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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1001.2230 | Andr\'es Ace\~na | Andr\'es E. Ace\~na | Minimal data at a given point of space for solutions to certain
geometric systems | 26 pages, no figures | null | 10.1088/0264-9381/27/15/155006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a geometrical system of equations for a three dimensional
Riemannian manifold. This system of equations has been constructed as to
include several physically interesting systems of equations, such as the
stationary Einstein vacuum field equations or harmonic maps coupled to gravity
in three dimensions. We... | [
{
"created": "Wed, 13 Jan 2010 16:45:07 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Aceña",
"Andrés E.",
""
]
] | We consider a geometrical system of equations for a three dimensional Riemannian manifold. This system of equations has been constructed as to include several physically interesting systems of equations, such as the stationary Einstein vacuum field equations or harmonic maps coupled to gravity in three dimensions. We g... |
2103.06516 | Tatsuki Washimi Dr. | T. Washimi, T. Yokozawa, M. Nakano, T. Tanaka, K. Kaihotsu, Y. Mori,
T. Narita | Effects of lightning strokes on underground gravitational waves
observatories | null | JINST 16 P07033 (2021) | 10.1088/1748-0221/16/07/P07033 | JGW-P2112426 | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by-nc-sa/4.0/ | For ground-based gravitational wave (GW) detectors, lightning strokes in the
atmosphere are sources of environmental noise. Some GW detectors are built or
planned in underground facilities, and knowledge of how lightning strokes
affect them is of interest. In this paper, the lightning detection system in
KAGRA is int... | [
{
"created": "Thu, 11 Mar 2021 08:03:51 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Mar 2021 00:56:28 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Jun 2021 07:42:30 GMT",
"version": "v3"
}
] | 2021-07-22 | [
[
"Washimi",
"T.",
""
],
[
"Yokozawa",
"T.",
""
],
[
"Nakano",
"M.",
""
],
[
"Tanaka",
"T.",
""
],
[
"Kaihotsu",
"K.",
""
],
[
"Mori",
"Y.",
""
],
[
"Narita",
"T.",
""
]
] | For ground-based gravitational wave (GW) detectors, lightning strokes in the atmosphere are sources of environmental noise. Some GW detectors are built or planned in underground facilities, and knowledge of how lightning strokes affect them is of interest. In this paper, the lightning detection system in KAGRA is intro... |
1911.06520 | Srijita Sinha | Srijita Sinha and Narayan Banerjee | Density perturbation in an interacting holographic dark energy model | 17 pages, 11 figures, minor changes, references added; version
matches the accepted one | Eur. Phys. J. Plus 135, 779 (2020) | 10.1140/epjp/s13360-020-00803-z | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work deals with the evolution of the density contrasts for a
cosmological model where along with the standard cold dark matter (CDM), the
present Universe also contains holographic dark energy (HDE). The
characteristic infra-red (IR) cut-off is taken as the future event horizon. The
HDE is allowed to inte... | [
{
"created": "Fri, 15 Nov 2019 08:52:32 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jan 2020 09:51:51 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Oct 2020 02:35:45 GMT",
"version": "v3"
}
] | 2020-12-07 | [
[
"Sinha",
"Srijita",
""
],
[
"Banerjee",
"Narayan",
""
]
] | The present work deals with the evolution of the density contrasts for a cosmological model where along with the standard cold dark matter (CDM), the present Universe also contains holographic dark energy (HDE). The characteristic infra-red (IR) cut-off is taken as the future event horizon. The HDE is allowed to intera... |
1601.03941 | Massimo Tessarotto | Massimo Tessarotto (Department of Mathematics and Geosciences,
University of Trieste, Italy and Institute of Physics, Faculty of Philosophy
and Science, Silesian University in Opava, Bezru\v{c}ovo n\'am.13, CZ-74601
Opava, Czech Republic) and Claudio Cremaschini (Institute of Physics, Faculty
of Philosophy and ... | Theory of non-local point transformations - Part 2: General form and
Gedanken experiment | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem is posed of further extending the axiomatic construction proposed
in Part 1 for non-local point transformations mapping in each other different
curved space times. The new transformations apply to curved space times when
expressed in arbitrary coordinate systems. It is shown that the solution
permits to a... | [
{
"created": "Wed, 13 Jan 2016 08:07:05 GMT",
"version": "v1"
}
] | 2016-01-18 | [
[
"Tessarotto",
"Massimo",
"",
"Department of Mathematics and Geosciences,\n University of Trieste, Italy and Institute of Physics, Faculty of Philosophy\n and Science, Silesian University in Opava, Bezručovo nám.13, CZ-74601\n Opava, Czech Republic"
],
[
"Cremaschini",
"Claudio",
... | The problem is posed of further extending the axiomatic construction proposed in Part 1 for non-local point transformations mapping in each other different curved space times. The new transformations apply to curved space times when expressed in arbitrary coordinate systems. It is shown that the solution permits to ach... |
1411.0125 | Bushra Majeed | Bushra Majeed, Mubasher Jamil and Azad A. Siddiqui | Holographic Dark Energy with Time Varying n^2 Parameter in Non-Flat
Universe | 8 pages, 2 figures, Published in: International Journal of
Theoretical Physics | Int. J. Theor. Phys. (2015) 54:42-49 | 10.1007/s10773-014-2197-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a holographic dark energy model, with a varying parameter, n,
which evolves slowly with time. We obtain the differential equation describing
evolution of the dark energy density parameter, $\Omega_d$, for the flat and
non-flat FRW universes. The equation of state parameter in this generalized
version of h... | [
{
"created": "Sat, 1 Nov 2014 14:56:50 GMT",
"version": "v1"
}
] | 2015-01-28 | [
[
"Majeed",
"Bushra",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Siddiqui",
"Azad A.",
""
]
] | We consider a holographic dark energy model, with a varying parameter, n, which evolves slowly with time. We obtain the differential equation describing evolution of the dark energy density parameter, $\Omega_d$, for the flat and non-flat FRW universes. The equation of state parameter in this generalized version of hol... |
2404.16093 | Prashant Kocherlakota | Prashant Kocherlakota and Ramesh Narayan | Self-Gravitating Matter in Stationary and Axisymmetric Black Hole
Spacetimes | 25 pages, 9 figures, 2 tables | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | All black holes (BHs) in nature are expected to be described by the Kerr
vacuum solution of general relativity. However, the Kerr solution comes with
several difficulties such as the existence of Cauchy horizons, curvature
singularities, and causality-violating regions. Attempts to resolve some of
these issues includ... | [
{
"created": "Wed, 24 Apr 2024 18:00:01 GMT",
"version": "v1"
}
] | 2024-04-26 | [
[
"Kocherlakota",
"Prashant",
""
],
[
"Narayan",
"Ramesh",
""
]
] | All black holes (BHs) in nature are expected to be described by the Kerr vacuum solution of general relativity. However, the Kerr solution comes with several difficulties such as the existence of Cauchy horizons, curvature singularities, and causality-violating regions. Attempts to resolve some of these issues include ... |
2407.14122 | Gamal G.L. Nashed | Waleed El Hanafy, Mahmoud Hashim, and G.G.L. Nashed | Revisiting Flat Rotation Curves in Chern-Simons Modified Gravity | 13 pages, 2 figures, match the version that will appear in Phys.
Lett. B | null | 10.1016/j.physletb.2024.138882 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We revisit slow rotating black hole (BH) solutions in Chern-Simons modified
gravity (CSMG) by considering perturbative solution about Schwarzschild BH. In
particular, the case when nondynamical CSMG with noncanonical CS scalar is
considered. We provide a new solution different from the previously obtained
one \cite{K... | [
{
"created": "Fri, 19 Jul 2024 08:41:58 GMT",
"version": "v1"
}
] | 2024-07-22 | [
[
"Hanafy",
"Waleed El",
""
],
[
"Hashim",
"Mahmoud",
""
],
[
"Nashed",
"G. G. L.",
""
]
] | We revisit slow rotating black hole (BH) solutions in Chern-Simons modified gravity (CSMG) by considering perturbative solution about Schwarzschild BH. In particular, the case when nondynamical CSMG with noncanonical CS scalar is considered. We provide a new solution different from the previously obtained one \cite{Kon... |
1909.07803 | Subhajit Saha | Subhajit Saha | How to obtain a class of emergent universes with a general form of
dissipation? | 5 pages; Under Review | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have assumed a flat Friedmann-Lemaitr\'e-Robertson-Walker
universe endowed with a general form of dissipation. The source of dissipation
is considered to be a bulk viscous pressure $\Pi$ which leads to an adiabatic
creation of particles induced by the gravitational field. Further, the cosmic
substra... | [
{
"created": "Sun, 15 Sep 2019 10:07:14 GMT",
"version": "v1"
}
] | 2019-09-18 | [
[
"Saha",
"Subhajit",
""
]
] | In this paper, we have assumed a flat Friedmann-Lemaitr\'e-Robertson-Walker universe endowed with a general form of dissipation. The source of dissipation is considered to be a bulk viscous pressure $\Pi$ which leads to an adiabatic creation of particles induced by the gravitational field. Further, the cosmic substratu... |
gr-qc/0702075 | Salvatore Capozziello | S. Capozziello, R. Garattini | The cosmological constant as an eigenvalue of f(R)-gravity Hamiltonian
constraint | 16 pages, to appear in Class. Quant. Grav | Class.Quant.Grav.24:1627-1646,2007 | 10.1088/0264-9381/24/6/016 | null | gr-qc astro-ph hep-th | null | In the framework of ADM formalism, it is possible to find out eigenvalues of
the WDW equation with the meaning of vacuum states, i.e. cosmological
constants, for f(R) theories of gravity, where f(R) is a generic analytic
function of the Ricci curvature scalar R. The explicit calculation is performed
for a Schwarzschi... | [
{
"created": "Wed, 14 Feb 2007 08:43:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Capozziello",
"S.",
""
],
[
"Garattini",
"R.",
""
]
] | In the framework of ADM formalism, it is possible to find out eigenvalues of the WDW equation with the meaning of vacuum states, i.e. cosmological constants, for f(R) theories of gravity, where f(R) is a generic analytic function of the Ricci curvature scalar R. The explicit calculation is performed for a Schwarzschild... |
1702.05246 | Tao Wang | Shao-Jun Wang, Xin-Xuan Guo, Towe Wang | Maximal volume behind horizons without curvature singularity | 11 pages, 4 figures, Sect III improved | Phys. Rev. D 97, 024039 (2018) | 10.1103/PhysRevD.97.024039 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The black hole information paradox is related to the area of event horizon,
and potentially to the volume and singularity behind it. One example is the
complexity/volume duality conjectured by Stanford and Susskind. Accepting the
proposal of Christodoulou and Rovelli, we calculate the maximal volume inside
regular bl... | [
{
"created": "Fri, 17 Feb 2017 07:51:33 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2018 09:52:01 GMT",
"version": "v2"
}
] | 2018-01-31 | [
[
"Wang",
"Shao-Jun",
""
],
[
"Guo",
"Xin-Xuan",
""
],
[
"Wang",
"Towe",
""
]
] | The black hole information paradox is related to the area of event horizon, and potentially to the volume and singularity behind it. One example is the complexity/volume duality conjectured by Stanford and Susskind. Accepting the proposal of Christodoulou and Rovelli, we calculate the maximal volume inside regular blac... |
gr-qc/0002003 | Leonid Ya. Kobelev | L.Ya.Kobelev | Maxwell equation, Shroedinger equation, Dirac equation, Einstein
equation defined on the multifractal sets of the time and the space | RevTeX | null | null | null | gr-qc | null | What forms will have an equations of modern physics if the dimensions of our
time and space are fractional? The generalized equations enumerated by title
are presented by help the generalized fractional derivatives of
Riemann-Liouville.
| [
{
"created": "Tue, 1 Feb 2000 10:23:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kobelev",
"L. Ya.",
""
]
] | What forms will have an equations of modern physics if the dimensions of our time and space are fractional? The generalized equations enumerated by title are presented by help the generalized fractional derivatives of Riemann-Liouville. |
1712.09878 | Kristina Giesel | Kristina Giesel, Adrian Herzog | Gauge invariant canonical cosmological perturbation theory with
geometrical clocks in extended phase space - a review and applications | Added some references, corrected typos | Int. J. Mod. Phys. D 27, 1830005 (2018) | 10.1142/S0218271818300057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theory of cosmological perturbations is a well elaborated field. To deal
with the diffeomorphism invariance of general relativity one generally
introduces combinations of the metric and matter perturbations which are gauge
invariant up to the considered order in the perturbations. For linear
cosmological perturba... | [
{
"created": "Thu, 28 Dec 2017 14:51:27 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Mar 2018 14:19:27 GMT",
"version": "v2"
}
] | 2018-05-31 | [
[
"Giesel",
"Kristina",
""
],
[
"Herzog",
"Adrian",
""
]
] | The theory of cosmological perturbations is a well elaborated field. To deal with the diffeomorphism invariance of general relativity one generally introduces combinations of the metric and matter perturbations which are gauge invariant up to the considered order in the perturbations. For linear cosmological perturbati... |
gr-qc/0006063 | Manfred Requardt | Manfred Requardt | Let's call it Nonlocal Quantum Physics | 47 pages, Latex, no figures | null | null | null | gr-qc hep-th quant-ph | null | In the following we undertake to derive quantum theory as a stochastic
low-energy and coarse-grained theory from a more primordial discrete and
basically geometric theory living on the Planck scale and which (as we argue)
possibly underlies also \tit{string theory}. We isolate the so-called
\tit{ideal elements} which... | [
{
"created": "Mon, 19 Jun 2000 08:56:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Requardt",
"Manfred",
""
]
] | In the following we undertake to derive quantum theory as a stochastic low-energy and coarse-grained theory from a more primordial discrete and basically geometric theory living on the Planck scale and which (as we argue) possibly underlies also \tit{string theory}. We isolate the so-called \tit{ideal elements} which r... |
2402.18237 | Houri Ziaeepour | Houri Ziaeepour | Quantum state of fields in $SU(\infty)$ Quantum Gravity
($SU(\infty)$-QGR) | 18+12 pages, 1 figure. v2: citation extended | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our Universe is ruled by quantum mechanics and should be treated as a quantum
system. {$SU(\infty)$-QGR is a recently proposed quantum model for the
Universe, in which gravity is associated to $SU(\infty)$ symmetry of its
Hilbert space. Clustering/blockization of its infinite dimensional state due to
random quantum f... | [
{
"created": "Wed, 28 Feb 2024 11:06:45 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jul 2024 09:20:29 GMT",
"version": "v2"
}
] | 2024-07-09 | [
[
"Ziaeepour",
"Houri",
""
]
] | Our Universe is ruled by quantum mechanics and should be treated as a quantum system. {$SU(\infty)$-QGR is a recently proposed quantum model for the Universe, in which gravity is associated to $SU(\infty)$ symmetry of its Hilbert space. Clustering/blockization of its infinite dimensional state due to random quantum flu... |
1802.02334 | Tuhina Manna | Tuhina Manna, Farook Rahaman, Sabiruddin Molla, Jhumpa Bhadra and
Hasrat Hussain Shah | Strong Lensing of a Regular Black Hole with an Electrodynamics Source | Accepted in General Relativity and Gravitation | Gen.Rel.Grav. 50 (2018) 5, 54 | 10.1007/s10714-018-2375-3 | GERG-D-18-00048 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have investigated the gravitational lensing phenomenon in
the strong field regime for a regular, charged, static, non-linear black hole
having a electrodynamics source. We have obtained the angle of deflection and
compared it to a Schwarzschild black hole and Reissner Nordstrom black hole
with simil... | [
{
"created": "Wed, 7 Feb 2018 08:01:26 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2018 17:11:36 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Nov 2023 15:29:54 GMT",
"version": "v3"
}
] | 2023-11-09 | [
[
"Manna",
"Tuhina",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Molla",
"Sabiruddin",
""
],
[
"Bhadra",
"Jhumpa",
""
],
[
"Shah",
"Hasrat Hussain",
""
]
] | In this paper we have investigated the gravitational lensing phenomenon in the strong field regime for a regular, charged, static, non-linear black hole having a electrodynamics source. We have obtained the angle of deflection and compared it to a Schwarzschild black hole and Reissner Nordstrom black hole with similar... |
gr-qc/9801077 | Alfio Bonanno | Alfio Bonanno (Istituto di Astronomia, Catania) | The Cauchy Horizon in Higher-derivative Gravity Theories | REVTex, 13 pages, to appear on the proceedings of the workshop on "
The Internal Structure of Black Holes and Spacetime Singularities", held at
Technion -Israel Institute of Technology-, Haifa,Israel,June 29-July 3, 1997 | null | null | Istituto di Astronomia, preprint 2-1998 | gr-qc | null | A class of exact solutions of the field equations with higher derivative
terms is presented when the matter field is a pressureless null fluid plus a
Maxwellian static electric component. It is found that the stable solutions are
black holes in anti de Sitter background. The issue of the stability of the
Cauchy horiz... | [
{
"created": "Thu, 22 Jan 1998 12:35:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bonanno",
"Alfio",
"",
"Istituto di Astronomia, Catania"
]
] | A class of exact solutions of the field equations with higher derivative terms is presented when the matter field is a pressureless null fluid plus a Maxwellian static electric component. It is found that the stable solutions are black holes in anti de Sitter background. The issue of the stability of the Cauchy horizon... |
1801.03426 | Vasilis Oikonomou | V.K. Oikonomou | Exponential Inflation with $F(R)$ Gravity | PRD Accepted | Phys. Rev. D 97, 064001 (2018) | 10.1103/PhysRevD.97.064001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we shall consider an exponential inflationary model in the
context of vacuum $F(R)$ gravity. By using well-known reconstruction
techniques, we shall investigate which $F(R)$ gravity can realize the
exponential inflation scenario at leading order in terms of the scalar
curvature, and we shall calculate t... | [
{
"created": "Wed, 10 Jan 2018 15:46:03 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2018 01:57:25 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this paper we shall consider an exponential inflationary model in the context of vacuum $F(R)$ gravity. By using well-known reconstruction techniques, we shall investigate which $F(R)$ gravity can realize the exponential inflation scenario at leading order in terms of the scalar curvature, and we shall calculate the... |
1411.1943 | Marcello Ortaggio | Marcello Ortaggio, Jiri Podolsky, Martin Zofka | Static and radiating p-form black holes in the higher dimensional
Robinson-Trautman class | 34 pages. v2: improved discussion following eq. (84), references
updated, minor changes to match the published version | JHEP 1502 (2015) 045 | 10.1007/JHEP02(2015)045 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Robinson-Trautman spacetimes in the presence of an aligned p-form
Maxwell field and an arbitrary cosmological constant in n>=4 dimensions. As it
turns out, the character of these exact solutions depends significantly on the
(relative) value of n and p. In odd dimensions the solutions reduce to static
black h... | [
{
"created": "Fri, 7 Nov 2014 15:05:15 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2015 15:20:00 GMT",
"version": "v2"
}
] | 2015-03-03 | [
[
"Ortaggio",
"Marcello",
""
],
[
"Podolsky",
"Jiri",
""
],
[
"Zofka",
"Martin",
""
]
] | We study Robinson-Trautman spacetimes in the presence of an aligned p-form Maxwell field and an arbitrary cosmological constant in n>=4 dimensions. As it turns out, the character of these exact solutions depends significantly on the (relative) value of n and p. In odd dimensions the solutions reduce to static black hol... |
2407.19017 | Arwa Elhashash | Arwa Elhashash, David A. Nichols | Waveform models for the gravitational-wave memory effect: Extreme
mass-ratio limit and final memory offset | 23 pages, 13 figures | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational-wave (GW) memory effect is a strong-field relativistic
phenomenon that is associated with a persistent change in the GW strain after
the passage of a GW. The nonlinear effect arises from interactions of GWs
themselves in the wave zone and is an observable effect connected to the
infrared properties ... | [
{
"created": "Fri, 26 Jul 2024 18:01:06 GMT",
"version": "v1"
}
] | 2024-07-30 | [
[
"Elhashash",
"Arwa",
""
],
[
"Nichols",
"David A.",
""
]
] | The gravitational-wave (GW) memory effect is a strong-field relativistic phenomenon that is associated with a persistent change in the GW strain after the passage of a GW. The nonlinear effect arises from interactions of GWs themselves in the wave zone and is an observable effect connected to the infrared properties of... |
1903.04845 | Mohammad Ali Gorji | Mohammad Ali Gorji, Shinji Mukohyama, Hassan Firouzjahi | Cosmology in Mimetic SU(2) Gauge Theory | 18 pages, 14 figures | JCAP 2019 (2020) no.05, 019 | 10.1088/1475-7516/2019/05/019 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the standard scalar field mimetic cosmology provides a
dark matter-like energy density component. Considering $SU(2)$ gauge symmetry,
we study the gauge field extension of the mimetic scenario in spatially flat
and curved FLRW spacetimes. Because of the mimetic constraint, the standard
Yang-Mill... | [
{
"created": "Tue, 12 Mar 2019 11:18:06 GMT",
"version": "v1"
}
] | 2019-06-03 | [
[
"Gorji",
"Mohammad Ali",
""
],
[
"Mukohyama",
"Shinji",
""
],
[
"Firouzjahi",
"Hassan",
""
]
] | It is well known that the standard scalar field mimetic cosmology provides a dark matter-like energy density component. Considering $SU(2)$ gauge symmetry, we study the gauge field extension of the mimetic scenario in spatially flat and curved FLRW spacetimes. Because of the mimetic constraint, the standard Yang-Mills ... |
gr-qc/0401061 | Muhammad Sharif | M. Sharif | Symmetries of the Energy-Momentum Tensor of Cylindrically Symmetric
Static Spacetimes | 42 pages, no figure, LaTeX, Accepted for publication in J. Math. Phys | J.Math.Phys. 45 (2004) 1532-1560 | 10.1063/1.1668335 | null | gr-qc | null | We investigate matter symmetries of cylindrically symmetric static
spacetimes. These are classified for both cases when the energy-momentum tensor
is non-degenerate and also when it is degenerate. It is found that the
non-degenerate energy-momentum tensor gives either three, four, five, six,
seven or ten independent ... | [
{
"created": "Wed, 14 Jan 2004 12:44:23 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Sharif",
"M.",
""
]
] | We investigate matter symmetries of cylindrically symmetric static spacetimes. These are classified for both cases when the energy-momentum tensor is non-degenerate and also when it is degenerate. It is found that the non-degenerate energy-momentum tensor gives either three, four, five, six, seven or ten independent ma... |
2005.02616 | Konstantin Osetrin | Evgeny Osetrin, Konstantin Osetrin, Altair Filippov, Ilya Kirnos | Wave-like spatially homogeneous models of Stackel spacetimes (3.1) type
in the scalar-tensor theory of gravity | 7 pages | International Journal of Geometric Methods in Modern Physics, 2020 | 10.1142/S0219887820501844 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All classes of spatially homogeneous space-time models in the generalized
scalar-tensor theory of gravity are found that allow the integration of the
equations of motion of test particles and the eikonal equation by the method of
%complete separation of variables by type (3.1). Three classes of exact
solutions are ob... | [
{
"created": "Wed, 6 May 2020 06:54:55 GMT",
"version": "v1"
}
] | 2020-10-06 | [
[
"Osetrin",
"Evgeny",
""
],
[
"Osetrin",
"Konstantin",
""
],
[
"Filippov",
"Altair",
""
],
[
"Kirnos",
"Ilya",
""
]
] | All classes of spatially homogeneous space-time models in the generalized scalar-tensor theory of gravity are found that allow the integration of the equations of motion of test particles and the eikonal equation by the method of %complete separation of variables by type (3.1). Three classes of exact solutions are obta... |
gr-qc/0409090 | Thomas Roman | Thomas A. Roman | Some Thoughts on Energy Conditions and Wormholes | 24 pages; to appear in the Proceedings of the Tenth Marcel Grossmann
Meeting on General Relativity and Gravitation | null | 10.1142/9789812704030_0236 | null | gr-qc hep-th quant-ph | null | This essay reviews some of the recent progress in the area of energy
conditions and wormholes. Most of the discussion centers on the subject of
``quantum inequality'' restrictions on negative energy. These are bounds on the
magnitude and duration of negative energy which put rather severe constraints
on its possible ... | [
{
"created": "Thu, 23 Sep 2004 15:56:37 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Roman",
"Thomas A.",
""
]
] | This essay reviews some of the recent progress in the area of energy conditions and wormholes. Most of the discussion centers on the subject of ``quantum inequality'' restrictions on negative energy. These are bounds on the magnitude and duration of negative energy which put rather severe constraints on its possible ma... |
2405.08857 | Michele Vallisneri | Michele Vallisneri, Marco Crisostomi, Aaron D. Johnson, Patrick M.
Meyers | Rapid parameter estimation for pulsar-timing-array datasets with
variational inference and normalizing flows | 6 pages, 1 figure | null | null | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the gravitational-wave analysis of pulsar-timing-array datasets, parameter
estimation is usually performed using Markov Chain Monte Carlo methods to
explore posterior probability densities. We introduce an alternative procedure
that relies instead on stochastic gradient-descent Bayesian variational
inference, wher... | [
{
"created": "Tue, 14 May 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-05-16 | [
[
"Vallisneri",
"Michele",
""
],
[
"Crisostomi",
"Marco",
""
],
[
"Johnson",
"Aaron D.",
""
],
[
"Meyers",
"Patrick M.",
""
]
] | In the gravitational-wave analysis of pulsar-timing-array datasets, parameter estimation is usually performed using Markov Chain Monte Carlo methods to explore posterior probability densities. We introduce an alternative procedure that relies instead on stochastic gradient-descent Bayesian variational inference, whereb... |
1605.06635 | Michael Good | Michael R.R. Good, Paul R. Anderson, and Charles R. Evans | Mirror Reflections of a Black Hole | 25 pages, 7 figures | Phys. Rev. D 94, 065010 (2016) | 10.1103/PhysRevD.94.065010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exact correspondence between a black hole and an accelerating mirror is
demonstrated. It is shown that for a massless minimally coupled scalar field
the same Bogolubov coefficients connecting the "in" and "out" states occur for
a (1+1)D flat spacetime with a particular perfectly reflecting accelerating
boundary tr... | [
{
"created": "Sat, 21 May 2016 12:23:10 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Sep 2016 15:10:29 GMT",
"version": "v2"
}
] | 2016-09-26 | [
[
"Good",
"Michael R. R.",
""
],
[
"Anderson",
"Paul R.",
""
],
[
"Evans",
"Charles R.",
""
]
] | An exact correspondence between a black hole and an accelerating mirror is demonstrated. It is shown that for a massless minimally coupled scalar field the same Bogolubov coefficients connecting the "in" and "out" states occur for a (1+1)D flat spacetime with a particular perfectly reflecting accelerating boundary traj... |
gr-qc/0006045 | Marcus Ansorg | Marcus Ansorg | Differentially rotating disks of dust: Arbitrary rotation law | 23 pages, 3 figures, submitted to 'General Relativity and
Gravitation' | Gen.Rel.Grav. 33 (2001) 309-338 | 10.1023/A:1002705402248 | null | gr-qc | null | In this paper, solutions to the Ernst equation are investigated that depend
on two real analytic functions defined on the interval [0,1]. These solutions
are introduced by a suitable limiting process of Backlund transformations
applied to seed solutions of the Weyl class. It turns out that this class of
solutions con... | [
{
"created": "Tue, 13 Jun 2000 12:35:47 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Ansorg",
"Marcus",
""
]
] | In this paper, solutions to the Ernst equation are investigated that depend on two real analytic functions defined on the interval [0,1]. These solutions are introduced by a suitable limiting process of Backlund transformations applied to seed solutions of the Weyl class. It turns out that this class of solutions conta... |
1906.04048 | Pardyumn Kumar Sahoo | Parbati Sahoo, Annika Kirschner, P.K. Sahoo | Phantom fluid wormhole in $f(R,T)$ gravity | 12 pages, 8 Figures. Revision submitted to MPLA | Modern Physics Letters A 34(37), (2019), 1950303 | 10.1142/S0217732319503036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Wormholes (WHs) are considered as hypothetical shortcuts or tunnels in
spacetime. In general relativity (GR), the fundamental ingredient of WH
geometry is the presence of exotic matter at the throat, which is responsible
for the violation of null energy condition (NEC). However, the modified gravity
theories has show... | [
{
"created": "Fri, 7 Jun 2019 16:01:13 GMT",
"version": "v1"
}
] | 2020-02-19 | [
[
"Sahoo",
"Parbati",
""
],
[
"Kirschner",
"Annika",
""
],
[
"Sahoo",
"P. K.",
""
]
] | Wormholes (WHs) are considered as hypothetical shortcuts or tunnels in spacetime. In general relativity (GR), the fundamental ingredient of WH geometry is the presence of exotic matter at the throat, which is responsible for the violation of null energy condition (NEC). However, the modified gravity theories has shown ... |
gr-qc/9806084 | Dr. BG Sidharth | B.G. Sidharth | Space Time Quantization and the Big Bang | 5 pages, TeX | null | null | null | gr-qc | null | A recent cosmological model is recapitulated which deduces the correct mass,
radius and age of the universe as also the Hubble constant and other well known
apparently coincidental relations. It also predicts an ever expanding
accelerating universe as is confirmed by latest supernovae observations.
Finally the Big Ba... | [
{
"created": "Sun, 21 Jun 1998 02:49:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sidharth",
"B. G.",
""
]
] | A recent cosmological model is recapitulated which deduces the correct mass, radius and age of the universe as also the Hubble constant and other well known apparently coincidental relations. It also predicts an ever expanding accelerating universe as is confirmed by latest supernovae observations. Finally the Big Bang... |
gr-qc/9903077 | N. K. Dadhich | Naresh Dadhich and L.K. Patel | A simple shear-free non-singular spherical model with heat flux | 7 pages, LaTEX version | Grav.Cosmol. 6 (2000) 11-13 | null | IUCAA-14/99 | gr-qc | null | We obtain an exact simple solution of the Einstein equation describing a
spherically symmetric cosmological model without the big-bang or any other kind
of singularity. The matter content of the model is shear free isotropic fluid
with radial heat flux and it satisfies the weak and strong energy conditions.
It is pre... | [
{
"created": "Sat, 20 Mar 1999 07:14:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dadhich",
"Naresh",
""
],
[
"Patel",
"L. K.",
""
]
] | We obtain an exact simple solution of the Einstein equation describing a spherically symmetric cosmological model without the big-bang or any other kind of singularity. The matter content of the model is shear free isotropic fluid with radial heat flux and it satisfies the weak and strong energy conditions. It is press... |
0901.0603 | Li Xiang | Li Xiang and X. Q. Wen | Black hole thermodynamics with generalized uncertainty principle | 18 pages, great improvement on the first version; a Kerr-Newman black
hole is considered | JHEP 0910:046,2009 | 10.1088/1126-6708/2009/10/046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the standard viewpoint, the temperature of a stationary black hole is
proportional to its surface gravity, $T_H=\hbar\kappa/2\pi$. This is a
semiclassical result and the quantum gravity effects are not taken into
consideration. This Letter explores a unified expression for the black hole
temperature in the sense o... | [
{
"created": "Tue, 6 Jan 2009 08:06:13 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Mar 2009 16:06:11 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Xiang",
"Li",
""
],
[
"Wen",
"X. Q.",
""
]
] | In the standard viewpoint, the temperature of a stationary black hole is proportional to its surface gravity, $T_H=\hbar\kappa/2\pi$. This is a semiclassical result and the quantum gravity effects are not taken into consideration. This Letter explores a unified expression for the black hole temperature in the sense of ... |
2105.04283 | Guillaume Boileau | Guillaume Boileau, Astrid Lamberts, Nelson Christensen, Neil J.
Cornish, Renate Meyer | Spectral separation of the stochastic gravitational-wave background for
LISA in the context of a modulated Galactic foreground | null | null | 10.1093/mnras/stab2575 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within its observational band the Laser Interferometer Space Antenna, LISA,
will simultaneously observe orbital modulated waveforms from Galactic white
dwarf binaries, a binary black hole produced gravitational-wave background, and
potentially a cosmologically created stochastic gravitational-wave background
(SGWB). ... | [
{
"created": "Mon, 10 May 2021 11:48:15 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 2021 11:21:18 GMT",
"version": "v2"
}
] | 2021-10-08 | [
[
"Boileau",
"Guillaume",
""
],
[
"Lamberts",
"Astrid",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Cornish",
"Neil J.",
""
],
[
"Meyer",
"Renate",
""
]
] | Within its observational band the Laser Interferometer Space Antenna, LISA, will simultaneously observe orbital modulated waveforms from Galactic white dwarf binaries, a binary black hole produced gravitational-wave background, and potentially a cosmologically created stochastic gravitational-wave background (SGWB). Th... |
2309.14375 | Vladimir Kassandrov | Vladimir V. Kassandrov and Ildus Sh. Khasanov | The algebrodynamics: super-conservative collective dynamics on a "Unique
Worldline'' and the Hubble's law | 7 pages | Gravitation and Cosmology, 2023, Vol.29, No.1, pp.50-56 | 10.1134/S0202289323010048 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the properties of roots of a polynomial system of equations which
define a set of identical point particles located on a Unique Worldline (UW),
in the spirit of the old Wheeler-Feynman's conception. As a consequence of the
Vieta's formulas, a great number of conservation laws is fulfilled for
collective alge... | [
{
"created": "Sun, 24 Sep 2023 12:06:01 GMT",
"version": "v1"
}
] | 2023-09-27 | [
[
"Kassandrov",
"Vladimir V.",
""
],
[
"Khasanov",
"Ildus Sh.",
""
]
] | We study the properties of roots of a polynomial system of equations which define a set of identical point particles located on a Unique Worldline (UW), in the spirit of the old Wheeler-Feynman's conception. As a consequence of the Vieta's formulas, a great number of conservation laws is fulfilled for collective algebr... |
2310.07872 | Patryk Mach | Patryk Mach, Adam Cie\'slik, Andrzej Odrzywolek | Monte Carlo methods for stationary solutions of general-relativistic
Vlasov systems: Collisionless accretion onto black holes | 21 pages, 16 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a Monte Carlo simulation method for computing stationary solutions
of the general-relativistic Vlasov equation describing a gas of non-colliding
particles. As specific examples, we select planar or spherically symmetric
accretion models on the Schwarzschild background spacetime. In all cases the
gas extend... | [
{
"created": "Wed, 11 Oct 2023 20:25:36 GMT",
"version": "v1"
}
] | 2023-10-13 | [
[
"Mach",
"Patryk",
""
],
[
"Cieślik",
"Adam",
""
],
[
"Odrzywolek",
"Andrzej",
""
]
] | We develop a Monte Carlo simulation method for computing stationary solutions of the general-relativistic Vlasov equation describing a gas of non-colliding particles. As specific examples, we select planar or spherically symmetric accretion models on the Schwarzschild background spacetime. In all cases the gas extends ... |
1704.08311 | Alvaro de la Cruz-Dombriz | Artyom V. Astashenok (1), Alvaro de la Cruz-Dombriz (2) and Sergei D.
Odintsov (3) ((1) I. Kant Baltic Federal University, (2) Cape Town U., Dept.
Math. & Cape Town U., Cosmology & Gravity group, (3) ICREA and IEEC-CSIC) | The realistic models of relativistic stars in f(R) = R + alpha R^2
gravity | Version published in Class. Quantum Grav. 34 (2017) 205008, 15 pages,
11 figures, 3 tables, conclusions unchanged | Class. Quantum Grav. 34 (2017) 205008 | 10.1088/1361-6382/aa8971 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of f(R)=R + alpha R^2 gravity, we study the existence of
neutron and quark stars with no intermediate approximations in the generalised
system of Tolman-Oppenheimer-Volkov equations. Analysis shows that for positive
alpha's the scalar curvature does not drop to zero at the star surface (as in
General R... | [
{
"created": "Wed, 26 Apr 2017 19:22:16 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 2017 07:52:44 GMT",
"version": "v2"
}
] | 2017-10-04 | [
[
"Astashenok",
"Artyom V.",
""
],
[
"de la Cruz-Dombriz",
"Alvaro",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | In the context of f(R)=R + alpha R^2 gravity, we study the existence of neutron and quark stars with no intermediate approximations in the generalised system of Tolman-Oppenheimer-Volkov equations. Analysis shows that for positive alpha's the scalar curvature does not drop to zero at the star surface (as in General Rel... |
0910.1323 | Sonia Markes | Sonia Markes and Lucien Hardy | Entropy for theories with indefinite causal structure | 11 pages, 2 figures | J.Phys.Conf.Ser.306:012043,2011 | 10.1088/1742-6596/306/1/012043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Entropy is a concept that has traditionally been reliant on a definite notion
of causality. However, without a definite notion of causality, the concept of
entropy is not all lost. Indefinite causal structure results from combining
probabilistic predictions and dynamical space-time. Combining the probabilistic
nature... | [
{
"created": "Wed, 7 Oct 2009 17:26:15 GMT",
"version": "v1"
}
] | 2011-07-13 | [
[
"Markes",
"Sonia",
""
],
[
"Hardy",
"Lucien",
""
]
] | Entropy is a concept that has traditionally been reliant on a definite notion of causality. However, without a definite notion of causality, the concept of entropy is not all lost. Indefinite causal structure results from combining probabilistic predictions and dynamical space-time. Combining the probabilistic nature o... |
gr-qc/0507011 | Sanjit Mitra | S. Mitra, S. V. Dhurandhar and L. S. Finn | Improving the efficiency of the detection of gravitational wave signals
from inspiraling compact binaries: Chebyshev interpolation | 23 pages, 5 figures, submitted to Phys. Rev. D | Phys.Rev. D72 (2005) 102001 | 10.1103/PhysRevD.72.102001 | IUCAA - 19/05 | gr-qc | null | Inspiraling compact binaries are promising sources of gravitational waves for
ground and space-based laser interferometric detectors. The time-dependent
signature of these sources in the detectors is a well-characterized function of
a relatively small number of parameters; thus, the favored analysis technique
makes u... | [
{
"created": "Mon, 4 Jul 2005 05:24:09 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Mitra",
"S.",
""
],
[
"Dhurandhar",
"S. V.",
""
],
[
"Finn",
"L. S.",
""
]
] | Inspiraling compact binaries are promising sources of gravitational waves for ground and space-based laser interferometric detectors. The time-dependent signature of these sources in the detectors is a well-characterized function of a relatively small number of parameters; thus, the favored analysis technique makes use... |
2108.07023 | Quentin Ansel | Quentin Ansel | Loop quantum gravity with optimal control path integral, and application
to black hole tunneling | 25 pages, 5 figures, source codes in supplementary materials | null | 10.1007/s10714-022-02923-6 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents a novel path integral formalism for Einstein's theory of
gravitation from the viewpoint of optimal control theory. Despite its close
relation to the well-known variational principles of physicists, optimal
control turns out to be more general. Within this context, a Lagrangian
different from the E... | [
{
"created": "Mon, 16 Aug 2021 11:24:22 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Aug 2021 08:32:43 GMT",
"version": "v2"
}
] | 2022-05-11 | [
[
"Ansel",
"Quentin",
""
]
] | This paper presents a novel path integral formalism for Einstein's theory of gravitation from the viewpoint of optimal control theory. Despite its close relation to the well-known variational principles of physicists, optimal control turns out to be more general. Within this context, a Lagrangian different from the Ein... |
2205.03842 | Shokoufe Faraji | Shokoufe Faraji, Audrey Trova, Hernando Quevedo | Relativistic equilibrium fluid configurations around rotating deformed
compact objects | null | null | 10.1140/epjc/s10052-022-11075-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the physical properties of equilibrium sequences of
non-self-gravitating surfaces that characterize thick disks around a rotating
deformed compact object described by a stationary generalization of the static
q-metric. The spacetime corresponds to an exact solution of Einstein's field
equations so that... | [
{
"created": "Sun, 8 May 2022 11:55:17 GMT",
"version": "v1"
}
] | 2023-01-04 | [
[
"Faraji",
"Shokoufe",
""
],
[
"Trova",
"Audrey",
""
],
[
"Quevedo",
"Hernando",
""
]
] | We investigate the physical properties of equilibrium sequences of non-self-gravitating surfaces that characterize thick disks around a rotating deformed compact object described by a stationary generalization of the static q-metric. The spacetime corresponds to an exact solution of Einstein's field equations so that w... |
gr-qc/0307061 | Yongge Ma | Xuejun Yang, Yongge Ma, Jianbing Shao, and Wei Zhou | Killing Reduction of 5-Dimensional Spacetimes | 9 pages, references added | Phys.Rev. D68 (2003) 024006 | 10.1103/PhysRevD.68.024006 | null | gr-qc hep-th | null | In a 5-dimensional spacetime ($M,g_{ab}$) with a Killing vector field $\xi
^a$ which is either everywhere timelike or everywhere spacelike, the collection
of all trajectories of $\xi ^a$ gives a 4-dimensional space $S$. The reduction
of ($M,g_{ab}$) is studied in the geometric language, which is a generalization
of G... | [
{
"created": "Sat, 12 Jul 2003 08:12:41 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 2003 03:26:17 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Yang",
"Xuejun",
""
],
[
"Ma",
"Yongge",
""
],
[
"Shao",
"Jianbing",
""
],
[
"Zhou",
"Wei",
""
]
] | In a 5-dimensional spacetime ($M,g_{ab}$) with a Killing vector field $\xi ^a$ which is either everywhere timelike or everywhere spacelike, the collection of all trajectories of $\xi ^a$ gives a 4-dimensional space $S$. The reduction of ($M,g_{ab}$) is studied in the geometric language, which is a generalization of Ger... |
1510.00085 | Shao-Wen Wei | Shao-Wen Wei, Peng Cheng, Yu-Xiao Liu | Analytical and exact critical phenomena of $d$-dimensional singly
spinning Kerr-AdS black holes | 16 pages, 9 figures, 3 tables | Phys. Rev. D 93, 084015 (2016) | 10.1103/PhysRevD.93.084015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the extended phase space, the $d$-dimensional singly spinning Kerr-AdS
black holes exhibit the van der Waals's phase transition and reentrant phase
transition. Since the black hole system is a single characteristic parameter
thermodynamic system, we show that the form of the critical point can be
uniquely determin... | [
{
"created": "Thu, 1 Oct 2015 01:36:26 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Apr 2016 02:45:43 GMT",
"version": "v2"
}
] | 2016-04-13 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Cheng",
"Peng",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | In the extended phase space, the $d$-dimensional singly spinning Kerr-AdS black holes exhibit the van der Waals's phase transition and reentrant phase transition. Since the black hole system is a single characteristic parameter thermodynamic system, we show that the form of the critical point can be uniquely determined... |
1812.06970 | Ido Ben-Dayan | Ido Ben-Dayan, Judy Kupferman | Sourced Scalar Fluctuations in Bouncing Cosmology | Corrected an error in writing the coupling to the gauge field in
terms of the scalar field and the corresponding equations. As a result, the
prediction is r=1/9. Matches the published erratum | JCAP 2019 (2019) no.07, 050, JCAP 12 (2020) E01 (erratum) | 10.1088/1475-7516/2019/07/050 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the scalar power spectrum generated by sourced fluctuations due
to coupling between the scalar field, which holds most of the energy density of
the universe, and a gauge field for a general FLRW metric. For this purpose we
calculate the curvature perturbation to second order in the presence of gauge
fiel... | [
{
"created": "Sun, 16 Dec 2018 21:01:05 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Aug 2019 20:35:08 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Feb 2021 17:11:22 GMT",
"version": "v3"
}
] | 2021-02-19 | [
[
"Ben-Dayan",
"Ido",
""
],
[
"Kupferman",
"Judy",
""
]
] | We calculate the scalar power spectrum generated by sourced fluctuations due to coupling between the scalar field, which holds most of the energy density of the universe, and a gauge field for a general FLRW metric. For this purpose we calculate the curvature perturbation to second order in the presence of gauge fields... |
1008.1127 | Francisco Lobo | Francisco S. N. Lobo | Closed timelike curves and causality violation | 19 pages, 6 figures. Invited chapter to appear in an edited
collection 'Classical and Quantum Gravity: Theory, Analysis and Applications' | Classical and Quantum Gravity: Theory, Analysis and Applications,
chap.6 , (2008), Nova Sci. Pub | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conceptual definition and understanding of time, both quantitatively and
qualitatively is of the utmost difficulty and importance. As time is
incorporated into the proper structure of the fabric of spacetime, it is
interesting to note that General Relativity is contaminated with non-trivial
geometries which gener... | [
{
"created": "Fri, 6 Aug 2010 07:24:39 GMT",
"version": "v1"
}
] | 2013-10-21 | [
[
"Lobo",
"Francisco S. N.",
""
]
] | The conceptual definition and understanding of time, both quantitatively and qualitatively is of the utmost difficulty and importance. As time is incorporated into the proper structure of the fabric of spacetime, it is interesting to note that General Relativity is contaminated with non-trivial geometries which generat... |
2008.04737 | Gabriele Umberto Varieschi | Gabriele U. Varieschi | Newtonian Fractional-Dimension Gravity and Disk Galaxies | 23 pages, including 6 figures: references added and other minor
changes after peer review. Final version to be published in The European
Physical Journal Plus, Springer | Eur. Phys. J. Plus 136, 183 (2021) | 10.1140/epjp/s13360-021-01165-w | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper continues previous work on a novel alternative model of gravity,
based on the theory of fractional-dimension spaces applied to Newton's law of
gravitation. In particular, our Newtonian Fractional-Dimension Gravity is now
applied to axially-symmetric structures, such as thin/thick disk galaxies
described by... | [
{
"created": "Sat, 8 Aug 2020 05:09:38 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2020 23:36:59 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Feb 2021 01:35:59 GMT",
"version": "v3"
}
] | 2021-02-15 | [
[
"Varieschi",
"Gabriele U.",
""
]
] | This paper continues previous work on a novel alternative model of gravity, based on the theory of fractional-dimension spaces applied to Newton's law of gravitation. In particular, our Newtonian Fractional-Dimension Gravity is now applied to axially-symmetric structures, such as thin/thick disk galaxies described by e... |
gr-qc/0701097 | Eri Mena | E. Mena, O. Obregon and M. Sabido | WKB-type Approximation to Noncommutative Quantum Cosmology | Revtex4, 6 pages, no figures | Int.J.Mod.Phys.D18:95-106,2009 | 10.1142/S0218271809014376 | null | gr-qc | null | In this work, we develop and apply the WKB approximation to several examples
of noncommutative quantum cosmology, obtaining the time evolution of the
noncommutative universe, this is done starting from a noncommutative quantum
formulation of cosmology where the noncommutativity is introduced by a
deformation on the m... | [
{
"created": "Tue, 16 Jan 2007 23:12:49 GMT",
"version": "v1"
}
] | 2009-03-24 | [
[
"Mena",
"E.",
""
],
[
"Obregon",
"O.",
""
],
[
"Sabido",
"M.",
""
]
] | In this work, we develop and apply the WKB approximation to several examples of noncommutative quantum cosmology, obtaining the time evolution of the noncommutative universe, this is done starting from a noncommutative quantum formulation of cosmology where the noncommutativity is introduced by a deformation on the min... |
gr-qc/9503064 | Troy Schilling | Troy A. Schilling | Non-covariance of the generalized holonomies: Examples | Silly LaTeX error fixed so that figure is properly included | J.Math.Phys.37:4041-4052,1996 | 10.1063/1.531615 | GCPG-95/3-1 | gr-qc | null | A key aspect of a recent proposal for a {\em generalized loop representation}
of quantum Yang-Mills theory and gravity is considered. Such a representation
of the quantum theory has been expected to arise via consideration of a
particular algebra of observables -- given by the traces of the holonomies of
{\em general... | [
{
"created": "Fri, 31 Mar 1995 21:50:30 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Apr 1995 02:03:25 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Schilling",
"Troy A.",
""
]
] | A key aspect of a recent proposal for a {\em generalized loop representation} of quantum Yang-Mills theory and gravity is considered. Such a representation of the quantum theory has been expected to arise via consideration of a particular algebra of observables -- given by the traces of the holonomies of {\em generaliz... |
1911.09639 | Marcin Kisielowski PhD | Marcin Kisielowski | Homogeneous-isotropic sector of loop quantum gravity: new approach | [v2] Published version. This is an open access article distributed
under the terms of the Creative Commons Attribution 4.0 License. Any further
distribution of this work must maintain attribution to the author and the
title of the work, journal citation and DOI | Class. Quantum Grav. 37 (2020) 185004 | 10.1088/1361-6382/ab9bb9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Recently, a new class of scalar constraint operators has been introduced in
loop quantum gravity. They are defined on a space of solutions to the Gauss
constraint and partial solutions to the vector constraint, called a vertex
Hilbert space. We propose a subspace of the vertex Hilbert space formed by
homogeneous-isot... | [
{
"created": "Thu, 21 Nov 2019 17:52:41 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Apr 2021 10:55:08 GMT",
"version": "v2"
}
] | 2021-05-03 | [
[
"Kisielowski",
"Marcin",
""
]
] | Recently, a new class of scalar constraint operators has been introduced in loop quantum gravity. They are defined on a space of solutions to the Gauss constraint and partial solutions to the vector constraint, called a vertex Hilbert space. We propose a subspace of the vertex Hilbert space formed by homogeneous-isotro... |
1507.07845 | Yen Chin Ong | Yen Chin Ong | Hawking Evaporation Time Scale of Topological Black Holes in Anti-de
Sitter Spacetime | Published version | Nucl. Phys. B 903 (2016) 387 | 10.1016/j.nuclphysb.2016.01.005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was recently pointed out that if an absorbing boundary condition is
imposed at infinity, an asymptotically anti-de Sitter Schwarzschild black hole
with a spherical horizon takes only a finite amount of time to evaporate away
even if its initial mass is arbitrarily large. We show that this is a rather
generic prope... | [
{
"created": "Tue, 28 Jul 2015 16:55:33 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Feb 2016 21:26:05 GMT",
"version": "v2"
}
] | 2016-02-16 | [
[
"Ong",
"Yen Chin",
""
]
] | It was recently pointed out that if an absorbing boundary condition is imposed at infinity, an asymptotically anti-de Sitter Schwarzschild black hole with a spherical horizon takes only a finite amount of time to evaporate away even if its initial mass is arbitrarily large. We show that this is a rather generic propert... |
2403.09388 | Che-Yu Chen | Che-Yu Chen, Yuki Yokokura | Imaging a semi-classical horizonless compact object with strong redshift | 15 pages, 10 figures. Matching published version | Phys. Rev. D 109 (2024) 104058 | 10.1103/PhysRevD.109.104058 | RIKEN-iTHEMS-Report-24 | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent advancements in black hole imaging have opened a new era of
probing horizon-scale physics with electromagnetic radiation. However, a
feature of the observed images, a bright ring encircling a relatively dark
region, has not sufficiently proved the existence of event horizons. It thus
requires extreme care ... | [
{
"created": "Thu, 14 Mar 2024 13:39:18 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2024 08:47:48 GMT",
"version": "v2"
}
] | 2024-05-22 | [
[
"Chen",
"Che-Yu",
""
],
[
"Yokokura",
"Yuki",
""
]
] | The recent advancements in black hole imaging have opened a new era of probing horizon-scale physics with electromagnetic radiation. However, a feature of the observed images, a bright ring encircling a relatively dark region, has not sufficiently proved the existence of event horizons. It thus requires extreme care wh... |
1010.1124 | Stefan Danilishin | Farid Khalili, Stefan Danilishin, Helge Mueller-Ebhardt, Haixing Miao,
Yanbei Chen and Chunnong Zhao | Negative optical inertia for enhancing the sensitivity of future
gravitational-wave detectors | 7 pages, 3 figures | Phys.Rev.D83:062003,2011 | 10.1103/PhysRevD.83.062003 | null | gr-qc physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider enhancing the sensitivity of future gravitational-wave detectors
by using double optical spring. When the power, detuning and bandwidth of the
two carriers are chosen appropriately, the effect of the double optical spring
can be described as a "negative inertia", which cancels the positive inertia of
the ... | [
{
"created": "Wed, 6 Oct 2010 11:21:52 GMT",
"version": "v1"
}
] | 2011-03-22 | [
[
"Khalili",
"Farid",
""
],
[
"Danilishin",
"Stefan",
""
],
[
"Mueller-Ebhardt",
"Helge",
""
],
[
"Miao",
"Haixing",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Zhao",
"Chunnong",
""
]
] | We consider enhancing the sensitivity of future gravitational-wave detectors by using double optical spring. When the power, detuning and bandwidth of the two carriers are chosen appropriately, the effect of the double optical spring can be described as a "negative inertia", which cancels the positive inertia of the te... |
gr-qc/0607125 | Farook Rahaman | F.Rahaman, M.Kalam, R.Mondal and B.Raychaudhuri | Global monopole, dark matter and scalar tensor theory | 8 pages, Accepted in Mod. Phys. Lett. A | Mod.Phys.Lett.A22:971-978,2007 | 10.1142/S0217732307021317 | null | gr-qc | null | In this article, we discuss the space-time of a global monopole field as a
candidate for galactic dark matter in the context of scalar tensor theory.
| [
{
"created": "Thu, 27 Jul 2006 08:50:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rahaman",
"F.",
""
],
[
"Kalam",
"M.",
""
],
[
"Mondal",
"R.",
""
],
[
"Raychaudhuri",
"B.",
""
]
] | In this article, we discuss the space-time of a global monopole field as a candidate for galactic dark matter in the context of scalar tensor theory. |
2107.14522 | Fabrizio Esposito | Fabrizio Esposito, Sante Carloni, Roberto Cianci, Stefano Vignolo | Reconstructing isotropic and anisotropic $f(\mathcal{Q})$ cosmologies | 12 pages, 16 figures | Phys. Rev. D 105, 084061 (2022) | 10.1103/PhysRevD.105.084061 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a reconstruction algorithm for cosmological models based on
$f(\mathcal{Q})$ gravity. We specifically focus on obtaining exact Bianchi
Type-I and Friedmann-Lema\^{\i}tre-Robertson-Walker solutions, finding
solutions that might have application in a variety of scenarios such as
spontaneous isotropization of... | [
{
"created": "Fri, 30 Jul 2021 10:10:39 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 2021 08:06:54 GMT",
"version": "v2"
},
{
"created": "Wed, 11 May 2022 09:47:36 GMT",
"version": "v3"
}
] | 2022-05-12 | [
[
"Esposito",
"Fabrizio",
""
],
[
"Carloni",
"Sante",
""
],
[
"Cianci",
"Roberto",
""
],
[
"Vignolo",
"Stefano",
""
]
] | We present a reconstruction algorithm for cosmological models based on $f(\mathcal{Q})$ gravity. We specifically focus on obtaining exact Bianchi Type-I and Friedmann-Lema\^{\i}tre-Robertson-Walker solutions, finding solutions that might have application in a variety of scenarios such as spontaneous isotropization of B... |
2309.10282 | Vinod Kumar Bhardwaj Dr. | Vinod Kumar Bhardwaj, Anil Kumar Yadav, Lalit Kumar Gupta, Rajendra
Prasad, Sudhir Kumar Srivastava | Constraining hybrid potential scalar field cosmological model in Lyra's
geometry with recent observational data | 24 pages, 12 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In the current study, we investigate a scalar field cosmological model with
Lyra's geometry to explain the present cosmic expansion in a homogeneous and
isotropic flat FRW universe. In Einstein's field equations, we presupposed a
variable displacement vector as an element of Lyra's geometry. In the context
of the con... | [
{
"created": "Tue, 19 Sep 2023 03:11:07 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jul 2024 06:37:36 GMT",
"version": "v2"
}
] | 2024-07-16 | [
[
"Bhardwaj",
"Vinod Kumar",
""
],
[
"Yadav",
"Anil Kumar",
""
],
[
"Gupta",
"Lalit Kumar",
""
],
[
"Prasad",
"Rajendra",
""
],
[
"Srivastava",
"Sudhir Kumar",
""
]
] | In the current study, we investigate a scalar field cosmological model with Lyra's geometry to explain the present cosmic expansion in a homogeneous and isotropic flat FRW universe. In Einstein's field equations, we presupposed a variable displacement vector as an element of Lyra's geometry. In the context of the conve... |
gr-qc/9902082 | Leor Barack | Leor Barack and Amos Ori | Late-time decay of scalar perturbations outside rotating black holes | Submitted to PRL in 16Nov98, resubmitted in 3Feb99; Reference added | Phys.Rev.Lett. 82 (1999) 4388 | 10.1103/PhysRevLett.82.4388 | null | gr-qc | null | We present an analytic method for calculating the late-time tails of a linear
scalar field outside a Kerr black hole. We give the asymptotic behavior at
timelike infinity (for fixed $r$), at future null infinity, and along the event
horizon (EH). In all three asymptotic regions we find a power-law decay. We
show that... | [
{
"created": "Thu, 25 Feb 1999 21:07:47 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Feb 1999 20:13:15 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Barack",
"Leor",
""
],
[
"Ori",
"Amos",
""
]
] | We present an analytic method for calculating the late-time tails of a linear scalar field outside a Kerr black hole. We give the asymptotic behavior at timelike infinity (for fixed $r$), at future null infinity, and along the event horizon (EH). In all three asymptotic regions we find a power-law decay. We show that t... |
2207.10039 | Bernardo Araneda | Steffen Aksteiner, Bernardo Araneda | Kaehler geometry of black holes and gravitational instantons | 6 pages | null | 10.1103/PhysRevLett.130.161502 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We obtain a closed formula for the Kaehler potential of a broad class of
four-dimensional Lorentzian or Euclidean conformal "Kaehler" geometries,
including the Plebanski-Demianski class and various gravitational instantons
such as Fubini-Study and Chen-Teo. We show that the Kaehler potentials of
Schwarzschild and Ker... | [
{
"created": "Wed, 20 Jul 2022 17:08:18 GMT",
"version": "v1"
}
] | 2023-05-03 | [
[
"Aksteiner",
"Steffen",
""
],
[
"Araneda",
"Bernardo",
""
]
] | We obtain a closed formula for the Kaehler potential of a broad class of four-dimensional Lorentzian or Euclidean conformal "Kaehler" geometries, including the Plebanski-Demianski class and various gravitational instantons such as Fubini-Study and Chen-Teo. We show that the Kaehler potentials of Schwarzschild and Kerr ... |
2002.03186 | Tiberiu Harko | Shahab Shahidi, Tiberiu Harko, Zolt\'an Kov\'acs | Distinguishing Brans-Dicke-Kerr type naked singularities and black holes
with their thin disk electromagnetic radiation properties | 20 pages, 6 figures, accepted for publication in EPJC; references
added | The European Physical Journal C 80, 162 (2020) | 10.1140/epjc/s10052-020-7736-x | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible existence of naked singularities, hypothetical astrophysical
objects, characterized by a gravitational singularity without an event horizon
is still an open problem in present day astrophysics. From an observational
point of view distinguishing between astrophysical black holes and naked
singularities al... | [
{
"created": "Sat, 8 Feb 2020 15:37:20 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2020 08:25:29 GMT",
"version": "v2"
}
] | 2020-05-19 | [
[
"Shahidi",
"Shahab",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Kovács",
"Zoltán",
""
]
] | The possible existence of naked singularities, hypothetical astrophysical objects, characterized by a gravitational singularity without an event horizon is still an open problem in present day astrophysics. From an observational point of view distinguishing between astrophysical black holes and naked singularities also... |
1105.1540 | Yuri Pavlov | A. A. Grib, Yu. V. Pavlov, O. F. Piattella | High energy processes in the vicinity of the Kerr's black hole horizon | 13 pages, 2 figures, added some formulas and one reference | Int. J. Mod. Phys. A 26, No. 22 (2011) 3856-3867 | 10.1142/S0217751X11054310 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two particle collisions close to the horizon of the rotating nonextremal
black hole are analyzed. It is shown that high energy of the order of the Grand
Unification scale in the centre of mass of colliding particles can be obtained
when there is a multiple collision - the particle from the accretion disc gets
the cri... | [
{
"created": "Sun, 8 May 2011 18:11:32 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2011 15:29:18 GMT",
"version": "v2"
}
] | 2012-03-23 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
],
[
"Piattella",
"O. F.",
""
]
] | Two particle collisions close to the horizon of the rotating nonextremal black hole are analyzed. It is shown that high energy of the order of the Grand Unification scale in the centre of mass of colliding particles can be obtained when there is a multiple collision - the particle from the accretion disc gets the criti... |
gr-qc/0508035 | David Delphenich | David Delphenich | Symmetries and pre-metric electromagnetism | 53 pages. Annalen der Physik (Leipzig) (2005), to be published | AnnalenPhys.14:663-704,2005 | 10.1002/andp.200510159 | null | gr-qc hep-th | null | The equations of pre-metric electromagnetism are formulated as an exterior
differential system on the bundle of exterior differential 2-forms over the
spacetime manifold. The general form for the symmetry equations of the system
is computed and then specialized to various possible forms for an
electromagnetic constit... | [
{
"created": "Tue, 9 Aug 2005 20:15:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Delphenich",
"David",
""
]
] | The equations of pre-metric electromagnetism are formulated as an exterior differential system on the bundle of exterior differential 2-forms over the spacetime manifold. The general form for the symmetry equations of the system is computed and then specialized to various possible forms for an electromagnetic constitut... |
gr-qc/9707056 | Yoonbai Kim | Nakwoo Kim, Yoonbai Kim and Kyoungtae Kimm | Global Vortex and Black Cosmic String | 35 pages, Latex | Phys.Rev. D56 (1997) 8029-8044 | 10.1103/PhysRevD.56.8029 | SNUTP-97-088 | gr-qc hep-th | null | We study global vortices coupled to (2+1) dimensional gravity with negative
cosmological constant. We found nonsingular vortex solutions in $\phi^4$-theory
with a broken U(1) symmetry, of which the spacetimes do not involve physical
curvature singularity. When the magnitude of negative cosmological constant is
larger... | [
{
"created": "Sun, 27 Jul 1997 10:20:13 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Kim",
"Nakwoo",
""
],
[
"Kim",
"Yoonbai",
""
],
[
"Kimm",
"Kyoungtae",
""
]
] | We study global vortices coupled to (2+1) dimensional gravity with negative cosmological constant. We found nonsingular vortex solutions in $\phi^4$-theory with a broken U(1) symmetry, of which the spacetimes do not involve physical curvature singularity. When the magnitude of negative cosmological constant is larger t... |
1806.03924 | Jakub Mielczarek Ph.D. | Michal Artymowski, Jakub Mielczarek | Quantum Hubble horizon | 15 pages, 3 figures | null | 10.1140/epjc/s10052-019-7131-7 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The article addresses a possibility of obtaining cosmologically relevant
effects from the quantum nature of the Hubble horizon. Following the
observation made by E.~Bianchi and C.~Rovelli in Phys.\ Rev.\ D {\bf 84} (2011)
027502 we explore relationship between the Planck scale discreteness of the
Hubble horizon and d... | [
{
"created": "Mon, 11 Jun 2018 11:43:45 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Artymowski",
"Michal",
""
],
[
"Mielczarek",
"Jakub",
""
]
] | The article addresses a possibility of obtaining cosmologically relevant effects from the quantum nature of the Hubble horizon. Following the observation made by E.~Bianchi and C.~Rovelli in Phys.\ Rev.\ D {\bf 84} (2011) 027502 we explore relationship between the Planck scale discreteness of the Hubble horizon and def... |
gr-qc/0602020 | Plyatsko Roman | Roman Plyatsko | Some partial solutions of Mathisson-Papapetrou equations in a
Schwarzschild field | 27 pages, 8 figures | null | null | null | gr-qc | null | The analytical and numerical solutions of the Mathisson-Papapetrou equations
under the Mathisson-Pirani supplementary condition describing highly
relativistic (ultrarelativistic) motions of a spinning particle in a
Schwarzschild field are investigated. The known condition S/mr<<1, which is
necessary for a test partic... | [
{
"created": "Mon, 6 Feb 2006 14:21:40 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Feb 2006 09:28:24 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Plyatsko",
"Roman",
""
]
] | The analytical and numerical solutions of the Mathisson-Papapetrou equations under the Mathisson-Pirani supplementary condition describing highly relativistic (ultrarelativistic) motions of a spinning particle in a Schwarzschild field are investigated. The known condition S/mr<<1, which is necessary for a test particle... |
1511.03578 | Maria Laura Pucheu | F. Briscese and M. L. Pucheu | Palatini formulation of non-local gravity | 10 pages | null | 10.1142/S0219887817500190 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the dynamical equations for a non-local gravity model in the
Palatini formalism and we discuss some of the properties of this model. We have
shown that, in some specific cases, the vacuum solutions of general relativity
are also vacuum solutions of the non-local model, so we conclude that, at least
in this ... | [
{
"created": "Wed, 11 Nov 2015 17:11:43 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2016 22:27:33 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Nov 2016 12:42:11 GMT",
"version": "v3"
}
] | 2016-12-16 | [
[
"Briscese",
"F.",
""
],
[
"Pucheu",
"M. L.",
""
]
] | We derive the dynamical equations for a non-local gravity model in the Palatini formalism and we discuss some of the properties of this model. We have shown that, in some specific cases, the vacuum solutions of general relativity are also vacuum solutions of the non-local model, so we conclude that, at least in this ca... |
1912.04604 | Mar\'ia Jos\'e Guzm\'an | Alexey Golovnev, Maria Jose Guzman | Disformal transformations in modified teleparallel gravity | 12 pages, no figures; prepared for proceedings of the 10th
Mathematical Physics Meeting: School and Conference on Modern Mathematical
Physics, 9 - 14 September 2019, Belgrade, Serbia, in which one of us (AG)
participated; matches the published version | Symmetry 12 (2020) 152 | 10.3390/sym12010152 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this work, we explore disformal transformations in the context of the
teleparallel equivalent of general relativity and modified teleparallel
gravity. We present explicit formulas in components for disformal
transformations of the main geometric objects in these theories such as torsion
tensor, torsion vector and ... | [
{
"created": "Tue, 10 Dec 2019 10:01:20 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jan 2020 03:22:18 GMT",
"version": "v2"
}
] | 2020-01-15 | [
[
"Golovnev",
"Alexey",
""
],
[
"Guzman",
"Maria Jose",
""
]
] | In this work, we explore disformal transformations in the context of the teleparallel equivalent of general relativity and modified teleparallel gravity. We present explicit formulas in components for disformal transformations of the main geometric objects in these theories such as torsion tensor, torsion vector and co... |
gr-qc/0307001 | Richard O'Shaughenssy | R. O'Shaughnessy | Geometrical optics analysis of the short-time stability properties of
the Einstein evolution equations | Submitted to Phys. Rev. D | Phys.Rev.D68:084024,2003 | 10.1103/PhysRevD.68.084024 | null | gr-qc | null | Many alternative formulations of Einstein's evolution have lately been
examined, in an effort to discover one which yields slow growth of
constraint-violating errors. In this paper, rather than directly search for
well-behaved formulations, we instead develop analytic tools to discover which
formulations are particul... | [
{
"created": "Mon, 30 Jun 2003 20:08:07 GMT",
"version": "v1"
}
] | 2009-04-03 | [
[
"O'Shaughnessy",
"R.",
""
]
] | Many alternative formulations of Einstein's evolution have lately been examined, in an effort to discover one which yields slow growth of constraint-violating errors. In this paper, rather than directly search for well-behaved formulations, we instead develop analytic tools to discover which formulations are particular... |
0801.0212 | Sergey Cherkas L | K. A. Viarenich, V. L. Kalashnikov, S. L. Cherkas | Quantum mechanics of the closed collapsing Universe | 8 pages 1 figire | Vestnik Belarus State U., ser. Fiz. 2 (2007) 3-7 | null | null | gr-qc | null | Two approaches to quantization of Freedman's closed Universe are compared. In
the first approach, the Shrodinger's norm of the wave function of Universe is
used, and in the second approach, the Klein-Gordon's norm is used. The second
one allows building the quasi-Heisenberg operators as functions of time and
finding ... | [
{
"created": "Mon, 31 Dec 2007 14:52:18 GMT",
"version": "v1"
}
] | 2008-01-03 | [
[
"Viarenich",
"K. A.",
""
],
[
"Kalashnikov",
"V. L.",
""
],
[
"Cherkas",
"S. L.",
""
]
] | Two approaches to quantization of Freedman's closed Universe are compared. In the first approach, the Shrodinger's norm of the wave function of Universe is used, and in the second approach, the Klein-Gordon's norm is used. The second one allows building the quasi-Heisenberg operators as functions of time and finding th... |
0705.1565 | Christopher Eling | Christopher Eling, Ted Jacobson, M. Coleman Miller | Neutron stars in Einstein-aether theory | 25 pages, 4 figures; v2: simplified the discussion of aether-matter
couplings, removed one extraneous mass vs. pressure plot, added brief
discussion of ae-theory effects in Ozel's mass determination method; v3:
corrected the equation for aether stress tensor, results unchanged since
correct form was used in cal... | Phys.Rev.D76:042003,2007; Erratum-ibid.D80:129906,2009 | 10.1103/PhysRevD.76.042003 10.1103/PhysRevD.80.129906 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As current and future experiments probe strong gravitational regimes around
neutron stars and black holes, it is desirable to have theoretically sound
alternatives to general relativity against which to test observations. Here we
study the consequences of one such generalization, Einstein-aether theory, for
the prope... | [
{
"created": "Thu, 10 May 2007 23:16:38 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2007 20:01:02 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Dec 2009 14:19:48 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Eling",
"Christopher",
""
],
[
"Jacobson",
"Ted",
""
],
[
"Miller",
"M. Coleman",
""
]
] | As current and future experiments probe strong gravitational regimes around neutron stars and black holes, it is desirable to have theoretically sound alternatives to general relativity against which to test observations. Here we study the consequences of one such generalization, Einstein-aether theory, for the propert... |
2107.05656 | Theodoros Nakas | Athanasios Bakopoulos and Theodoros Nakas | Analytic and asymptotically flat hairy (ultra-compact) black-hole
solutions and their axial perturbations | 23 pages, 8 figures, title changed, analysis extended, references
updated, typos corrected, matches published version (to appear in JHEP) | null | 10.1007/JHEP04(2022)096 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider a very simple gravitational theory that contains a
scalar field with its kinetic and potential terms minimally coupled to gravity,
while the scalar field is assumed to have a coulombic form. In the context of
this theory, we study an analytic, asymptotically flat, and regular
(ultra-compact)... | [
{
"created": "Mon, 12 Jul 2021 18:00:13 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2022 17:00:33 GMT",
"version": "v2"
}
] | 2022-04-21 | [
[
"Bakopoulos",
"Athanasios",
""
],
[
"Nakas",
"Theodoros",
""
]
] | In this work, we consider a very simple gravitational theory that contains a scalar field with its kinetic and potential terms minimally coupled to gravity, while the scalar field is assumed to have a coulombic form. In the context of this theory, we study an analytic, asymptotically flat, and regular (ultra-compact) b... |
gr-qc/0406005 | Grigory Volovik | G.E. Volovik | On thermodynamic and quantum fluctuations of cosmological constant | 4 pages, version submitted to JETP Letters | JETP Lett. 80 (2004) 465-468 | 10.1134/1.1839291 | null | gr-qc cond-mat.stat-mech hep-ph | null | We discuss from the condensed-matter point of view the recent idea that the
Poisson fluctuations of cosmological constant about zero could be a source of
the observed dark energy. We argue that the thermodynamic fluctuations of
Lambda are much bigger. Since the amplitude of fluctuations is proportional to
V^{-1/2}, w... | [
{
"created": "Wed, 2 Jun 2004 13:36:02 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jun 2004 12:26:58 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jul 2004 14:56:18 GMT",
"version": "v3"
},
{
"created": "Fri, 23 Jul 2004 13:55:49 GMT",
"version": "v4"
},
{
"cre... | 2009-11-10 | [
[
"Volovik",
"G. E.",
""
]
] | We discuss from the condensed-matter point of view the recent idea that the Poisson fluctuations of cosmological constant about zero could be a source of the observed dark energy. We argue that the thermodynamic fluctuations of Lambda are much bigger. Since the amplitude of fluctuations is proportional to V^{-1/2}, whe... |
1812.09623 | \.Izzet Sakall{\i} | \.Izzet Sakall{\i} and G\"ulnihal Tokg\"oz | Spectroscopy of Stringy Black Hole | Some typos have been fixed. 8 pages & 1 figure. The 10th
International Physics Conference of the Balkan Physical Union (BPU10), 26-30
August 2018. To be published in AIP Conference Proceedings in April 2019 | AIP Conference Proceedings 2075, 040001 (2019) | 10.1063/1.5091161 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Maggiore's method, which evaluates the transition frequency that appears
in the adiabatic invariant from the highly damped modes, is used to investigate
the entropy/area spectra of the Garfinkle-Horowitz-Strominger black hole
(GHS-BH). We compute the resonance modes of the GHS-BH by using the confined
scalar wave... | [
{
"created": "Sat, 22 Dec 2018 23:21:18 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Feb 2019 20:44:39 GMT",
"version": "v2"
}
] | 2020-02-11 | [
[
"Sakallı",
"İzzet",
""
],
[
"Tokgöz",
"Gülnihal",
""
]
] | The Maggiore's method, which evaluates the transition frequency that appears in the adiabatic invariant from the highly damped modes, is used to investigate the entropy/area spectra of the Garfinkle-Horowitz-Strominger black hole (GHS-BH). We compute the resonance modes of the GHS-BH by using the confined scalar waves ... |
gr-qc/0512027 | Peter Kuhfittig K.F. | Peter K.F. Kuhfittig | More on wormholes supported by small amounts of exotic matter | 8 pages AMSTeX; 3 figures added | Phys.Rev. D73 (2006) 084014 | 10.1103/PhysRevD.73.084014 | null | gr-qc | null | Recent papers by Fewster and Roman have emphasized that wormholes supported
by arbitrarily small amounts of exotic matter will have to be incredibly
fine-tuned if they are to be traversable. This paper discusses a wormhole model
that strikes a balance between two conflicting requirements, reducing the
amount of exoti... | [
{
"created": "Mon, 5 Dec 2005 15:34:59 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Apr 2006 20:24:13 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | Recent papers by Fewster and Roman have emphasized that wormholes supported by arbitrarily small amounts of exotic matter will have to be incredibly fine-tuned if they are to be traversable. This paper discusses a wormhole model that strikes a balance between two conflicting requirements, reducing the amount of exotic ... |
2401.12454 | Ming Chen | Ming Chen, Gabriele Tartaglino-Mazzucchelli, Yao-Zhong Zhang | Charged massless scalar fields in a charged $C$-metric black hole: Exact
solutions, Hawking radiation and scattering of scalar waves | 33 pages | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We study Hawking radiation and wave scattering of charged scalar fields in a
charged $C$-metric black hole background. The conformally invariant wave
equation for charged scalar fields can be separated into radial and angular
parts, each with five singularities. We show that the radial and angular
equations can be re... | [
{
"created": "Tue, 23 Jan 2024 02:50:12 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Feb 2024 01:00:10 GMT",
"version": "v2"
}
] | 2024-02-13 | [
[
"Chen",
"Ming",
""
],
[
"Tartaglino-Mazzucchelli",
"Gabriele",
""
],
[
"Zhang",
"Yao-Zhong",
""
]
] | We study Hawking radiation and wave scattering of charged scalar fields in a charged $C$-metric black hole background. The conformally invariant wave equation for charged scalar fields can be separated into radial and angular parts, each with five singularities. We show that the radial and angular equations can be resp... |
0710.1430 | Natalia Kiriushcheva | K. R. Green, N. Kiriushcheva, S. V. Kuzmin | Analysis of Hamiltonian formulations of linearized General Relativity | Section Discussion is modified and references are added; 19 pages | Eur. Phys. J. C71:1678,2011 | 10.1140/epjc/s10052-011-1678-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The different forms of the Hamiltonian formulations of linearized General
Relativity/spin-two theories are discussed in order to show their similarities
and differences. It is demonstrated that in the linear model, non-covariant
modifications to the initial covariant Lagrangian (similar to those
modifications used in... | [
{
"created": "Sun, 7 Oct 2007 16:28:33 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Aug 2008 17:53:21 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Jul 2011 00:20:04 GMT",
"version": "v3"
}
] | 2011-07-18 | [
[
"Green",
"K. R.",
""
],
[
"Kiriushcheva",
"N.",
""
],
[
"Kuzmin",
"S. V.",
""
]
] | The different forms of the Hamiltonian formulations of linearized General Relativity/spin-two theories are discussed in order to show their similarities and differences. It is demonstrated that in the linear model, non-covariant modifications to the initial covariant Lagrangian (similar to those modifications used in f... |
1701.06087 | Anzhong Wang | Anzhong Wang | Ho\v{r}ava Gravity at a Lifshitz Point: A Progress Report | revtex4, three figures. Corrected various typos. Int. J. Mod. Phys.
D26 (2017) 1730014 | Int. J. Mod. Phys. D26 (2017) 1730014 | 10.1142/S0218271817300142 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ho\v{r}ava gravity at a Lifshitz point is a theory intended to quantize
gravity by using techniques of traditional quantum field theories. To avoid
Ostrogradsky's ghosts, a problem that has been plaguing quantization of general
relativity since the middle of 1970's, Ho\v{r}ava chose to break the Lorentz
invariance by... | [
{
"created": "Sat, 21 Jan 2017 21:12:15 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2017 00:27:23 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Apr 2017 00:53:16 GMT",
"version": "v3"
}
] | 2017-04-05 | [
[
"Wang",
"Anzhong",
""
]
] | Ho\v{r}ava gravity at a Lifshitz point is a theory intended to quantize gravity by using techniques of traditional quantum field theories. To avoid Ostrogradsky's ghosts, a problem that has been plaguing quantization of general relativity since the middle of 1970's, Ho\v{r}ava chose to break the Lorentz invariance by a... |
1410.2581 | Ilya Lvovich Shapiro | Ilya L. Shapiro (UFJF), Ana M. Pelinson (UFSC), Filipe de O. Salles
(UFJF) | Gravitational Waves and Perspectives for Quantum Gravity | 21 pages, 4 figures. LaTeX with WS style. Invited Brief Review
published in Modern Physics Letters A | Modern Physics Letters. A29 No. 30 (2014) 1430034-1 | 10.1142/S0217732314300341 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding the role of higher derivatives is probably one of the most
relevant questions in quantum gravity theory. Already at the semiclassical
level, when gravity is a classical background for quantum matter fields, the
action of gravity should include fourth derivative terms to provide
renormalizability in the ... | [
{
"created": "Thu, 9 Oct 2014 19:18:32 GMT",
"version": "v1"
}
] | 2014-10-10 | [
[
"Shapiro",
"Ilya L.",
"",
"UFJF"
],
[
"Pelinson",
"Ana M.",
"",
"UFSC"
],
[
"Salles",
"Filipe de O.",
"",
"UFJF"
]
] | Understanding the role of higher derivatives is probably one of the most relevant questions in quantum gravity theory. Already at the semiclassical level, when gravity is a classical background for quantum matter fields, the action of gravity should include fourth derivative terms to provide renormalizability in the va... |
2201.00599 | Yang Liu | Yang Liu | The effect of quantum correction on Hawking radiation for Schwarzschild
black holes | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate the effect of quantum correction on Hawking radiation for
Schwarzschild black holes. We consider Hawking temperature and entropy to order
G^2 and find that the area law of black holes should be modified. We think of
Hawking radiation as tunneling and find that at certain frequency {\omega} the
radiatio... | [
{
"created": "Mon, 3 Jan 2022 12:02:32 GMT",
"version": "v1"
}
] | 2022-01-04 | [
[
"Liu",
"Yang",
""
]
] | We investigate the effect of quantum correction on Hawking radiation for Schwarzschild black holes. We consider Hawking temperature and entropy to order G^2 and find that the area law of black holes should be modified. We think of Hawking radiation as tunneling and find that at certain frequency {\omega} the radiation ... |
1105.2658 | Jackson Levi Said | Jackson Levi Said, Kristian Zarb Adami | Rotating Charged Cylindrical Black Holes as Particle Accelerators | 6 pages, 2 figures, Phys. Rev. D 83, 104047 (2011) | Phys.Rev.D83:104047,2011 | 10.1103/PhysRevD.83.104047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been pointed out that arbitrary center-of-mass energies may
be obtained for particle collisions near the horizon of an extremal Kerr black
hole. We investigate this mechanism in cylindrical topology. In particular we
consider the center-of-mass energies of a cylindrical black hole with an
extremal rot... | [
{
"created": "Fri, 13 May 2011 08:40:54 GMT",
"version": "v1"
},
{
"created": "Sat, 28 May 2011 13:07:49 GMT",
"version": "v2"
},
{
"created": "Sun, 10 Jul 2011 21:27:01 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Said",
"Jackson Levi",
""
],
[
"Adami",
"Kristian Zarb",
""
]
] | It has recently been pointed out that arbitrary center-of-mass energies may be obtained for particle collisions near the horizon of an extremal Kerr black hole. We investigate this mechanism in cylindrical topology. In particular we consider the center-of-mass energies of a cylindrical black hole with an extremal rotat... |
2007.03211 | Handhika Ramadhan | A S. Habibina and H.S. Ramadhan | Geodesic of nonlinear electrodynamics and stable photon orbits | 30 pages, 19 figures | Phys.Rev. D101 (2020) no.12, 124036 | 10.1103/PhysRevD.101.124036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the geodesics of charged black holes in polynomial Maxwell
Lagrangians, a subclass of models within the nonlinear electrodynamics (NLED).
Specifically, we consider black holes in Kruglov, power-law, and
Ayon-Beato-Garcia models. Our exploration on the corresponding null bound
states reveals that photon can o... | [
{
"created": "Tue, 7 Jul 2020 05:46:41 GMT",
"version": "v1"
}
] | 2020-07-08 | [
[
"Habibina",
"A S.",
""
],
[
"Ramadhan",
"H. S.",
""
]
] | We study the geodesics of charged black holes in polynomial Maxwell Lagrangians, a subclass of models within the nonlinear electrodynamics (NLED). Specifically, we consider black holes in Kruglov, power-law, and Ayon-Beato-Garcia models. Our exploration on the corresponding null bound states reveals that photon can orb... |
gr-qc/9606022 | Jorge Pullin | Carsten Gundlach and Jorge Pullin | Ill-posedness of a double null free evolution scheme for black hole
spacetimes | 5 pages, RevTeX, 1 figure, changes in introduction, title and
conclusions, figure added, to appear in Classical and Quantum Gravity | Class.Quant.Grav. 14 (1997) 991 | 10.1088/0264-9381/14/4/014 | CGPG-96/6-3, LAEFF-96/11 | gr-qc | null | We suggest that ``free evolution'' integration schemes for the Einstein
equations (that do not enforce constraints) may contain exponentially growing
modes that render them useless in numerical integrations of black hole
spacetimes, independently of how the equations are differenced. As an example
we consider the evo... | [
{
"created": "Tue, 11 Jun 1996 15:22:09 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 1997 15:23:17 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Gundlach",
"Carsten",
""
],
[
"Pullin",
"Jorge",
""
]
] | We suggest that ``free evolution'' integration schemes for the Einstein equations (that do not enforce constraints) may contain exponentially growing modes that render them useless in numerical integrations of black hole spacetimes, independently of how the equations are differenced. As an example we consider the evolu... |
1705.01378 | Peter Horvathy | P.-M. Zhang, C. Duval, G. W. Gibbons and P. A. Horvathy | Soft Gravitons & the Memory Effect for Plane Gravitational Waves | 40 pages, many figures. Matches published version | Phys. Rev. D 96, 064013 (2017) | 10.1103/PhysRevD.96.064013 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The "gravitational memory effect" due to an exact plane wave provides us with
an elementary description of the diffeomorphisms associated with soft
gravitons. It is explained how the presence of the latter may be detected by
observing the motion of freely falling particles or other forms of
gravitational wave detecti... | [
{
"created": "Wed, 3 May 2017 12:13:07 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2017 14:52:46 GMT",
"version": "v2"
},
{
"created": "Tue, 30 May 2017 06:06:09 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Sep 2017 16:53:54 GMT",
"version": "v4"
}
] | 2017-10-02 | [
[
"Zhang",
"P. -M.",
""
],
[
"Duval",
"C.",
""
],
[
"Gibbons",
"G. W.",
""
],
[
"Horvathy",
"P. A.",
""
]
] | The "gravitational memory effect" due to an exact plane wave provides us with an elementary description of the diffeomorphisms associated with soft gravitons. It is explained how the presence of the latter may be detected by observing the motion of freely falling particles or other forms of gravitational wave detection... |
0810.1120 | Roberto A. Sussman | Roberto A. Sussman | Quasi-local variables and inhomogeneous cosmological sources with
spherical symmetry | 8 pages, 2 pdf figures. Provides a concise summary of some of the
results of arXiv:0801.3324v4 [gr-qc]. Submitted to the AIP Conference
Proceedings of the III International Meeting on Gravitation and Cosmology,
Morelia, Mexico, May 26-30, 2008 | AIP Conf.Proc.1083:228-235,2008 | 10.1063/1.3058574 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine a large class of inhomogeneous spherically symmetric spacetimes
that generalize the Lemaitre-Tolman-Bondi dust solutions to nonzero pressure
("LTB spacetimes"). Local covariant LTB objects can be expressed as
perturbations of covariant quasi-local (QL) scalars that satisfy evolution
equations of equivalent... | [
{
"created": "Tue, 7 Oct 2008 08:13:23 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Sussman",
"Roberto A.",
""
]
] | We examine a large class of inhomogeneous spherically symmetric spacetimes that generalize the Lemaitre-Tolman-Bondi dust solutions to nonzero pressure ("LTB spacetimes"). Local covariant LTB objects can be expressed as perturbations of covariant quasi-local (QL) scalars that satisfy evolution equations of equivalent F... |
gr-qc/0109033 | Nashed Gamal Gergess Lamee | Gamal G.L. Nashed | Vacuum Non Singular Black Hole Solutions in Tetrad Theory of Gravitation | 11 pages, LaTex, no figures, Submitted to GRG | Gen.Rel.Grav. 34 (2002) 1047-1058 | 10.1023/A:1016509920499 | null | gr-qc | null | Starting from a spherically symmetric tetrad with three unknown functions of
the radial coordinate, a general solution of M{\o}ller's field equations in
case of spherical symmetry nonsingular black hole is derived. The previously
obtained solutions are verified as special cases of the general solution. The
general so... | [
{
"created": "Mon, 10 Sep 2001 21:08:04 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Nashed",
"Gamal G. L.",
""
]
] | Starting from a spherically symmetric tetrad with three unknown functions of the radial coordinate, a general solution of M{\o}ller's field equations in case of spherical symmetry nonsingular black hole is derived. The previously obtained solutions are verified as special cases of the general solution. The general solu... |
2402.11343 | Anele Ncube | Alan S. Cornell, Sheldon R. Herbst, Hajar Noshad, Anele M. Ncube | Solving the Regge-Wheeler and Teukolsky equations: supervised vs.
unsupervised physics-informed neural networks | 22 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Expanding on the research on physics-informed neural networks (PINNs) to
solve the eigenvalue problems in black hole (BH) perturbation theory, the
supervised learning approach was investigated to solve the Regge-Wheeler and
Teukolsky equations governing gravitational perturbations of Schwarzschild and
Kerr BHs. Previ... | [
{
"created": "Sat, 17 Feb 2024 17:35:06 GMT",
"version": "v1"
}
] | 2024-02-20 | [
[
"Cornell",
"Alan S.",
""
],
[
"Herbst",
"Sheldon R.",
""
],
[
"Noshad",
"Hajar",
""
],
[
"Ncube",
"Anele M.",
""
]
] | Expanding on the research on physics-informed neural networks (PINNs) to solve the eigenvalue problems in black hole (BH) perturbation theory, the supervised learning approach was investigated to solve the Regge-Wheeler and Teukolsky equations governing gravitational perturbations of Schwarzschild and Kerr BHs. Previou... |
1612.03259 | Michael Maziashvili | Michael Maziashvili | Light incoherence due to background space fluctuations | 6 pages, accepted for publication in Phys. Rev. D | Phys. Rev. D 94, 124044 (2016) | 10.1103/PhysRevD.94.124044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Working by analogy, we use the description of light fluctuations due to
random collisions of the radiating atoms to figure out why the reduction of the
coherence for light propagating a cosmological distance in the fluctuating
background space is negligibly small to be observed by the stellar
interferometry.
| [
{
"created": "Sat, 10 Dec 2016 06:22:16 GMT",
"version": "v1"
}
] | 2016-12-30 | [
[
"Maziashvili",
"Michael",
""
]
] | Working by analogy, we use the description of light fluctuations due to random collisions of the radiating atoms to figure out why the reduction of the coherence for light propagating a cosmological distance in the fluctuating background space is negligibly small to be observed by the stellar interferometry. |
1105.5830 | J\"org Hennig | Gernot Neugebauer and J\"org Hennig | Stationary two-black-hole configurations: A non-existence proof | 27 pages, 1 figure | J. Geom. Phys. 62, 613 (2012) | 10.1016/j.geomphys.2011.05.008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the solution of a boundary problem for disconnected (Killing)
horizons and the resulting violation of characteristic black hole properties,
we present a non-existence proof for equilibrium configurations consisting of
two aligned rotating black holes. Our discussion is principally aimed at
developing the ide... | [
{
"created": "Sun, 29 May 2011 21:31:43 GMT",
"version": "v1"
}
] | 2012-01-17 | [
[
"Neugebauer",
"Gernot",
""
],
[
"Hennig",
"Jörg",
""
]
] | Based on the solution of a boundary problem for disconnected (Killing) horizons and the resulting violation of characteristic black hole properties, we present a non-existence proof for equilibrium configurations consisting of two aligned rotating black holes. Our discussion is principally aimed at developing the ideas... |
1608.07511 | Klaus Kassner | Klaus Kassner | Why ghosts don't touch: a tale of two adventurers falling one after
another into a black hole | Submitted to European Journal of Physics, 1 figure with 2 panels | European Journal of Physics 38.1 (2016): 015605 | 10.1088/0143-0807/38/1/015605 | null | gr-qc physics.ed-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The case for the utility of Kruskal-Szekeres coordinates in classroom made by
Augousti et al. in this journal (Eur. J. Phys. 33:1--11, 2012) is strengthened
by extending their discussion beyond the event horizon of the black hole.
Observations made by two adventurers following one another into a Schwarzschild
black h... | [
{
"created": "Fri, 26 Aug 2016 16:34:21 GMT",
"version": "v1"
}
] | 2017-03-13 | [
[
"Kassner",
"Klaus",
""
]
] | The case for the utility of Kruskal-Szekeres coordinates in classroom made by Augousti et al. in this journal (Eur. J. Phys. 33:1--11, 2012) is strengthened by extending their discussion beyond the event horizon of the black hole. Observations made by two adventurers following one another into a Schwarzschild black hol... |
1303.1308 | Tatyana P. Shestakova | T. P. Shestakova | Hamiltonian dynamics in extended phase space for gravity and its
consistency with Lagrangian formalism: a generalized spherically symmetric
model as an example | 4 pages, talk presented at the XIII Marcel Grossmann Meeting,
Stockholm, Sweden, July 2012 | Proceedings of the Thirteenth Marcel Grossmann Meeting on General
Relativity (Stockholm, Sweden, 2012), eds. by R. T Jantzen, K. Rosquist and
R. Ruffini, World Scientific, Singapore (2015), P. 1880 - 1882 | 10.1142/9789814623995_0305 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Among theoretical issues in General Relativity the problem of constructing
its Hamiltonian formulation is still of interest. The most of attempts to
quantize Gravity are based upon Dirac generalization of Hamiltonian dynamics
for system with constraints. At the same time there exists another way to
formulate Hamilton... | [
{
"created": "Wed, 6 Mar 2013 12:09:29 GMT",
"version": "v1"
}
] | 2015-04-09 | [
[
"Shestakova",
"T. P.",
""
]
] | Among theoretical issues in General Relativity the problem of constructing its Hamiltonian formulation is still of interest. The most of attempts to quantize Gravity are based upon Dirac generalization of Hamiltonian dynamics for system with constraints. At the same time there exists another way to formulate Hamiltonia... |
2110.02242 | Parampreet Singh | Jorge Pullin, Parampreet Singh | Report on the session Loop Quantum Gravity: Cosmology and Black Holes of
the 16th Marcel Grossmann Meeting | 5 pages | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the main results of 19 talks presented at the QG3 session (loop
quantum gravity: cosmology and black holes) of the 16th Marcel Grossmann
Meeting held online from July $5^{\mathrm{th}}$-10$^{\mathrm{th}}$, 2021.
| [
{
"created": "Tue, 5 Oct 2021 18:00:14 GMT",
"version": "v1"
}
] | 2021-10-07 | [
[
"Pullin",
"Jorge",
""
],
[
"Singh",
"Parampreet",
""
]
] | We summarize the main results of 19 talks presented at the QG3 session (loop quantum gravity: cosmology and black holes) of the 16th Marcel Grossmann Meeting held online from July $5^{\mathrm{th}}$-10$^{\mathrm{th}}$, 2021. |
1909.13272 | Jing-Bo Wang | Jingbo Wang | Hawking Radiation from Boundary Scalar Field | 7 pages;v2, add the discussion about the impact on the information
loss paradox, | Universe 2023, 9, 154 | 10.3390/universe9030154 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking radiation is one essential property of quantum black hole. It results
in the information loss paradox, and give important clue to the unification of
quantum mechanics and general relativity. In the previous works, the boundary
scalar field on the horizon of black holes were used to give the microstates of
BTZ... | [
{
"created": "Sun, 29 Sep 2019 12:51:09 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Dec 2019 08:30:45 GMT",
"version": "v2"
}
] | 2023-03-24 | [
[
"Wang",
"Jingbo",
""
]
] | Hawking radiation is one essential property of quantum black hole. It results in the information loss paradox, and give important clue to the unification of quantum mechanics and general relativity. In the previous works, the boundary scalar field on the horizon of black holes were used to give the microstates of BTZ b... |
0911.5560 | Ryosuke Mizuno | Ryosuke Mizuno, Seiju Ohashi, Tetsuya Shiromizu | Static black hole uniqueness and Penrose inequality | 6 pages | null | 10.1103/PhysRevD.81.044030 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under certain conditions, we give a new way to prove the uniqueness of static
black hole in higher dimensional asymptotically flat spacetimes. In the proof,
the Penrose inequality plays a key role in higher dimensions as well as four
dimensions.
| [
{
"created": "Mon, 30 Nov 2009 07:34:37 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Mizuno",
"Ryosuke",
""
],
[
"Ohashi",
"Seiju",
""
],
[
"Shiromizu",
"Tetsuya",
""
]
] | Under certain conditions, we give a new way to prove the uniqueness of static black hole in higher dimensional asymptotically flat spacetimes. In the proof, the Penrose inequality plays a key role in higher dimensions as well as four dimensions. |
2407.18790 | Rubens R. S. Oliveira | R. R. S. Oliveira | Comment on "Exact massless spinor quasibound states of Schwarzschild
black hole" | 3 pages. Comment on "Exact massless spinor quasibound states of
Schwarzschild black hole'' (DOI: 10.1016/j.physletb.2024.138714) | Phys. Lett. B 856 (2024) 138888 | 10.1016/j.physletb.2024.138888 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this comment, we point out a series of errors made by Senjaya in your
paper (2024) \cite{Senjaya}. In particular, these errors involved the Dirac
equation in the 3+1 dimensional Schwarzschild spacetime, tetrad field, curved
gamma matrices, and the time-independent Dirac equation written in terms of the
inner/scala... | [
{
"created": "Fri, 26 Jul 2024 14:52:40 GMT",
"version": "v1"
}
] | 2024-07-29 | [
[
"Oliveira",
"R. R. S.",
""
]
] | In this comment, we point out a series of errors made by Senjaya in your paper (2024) \cite{Senjaya}. In particular, these errors involved the Dirac equation in the 3+1 dimensional Schwarzschild spacetime, tetrad field, curved gamma matrices, and the time-independent Dirac equation written in terms of the inner/scalar ... |
gr-qc/9412021 | Harald Mueller | Harald F. Muller and Christoph Schmid | Energy Density Fluctuations in Inflationary Cosmology | 20 pages, uses AMSTex, 7 figures (not included) | null | null | ETH-TH/94-25 | gr-qc astro-ph | null | We analyze the energy density fluctuations contributed by scalar fields
$\Phi$ with vanishing expectation values, $\langle\Phi\rangle=0$, which are
present in addition to the inflaton field. For simplicity we take $\Phi$ to be
non--interacting and minimally coupled to gravity. We use normal ordering to
define the ren... | [
{
"created": "Wed, 7 Dec 1994 15:27:22 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Muller",
"Harald F.",
""
],
[
"Schmid",
"Christoph",
""
]
] | We analyze the energy density fluctuations contributed by scalar fields $\Phi$ with vanishing expectation values, $\langle\Phi\rangle=0$, which are present in addition to the inflaton field. For simplicity we take $\Phi$ to be non--interacting and minimally coupled to gravity. We use normal ordering to define the renor... |
1407.1188 | Yusuf Kucukakca | Yusuf Kucukakca | Teleparallel dark energy model with a fermionic field via Noether
symmetry | 7 pages, no figure, the version accepted for publication in The
European Physical Journal C | null | 10.1140/epjc/s10052-014-3086-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we consider a model with a fermionic field that is
non-minimally coupled to gravity in the framework of teleparallel gravity. In
order to determine forms of the coupling and potential function of fermionic
field for the considered model, we use Noether symmetry approach. By applying
this approach... | [
{
"created": "Fri, 4 Jul 2014 10:54:37 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2014 07:23:35 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Kucukakca",
"Yusuf",
""
]
] | In the present work, we consider a model with a fermionic field that is non-minimally coupled to gravity in the framework of teleparallel gravity. In order to determine forms of the coupling and potential function of fermionic field for the considered model, we use Noether symmetry approach. By applying this approach, ... |
2402.14265 | Wen-Di Guo | Wen-Di Guo and Qin Tan | Quasinormal modes of a charged black hole with scalar hair | 10 pages, 4 figures, and 3 tables | Universe 9, 97, 320 (2023) | 10.3390/universe9070320 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From a five-dimensional Einstein-Maxwell theory, Bah et al. constructed a
singularity free topology star/black hole [Phys. Rev. Lett. 126, 151101
(2021)]. After the Klein-Kluza reduction, i.e., integrating the extra space
dimension, it can obtain an effective four-dimensional static spherical charged
black hole with ... | [
{
"created": "Thu, 22 Feb 2024 04:03:38 GMT",
"version": "v1"
}
] | 2024-02-23 | [
[
"Guo",
"Wen-Di",
""
],
[
"Tan",
"Qin",
""
]
] | From a five-dimensional Einstein-Maxwell theory, Bah et al. constructed a singularity free topology star/black hole [Phys. Rev. Lett. 126, 151101 (2021)]. After the Klein-Kluza reduction, i.e., integrating the extra space dimension, it can obtain an effective four-dimensional static spherical charged black hole with sc... |
gr-qc/9512036 | Bernd Bruegmann | Bernd Bruegmann | On the constraint algebra of quantum gravity in the loop representation | 17 pages, LaTeX, 2 figures included with epsf | Nucl.Phys.B474:249-268,1996 | 10.1016/0550-3213(96)00241-6 | null | gr-qc | null | Although an important issue in canonical quantization, the problem of
representing the constraint algebra in the loop representation of quantum
gravity has received little attention. The only explicit computation was
performed by Gambini, Garat and Pullin for a formal point-splitting
regularization of the diffeomorph... | [
{
"created": "Wed, 20 Dec 1995 16:15:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bruegmann",
"Bernd",
""
]
] | Although an important issue in canonical quantization, the problem of representing the constraint algebra in the loop representation of quantum gravity has received little attention. The only explicit computation was performed by Gambini, Garat and Pullin for a formal point-splitting regularization of the diffeomorphis... |
0707.1202 | Emanuele Berti | Emanuele Berti, Jaime Cardoso, Vitor Cardoso, Marco Cavaglia | Matched-filtering and parameter estimation of ringdown waveforms | 19 pages, 9 figures, matches version in press in PRD | Phys.Rev.D76:104044,2007 | 10.1103/PhysRevD.76.104044 | null | gr-qc astro-ph | null | Using recent results from numerical relativity simulations of non-spinning
binary black hole mergers we revisit the problem of detecting ringdown
waveforms and of estimating the source parameters, considering both LISA and
Earth-based interferometers. We find that Advanced LIGO and EGO could detect
intermediate-mass ... | [
{
"created": "Mon, 9 Jul 2007 09:10:13 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Nov 2007 03:25:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Jaime",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Cavaglia",
"Marco",
""
]
] | Using recent results from numerical relativity simulations of non-spinning binary black hole mergers we revisit the problem of detecting ringdown waveforms and of estimating the source parameters, considering both LISA and Earth-based interferometers. We find that Advanced LIGO and EGO could detect intermediate-mass bl... |
2108.04146 | Mengjie Wang | Yunhe Lei, Mengjie Wang, Jiliang Jing | Maxwell perturbations in a cavity with Robin boundary conditions: two
branches of modes with spectrum bifurcation on Schwarzschild black holes | 11 pages, 5 figures, published in EPJC | null | 10.1140/epjc/s10052-021-09942-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a systematic study of the Maxwell quasinormal spectrum in a
mirror-like cavity following the generic Robin type vanishing energy flux
principle, by starting with the Schwarzschild black holes in this paper. It is
shown that, for black holes in a cavity, the vanishing energy flux principle
leads to \textit{... | [
{
"created": "Mon, 9 Aug 2021 16:15:09 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Dec 2021 09:50:29 GMT",
"version": "v2"
}
] | 2021-12-28 | [
[
"Lei",
"Yunhe",
""
],
[
"Wang",
"Mengjie",
""
],
[
"Jing",
"Jiliang",
""
]
] | We perform a systematic study of the Maxwell quasinormal spectrum in a mirror-like cavity following the generic Robin type vanishing energy flux principle, by starting with the Schwarzschild black holes in this paper. It is shown that, for black holes in a cavity, the vanishing energy flux principle leads to \textit{tw... |
2307.13041 | Marcelo E. Rubio | Marcelo E. Rubio, \'Aron D. Kov\'acs, M. Herrero-Valea, Miguel
Bezares, Enrico Barausse | Well-posed evolution of field theories with anisotropic scaling: the
Lifshitz scalar field in a black hole space-time | 28 pages, 11 figures, 1 table. Accepted for publication in JCAP | JCAP11(2023)001 | 10.1088/1475-7516/2023/11/001 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Partial differential equations exhibiting an anisotropic scaling between
space and time -- such as those of Horava-Lifshitz gravity -- have a dispersive
nature. They contain higher-order spatial derivatives, but remain second order
in time. This is inconvenient for performing long-time numerical evolutions, as
standa... | [
{
"created": "Mon, 24 Jul 2023 18:00:08 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2023 09:26:50 GMT",
"version": "v2"
}
] | 2023-11-23 | [
[
"Rubio",
"Marcelo E.",
""
],
[
"Kovács",
"Áron D.",
""
],
[
"Herrero-Valea",
"M.",
""
],
[
"Bezares",
"Miguel",
""
],
[
"Barausse",
"Enrico",
""
]
] | Partial differential equations exhibiting an anisotropic scaling between space and time -- such as those of Horava-Lifshitz gravity -- have a dispersive nature. They contain higher-order spatial derivatives, but remain second order in time. This is inconvenient for performing long-time numerical evolutions, as standard... |
0911.0593 | Sandipan Sengupta | Sandipan Sengupta | Quantum realizations of Hilbert-Palatini second-class constraints | Published version | Class.Quant.Grav.27:145008,2010 | 10.1088/0264-9381/27/14/145008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a classical theory of gravity, the Barbero-Immirzi parameter ($\eta$)
appears as a topological coupling constant through the Lagrangian density
containing the Hilbert-Palatini term and the Nieh-Yan invariant. In a quantum
framework, the topological interpretation of $\eta$ can be captured through a
rescaling of th... | [
{
"created": "Tue, 3 Nov 2009 15:35:26 GMT",
"version": "v1"
},
{
"created": "Sat, 29 May 2010 03:27:24 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Sengupta",
"Sandipan",
""
]
] | In a classical theory of gravity, the Barbero-Immirzi parameter ($\eta$) appears as a topological coupling constant through the Lagrangian density containing the Hilbert-Palatini term and the Nieh-Yan invariant. In a quantum framework, the topological interpretation of $\eta$ can be captured through a rescaling of the ... |
2009.02928 | Naoki Seto | Naoki Seto | Measuring Parity Asymmetry of Gravitational Wave Backgrounds with a
Heliocentric Detector Network in the mHz Band | 6 pages, 4 figures, to appear in PRL | Phys. Rev. Lett. 125, 251101 (2020) | 10.1103/PhysRevLett.125.251101 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss exploration for isotropic gravitational wave backgrounds around 1
mHz by correlation analysis, targeting both parity odd and even polarization
modes. Even though the space interferometer LISA alone cannot probe the two
modes due to cancellations, the outlook is being changed drastically by the
strong devel... | [
{
"created": "Mon, 7 Sep 2020 08:00:14 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Nov 2020 03:35:46 GMT",
"version": "v2"
}
] | 2021-01-04 | [
[
"Seto",
"Naoki",
""
]
] | We discuss exploration for isotropic gravitational wave backgrounds around 1 mHz by correlation analysis, targeting both parity odd and even polarization modes. Even though the space interferometer LISA alone cannot probe the two modes due to cancellations, the outlook is being changed drastically by the strong develop... |
1803.10947 | Song Ming Du | Song Ming Du and Yanbei Chen | Searching for near-horizon quantum structures in the binary black-hole
stochastic gravitational-wave background | 5 pages, 5 figures | Phys. Rev. Lett. 121, 051105 (2018) | 10.1103/PhysRevLett.121.051105 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been speculated that quantum gravity corrections may lead to
modifications to space-time geometry near black hole horizons. Such structures
may cause reflections to gravitational waves, causing {\it echoes} that follow
the main gravitational waves from binary black hole coalescence. We show that
such echoes, i... | [
{
"created": "Thu, 29 Mar 2018 07:49:25 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Aug 2018 21:18:14 GMT",
"version": "v2"
}
] | 2018-08-07 | [
[
"Du",
"Song Ming",
""
],
[
"Chen",
"Yanbei",
""
]
] | It has been speculated that quantum gravity corrections may lead to modifications to space-time geometry near black hole horizons. Such structures may cause reflections to gravitational waves, causing {\it echoes} that follow the main gravitational waves from binary black hole coalescence. We show that such echoes, if ... |
1901.09808 | B. S. Ratanpal | B. S. Ratanpal | Cracking and Stability of Non-Rotating Relativistic Spheres with
Anisotropic Internal Stresses | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stability of static uncharged spheres with anisotropic internal stresses
is studied in general relativity. It has been noticed that pressure anisotropy
plays an important role for stability of stellar structure. It is shown that
radial profile of the stress anisotropy can be considered to decide potentially
stabl... | [
{
"created": "Wed, 23 Jan 2019 05:50:10 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jun 2020 08:42:47 GMT",
"version": "v2"
}
] | 2020-06-29 | [
[
"Ratanpal",
"B. S.",
""
]
] | The stability of static uncharged spheres with anisotropic internal stresses is studied in general relativity. It has been noticed that pressure anisotropy plays an important role for stability of stellar structure. It is shown that radial profile of the stress anisotropy can be considered to decide potentially stable/... |
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