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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1612.08579 | L. Sriramkumar | L. Sriramkumar | What do detectors detect? | 27 pages, 2 figures, contribution to Prof. T. Padmanabhan's sixtieth
birthday volume | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By a detector, one has in mind a point particle with internal energy levels,
which when set in motion on a generic trajectory can get excited due to its
interaction with a quantum field. Detectors have often been considered as a
helpful tool to understand the concept of a particle in a curved spacetime.
Specifically,... | [
{
"created": "Tue, 27 Dec 2016 11:29:14 GMT",
"version": "v1"
}
] | 2016-12-28 | [
[
"Sriramkumar",
"L.",
""
]
] | By a detector, one has in mind a point particle with internal energy levels, which when set in motion on a generic trajectory can get excited due to its interaction with a quantum field. Detectors have often been considered as a helpful tool to understand the concept of a particle in a curved spacetime. Specifically, t... |
1611.09640 | Bogeun Gwak | Bogeun Gwak | Cosmic Censorship Conjecture in Kerr-Sen Black Hole | 13 pages, published version in PRD | Phys. Rev. D 95, 124050 (2017) | 10.1103/PhysRevD.95.124050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The validity of the cosmic censorship conjecture for the Kerr-Sen black hole,
which is a solution to the low-energy effective field theory for
four-dimensional heterotic string theory, is investigated using charged
particle absorption. When the black hole absorbs the particle, the charge on it
changes owing to the co... | [
{
"created": "Tue, 29 Nov 2016 14:14:36 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 2017 13:53:44 GMT",
"version": "v2"
}
] | 2017-07-03 | [
[
"Gwak",
"Bogeun",
""
]
] | The validity of the cosmic censorship conjecture for the Kerr-Sen black hole, which is a solution to the low-energy effective field theory for four-dimensional heterotic string theory, is investigated using charged particle absorption. When the black hole absorbs the particle, the charge on it changes owing to the cons... |
2106.14220 | Rajesh Kumar | Grishma Verma, Rajesh Kumar, Keshav Ram Mishra | Singularity formation in radiating star with dark energy background | Last section concluded as- From above table-1 we see that due to the
presence of $p_{DE}$, the loss of luminosity increases the when $\rho_0 >
\frac{3R_0^2}{kr_{\sum}^2}$ and it slow down for $\rho_0 <
\frac{3R_0^2}{kr_{\sum}^2}$. Thus for different value of $\epsilon^{'}$,
$p_{DE}$ plays the important role in ... | null | null | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | In this paper, we considered the gravitational collapse of a symmetric
radiating star consisting of perfect fluid (baryonic) in the background of dark
energy (DE) with general equation of state. The effect of DE on the singularity
formation has been discussed first separately (only DE present) and then
combination of... | [
{
"created": "Sun, 27 Jun 2021 12:34:04 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Nov 2021 14:25:15 GMT",
"version": "v2"
}
] | 2021-11-17 | [
[
"Verma",
"Grishma",
""
],
[
"Kumar",
"Rajesh",
""
],
[
"Mishra",
"Keshav Ram",
""
]
] | In this paper, we considered the gravitational collapse of a symmetric radiating star consisting of perfect fluid (baryonic) in the background of dark energy (DE) with general equation of state. The effect of DE on the singularity formation has been discussed first separately (only DE present) and then combination of b... |
gr-qc/0405095 | Georgios Kraniotis | G.V. Kraniotis | Precise relativistic orbits in Kerr and Kerr-(anti) de Sitter spacetimes | 37 pages,LaTeX, Published in Classical and Quantum Gravity 21 (2004)
4743-4769 | Class. Quantum Grav. 21 (2004) 4743-4769 | 10.1088/0264-9381/21/19/016 | MPP-2004-56 | gr-qc astro-ph | null | The timelike geodesic equations resulting from the Kerr gravitational metric
element are derived and solved exactly including the contribution from the
cosmological constant. The geodesic equations are derived, by solving the
Hamilton-Jacobi partial differential equation by separation of variables. The
solutions can ... | [
{
"created": "Tue, 18 May 2004 14:04:54 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2004 12:56:31 GMT",
"version": "v2"
},
{
"created": "Wed, 26 May 2004 11:17:28 GMT",
"version": "v3"
},
{
"created": "Sun, 11 Jul 2004 14:44:32 GMT",
"version": "v4"
},
{
"c... | 2009-11-10 | [
[
"Kraniotis",
"G. V.",
""
]
] | The timelike geodesic equations resulting from the Kerr gravitational metric element are derived and solved exactly including the contribution from the cosmological constant. The geodesic equations are derived, by solving the Hamilton-Jacobi partial differential equation by separation of variables. The solutions can be... |
gr-qc/0603067 | John Hartnett | John G. Hartnett, Michael E. Tobar | Properties of gravitational waves in Cosmological General Relativity | 10 pages, 1 figure, accepted for publication in IJTP, corrected typos | Int.J.Theor.Phys.45:2181-2190,2006 | 10.1063/1.2736982 | null | gr-qc astro-ph | null | The 5D Cosmological General Relativity theory developed by Carmeli reproduces
all of the results that have been successfully tested for Einstein's 4D theory.
However the Carmeli theory because of its fifth dimension, the velocity of the
expanding universe, predicts something different for the propagation of gravity
w... | [
{
"created": "Thu, 16 Mar 2006 09:44:19 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2006 06:34:51 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Hartnett",
"John G.",
""
],
[
"Tobar",
"Michael E.",
""
]
] | The 5D Cosmological General Relativity theory developed by Carmeli reproduces all of the results that have been successfully tested for Einstein's 4D theory. However the Carmeli theory because of its fifth dimension, the velocity of the expanding universe, predicts something different for the propagation of gravity wav... |
gr-qc/0702126 | Matthew D. Duez | Matthew D. Duez, Lawrence E. Kidder, Saul A. Teukolsky | Evolving relativistic fluid spacetimes using pseudospectral methods and
finite differencing | To appear in the Proceedings of the Eleventh Marcel Grossmann Meeting | null | 10.1142/9789812834300_0197 | null | gr-qc | null | We present a new code for solving the coupled Einstein-hydrodynamics
equations to evolve relativistic, self-gravitating fluids. The Einstein field
equations are solved on one grid using pseudospectral methods, while the fluids
are evolved on another grid by finite differencing. We discuss implementation
details, such... | [
{
"created": "Sun, 25 Feb 2007 20:49:46 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Duez",
"Matthew D.",
""
],
[
"Kidder",
"Lawrence E.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | We present a new code for solving the coupled Einstein-hydrodynamics equations to evolve relativistic, self-gravitating fluids. The Einstein field equations are solved on one grid using pseudospectral methods, while the fluids are evolved on another grid by finite differencing. We discuss implementation details, such a... |
2107.07258 | Sayak Datta | Sayak Datta | Probing horizon scale quantum effects with Love | null | null | 10.1088/1361-6382/ac9ae4 | LIGO-P210025 | gr-qc astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Future gravitational wave detectors have been projected to be able to probe
the nature of compact objects in great detail. In this work, we study the
potential observability of the small length scale physics near black hole
horizon with the tidal deformability of the compact objects in an inspiraling
binary. We find ... | [
{
"created": "Thu, 15 Jul 2021 11:29:01 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2022 10:20:54 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Feb 2023 10:52:01 GMT",
"version": "v3"
}
] | 2023-02-16 | [
[
"Datta",
"Sayak",
""
]
] | Future gravitational wave detectors have been projected to be able to probe the nature of compact objects in great detail. In this work, we study the potential observability of the small length scale physics near black hole horizon with the tidal deformability of the compact objects in an inspiraling binary. We find th... |
0705.1060 | Teresa Hui-Ching Lu | Teresa Hui-Ching Lu and Charles Hellaby | Obtaining the spacetime metric from cosmological observations | 26 pages, 10 figures. Minor changes to match the published version | Class.Quant.Grav.24:4107-4132,2007 | 10.1088/0264-9381/24/16/008 | null | gr-qc astro-ph | null | Recent galaxy redshift surveys have brought in a large amount of accurate
cosmological data out to redshift 0.3, and future surveys are expected to
achieve a high degree of completeness out to a redshift exceeding 1.
Consequently, a numerical programme for determining the metric of the universe
from observational dat... | [
{
"created": "Tue, 8 May 2007 10:26:12 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Aug 2007 16:27:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lu",
"Teresa Hui-Ching",
""
],
[
"Hellaby",
"Charles",
""
]
] | Recent galaxy redshift surveys have brought in a large amount of accurate cosmological data out to redshift 0.3, and future surveys are expected to achieve a high degree of completeness out to a redshift exceeding 1. Consequently, a numerical programme for determining the metric of the universe from observational data ... |
gr-qc/0002028 | Mario La Camera | A. G. Agnese and M. La Camera | On 4-dimensional cosmological models locally embedded in a 5-dimensional
Ricci-flat space | 7 pages, Latex2e | Nuovo Cim. B115 (2000) 119-122 | null | null | gr-qc | null | We employ a theorem due to Campbell to build some simple 4-dimensional
cosmological models which originate from solutions describing waves propagating
along the extra-dimension of a 5-dimensional Ricci-flat space. The dimensional
reduction is performed in the Jordan frame according to the induced-matter
theory of Wes... | [
{
"created": "Mon, 7 Feb 2000 11:19:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Agnese",
"A. G.",
""
],
[
"La Camera",
"M.",
""
]
] | We employ a theorem due to Campbell to build some simple 4-dimensional cosmological models which originate from solutions describing waves propagating along the extra-dimension of a 5-dimensional Ricci-flat space. The dimensional reduction is performed in the Jordan frame according to the induced-matter theory of Wesso... |
2205.08259 | Jianda Wu | Yunjing Gao, Jiahao Yang, Zhenyu Zhu, Yosuke Mizuno, and Jianda Wu | A Proposal for Detecting Superfluidity in Neutron Stars | 5 pages, 5 figures | null | null | null | gr-qc astro-ph.HE cond-mat.supr-con | http://creativecommons.org/licenses/by/4.0/ | Based on the GW dispersion relation raised in [1], we investigate the
possible reflection of gravitational wave (GW) by superfluidity (SF) in the
neutron star, provided its high density and dissipationless properties.
Following this scenario, an experimental proposal is raised to probe the
expected SF in neutron star... | [
{
"created": "Tue, 17 May 2022 11:59:50 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2022 05:14:43 GMT",
"version": "v2"
}
] | 2022-10-20 | [
[
"Gao",
"Yunjing",
""
],
[
"Yang",
"Jiahao",
""
],
[
"Zhu",
"Zhenyu",
""
],
[
"Mizuno",
"Yosuke",
""
],
[
"Wu",
"Jianda",
""
]
] | Based on the GW dispersion relation raised in [1], we investigate the possible reflection of gravitational wave (GW) by superfluidity (SF) in the neutron star, provided its high density and dissipationless properties. Following this scenario, an experimental proposal is raised to probe the expected SF in neutron star b... |
1905.04355 | Ben Kain | Ben Kain | Type II critical behavior of gravitating magnetic monopoles | 10 pages, 8 figures | Phys. Rev. D 99, 104017 (2019) | 10.1103/PhysRevD.99.104017 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I study type II critical collapse in the spherically symmetric gravitating
magnetic monopole system. This is an Einstein-Yang-Mills-Higgs system with two
matter fields: a field parametrizing the scalar field gauged under SU(2) and a
field parametrizing the gauge field. This system offers interesting differences
compa... | [
{
"created": "Fri, 10 May 2019 19:41:54 GMT",
"version": "v1"
}
] | 2019-05-29 | [
[
"Kain",
"Ben",
""
]
] | I study type II critical collapse in the spherically symmetric gravitating magnetic monopole system. This is an Einstein-Yang-Mills-Higgs system with two matter fields: a field parametrizing the scalar field gauged under SU(2) and a field parametrizing the gauge field. This system offers interesting differences compare... |
gr-qc/0208024 | Chiao | Raymond Y. Chiao | Conceptual tensions between quantum mechanics and general relativity:
Are there experimental consequences, e.g., superconducting transducers
between electromagnetic and gravitational radiation? | 54 pages, 4 figures, Wheeler Symposium/Chapter | null | null | null | gr-qc | null | One of the conceptual tensions between quantum mechanics (QM) and general
relativity (GR) arises from the clash between the spatial nonseparability of
entangled states in QM, and the complete spatial separability of all physical
systems in GR, i.e., between the nonlocality implied by the superposition
principle, and ... | [
{
"created": "Fri, 9 Aug 2002 06:55:58 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Sep 2002 19:57:26 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Sep 2002 19:42:41 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Chiao",
"Raymond Y.",
""
]
] | One of the conceptual tensions between quantum mechanics (QM) and general relativity (GR) arises from the clash between the spatial nonseparability of entangled states in QM, and the complete spatial separability of all physical systems in GR, i.e., between the nonlocality implied by the superposition principle, and th... |
1411.2582 | Behrouz Mirza | Seyed Ali Hosseini Mansoori, Behrouz Mirza, Mohamadreza Fazel | Hessian matrix, specific heats, Nambu brackets, and thermodynamic
geometry | 14 pages, 12 figures | JHEP04(2015)115 | 10.1007/JHEP04(2015)115 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As an extension to our earlier work \cite{Mirza2}, we employ the Nambu
brackets to prove that the divergences of heat capacities correspond to their
counterparts in thermodynamic geometry. We also obtain a simple representation
for the conformal transformations that connect different thermodynamics metrics
to each ot... | [
{
"created": "Sat, 8 Nov 2014 13:29:21 GMT",
"version": "v1"
},
{
"created": "Wed, 6 May 2015 07:10:36 GMT",
"version": "v2"
}
] | 2015-05-07 | [
[
"Mansoori",
"Seyed Ali Hosseini",
""
],
[
"Mirza",
"Behrouz",
""
],
[
"Fazel",
"Mohamadreza",
""
]
] | As an extension to our earlier work \cite{Mirza2}, we employ the Nambu brackets to prove that the divergences of heat capacities correspond to their counterparts in thermodynamic geometry. We also obtain a simple representation for the conformal transformations that connect different thermodynamics metrics to each othe... |
gr-qc/0403003 | Rainer Kuehne | Rainer W. Kuhne | Cartan's Torsion: Necessity and Observational Evidence | 5 pages, latex | Rel.Grav.Cosmol. 1 (2004) 37-42 | null | null | gr-qc | null | This article starts with the mathematical definition, concrete description,
and physical meaning of Cartan's torsion. I proceed with the argumentation that
torsion is required for the description of intrinsic spin. Moreover I argue
that the duality between curvature and torsion is analogous to the duality
between ele... | [
{
"created": "Sat, 28 Feb 2004 11:13:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kuhne",
"Rainer W.",
""
]
] | This article starts with the mathematical definition, concrete description, and physical meaning of Cartan's torsion. I proceed with the argumentation that torsion is required for the description of intrinsic spin. Moreover I argue that the duality between curvature and torsion is analogous to the duality between elect... |
1310.7390 | Katanaev | M. O. Katanaev | Passing the Einstein-Rosen bridge | 6 pages, 2 figures | null | 10.1142/S0217732314500904 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We relax the requirement of geodesic completeness of a space-time. Instead,
we require test particles trajectories to be smooth only in the physical
sector. Test particles trajectories for Einstein--Rosen bridge are proved to be
smooth in the physical sector, and particles can freely penetrate the bridge in
both dire... | [
{
"created": "Mon, 28 Oct 2013 11:52:24 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Katanaev",
"M. O.",
""
]
] | We relax the requirement of geodesic completeness of a space-time. Instead, we require test particles trajectories to be smooth only in the physical sector. Test particles trajectories for Einstein--Rosen bridge are proved to be smooth in the physical sector, and particles can freely penetrate the bridge in both direct... |
gr-qc/9709020 | Dumitru Vulcanov | Ion I. Cotaescu, Dumitru N. Vulcanov (The West University of
Timisoara, Dept. of Theoretical and Comp. Physics, Timisoara, Romania) | Classical Oscilators in General Relativity | Latex, 10 pages | Europhysics Letters, 49:(2) 156-161 JAN, 2000 | 10.1209/epl/i2000-00100-3 | null | gr-qc | null | It is shown that in general relativity some static metrics are able to
simulate oscillatory motions. Their form depends on two arbitrary real
parameters which determine the specific oscillation modes. The conclusion is
that these metrics can be used for new geometric models of closed or even open
bags.
Pacs: 04.02.... | [
{
"created": "Wed, 10 Sep 1997 07:55:15 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Oct 2000 20:17:47 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Cotaescu",
"Ion I.",
"",
"The West University of\n Timisoara, Dept. of Theoretical and Comp. Physics, Timisoara, Romania"
],
[
"Vulcanov",
"Dumitru N.",
"",
"The West University of\n Timisoara, Dept. of Theoretical and Comp. Physics, Timisoara, Romania"
]
] | It is shown that in general relativity some static metrics are able to simulate oscillatory motions. Their form depends on two arbitrary real parameters which determine the specific oscillation modes. The conclusion is that these metrics can be used for new geometric models of closed or even open bags. Pacs: 04.02.-q a... |
2003.13124 | Jakub Mielczarek Ph.D. | Grzegorz Czelusta, Jakub Mielczarek | Quantum simulations of a qubit of space | 17 pages. Matches the version published in PRD | Phys. Rev. D 103, 046001 (2021) | 10.1103/PhysRevD.103.046001 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In loop quantum gravity approach to Planck scale physics, quantum geometry is
represented by superposition of the so-called spin network states. In the
recent literature, a class of spin networks promising from the perspective of
quantum simulations of quantum gravitational systems has been studied. In this
case, the... | [
{
"created": "Sun, 29 Mar 2020 19:53:45 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2021 15:36:13 GMT",
"version": "v2"
}
] | 2021-02-17 | [
[
"Czelusta",
"Grzegorz",
""
],
[
"Mielczarek",
"Jakub",
""
]
] | In loop quantum gravity approach to Planck scale physics, quantum geometry is represented by superposition of the so-called spin network states. In the recent literature, a class of spin networks promising from the perspective of quantum simulations of quantum gravitational systems has been studied. In this case, the s... |
gr-qc/0501075 | Etera R. Livine | Florian Girelli, Etera R. Livine | Reconstructing Quantum Geometry from Quantum Information: Spin Networks
as Harmonic Oscillators | 16 pages, revtex, 3 figures | Class.Quant.Grav. 22 (2005) 3295-3314 | 10.1088/0264-9381/22/16/011 | null | gr-qc hep-th | null | Loop Quantum Gravity defines the quantum states of space geometry as spin
networks and describes their evolution in time. We reformulate spin networks in
terms of harmonic oscillators and show how the holographic degrees of freedom
of the theory are described as matrix models. This allow us to make a link with
non-co... | [
{
"created": "Tue, 25 Jan 2005 16:01:18 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2005 16:47:57 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Girelli",
"Florian",
""
],
[
"Livine",
"Etera R.",
""
]
] | Loop Quantum Gravity defines the quantum states of space geometry as spin networks and describes their evolution in time. We reformulate spin networks in terms of harmonic oscillators and show how the holographic degrees of freedom of the theory are described as matrix models. This allow us to make a link with non-comm... |
gr-qc/0005113 | Warner A. Miller | Adrian P. Gentle, Daniel E. Holz, Arkady Kheyfets, Pablo Laguna,
Warner A. Miller and Deirdre M. Shoemaker | Constant Crunch Coordinates for Black Hole Simulations | 14 pages, 9 figures. Formatted using Revtex4. To appear Phys. Rev. D
2001, Added numerical results, updated references and revised figures | Phys.Rev.D63:064024,2001 | 10.1103/PhysRevD.63.064024 | null | gr-qc | null | We reinvestigate the utility of time-independent constant mean curvature
foliations for the numerical simulation of a single spherically-symmetric black
hole. Each spacelike hypersurface of such a foliation is endowed with the same
constant value of the trace of the extrinsic curvature tensor, $K$. Of the
three famil... | [
{
"created": "Thu, 25 May 2000 03:15:32 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2001 20:17:17 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Gentle",
"Adrian P.",
""
],
[
"Holz",
"Daniel E.",
""
],
[
"Kheyfets",
"Arkady",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Miller",
"Warner A.",
""
],
[
"Shoemaker",
"Deirdre M.",
""
]
] | We reinvestigate the utility of time-independent constant mean curvature foliations for the numerical simulation of a single spherically-symmetric black hole. Each spacelike hypersurface of such a foliation is endowed with the same constant value of the trace of the extrinsic curvature tensor, $K$. Of the three familie... |
1004.4111 | Ahmadjon Abdujabbarov | V.S. Morozova, B.J. Ahmedov, A.A. Abdujabbarov, A.I. Mamadjanov | Plasma Magnetosphere of Rotating Magnetized Neutron Star in the
Braneworld | 18 pages, 4 figures, accepted by Journal Astrophysics and Space
Science. | Astrophys Space Sci (2010) 330: 257-266 | 10.1007/s10509-010-0388-9 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Plasma magnetosphere surrounding rotating magnetized neutron star in the
braneworld has been studied. For the simplicity of calculations
Goldreich-Julian charge density is analyzed for the aligned neutron star with
zero inclination between magnetic field and rotation axis. From the system of
Maxwell equations in spac... | [
{
"created": "Fri, 23 Apr 2010 12:20:32 GMT",
"version": "v1"
}
] | 2011-07-28 | [
[
"Morozova",
"V. S.",
""
],
[
"Ahmedov",
"B. J.",
""
],
[
"Abdujabbarov",
"A. A.",
""
],
[
"Mamadjanov",
"A. I.",
""
]
] | Plasma magnetosphere surrounding rotating magnetized neutron star in the braneworld has been studied. For the simplicity of calculations Goldreich-Julian charge density is analyzed for the aligned neutron star with zero inclination between magnetic field and rotation axis. From the system of Maxwell equations in spacet... |
gr-qc/0304008 | Miguel Gustavo de Campos Batista | M. de Campos | Perturbed Einstein field equations using Maple | 10 pages | null | null | null | gr-qc | null | We obtain the perturbed components of affine connection and Ricci tensor
using algebraic computation. Naturally, the perturbed Einstein field equations
for the vacuum can be written. The method can be used to obtain perturbed
equations of the superior order.
| [
{
"created": "Tue, 1 Apr 2003 23:46:45 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 2003 14:17:15 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"de Campos",
"M.",
""
]
] | We obtain the perturbed components of affine connection and Ricci tensor using algebraic computation. Naturally, the perturbed Einstein field equations for the vacuum can be written. The method can be used to obtain perturbed equations of the superior order. |
0802.4448 | Sandro Costa | Sandro Silva e Costa | Relations between the modified Chaplygin gas and a scalar field | 13 pages, 2 figures | null | null | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work the modified Chaplygin gas is related to a cosmological scalar
field. Analytical results, more general than the solutions previously shown in
the literature, are presented for the case when the curvature is absent, and
one entirely new particular result is shown for a case where there is
curvature. Also,... | [
{
"created": "Fri, 29 Feb 2008 19:00:52 GMT",
"version": "v1"
}
] | 2008-03-03 | [
[
"Costa",
"Sandro Silva e",
""
]
] | In this work the modified Chaplygin gas is related to a cosmological scalar field. Analytical results, more general than the solutions previously shown in the literature, are presented for the case when the curvature is absent, and one entirely new particular result is shown for a case where there is curvature. Also, i... |
gr-qc/0105083 | Dr Henk van Elst | George F R Ellis (University of Cape Town), Henk van Elst (Queen Mary,
London), Roy Maartens (Portsmouth University) | General relativistic analysis of peculiar velocities | 8 pages, LaTeX2e (iopart); minor changes, matches version accepted
for publication by Classical and Quantum Gravity | Class.Quant.Grav. 18 (2001) 5115-5124 | 10.1088/0264-9381/18/23/308 | uct-cosmology-01/05, QMW-AU-2001-005, PU-RCG 01/18 | gr-qc astro-ph | null | We give a careful general relativistic and (1+3)-covariant analysis of
cosmological peculiar velocities induced by matter density perturbations in the
presence of a cosmological constant. In our quasi-Newtonian approach,
constraint equations arise to maintain zero shear of the non-comoving
fundamental worldlines whic... | [
{
"created": "Wed, 23 May 2001 09:02:08 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2001 16:21:56 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Ellis",
"George F R",
"",
"University of Cape Town"
],
[
"van Elst",
"Henk",
"",
"Queen Mary,\n London"
],
[
"Maartens",
"Roy",
"",
"Portsmouth University"
]
] | We give a careful general relativistic and (1+3)-covariant analysis of cosmological peculiar velocities induced by matter density perturbations in the presence of a cosmological constant. In our quasi-Newtonian approach, constraint equations arise to maintain zero shear of the non-comoving fundamental worldlines which ... |
1605.08975 | Saheb Soroushfar | Saheb Soroushfar, Reza Saffari, Saskia Grunau | Geodesic motion in the spacetime of a static charged black hole in
$f(R)$ gravity | This paper has been merged with arXiv:1605.08976, 18 pages, 2 tables
, 8 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we study the geodesic motion of test particles and light
rays in the spacetime of a static charged black hole in $f(R)$ gravity. The
complete set of analytic solutions of the geodesic equations in the spacetime
of this black hole are presented. The geodesic equations are solved in terms of
Weiers... | [
{
"created": "Sun, 29 May 2016 08:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2016 07:48:05 GMT",
"version": "v2"
}
] | 2016-07-21 | [
[
"Soroushfar",
"Saheb",
""
],
[
"Saffari",
"Reza",
""
],
[
"Grunau",
"Saskia",
""
]
] | In the present paper we study the geodesic motion of test particles and light rays in the spacetime of a static charged black hole in $f(R)$ gravity. The complete set of analytic solutions of the geodesic equations in the spacetime of this black hole are presented. The geodesic equations are solved in terms of Weierstr... |
gr-qc/0211081 | Alejandra Melfo | Alejandra Melfo, Nelson Pantoja and Aureliano Skirzewski | Thick domain wall spacetimes with and without reflection symmetry | 8 pages, no figures | Phys.Rev. D67 (2003) 105003 | 10.1103/PhysRevD.67.105003 | null | gr-qc | null | We show that the spacetimes of domain wall solutions to the coupled
Einstein-scalar field equations with a given scalar field potential fall into
two classes, depending on whether or not reflection symmetry on the wall is
imposed. Solutions with reflection symmetry are dynamic, while the asymmetric
ones are static. A... | [
{
"created": "Mon, 25 Nov 2002 13:09:27 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Melfo",
"Alejandra",
""
],
[
"Pantoja",
"Nelson",
""
],
[
"Skirzewski",
"Aureliano",
""
]
] | We show that the spacetimes of domain wall solutions to the coupled Einstein-scalar field equations with a given scalar field potential fall into two classes, depending on whether or not reflection symmetry on the wall is imposed. Solutions with reflection symmetry are dynamic, while the asymmetric ones are static. Asy... |
2111.01441 | Fay\c{c}al Hammad | P. Sadeghi, F. Hammad, A. Landry, T. Martel | Wave packet treatment of neutrino flavor oscillations in various
spacetimes | 31 pages. 1 figure | Gen. Relativ. Gravit. 53, 98 (2021) | 10.1007/s10714-021-02872-6 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of gravity on neutrino flavor oscillations when each mass
eigenstate is described by a wave packet instead of a plane wave. Two different
approaches for implementing the wave packet formalism in the study of neutrino
flavor oscillations in curved spacetime are examined. We work with a general
stat... | [
{
"created": "Tue, 2 Nov 2021 08:56:19 GMT",
"version": "v1"
}
] | 2021-11-03 | [
[
"Sadeghi",
"P.",
""
],
[
"Hammad",
"F.",
""
],
[
"Landry",
"A.",
""
],
[
"Martel",
"T.",
""
]
] | We study the effect of gravity on neutrino flavor oscillations when each mass eigenstate is described by a wave packet instead of a plane wave. Two different approaches for implementing the wave packet formalism in the study of neutrino flavor oscillations in curved spacetime are examined. We work with a general static... |
1109.6317 | Hossein Farajollahi | H. Farajollahi, A. Salehi, A. Shahabi | Observational constraints in scalar tensor theory with tachyonic
potential | 16 pages, 19 figures, Will be published in JCAP | JCAP10(2011)014 | 10.1088/1475-7516/2011/10/014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of the scalar tensor cosmological model in the presence
of tachyon field. In an alternative approach, in two exponential and power law
form of the scalar field functions in the model, field equations are solved by
simultaneously best fitting the model parameters with the most recent
observationa... | [
{
"created": "Wed, 28 Sep 2011 12:12:14 GMT",
"version": "v1"
}
] | 2011-11-22 | [
[
"Farajollahi",
"H.",
""
],
[
"Salehi",
"A.",
""
],
[
"Shahabi",
"A.",
""
]
] | We study the dynamics of the scalar tensor cosmological model in the presence of tachyon field. In an alternative approach, in two exponential and power law form of the scalar field functions in the model, field equations are solved by simultaneously best fitting the model parameters with the most recent observational ... |
1410.2998 | Cesar Merlin | Cesar Merlin and Abhay G. Shah | Self-force from reconstructed metric perturbations: numerical
implementation in Schwarzschild spacetime | Minor corrections | Phys. Rev. D 91, 024005 (2015) | 10.1103/PhysRevD.91.024005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a first numerical implementation of a new scheme by Pound et al.
that enables the calculation of the gravitational self-force in Kerr spacetime
from a reconstructed metric-perturbation in a radiation gauge. The numerical
task of the metric reconstruction essentially reduces to solving the fully
separable T... | [
{
"created": "Sat, 11 Oct 2014 14:09:41 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Aug 2015 12:55:34 GMT",
"version": "v2"
}
] | 2015-08-10 | [
[
"Merlin",
"Cesar",
""
],
[
"Shah",
"Abhay G.",
""
]
] | We present a first numerical implementation of a new scheme by Pound et al. that enables the calculation of the gravitational self-force in Kerr spacetime from a reconstructed metric-perturbation in a radiation gauge. The numerical task of the metric reconstruction essentially reduces to solving the fully separable Teu... |
gr-qc/0701139 | Matthew Benacquista | K.A. Arnaud, G. Auger, S. Babak, J. Baker, M.J. Benacquista, E.
Bloomer, D. Brown, J.B. Camp, J.K. Cannizzo, N. Christensen, J. Clark, N.J.
Cornsih, J. Crowder, C. Cutler, L.S. Finn, H. Halloin, K. Hayama, M. Hendry,
O. Jeannin, A. Krolak, S.L. Larson, I. Mandel, C. Messenger, R. Meyer, S.
Mohanty, R. Nayak, K.... | Report on the first round of the Mock LISA Data Challenges | Proceedings report from GWDAW 11. Added author, added reference,
clarified some text, removed typos. Results unchanged; Removed author, minor
edits, reflects submitted version | Class.Quant.Grav.24:S529-S540,2007 | 10.1088/0264-9381/24/19/S16 | null | gr-qc | null | The Mock LISA Data Challenges (MLDCs) have the dual purpose of fostering the
development of LISA data analysis tools and capabilities, and demonstrating the
technical readiness already achieved by the gravitational-wave community in
distilling a rich science payoff from the LISA data output. The first round of
MLDCs ... | [
{
"created": "Thu, 25 Jan 2007 20:39:59 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2007 22:40:00 GMT",
"version": "v2"
},
{
"created": "Sun, 8 Apr 2007 00:02:16 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Arnaud",
"K. A.",
""
],
[
"Auger",
"G.",
""
],
[
"Babak",
"S.",
""
],
[
"Baker",
"J.",
""
],
[
"Benacquista",
"M. J.",
""
],
[
"Bloomer",
"E.",
""
],
[
"Brown",
"D.",
""
],
[
"Camp",
"J. B.",
... | The Mock LISA Data Challenges (MLDCs) have the dual purpose of fostering the development of LISA data analysis tools and capabilities, and demonstrating the technical readiness already achieved by the gravitational-wave community in distilling a rich science payoff from the LISA data output. The first round of MLDCs ha... |
2304.14160 | Zeyi Tu | Ze-Yi Tu, Tao Zhu, and Anzhong Wang | Periodic orbits and their gravitational wave radiations in a polymer
black hole in loop quantum gravity | 14 pages, 10 figures, 2 tables;v2:version appeared in PRD | Phys Rev D 108 (2023) 2, 024035 | 10.1103/PhysRevD.108.024035 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | This article provides a detailed investigation into the motion of the
surrounding particles around a polymer black hole in loop quantum gravity
(LQG). Using effective potential, the critical bound orbits and innermost
stable circular orbits (ISCO) are analyzed. The study finds that the radii and
angular momentum of t... | [
{
"created": "Thu, 27 Apr 2023 12:59:47 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jul 2023 06:22:10 GMT",
"version": "v2"
}
] | 2024-04-17 | [
[
"Tu",
"Ze-Yi",
""
],
[
"Zhu",
"Tao",
""
],
[
"Wang",
"Anzhong",
""
]
] | This article provides a detailed investigation into the motion of the surrounding particles around a polymer black hole in loop quantum gravity (LQG). Using effective potential, the critical bound orbits and innermost stable circular orbits (ISCO) are analyzed. The study finds that the radii and angular momentum of the... |
2407.21107 | Armin van de Venn | Armin van de Venn, Ujjwal Agarwal, David Vasak | Road to Singularity Theorems with Torsion | 13 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study examines the formulation of a singularity theorem for timelike
curves including torsion, and establishes the foundational framework necessary
for its derivation. We begin by deriving the relative acceleration for an
arbitrary congruence of timelike curves. The resulting ``deviation equation''
offers an alt... | [
{
"created": "Tue, 30 Jul 2024 18:01:03 GMT",
"version": "v1"
}
] | 2024-08-01 | [
[
"van de Venn",
"Armin",
""
],
[
"Agarwal",
"Ujjwal",
""
],
[
"Vasak",
"David",
""
]
] | This study examines the formulation of a singularity theorem for timelike curves including torsion, and establishes the foundational framework necessary for its derivation. We begin by deriving the relative acceleration for an arbitrary congruence of timelike curves. The resulting ``deviation equation'' offers an alter... |
gr-qc/0211035 | Eugen Radu | Eugen Radu (Faculty of Physics, Albert-Ludwigs-University, Freiburg,
Germany) | A note on Schwarzschild black hole thermodynamics in a magnetic universe | 4 pages, LaTeX, to appear in Mod. Phys. Lett. A | Mod.Phys.Lett. A17 (2002) 2277-2282 | 10.1142/S021773230200899X | null | gr-qc | null | We prove that the thermodynamic properties of a Schwarzschild black hole are
unaffected by an external magnetic field passing through it. Apart from the
background substraction prescription, this result is obtained also by using a
counterterm method.
| [
{
"created": "Mon, 11 Nov 2002 11:32:20 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Radu",
"Eugen",
"",
"Faculty of Physics, Albert-Ludwigs-University, Freiburg,\n Germany"
]
] | We prove that the thermodynamic properties of a Schwarzschild black hole are unaffected by an external magnetic field passing through it. Apart from the background substraction prescription, this result is obtained also by using a counterterm method. |
gr-qc/0612111 | Etera R. Livine | Florian Girelli, Etera R. Livine | Some comments on the universal constant in DSR | 12 pages, Proceedings of DICE2006 (Piombino, Italy) | J.Phys.Conf.Ser.67:012030,2007 | 10.1088/1742-6596/67/1/012030 | null | gr-qc | null | Deformed Special Relativity is usually presented as a deformation of Special
Relativity accommodating a new universal constant, the Planck mass, while
respecting the relativity principle. In order to avoid some fundamental
problems (e.g. soccer ball problem), we argue that we should switch point of
view and consider ... | [
{
"created": "Mon, 18 Dec 2006 19:41:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Girelli",
"Florian",
""
],
[
"Livine",
"Etera R.",
""
]
] | Deformed Special Relativity is usually presented as a deformation of Special Relativity accommodating a new universal constant, the Planck mass, while respecting the relativity principle. In order to avoid some fundamental problems (e.g. soccer ball problem), we argue that we should switch point of view and consider in... |
gr-qc/9902033 | Evgeniy V. Mayorov | V. V. Okorokov | On the incompatibility of experiments confirming certain conclusions of
the general relativity | 5 pages, LaTeX, 1 figure, JPEG | null | null | Preprint ITEP 27-98 | gr-qc | null | Qualitativ arguments are presented which show the incompatibility of the
positive results obtaned in experiments on the gravitational redshift of
photones and in experiments investigating the behavior of clocks in the
gravitational field.
| [
{
"created": "Thu, 11 Feb 1999 13:16:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Okorokov",
"V. V.",
""
]
] | Qualitativ arguments are presented which show the incompatibility of the positive results obtaned in experiments on the gravitational redshift of photones and in experiments investigating the behavior of clocks in the gravitational field. |
2112.02623 | Pramit Rej | Piyali Bhar, Pramit Rej, and P. K. Sahoo | Phantom energy supported wormhole model in $f(R,\,T)$ gravity assuming
conformal motion | Accepted in International Journal of Modern Physics D on 23 November
2021; 15 Pages, 8 Figures | International Journal of Modern Physics D, 31(3), 2250016 (2022) | 10.1142/S021827182250016X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we have discussed Morris and Thorne (MT) wormhole solutions
in a modified theory of gravity that admits conformal motion. Here we explore
the wormhole solutions in $f(R,\,T)$ gravity, which is a function of the Ricci
scalar ($R$) and the trace of the stress-energy tensor ($T$). To study wormhole
geom... | [
{
"created": "Sun, 5 Dec 2021 17:01:59 GMT",
"version": "v1"
}
] | 2022-05-04 | [
[
"Bhar",
"Piyali",
""
],
[
"Rej",
"Pramit",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In this article, we have discussed Morris and Thorne (MT) wormhole solutions in a modified theory of gravity that admits conformal motion. Here we explore the wormhole solutions in $f(R,\,T)$ gravity, which is a function of the Ricci scalar ($R$) and the trace of the stress-energy tensor ($T$). To study wormhole geomet... |
1805.09930 | Ana Avilez-Lopez | M. Hernandez, A. Avilez-Lopez, T. Matos | Could primordial galactic Magnetic Fields be generated by Charged
Ultra-Light Boson Dark Matter? | 15 pages, 5 figures. Submitted to JCAP | null | 10.1140/epjc/s10052-019-7349-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the possibility that primordial magnetic fields
observed in galaxies could be produced by a dark matter halo made of charged
ultra-light bosons. In the model, we assume that ultra-light bosons arise as
excitations of a complex scalar field described by the Klein-Gordon equation
with local $U(1)$... | [
{
"created": "Thu, 24 May 2018 22:54:38 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2018 18:05:47 GMT",
"version": "v2"
}
] | 2019-10-23 | [
[
"Hernandez",
"M.",
""
],
[
"Avilez-Lopez",
"A.",
""
],
[
"Matos",
"T.",
""
]
] | In this work we study the possibility that primordial magnetic fields observed in galaxies could be produced by a dark matter halo made of charged ultra-light bosons. In the model, we assume that ultra-light bosons arise as excitations of a complex scalar field described by the Klein-Gordon equation with local $U(1)$ s... |
gr-qc/0701099 | A. Joel Saavedra | Ram\'on Becar, Samuel Lepe and Joel Saavedra | Quasinormal Modes and Stability Criterion of Dilatonic Black Hole in 1+1
and 4+1 Dimensions | sevarl changes, some reference was added, 10 pages, 4 figures | Phys.Rev.D75:084021,2007 | 10.1103/PhysRevD.75.084021 | null | gr-qc | null | We study the stability of black holes that are solutions of the dilaton
gravity derived from string-theoretical models in two and five dimensions
against to scalar field perturbations, using the Quasinormal Modes (QNMs)
approach. In order to find the QNMs corresponding to a black hole geometry, we
consider perturbati... | [
{
"created": "Wed, 17 Jan 2007 16:10:40 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jan 2007 13:10:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Becar",
"Ramón",
""
],
[
"Lepe",
"Samuel",
""
],
[
"Saavedra",
"Joel",
""
]
] | We study the stability of black holes that are solutions of the dilaton gravity derived from string-theoretical models in two and five dimensions against to scalar field perturbations, using the Quasinormal Modes (QNMs) approach. In order to find the QNMs corresponding to a black hole geometry, we consider perturbation... |
gr-qc/0312118 | Sean A. Hayward | Sean A. Hayward | The light cone at infinity | 4 revtex4 pages, 1 eps figure, presented at 6th APCTP International
Conference on Gravitation and Astrophysics, Ewha Womans University | J.Korean Phys.Soc. 45 (2004) S46-S50 | null | null | gr-qc | null | A recent refinement of Penrose's conformal framework for asymptotically flat
space-times is summarized. The key idea concerns advanced and retarded
conformal factors, which allow a rigid description of infinity as a locally
metric light cone. In the new framework, the Bondi-Sachs energy-flux integrals
of ingoing and ... | [
{
"created": "Tue, 30 Dec 2003 08:34:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hayward",
"Sean A.",
""
]
] | A recent refinement of Penrose's conformal framework for asymptotically flat space-times is summarized. The key idea concerns advanced and retarded conformal factors, which allow a rigid description of infinity as a locally metric light cone. In the new framework, the Bondi-Sachs energy-flux integrals of ingoing and ou... |
2402.07538 | Alessandra Silvestri | Gregory Horndeski and Alessandra Silvestri | 50 Years of Horndeski Gravity: Past, Present and Future | Invited essay for International Journal of Theoretical Physics to
celebrate the 50th anniversary of Horndeski Gravity | International Journal of Theoretical Physics, 2024 | 10.1007/s10773-024-05558-2 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | An essay on Horndeski gravity, how it was formulated in the early 1970s and
how it was 're-discovered' and widely adopted by Cosmologists more than thirty
years later.
| [
{
"created": "Mon, 12 Feb 2024 10:06:03 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Horndeski",
"Gregory",
""
],
[
"Silvestri",
"Alessandra",
""
]
] | An essay on Horndeski gravity, how it was formulated in the early 1970s and how it was 're-discovered' and widely adopted by Cosmologists more than thirty years later. |
1202.4025 | David Garfinkle | David Garfinkle | Matters of Gravity, The Newsletter of the Topical Group on Gravitation
of the American Physical Society, Volume 39, Winter 2012 | 16 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | GGR News: News From NSF, by David Garfinkle We hear that..., by David
Garfinkle GGR Program at the APS meeting in Atlanta, GA, by David Garfinkle
Research Briefs: AdS instability, by David Garfinkle
Conference reports: Isenberg Fest, by Robert M. Wald COSMO 11, by Carlos
Martins Astro-GR 6 2011, by Sascha Husa et... | [
{
"created": "Fri, 17 Feb 2012 21:28:24 GMT",
"version": "v1"
}
] | 2012-02-21 | [
[
"Garfinkle",
"David",
""
]
] | GGR News: News From NSF, by David Garfinkle We hear that..., by David Garfinkle GGR Program at the APS meeting in Atlanta, GA, by David Garfinkle Research Briefs: AdS instability, by David Garfinkle Conference reports: Isenberg Fest, by Robert M. Wald COSMO 11, by Carlos Martins Astro-GR 6 2011, by Sascha Husa et al |
1708.08569 | Zhong-Zhi Xianyu | Lisa Randall and Zhong-Zhi Xianyu | Induced Ellipticity for Inspiraling Binary Systems | 37 pages, ApJ final version | Astrophys. J. 853 (2018) 93 | 10.3847/1538-4357/aaa1a2 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although gravitational waves tend to erase eccentricity of an inspiraling
binary system, ellipticity can be generated in the presence of surrounding
matter. We present a semi-analytical method for understanding the eccentricity
distribution of binary black holes in the presence of a supermassive black hole
in a galac... | [
{
"created": "Tue, 29 Aug 2017 01:25:09 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2018 20:46:07 GMT",
"version": "v2"
}
] | 2018-01-31 | [
[
"Randall",
"Lisa",
""
],
[
"Xianyu",
"Zhong-Zhi",
""
]
] | Although gravitational waves tend to erase eccentricity of an inspiraling binary system, ellipticity can be generated in the presence of surrounding matter. We present a semi-analytical method for understanding the eccentricity distribution of binary black holes in the presence of a supermassive black hole in a galacti... |
1709.00068 | Yen Chin Ong | Yen Chin Ong, James M. Nester | Counting Components in the Lagrange Multiplier Formulation of
Teleparallel Theories | 6 pages, version accepted for publication | Eur. Phys. J. C (2018) 78: 568 | 10.1140/epjc/s10052-018-6050-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Lagrange multiplier formulation of teleparallel theories,
including f(T) gravity, in which the connection is not set to zero a priori and
compare it with the pure frame theory. We show explicitly that the two
formulations are equivalent, in the sense that the dynamical equations have the
same conte... | [
{
"created": "Thu, 31 Aug 2017 20:33:03 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jul 2018 16:51:21 GMT",
"version": "v2"
}
] | 2018-07-17 | [
[
"Ong",
"Yen Chin",
""
],
[
"Nester",
"James M.",
""
]
] | We investigate the Lagrange multiplier formulation of teleparallel theories, including f(T) gravity, in which the connection is not set to zero a priori and compare it with the pure frame theory. We show explicitly that the two formulations are equivalent, in the sense that the dynamical equations have the same content... |
gr-qc/9705054 | Takahiro Tanaka | Takahiro Tanaka and Masa-aki Sakagami | Classical Nature of the Inflaton Field with Self-Interaction | 23 pages, submitted to Phys. Rev. D15 | Prog.Theor.Phys. 100 (1998) 547-580 | 10.1143/PTP.100.547 | OU-TAP 50, kucp0107 | gr-qc | null | Taking into account the effect of self-interaction, the dynamics of the
quantum fluctuations of the inflaton field with $\lambda\phi^4$ potential is
studied in detail. We find that the self interaction efficiently drives the
initial pure state into a mixed one, which can be understood as a statistical
ensemble. Furth... | [
{
"created": "Wed, 21 May 1997 11:24:53 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Tanaka",
"Takahiro",
""
],
[
"Sakagami",
"Masa-aki",
""
]
] | Taking into account the effect of self-interaction, the dynamics of the quantum fluctuations of the inflaton field with $\lambda\phi^4$ potential is studied in detail. We find that the self interaction efficiently drives the initial pure state into a mixed one, which can be understood as a statistical ensemble. Further... |
gr-qc/9710090 | Paulo Rodrigues Lima Vargas Moniz | P.V. Moniz (DAMTP, University of Cambridge) | Can we obtain Conserved Currents in Supersymmetric Quantum Cosmology? | 3 pages, LaTeX, requires mprocl.sty available at
http://shemesh.fiz.huji.ac.il/MG8/submission.html, talk given in the Quantum
Cosmology session at the MG8 conference | null | null | null | gr-qc | null | In this paper we report whether conserved currents can be sensibly defined in
supersymmetric minisuperspaces. Our analysis deals with a k=1 FRW model.
Supermatter in the form of scalar supermultiplets is included. We show that
conserved currents cannot be adequately established except for some very simple
scenarios.
| [
{
"created": "Mon, 20 Oct 1997 10:36:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moniz",
"P. V.",
"",
"DAMTP, University of Cambridge"
]
] | In this paper we report whether conserved currents can be sensibly defined in supersymmetric minisuperspaces. Our analysis deals with a k=1 FRW model. Supermatter in the form of scalar supermultiplets is included. We show that conserved currents cannot be adequately established except for some very simple scenarios. |
gr-qc/9710095 | Shao Ming-xue | Yan Luo, Ming-Xue Shao, Zhong-Yuan Zhu(ITP, Academia Sinica, Beijing,
P.R.China) | Diffeomorphism Invariance of Geometric Descriptions of Palatini and
Ashtekar Gravity | Latex, 6 pages | Phys.Lett. B419 (1998) 37-39 | 10.1016/S0370-2693(97)01468-8 | null | gr-qc hep-th | null | In this paper, we explicitly prove the presymplectic forms of the Palatini
and Ashtekar gravity to be zero along gauge orbits of the Lorentz and
diffeomorphism groups, which ensures the diffeomorphism invariance of these
theories.
| [
{
"created": "Tue, 21 Oct 1997 00:55:37 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Luo",
"Yan",
"",
"ITP, Academia Sinica, Beijing,\n P.R.China"
],
[
"Shao",
"Ming-Xue",
"",
"ITP, Academia Sinica, Beijing,\n P.R.China"
],
[
"Zhu",
"Zhong-Yuan",
"",
"ITP, Academia Sinica, Beijing,\n P.R.China"
]
] | In this paper, we explicitly prove the presymplectic forms of the Palatini and Ashtekar gravity to be zero along gauge orbits of the Lorentz and diffeomorphism groups, which ensures the diffeomorphism invariance of these theories. |
1502.00424 | Paul Tod | James Grant and Paul Tod | Valiente Kroon's obstructions to smoothness at infinity | To appear in GRG | null | 10.1007/s10714-015-1861-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conjecture an interpretation in terms of multipole moments of the
obstructions to smoothness at infinity found for time-symmetric,
conformally-flat initial data by Valiente Kroon (Comm. Math. Phys. 244 (2004),
133-156).
| [
{
"created": "Mon, 2 Feb 2015 10:02:50 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Grant",
"James",
""
],
[
"Tod",
"Paul",
""
]
] | We conjecture an interpretation in terms of multipole moments of the obstructions to smoothness at infinity found for time-symmetric, conformally-flat initial data by Valiente Kroon (Comm. Math. Phys. 244 (2004), 133-156). |
2307.10154 | Riccardo Sturani | Josiel Mendon\c{c}a Soares de Souza, Riccardo Sturani | GWDALI: A Fisher-matrix based software for gravitational wave
parameter-estimation beyond Gaussian approximation | 18 pages, 11 figures | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We introduce GWDALI, a new Fisher-matrix, python based software that computes
likelihood gradients to forecast parameter-estimation precision of arbitrary
network of terrestrial gravitational wave detectors observing compact binary
coalescences. The main new feature with respect to analogous software is to
assess par... | [
{
"created": "Wed, 19 Jul 2023 17:31:53 GMT",
"version": "v1"
}
] | 2023-07-20 | [
[
"de Souza",
"Josiel Mendonça Soares",
""
],
[
"Sturani",
"Riccardo",
""
]
] | We introduce GWDALI, a new Fisher-matrix, python based software that computes likelihood gradients to forecast parameter-estimation precision of arbitrary network of terrestrial gravitational wave detectors observing compact binary coalescences. The main new feature with respect to analogous software is to assess param... |
0707.3396 | Nail Khusnutdinov | Nail R. Khusnutdinov and Ilya V. Bakhmatov | Self-force of a point charge in the space-time of a symmetric wormhole | 18 pages, 3 figures Comments: corrected pdf, enlarged paper | Phys.Rev.D76:124015,2007 | 10.1103/PhysRevD.76.124015 | null | gr-qc | null | We consider the self-energy and the self-force for an electrically charged
particle at rest in the wormhole space-time. We develop general approach and
apply it to two specific profiles of the wormhole throat with singular and with
smooth curvature. The self-force for these two profiles is found in manifest
form; it ... | [
{
"created": "Mon, 23 Jul 2007 15:21:56 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2007 07:27:48 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Oct 2007 10:46:55 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Khusnutdinov",
"Nail R.",
""
],
[
"Bakhmatov",
"Ilya V.",
""
]
] | We consider the self-energy and the self-force for an electrically charged particle at rest in the wormhole space-time. We develop general approach and apply it to two specific profiles of the wormhole throat with singular and with smooth curvature. The self-force for these two profiles is found in manifest form; it is... |
1411.3590 | Suzanne Lan\'ery | Suzanne Lan\'ery and Thomas Thiemann | Projective Limits of State Spaces II. Quantum Formalism | 56 pages, 2 figures | J. Geometry Phys., Volume 116, Pages 10-51, June 2017 | 10.1016/j.geomphys.2017.01.011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this series of papers, we investigate the projective framework initiated
by Jerzy Kijowski and Andrzej Oko{\l}\'ow, which describes the states of a
quantum theory as projective families of density matrices. After discussing the
formalism at the classical level in a first paper, the present second paper is
devoted ... | [
{
"created": "Tue, 11 Nov 2014 22:41:09 GMT",
"version": "v1"
}
] | 2017-02-08 | [
[
"Lanéry",
"Suzanne",
""
],
[
"Thiemann",
"Thomas",
""
]
] | In this series of papers, we investigate the projective framework initiated by Jerzy Kijowski and Andrzej Oko{\l}\'ow, which describes the states of a quantum theory as projective families of density matrices. After discussing the formalism at the classical level in a first paper, the present second paper is devoted to... |
1611.00785 | Ian Jubb | Ian Jubb | The Geometry of Small Causal Cones | null | null | 10.1088/1361-6382/aa68b7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a formula for the spacetime volume of a small causal cone. We use
this formula within the context of causal set theory to construct causal set
expressions for certain geometric quantities relating to a spacetime with a
spacelike hypersurface. We also consider a scalar field on the causal set, and
obtain cau... | [
{
"created": "Wed, 2 Nov 2016 20:13:31 GMT",
"version": "v1"
}
] | 2017-04-19 | [
[
"Jubb",
"Ian",
""
]
] | We derive a formula for the spacetime volume of a small causal cone. We use this formula within the context of causal set theory to construct causal set expressions for certain geometric quantities relating to a spacetime with a spacelike hypersurface. We also consider a scalar field on the causal set, and obtain causa... |
1302.1893 | Eric Woolgar | E Woolgar | Scalar-tensor gravitation and the Bakry-Emery-Ricci tensor | null | Class Quantum Gravit 30 (2013) 085007 | 10.1088/0264-9381/30/8/085007 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bakry-Emery generalized Ricci tensor arises in scalar-tensor gravitation
theories in the conformal gauge known as the Jordan frame. Recent results from
the mathematics literature show that standard singularity and splitting
theorems that hold when an energy condition is applied in general relativity
also hold whe... | [
{
"created": "Thu, 7 Feb 2013 22:02:14 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Woolgar",
"E",
""
]
] | The Bakry-Emery generalized Ricci tensor arises in scalar-tensor gravitation theories in the conformal gauge known as the Jordan frame. Recent results from the mathematics literature show that standard singularity and splitting theorems that hold when an energy condition is applied in general relativity also hold when ... |
gr-qc/9506023 | Fintan Ryan | Fintan D. Ryan | Effect of gravitational radiation reaction on circular orbits around a
spinning black hole | 12 pages | Phys.Rev.D52:3159-3162,1995 | 10.1103/PhysRevD.52.R3159 | null | gr-qc | null | The effect of gravitational radiation reaction on circular orbits around a
spinning (Kerr) black hole is computed to leading order in $S$ (the magnitude
of the spin angular momentum of the hole) and in the strength of gravity $M/r$
(where $M$ is the mass of the black hole, $r$ is the orbital radius, and
$G=c=1$). The... | [
{
"created": "Thu, 8 Jun 1995 20:50:03 GMT",
"version": "v1"
}
] | 2010-01-06 | [
[
"Ryan",
"Fintan D.",
""
]
] | The effect of gravitational radiation reaction on circular orbits around a spinning (Kerr) black hole is computed to leading order in $S$ (the magnitude of the spin angular momentum of the hole) and in the strength of gravity $M/r$ (where $M$ is the mass of the black hole, $r$ is the orbital radius, and $G=c=1$). The r... |
1801.00478 | Javad Taghizadeh Firouzjaee | Alireza Allahyari, Javad T. Firouzjaee and Reza Mansouri | Nonlinear phenomena in general relativity | 8 pages, 2 figures | Eur.Phys.J.Plus 133 (2018) no.4, 147 | 10.1140/epjp/i2018-12000-8 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The perturbation theory plays an important role in studying structure
formation in cosmology and post-Newtonian physics, but not all phenomena can be
described by the linear perturbation theory. Thus, It is necessary to study
exact solutions or higher order perturbations. Specifically, we study black
hole (apparent) ... | [
{
"created": "Mon, 1 Jan 2018 17:15:26 GMT",
"version": "v1"
}
] | 2018-07-17 | [
[
"Allahyari",
"Alireza",
""
],
[
"Firouzjaee",
"Javad T.",
""
],
[
"Mansouri",
"Reza",
""
]
] | The perturbation theory plays an important role in studying structure formation in cosmology and post-Newtonian physics, but not all phenomena can be described by the linear perturbation theory. Thus, It is necessary to study exact solutions or higher order perturbations. Specifically, we study black hole (apparent) ho... |
2403.01828 | Jianbo Lu | Jianbo Lu, Mou Xu, Jing Guo, Ruonan Li | Investigating the Physical Properties of Traversable Wormholes in the
Modified $f(R,T)$ Gravity | 17 pages, 8 figures | General Relativity and Gravitation (2024) 56:37 | 10.1007/s10714-024-03223-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper, we analyze some physical properties of static traversable WH
within the framework of $f(R,T)$ modified gravitational theory. Firstly, we
explore the validity of the null, weak, dominant and strong energy conditions
for wormhole matter for the considered $f(R,T)=R+\alpha R^2+\lambda T$ model.
Research sh... | [
{
"created": "Mon, 4 Mar 2024 08:22:45 GMT",
"version": "v1"
}
] | 2024-03-21 | [
[
"Lu",
"Jianbo",
""
],
[
"Xu",
"Mou",
""
],
[
"Guo",
"Jing",
""
],
[
"Li",
"Ruonan",
""
]
] | In the paper, we analyze some physical properties of static traversable WH within the framework of $f(R,T)$ modified gravitational theory. Firstly, we explore the validity of the null, weak, dominant and strong energy conditions for wormhole matter for the considered $f(R,T)=R+\alpha R^2+\lambda T$ model. Research show... |
2405.02470 | Amir M. Abbassi | S. Azar Ag Galeh, A. M. Abbassi, M. H. Abbassi | Spectrum of Primordial Gravitational Waves in Presence of a Cosmic
String | 10 pages, 1 fig | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider an inflating universe with long straight cosmic
string along z-axis. We show that the effect of cosmic string can be taken as a
perturbation on the background of FRW metric. Then by doing cosmological
perturbations on this inflating cosmic string background, we find linearized
Einstein field... | [
{
"created": "Fri, 3 May 2024 20:08:39 GMT",
"version": "v1"
}
] | 2024-05-07 | [
[
"Galeh",
"S. Azar Ag",
""
],
[
"Abbassi",
"A. M.",
""
],
[
"Abbassi",
"M. H.",
""
]
] | In this paper we consider an inflating universe with long straight cosmic string along z-axis. We show that the effect of cosmic string can be taken as a perturbation on the background of FRW metric. Then by doing cosmological perturbations on this inflating cosmic string background, we find linearized Einstein field e... |
2207.06599 | Alejandro Silva | Javier Chagoya, M. Sabido and A. Silva-Garc\'ia | Vector-tensor gravity from a broken gauge symmetry | null | Class. Quantum Grav. 40 095007 (2023) | 10.1088/1361-6382/acc62e | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a Yang-Mills type gauge theory of vector-tensor
gravity, where the tetrad, the spin connection and vector field are identified
with components of the gauge field. This setup leads to a theory that is
contained in Generalized Proca theories. We solve for static and spherically
symmetric space-... | [
{
"created": "Thu, 14 Jul 2022 01:33:22 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Apr 2023 05:39:07 GMT",
"version": "v2"
}
] | 2023-04-21 | [
[
"Chagoya",
"Javier",
""
],
[
"Sabido",
"M.",
""
],
[
"Silva-García",
"A.",
""
]
] | In this paper we present a Yang-Mills type gauge theory of vector-tensor gravity, where the tetrad, the spin connection and vector field are identified with components of the gauge field. This setup leads to a theory that is contained in Generalized Proca theories. We solve for static and spherically symmetric space-ti... |
gr-qc/9910095 | Murat Ozer sci | Murat \"Ozer | Proposed Experiments to Test the Unified Description of Gravitation and
Electromagnetism through a Symmetric Metric | LaTex, 14 pages, 4 figures(now enlarged), a footnote expanded | null | null | null | gr-qc astro-ph hep-ph math-ph math.MP quant-ph | null | If gravitation and electromagnetism are both described in terms of a
symmetric metric tensor, then the deflection of an electron beam by a charged
sphere should be different from its deflection according to the
Reissner-Nordstr\"om solution of General Relativity. If such a unified
description is true, the equivalence... | [
{
"created": "Tue, 26 Oct 1999 13:55:47 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 1999 13:26:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Özer",
"Murat",
""
]
] | If gravitation and electromagnetism are both described in terms of a symmetric metric tensor, then the deflection of an electron beam by a charged sphere should be different from its deflection according to the Reissner-Nordstr\"om solution of General Relativity. If such a unified description is true, the equivalence p... |
1108.4577 | Diana Kaminski | Diana Kaminski | Algebras of Quantum Variables for Loop Quantum Gravity, I. Overview | 45 pages | null | null | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The operator algebraic framework plays an important role in mathematical
physics. Many different operator algebras exist for example for a theory of
quantum mechanics. In Loop Quantum Gravity only two algebras have been
introduced until now. In the project about 'Algebras of Quantum Variables (AQV)
for LQG' the known... | [
{
"created": "Fri, 19 Aug 2011 16:51:52 GMT",
"version": "v1"
}
] | 2011-08-24 | [
[
"Kaminski",
"Diana",
""
]
] | The operator algebraic framework plays an important role in mathematical physics. Many different operator algebras exist for example for a theory of quantum mechanics. In Loop Quantum Gravity only two algebras have been introduced until now. In the project about 'Algebras of Quantum Variables (AQV) for LQG' the known h... |
1807.03968 | Francesco Sorge | Francesco Sorge | Casimir Effect and Free Fall in a Schwarzschild Black Hole | Talk given at the 15th Marcel Grossmann Meeting, 1-7 July 2018, Rome,
Italy. This is a short version of a more exhaustive paper, to be submitted
soon | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar field vacuum energy and particle creation in a 3D Casimir apparatus,
freely falling in the Schwarzschild spacetime, are considered in the reference
frame of a comoving observer. Following Schwinger's proper time approach,
Casimir energy is evaluated from the effective action, resulting in a small
correction to... | [
{
"created": "Wed, 11 Jul 2018 07:08:12 GMT",
"version": "v1"
}
] | 2018-07-12 | [
[
"Sorge",
"Francesco",
""
]
] | Scalar field vacuum energy and particle creation in a 3D Casimir apparatus, freely falling in the Schwarzschild spacetime, are considered in the reference frame of a comoving observer. Following Schwinger's proper time approach, Casimir energy is evaluated from the effective action, resulting in a small correction to t... |
2002.07130 | Alex Pandya | Alex Pandya, Frans Pretorius | The rotating black hole interior: Insights from gravitational collapse
in $AdS_3$ spacetime | 17 pages, 13 figures; updated to match published version (PRD) | Phys. Rev. D 101, 104026 (2020) | 10.1103/PhysRevD.101.104026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results from a numerical study of rotating black hole formation in
3-dimensional asymptotically anti-de Sitter (AdS) spacetime, focusing on the
structure of the black hole interior. While black holes in $AdS_3$ are of
theoretical interest for a wide variety of reasons, we choose to study this
system primar... | [
{
"created": "Mon, 17 Feb 2020 18:46:31 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2020 16:46:19 GMT",
"version": "v2"
}
] | 2020-05-20 | [
[
"Pandya",
"Alex",
""
],
[
"Pretorius",
"Frans",
""
]
] | We present results from a numerical study of rotating black hole formation in 3-dimensional asymptotically anti-de Sitter (AdS) spacetime, focusing on the structure of the black hole interior. While black holes in $AdS_3$ are of theoretical interest for a wide variety of reasons, we choose to study this system primaril... |
gr-qc/0208066 | Eanna E. Flanagan | Eanna E. Flanagan (Cornell) | Quantum inequalities in two dimensional curved spacetimes | revtex 4, 5 pages, no figures, submitted to Phys. Rev. D. Minor
corrections. v4 Correction to Eq. (2.11) | Phys.Rev. D66 (2002) 104007 | 10.1103/PhysRevD.66.104007 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We generalize a result of Vollick constraining the possible behaviors of the
renormalized expected stress-energy tensor of a free massless scalar field in
two dimensional spacetimes that are globally conformal to Minkowski spacetime.
Vollick derived a lower bound for the energy density measured by a static
observer i... | [
{
"created": "Thu, 22 Aug 2002 18:47:10 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Aug 2002 20:39:55 GMT",
"version": "v2"
},
{
"created": "Sat, 26 Oct 2002 16:04:00 GMT",
"version": "v3"
},
{
"created": "Thu, 3 Dec 2020 19:31:49 GMT",
"version": "v4"
}
] | 2020-12-07 | [
[
"Flanagan",
"Eanna E.",
"",
"Cornell"
]
] | We generalize a result of Vollick constraining the possible behaviors of the renormalized expected stress-energy tensor of a free massless scalar field in two dimensional spacetimes that are globally conformal to Minkowski spacetime. Vollick derived a lower bound for the energy density measured by a static observer in ... |
0911.3805 | Sigbjorn Hervik | J.D. Barrow and S. Hervik | Simple Types of Anisotropic Inflation | 8pages, 3 figs v2:refs added, typos fixed | Phys.Rev.D81:023513,2010 | 10.1103/PhysRevD.81.023513 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We display some simple cosmological solutions of gravity theories with
quadratic Ricci curvature terms added to the Einstein-Hilbert lagrangian which
exhibit anisotropic inflation. The Hubble expansion rates are constant and
unequal in three orthogonal directions. We describe the evolution of the
simplest of these ho... | [
{
"created": "Thu, 19 Nov 2009 14:26:26 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jan 2010 10:26:27 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Barrow",
"J. D.",
""
],
[
"Hervik",
"S.",
""
]
] | We display some simple cosmological solutions of gravity theories with quadratic Ricci curvature terms added to the Einstein-Hilbert lagrangian which exhibit anisotropic inflation. The Hubble expansion rates are constant and unequal in three orthogonal directions. We describe the evolution of the simplest of these homo... |
gr-qc/0411055 | John Klauder | John R. Klauder | Attractions of Affine Quantum Gravity | 9 pages, Conference proceedings | null | null | null | gr-qc | null | All attempts to quantize gravity face several difficult problems. Among these
problems are: (i) metric positivity (positivity of the spatial distance between
distinct points), (ii) the presence of anomalies (partial second-class nature
of the quantum constraints), and (iii) perturbative nonrenormalizability (the
need... | [
{
"created": "Wed, 10 Nov 2004 20:26:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Klauder",
"John R.",
""
]
] | All attempts to quantize gravity face several difficult problems. Among these problems are: (i) metric positivity (positivity of the spatial distance between distinct points), (ii) the presence of anomalies (partial second-class nature of the quantum constraints), and (iii) perturbative nonrenormalizability (the need f... |
2403.07972 | Dr. Sudhaker Upadhyay | Behnam Pourhassan, Hoda Farahani, Farideh Kazemian, \.Izzet
Sakall{\i}, Sudhaker Upadhyay and Dharm Veer Singh | Non-perturbative correction on the black hole geometry | 19 pages, 24 captioned figures, published in Physics of the Dark
Universe | Physics of the Dark Universe 44 (2024) 101444 | 10.1016/j.dark.2024.101444 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we use the holographic principle to obtain a modified metric
of black holes that reproduces the exponentially corrected entropy. The
exponential correction of the black hole entropy comes from non-perturbative
corrections. It interprets as a quantum effect which affects black hole
thermodynamics especi... | [
{
"created": "Tue, 12 Mar 2024 17:08:24 GMT",
"version": "v1"
}
] | 2024-03-14 | [
[
"Pourhassan",
"Behnam",
""
],
[
"Farahani",
"Hoda",
""
],
[
"Kazemian",
"Farideh",
""
],
[
"Sakallı",
"İzzet",
""
],
[
"Upadhyay",
"Sudhaker",
""
],
[
"Singh",
"Dharm Veer",
""
]
] | In this paper, we use the holographic principle to obtain a modified metric of black holes that reproduces the exponentially corrected entropy. The exponential correction of the black hole entropy comes from non-perturbative corrections. It interprets as a quantum effect which affects black hole thermodynamics especial... |
gr-qc/0306126 | Masoud Alimohammadi | M. Alimohammadi, B. Vakili | Spin 0 and spin 1/2 particles in a constant scalar-curvature background | LateX, 10 pages | Annals Phys. 310 (2004) 95 | 10.1016/j.aop.2003.08.019 | null | gr-qc hep-th | null | We study the Klein-Gordon and Dirac equations in the presence of a background
metric ds^2 = -dt^2 + dx^2 + e^{-2gx}(dy^2 + dz^2) in a semi-infinite lab
(x>0). This metric has a constant scalar curvature R=6g^2 and is produced by a
perfect fluid with equation of state p=-\rho /3. The eigenfunctions of spin-0
and spin-... | [
{
"created": "Mon, 30 Jun 2003 09:57:27 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Alimohammadi",
"M.",
""
],
[
"Vakili",
"B.",
""
]
] | We study the Klein-Gordon and Dirac equations in the presence of a background metric ds^2 = -dt^2 + dx^2 + e^{-2gx}(dy^2 + dz^2) in a semi-infinite lab (x>0). This metric has a constant scalar curvature R=6g^2 and is produced by a perfect fluid with equation of state p=-\rho /3. The eigenfunctions of spin-0 and spin-1/... |
1611.06255 | Bekir Baytas | Bekir Bayta\c{s} and Martin Bojowald | Minisuperspace models of discrete systems | 28 pages, 5 figures | Phys. Rev. D 95, 086007 (2017) | 10.1103/PhysRevD.95.086007 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A discrete quantum spin system is presented in which several modern methods
of canonical quantum gravity can be tested with promising results. In
particular, features of interacting dynamics are analyzed with an emphasis on
homogeneous configurations and the dynamical building-up and stability of
long-range correlati... | [
{
"created": "Fri, 18 Nov 2016 21:29:41 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2017 18:52:15 GMT",
"version": "v2"
}
] | 2017-04-19 | [
[
"Baytaş",
"Bekir",
""
],
[
"Bojowald",
"Martin",
""
]
] | A discrete quantum spin system is presented in which several modern methods of canonical quantum gravity can be tested with promising results. In particular, features of interacting dynamics are analyzed with an emphasis on homogeneous configurations and the dynamical building-up and stability of long-range correlation... |
1811.01300 | Jorge Ovalle | J Ovalle, A Sotomayor | A simple method to generate exact physically acceptable anisotropic
solutions in general relativity | 11 pages | Eur. Phys. J. Plus (2018) 133: 428 | 10.1140/epjp/i2018-12291-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the gravitational decoupling through the minimal geometric
deformation approach (MGD-decoupling), we show a simple and powerful method to
generate physically acceptable exact analytical solutions for anisotropic
stellar distributions in general relativity. We find that some perfect fluid
configurations could... | [
{
"created": "Sat, 3 Nov 2018 23:49:22 GMT",
"version": "v1"
}
] | 2018-11-06 | [
[
"Ovalle",
"J",
""
],
[
"Sotomayor",
"A",
""
]
] | By using the gravitational decoupling through the minimal geometric deformation approach (MGD-decoupling), we show a simple and powerful method to generate physically acceptable exact analytical solutions for anisotropic stellar distributions in general relativity. We find that some perfect fluid configurations could b... |
1003.2735 | Manuel Tessmer | Manuel Tessmer, Johannes Hartung, Gerhard Schaefer | Motion and gravitational wave forms of eccentric compact binaries with
orbital-angular-momentum-aligned spins under next-to-leading order in
spin-orbit and leading order in spin(1)-spin(2) and spin-squared couplings | 26 pages, 1 figure, published in CQG. Current version: we removed a
remark and clarified the derivation of the orbital element \e_phi | Class. Quantum Grav. 27 165005 (2010) | 10.1088/0264-9381/27/16/165005 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quasi-Keplerian parameterisation for the solutions of second post-Newtonian
(PN) accurate equations of motion for spinning compact binaries is obtained
including leading order spin-spin and next-to-leading order spin-orbit
interactions. Rotational deformation of the compact objects is incorporated.
For arbitrary ma... | [
{
"created": "Sat, 13 Mar 2010 19:54:33 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Aug 2010 10:22:58 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Jun 2013 10:21:11 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Aug 2013 15:33:37 GMT",
"version": "v4"
}
] | 2015-03-13 | [
[
"Tessmer",
"Manuel",
""
],
[
"Hartung",
"Johannes",
""
],
[
"Schaefer",
"Gerhard",
""
]
] | A quasi-Keplerian parameterisation for the solutions of second post-Newtonian (PN) accurate equations of motion for spinning compact binaries is obtained including leading order spin-spin and next-to-leading order spin-orbit interactions. Rotational deformation of the compact objects is incorporated. For arbitrary mass... |
1808.02353 | Khrystyna Gnatenko | Kh. P. Gnatenko, V. M. Tkachuk | Influence of noncommutativity on the motion of Sun-Earth-Moon system and
the weak equivalence principle | accepted for publication in International Journal of Theoretical
Physics | Int. J. Theor. Phys. 57, No. 11, 3359-3368 (2018) | 10.1007/s10773-018-3848-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Features of motion of macroscopic body in gravitational field in a space with
noncommutativity of coordinates and noncommutativity of momenta are considered
in general case when coordinates and momenta of different particles satisfy
noncommutative algebra with different parameters of noncommutativity. Influence
of no... | [
{
"created": "Sun, 29 Jul 2018 09:13:28 GMT",
"version": "v1"
}
] | 2018-10-17 | [
[
"Gnatenko",
"Kh. P.",
""
],
[
"Tkachuk",
"V. M.",
""
]
] | Features of motion of macroscopic body in gravitational field in a space with noncommutativity of coordinates and noncommutativity of momenta are considered in general case when coordinates and momenta of different particles satisfy noncommutative algebra with different parameters of noncommutativity. Influence of nonc... |
1105.1299 | Andrzej Krasi\'nski | Andrzej Krasi\'nski | Repeatable light paths in the shearfree normal cosmological models | 20 pages, no figures. This version matches the text published in PRD
(except for some graphical conveniences that PRD does not accept). The PRD
referee forced some useful information to be deleted to save space. The
earlier version will be easier to use for calculations | Phys.Rev.D84:023510,2011 | 10.1103/PhysRevD.84.023510 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conditions for the existence of repeatable light paths (RLPs) in the
shearfree normal cosmological models are investigated. It is found that in the
conformally nonflat models the only RLPs are radial null geodesics (in the
spherical case) and their analogues in the plane- and hyperbolically symmetric
cases. In the co... | [
{
"created": "Fri, 6 May 2011 15:23:05 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Aug 2011 10:16:29 GMT",
"version": "v2"
}
] | 2011-08-23 | [
[
"Krasiński",
"Andrzej",
""
]
] | Conditions for the existence of repeatable light paths (RLPs) in the shearfree normal cosmological models are investigated. It is found that in the conformally nonflat models the only RLPs are radial null geodesics (in the spherical case) and their analogues in the plane- and hyperbolically symmetric cases. In the conf... |
2307.03520 | Aneta Wojnar | Anna Pacho{\l}, Aneta Wojnar | Constraining Snyder and GUP models with low-mass stars | 11 pages, 2 figures, 1 table, version compatible with Eur.Phys.J.C | Eur. Phys. J. C 83, 1097 (2023) | 10.1140/epjc/s10052-023-12286-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the application of an equation of state that incorporates
corrections derived from the Snyder model (and the Generalized Uncertainty
Principle) to describe the behavior of matter in a low-mass star. Remarkably,
the resulting equations exhibit striking similarities to those arising from
modified Einstei... | [
{
"created": "Fri, 7 Jul 2023 11:15:55 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Nov 2023 10:32:30 GMT",
"version": "v2"
}
] | 2023-12-05 | [
[
"Pachoł",
"Anna",
""
],
[
"Wojnar",
"Aneta",
""
]
] | We investigate the application of an equation of state that incorporates corrections derived from the Snyder model (and the Generalized Uncertainty Principle) to describe the behavior of matter in a low-mass star. Remarkably, the resulting equations exhibit striking similarities to those arising from modified Einstein ... |
gr-qc/9907006 | Eric Poisson | Karl Martel and Eric Poisson | Gravitational waves from eccentric compact binaries: Reduction in
signal-to-noise ratio due to nonoptimal signal processing | 14 pages, 4 figures, ReVTeX; minor changes made after referee's
comments | Phys.Rev. D60 (1999) 124008 | 10.1103/PhysRevD.60.124008 | null | gr-qc | null | Inspiraling compact binaries have been identified as one of the most
promising sources of gravitational waves for interferometric detectors. Most of
these binaries are expected to have circularized by the time their
gravitational waves enter the instrument's frequency band. However, the
possibility that some of the b... | [
{
"created": "Fri, 2 Jul 1999 19:06:12 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 1999 15:11:46 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Martel",
"Karl",
""
],
[
"Poisson",
"Eric",
""
]
] | Inspiraling compact binaries have been identified as one of the most promising sources of gravitational waves for interferometric detectors. Most of these binaries are expected to have circularized by the time their gravitational waves enter the instrument's frequency band. However, the possibility that some of the bin... |
2408.04701 | Daniel Alfredo Caballero | Daniel A. Caballero, Justin L. Ripley and Nicol\'as Yunes | Radial Mode Stability of Two-Fluid Neutron Stars | 29 pages, 1 figure, submitting to Physical Review D | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radial mode stability is a necessary condition for the astrophysical
viability of compact objects. In recent years, astrophysical models with two
fluids have gain popularity, especially in their ability to model dark matter
admixed neutron stars.Just as is the case of single-fluid stars, a stability
criterion based o... | [
{
"created": "Thu, 8 Aug 2024 18:00:09 GMT",
"version": "v1"
}
] | 2024-08-12 | [
[
"Caballero",
"Daniel A.",
""
],
[
"Ripley",
"Justin L.",
""
],
[
"Yunes",
"Nicolás",
""
]
] | Radial mode stability is a necessary condition for the astrophysical viability of compact objects. In recent years, astrophysical models with two fluids have gain popularity, especially in their ability to model dark matter admixed neutron stars.Just as is the case of single-fluid stars, a stability criterion based on ... |
1605.05263 | Alan Cornell | C.-H. Chen, H. T. Cho, A. S. Cornell and G. Harmsen | Spin-3/2 fields in $D$-dimensional Schwarzschild black hole space-times | 32 pages, 3 figures | Phys. Rev. D 94, 044052 (2016) | 10.1103/PhysRevD.94.044052 | WITS-MITP-022 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous works we have studied spin-3/2 fields near 4-dimensional
Schwarzschild black holes. The techniques we developed in that case have now
been extended here to show that it is possible to determine the potential of
spin-3/2 fields near $D$-dimensional black holes by exploiting the radial
symmetry of the syste... | [
{
"created": "Tue, 17 May 2016 17:54:32 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Chen",
"C. -H.",
""
],
[
"Cho",
"H. T.",
""
],
[
"Cornell",
"A. S.",
""
],
[
"Harmsen",
"G.",
""
]
] | In previous works we have studied spin-3/2 fields near 4-dimensional Schwarzschild black holes. The techniques we developed in that case have now been extended here to show that it is possible to determine the potential of spin-3/2 fields near $D$-dimensional black holes by exploiting the radial symmetry of the system.... |
2212.13246 | Charles Wang | Charles H.-T. Wang, Gianluca Gregori, Robert Bingham, Yakubu Adamu,
Bethel N. Eneh, Ma\'e C. Rodriguez, Sarah-Jane Twigg | Observable Unruh Effect and Unmasked Unruh Radiation | 6 pages, 3 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Unruh effect, thereby an ideally accelerated quantum detector is
predicted to absorb thermalized virtual photons and re-emit real photons, is
significantly extended for laboratory accessible configurations. Using modern
influence functional techniques, we obtain explicit expressions describing the
excitation and ... | [
{
"created": "Mon, 26 Dec 2022 18:27:43 GMT",
"version": "v1"
}
] | 2022-12-27 | [
[
"Wang",
"Charles H. -T.",
""
],
[
"Gregori",
"Gianluca",
""
],
[
"Bingham",
"Robert",
""
],
[
"Adamu",
"Yakubu",
""
],
[
"Eneh",
"Bethel N.",
""
],
[
"Rodriguez",
"Maé C.",
""
],
[
"Twigg",
"Sarah-Jane",
""... | The Unruh effect, thereby an ideally accelerated quantum detector is predicted to absorb thermalized virtual photons and re-emit real photons, is significantly extended for laboratory accessible configurations. Using modern influence functional techniques, we obtain explicit expressions describing the excitation and re... |
2108.02472 | Donato Bini | Donato Bini, Andrea Geralico | Frequency domain analysis of the gravitational wave energy loss in
hyperbolic encounters | 23 pages, revtex macros used | null | 10.1103/PhysRevD.104.104019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The energy radiated (without the 1.5PN tail contribution which requires a
different treatment) by a binary system of compact objects moving in a
hyperboliclike orbit is computed in the frequency domain through the second
post-Newtonian level as an expansion in the large-eccentricity parameter up to
next-to-next-to-le... | [
{
"created": "Thu, 5 Aug 2021 09:26:04 GMT",
"version": "v1"
}
] | 2021-11-17 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | The energy radiated (without the 1.5PN tail contribution which requires a different treatment) by a binary system of compact objects moving in a hyperboliclike orbit is computed in the frequency domain through the second post-Newtonian level as an expansion in the large-eccentricity parameter up to next-to-next-to-lead... |
2001.05678 | James Quach Dr | James Q. Quach | Fisher information and the weak equivalence principle of a quantum
particle in a gravitational wave | null | null | 10.1140/epjc/s10052-020-08530-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the weak equivalence principle (WEP) is violated for a quantum
particle in a gravitational wave (GW) background, in the sense that extra mass
information can be extracted in the presence of the GW. We quantify the degree
of violation with the Fisher information of mass. This provides a precise
characteri... | [
{
"created": "Thu, 16 Jan 2020 06:52:21 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2020 00:00:40 GMT",
"version": "v2"
}
] | 2020-10-30 | [
[
"Quach",
"James Q.",
""
]
] | We show that the weak equivalence principle (WEP) is violated for a quantum particle in a gravitational wave (GW) background, in the sense that extra mass information can be extracted in the presence of the GW. We quantify the degree of violation with the Fisher information of mass. This provides a precise characterisa... |
1610.09892 | Aneta Wojnar | Aneta Wojnar | Extended Theories of Gravity in cosmological and astrophysical
applications | PhD Thesis, 145 pages, 22 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main subjects of the PhD dissertation concern cosmological models
considered in Palatini f(R) gravity and scalar-tensor theories. We introduce a
simple generalization of the LCDM model based on Palatini modified gravity with
quadratic Starobinsky term. A matter source is provided by generalized
Chaplygin gas. The... | [
{
"created": "Mon, 31 Oct 2016 12:19:47 GMT",
"version": "v1"
}
] | 2016-11-01 | [
[
"Wojnar",
"Aneta",
""
]
] | The main subjects of the PhD dissertation concern cosmological models considered in Palatini f(R) gravity and scalar-tensor theories. We introduce a simple generalization of the LCDM model based on Palatini modified gravity with quadratic Starobinsky term. A matter source is provided by generalized Chaplygin gas. The s... |
1803.08346 | Lorenzo Resca Dr. | Lorenzo Resca | Space and Space-Time geodesics in Schwarzschild geometry | 14pp | 2018 Eur. J. Phys. 39 035602 | 10.1088/1361-6404/aab12f | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geodesic orbit equations in the Schwarzschild geometry of general relativity
reduce to ordinary conic sections of Newtonian mechanics and gravity for
material particles in the non-relativistic limit. On the contrary, geodesic
orbit equations for a proper spatial submanifold of Schwarzschild metric at any
given coordi... | [
{
"created": "Wed, 21 Mar 2018 11:34:53 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Apr 2018 02:18:10 GMT",
"version": "v2"
}
] | 2018-04-03 | [
[
"Resca",
"Lorenzo",
""
]
] | Geodesic orbit equations in the Schwarzschild geometry of general relativity reduce to ordinary conic sections of Newtonian mechanics and gravity for material particles in the non-relativistic limit. On the contrary, geodesic orbit equations for a proper spatial submanifold of Schwarzschild metric at any given coordina... |
0906.2528 | Sean A. Hayward | Sean A. Hayward | Involute, minimal, outer and increasingly trapped surfaces | 8 pages | Int.J.Mod.Phys.D20:401-411,2011 | 10.1142/S0218271811018718 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Eight different refinements of trapped surfaces are proposed, of three basic
types, each intended as potential stability conditions. Minimal trapped
surfaces are strictly minimal with respect to the dual expansion vector. Outer
trapped surfaces have positivity of a certain curvature, related to surface
gravity. Incre... | [
{
"created": "Sun, 14 Jun 2009 11:30:50 GMT",
"version": "v1"
}
] | 2011-03-28 | [
[
"Hayward",
"Sean A.",
""
]
] | Eight different refinements of trapped surfaces are proposed, of three basic types, each intended as potential stability conditions. Minimal trapped surfaces are strictly minimal with respect to the dual expansion vector. Outer trapped surfaces have positivity of a certain curvature, related to surface gravity. Increas... |
1203.0589 | Mauricio Bellini | Mauricio Bellini (IFIMAR, Mar del Plata University and CONICET) | Gravitational confinement of photons and matter from Induced Matter
theory | Version to be published in "Results in Physics". arXiv admin note:
text overlap with arXiv:0802.0939 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an Extended Scharzschild-Anti de Sitter (ESAdS) metric here introduced,
where the noncompact extra dimension is time-like, we study the gravitational
confinement of matter and photons from a 5D vacuum. The important result here
obtained is that the photon trajectories (in general, massless particles) are
period... | [
{
"created": "Sat, 3 Mar 2012 00:00:39 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2012 23:03:22 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Apr 2012 14:23:51 GMT",
"version": "v3"
}
] | 2012-04-20 | [
[
"Bellini",
"Mauricio",
"",
"IFIMAR, Mar del Plata University and CONICET"
]
] | Using an Extended Scharzschild-Anti de Sitter (ESAdS) metric here introduced, where the noncompact extra dimension is time-like, we study the gravitational confinement of matter and photons from a 5D vacuum. The important result here obtained is that the photon trajectories (in general, massless particles) are periodic... |
1603.07620 | Marek Szydlowski | Zbigniew Haba, Aleksander Stachowski, Marek Szydlowski | Dynamics of the diffusive DM-DE interaction--dynamical system approach | 25 pages, 11 figures; v.2: corrected formulas, concept of early
energy falsified; accepted in JCAP | JCAP 1607, 024 (2016) | 10.1088/1475-7516/2016/07/024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss dynamics of a model of an energy transfer between dark energy (DE)
and dark matter (DM). The energy transfer is determined by a non-conservation
law resulting from a diffusion of dark matter in an environment of dark energy.
The relativistic invariance defines the diffusion in a unique way. The system
can ... | [
{
"created": "Sun, 13 Mar 2016 15:24:05 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jul 2016 09:28:09 GMT",
"version": "v2"
}
] | 2018-05-22 | [
[
"Haba",
"Zbigniew",
""
],
[
"Stachowski",
"Aleksander",
""
],
[
"Szydlowski",
"Marek",
""
]
] | We discuss dynamics of a model of an energy transfer between dark energy (DE) and dark matter (DM). The energy transfer is determined by a non-conservation law resulting from a diffusion of dark matter in an environment of dark energy. The relativistic invariance defines the diffusion in a unique way. The system can co... |
1910.02752 | Frederick Alford | Frederick Alford | The Scattering Map on Oppenheimer--Snyder Spacetime | null | Ann. Henri Poincar\'e (2020) | 10.1007/s00023-020-00905-5 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this paper we analyse the boundedness of solutions $\phi$ of the wave
equation in the Oppenheimer--Snyder model of gravitational collapse in both the
case of a reflective dust cloud and a permeating dust cloud. We then proceed to
define the scattering map on this space-time, and look at the implications of
our bou... | [
{
"created": "Mon, 7 Oct 2019 12:28:09 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2019 17:20:11 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Mar 2020 16:30:13 GMT",
"version": "v3"
}
] | 2020-03-16 | [
[
"Alford",
"Frederick",
""
]
] | In this paper we analyse the boundedness of solutions $\phi$ of the wave equation in the Oppenheimer--Snyder model of gravitational collapse in both the case of a reflective dust cloud and a permeating dust cloud. We then proceed to define the scattering map on this space-time, and look at the implications of our bound... |
1505.00373 | Dibyendu Panigrahi DP | D. Panigrahi and S. Chatterjee | Thermodynamics of the Variable Modified Chaplygin gas | 19 pages, 8 figures | JCAP 1605 (2016) no.05, 052 | 10.1088/1475-7516/2016/05/052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological model with a new variant of Chaplygin gas obeying an equation
of state(EoS), $P = A\rho - \frac{B}{\rho^{\alpha}}$ where $B= B_{0}a^{n}$ is
investigated in the context of its thermodynamical behaviour. Here $B_{0}$ and
$n$ are constants and $a$ is the scale factor. We show that the equation of
state of... | [
{
"created": "Sat, 2 May 2015 21:23:44 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Oct 2015 18:54:25 GMT",
"version": "v2"
},
{
"created": "Sun, 20 Mar 2016 13:57:24 GMT",
"version": "v3"
}
] | 2017-02-07 | [
[
"Panigrahi",
"D.",
""
],
[
"Chatterjee",
"S.",
""
]
] | A cosmological model with a new variant of Chaplygin gas obeying an equation of state(EoS), $P = A\rho - \frac{B}{\rho^{\alpha}}$ where $B= B_{0}a^{n}$ is investigated in the context of its thermodynamical behaviour. Here $B_{0}$ and $n$ are constants and $a$ is the scale factor. We show that the equation of state of t... |
gr-qc/0310071 | Steven G. Harris | Steven G. Harris | Discrete Group Actions on Spacetimes: Causality Conditions and the
Causal Boundary | 32 pages | Class.Quant.Grav. 21 (2004) 1209-1236 | 10.1088/0264-9381/21/4/032 | null | gr-qc | null | Suppose a spacetime $M$ is a quotient of a spacetime $V$ by a discrete group
of isometries. It is shown how causality conditions in the two spacetimes are
related, and how can one learn about the future causal boundary on $M$ by
studying structures in $V$. The relations between the two are particularly
simple (the bo... | [
{
"created": "Tue, 14 Oct 2003 13:32:11 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Harris",
"Steven G.",
""
]
] | Suppose a spacetime $M$ is a quotient of a spacetime $V$ by a discrete group of isometries. It is shown how causality conditions in the two spacetimes are related, and how can one learn about the future causal boundary on $M$ by studying structures in $V$. The relations between the two are particularly simple (the boun... |
2308.15886 | Davide Perrone | Davide Perrone, Thomas Barreira, Alex Kehagias, Antonio Riotto | Non-linear Black Hole Ringdowns: an Analytical Approach | 23 pages, 4 figures, V2, published version | Nucl.Phys.B 999 (2024) 116432 | 10.1016/j.nuclphysb.2023.116432 | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | Due to the nature of gravity, non-linear effects are left imprinted in the
quasi-normal modes generated in the ringdown phase of the merger of two black
holes. We offer an analytical treatment of the quasi-normal modes at
second-order in black hole perturbation theory which takes advantage from the
fact that the non-... | [
{
"created": "Wed, 30 Aug 2023 09:04:09 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2024 09:26:24 GMT",
"version": "v2"
}
] | 2024-04-09 | [
[
"Perrone",
"Davide",
""
],
[
"Barreira",
"Thomas",
""
],
[
"Kehagias",
"Alex",
""
],
[
"Riotto",
"Antonio",
""
]
] | Due to the nature of gravity, non-linear effects are left imprinted in the quasi-normal modes generated in the ringdown phase of the merger of two black holes. We offer an analytical treatment of the quasi-normal modes at second-order in black hole perturbation theory which takes advantage from the fact that the non-li... |
gr-qc/0501087 | S. Mignemi | M. Melis and S. Mignemi | Global properties of dilatonic Gauss-Bonnet black holes | 12 pages, plain TeX; v.2: phase space is described in more detail | Class.Quant.Grav. 22 (2005) 3169-3180 | 10.1088/0264-9381/22/16/003 | null | gr-qc | null | We study the phase space of the spherically symmetric solutions of Einstein
Gauss-Bonnet system nonminimally coupled to a scalar field and show that in
four dimensions the only regular black hole solutions are asymptotically flat
| [
{
"created": "Thu, 27 Jan 2005 17:08:36 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2005 09:09:29 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Melis",
"M.",
""
],
[
"Mignemi",
"S.",
""
]
] | We study the phase space of the spherically symmetric solutions of Einstein Gauss-Bonnet system nonminimally coupled to a scalar field and show that in four dimensions the only regular black hole solutions are asymptotically flat |
1611.07906 | Chul-Moon Yoo | Chul-Moon Yoo, Tomohiro Harada, Hirotada Okawa | 3D Simulation of Spindle Gravitational Collapse of a Collisionless
Particle System | Results are updated and new results on horizon formation are added in
2nd version. 19 pages, 10 figures | null | 10.1088/1361-6382/aa6ad5 | RUP-16-31 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We simulate the spindle gravitational collapse of a collisionless particle
system in a 3D numerical relativity code and compare the qualitative results
with the old work done by Shapiro and Teukolsky(ST). The simulation starts from
the prolate-shaped distribution of particles and a spindle collapse is
observed. The p... | [
{
"created": "Wed, 23 Nov 2016 17:58:16 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Feb 2017 18:13:24 GMT",
"version": "v2"
}
] | 2017-05-03 | [
[
"Yoo",
"Chul-Moon",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Okawa",
"Hirotada",
""
]
] | We simulate the spindle gravitational collapse of a collisionless particle system in a 3D numerical relativity code and compare the qualitative results with the old work done by Shapiro and Teukolsky(ST). The simulation starts from the prolate-shaped distribution of particles and a spindle collapse is observed. The pea... |
1002.1959 | Florian Conrady | Florian Conrady (Perimeter Inst. Theor. Phys.) and Jeff Hnybida
(Perimeter Inst. Theor. Phys. and Waterloo U.) | A spin foam model for general Lorentzian 4-geometries | 27 pages, 1 figure; v4: published version | Class.Quant.Grav.27:185011,2010 | 10.1088/0264-9381/27/18/185011 | PI-QG-173 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive simplicity constraints for the quantization of general Lorentzian
4-geometries. Our method is based on the correspondence between coherent states
and classical bivectors and the minimization of associated uncertainties. For
spacelike geometries, this scheme agrees with the master constraint method of
the mo... | [
{
"created": "Tue, 9 Feb 2010 20:34:18 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 2010 19:21:44 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Feb 2010 20:31:58 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Jan 2011 20:25:49 GMT",
"version": "v4"
}
] | 2011-01-19 | [
[
"Conrady",
"Florian",
"",
"Perimeter Inst. Theor. Phys."
],
[
"Hnybida",
"Jeff",
"",
"Perimeter Inst. Theor. Phys. and Waterloo U."
]
] | We derive simplicity constraints for the quantization of general Lorentzian 4-geometries. Our method is based on the correspondence between coherent states and classical bivectors and the minimization of associated uncertainties. For spacelike geometries, this scheme agrees with the master constraint method of the mode... |
0708.2481 | Carlo Rovelli | Carlo Rovelli | Comment on "Are the spectra of geometrical operators in Loop Quantum
Gravity really discrete?" by B. Dittrich and T. Thiemann | 6 pages, 1 figure | null | null | null | gr-qc | null | I argue that the prediction of physical discreteness at the Planck scale in
loop gravity is a reasonable conclusion that derives from a sensible ensemble
of hypotheses, in spite of some contrary arguments considered in an interesting
recent paper by Dittrich and Thiemann. The counter-example presented by
Dittrich and... | [
{
"created": "Mon, 20 Aug 2007 07:11:45 GMT",
"version": "v1"
}
] | 2007-08-21 | [
[
"Rovelli",
"Carlo",
""
]
] | I argue that the prediction of physical discreteness at the Planck scale in loop gravity is a reasonable conclusion that derives from a sensible ensemble of hypotheses, in spite of some contrary arguments considered in an interesting recent paper by Dittrich and Thiemann. The counter-example presented by Dittrich and T... |
2110.13940 | Sujoy Modak | Juan R. Salazar, Sujoy K. Modak | Quantum field theory in a de Sitter universe transiting to the radiation
stage | 30 pages, 3 figures; This work is dedicated to the fond memory of
Professor Thanu Padmanabhan | JHEP 05 (2022) 048 | 10.1007/JHEP05(2022)048 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study some physical aspects of quantum field theory in a two stage
universe starting from the inflationary de Sitter and transiting into the
radiation dominated stage. We look into the time evolution of the primordial
vacuum states, associated with the (i) comoving and (ii) Bunch-Davies modes. We
show how the powe... | [
{
"created": "Tue, 26 Oct 2021 18:08:02 GMT",
"version": "v1"
}
] | 2024-04-05 | [
[
"Salazar",
"Juan R.",
""
],
[
"Modak",
"Sujoy K.",
""
]
] | We study some physical aspects of quantum field theory in a two stage universe starting from the inflationary de Sitter and transiting into the radiation dominated stage. We look into the time evolution of the primordial vacuum states, associated with the (i) comoving and (ii) Bunch-Davies modes. We show how the power ... |
1705.04461 | Simen Braeck | S. Braeck, {\O}. Gr{\o}n and I. Farup | The Cosmic Causal Mass | 17 pages, 3 figures | Universe, 3, 38 (2017) | 10.3390/universe3020038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to provide a better understanding of rotating universe models, and
in particular the G\"{o}del universe, we discuss the relationship between
cosmic rotation and perfect inertial dragging. In this connection, the concept
of \emph{causal mass} is defined in a cosmological context, and discussed in
relation to ... | [
{
"created": "Fri, 12 May 2017 08:05:35 GMT",
"version": "v1"
}
] | 2017-05-15 | [
[
"Braeck",
"S.",
""
],
[
"Grøn",
"Ø.",
""
],
[
"Farup",
"I.",
""
]
] | In order to provide a better understanding of rotating universe models, and in particular the G\"{o}del universe, we discuss the relationship between cosmic rotation and perfect inertial dragging. In this connection, the concept of \emph{causal mass} is defined in a cosmological context, and discussed in relation to th... |
1905.03731 | David Benisty | David Benisty, Eduardo I. Guendelman, Emmanuel N. Saridakis, Horst
Stoecker, Jurgen Struckmeier, David Vasak | Inflation from fermions with curvature-dependent mass | 6 pages; 2 Fig; Accepted for publishing in Phys.Rev.D | Phys. Rev. D 100, 043523 (2019) | 10.1103/PhysRevD.100.043523 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model of inflation realization driven by fermions with curvature-dependent
mass is studied. Such a term is derived from the Covariant Canonical Gauge
Theory of gravity (CCGG) incorporating Dirac fermions. We obtain an initial de
Sitter phase followed by a successful exit, and moreover, we acquire the
subsequent the... | [
{
"created": "Thu, 9 May 2019 16:17:19 GMT",
"version": "v1"
},
{
"created": "Sun, 12 May 2019 10:11:49 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Aug 2019 07:45:54 GMT",
"version": "v3"
}
] | 2019-08-15 | [
[
"Benisty",
"David",
""
],
[
"Guendelman",
"Eduardo I.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Stoecker",
"Horst",
""
],
[
"Struckmeier",
"Jurgen",
""
],
[
"Vasak",
"David",
""
]
] | A model of inflation realization driven by fermions with curvature-dependent mass is studied. Such a term is derived from the Covariant Canonical Gauge Theory of gravity (CCGG) incorporating Dirac fermions. We obtain an initial de Sitter phase followed by a successful exit, and moreover, we acquire the subsequent therm... |
1211.6347 | Sebastian Fischetti | Sebastian Fischetti, William Kelly, Donald Marolf | Conserved Charges in Asymptotically (Locally) AdS Spacetimes | To appear as Ch 19 of "The Springer Handbook of Spacetime," edited by
A. Ashtekar and V. Petkov. (Springer-Verlag, expected 2013). v2: Amended
references. v3: Corrected assorted minus sign conventions | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review issues related to conservation laws for gravity with a negative
cosmological constant subject to asymptotically (locally) anti-de Sitter
boundary conditions. Beginning with the empty AdS spacetime, we introduce
asymptotically (locally) AdS (AlAdS) boundary conditions, important properties
of the boundary me... | [
{
"created": "Tue, 27 Nov 2012 16:23:03 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jan 2013 22:03:44 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Apr 2014 02:53:58 GMT",
"version": "v3"
}
] | 2014-04-25 | [
[
"Fischetti",
"Sebastian",
""
],
[
"Kelly",
"William",
""
],
[
"Marolf",
"Donald",
""
]
] | We review issues related to conservation laws for gravity with a negative cosmological constant subject to asymptotically (locally) anti-de Sitter boundary conditions. Beginning with the empty AdS spacetime, we introduce asymptotically (locally) AdS (AlAdS) boundary conditions, important properties of the boundary metr... |
2109.11092 | Craig J. Hogan | Craig Hogan and Stephan S. Meyer | Angular correlations of causally-coherent primordial quantum
perturbations | null | null | 10.1088/1361-6382/ac4829 | FERMILAB-PUB-21-458-AE | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the hypothesis that nonlocal, omnidirectional, causally-coherent
quantum entanglement of inflationary horizons may account for some well-known
measured anomalies of Cosmic Microwave Background (CMB) anisotropy on large
angular scales. It is shown that causal coherence can lead to less cosmic
variance in t... | [
{
"created": "Thu, 23 Sep 2021 01:00:41 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Dec 2021 22:30:58 GMT",
"version": "v2"
}
] | 2022-02-16 | [
[
"Hogan",
"Craig",
""
],
[
"Meyer",
"Stephan S.",
""
]
] | We consider the hypothesis that nonlocal, omnidirectional, causally-coherent quantum entanglement of inflationary horizons may account for some well-known measured anomalies of Cosmic Microwave Background (CMB) anisotropy on large angular scales. It is shown that causal coherence can lead to less cosmic variance in the... |
gr-qc/0501037 | Jose Geraldo Pereira | V. C. de Andrade, A. L. Barbosa, J. G. Pereira | Gravitation and Duality Symmetry | 7 pages, no figures. Version 2: minor presentation changes,
references added. Accepted for publication in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D14 (2005) 1635-1648 | 10.1142/S0218271805007218 | null | gr-qc hep-th | null | By generalizing the Hodge dual operator to the case of soldered bundles, and
working in the context of the teleparallel equivalent of general relativity, an
analysis of the duality symmetry in gravitation is performed. Although the
basic conclusion is that, at least in the general case, gravitation is not dual
symmet... | [
{
"created": "Wed, 12 Jan 2005 11:52:15 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2005 20:16:52 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"de Andrade",
"V. C.",
""
],
[
"Barbosa",
"A. L.",
""
],
[
"Pereira",
"J. G.",
""
]
] | By generalizing the Hodge dual operator to the case of soldered bundles, and working in the context of the teleparallel equivalent of general relativity, an analysis of the duality symmetry in gravitation is performed. Although the basic conclusion is that, at least in the general case, gravitation is not dual symmetri... |
1805.06296 | Ali \"Ovg\"un Dr. | Ali \"Ovg\"un | Light deflection by Damour-Solodukhin wormholes and Gauss-Bonnet theorem | 8 pages, two-column. Accepted for publication in Physical Review D | Phys. Rev. D 98, 044033 (2018) | 10.1103/PhysRevD.98.044033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, using the recent method proposed by Ono, Ishihara and Asada
(OIA) who extend the idea of Gibbons and Werner to the stationary and
axisymmetric case, we apply the Gauss-Bonnet theorem to the optical metric of
the non-rotating and rotating Damour-Solodukhin wormholes spacetimes to study
the weak gravitat... | [
{
"created": "Mon, 14 May 2018 19:12:12 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2018 20:58:39 GMT",
"version": "v2"
}
] | 2018-08-23 | [
[
"Övgün",
"Ali",
""
]
] | In this paper, using the recent method proposed by Ono, Ishihara and Asada (OIA) who extend the idea of Gibbons and Werner to the stationary and axisymmetric case, we apply the Gauss-Bonnet theorem to the optical metric of the non-rotating and rotating Damour-Solodukhin wormholes spacetimes to study the weak gravitatio... |
gr-qc/0311020 | Slava G. Turyshev | Slava G. Turyshev, Michael Shao and Kenneth Nordtvedt Jr | The Laser Astrometric Test of Relativity (LATOR) Mission | 32 pages, 7 figures, invited talk presented at 2003 NASA/JPL Workshop
on Fundamental Physics in Space, April 14-16, 2003, Oxnard, CA. Revised and
extended for publication | Class.Quant.Grav. 21 (2004) 2773-2799 | 10.1088/0264-9381/21/12/001 | null | gr-qc astro-ph physics.space-ph | null | This paper discusses new fundamental physics experiment that will test
relativistic gravity at the accuracy better than the effects of the second
order in the gravitational field strength, $\propto G^2$. The Laser Astrometric
Test Of Relativity (LATOR) mission uses laser interferometry between two
micro-spacecraft wh... | [
{
"created": "Fri, 7 Nov 2003 08:15:13 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2004 05:57:48 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Shao",
"Michael",
""
],
[
"Nordtvedt",
"Kenneth",
"Jr"
]
] | This paper discusses new fundamental physics experiment that will test relativistic gravity at the accuracy better than the effects of the second order in the gravitational field strength, $\propto G^2$. The Laser Astrometric Test Of Relativity (LATOR) mission uses laser interferometry between two micro-spacecraft whos... |
gr-qc/9804020 | Yousuke Itoh | Y. Itoh, M. Hotta, T. Futamase and M. Morikawa | Thermal Hair of Quantum Black Hole | LaTeX, 12 pages, 14 postscript figures, submitted to Phys. Rev. D | Phys.Rev.D58:064016,1998 | 10.1103/PhysRevD.58.064016 | TU-543 | gr-qc | null | We investigate the possibility of statistical explanation of the black hole
entropy by counting quasi-bounded modes of thermal fluctuation in two
dimensional black hole spacetime. The black hole concerned is quantum in the
sense that it is in thermal equilibrium with its Hawking radiation. It is shown
that the fluctu... | [
{
"created": "Tue, 7 Apr 1998 05:02:50 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Itoh",
"Y.",
""
],
[
"Hotta",
"M.",
""
],
[
"Futamase",
"T.",
""
],
[
"Morikawa",
"M.",
""
]
] | We investigate the possibility of statistical explanation of the black hole entropy by counting quasi-bounded modes of thermal fluctuation in two dimensional black hole spacetime. The black hole concerned is quantum in the sense that it is in thermal equilibrium with its Hawking radiation. It is shown that the fluctuat... |
1505.04043 | \.Ibrahim Semiz | \.Ibrahim Semiz, A. Kaz{\i}m \c{C}aml{\i}bel | What do the cosmological supernova data really tell us? | 27 regular LaTeX pages, 16 figures, 4 tables | null | 10.1088/1475-7516/2015/12/038 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Not much by themselves, aparently.
We try to reconstruct the scale factor $a(t)$ of the universe from the SNe Ia
data, i.e. the luminosity distance $d_{L}(z)$, using only the cosmological
principle and the assumption that gravitation is governed by a metric theory.
In our hence "model-independent," or "cosmographic... | [
{
"created": "Fri, 15 May 2015 12:04:36 GMT",
"version": "v1"
}
] | 2017-06-19 | [
[
"Semiz",
"İbrahim",
""
],
[
"Çamlıbel",
"A. Kazım",
""
]
] | Not much by themselves, aparently. We try to reconstruct the scale factor $a(t)$ of the universe from the SNe Ia data, i.e. the luminosity distance $d_{L}(z)$, using only the cosmological principle and the assumption that gravitation is governed by a metric theory. In our hence "model-independent," or "cosmographic" st... |
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