:1722-1737,2007 | 10.1007/s10773-006-9304-z | null | gr-qc | null | The validity of the Weak Equivalence Principle relative to a local inertial
frame is detailed in a scalar-vector gravitation model with Lorentz-Poincar\'e
type interpretation. Given the previously established first Post-Newtonian
concordance of dynamics with General Relativity, the principle is to this order
compatib... | [
{
"created": "Tue, 25 Apr 2006 13:17:59 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Mar 2007 16:58:20 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Mar 2007 20:24:01 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Jan",
"",
"",
"B."
],
[
"Broekaert",
"",
""
]
] | The validity of the Weak Equivalence Principle relative to a local inertial frame is detailed in a scalar-vector gravitation model with Lorentz-Poincar\'e type interpretation. Given the previously established first Post-Newtonian concordance of dynamics with General Relativity, the principle is to this order compatible... |
1907.08890 | Norihiro Tanahashi | Tsuyoshi Houri, Norihiro Tanahashi and Yukinori Yasui | Separability of Maxwell equation in rotating black hole spacetime and
its geometric aspects | 10 pages. Proceedings for the 11th MSJ-SI "The Role of Metrics in the
Theory of Partial Differential Equations"; accepted for publication in
Advanced Studies in Pure Mathematics | Advanced Studies in Pure Mathematics Vol. 85, 407-416 (2020) | 10.2969/aspm/08510407 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently a new formalism for perturbations of Maxwell's equations on the
background of the Kerr-NUT-(A)dS spacetime was proposed, with which the
equations are reduced to a equation of motion of a scalar field that can be
solved by separation of variables. In this formalism the differential operators
that commute with... | [
{
"created": "Sun, 21 Jul 2019 01:21:33 GMT",
"version": "v1"
}
] | 2021-03-05 | [
[
"Houri",
"Tsuyoshi",
""
],
[
"Tanahashi",
"Norihiro",
""
],
[
"Yasui",
"Yukinori",
""
]
] | Recently a new formalism for perturbations of Maxwell's equations on the background of the Kerr-NUT-(A)dS spacetime was proposed, with which the equations are reduced to a equation of motion of a scalar field that can be solved by separation of variables. In this formalism the differential operators that commute with t... |
1712.03236 | Jose' P. S. Lemos | Jos\'e P. S. Lemos, Oleg B. Zaslavskii | Black hole mass formula in the membrane paradigm | 27 pages, no figures. The revised version emphasizes the novelty of
the result within the membrane paradigm. Other minor corrections | Phys. Rev. D 97, 064008 (2018) | 10.1103/PhysRevD.97.064008 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The membrane paradigm approach adopts a timelike surface, stretched out off
the null event horizon, to study several important black hole properties. We
use this powerful tool to give a direct derivation of the black hole mass
formula in the static and stationary cases without and with electric field.
Since here the ... | [
{
"created": "Fri, 8 Dec 2017 19:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Mar 2018 18:55:55 GMT",
"version": "v2"
}
] | 2018-03-28 | [
[
"Lemos",
"José P. S.",
""
],
[
"Zaslavskii",
"Oleg B.",
""
]
] | The membrane paradigm approach adopts a timelike surface, stretched out off the null event horizon, to study several important black hole properties. We use this powerful tool to give a direct derivation of the black hole mass formula in the static and stationary cases without and with electric field. Since here the me... |
2307.16194 | Jafar Khodagholizadeh | Jafar Khodagholizadeh, Rohoollah Mohammadi and S. M. S. Movahed | CMB Polarization by the Asymmetric Template of Scalar Perturbations | 20 pages, 2 figures | Eur. Phys. J. C 83, 651 (2023) | 10.1140/epjc/s10052-023-11820-4 | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | Inspired by a dipole asymmetric template for the CMB temperature map in the
primordial scalar fluctuations observed by Planck at a large scale, we examine
the contribution of a similar template for power asymmetry in modifying the
linear polarization pattern of CMB. Replacing un-modulated temperature
fluctuation with... | [
{
"created": "Sun, 30 Jul 2023 10:21:14 GMT",
"version": "v1"
}
] | 2023-08-01 | [
[
"Khodagholizadeh",
"Jafar",
""
],
[
"Mohammadi",
"Rohoollah",
""
],
[
"Movahed",
"S. M. S.",
""
]
] | Inspired by a dipole asymmetric template for the CMB temperature map in the primordial scalar fluctuations observed by Planck at a large scale, we examine the contribution of a similar template for power asymmetry in modifying the linear polarization pattern of CMB. Replacing un-modulated temperature fluctuation with d... |
0705.4370 | Jacek Jezierski | Jacek Jezierski | Asymptotic conformal Yano-Killing tensors for asymptotic anti-de Sitter
spacetimes and conserved quantities | 38 pages | Acta Phys.Polon.B39:75-114,2008 | null | null | gr-qc | null | Conformal rescaling of conformal Yano--Killing tensors and relations between
Yano and CYK tensors are discussed. Pullback of these objects to a submanifold
is used to construct all solutions of a CYK equation in anti-de Sitter and de
Sitter spacetimes. Properties of asymptotic conformal Yano--Killing tensors are
exam... | [
{
"created": "Wed, 30 May 2007 11:48:53 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Jezierski",
"Jacek",
""
]
] | Conformal rescaling of conformal Yano--Killing tensors and relations between Yano and CYK tensors are discussed. Pullback of these objects to a submanifold is used to construct all solutions of a CYK equation in anti-de Sitter and de Sitter spacetimes. Properties of asymptotic conformal Yano--Killing tensors are examin... |
1811.01018 | Ali Dehghani | Seyed Hossein Hendi and Ali Dehghani | Criticality and extended phase space thermodynamics of AdS black holes
in higher curvature massive gravity | 36 pages, 22 Figures | Eur. Phys. J. C 79, 227 (2019) | 10.1140/epjc/s10052-019-6743-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering de Rham-Gabadadze-Tolley theory of massive gravity coupled with
(ghost free) higher curvature terms arisen from the Lovelock Lagrangian, we
obtain charged AdS black hole solutions in diverse dimensions. We compute
thermodynamic quantities in the extended phase space by considering the
variations of the ne... | [
{
"created": "Fri, 2 Nov 2018 04:25:19 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Nov 2018 13:42:11 GMT",
"version": "v2"
}
] | 2020-04-28 | [
[
"Hendi",
"Seyed Hossein",
""
],
[
"Dehghani",
"Ali",
""
]
] | Considering de Rham-Gabadadze-Tolley theory of massive gravity coupled with (ghost free) higher curvature terms arisen from the Lovelock Lagrangian, we obtain charged AdS black hole solutions in diverse dimensions. We compute thermodynamic quantities in the extended phase space by considering the variations of the nega... |
gr-qc/9803010 | Malcolm MacCallum | Piotr T. Chru\'sciel, Jacek Jezierski and Malcolm A.H. MacCallum | Uniqueness of the Trautman--Bondi mass | latex, 33 pages | Phys.Rev.D58:084001,1998 | 10.1103/PhysRevD.58.084001 | null | gr-qc | null | It is shown that the only functionals, within a natural class, which are
monotonic in time for all solutions of the vacuum Einstein equations admitting
a smooth ``piece'' of conformal null infinity Scri, are those depending on the
metric only through a specific combination of the Bondi `mass aspect' and other
next--t... | [
{
"created": "Mon, 2 Mar 1998 12:38:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Jezierski",
"Jacek",
""
],
[
"MacCallum",
"Malcolm A. H.",
""
]
] | It is shown that the only functionals, within a natural class, which are monotonic in time for all solutions of the vacuum Einstein equations admitting a smooth ``piece'' of conformal null infinity Scri, are those depending on the metric only through a specific combination of the Bondi `mass aspect' and other next--to-... |
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