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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0409109 | Patricio S. Letelier | D. Vogt and P. S. Letelier | A General Relativistic Model for the Gravitational Field of Active
Galactic Nuclei Surrounded by a Disk | 24 pages, LATEX. Phys. Rev. D (in press) | Phys.Rev. D71 (2005) 044009 | 10.1103/PhysRevD.71.044009 | null | gr-qc astro-ph | null | An exact but simple general relativistic model for the gravitational field of
active galactic nuclei is constructed, based on the superposition in Weyl
coordinates of a black hole, a Chazy-Curzon disk and two rods, which represent
matter jets. The influence of the rods on the matter properties of the disk and
on its ... | [
{
"created": "Tue, 28 Sep 2004 17:35:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Vogt",
"D.",
""
],
[
"Letelier",
"P. S.",
""
]
] | An exact but simple general relativistic model for the gravitational field of active galactic nuclei is constructed, based on the superposition in Weyl coordinates of a black hole, a Chazy-Curzon disk and two rods, which represent matter jets. The influence of the rods on the matter properties of the disk and on its st... |
2210.15620 | Ahmad Al-Badawi | Ahmad Al-Badawi | The Dirac and Klein-Gordon equations and Greybody Radiation for the
Regular Hayward Black Hole | null | Canadian Journal of Physics, 2022 | 10.1139/cjp-2022-0075 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Dirac and Klein-Gordon equations, as well as greybody
radiation, for the Hayward black hole (BH) spacetime. We first consider the
Dirac equation using a null tetrad in the Newman- Penrose (NP) formalism. The
equations are then separated into angular and radial parts. A pair of
one-dimensional Schr\... | [
{
"created": "Sun, 23 Oct 2022 08:33:07 GMT",
"version": "v1"
}
] | 2022-10-28 | [
[
"Al-Badawi",
"Ahmad",
""
]
] | We investigate the Dirac and Klein-Gordon equations, as well as greybody radiation, for the Hayward black hole (BH) spacetime. We first consider the Dirac equation using a null tetrad in the Newman- Penrose (NP) formalism. The equations are then separated into angular and radial parts. A pair of one-dimensional Schr\"o... |
1509.04129 | Valerio Faraoni | Valerio Faraoni, Angus Prain, and Andres F. Zambrano Moreno (Bishop's
University) | Black holes and wormholes subject to conformal mappings | 7 pages, 2 figures | Phys. Rev. D 93, 024005 (2016) | 10.1103/PhysRevD.93.024005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solutions of the field equations of theories of gravity which admit distinct
conformal frame representations can look very different in these frames. We
show that Brans class IV solutions describe wormholes in the Jordan frame (in a
certain parameter range) but correspond to horizonless geometries in the
Einstein fra... | [
{
"created": "Mon, 14 Sep 2015 15:09:05 GMT",
"version": "v1"
}
] | 2016-01-13 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's\n University"
],
[
"Prain",
"Angus",
"",
"Bishop's\n University"
],
[
"Moreno",
"Andres F. Zambrano",
"",
"Bishop's\n University"
]
] | Solutions of the field equations of theories of gravity which admit distinct conformal frame representations can look very different in these frames. We show that Brans class IV solutions describe wormholes in the Jordan frame (in a certain parameter range) but correspond to horizonless geometries in the Einstein frame... |
gr-qc/0009030 | S. Mignemi | S.Alexeyev, S.Mignemi | Black Holes and Naked Singularities in Low Energy Limit of String
Gravity with Modulus Field | more details are added and some misprint are corrected | Class.Quant.Grav. 18 (2001) 4165-4178 | 10.1088/0264-9381/18/20/301 | INFNCA-TH0015 | gr-qc | null | We show that the black hole solutions of the effective string theory action,
where one-loop effects that couple the moduli to gravity via a Gauss-Bonnet
term are taken into account, admit primary scalar hair. The requirement of
absence of naked singularities imposes an upper bound on the scalar charges.
| [
{
"created": "Mon, 11 Sep 2000 11:27:57 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Mar 2001 12:11:14 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Alexeyev",
"S.",
""
],
[
"Mignemi",
"S.",
""
]
] | We show that the black hole solutions of the effective string theory action, where one-loop effects that couple the moduli to gravity via a Gauss-Bonnet term are taken into account, admit primary scalar hair. The requirement of absence of naked singularities imposes an upper bound on the scalar charges. |
1105.0459 | Marcelo Salgado | Cesar Merlin and Marcelo Salgado | The gravitational light shift and the Sachs-Wolfe effect | 8 pages; accepted for publication in General Relativity and
Gravitation | Gen.Rel.Grav.43:2701-2712,2011 | 10.1007/s10714-011-1193-7 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a 3+1 decomposition of spacetime, we derive a new formula to compute
the gravitational light shifts as measured by two observers which are normal to
the spacelike hypersurfaces defining the foliation. This formula is quite
general and is also independent of the existence of Killing fields. Known
examples are co... | [
{
"created": "Tue, 3 May 2011 00:12:15 GMT",
"version": "v1"
}
] | 2011-09-28 | [
[
"Merlin",
"Cesar",
""
],
[
"Salgado",
"Marcelo",
""
]
] | Using a 3+1 decomposition of spacetime, we derive a new formula to compute the gravitational light shifts as measured by two observers which are normal to the spacelike hypersurfaces defining the foliation. This formula is quite general and is also independent of the existence of Killing fields. Known examples are cons... |
gr-qc/9509057 | Robert Manuel Wald | Robert M. Wald | Quantum Field Theory in Curved Spacetime | Write-up of plenary talk given at GR14; 18 pages; plain LaTeX file | null | null | null | gr-qc | null | We review the mathematically rigorous formulation of the quantum theory of a
linear field propagating in a globally hyperbolic spacetime. This formulation
is accomplished via the algebraic approach, which, in essence, simultaneously
admits all states in all possible (unitarily inequivalent) Hilbert space
construction... | [
{
"created": "Fri, 29 Sep 1995 16:37:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wald",
"Robert M.",
""
]
] | We review the mathematically rigorous formulation of the quantum theory of a linear field propagating in a globally hyperbolic spacetime. This formulation is accomplished via the algebraic approach, which, in essence, simultaneously admits all states in all possible (unitarily inequivalent) Hilbert space constructions.... |
gr-qc/9706082 | Bill Walker | William D. Walker, J. Dual | Propagation Speed of Longitudinally Oscillating Gravitational and
Electrical Fields | No changes - better PS, 13 pages, PS | null | null | null | gr-qc | null | The near-field Lienard-Wiechert potential solution of a longitudinally
oscillating electrical field produced by an oscillating charge is presented,
and the results are compared to the R. P. Feynman multipole far-field solution.
The results indicate that the phase speed of a longitudinally oscillating
electrical field... | [
{
"created": "Fri, 27 Jun 1997 14:29:59 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jul 1997 18:37:18 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Walker",
"William D.",
""
],
[
"Dual",
"J.",
""
]
] | The near-field Lienard-Wiechert potential solution of a longitudinally oscillating electrical field produced by an oscillating charge is presented, and the results are compared to the R. P. Feynman multipole far-field solution. The results indicate that the phase speed of a longitudinally oscillating electrical field i... |
gr-qc/9702034 | Frank Gronwald | Frank Gronwald | Metric-Affine Gauge Theory of Gravity I. Fundamental Structure and Field
Equations | 43 pages, LaTeX, six .eps figures included, uses lscape.sty, to
appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D6 (1997) 263-304 | 10.1142/S0218271897000157 | null | gr-qc hep-th | null | We give a self-contained introduction into the metric-affine gauge theory of
gravity. Starting from the equivalence of reference frames, the prototype of a
gauge theory is presented and illustrated by the example of Yang-Mills theory.
Along the same lines we perform a gauging of the affine group and establish the
geo... | [
{
"created": "Tue, 18 Feb 1997 16:56:38 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Gronwald",
"Frank",
""
]
] | We give a self-contained introduction into the metric-affine gauge theory of gravity. Starting from the equivalence of reference frames, the prototype of a gauge theory is presented and illustrated by the example of Yang-Mills theory. Along the same lines we perform a gauging of the affine group and establish the geome... |
gr-qc/9701066 | Marian Fecko | Marian Fecko | On 3+1 decompositions with respect to an observer field via differential
forms | 15 pages, AmsTeX, to be published in J.Math.Phys. (sept.'97), minor
changes done | J.Math.Phys. 38 (1997) 4542-4560 | 10.1063/1.532142 | null | gr-qc dg-ga math-ph math.DG math.MP | null | 3+1 decompositions of differential forms on a Lorentzian manifold (M,g;+ - -
-) with respect to arbitrary observer field and the decomposition of the
standard operations acting on them are studied, making use of the ideas of the
theory of connections on principal bundles. Simple explicit general formulas
are given as... | [
{
"created": "Thu, 30 Jan 1997 15:48:48 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jun 1997 13:08:37 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Fecko",
"Marian",
""
]
] | 3+1 decompositions of differential forms on a Lorentzian manifold (M,g;+ - - -) with respect to arbitrary observer field and the decomposition of the standard operations acting on them are studied, making use of the ideas of the theory of connections on principal bundles. Simple explicit general formulas are given as w... |
0809.0927 | Matt Visser | Matt Visser (Victoria University of Wellington) | Traversable wormholes from surgically modified Schwarzschild spacetimes | Pre-arXiv article from 1989; 12 pages, no figures. (Uploaded to arXiv
to help researchers with limited library facilities.) | Nucl.Phys.B328:203-212,1989 | 10.1016/0550-3213(89)90100-4 | LA-UR-89-244 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper I present a new class of traversable wormholes. This is done by
surgically grafting two Schwarzschild spacetimes together in such a way that no
event horizon is permitted to form. This surgery concentrates a non--zero
stress--energy on the boundary layer between the two asymptotically flat
regions. I sh... | [
{
"created": "Thu, 4 Sep 2008 22:35:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | In this paper I present a new class of traversable wormholes. This is done by surgically grafting two Schwarzschild spacetimes together in such a way that no event horizon is permitted to form. This surgery concentrates a non--zero stress--energy on the boundary layer between the two asymptotically flat regions. I shal... |
gr-qc/0302081 | Pieter-Jan De Smet | Pieter-Jan De Smet | Five-dimensional metrics of Petrov type 22 | 13 pages, 1 figure | Class.Quant.Grav. 20 (2003) 2541-2552 | 10.1088/0264-9381/20/13/306 | YITP-SB-03/7 | gr-qc hep-th | null | We classify all five-dimensional Einstein manifolds that are static, have an
SO(3) isometry group and have Petrov type 22. We use this classification to
show that the localized black hole in the Randall-Sundrum scenario necessarily
has Petrov type 4.
| [
{
"created": "Wed, 19 Feb 2003 20:37:43 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"De Smet",
"Pieter-Jan",
""
]
] | We classify all five-dimensional Einstein manifolds that are static, have an SO(3) isometry group and have Petrov type 22. We use this classification to show that the localized black hole in the Randall-Sundrum scenario necessarily has Petrov type 4. |
1101.0319 | Jun Wu | Y.J.Zhang, J. Wu and P.T.Leung | High-frequency behavior of w-mode pulsations of compact stars | 22 pages, 4 figures | Phys.Rev.D83:064012,2011 | 10.1103/PhysRevD.83.064012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the asymptotic behavior of the quasi-normal modes (QNMs) of w-mode
pulsations of compact stars in the high-frequency regime. We observe that both
the axial and polar w-mode QNMs attain similar asymptotic behaviors in spite of
the fact that they are described by two totally different differential equation
sys... | [
{
"created": "Sat, 1 Jan 2011 04:58:57 GMT",
"version": "v1"
}
] | 2011-03-22 | [
[
"Zhang",
"Y. J.",
""
],
[
"Wu",
"J.",
""
],
[
"Leung",
"P. T.",
""
]
] | We study the asymptotic behavior of the quasi-normal modes (QNMs) of w-mode pulsations of compact stars in the high-frequency regime. We observe that both the axial and polar w-mode QNMs attain similar asymptotic behaviors in spite of the fact that they are described by two totally different differential equation syste... |
gr-qc/9908026 | David Wands | Damien J. Holden and David Wands | Self-similar cosmological solutions with a non-minimally coupled scalar
field | 10 pages, 1 figure, revtex version to appear in Phys Rev D,
references added | Phys.Rev.D61:043506,2000 | 10.1103/PhysRevD.61.043506 | null | gr-qc astro-ph | null | We present self-similar cosmological solutions for a barotropic fluid plus
scalar field with Brans-Dicke-type coupling to the spacetime curvature and an
arbitrary power-law potential energy. We identify all the fixed points in the
autonomous phase-plane, including a scaling solution where the fluid density
scales wit... | [
{
"created": "Mon, 9 Aug 1999 13:20:06 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Oct 1999 13:32:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Holden",
"Damien J.",
""
],
[
"Wands",
"David",
""
]
] | We present self-similar cosmological solutions for a barotropic fluid plus scalar field with Brans-Dicke-type coupling to the spacetime curvature and an arbitrary power-law potential energy. We identify all the fixed points in the autonomous phase-plane, including a scaling solution where the fluid density scales with ... |
1611.02013 | Pantelis Apostolopoulos | Pantelis S. Apostolopoulos | Vacuum self similar anisotropic cosmologies in $F(R)-$gravity | 16 pages, no figures, (v2) section 4 is slightly extended (including
the reformulation of the field equations in dimensionless variables) to match
the accepted version in General Relativity and Gravitation | Gen.Rel.Grav. 49 (2017) no.4, 59 | 10.1007/s10714-017-2222-y | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The implications from the existence of a proper Homothetic Vector Field (HVF)
on the dynamics of vacuum anisotropic models in $F(R)$ gravitational theory are
studied. The fact that \emph{every} Spatially Homogeneous vacuum model is
equivalent, formally, with a "flux" -free anisotropic fluid model in standard
gravity ... | [
{
"created": "Mon, 7 Nov 2016 12:19:10 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2017 08:09:47 GMT",
"version": "v2"
}
] | 2017-03-28 | [
[
"Apostolopoulos",
"Pantelis S.",
""
]
] | The implications from the existence of a proper Homothetic Vector Field (HVF) on the dynamics of vacuum anisotropic models in $F(R)$ gravitational theory are studied. The fact that \emph{every} Spatially Homogeneous vacuum model is equivalent, formally, with a "flux" -free anisotropic fluid model in standard gravity an... |
1612.01615 | Zhi-Chao Zhao | Zhe Chang, Chao-Guang Huang, Zhi-Chao Zhao | Is GW151226 a really signal of gravitational wave? | null | null | 10.1088/1674-1137/41/2/025001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the LIGO Scientific Collaboration and Virgo Collaboration published
the second observation on gravitational wave GW151226 [Phys. Rev. Lett. 116,
241103 (2016)] from the binary black hole coalescence with initial masses about
14 M$_\odot$ and 8 M$_\odot$. They claimed that the peak gravitational strain
was r... | [
{
"created": "Tue, 6 Dec 2016 01:13:47 GMT",
"version": "v1"
}
] | 2016-12-07 | [
[
"Chang",
"Zhe",
""
],
[
"Huang",
"Chao-Guang",
""
],
[
"Zhao",
"Zhi-Chao",
""
]
] | Recently, the LIGO Scientific Collaboration and Virgo Collaboration published the second observation on gravitational wave GW151226 [Phys. Rev. Lett. 116, 241103 (2016)] from the binary black hole coalescence with initial masses about 14 M$_\odot$ and 8 M$_\odot$. They claimed that the peak gravitational strain was rea... |
gr-qc/0604096 | Katanaev | M. O. Katanaev | Polynomial Hamiltonian form of General Relativity | 33 pages, 1 figure, corrected references | Theor.Math.Phys. 148 (2006) 1264-1294; Teor.Mat.Fiz. 148 (2006)
459-494 | 10.1007/s11232-006-0116-3 | null | gr-qc | null | Phase space of General Relativity is extended to a Poisson manifold by
inclusion of the determinant of the metric and conjugate momentum as additional
independent variables. As a result, the action and the constraints take a
polynomial form. New expression for the generating functional for the Green
functions is prop... | [
{
"created": "Fri, 21 Apr 2006 17:18:57 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2006 18:08:54 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Katanaev",
"M. O.",
""
]
] | Phase space of General Relativity is extended to a Poisson manifold by inclusion of the determinant of the metric and conjugate momentum as additional independent variables. As a result, the action and the constraints take a polynomial form. New expression for the generating functional for the Green functions is propos... |
2103.14568 | Brajesh Gupt | Abhay Ashtekar, Brajesh Gupt, and V. Sreenath | Cosmic tango between the very small and the very large: Addressing CMB
anomalies through Loop Quantum Cosmology | 30 pages, 9 figures | Frontiers in Astronomy & Space Science, 8, 685288 (2021) | 10.3389/fspas.2021.685288 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While the standard, six-parameter, spatially flat $\Lambda$CDM model has been
highly successful, certain anomalies in the cosmic microwave background bring
out a tension between this model and observations. The statistical significance
of any one anomaly is small. However, taken together, the presence of two or
more ... | [
{
"created": "Fri, 26 Mar 2021 16:28:46 GMT",
"version": "v1"
}
] | 2021-09-21 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Gupt",
"Brajesh",
""
],
[
"Sreenath",
"V.",
""
]
] | While the standard, six-parameter, spatially flat $\Lambda$CDM model has been highly successful, certain anomalies in the cosmic microwave background bring out a tension between this model and observations. The statistical significance of any one anomaly is small. However, taken together, the presence of two or more of... |
0801.3142 | Michael Holst | Burak Aksoylu, David Bernstein, Stephen Bond, Michael Holst | Generating Initial Data in General Relativity using Adaptive Finite
Element Methods | 54 pages, 15 figures. Published as LSU CCT Technical Report 2008-09 | null | null | LSU Center for Computation and Technology (CCT) Technical Report
2008-09 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conformal formulation of the Einstein constraint equations is first
reviewed, and we then consider the design, analysis, and implementation of
adaptive multilevel finite element-type numerical methods for the resulting
coupled nonlinear elliptic system. We derive weak formulations of the coupled
constraints, and ... | [
{
"created": "Mon, 21 Jan 2008 07:23:52 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Feb 2008 22:28:01 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Apr 2009 14:22:04 GMT",
"version": "v3"
}
] | 2009-04-07 | [
[
"Aksoylu",
"Burak",
""
],
[
"Bernstein",
"David",
""
],
[
"Bond",
"Stephen",
""
],
[
"Holst",
"Michael",
""
]
] | The conformal formulation of the Einstein constraint equations is first reviewed, and we then consider the design, analysis, and implementation of adaptive multilevel finite element-type numerical methods for the resulting coupled nonlinear elliptic system. We derive weak formulations of the coupled constraints, and re... |
1505.06725 | Matthew Pitkin | M. Pitkin | Comment on "Measurements of Newton's gravitational constant and the
length of day" | To be published in EPL. This is an abridged version of the original
document to conform the the journal's "Comment" page limit, therefore further
figures, tables and explanation of the analysis can be found in v1
arXiv:1505.06725v1. This also contains a response to the comment
arXiv:1508.00532. The analysis cod... | null | 10.1209/0295-5075/111/30002 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There have been recent claims (Anderson et al., EPL, 110, 10002) of a 5.9
year periodicity in measurements of Newton's gravitational constant, $G$, which
show a very strong correlation with observed periodic variations in the length
of the day. I have used Bayesian model comparison to test this claim compared
to othe... | [
{
"created": "Mon, 25 May 2015 19:47:12 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 2015 11:18:32 GMT",
"version": "v2"
}
] | 2015-09-02 | [
[
"Pitkin",
"M.",
""
]
] | There have been recent claims (Anderson et al., EPL, 110, 10002) of a 5.9 year periodicity in measurements of Newton's gravitational constant, $G$, which show a very strong correlation with observed periodic variations in the length of the day. I have used Bayesian model comparison to test this claim compared to other ... |
gr-qc/0103107 | Hans Ringstrom | Hans Ringstrom | The future asymptotics of Bianchi VIII vacuum solutions | 34 pages, no figures | Class.Quant.Grav. 18 (2001) 3791-3824 | 10.1088/0264-9381/18/18/302 | null | gr-qc | null | Bianchi VIII vacuum solutions to Einstein's equations are causally
geodesically complete to the future, given an appropriate time orientation, and
the objective of this article is to analyze the asymptotic behaviour of
solutions in this time direction. For the Bianchi class A spacetimes, there is
a formulation of the... | [
{
"created": "Thu, 29 Mar 2001 07:15:25 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ringstrom",
"Hans",
""
]
] | Bianchi VIII vacuum solutions to Einstein's equations are causally geodesically complete to the future, given an appropriate time orientation, and the objective of this article is to analyze the asymptotic behaviour of solutions in this time direction. For the Bianchi class A spacetimes, there is a formulation of the f... |
2007.10080 | Lijing Shao | Rui Xu, Yong Gao, Lijing Shao | Strong-field effects in massive scalar-tensor gravity for slowly
spinning neutron stars and application to X-ray pulsar pulse profiles | 15 pages, 10 figures; accepted by PRD | Phys. Rev. D 102, 064057 (2020) | 10.1103/PhysRevD.102.064057 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutron stars (NSs) in scalar-tensor (ST) theories of gravitation can acquire
scalar charges and generate distinct spacetimes from those in General
Relativity (GR) through the celebrated phenomenon of spontaneous scalarization.
Taking on an ST theory with the mass term of the scalar field, we determine the
theory par... | [
{
"created": "Mon, 20 Jul 2020 13:22:31 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Sep 2020 15:22:30 GMT",
"version": "v2"
}
] | 2020-09-30 | [
[
"Xu",
"Rui",
""
],
[
"Gao",
"Yong",
""
],
[
"Shao",
"Lijing",
""
]
] | Neutron stars (NSs) in scalar-tensor (ST) theories of gravitation can acquire scalar charges and generate distinct spacetimes from those in General Relativity (GR) through the celebrated phenomenon of spontaneous scalarization. Taking on an ST theory with the mass term of the scalar field, we determine the theory param... |
2110.10569 | Jaroslav Vrba | Zden\v{e}k Stuchl\'ik and Jaroslav Vrba | Epicyclic orbits in the field of Einstein-Dirac-Maxwell traversable
wormholes applied to the quasiperiodic oscillations observed in microquasars
and active galactic nuclei | 14 pages, 11 figures, 2 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the epicyclic oscillatory motion around circular orbits of the
traversable asymptotically flat and reflection-symmetric wormholes obtained in
the Einstein-Dirac-Maxwell theory without applying exotic matter in their
construction. We determine frequencies of the orbital and epicyclic motion in
the Keplerian d... | [
{
"created": "Wed, 20 Oct 2021 13:58:01 GMT",
"version": "v1"
}
] | 2021-10-22 | [
[
"Stuchlík",
"Zdeněk",
""
],
[
"Vrba",
"Jaroslav",
""
]
] | We study the epicyclic oscillatory motion around circular orbits of the traversable asymptotically flat and reflection-symmetric wormholes obtained in the Einstein-Dirac-Maxwell theory without applying exotic matter in their construction. We determine frequencies of the orbital and epicyclic motion in the Keplerian dis... |
1506.00946 | John F. Donoghue | John F. Donoghue and Barry R. Holstein | Low Energy Theorems of Quantum Gravity from Effective Field Theory | Invited Topical Review for J. Phys. G, 35 pages | null | 10.1088/0954-3899/42/10/103102 | ACFI-T15-05 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this survey, we review some of the low energy quantum predictions of
General Relativity which are independent of details of the yet unknown
high-energy completion of the gravitational interaction. Such predictions can
be extracted using the techniques of effective field theory.
| [
{
"created": "Tue, 2 Jun 2015 16:24:49 GMT",
"version": "v1"
}
] | 2015-09-30 | [
[
"Donoghue",
"John F.",
""
],
[
"Holstein",
"Barry R.",
""
]
] | In this survey, we review some of the low energy quantum predictions of General Relativity which are independent of details of the yet unknown high-energy completion of the gravitational interaction. Such predictions can be extracted using the techniques of effective field theory. |
gr-qc/9710017 | Hector F. Hernandez G. | L. Herrera, H.Hernandez, L. A. Nunez, U. Percoco | On the Eccentricity Behaviour of Radiating Slowly Rotating Bodies | 13 Latex pages, 4 figures, Submitted to Classical and Quantum Gravity | Class.Quant.Grav.15:187-196,1998 | 10.1088/0264-9381/15/1/013 | null | gr-qc | null | We study different models of radiating slowly rotating bodies up to the first
order in the angular velocity. It is shown that up to this order the evolution
of the eccentricity is highly model-dependent even for very compact objects.
| [
{
"created": "Thu, 2 Oct 1997 19:46:30 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Herrera",
"L.",
""
],
[
"Hernandez",
"H.",
""
],
[
"Nunez",
"L. A.",
""
],
[
"Percoco",
"U.",
""
]
] | We study different models of radiating slowly rotating bodies up to the first order in the angular velocity. It is shown that up to this order the evolution of the eccentricity is highly model-dependent even for very compact objects. |
gr-qc/9906009 | Ms. Amita Shaw | S.Biswas, A.Shaw and D.Biswas | Schroedinger Wheeler-DeWitt Equation In Multidimensional Cosmology | 10 Pages, LaTeX, no figure | Int.J.Mod.Phys.D10:585-594,2001 | 10.1142/S0218271801001372 | null | gr-qc | null | We study multidimensional cosmology to obtain the wavefunction of the
universe using wormhole dominance proposal. Using a prescription for time we
obtain the Schroedinger-Wheeler-DeWitt equation without any reference to WD
equation and WKB ansatz for WD wavefunction. It is found that the
Hartle-Hawking or wormhole-do... | [
{
"created": "Thu, 3 Jun 1999 09:01:43 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Biswas",
"S.",
""
],
[
"Shaw",
"A.",
""
],
[
"Biswas",
"D.",
""
]
] | We study multidimensional cosmology to obtain the wavefunction of the universe using wormhole dominance proposal. Using a prescription for time we obtain the Schroedinger-Wheeler-DeWitt equation without any reference to WD equation and WKB ansatz for WD wavefunction. It is found that the Hartle-Hawking or wormhole-domi... |
gr-qc/0307080 | Daniel A. Shaddock | Daniel A. Shaddock, Massimo Tinto, Frank B. Estabrook, J. W. Armstrong | Data Combinations Accounting for LISA Spacecraft Motion | 10 pages, 3 figures | Phys.Rev. D68 (2003) 061303 | 10.1103/PhysRevD.68.061303 | null | gr-qc | null | LISA is an array of three spacecraft in an approximately equilateral triangle
configuration which will be used as a low-frequency gravitational wave
detector. We present here new generalizations of the Michelson- and Sagnac-type
time-delay interferometry data combinations. These combinations cancel laser
phase noise ... | [
{
"created": "Wed, 16 Jul 2003 21:11:58 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Shaddock",
"Daniel A.",
""
],
[
"Tinto",
"Massimo",
""
],
[
"Estabrook",
"Frank B.",
""
],
[
"Armstrong",
"J. W.",
""
]
] | LISA is an array of three spacecraft in an approximately equilateral triangle configuration which will be used as a low-frequency gravitational wave detector. We present here new generalizations of the Michelson- and Sagnac-type time-delay interferometry data combinations. These combinations cancel laser phase noise in... |
1403.5319 | Ahmed Farag Ali | Adel Awad and Ahmed Farag Ali | Planck-Scale Corrections to Friedmann Equation | 15 pages, no figure, to appear in Central Eur.J.Phys. arXiv admin
note: text overlap with arXiv:1301.3508 | Central Eur.J.Phys. 12 (2014) 245-255 | 10.2478/s11534-014-0441-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Verlinde proposed that gravity is an emergent phenomenon which
originates from an entropic force. In this work, we extend Verlinde's proposal
to accommodate generalized uncertainty principles (GUP), which are suggested by
some approaches to \emph{quantum gravity} such as string theory, black hole
physics an... | [
{
"created": "Thu, 20 Mar 2014 22:35:51 GMT",
"version": "v1"
}
] | 2014-04-24 | [
[
"Awad",
"Adel",
""
],
[
"Ali",
"Ahmed Farag",
""
]
] | Recently, Verlinde proposed that gravity is an emergent phenomenon which originates from an entropic force. In this work, we extend Verlinde's proposal to accommodate generalized uncertainty principles (GUP), which are suggested by some approaches to \emph{quantum gravity} such as string theory, black hole physics and ... |
2207.05304 | Zinnat Hassan | Zinnat Hassan, G. Mustafa, Joao R.L. Santos, P.K. Sahoo | Embedding procedure and wormhole solutions in $f(Q)$ gravity | EPL published version | Europhysics Letters, 139(3) (2022) 39001 | 10.1209/0295-5075/ac8017 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | An intriguing solution that appears in General Relativity (GR) but has not
been observed so far is the wormhole. This exotic solution describes a
topological bridge connecting two distinct universes or two different points in
the same universe. It is known that the traversable wormhole solutions violate
all the energ... | [
{
"created": "Tue, 12 Jul 2022 04:29:40 GMT",
"version": "v1"
}
] | 2022-08-08 | [
[
"Hassan",
"Zinnat",
""
],
[
"Mustafa",
"G.",
""
],
[
"Santos",
"Joao R. L.",
""
],
[
"Sahoo",
"P. K.",
""
]
] | An intriguing solution that appears in General Relativity (GR) but has not been observed so far is the wormhole. This exotic solution describes a topological bridge connecting two distinct universes or two different points in the same universe. It is known that the traversable wormhole solutions violate all the energy ... |
1601.05518 | Suman Ghosh | Suman Ghosh | Spin 1/2 field and regularization in de Sitter and radiation dominated
universe | 12 pages, 10 figures, version accepted for publication in Physical
Review D. arXiv admin note: substantial text overlap with arXiv:1506.06909 | null | 10.1103/PhysRevD.93.044032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a simple algorithm to derive number density of spin 1/2
particles created in spatially flat FLRW spacetimes and resulting renormalized
energy-momentum tensor within the framework of adiabatic regularization.
Physical quantities thus found are in agreement with the known results. This
formalism can be con... | [
{
"created": "Thu, 21 Jan 2016 05:48:10 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Ghosh",
"Suman",
""
]
] | We construct a simple algorithm to derive number density of spin 1/2 particles created in spatially flat FLRW spacetimes and resulting renormalized energy-momentum tensor within the framework of adiabatic regularization. Physical quantities thus found are in agreement with the known results. This formalism can be consi... |
1403.0896 | Richard Woodard | Katie E. Leonard (Applied Mathematics), Sohyun Park (Penn State
University), Tomislav Prokopec (Utrecht University) and R. P. Woodard
(University of Florida) | Representing the Graviton Self-Energy on de Sitter Background | 38 pages, no figures, uses LaTeX2e, version 2 (39 pages) revised for
publication with many errors corrected | Phys. Rev. D 90, 024032 (2014) | 10.1103/PhysRevD.90.024032 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a noncovariant but simple representation for the self-energy of a
conformally transformed graviton field on the cosmological patch of de Sitter.
Our representation involves four structure functions, as opposed to the two
that would be necessary for a manifestly de Sitter invariant representation. We
work ou... | [
{
"created": "Tue, 4 Mar 2014 18:43:12 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 2014 05:53:30 GMT",
"version": "v2"
}
] | 2014-07-18 | [
[
"Leonard",
"Katie E.",
"",
"Applied Mathematics"
],
[
"Park",
"Sohyun",
"",
"Penn State\n University"
],
[
"Prokopec",
"Tomislav",
"",
"Utrecht University"
],
[
"Woodard",
"R. P.",
"",
"University of Florida"
]
] | We derive a noncovariant but simple representation for the self-energy of a conformally transformed graviton field on the cosmological patch of de Sitter. Our representation involves four structure functions, as opposed to the two that would be necessary for a manifestly de Sitter invariant representation. We work out ... |
2309.08203 | Jia-Hui Huang | Wenbin Li, Kai-Peng Lu, W. LiMing and Jia-Hui Huang | Stability of five-dimensional Myers-Perry black holes under massive
scalar perturbation: bound states and quasinormal modes | references added | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The stability of five-dimensional singly rotating Myers-Perry Black Holes
against massive scalar perturbations is studied. Both the quasibound states and
quasinormal modes of the massive scalar field are considered. For the
quasibound states, we use an analytical method to discuss the effective
potential felt by the ... | [
{
"created": "Fri, 15 Sep 2023 07:12:18 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Sep 2023 12:21:40 GMT",
"version": "v2"
}
] | 2023-09-26 | [
[
"Li",
"Wenbin",
""
],
[
"Lu",
"Kai-Peng",
""
],
[
"LiMing",
"W.",
""
],
[
"Huang",
"Jia-Hui",
""
]
] | The stability of five-dimensional singly rotating Myers-Perry Black Holes against massive scalar perturbations is studied. Both the quasibound states and quasinormal modes of the massive scalar field are considered. For the quasibound states, we use an analytical method to discuss the effective potential felt by the sc... |
0710.1351 | Jacques Smulevici | Jacques Smulevici | Strong cosmic censorship for T^2-symmetric spacetimes with cosmological
constant and matter | 29 pages, 6 figures, v2 is the version published in Annales Henri
Poincare | AnnalesHenriPoincare9:1425-1453,2008 | 10.1007/s00023-008-0391-7 | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the issue of strong cosmic censorship for T^2-symmetric spacetimes
with positive cosmological constant. In the case of collisionless matter, we
complete the proof of the C^2 formulation of the conjecture for this class of
spacetimes. In the vacuum case, we prove that the conjecture holds for the
special ca... | [
{
"created": "Sat, 6 Oct 2007 14:38:08 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Apr 2009 09:53:06 GMT",
"version": "v2"
}
] | 2009-04-07 | [
[
"Smulevici",
"Jacques",
""
]
] | We address the issue of strong cosmic censorship for T^2-symmetric spacetimes with positive cosmological constant. In the case of collisionless matter, we complete the proof of the C^2 formulation of the conjecture for this class of spacetimes. In the vacuum case, we prove that the conjecture holds for the special case... |
0902.0559 | Francisco Lobo | Orfeu Bertolami, Francisco S. N. Lobo | Time and Causation | 12 pages. To appear in a special issue of NeuroQuantology | NeuroQuantol.7:1-15,2009 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review paper, we consider the fundamental nature of time and
causality, most particularly, in the context of the theories of special and
general relativity. We also discuss the issue of closed timelike curves in the
context of general relativity, and the associated paradoxes, the question of
directionality of... | [
{
"created": "Tue, 3 Feb 2009 17:24:18 GMT",
"version": "v1"
}
] | 2009-04-15 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this review paper, we consider the fundamental nature of time and causality, most particularly, in the context of the theories of special and general relativity. We also discuss the issue of closed timelike curves in the context of general relativity, and the associated paradoxes, the question of directionality of t... |
2202.04118 | Bita Farsi | Bita Farsi, Ahmad Sheykhi | Structure formation in mimetic gravity | 13 pages, 13 figures | Phys. Rev. D 106, 024053 (2022) | 10.1103/PhysRevD.106.024053 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We disclose the effects of an extra longitudinal degree of freedom on the
evolution of perturbations in the framework of mimetic gravity. We consider a
flat Friedmann-Robertson-Walker (FRW) background and explore the linear
perturbations by adopting the spherically symmetric collapse formalism. By
suitably choosing t... | [
{
"created": "Tue, 8 Feb 2022 19:45:04 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2022 06:50:13 GMT",
"version": "v2"
}
] | 2022-08-02 | [
[
"Farsi",
"Bita",
""
],
[
"Sheykhi",
"Ahmad",
""
]
] | We disclose the effects of an extra longitudinal degree of freedom on the evolution of perturbations in the framework of mimetic gravity. We consider a flat Friedmann-Robertson-Walker (FRW) background and explore the linear perturbations by adopting the spherically symmetric collapse formalism. By suitably choosing the... |
gr-qc/0307064 | Tiberiu Harko | T. Harko | Gravitational collapse of a Hagedorn fluid in Vaidya geometry | 14 pages, 2 figures, to appear in Phys. Rev. D | Phys.Rev. D68 (2003) 064005 | 10.1103/PhysRevD.68.064005 | null | gr-qc hep-th | null | The gravitational collapse of a high-density null charged matter fluid,
satisfying the Hagedorn equation of state, is considered in the framework of
the Vaidya geometry. The general solution of the gravitational field equations
can be obtained in an exact parametric form. The conditions for the formation
of a naked s... | [
{
"created": "Mon, 14 Jul 2003 01:37:47 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Harko",
"T.",
""
]
] | The gravitational collapse of a high-density null charged matter fluid, satisfying the Hagedorn equation of state, is considered in the framework of the Vaidya geometry. The general solution of the gravitational field equations can be obtained in an exact parametric form. The conditions for the formation of a naked sin... |
1008.4639 | Matt Visser | Bethan Cropp (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Any spacetime has a Bianchi type I spacetime as a limit | 19 pages; no figures | Class.Quant.Grav.28:055007,2011 | 10.1088/0264-9381/28/5/055007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pick an arbitrary timelike geodesic in an arbitrary spacetime. We demonstrate
that there is a particular limiting process, an "ultra-local limit", in which
the immediate neighborhood of the timelike geodesic can be "blown up" to yield
a general (typically non-diagonal) Bianchi type I spacetime. This process
shares so... | [
{
"created": "Fri, 27 Aug 2010 04:36:42 GMT",
"version": "v1"
}
] | 2011-02-18 | [
[
"Cropp",
"Bethan",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Pick an arbitrary timelike geodesic in an arbitrary spacetime. We demonstrate that there is a particular limiting process, an "ultra-local limit", in which the immediate neighborhood of the timelike geodesic can be "blown up" to yield a general (typically non-diagonal) Bianchi type I spacetime. This process shares some... |
1411.0941 | Supriya Pan | Subenoy Chakraborty, Supriya Pan, and Subhajit Saha | A third alternative to explain recent observations: Future deceleration | 9 pages, 3 figures | Physics Letters B 738, 424 (2014) | 10.1016/j.physletb.2014.10.009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work we discuss a third alternative to explain the latest
observational data concerning the accelerating Universe and its different
stages. The particle creation mechanism in the framework of non-equilibrium
thermodynamics is considered as a basic cosmic mechanism acting on the flat FRW
geometry. By as... | [
{
"created": "Thu, 30 Oct 2014 07:37:19 GMT",
"version": "v1"
}
] | 2016-05-17 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Pan",
"Supriya",
""
],
[
"Saha",
"Subhajit",
""
]
] | In the present work we discuss a third alternative to explain the latest observational data concerning the accelerating Universe and its different stages. The particle creation mechanism in the framework of non-equilibrium thermodynamics is considered as a basic cosmic mechanism acting on the flat FRW geometry. By assu... |
gr-qc/0207068 | Alexander E. Margolin | A.E.Shalyt-Margolin (NC PHEP, Belarus), A.Ya.Tregubovich (IP NAS
Belarus) | Generalized Uncertainty Relations,Fundamental Length and Density Matrix | 11 pages, no figures,some corrections of abstract,introduction and
section 2 | null | null | null | gr-qc | null | It was shown that if in Quantum Theory a fundamental length exists and a
well-known measurement procedure is used, then the density matrix at the Planck
scale cannot be defined in the usual way, because in this case density matrix
trace is strongly less than one.
Density matrix must be changed by a progenitrix or a... | [
{
"created": "Thu, 18 Jul 2002 15:29:37 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Oct 2002 10:25:00 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Aug 2003 06:16:20 GMT",
"version": "v3"
}
] | 2016-08-31 | [
[
"Shalyt-Margolin",
"A. E.",
"",
"NC PHEP, Belarus"
],
[
"Tregubovich",
"A. Ya.",
"",
"IP NAS\n Belarus"
]
] | It was shown that if in Quantum Theory a fundamental length exists and a well-known measurement procedure is used, then the density matrix at the Planck scale cannot be defined in the usual way, because in this case density matrix trace is strongly less than one. Density matrix must be changed by a progenitrix or as we... |
1604.05301 | Sumanta Chakraborty | Sumanta Chakraborty and Soumitra SenGupta | Solving higher curvature gravity theories | Revised, 23 pages, no figures | Eur. Phys. J. C 76, 552 (2016) | 10.1140/epjc/s10052-016-4394-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solving field equations in the context of higher curvature gravity theories
is a formidable task. However in many situations, e.g., in the context of
$f(R)$ theories the higher curvature gravity action can be written as
Einstein-Hilbert action plus a scalar field action. We show that not only the
action but the field... | [
{
"created": "Mon, 18 Apr 2016 03:43:52 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Oct 2016 02:19:17 GMT",
"version": "v2"
}
] | 2016-10-11 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | Solving field equations in the context of higher curvature gravity theories is a formidable task. However in many situations, e.g., in the context of $f(R)$ theories the higher curvature gravity action can be written as Einstein-Hilbert action plus a scalar field action. We show that not only the action but the field e... |
gr-qc/0410064 | Jian Qi Shen | Guoyou Huang | On Structure and History of Space-time with Variable Speed of Light | 11 pages, Latex | null | null | null | gr-qc | null | We apply the variable speed of light into general relativity in order to
solve the problems we met in the standard cosmology. We're surprised to find
that, the results from the general relativity in cosmology are exactly the same
as those we got from Newtonian dynamics. The relation between the Newtonian
dynamics and... | [
{
"created": "Fri, 15 Oct 2004 04:51:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Huang",
"Guoyou",
""
]
] | We apply the variable speed of light into general relativity in order to solve the problems we met in the standard cosmology. We're surprised to find that, the results from the general relativity in cosmology are exactly the same as those we got from Newtonian dynamics. The relation between the Newtonian dynamics and t... |
gr-qc/0203050 | Lorenzo Iorio | Lorenzo Iorio | The impact of the static part of the Earth's gravity field on some tests
of General Relativity with Satellite Laser Ranging | LaTex2e, 18 pages, 5 tables. Preliminary estimates of the error in
the Lense-Thirring measurement due to geopotential according to EIGEN-1S
model added. To appear in Celestial Mechanics and Dynamical Astronomy | Celest.Mech.Dyn.Astron. 86 (2003) 277-294 | 10.1023/A:1024223200686 | null | gr-qc astro-ph physics.geo-ph physics.space-ph | null | In this paper we calculate explicitly the secular classical precessions of
the node \Omega and the perigee \omega of an Earth artificial satellite induced
by the static, even zonal harmonics of the geopotential up to degree l=20.
Subsequently, their systematic errors induced by the mismodelling in the even
zonal geop... | [
{
"created": "Thu, 14 Mar 2002 16:38:34 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Mar 2002 14:15:14 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Mar 2002 16:28:18 GMT",
"version": "v3"
},
{
"created": "Tue, 23 Apr 2002 14:22:45 GMT",
"version": "v4"
},
{
"c... | 2007-11-12 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we calculate explicitly the secular classical precessions of the node \Omega and the perigee \omega of an Earth artificial satellite induced by the static, even zonal harmonics of the geopotential up to degree l=20. Subsequently, their systematic errors induced by the mismodelling in the even zonal geopot... |
gr-qc/0701101 | Lior M. Burko | Lior M. Burko | Towards a wave-extraction method for numerical relativity. V. Extracting
the Weyl scalars in the quasi-Kinnersley tetrad from spatial data | 13 pages | Phys.Rev.D75:084039,2007 | 10.1103/PhysRevD.75.084039 | null | gr-qc | null | We extract the Weyl scalars $\Psi_0$ and $\Psi_4$ in the quasi-Kinnersley
tetrad by finding initially the (gauge--, tetrad--, and
background--independent) transverse quasi-Kinnersley frame. This step still
leaves two undetermined degrees of freedom: the ratio $|\Psi_0|/|\Psi_4|$, and
one of the phases (the product $|... | [
{
"created": "Thu, 18 Jan 2007 03:06:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Burko",
"Lior M.",
""
]
] | We extract the Weyl scalars $\Psi_0$ and $\Psi_4$ in the quasi-Kinnersley tetrad by finding initially the (gauge--, tetrad--, and background--independent) transverse quasi-Kinnersley frame. This step still leaves two undetermined degrees of freedom: the ratio $|\Psi_0|/|\Psi_4|$, and one of the phases (the product $|\P... |
1705.09674 | Yakov Shlapentokh-Rothman | Igor Rodnianski and Yakov Shlapentokh-Rothman | The Asymptotically Self-Similar Regime for the Einstein Vacuum Equations | final version | null | null | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a local theory for the construction of singular spacetimes in all
spacetime dimensions which become asymptotically self-similar as the
singularity is approached. The techniques developed also allow us to construct
and classify exact self-similar solutions which correspond to the formal
asymptotic expansion... | [
{
"created": "Fri, 26 May 2017 18:11:47 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jun 2017 17:29:53 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Feb 2018 03:32:51 GMT",
"version": "v3"
}
] | 2018-02-27 | [
[
"Rodnianski",
"Igor",
""
],
[
"Shlapentokh-Rothman",
"Yakov",
""
]
] | We develop a local theory for the construction of singular spacetimes in all spacetime dimensions which become asymptotically self-similar as the singularity is approached. The techniques developed also allow us to construct and classify exact self-similar solutions which correspond to the formal asymptotic expansions ... |
1605.07614 | Gabriel Farrugia | Gabriel Farrugia, Jackson Levi Said, Matteo Luca Ruggiero | Solar System tests in $f(T)$ gravity | 16 pages, 1 figure | Phys. Rev. D 93, 104034 (2016) | 10.1103/PhysRevD.93.104034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the four solar system tests of gravity - perihelion
precession, light bending, Shapiro time delay, gravitational redshift - in
$f(T)$ gravity. In particular, we investigate the solution derived by Ruggiero
and Radicella, Phys. Rev. D 91, 104014 (2015), for a nondiagonal vierbein field
for a polynomial ... | [
{
"created": "Tue, 24 May 2016 17:51:52 GMT",
"version": "v1"
}
] | 2016-05-26 | [
[
"Farrugia",
"Gabriel",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Ruggiero",
"Matteo Luca",
""
]
] | We investigate the four solar system tests of gravity - perihelion precession, light bending, Shapiro time delay, gravitational redshift - in $f(T)$ gravity. In particular, we investigate the solution derived by Ruggiero and Radicella, Phys. Rev. D 91, 104014 (2015), for a nondiagonal vierbein field for a polynomial $f... |
gr-qc/0304101 | Charles Wang | Charles Wang | A nonlinear quantum model of the Friedmann universe | 11 pages of text + 4 pages for 8 figures | Class.Quant.Grav. 20 (2003) 3151-3164 | 10.1088/0264-9381/20/14/316 | null | gr-qc | null | A discussion is given of the quantisation of a physical system with finite
degrees of freedom subject to a Hamiltonian constraint by treating time as a
constrained classical variable interacting with an unconstrained quantum state.
This leads to a quantisation scheme that yields a Schrodinger-type equation
which is i... | [
{
"created": "Tue, 29 Apr 2003 13:01:13 GMT",
"version": "v1"
},
{
"created": "Thu, 1 May 2003 09:06:10 GMT",
"version": "v2"
},
{
"created": "Mon, 12 May 2003 11:28:29 GMT",
"version": "v3"
},
{
"created": "Mon, 19 May 2003 23:13:21 GMT",
"version": "v4"
},
{
"cr... | 2009-11-10 | [
[
"Wang",
"Charles",
""
]
] | A discussion is given of the quantisation of a physical system with finite degrees of freedom subject to a Hamiltonian constraint by treating time as a constrained classical variable interacting with an unconstrained quantum state. This leads to a quantisation scheme that yields a Schrodinger-type equation which is in ... |
gr-qc/0201006 | Helmut Friedrich | Helmut Friedrich | Conformal geodesics on vacuum space-times | null | Commun.Math.Phys. 235 (2003) 513-543 | 10.1007/s00220-003-0794-8 | null | gr-qc | null | We discuss properties of conformal geodesics on general, vacuum, and warped
product space-times and derive a system of conformal deviation equations. The
results are used to show how to construct on the Schwarzschild-Kruskal
space-time global conformal Gauss coordinates which extends smoothly and
without degeneracy t... | [
{
"created": "Thu, 3 Jan 2002 10:08:50 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Friedrich",
"Helmut",
""
]
] | We discuss properties of conformal geodesics on general, vacuum, and warped product space-times and derive a system of conformal deviation equations. The results are used to show how to construct on the Schwarzschild-Kruskal space-time global conformal Gauss coordinates which extends smoothly and without degeneracy to ... |
1408.5257 | Andrea Geralico | Donato Bini, Andrea Geralico, Sauro Succi | Particle scattering by a test fluid on a Schwarzschild spacetime: the
equation of state matters | 4 pages, 2 figures; published version | Eur. Phys. J. C 72, 1913 (2012) | 10.1140/epjc/s10052-012-1913-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of a massive test particle in a Schwarzschild spacetime surrounded
by a perfect fluid with equation of state $p_0= w \rho_0$ is investigated.
Deviations from geodesic motion are analyzed as a function of the parameter
$w$, ranging from $w=1$ which corresponds to the case of massive free scalar
fields, down... | [
{
"created": "Fri, 22 Aug 2014 10:47:44 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Succi",
"Sauro",
""
]
] | The motion of a massive test particle in a Schwarzschild spacetime surrounded by a perfect fluid with equation of state $p_0= w \rho_0$ is investigated. Deviations from geodesic motion are analyzed as a function of the parameter $w$, ranging from $w=1$ which corresponds to the case of massive free scalar fields, down i... |
gr-qc/9606081 | Ayon Juan Eloy | Eloy Ay\'on-Beato | Staticity Theorem for Non-Rotating Black Holes with Non-Minimally
Coupled Self-Interacting Scalar Fields | 8 pages, LaTeX; new version to appear in ``Exact Solutions and Scalar
Fields in Gravity: Recent Developments,'' eds. A. Macias, J. Cervantes-Cota,
and C. Laemmerzahl (Kluwer Academic Publishing) | ``Exact Solutions and Scalar Fields in Gravity: Recent
Developments,'' edited by A. Macias, J.L. Cervantes-Cota, and C. Laemmerzahl
(Kluwer Academic/Plenum Publishers, New York 2001), p. 263. | null | null | gr-qc | null | Self-interacting scalar field configurations which are non-minimally coupled
($\zeta\neq0$) to the gravity of a strictly stationary black hole with
non-rotating horizon are studied. It is concluded that for analytical
configurations the corresponding domain of outer communications is static.
| [
{
"created": "Fri, 28 Jun 1996 03:03:21 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2001 18:11:14 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Ayón-Beato",
"Eloy",
""
]
] | Self-interacting scalar field configurations which are non-minimally coupled ($\zeta\neq0$) to the gravity of a strictly stationary black hole with non-rotating horizon are studied. It is concluded that for analytical configurations the corresponding domain of outer communications is static. |
0812.0921 | Dah-Wei Chiou | Dah-Wei Chiou | Effective equations of motion for constrained quantum systems: A study
of the Bianchi I loop quantum cosmology | 30 pages | null | null | IGC-08/11-7 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new mathematical framework is formulated to derive the effective equations
of motion for the constrained quantum system which possesses an internal clock.
In the realm close to classical behavior, the quantum evolution is approximated
by a finite system of coupled but ordinary differential equations adhered to
the ... | [
{
"created": "Thu, 4 Dec 2008 12:28:26 GMT",
"version": "v1"
}
] | 2008-12-05 | [
[
"Chiou",
"Dah-Wei",
""
]
] | A new mathematical framework is formulated to derive the effective equations of motion for the constrained quantum system which possesses an internal clock. In the realm close to classical behavior, the quantum evolution is approximated by a finite system of coupled but ordinary differential equations adhered to the we... |
1001.3237 | Yungui Gong | Fu-Wen Shu, Yungui Gong | Equipartition of energy and the first law of thermodynamics at the
apparent horizon | v2: 7 pages, 1 figure, add discussion on consistency check, Int. J.
Mod. Phys. D in press | Int. J. Mod. Phys. D 20 (2011) 553 | 10.1142/S0218271811018883 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the holographic principle and the equipartition law of energy to the
apparent horizon of a Friedmann-Robertson-Walker universe and derive the
Friedmann equation describing the dynamics of the universe. We also show that
the equipartition law of energy can be interpreted as the first law of
thermodynamics at ... | [
{
"created": "Tue, 19 Jan 2010 09:41:02 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Mar 2011 02:26:07 GMT",
"version": "v2"
}
] | 2011-05-05 | [
[
"Shu",
"Fu-Wen",
""
],
[
"Gong",
"Yungui",
""
]
] | We apply the holographic principle and the equipartition law of energy to the apparent horizon of a Friedmann-Robertson-Walker universe and derive the Friedmann equation describing the dynamics of the universe. We also show that the equipartition law of energy can be interpreted as the first law of thermodynamics at th... |
2309.04130 | Soumya Bhattacharya | Soumya Bhattacharya, Shramana Ghosh | Gravitational wave memory for a class of static and spherically
symmetric spacetimes | 21 pages, 14 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | This article aims at comparing gravitational wave memory effect in a
Schwarzschild spacetime with that of other compact objects with static and
spherically symmetric spacetime, with the purpose of proposing a procedure for
differentiating between various compact object geometries. We do this by
considering the relati... | [
{
"created": "Fri, 8 Sep 2023 05:08:52 GMT",
"version": "v1"
}
] | 2023-09-12 | [
[
"Bhattacharya",
"Soumya",
""
],
[
"Ghosh",
"Shramana",
""
]
] | This article aims at comparing gravitational wave memory effect in a Schwarzschild spacetime with that of other compact objects with static and spherically symmetric spacetime, with the purpose of proposing a procedure for differentiating between various compact object geometries. We do this by considering the relative... |
1610.04396 | Andrea Addazi AndAdd | Andrea Addazi | Brane Bounce from logarithmic entropic corrections in the bulk | null | null | 10.1142/S0217751X17501743 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate new corrections to the Brane-world dynamics, lying in a 5D
Schwarzschild-De Sitter black hole, generalizing the result of Nojiri, Odintsov
and Ogushi (NOO) in Ref.\cite{Nojiri:2002vu}, The NOO entropy effect is based
on the Logharitmic correction to the bulk entropy firstly calculated by
Mukherji and Pal... | [
{
"created": "Fri, 14 Oct 2016 10:23:37 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Addazi",
"Andrea",
""
]
] | We calculate new corrections to the Brane-world dynamics, lying in a 5D Schwarzschild-De Sitter black hole, generalizing the result of Nojiri, Odintsov and Ogushi (NOO) in Ref.\cite{Nojiri:2002vu}, The NOO entropy effect is based on the Logharitmic correction to the bulk entropy firstly calculated by Mukherji and Pal i... |
2308.01709 | Harsh Narola | Harsh Narola, Justin Janquart, Le\"ila Haegel, K. Haris, Otto A.
Hannuksela, Chris Van Den Broeck | How well can modified gravitational wave propagation be constrained with
strong lensing? | Arxiv submission | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Strong gravitational lensing produces multiple images of a gravitational wave
(GW) signal, which can be observed by detectors as time-separated copies of the
same event. It has been shown that under favourable circumstances, by combining
information from a quadruply lensed GW with electromagnetic observations of
lens... | [
{
"created": "Thu, 3 Aug 2023 12:08:02 GMT",
"version": "v1"
}
] | 2023-08-04 | [
[
"Narola",
"Harsh",
""
],
[
"Janquart",
"Justin",
""
],
[
"Haegel",
"Leïla",
""
],
[
"Haris",
"K.",
""
],
[
"Hannuksela",
"Otto A.",
""
],
[
"Broeck",
"Chris Van Den",
""
]
] | Strong gravitational lensing produces multiple images of a gravitational wave (GW) signal, which can be observed by detectors as time-separated copies of the same event. It has been shown that under favourable circumstances, by combining information from a quadruply lensed GW with electromagnetic observations of lensed... |
gr-qc/9704068 | N. K. Dadhich | Naresh Dadhich | On the Schwarzschild field | 19 pages, TeX version | null | null | IUCAA-33/97 | gr-qc | null | General relativity is a non-linear theory with the distinguishing feature
that gravitational field energy also acts as gravitational charge density. In
the well-known Schwarzschild solution describing field of an isolated massive
body at rest, the scalar function $\phi$ characterising the field acts as a
gravitationa... | [
{
"created": "Thu, 24 Apr 1997 12:05:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dadhich",
"Naresh",
""
]
] | General relativity is a non-linear theory with the distinguishing feature that gravitational field energy also acts as gravitational charge density. In the well-known Schwarzschild solution describing field of an isolated massive body at rest, the scalar function $\phi$ characterising the field acts as a gravitational ... |
2005.11609 | Jorge Ananias Neto | Everton M. C. Abreu, Jorge Ananias Neto and Ed\'esio M. Barboza Jr | Barrow's black hole entropy and the equipartition theorem | minor adjustments | null | 10.1209/0295-5075/130/40005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Barrow entropy appears from the fact that the black hole surface can be
modified due to quantum gravitational outcome. The measure of this perturbation
is given by a new exponent $\Delta$. In this letter we have shown that, from
the standard mathematical form of the equipartition theorem, we can relate it
with Ba... | [
{
"created": "Sat, 23 May 2020 22:05:37 GMT",
"version": "v1"
},
{
"created": "Tue, 26 May 2020 16:34:14 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jun 2020 19:58:16 GMT",
"version": "v3"
}
] | 2020-08-26 | [
[
"Abreu",
"Everton M. C.",
""
],
[
"Neto",
"Jorge Ananias",
""
],
[
"Barboza",
"Edésio M.",
"Jr"
]
] | The Barrow entropy appears from the fact that the black hole surface can be modified due to quantum gravitational outcome. The measure of this perturbation is given by a new exponent $\Delta$. In this letter we have shown that, from the standard mathematical form of the equipartition theorem, we can relate it with Barr... |
gr-qc/9804003 | Hideki Asada | Hideki Asada | Formulation for the internal motion of quasi-equilibrium configurations
in general relativity | 11 pages (RevTeX); accepted for publication in Phys. Rev. D | Phys.Rev. D57 (1998) 7292-7298 | 10.1103/PhysRevD.57.7292 | null | gr-qc | null | We present a formulation for the internal motion of equilibrium
configurations with a rotational Killing vector in general relativity. As an
approximation, this formulation is applicable to investigation of the internal
motion of quasi-equilibrium configurations such as binary neutron stars. Based
on this simple form... | [
{
"created": "Thu, 2 Apr 1998 06:05:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Asada",
"Hideki",
""
]
] | We present a formulation for the internal motion of equilibrium configurations with a rotational Killing vector in general relativity. As an approximation, this formulation is applicable to investigation of the internal motion of quasi-equilibrium configurations such as binary neutron stars. Based on this simple formul... |
2108.09524 | Pedro Labra\~na | Pedro Labra\~na and Juan Ortiz | Classically and Quantum Stable Emergent Universe in a Jordan-Brans-Dicke
Theory | 22 pages, 4 figures, changes in abstract and introduction,
improvements in the text and comments added in conclusions. References added | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The study of Emergent Universe models is based on the assumption that the
universe emerged from a past eternal Einstein Static (ES) state towards an
inflationary phase and then evolves into a hot big bang era. These models are
appealing since they provide specific examples of nonsingular (geodesically
complete) infla... | [
{
"created": "Sat, 21 Aug 2021 15:01:47 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Mar 2024 23:32:03 GMT",
"version": "v2"
}
] | 2024-03-18 | [
[
"Labraña",
"Pedro",
""
],
[
"Ortiz",
"Juan",
""
]
] | The study of Emergent Universe models is based on the assumption that the universe emerged from a past eternal Einstein Static (ES) state towards an inflationary phase and then evolves into a hot big bang era. These models are appealing since they provide specific examples of nonsingular (geodesically complete) inflati... |
gr-qc/9709007 | Carlo Del Noce | Carlo Del Noce, Giovanni Preti and Fernando de Felice (University of
Padova, Italy, and INFN, Sezione di Padova) | Coalescing binary systems of compact objects: Dynamics of angular
momenta | 22 pages, AASTeX and 13 figures in PostScript | The Astrophysical Journal, 507:287-299, 1998 November 1 | 10.1086/306295 | null | gr-qc astro-ph | null | The end state of a coalescing binary of compact objects depends strongly on
the final total mass M and angular momentum J. Since gravitational radiation
emission causes a slow evolution of the binary system through quasi-circular
orbits down to the innermost stable one, in this paper we examine the
corresponding beha... | [
{
"created": "Wed, 3 Sep 1997 18:34:30 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Dec 1998 12:26:02 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Del Noce",
"Carlo",
"",
"University of\n Padova, Italy, and INFN, Sezione di Padova"
],
[
"Preti",
"Giovanni",
"",
"University of\n Padova, Italy, and INFN, Sezione di Padova"
],
[
"de Felice",
"Fernando",
"",
"University of\n Padova, Italy, and INFN, Se... | The end state of a coalescing binary of compact objects depends strongly on the final total mass M and angular momentum J. Since gravitational radiation emission causes a slow evolution of the binary system through quasi-circular orbits down to the innermost stable one, in this paper we examine the corresponding behavi... |
1501.03538 | Merced Montesinos | Diego Gonz\'alez, Merced Montesinos | Gauge connection formulations for general relativity | No figures | Phys.Rev.D91:024021,2015 | 10.1103/PhysRevD.91.024021 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report a new class of $SO(3,\mathbb{C})$ and diffeomorphism invariant
formulations for general relativity with either a vanishing or a nonvanishing
cosmological constant, which depends functionally on a $SO(3,\mathbb{C})$ gauge
connection and a complex-valued 4-form via a holomorphic function of the trace
of a sym... | [
{
"created": "Wed, 14 Jan 2015 23:50:17 GMT",
"version": "v1"
}
] | 2015-01-16 | [
[
"González",
"Diego",
""
],
[
"Montesinos",
"Merced",
""
]
] | We report a new class of $SO(3,\mathbb{C})$ and diffeomorphism invariant formulations for general relativity with either a vanishing or a nonvanishing cosmological constant, which depends functionally on a $SO(3,\mathbb{C})$ gauge connection and a complex-valued 4-form via a holomorphic function of the trace of a symme... |
2301.09021 | Valerio Faraoni | Valerio Faraoni and Robert Vanderwee (Bishop's University) | Tolman-Ehrenfest's criterion of thermal equilibrium extended to
conformally static spacetimes | Section on cosmological black holes added, bibliography expanded.
Matches the version accepted in Phys. Rev. D | null | 10.1103/PhysRevD.107.064072 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With insight from examples and physical arguments, the Tolman-Ehrenfest
criterion of thermal equilibrium for test fluids in static spacetimes is
extended to local thermal equilibrium in conformally static geometries. The
temperature of the conformally rescaled fluid scales with the inverse of the
conformal factor, re... | [
{
"created": "Sat, 21 Jan 2023 22:29:10 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Mar 2023 00:57:23 GMT",
"version": "v2"
}
] | 2023-04-12 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
],
[
"Vanderwee",
"Robert",
"",
"Bishop's University"
]
] | With insight from examples and physical arguments, the Tolman-Ehrenfest criterion of thermal equilibrium for test fluids in static spacetimes is extended to local thermal equilibrium in conformally static geometries. The temperature of the conformally rescaled fluid scales with the inverse of the conformal factor, repr... |
1310.5976 | Peter Van | P. V\'an and T.S. Bir\'o | Thermodynamics and flow-frames for dissipative relativistic fluids | 9 pages | Proceedings of the V Leopoldo Garc\'ia-Col\'in Mexican Meeting on
Mathematical and Experimental Physics, 2014, V1578 AIP Conf. Proc., p114-121 | 10.1063/1.4862456 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general thermodynamic treatment of dissipative relativistic fluids is
introduced, where the temperature four vector is not parallel to the velocity
field of the fluid. Generic stability and kinetic equilibrium points out a
particular thermodynamics, where the temperature vector is parallel to the
enthalpy flow vect... | [
{
"created": "Tue, 22 Oct 2013 16:23:26 GMT",
"version": "v1"
}
] | 2014-05-27 | [
[
"Ván",
"P.",
""
],
[
"Biró",
"T. S.",
""
]
] | A general thermodynamic treatment of dissipative relativistic fluids is introduced, where the temperature four vector is not parallel to the velocity field of the fluid. Generic stability and kinetic equilibrium points out a particular thermodynamics, where the temperature vector is parallel to the enthalpy flow vector... |
1608.02882 | Jean-Pierre Lasota | M.A. Abramowicz and J.-P. Lasota | No repulsive force in General Relativity | 2 pages, submitted to MNRAS Letters | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a recent assertion [arXiv:1608.01541] that gravitational wave
emission can lead to a repulsive force explaining the accelerated expansion of
the Universe is totally unfounded.
| [
{
"created": "Mon, 8 Aug 2016 16:06:10 GMT",
"version": "v1"
}
] | 2016-08-11 | [
[
"Abramowicz",
"M. A.",
""
],
[
"Lasota",
"J. -P.",
""
]
] | We show that a recent assertion [arXiv:1608.01541] that gravitational wave emission can lead to a repulsive force explaining the accelerated expansion of the Universe is totally unfounded. |
2302.11229 | Khalil El Bourakadi | K. El Bourakadi, Z. Sakhi, M. Bennai | Observational constraints on Tachyon inflation and reheating in f(Q)
gravity | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work we study one of the most appealing string theory-motivated
models, we present a tachyonic inflationary model in the recently proposed
symmetric teleparallel framework, and examine constraints on tachyon inflation
with the exponential potential along with the reheating for a chosen $f(Q)$
gravity model. C... | [
{
"created": "Wed, 22 Feb 2023 09:18:57 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2023 19:04:34 GMT",
"version": "v2"
}
] | 2023-02-27 | [
[
"Bourakadi",
"K. El",
""
],
[
"Sakhi",
"Z.",
""
],
[
"Bennai",
"M.",
""
]
] | In this work we study one of the most appealing string theory-motivated models, we present a tachyonic inflationary model in the recently proposed symmetric teleparallel framework, and examine constraints on tachyon inflation with the exponential potential along with the reheating for a chosen $f(Q)$ gravity model. Con... |
1711.10721 | Debabrata Deb | Debabrata Deb, Farook Rahaman, Saibal Ray and B.K. Guha | Strange stars in $f(R,\mathcal{T})$ gravity | 20 pages, 9 figures, 2 tables, Major revisions | JCAP03(2018)044 | 10.1088/1475-7516/2018/03/044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we try to present spherically symmetric isotropic strange
star model under the framework of $f(R,\mathcal{T})$ theory of gravity. To this
end, we consider that the Lagrangian density is an arbitrary linear function of
the Ricci scalar $R$ and the trace of the energy momentum tensor~$\mathcal{T}$
given... | [
{
"created": "Wed, 29 Nov 2017 08:23:22 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Apr 2018 17:56:13 GMT",
"version": "v2"
}
] | 2018-04-23 | [
[
"Deb",
"Debabrata",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Ray",
"Saibal",
""
],
[
"Guha",
"B. K.",
""
]
] | In this article we try to present spherically symmetric isotropic strange star model under the framework of $f(R,\mathcal{T})$ theory of gravity. To this end, we consider that the Lagrangian density is an arbitrary linear function of the Ricci scalar $R$ and the trace of the energy momentum tensor~$\mathcal{T}$ given a... |
gr-qc/0002071 | Israel Quiroz | Israel Quiros, Rolando Cardenas and Rolando Bonal (Departamento de
Fisica. Universidad Central de Las Villas. Santa Clara. Cuba) | Open universes and avoidance of the cosmological singularity | 11 pages, latex, no figures, submitted to PRD. New important
arguments have been added. Correspondingly the abstract has been enlarged.
The content of the paper is now split into sections | null | null | null | gr-qc | null | In the present paper we give conclusive arguments pointing at physical
equivalence among conformally related metrics. Based on the argument that any
consistent effective theory of spacetime must be invariant under the
one-parameter group of transformations of the units of length, time and
reciprocal mass, it is shown... | [
{
"created": "Mon, 21 Feb 2000 20:09:53 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2000 17:55:33 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Apr 2000 19:36:10 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Quiros",
"Israel",
"",
"Departamento de\n Fisica. Universidad Central de Las Villas. Santa Clara. Cuba"
],
[
"Cardenas",
"Rolando",
"",
"Departamento de\n Fisica. Universidad Central de Las Villas. Santa Clara. Cuba"
],
[
"Bonal",
"Rolando",
"",
"Departam... | In the present paper we give conclusive arguments pointing at physical equivalence among conformally related metrics. Based on the argument that any consistent effective theory of spacetime must be invariant under the one-parameter group of transformations of the units of length, time and reciprocal mass, it is shown, ... |
gr-qc/0312051 | Andreas K\"allberg | A. K\"allberg, G. Brodin, M. Bradley | Nonlinear coupled Alfv\'{e}n and gravitational waves | 20 pages, revtex4, accepted in PRD | Phys.Rev. D70 (2004) 044014 | 10.1103/PhysRevD.70.044014 | null | gr-qc astro-ph | null | In this paper we consider nonlinear interaction between gravitational and
electromagnetic waves in a strongly magnetized plasma. More specifically, we
investigate the propagation of gravitational waves with the direction of
propagation perpendicular to a background magnetic field, and the coupling to
compressional Al... | [
{
"created": "Tue, 9 Dec 2003 13:02:46 GMT",
"version": "v1"
},
{
"created": "Mon, 24 May 2004 08:22:34 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Källberg",
"A.",
""
],
[
"Brodin",
"G.",
""
],
[
"Bradley",
"M.",
""
]
] | In this paper we consider nonlinear interaction between gravitational and electromagnetic waves in a strongly magnetized plasma. More specifically, we investigate the propagation of gravitational waves with the direction of propagation perpendicular to a background magnetic field, and the coupling to compressional Alfv... |
gr-qc/0701006 | Ralf Lehnert | Ralf Lehnert | Quantum gravity and spacetime symmetries | 3 pages; Presented at 11th Marcel Grossmann Meeting on Recent
Developments in Theoretical and Experimental General Relativity, Gravitation,
and Relativistic Field Theories, Berlin, Germany, 23-29 Jul 2006 | null | null | MIT-CTP-3801 | gr-qc | null | Small violations of spacetime symmetries have recently been identified as
promising Planck-scale signals. This talk reviews how such violations can arise
in various approaches to quantum gravity, how the emergent low-energy effects
can be described within the framework of relativistic effective field theories,
how su... | [
{
"created": "Sat, 30 Dec 2006 19:49:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lehnert",
"Ralf",
""
]
] | Small violations of spacetime symmetries have recently been identified as promising Planck-scale signals. This talk reviews how such violations can arise in various approaches to quantum gravity, how the emergent low-energy effects can be described within the framework of relativistic effective field theories, how suit... |
gr-qc/0612179 | Alikram Aliev | Alikram N. Aliev and Cihan Saclioglu | Self-Dual Fields on the space of a Kerr-Taub-bolt Instanton | 3 pages, to appear in the Proceedings of the Eleventh Marcel
Grossmann Meeting, Berlin, Germany, 23-29 Jule 2006, World Scientific,
Singapore (2007) | null | null | null | gr-qc | null | We discuss a new exact solution for self-dual Abelian gauge fields living on
the space of the Kerr-Taub-bolt instanton, which is a generalized example of
asymptotically flat instantons with non-self-dual curvature.
| [
{
"created": "Thu, 28 Dec 2006 10:22:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aliev",
"Alikram N.",
""
],
[
"Saclioglu",
"Cihan",
""
]
] | We discuss a new exact solution for self-dual Abelian gauge fields living on the space of the Kerr-Taub-bolt instanton, which is a generalized example of asymptotically flat instantons with non-self-dual curvature. |
0711.1996 | Shahram Jalalzadeh | P. Pedram and S. Jalalzadeh | Quantum FRW cosmological solutions in the presence of Chaplygin gas and
perfect fluid | 18 pages, 2 figures, to appear in PLB | Phys.Lett.B659:6-13,2008 | 10.1016/j.physletb.2007.11.013 | null | gr-qc | null | We present a Friedmann-Robertson-Walker quantum cosmological model in the
presence of Chaplygin gas and perfect fluid for early and late time epoches. In
this work, we consider perfect fluid as an effective potential and apply
Schutz's variational formalism to the Chaplygin gas which recovers the notion
of time. Thes... | [
{
"created": "Tue, 13 Nov 2007 14:51:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pedram",
"P.",
""
],
[
"Jalalzadeh",
"S.",
""
]
] | We present a Friedmann-Robertson-Walker quantum cosmological model in the presence of Chaplygin gas and perfect fluid for early and late time epoches. In this work, we consider perfect fluid as an effective potential and apply Schutz's variational formalism to the Chaplygin gas which recovers the notion of time. These ... |
1801.02661 | Juliano Neves | R. V. Maluf, Juliano C. S. Neves | Thermodynamics of a class of regular black holes with a generalized
uncertainty principle | 8 pages, 1 figure. Version with corrected typos. Accepted in Physical
Review D | Phys. Rev. D 97, 104015 (2018) | 10.1103/PhysRevD.97.104015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we present a study on thermodynamics of a class of regular
black holes. Such a class includes Bardeen and Hayward regular black holes. We
obtained thermodynamic quantities like the Hawking temperature, entropy, and
heat capacity for the entire class. As part of an effort to indicate some
physical obs... | [
{
"created": "Mon, 8 Jan 2018 19:54:05 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2018 14:52:59 GMT",
"version": "v2"
}
] | 2018-05-15 | [
[
"Maluf",
"R. V.",
""
],
[
"Neves",
"Juliano C. S.",
""
]
] | In this article, we present a study on thermodynamics of a class of regular black holes. Such a class includes Bardeen and Hayward regular black holes. We obtained thermodynamic quantities like the Hawking temperature, entropy, and heat capacity for the entire class. As part of an effort to indicate some physical obser... |
gr-qc/0607138 | Muhammad Sharif | M. Sharif and M. Jamil Amir | Teleparallel Versions of Friedmann and Lewis-Papapetrou Spacetimes | 13 pages, accepted for publication in GRG | Gen.Rel.Grav. 38 (2006) 1735-1745 | 10.1007/s10714-006-0354-6 | null | gr-qc | null | This paper is devoted to investigate the teleparallel versions of the
Friedmann models as well as the Lewis-Papapetrou solution. We obtain the tetrad
and the torsion fields for both the spacetimes. It is shown that the
axial-vector vanishes for the Friedmann models. We discuss the different
possibilities of the axial... | [
{
"created": "Mon, 31 Jul 2006 13:01:28 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Sharif",
"M.",
""
],
[
"Amir",
"M. Jamil",
""
]
] | This paper is devoted to investigate the teleparallel versions of the Friedmann models as well as the Lewis-Papapetrou solution. We obtain the tetrad and the torsion fields for both the spacetimes. It is shown that the axial-vector vanishes for the Friedmann models. We discuss the different possibilities of the axial-v... |
2011.03548 | Barry Wardell | Barry Wardell, Chris Kavanagh | Separable electromagnetic perturbations of rotating black holes | Minor typos corrected | Phys. Rev. D 103, 104049 (2021) | 10.1103/PhysRevD.103.104049 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify a set of Hertz potentials for solutions to the vector wave
equation on black hole spacetimes. The Hertz potentials yield Lorenz gauge
electromagnetic vector potentials that represent physical solutions to the
Maxwell equations, satisfy the Teukolsky equation, and are related to the
Maxwell scalars by stra... | [
{
"created": "Fri, 6 Nov 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Nov 2020 11:25:10 GMT",
"version": "v2"
},
{
"created": "Wed, 15 May 2024 16:48:48 GMT",
"version": "v3"
}
] | 2024-05-16 | [
[
"Wardell",
"Barry",
""
],
[
"Kavanagh",
"Chris",
""
]
] | We identify a set of Hertz potentials for solutions to the vector wave equation on black hole spacetimes. The Hertz potentials yield Lorenz gauge electromagnetic vector potentials that represent physical solutions to the Maxwell equations, satisfy the Teukolsky equation, and are related to the Maxwell scalars by straig... |
0810.3558 | Lucy MacNay | Lucy Macnay | Dynamics of Solutions of $f(R)$ Theory | 34 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the correspondence between the $f(R)$ theory and an Einstein-scalar
field system to study late-time dynamics of solutions of $f(R)$ theory. We
discuss how reasonable assumptions on the potential of the scalar field lead to
restrictions on the function $f(R)$ and use known results for the scalar field
system to... | [
{
"created": "Mon, 20 Oct 2008 14:00:10 GMT",
"version": "v1"
}
] | 2008-10-21 | [
[
"Macnay",
"Lucy",
""
]
] | We use the correspondence between the $f(R)$ theory and an Einstein-scalar field system to study late-time dynamics of solutions of $f(R)$ theory. We discuss how reasonable assumptions on the potential of the scalar field lead to restrictions on the function $f(R)$ and use known results for the scalar field system to g... |
gr-qc/0309036 | Gregory V. Vereshchagin | G.V. Vereshchagin | On the problem of cosmological singularity within gauge theories of
gravitation | 3 pages | null | null | null | gr-qc | null | In this note I discuss the problem of cosmological singularities within gauge
theories of gravitation. Solutions of cosmological equations with the scalar
field are considered.
| [
{
"created": "Sat, 6 Sep 2003 13:04:31 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Dec 2003 09:20:39 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Jun 2004 16:51:44 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Vereshchagin",
"G. V.",
""
]
] | In this note I discuss the problem of cosmological singularities within gauge theories of gravitation. Solutions of cosmological equations with the scalar field are considered. |
1901.05762 | Ramil Izmailov N | R.Kh. Karimov, R.N. Izmailov and K.K. Nandi | Accretion disk around the rotating Damour-Solodukhin wormhole | 9 pages, 3 tables, 13 figures | Eur. Phys. J. C 79, 952 (2019) | 10.1140/epjc/s10052-019-7488-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new rotating generalization of the Damour-Solodukhin wormhole (RDSWH),
called Kerr-like wormhole, has recently been proposed and investigated by Bueno
\textit{et al} for echoes in the gravitational wave signal. We show a novel
feature of the RDSWH, viz., that the kinematic properties such as the ISCO\ or
marginally... | [
{
"created": "Thu, 17 Jan 2019 12:39:20 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2019 12:43:09 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Aug 2019 13:01:26 GMT",
"version": "v3"
},
{
"created": "Tue, 4 Feb 2020 06:36:22 GMT",
"version": "v4"
}
] | 2020-02-05 | [
[
"Karimov",
"R. Kh.",
""
],
[
"Izmailov",
"R. N.",
""
],
[
"Nandi",
"K. K.",
""
]
] | A new rotating generalization of the Damour-Solodukhin wormhole (RDSWH), called Kerr-like wormhole, has recently been proposed and investigated by Bueno \textit{et al} for echoes in the gravitational wave signal. We show a novel feature of the RDSWH, viz., that the kinematic properties such as the ISCO\ or marginally s... |
2407.01385 | Richard Henriksen | R N Henriksen, A G Emslie | An Event Horizon 'Firewall' Undergoing Cosmological Expansion | 25 pages, eight figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We embed an object with a singular horizon structure, reminiscent of (but
fundamentally different from, except in a limiting case) a black-hole event
horizon, in an expanding, spherically symmetric, homogeneous, Universe that has
a positive cosmological constant. Conformal representation is discussed. There
is a temp... | [
{
"created": "Mon, 1 Jul 2024 15:35:25 GMT",
"version": "v1"
}
] | 2024-07-02 | [
[
"Henriksen",
"R N",
""
],
[
"Emslie",
"A G",
""
]
] | We embed an object with a singular horizon structure, reminiscent of (but fundamentally different from, except in a limiting case) a black-hole event horizon, in an expanding, spherically symmetric, homogeneous, Universe that has a positive cosmological constant. Conformal representation is discussed. There is a temper... |
2001.00031 | Klaus Liegener Dr | Klaus Liegener, Stefan Andreas Weigl | Effective LQC model for k=+1 isotropic cosmologies from spatial
discretisations | 19 pages, 4 figures | Phys. Rev. D 102, (2020) no. 106014 | 10.1103/PhysRevD.102.106014 | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The closed, spatially isotropic FLRW universe (k=+1) is endowed with
modifications due to a discrete underlying space-structure. Motivated from Loop
Quantum Gravity techniques, a full Thiemann regularisation is performed. The
impact of these modifications of the single-graph-sector appearing in the
scalar constraint ... | [
{
"created": "Tue, 31 Dec 2019 19:00:13 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Mar 2021 05:54:06 GMT",
"version": "v2"
}
] | 2021-03-22 | [
[
"Liegener",
"Klaus",
""
],
[
"Weigl",
"Stefan Andreas",
""
]
] | The closed, spatially isotropic FLRW universe (k=+1) is endowed with modifications due to a discrete underlying space-structure. Motivated from Loop Quantum Gravity techniques, a full Thiemann regularisation is performed. The impact of these modifications of the single-graph-sector appearing in the scalar constraint ar... |
2102.13551 | Matt Visser | Prado Martin-Moruno (Complutense de Madrid) and Matt Visser (Victoria
University of Wellington) | Hawking-Ellis classification of stress-energy: test-fields versus
back-reaction | V1: 30 pages; V2: minor typos fixed; no physics changes | Phys. Rev. D 103, 124003 (2021) | 10.1103/PhysRevD.103.124003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Hawking-Ellis (Segre-Plebanski) classification of
stress-energy tensors, both in the test-field limit, and in the presence of
back-reaction governed by the usual Einstein equations. For test fields it is
not too difficult to get a type~IV stress-energy via quantum vacuum
polarization effects. (For exa... | [
{
"created": "Fri, 26 Feb 2021 15:42:49 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Mar 2021 05:35:37 GMT",
"version": "v2"
}
] | 2021-06-09 | [
[
"Martin-Moruno",
"Prado",
"",
"Complutense de Madrid"
],
[
"Visser",
"Matt",
"",
"Victoria\n University of Wellington"
]
] | We consider the Hawking-Ellis (Segre-Plebanski) classification of stress-energy tensors, both in the test-field limit, and in the presence of back-reaction governed by the usual Einstein equations. For test fields it is not too difficult to get a type~IV stress-energy via quantum vacuum polarization effects. (For examp... |
2407.01961 | Sara Saghafi | Kourosh Nozari, Sara Saghafi and Milad Hajebrahimi | Extended Uncertainty Principle: A Deeper Insight into the Hubble
Tension? | 13 pages, 2 figures, 4 tables Accepted for Publication in Physics of
the Dark Universe | Physics of the Dark Universe (2024) | 10.1016/j.dark.2024.101571 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The standard cosmological model, known as the LambdaCDM model, has been
successful in many respects, but it has some significant discrepancies, some of
which have not been resolved yet. In measuring the Hubble-Lematre parameter,
there is an apparent discrepancy which is known as the Hubble tension, defined
as differe... | [
{
"created": "Tue, 2 Jul 2024 05:33:08 GMT",
"version": "v1"
}
] | 2024-07-10 | [
[
"Nozari",
"Kourosh",
""
],
[
"Saghafi",
"Sara",
""
],
[
"Hajebrahimi",
"Milad",
""
]
] | The standard cosmological model, known as the LambdaCDM model, has been successful in many respects, but it has some significant discrepancies, some of which have not been resolved yet. In measuring the Hubble-Lematre parameter, there is an apparent discrepancy which is known as the Hubble tension, defined as differenc... |
2209.10612 | Amir-Pouyan Khosravi | Alfio Bonanno, Amir-Pouyan Khosravi, Frank Saueressig | Regular evaporating black holes with stable cores | 17 pages, 9 figures | null | 10.1103/PhysRevD.107.024005 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | A feature shared by many regular black hole spacetimes is the occurrence of a
Cauchy horizon. It is then commonly believed that this renders the geometry
unstable against perturbations through the mass-inflation effect. In this work,
we perform the first dynamical study of this effect taking into account the
mass-los... | [
{
"created": "Wed, 21 Sep 2022 19:15:46 GMT",
"version": "v1"
}
] | 2023-01-18 | [
[
"Bonanno",
"Alfio",
""
],
[
"Khosravi",
"Amir-Pouyan",
""
],
[
"Saueressig",
"Frank",
""
]
] | A feature shared by many regular black hole spacetimes is the occurrence of a Cauchy horizon. It is then commonly believed that this renders the geometry unstable against perturbations through the mass-inflation effect. In this work, we perform the first dynamical study of this effect taking into account the mass-loss ... |
2109.08146 | Kevin Croker | Kevin S. Croker, Michael J. Zevin, Duncan Farrah, Kurtis A. Nishimura,
Gregory Tarle | Cosmologically coupled compact objects: a single parameter model for
LIGO--Virgo mass and redshift distributions | 8 pages, 2 figures. Submitted to ApJL | null | 10.3847/2041-8213/ac2fad | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate a single-parameter route for reproducing higher mass objects
as observed in the LIGO--Virgo mass distribution, using only the isolated
binary stellar evolution channel. This single parameter encodes the
cosmological mass growth of compact stellar remnants that exceed the
Tolman-Oppenheimer-Volkoff limi... | [
{
"created": "Wed, 15 Sep 2021 18:00:03 GMT",
"version": "v1"
}
] | 2021-11-17 | [
[
"Croker",
"Kevin S.",
""
],
[
"Zevin",
"Michael J.",
""
],
[
"Farrah",
"Duncan",
""
],
[
"Nishimura",
"Kurtis A.",
""
],
[
"Tarle",
"Gregory",
""
]
] | We demonstrate a single-parameter route for reproducing higher mass objects as observed in the LIGO--Virgo mass distribution, using only the isolated binary stellar evolution channel. This single parameter encodes the cosmological mass growth of compact stellar remnants that exceed the Tolman-Oppenheimer-Volkoff limit.... |
gr-qc/0211075 | Philippe Grandclement | P. Grandclement and V. Kalogera | Searching for Gravitational Waves from the Inspiral of Precessing Binary
Systems: New Hierarchical Scheme using "Spiky" Templates | 17 pages, 22 figures, version accepted by PRD. Minor revisions | Phys.Rev. D67 (2003) 082002 | 10.1103/PhysRevD.67.082002 | null | gr-qc astro-ph | null | In a recent investigation of the effects of precession on the anticipated
detection of gravitational-wave inspiral signals from compact object binaries
with moderate total masses, we found that (i) if precession is ignored, the
inspiral detection rate can decrease by almost a factor of 10, and (ii)
previously propose... | [
{
"created": "Fri, 22 Nov 2002 22:30:14 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jan 2003 17:08:25 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Grandclement",
"P.",
""
],
[
"Kalogera",
"V.",
""
]
] | In a recent investigation of the effects of precession on the anticipated detection of gravitational-wave inspiral signals from compact object binaries with moderate total masses, we found that (i) if precession is ignored, the inspiral detection rate can decrease by almost a factor of 10, and (ii) previously proposed ... |
2107.05614 | Kouji Nakamura | Kouji Nakamura | Quantum noise and vacuum fluctuations in balanced homodyne detections
through ideal multi-mode detectors | 39 pages, 5 figures, This is the full paper version of
[arXiv:2101.11838 [gr-qc]] (v1); Acknowledgements is added (v2); Minor
changes in Sec.1, Sec.6, Fig.3, and Fig.A2. Some typos are corrected (v3) | Prog. Theor. Exp. Phys. 2021, 103A01 (38 pages) | 10.1093/ptep/ptab113 | null | gr-qc astro-ph.IM quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The balanced homodyne detection as a readout scheme of gravitational-wave
detectors is carefully examined from the quantum field theoretical point of
view. The readout scheme in gravitational-wave detectors specifies the directly
measured quantum operator in the detection. This specification is necessary
when we appl... | [
{
"created": "Mon, 12 Jul 2021 17:48:58 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Jul 2021 13:17:04 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Aug 2021 10:29:19 GMT",
"version": "v3"
}
] | 2021-10-27 | [
[
"Nakamura",
"Kouji",
""
]
] | The balanced homodyne detection as a readout scheme of gravitational-wave detectors is carefully examined from the quantum field theoretical point of view. The readout scheme in gravitational-wave detectors specifies the directly measured quantum operator in the detection. This specification is necessary when we apply ... |
1808.02798 | Thiago R.P. Caram\^es | Thiago R. P. Caram\^es, H. Velten, J. C. Fabris and Matheus J. Lazo | Dark energy with zero pressure: Accelerated expansion and large scale
structure in action-dependent Lagrangian theories | 8 pages, 7 figures. Revised version: Title slightly changed, typos
corrected, more discussion added. Matches the published version in PRD | Phys. Rev. D 98, 103501 (2018) | 10.1103/PhysRevD.98.103501 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a cosmological model based on action-dependent Lagrangian
theories. The main feature here is the nonconservation of the energy momentum
tensor due to the nontrivial geometrical construction of the theory. We provide
the basic set of equations necessary to study both the cosmological background
expansion as... | [
{
"created": "Wed, 8 Aug 2018 14:37:12 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Nov 2018 19:36:52 GMT",
"version": "v2"
}
] | 2018-11-05 | [
[
"Caramês",
"Thiago R. P.",
""
],
[
"Velten",
"H.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Lazo",
"Matheus J.",
""
]
] | We develop a cosmological model based on action-dependent Lagrangian theories. The main feature here is the nonconservation of the energy momentum tensor due to the nontrivial geometrical construction of the theory. We provide the basic set of equations necessary to study both the cosmological background expansion as w... |
1807.04580 | Manuel Hohmann | Manuel Hohmann, Martin Kr\v{s}\v{s}\'ak, Christian Pfeifer, Ulbossyn
Ualikhanova | Propagation of gravitational waves in teleparallel gravity theories | 11 pages, 1 figure; updated references to match published version.
arXiv admin note: substantial text overlap with arXiv:1808.02894 | Phys. Rev. D 98, 124004 (2018) | 10.1103/PhysRevD.98.124004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate propagation of gravitational waves in the most general
teleparallel gravity model with second order field equations around the
Minkowski background. We argue that in this case the most general Lagrangian at
the first order of perturbations is given by the linear combination of
quadratic invariants and ... | [
{
"created": "Thu, 12 Jul 2018 12:46:36 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jul 2020 20:36:08 GMT",
"version": "v2"
}
] | 2020-07-08 | [
[
"Hohmann",
"Manuel",
""
],
[
"Krššák",
"Martin",
""
],
[
"Pfeifer",
"Christian",
""
],
[
"Ualikhanova",
"Ulbossyn",
""
]
] | We investigate propagation of gravitational waves in the most general teleparallel gravity model with second order field equations around the Minkowski background. We argue that in this case the most general Lagrangian at the first order of perturbations is given by the linear combination of quadratic invariants and he... |
gr-qc/0308030 | Piechocki Wlodzimierz | Wlodzimierz Piechocki | Quantum particle on hyperboloid | 7 pages, no figures, revtex4 | Class.Quant.Grav. 21 (2004) 331-336 | 10.1088/0264-9381/21/1/024 | null | gr-qc hep-th math-ph math.MP quant-ph | null | We present quantization of particle dynamics on one-sheet hyperboloid
embedded in three dimensional Minkowski space. Taking account of all global
symmetries enables unique quantization. Making use of topology of canonical
variables not only simplifies calculations but also gives proper framework for
analysis.
| [
{
"created": "Mon, 11 Aug 2003 12:39:05 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Piechocki",
"Wlodzimierz",
""
]
] | We present quantization of particle dynamics on one-sheet hyperboloid embedded in three dimensional Minkowski space. Taking account of all global symmetries enables unique quantization. Making use of topology of canonical variables not only simplifies calculations but also gives proper framework for analysis. |
2305.19485 | Jos\'e Villanueva | Mohsen Fathi, Mart\'in Molina, J.R. Villanueva | Carath\'eodory's thermodynamics of the Schwarzschild black hole
surrounded by quintessence | 9 pages, 7 figures | null | 10.1088/1402-4896/acd886 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we apply the Carath\'eodory's method of geometrothermodynamics
to investigate the behavior of the main thermodynamic parameters associated
with a Schwarzschild black hole surrounded by quintessence. The corresponding
Pfaffian form is constructed by means of the Schwarzschild radius $r_s$, and
the quint... | [
{
"created": "Wed, 31 May 2023 01:43:37 GMT",
"version": "v1"
}
] | 2023-06-01 | [
[
"Fathi",
"Mohsen",
""
],
[
"Molina",
"Martín",
""
],
[
"Villanueva",
"J. R.",
""
]
] | In this paper, we apply the Carath\'eodory's method of geometrothermodynamics to investigate the behavior of the main thermodynamic parameters associated with a Schwarzschild black hole surrounded by quintessence. The corresponding Pfaffian form is constructed by means of the Schwarzschild radius $r_s$, and the quintes... |
gr-qc/9707034 | null | M. Gasperini | Testing string cosmology with gravity wave detectors | 13 pages, LATEX, three figures included using EPSFIG. Talk given at
the "Second Edoardo Amaldi Conference on Gravitational Wawes" (CERN, 1-4 July
1997). To be published in the Proceedings (World Scientific, Singapore), eds
E. Coccia et al. An updated collection of papers on the pre-big bang scenario
is availabl... | null | null | DFTT-43/97 | gr-qc astro-ph hep-ph hep-th | null | The general properties of the gravity wave backgrounds of cosmological origin
are reviewed and briefly discussed, with emphasis on the relic background
expected from an early pre-big bang phase typical of string cosmology models.
| [
{
"created": "Tue, 15 Jul 1997 15:11:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gasperini",
"M.",
""
]
] | The general properties of the gravity wave backgrounds of cosmological origin are reviewed and briefly discussed, with emphasis on the relic background expected from an early pre-big bang phase typical of string cosmology models. |
gr-qc/0312113 | George Izmailov Nickolaevich | A.I. Golovashkin, G.N. Izmailov, G.V. Kuleshova, A.M. Tzhovrebov, Tran
Quoc Khanh | Detection of Weak Gravitational Waves by Interferometric Methods and
Problem of Invertible Calculations | 12 pages, 5 figures, presented at Moscow Satellite PIRT Meeting (30
June - 03 July 2003) | null | null | null | gr-qc | null | The fundamental features of the detection of non-stationary undulatory
perturbations of metrics based on the interference effects are considered. The
advantage of the Aharonov-Bohm effect in superconductors for these purposes in
comparison with the ordinary optical interference is demonstrated. Some
circuitries of th... | [
{
"created": "Fri, 26 Dec 2003 18:16:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Golovashkin",
"A. I.",
""
],
[
"Izmailov",
"G. N.",
""
],
[
"Kuleshova",
"G. V.",
""
],
[
"Tzhovrebov",
"A. M.",
""
],
[
"Khanh",
"Tran Quoc",
""
]
] | The fundamental features of the detection of non-stationary undulatory perturbations of metrics based on the interference effects are considered. The advantage of the Aharonov-Bohm effect in superconductors for these purposes in comparison with the ordinary optical interference is demonstrated. Some circuitries of the ... |
1703.06898 | Tommi Markkanen | Tommi Markkanen | De Sitter Stability and Coarse Graining | v6: added an appendix giving details on mode normalization | Eur. Phys. J. C (2018) 78: 97 | 10.1140/epjc/s10052-018-5575-9 | KCL-PH-TH/2017-14, IMPERIAL/TP/2018/TM/01 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a 4-dimensional back reaction analysis of de Sitter space for a
conformally coupled scalar field in the presence of vacuum energy initialized
in the Bunch-Davies vacuum. In contrast to the usual semi-classical
prescription, as the source term in the Friedmann equations we use expectation
values where the u... | [
{
"created": "Mon, 20 Mar 2017 18:10:08 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2017 23:53:35 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Apr 2017 21:33:12 GMT",
"version": "v3"
},
{
"created": "Fri, 25 Aug 2017 18:27:04 GMT",
"version": "v4"
},
{
"c... | 2018-09-25 | [
[
"Markkanen",
"Tommi",
""
]
] | We present a 4-dimensional back reaction analysis of de Sitter space for a conformally coupled scalar field in the presence of vacuum energy initialized in the Bunch-Davies vacuum. In contrast to the usual semi-classical prescription, as the source term in the Friedmann equations we use expectation values where the uno... |
1710.10615 | Robert Bluhm | Robert Bluhm | Gravity Theories with Background Fields and Spacetime Symmetry Breaking | null | Symmetry 9, 230 (2017) | 10.3390/sym9100230 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An overview is given of effective gravitational field theories with fixed
background fields that break spacetime symmetry. The behavior of the background
fields and the types of excitations that can occur depend on whether the
symmetry breaking is explicit or spontaneous. For example, when the breaking is
spontaneous... | [
{
"created": "Sun, 29 Oct 2017 13:44:09 GMT",
"version": "v1"
}
] | 2017-10-31 | [
[
"Bluhm",
"Robert",
""
]
] | An overview is given of effective gravitational field theories with fixed background fields that break spacetime symmetry. The behavior of the background fields and the types of excitations that can occur depend on whether the symmetry breaking is explicit or spontaneous. For example, when the breaking is spontaneous, ... |
1410.5763 | Steven Carlip | S. Carlip | A Note on Black Hole Entropy in Loop Quantum Gravity | v2: added references; v3: slight addition to discussion of 3d
gravity; v4: more references, typos fixed | null | 10.1088/0264-9381/32/15/155009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several recent results have hinted that black hole thermodynamics in loop
quantum gravity simplifies if one chooses an imaginary Barbero-Immirzi
parameter $\gamma=i$. This suggests a connection with
$\mathrm{SL}(2,\mathbb{C})$ or $\mathrm{SL}(2,\mathbb{R})$ conformal field
theories at the "boundaries" formed by spin ... | [
{
"created": "Tue, 21 Oct 2014 17:59:38 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2014 20:24:18 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Mar 2015 21:29:57 GMT",
"version": "v3"
},
{
"created": "Fri, 29 May 2015 20:42:32 GMT",
"version": "v4"
}
] | 2015-08-06 | [
[
"Carlip",
"S.",
""
]
] | Several recent results have hinted that black hole thermodynamics in loop quantum gravity simplifies if one chooses an imaginary Barbero-Immirzi parameter $\gamma=i$. This suggests a connection with $\mathrm{SL}(2,\mathbb{C})$ or $\mathrm{SL}(2,\mathbb{R})$ conformal field theories at the "boundaries" formed by spin ne... |
1310.1171 | Md. Farid Ahmed | Md. Farid Ahmed, Brendan M. Quine, Spiros Pagiatakis and A. D.
Stauffer (York University, Toronto, Canada) | Results of a one-way experiment to test the isotropy of the speed of
light | 13 pages, 9 figures. arXiv admin note: text overlap with
arXiv:1103.6086 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents the outcome of an experiment based on an improved version
of Fizeau's coupled-slotted-discs that tests the fundamental postulates of
Special Relativity for the one-way speed of light propagation. According to our
methodology, important phenomena - a limit on and the diurnal regularity of the
varia... | [
{
"created": "Fri, 4 Oct 2013 05:27:17 GMT",
"version": "v1"
}
] | 2013-10-07 | [
[
"Ahmed",
"Md. Farid",
"",
"York University, Toronto, Canada"
],
[
"Quine",
"Brendan M.",
"",
"York University, Toronto, Canada"
],
[
"Pagiatakis",
"Spiros",
"",
"York University, Toronto, Canada"
],
[
"Stauffer",
"A. D.",
"",
"York Univer... | This paper presents the outcome of an experiment based on an improved version of Fizeau's coupled-slotted-discs that tests the fundamental postulates of Special Relativity for the one-way speed of light propagation. According to our methodology, important phenomena - a limit on and the diurnal regularity of the variati... |
1110.3668 | Hossein Farajollahi | H. Farajollahi, F. Tayebi, F. Milani, M. Enayati | Cosmological observations in non-local $F(R)$ cosmology | 12 pages, 7 figures, will be published in Astrophysics and space
science | Astrophysics and Space Science, 337, 2 773-778 (2012) | 10.1007/s10509-011-0889-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article in a generalization of our previous work, we investigate the
dynamics of the non-local $F(R)$ gravity after casting it into local form. The
non-singular bouncing behavior and quintom model of dark energy are achieved
without involving negative kinetic energy fields. Two cosmological tests are
performe... | [
{
"created": "Mon, 17 Oct 2011 13:55:47 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Farajollahi",
"H.",
""
],
[
"Tayebi",
"F.",
""
],
[
"Milani",
"F.",
""
],
[
"Enayati",
"M.",
""
]
] | In this article in a generalization of our previous work, we investigate the dynamics of the non-local $F(R)$ gravity after casting it into local form. The non-singular bouncing behavior and quintom model of dark energy are achieved without involving negative kinetic energy fields. Two cosmological tests are performed ... |
2207.10459 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Noncommutative geometry and MOND | 5 pages, no figures | Journal of High Energy Physics, Gravitation and Cosmology, vol. 8,
pp. 642-646, 2022 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modified Newtonian dynamics (MOND) is a hypothesized modification of Newton's
law of universal gravitation to account for the flat rotation curves in the
outer regions of galaxies, thereby eliminating the need for dark matter.
Although a highly successful model, it is not a self-contained physical theory
since it is ... | [
{
"created": "Thu, 21 Jul 2022 12:56:34 GMT",
"version": "v1"
},
{
"created": "Sun, 26 May 2024 18:22:53 GMT",
"version": "v2"
}
] | 2024-05-28 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | Modified Newtonian dynamics (MOND) is a hypothesized modification of Newton's law of universal gravitation to account for the flat rotation curves in the outer regions of galaxies, thereby eliminating the need for dark matter. Although a highly successful model, it is not a self-contained physical theory since it is ba... |
2005.01837 | Ra\'ul Carballo-Rubio | Anna Zulianello, Ra\'ul Carballo-Rubio, Stefano Liberati and Stefano
Ansoldi | Electromagnetic tests of horizonless rotating black hole mimickers | V2: 25 pages, 14 figures, 8 tables. Additional discussions included
following suggestions by referees, no physics changes. This version accepted
for publication. V1: 23 pages, 13 figures, 8 tables | Phys. Rev. D 103, 064071 (2021) | 10.1103/PhysRevD.103.064071 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interest in the implications that astrophysical observations have for the
understanding of the structure of black holes has grown since the first
detection of gravitational waves. Many arguments that are put forward in order
to constraint alternative black hole models rely on substantial assumptions
such as perfe... | [
{
"created": "Mon, 4 May 2020 20:43:36 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 2021 15:51:36 GMT",
"version": "v2"
}
] | 2021-03-31 | [
[
"Zulianello",
"Anna",
""
],
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Ansoldi",
"Stefano",
""
]
] | The interest in the implications that astrophysical observations have for the understanding of the structure of black holes has grown since the first detection of gravitational waves. Many arguments that are put forward in order to constraint alternative black hole models rely on substantial assumptions such as perfect... |
gr-qc/9802014 | Roy Maartens | Roy Maartens, William Lesame and George Ellis | Newtonian-like and anti-Newtonian universes | 16 pages Latex (IOP style); to appear Class. Quantum Grav | Class.Quant.Grav. 15 (1998) 1005-1017 | 10.1088/0264-9381/15/4/021 | null | gr-qc | null | In an irrotational dust universe, the locally free gravitational field is
covariantly described by the gravito-electric and gravito-magnetic tensors
$E_{ab}$ and $H_{ab}$. In Newtonian theory, $H_{ab}=0$ and $E_{ab}$ is the
tidal tensor. Newtonian-like dust universes in general relativity (i.e. with
$H_{ab}=0$, often... | [
{
"created": "Fri, 6 Feb 1998 10:37:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Maartens",
"Roy",
""
],
[
"Lesame",
"William",
""
],
[
"Ellis",
"George",
""
]
] | In an irrotational dust universe, the locally free gravitational field is covariantly described by the gravito-electric and gravito-magnetic tensors $E_{ab}$ and $H_{ab}$. In Newtonian theory, $H_{ab}=0$ and $E_{ab}$ is the tidal tensor. Newtonian-like dust universes in general relativity (i.e. with $H_{ab}=0$, often c... |
1410.4555 | Pedro Pina Avelino | P. P. Avelino | Vacuum energy sequestering and cosmic dynamics | 6 pages, 6 figures | Phys.Rev.D 90:103523,2014 | 10.1103/PhysRevD.90.103523 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explicitly compute the dynamics of closed homogeneous and isotropic
universes permeated by a single perfect fluid with a constant equation of state
parameter $w$ in the context of a recent reformulation of general relativity,
proposed in [1], which prevents the vacuum energy from acting as a
gravitational source. ... | [
{
"created": "Thu, 16 Oct 2014 19:28:37 GMT",
"version": "v1"
}
] | 2015-05-06 | [
[
"Avelino",
"P. P.",
""
]
] | We explicitly compute the dynamics of closed homogeneous and isotropic universes permeated by a single perfect fluid with a constant equation of state parameter $w$ in the context of a recent reformulation of general relativity, proposed in [1], which prevents the vacuum energy from acting as a gravitational source. Th... |
2307.11665 | Enrico Cannizzaro | Enrico Cannizzaro, Gabriele Franciolini and Paolo Pani | Novel tests of gravity using nano-Hertz stochastic gravitational-wave
background signals | 7 pages, 4 figures. Matches the published version | null | null | null | gr-qc astro-ph.CO astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravity theories that modify General Relativity in the slow-motion regime can
introduce nonperturbative corrections to the stochastic gravitational-wave
background~(SGWB) from supermassive black-hole binaries in the nano-Hertz band,
while remaining perturbative in the highly-relativistic regime and satisfying
current... | [
{
"created": "Fri, 21 Jul 2023 16:07:51 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2024 14:41:44 GMT",
"version": "v2"
}
] | 2024-05-08 | [
[
"Cannizzaro",
"Enrico",
""
],
[
"Franciolini",
"Gabriele",
""
],
[
"Pani",
"Paolo",
""
]
] | Gravity theories that modify General Relativity in the slow-motion regime can introduce nonperturbative corrections to the stochastic gravitational-wave background~(SGWB) from supermassive black-hole binaries in the nano-Hertz band, while remaining perturbative in the highly-relativistic regime and satisfying current p... |
2001.03773 | Leonid Perlov | Leonid Perlov | Hamiltonian and Diffeomorphism Constraints Generalized for Timelike and
Spacelike 3+1 Foliation | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The form of Hamiltonian and Diffeomorphism constraints in
Sen-Ashtekar-Barbero-Immirzi variables is well known for the spacelike 3+1 ADM
foliation. It is also known that Sen-Ashtekar-Barbero-Immirzi connection can be
introduced only in 3 dimensional space and does not work for $D > 3$. The
reason it works in $D = 3$ ... | [
{
"created": "Sat, 11 Jan 2020 16:51:46 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2020 15:05:49 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Apr 2020 19:40:32 GMT",
"version": "v3"
},
{
"created": "Fri, 8 May 2020 14:38:22 GMT",
"version": "v4"
},
{
"crea... | 2021-04-28 | [
[
"Perlov",
"Leonid",
""
]
] | The form of Hamiltonian and Diffeomorphism constraints in Sen-Ashtekar-Barbero-Immirzi variables is well known for the spacelike 3+1 ADM foliation. It is also known that Sen-Ashtekar-Barbero-Immirzi connection can be introduced only in 3 dimensional space and does not work for $D > 3$. The reason it works in $D = 3$ is... |
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