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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2008.04501 | Michael K. -H. Kiessling | Parker Hund and Michael K.-H. Kiessling | How much electric surcharge fits on ... a white dwarf star? | 9 pages, 3 figures. This revision contains about 1/3 of v1, slightly
expanded, and will appear in Am. J. Phys. It no longer contains the exactly
solvable model. The remaining 2/3 of v1 with the exactly solvable model have
been expanded significantly into a new paper in its own right, to be
published separately | null | 10.1119/10.0002436 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The question how much surplus of electric charge ("surcharge") fits on an
object is generally very difficult to answer. Here it is shown that it is easy
to answer when the object is a \emph{failed white dwarf} star (a brown dwarf in
its ground state) made of protons and electrons: Given the number of protons,
how man... | [
{
"created": "Tue, 11 Aug 2020 03:42:16 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 2020 23:14:01 GMT",
"version": "v2"
}
] | 2021-03-17 | [
[
"Hund",
"Parker",
""
],
[
"Kiessling",
"Michael K. -H.",
""
]
] | The question how much surplus of electric charge ("surcharge") fits on an object is generally very difficult to answer. Here it is shown that it is easy to answer when the object is a \emph{failed white dwarf} star (a brown dwarf in its ground state) made of protons and electrons: Given the number of protons, how many ... |
2012.08470 | Konstantin Osetrin | Konstantin Osetrin, Altair Filippov and Evgeny Osetrin | Exact models of pure radiation in R^2 gravity for spatially homogeneous
Shapovalov spacetimes type II | 11 pages | Journal of Mathematical Physics, 2021, 62(9),092501 | 10.1063/5.0054684 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | Presented are exactly integrable models with pure radiation in R^2 gravity
with a cosmological constant, related to wave-like Shapovalov spacetimes type
II. Spatially homogeneous models of Shapovalov spaces were considered. The
obtained solutions belong to spaces of type III according to the Bianchi
classification. F... | [
{
"created": "Tue, 15 Dec 2020 18:11:47 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jan 2021 12:50:28 GMT",
"version": "v2"
}
] | 2022-03-10 | [
[
"Osetrin",
"Konstantin",
""
],
[
"Filippov",
"Altair",
""
],
[
"Osetrin",
"Evgeny",
""
]
] | Presented are exactly integrable models with pure radiation in R^2 gravity with a cosmological constant, related to wave-like Shapovalov spacetimes type II. Spatially homogeneous models of Shapovalov spaces were considered. The obtained solutions belong to spaces of type III according to the Bianchi classification. For... |
1709.01163 | Ravi Mistry | Ravi Mistry, Sudhaker Upadhyay, Ahmed Farag Ali and Mir Faizal | Hawking Radiation Power Equations for Black Holes | 19 pages, 8 figures, Accepted in Nucl. Phys. B, amended | Nucl.Phys. B923 (2017) 378-393 | 10.1016/j.nuclphysb.2017.08.010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the Hawking radiation power equations for black holes in
asymptotically flat, asymptotically Anti-de Sitter (AdS) and asymptotically de
Sitter (dS) black holes, This is done by using the greybody factor for these
black holes. We observe that the radiation power equation for asymptotically
flat black holes, ... | [
{
"created": "Thu, 31 Aug 2017 22:46:11 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2017 06:47:59 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Nov 2017 18:35:09 GMT",
"version": "v3"
}
] | 2017-11-03 | [
[
"Mistry",
"Ravi",
""
],
[
"Upadhyay",
"Sudhaker",
""
],
[
"Ali",
"Ahmed Farag",
""
],
[
"Faizal",
"Mir",
""
]
] | We derive the Hawking radiation power equations for black holes in asymptotically flat, asymptotically Anti-de Sitter (AdS) and asymptotically de Sitter (dS) black holes, This is done by using the greybody factor for these black holes. We observe that the radiation power equation for asymptotically flat black holes, co... |
gr-qc/0109027 | Kirill Bronnikov | K.A. Bronnikov and G.N. Shikin (PFUR, Moscow) | Spherically symmetric scalar vacuum: no-go theorems, black holes and
solitons | Latex2e, 10 pages, 3 figures, to be published in Grav. & Cosmol | Grav.Cosmol.8:107-116,2002 | null | null | gr-qc | null | We prove some theorems characterizing the global properties of static,
spherically symmetric configurations of a self-gravitating real scalar field in
general relativity (GR) in various dimensions, with an arbitrary potential $V$,
not necessarily positive-definite. The results are extended to sigma models,
scalar-ten... | [
{
"created": "Fri, 7 Sep 2001 13:06:13 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Bronnikov",
"K. A.",
"",
"PFUR, Moscow"
],
[
"Shikin",
"G. N.",
"",
"PFUR, Moscow"
]
] | We prove some theorems characterizing the global properties of static, spherically symmetric configurations of a self-gravitating real scalar field in general relativity (GR) in various dimensions, with an arbitrary potential $V$, not necessarily positive-definite. The results are extended to sigma models, scalar-tenso... |
2103.17063 | Nicola Bamonti | Nicola Bamonti, Andrea Costantini, Giovanni Montani | Features of the Primordial Universe in f(R)-gravity as viewed in the
Jordan frame | 20 pages, 8 figures | null | 10.1088/1361-6382/ac7694 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze some relevant features of the primordial Universe as viewed in the
Jordan frame formulation of the f(R)-gravity, especially when the potential
term of the non-minimally coupled scalar field is negligible. We start
formulating the Hamiltonian picture in the Jordan frame, using the 3-metric
determinant as a ... | [
{
"created": "Wed, 31 Mar 2021 13:30:55 GMT",
"version": "v1"
}
] | 2023-04-13 | [
[
"Bamonti",
"Nicola",
""
],
[
"Costantini",
"Andrea",
""
],
[
"Montani",
"Giovanni",
""
]
] | We analyze some relevant features of the primordial Universe as viewed in the Jordan frame formulation of the f(R)-gravity, especially when the potential term of the non-minimally coupled scalar field is negligible. We start formulating the Hamiltonian picture in the Jordan frame, using the 3-metric determinant as a ba... |
gr-qc/9607046 | Prasanna | A. R. Prasanna (Physical Research Laboratory, Ahmedabad, India) | Inertial frame dragging and Mach's principle in General Relativity | 19 pages, LateX | Class.Quant.Grav. 14 (1997) 227-236 | 10.1088/0264-9381/14/1/020 | null | gr-qc | null | We define a new parameter `cumulative drag index' for a particle in circular
orbit in a stationary, axisymmetric gravitational field and study its behaviour
in the two well known solutions of general relativity {\it viz.}, the Kerr
spacetime and the G\"odel spacetime, wherein the inertial frame dragging has an
import... | [
{
"created": "Mon, 22 Jul 1996 07:42:42 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Prasanna",
"A. R.",
"",
"Physical Research Laboratory, Ahmedabad, India"
]
] | We define a new parameter `cumulative drag index' for a particle in circular orbit in a stationary, axisymmetric gravitational field and study its behaviour in the two well known solutions of general relativity {\it viz.}, the Kerr spacetime and the G\"odel spacetime, wherein the inertial frame dragging has an importan... |
2402.17626 | Georg Junker | Won Sang Chung, Georg Junker and Hassan Hassanabadi | An algebraic approach to gravitational quantum mechanics | 20 pages, 2 figures | null | null | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most approaches towards a quantum theory of gravitation indicate the
existence of a minimal length scale of the order of the Planck length. Quantum
mechanical models incorporating such an intrinsic length scale call for a
deformation of Heisenberg's algebra resulting in a generalized uncertainty
principle and constit... | [
{
"created": "Tue, 27 Feb 2024 15:54:18 GMT",
"version": "v1"
}
] | 2024-02-28 | [
[
"Chung",
"Won Sang",
""
],
[
"Junker",
"Georg",
""
],
[
"Hassanabadi",
"Hassan",
""
]
] | Most approaches towards a quantum theory of gravitation indicate the existence of a minimal length scale of the order of the Planck length. Quantum mechanical models incorporating such an intrinsic length scale call for a deformation of Heisenberg's algebra resulting in a generalized uncertainty principle and constitut... |
2312.02822 | Bayram Tekin | Emel Altas, Bayram Tekin | Non-stationary Energy of Perfect Fluid Sources in General Relativity | 15 pages, 1 figure, matches the published version | Phys.Rev.D 109 (2024) 4, 044001 | 10.1103/PhysRevD.109.044001 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ADM energy for asymptotically flat spacetimes or its generalizations to
asymptotically non-flat spacetimes measure the energy content of a stationary
spacetime, such as a single black hole. Such a stationary energy is given as a
geometric invariant of the spatial hypersurface of the spacetime and is
expressed as ... | [
{
"created": "Tue, 5 Dec 2023 15:07:08 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2024 06:39:40 GMT",
"version": "v2"
}
] | 2024-02-06 | [
[
"Altas",
"Emel",
""
],
[
"Tekin",
"Bayram",
""
]
] | The ADM energy for asymptotically flat spacetimes or its generalizations to asymptotically non-flat spacetimes measure the energy content of a stationary spacetime, such as a single black hole. Such a stationary energy is given as a geometric invariant of the spatial hypersurface of the spacetime and is expressed as an... |
gr-qc/9812039 | Leonardo Fernandez-Jambrina | L. Fernandez-Jambrina, L. M. Gonzalez-Romero | Exterior Differential System for Cosmological G2 Perfect Fluids and
Geodesic Completeness | 27 pages, 0 figures, LaTeX2e, to be published in Classical and
Quantum Gravity | Class.Quant.Grav. 16 (1999) 953-972 | 10.1088/0264-9381/16/3/023 | null | gr-qc | null | In this paper a new formalism based on exterior differential systems is
derived for perfect-fluid spacetimes endowed with an abelian orthogonally
transitive G2 group of motions acting on spacelike surfaces. This formulation
allows simplifications of Einstein equations and it can be applied for
different purposes. As ... | [
{
"created": "Fri, 11 Dec 1998 16:45:12 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fernandez-Jambrina",
"L.",
""
],
[
"Gonzalez-Romero",
"L. M.",
""
]
] | In this paper a new formalism based on exterior differential systems is derived for perfect-fluid spacetimes endowed with an abelian orthogonally transitive G2 group of motions acting on spacelike surfaces. This formulation allows simplifications of Einstein equations and it can be applied for different purposes. As an... |
1502.06912 | Maxim Eingorn | Maxim Eingorn and Claus Kiefer | Scalar perturbations in cosmological models with dark energy - dark
matter interaction | 10 pages, no figures | JCAP 07 (2015) 036 | 10.1088/1475-7516/2015/07/036 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar cosmological perturbations are investigated in the framework of a
model with interacting dark energy and dark matter. In addition to these
constituents, the inhomogeneous Universe is supposed to be filled with the
standard noninteracting constituents corresponding to the conventional
$\Lambda$CDM model. The in... | [
{
"created": "Sat, 21 Feb 2015 14:57:59 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2015 19:17:29 GMT",
"version": "v2"
}
] | 2015-07-24 | [
[
"Eingorn",
"Maxim",
""
],
[
"Kiefer",
"Claus",
""
]
] | Scalar cosmological perturbations are investigated in the framework of a model with interacting dark energy and dark matter. In addition to these constituents, the inhomogeneous Universe is supposed to be filled with the standard noninteracting constituents corresponding to the conventional $\Lambda$CDM model. The inte... |
2301.08354 | Adam Peterson | Adam J Peterson, Don Willcox, and Phillip Moesta | Code generation for AMReX with applications to numerical relativity | 26 pages, 15 figures | null | null | null | gr-qc physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new python/SymPy based code generator for producing executable
numerical expressions for partial differential equations in AMReX-based
applications. We demonstrate the code generator capabilities for the case of
$3+1$ ADM formulations of numerical relativity for the constraint damped,
conformal Z4 formul... | [
{
"created": "Thu, 19 Jan 2023 23:18:36 GMT",
"version": "v1"
}
] | 2023-01-23 | [
[
"Peterson",
"Adam J",
""
],
[
"Willcox",
"Don",
""
],
[
"Moesta",
"Phillip",
""
]
] | We present a new python/SymPy based code generator for producing executable numerical expressions for partial differential equations in AMReX-based applications. We demonstrate the code generator capabilities for the case of $3+1$ ADM formulations of numerical relativity for the constraint damped, conformal Z4 formulat... |
0812.3171 | Carlos Alex Souza da Silva M.Sc | C.A.S. Silva | Fuzzy spaces topology change as a possible solution to the black hole
information loss paradox | 7 pages | Phys.Lett.B677:318-321,2009 | 10.1016/j.physletb.2009.05.031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we argue that modelling the black hole event horizon as a fuzzy
sphere we can get a possible solution to the black hole information loss
paradox.
| [
{
"created": "Tue, 16 Dec 2008 22:40:10 GMT",
"version": "v1"
}
] | 2009-12-04 | [
[
"Silva",
"C. A. S.",
""
]
] | In this paper we argue that modelling the black hole event horizon as a fuzzy sphere we can get a possible solution to the black hole information loss paradox. |
gr-qc/0312103 | Martin Bojowald | Martin Bojowald and Kevin Vandersloot | Loop Quantum Cosmology and Boundary Proposals | 18 pages, 5 figures, invited parallel talk at Xth Marcel Grossmann
meeting, July 20-26, 2003, Rio de Janeiro | null | null | AEI-2003-114 | gr-qc | null | For many years, the most active area of quantum cosmology has been the issue
of choosing boundary conditions for the wave function of a universe. Recently,
loop quantum cosmology, which is obtained from loop quantum gravity, has shed
new light on this question. In this case, boundary conditions are not chosen by
hand... | [
{
"created": "Tue, 23 Dec 2003 13:58:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bojowald",
"Martin",
""
],
[
"Vandersloot",
"Kevin",
""
]
] | For many years, the most active area of quantum cosmology has been the issue of choosing boundary conditions for the wave function of a universe. Recently, loop quantum cosmology, which is obtained from loop quantum gravity, has shed new light on this question. In this case, boundary conditions are not chosen by hand w... |
1609.01824 | Abhik Kumar Sanyal Dr. | Nayem Sk., Abhik Kumar Sanyal | Why scalar-tensor equivalent theories are not physically equivalent? | 14 pages, To appear in IJMPD (2017) | IJMPD, Vol. 26 (2017) 1750162 (18 pages) | 10.1142/S0218271817501620 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Whether Jordan's and Einstein's frame descriptions of F(R) theory of gravity
are physically equivalent, is a long standing debate. However, practically none
questioned on true mathematical equivalence, since classical field equations
may be translated from one frame to the other following a transformation
relation. H... | [
{
"created": "Wed, 7 Sep 2016 03:54:36 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2016 14:12:36 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Aug 2017 16:28:43 GMT",
"version": "v3"
}
] | 2017-08-02 | [
[
"Sk.",
"Nayem",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | Whether Jordan's and Einstein's frame descriptions of F(R) theory of gravity are physically equivalent, is a long standing debate. However, practically none questioned on true mathematical equivalence, since classical field equations may be translated from one frame to the other following a transformation relation. Her... |
1706.07301 | SangChul Yoon | SangChul Yoon | Lagrangian and Hamiltonian formulations of the Palatini action | This paper is not understood as the author intended. I do not think
it should be here anymore | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the Ashtekar-Barbero variables in Loop Quantum Gravity(LQG)
starting from the Palatini action. We find that we need either the torsion-free
condition or the compatibility condition for the Palatini action to describe
General Relativity.
| [
{
"created": "Wed, 21 Jun 2017 14:26:06 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Aug 2017 07:19:13 GMT",
"version": "v2"
}
] | 2017-08-11 | [
[
"Yoon",
"SangChul",
""
]
] | We derive the Ashtekar-Barbero variables in Loop Quantum Gravity(LQG) starting from the Palatini action. We find that we need either the torsion-free condition or the compatibility condition for the Palatini action to describe General Relativity. |
2102.11735 | Leonardo Giani | Leonardo Giani, Emmanuel Frion, Oliver Fabio Piattella | Impact of inhomogeneities on slowly rolling Quintessence: implications
for the local variations of the fine-structure constant | v2, with minor changes to match the published version. 2 tables and 1
figure added, with a discussion of current observations | null | 10.1088/1361-6382/ac1870 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how the evolution of a Dark Energy Quintessence fluid is modified by
the presence of a matter inhomogeneity. To do so, we study linear perturbations
of a flat FLRW background containing dust and a slowly rolling scalar field.
Under the assumptions of spherical symmetry and a static density contrast,
\textit{... | [
{
"created": "Tue, 23 Feb 2021 14:58:57 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jul 2021 09:01:50 GMT",
"version": "v2"
}
] | 2021-07-30 | [
[
"Giani",
"Leonardo",
""
],
[
"Frion",
"Emmanuel",
""
],
[
"Piattella",
"Oliver Fabio",
""
]
] | We study how the evolution of a Dark Energy Quintessence fluid is modified by the presence of a matter inhomogeneity. To do so, we study linear perturbations of a flat FLRW background containing dust and a slowly rolling scalar field. Under the assumptions of spherical symmetry and a static density contrast, \textit{i.... |
gr-qc/9904058 | Owen Dando | Owen Dando | Textures in Dilaton Gravity | 22 pages, 7 figures, RevTeX, a number of content changes in response
to referee's comments | null | null | DTP/99/29 | gr-qc | null | We examine the field equations of a self-gravitating texture in low-energy
superstring gravity, allowing for an arbitrary coupling of the texture field to
the dilaton. Both massive and massless dilatons are considered. For the
massless dilaton non-singular spacetimes exist, but only for certain values of
the coupling... | [
{
"created": "Fri, 23 Apr 1999 11:53:56 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 1999 11:12:04 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Dando",
"Owen",
""
]
] | We examine the field equations of a self-gravitating texture in low-energy superstring gravity, allowing for an arbitrary coupling of the texture field to the dilaton. Both massive and massless dilatons are considered. For the massless dilaton non-singular spacetimes exist, but only for certain values of the coupling, ... |
2201.00697 | LSC P&P Committee | The LIGO Scientific Collaboration, the Virgo Collaboration, and the
KAGRA Collaboration: R. Abbott, H. Abe, F. Acernese, K. Ackley, N. Adhikari,
R. X. Adhikari, V. K. Adkins, V. B. Adya, C. Affeldt, D. Agarwal, M. Agathos,
K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, T.
Akutsu, S. Albane... | All-sky search for continuous gravitational waves from isolated neutron
stars using Advanced LIGO and Advanced Virgo O3 data | 23 main text pages, 17 figures | null | 10.1103/PhysRevD.106.102008 | LIGO-P2100367 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results of an all-sky search for continuous gravitational waves
which can be produced by spinning neutron stars with an asymmetry around their
rotation axis, using data from the third observing run of the Advanced LIGO and
Advanced Virgo detectors. Four different analysis methods are used to search in
a gr... | [
{
"created": "Mon, 3 Jan 2022 15:03:41 GMT",
"version": "v1"
}
] | 2022-12-14 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"the KAGRA Collaboration",
"",
""
],
[
"Abbott",
"R.",
""
],
[
"Abe",
"H.",
""
],
[
"Acernese",
"F.",
""
],
[
"Ackley",
"K... | We present results of an all-sky search for continuous gravitational waves which can be produced by spinning neutron stars with an asymmetry around their rotation axis, using data from the third observing run of the Advanced LIGO and Advanced Virgo detectors. Four different analysis methods are used to search in a grav... |
2110.13723 | Tapobrata Sarkar | Kunal Pal, Kuntal Pal, Rajibul Shaikh, Tapobrata Sarkar | Shadows in conformally related gravity theories | 12 Pages, 3 Figures | null | 10.1016/j.physletb.2022.137109 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Null geodesics are invariant under a conformal transformation, and thus it
might seem natural to assume that the observables corresponding to the shadow
of a space-time are also conformally invariant. Here, we argue instead, that
since the Arnowitt-Deser-Misner mass and the active gravitational mass of an
asymptotica... | [
{
"created": "Tue, 26 Oct 2021 14:17:12 GMT",
"version": "v1"
}
] | 2022-04-20 | [
[
"Pal",
"Kunal",
""
],
[
"Pal",
"Kuntal",
""
],
[
"Shaikh",
"Rajibul",
""
],
[
"Sarkar",
"Tapobrata",
""
]
] | Null geodesics are invariant under a conformal transformation, and thus it might seem natural to assume that the observables corresponding to the shadow of a space-time are also conformally invariant. Here, we argue instead, that since the Arnowitt-Deser-Misner mass and the active gravitational mass of an asymptoticall... |
2105.12057 | Suvankar Paul | Rajibul Shaikh, Suvankar Paul, Pritam Banerjee, Tapobrata Sarkar | Shadows and thin accretion disk images of the $\gamma$-metric | 14 pages, 22 figures | null | 10.1140/epjc/s10052-022-10664-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\gamma$-metric is a static, axially-symmetric singular solution of the
vacuum Einstein's equations without an event horizon. This is a two-parameter
family of solutions, generic values of one of which (called $\gamma$) measure
the deviation from spherical symmetry. Here, we first study the shadow cast by
this ge... | [
{
"created": "Tue, 25 May 2021 16:38:04 GMT",
"version": "v1"
}
] | 2022-08-24 | [
[
"Shaikh",
"Rajibul",
""
],
[
"Paul",
"Suvankar",
""
],
[
"Banerjee",
"Pritam",
""
],
[
"Sarkar",
"Tapobrata",
""
]
] | The $\gamma$-metric is a static, axially-symmetric singular solution of the vacuum Einstein's equations without an event horizon. This is a two-parameter family of solutions, generic values of one of which (called $\gamma$) measure the deviation from spherical symmetry. Here, we first study the shadow cast by this geom... |
2008.04360 | Teng Zhang | Teng Zhang, Philip Jones, Ji\v{r}\'i Smetana, Haixing Miao, Denis
Martynov, Andreas Freise, and Stefan W. Ballmer | A two-carrier scheme: evading the 3dB quantum penalty of heterodyne
readout in gravitational-wave detectors | null | Phys. Rev. Lett. 126, 221301 (2021) | 10.1103/PhysRevLett.126.221301 | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precision measurements using traditional heterodyne readout suffer a 3dB
quantum noise penalty compared with homodyne readout. The extra noise is caused
by the quantum fluctuations in the image vacuum. We propose a two-carrier
gravitational-wave detector design that evades the 3dB quantum penalty of
heterodyne readou... | [
{
"created": "Mon, 10 Aug 2020 18:47:33 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Oct 2020 20:55:36 GMT",
"version": "v2"
},
{
"created": "Sat, 15 May 2021 13:41:10 GMT",
"version": "v3"
}
] | 2021-06-09 | [
[
"Zhang",
"Teng",
""
],
[
"Jones",
"Philip",
""
],
[
"Smetana",
"Jiří",
""
],
[
"Miao",
"Haixing",
""
],
[
"Martynov",
"Denis",
""
],
[
"Freise",
"Andreas",
""
],
[
"Ballmer",
"Stefan W.",
""
]
] | Precision measurements using traditional heterodyne readout suffer a 3dB quantum noise penalty compared with homodyne readout. The extra noise is caused by the quantum fluctuations in the image vacuum. We propose a two-carrier gravitational-wave detector design that evades the 3dB quantum penalty of heterodyne readout.... |
gr-qc/0012049 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Quantum theory's last challenge | (9 pages, LaTex) This is the preprint version of an article that
appeared in the issue 6813 (volume 408) of Nature, as part of a 3-article
celebration of the 100th anniversary of Planck's solution of the
black-body-radiation problem | Nature 408 (2000) 661-664 | 10.1038/35047210 | null | gr-qc astro-ph hep-ph hep-th | null | Quantum mechanics is now 100 years old and still going strong. Combining
general relativity with quantum mechanics is the last hurdle to be overcome in
the "quantum revolution".
| [
{
"created": "Thu, 14 Dec 2000 21:04:21 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | Quantum mechanics is now 100 years old and still going strong. Combining general relativity with quantum mechanics is the last hurdle to be overcome in the "quantum revolution". |
gr-qc/9611016 | Giovanni Amelino-Camelia | G. Amelino-Camelia | Enlarged Bound on the Measurability of Distances and Quantum
$\kappa$-Poincar\`e Group | 5 pages, LaTex | Phys.Lett. B392 (1997) 283-286 | 10.1016/S0370-2693(96)01565-1 | OUTP-96-54P | gr-qc | null | When quantum mechanical and general relativistic effects are taken into
account in the analysis of distance measurements, one finds a measurability
bound. I observe that some of the structures that have been encountered in the
literature on the Quantum $\kappa$-Poincar\`e Group naturally lead to this
bound.
| [
{
"created": "Wed, 6 Nov 1996 19:09:34 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Amelino-Camelia",
"G.",
""
]
] | When quantum mechanical and general relativistic effects are taken into account in the analysis of distance measurements, one finds a measurability bound. I observe that some of the structures that have been encountered in the literature on the Quantum $\kappa$-Poincar\`e Group naturally lead to this bound. |
1905.03552 | Titus K Mathew | Hassan Basari V.T., Krishna P. B., Priyesh K. V. and Titus K. Mathew | Emergence of space and expansion of universe | 16 pages, 2 figures | Class. Quant. Grav., 39, 115012 (2022) | 10.1088/1361-6382/ac6a39 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to the principle of emergence, the expansion of the universe can be
explained as the emergence of space with the progress of cosmic time. We have
analytically solved the equation of emergence proposed by Padmanabhan by
assuming the Komar energy density $\rho+3P$ as a function of the Hubble
parameter. The re... | [
{
"created": "Thu, 9 May 2019 11:48:33 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2020 10:54:18 GMT",
"version": "v2"
},
{
"created": "Tue, 18 May 2021 15:48:34 GMT",
"version": "v3"
},
{
"created": "Mon, 16 Aug 2021 09:59:54 GMT",
"version": "v4"
},
{
"cr... | 2022-07-26 | [
[
"T.",
"Hassan Basari V.",
""
],
[
"B.",
"Krishna P.",
""
],
[
"V.",
"Priyesh K.",
""
],
[
"Mathew",
"Titus K.",
""
]
] | According to the principle of emergence, the expansion of the universe can be explained as the emergence of space with the progress of cosmic time. We have analytically solved the equation of emergence proposed by Padmanabhan by assuming the Komar energy density $\rho+3P$ as a function of the Hubble parameter. The resu... |
1310.3587 | Ran Li | Ran Li | Stability of charged black holes in string theory under charged massive
scalar perturbations | 12 pages, 3 figures | Phys. Rev. D 88, 127901 (2013) | 10.1103/PhysRevD.88.127901 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Similar to the superradiant effect in Reissner-Nordstr\"{o}m black hole, a
charged scalar field can be amplified when impinging on the charged black hole
in string theory. According to the black-hole bomb mechanism,the mass term of
the incident field can works as the reflecting mirror, which may trigger the
instabili... | [
{
"created": "Mon, 14 Oct 2013 07:55:21 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 2013 02:26:44 GMT",
"version": "v2"
}
] | 2013-12-05 | [
[
"Li",
"Ran",
""
]
] | Similar to the superradiant effect in Reissner-Nordstr\"{o}m black hole, a charged scalar field can be amplified when impinging on the charged black hole in string theory. According to the black-hole bomb mechanism,the mass term of the incident field can works as the reflecting mirror, which may trigger the instability... |
gr-qc/0004066 | I. Kanatchikov | I. V. Kanatchikov | Precanonical Perspective in Quantum Gravity | 4 pages, LaTeX, espcrc2.sty. Based on the talk at the Third Meeting
on Constrained Dynamics and Quantum Gravity QG99 (Villasimius, Sardinia,
Italy, Sept. 13-17, 1999). To appear in Nucl. Phys. B Proc. Suppl. (2000).
Minor misprints in the version in print corrected | Nucl.Phys.Proc.Suppl. 88 (2000) 326-330 | 10.1016/S0920-5632(00)00795-7 | FSU TPI 13/99 (Jena preprint) | gr-qc math-ph math.MP | null | Quantization of general relativity in metric variables using ``precanonical''
quantization based on the De Donder-Weyl covariant Hamiltonian formulation is
outlined. Elements of classical geometry needed to formulate the (Dirac-like)
wave equation emerge from a self-consistency with the underlying quantum
dynamics of... | [
{
"created": "Wed, 19 Apr 2000 23:59:32 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kanatchikov",
"I. V.",
""
]
] | Quantization of general relativity in metric variables using ``precanonical'' quantization based on the De Donder-Weyl covariant Hamiltonian formulation is outlined. Elements of classical geometry needed to formulate the (Dirac-like) wave equation emerge from a self-consistency with the underlying quantum dynamics of t... |
gr-qc/9305024 | Robert Manuel Wald | Robert M. Wald | A Proposal for Solving the ``Problem of Time" in Canonical Quantum
Gravity | 15 pages | Phys.Rev.D48:2377-2381,1993 | 10.1103/PhysRevD.48.R2377 | null | gr-qc | null | The "problem of time" in canonical quantum gravity refers to the difficulties
involved in defining a Hilbert space structure on states -- and local
observables on this Hilbert space -- for a theory in which the spacetime metric
is treated as a quantum field, so no classical metrical or causal structure is
present on ... | [
{
"created": "Tue, 25 May 1993 19:42:55 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Wald",
"Robert M.",
""
]
] | The "problem of time" in canonical quantum gravity refers to the difficulties involved in defining a Hilbert space structure on states -- and local observables on this Hilbert space -- for a theory in which the spacetime metric is treated as a quantum field, so no classical metrical or causal structure is present on sp... |
gr-qc/9211001 | null | G. Grignani and G. Nardelli | Chern--Simons Gravity from 3+1 Dimensional Gravity | 9 pages (TeX manuscript) | Phys.Lett. B300 (1993) 38-43 | 10.1016/0370-2693(93)90745-4 | DFUPG-59-92, UTF-272-92 | gr-qc | null | In the context of a Poincar\'e gauge theoretical formulation, pure gravity in
3+1-dimensions is dimensionally reduced to gravity in 2+1-dimensions with or
without cosmological constant $\Lambda$. The dimensional reductions are
consistent with the gauge symmetries, mapping ISO(3, 1) gauge transformations
into ISO(2,1)... | [
{
"created": "Tue, 3 Nov 1992 10:20:22 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 1992 09:06:18 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Grignani",
"G.",
""
],
[
"Nardelli",
"G.",
""
]
] | In the context of a Poincar\'e gauge theoretical formulation, pure gravity in 3+1-dimensions is dimensionally reduced to gravity in 2+1-dimensions with or without cosmological constant $\Lambda$. The dimensional reductions are consistent with the gauge symmetries, mapping ISO(3, 1) gauge transformations into ISO(2,1) o... |
1912.06634 | Olivier Piguet | Matheus M.A. Paix\~ao and Olivier Piguet | Five dimensional Chern-Simons Gravity for the expanded (anti)-de Sitter
gauge group C$_5$ | 19 pages. Reference added. Small correction in Section 3, results
unchanged. Published in Eur. Phys. J. C 80, 138 (2020).
https://doi.org/10.1140 | null | 10.1140/epjc/s10052-020-7709-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Hamiltonian dynamics of a five-dimensional Chern-Simons theory
for the gauge algebra $C_5$ of Izaurieta, Rodriguez and Salgado, the so-called
S$_H$-expansion of the 5D (anti-)de Sitter algebra (a)ds, based on the cyclic
group $\mathbb{Z}_4$. The theory consists of a 1-form field containing the
(a)ds grav... | [
{
"created": "Fri, 13 Dec 2019 18:02:54 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jan 2020 13:51:53 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Feb 2020 19:09:46 GMT",
"version": "v3"
}
] | 2020-03-18 | [
[
"Paixão",
"Matheus M. A.",
""
],
[
"Piguet",
"Olivier",
""
]
] | We study the Hamiltonian dynamics of a five-dimensional Chern-Simons theory for the gauge algebra $C_5$ of Izaurieta, Rodriguez and Salgado, the so-called S$_H$-expansion of the 5D (anti-)de Sitter algebra (a)ds, based on the cyclic group $\mathbb{Z}_4$. The theory consists of a 1-form field containing the (a)ds gravit... |
0808.0025 | Etera R. Livine | Etera R. Livine, James P. Ryan | A Note on B-observables in Ponzano-Regge 3d Quantum Gravity | 17 pages | Class.Quant.Grav.26:035013,2009 | 10.1088/0264-9381/26/3/035013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the insertion and value of metric observables in the (discrete) path
integral formulation of the Ponzano-Regge spinfoam model for 3d quantum
gravity. In particular, we discuss the length spectrum and the relation between
insertion of such B-observables and gauge fixing in the path integral.
| [
{
"created": "Thu, 31 Jul 2008 21:23:18 GMT",
"version": "v1"
}
] | 2009-01-27 | [
[
"Livine",
"Etera R.",
""
],
[
"Ryan",
"James P.",
""
]
] | We study the insertion and value of metric observables in the (discrete) path integral formulation of the Ponzano-Regge spinfoam model for 3d quantum gravity. In particular, we discuss the length spectrum and the relation between insertion of such B-observables and gauge fixing in the path integral. |
gr-qc/0406012 | Gilles Esposito-Farese | Luc Blanchet, Thibault Damour, Gilles Esposito-Farese, Bala R. Iyer | Gravitational radiation from inspiralling compact binaries completed at
the third post-Newtonian order | 4 pages in 2-column format, LaTeX 2e, REVTeX 4, no figure | Phys.Rev.Lett.93:091101,2004 | 10.1103/PhysRevLett.93.091101 | null | gr-qc | null | The gravitational radiation from point particle binaries is computed at the
third post-Newtonian (3PN) approximation of general relativity. Three
previously introduced ambiguity parameters, coming from the Hadamard self-field
regularization of the 3PN source-type mass quadrupole moment, are consistently
determined by... | [
{
"created": "Thu, 3 Jun 2004 14:31:12 GMT",
"version": "v1"
}
] | 2009-06-11 | [
[
"Blanchet",
"Luc",
""
],
[
"Damour",
"Thibault",
""
],
[
"Esposito-Farese",
"Gilles",
""
],
[
"Iyer",
"Bala R.",
""
]
] | The gravitational radiation from point particle binaries is computed at the third post-Newtonian (3PN) approximation of general relativity. Three previously introduced ambiguity parameters, coming from the Hadamard self-field regularization of the 3PN source-type mass quadrupole moment, are consistently determined by m... |
1409.7754 | Matt Visser | Matt Visser (Victoria University of Wellington) | Thermality of the Hawking flux | V1: 13 pages. V2: Now 17 pages. 3 references added; other references
updated; new section on the relationship between past and future null
infinity; small edits throughout the text. V3: Now 19 pages. 4 more
references added; extra discussion/small edits. No physics changes | JHEP 1507 (2015) 009 | 10.1007/JHEP07(2015)009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Is the Hawking flux "thermal"? Unfortunately, the answer to this seemingly
innocent question depends on a number of often unstated, but quite crucial,
technical assumptions built into modern (mis-)interpretations of the word
"thermal". The original 1850's notions of thermality --- based on classical
thermodynamic rea... | [
{
"created": "Sat, 27 Sep 2014 02:28:39 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2015 04:29:22 GMT",
"version": "v2"
},
{
"created": "Wed, 6 May 2015 20:44:20 GMT",
"version": "v3"
}
] | 2017-11-28 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Is the Hawking flux "thermal"? Unfortunately, the answer to this seemingly innocent question depends on a number of often unstated, but quite crucial, technical assumptions built into modern (mis-)interpretations of the word "thermal". The original 1850's notions of thermality --- based on classical thermodynamic reaso... |
gr-qc/9405002 | Peter Peldan | Peter Peldan | Real Formulations of Complex Gravity and a Complex Formulation of Real
Gravity | 23 pages, CGPG-94/4-6 | Nucl.Phys. B430 (1994) 460-484 | 10.1016/0550-3213(94)00379-3 | null | gr-qc | null | Two gauge and diffeomorphism invariant theories on the Yang-Mills phase space
are studied. They are based on the Lie-algebras $so(1,3)$ and
$\widetilde{so(3)}$ -- the loop-algebra of $so(3)$. Although the theories are
manifestly real, they can both be reformulated to show that they describe
complex gravity and an inf... | [
{
"created": "Mon, 2 May 1994 14:28:48 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Peldan",
"Peter",
""
]
] | Two gauge and diffeomorphism invariant theories on the Yang-Mills phase space are studied. They are based on the Lie-algebras $so(1,3)$ and $\widetilde{so(3)}$ -- the loop-algebra of $so(3)$. Although the theories are manifestly real, they can both be reformulated to show that they describe complex gravity and an infin... |
1209.5171 | Lijing Shao | Lijing Shao, Norbert Wex, Michael Kramer | New Constraints on Preferred Frame Effects from Binary Pulsars | 3 pages, 1 figure; submitted to Proceedings of IAU Symposium 291 --
Neutron Stars and Pulsars: Challenges and Opportunities after 80 years, (ed.)
J. van Leeuwen | Proceedings of the International Astronomical Union, IAU Symposium
291:496-498, 2013 | 10.1017/S1743921312024647 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Preferred frame effects (PFEs) are predicted by a number of alternative
gravity theories which include vector or additional tensor fields, besides the
canonical metric tensor. In the framework of parametrized post-Newtonian (PPN)
formalism, we investigate PFEs in the orbital dynamics of binary pulsars,
characterized ... | [
{
"created": "Mon, 24 Sep 2012 07:20:42 GMT",
"version": "v1"
}
] | 2013-06-04 | [
[
"Shao",
"Lijing",
""
],
[
"Wex",
"Norbert",
""
],
[
"Kramer",
"Michael",
""
]
] | Preferred frame effects (PFEs) are predicted by a number of alternative gravity theories which include vector or additional tensor fields, besides the canonical metric tensor. In the framework of parametrized post-Newtonian (PPN) formalism, we investigate PFEs in the orbital dynamics of binary pulsars, characterized by... |
2310.16643 | Spandan Minwalla | Spandan Minwalla | Angular Location of the $n^{th}$ Einstein Ring at large $n$ | 32 Pages, 12 figures | null | null | null | gr-qc astro-ph.GA astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We perform a matched asymptotic expansion to find an analytic formula for the
trajectory of a light ray in a Schwarzschild metric, in a power series
expansion in the deviation of the impact parameter from its critical value. We
present results valid to second sub leading order in this expansion. We use
these results ... | [
{
"created": "Wed, 25 Oct 2023 13:54:02 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Dec 2023 07:35:27 GMT",
"version": "v2"
}
] | 2023-12-27 | [
[
"Minwalla",
"Spandan",
""
]
] | We perform a matched asymptotic expansion to find an analytic formula for the trajectory of a light ray in a Schwarzschild metric, in a power series expansion in the deviation of the impact parameter from its critical value. We present results valid to second sub leading order in this expansion. We use these results to... |
1007.4904 | Hamid Reza Sepangi | A. Sefiedgar and H. R. Sepangi | Brane-world black hole entropy from modified dispersion relations | 9 pages, 4 figures, to appear in PLB | Phys.Lett.B692:281-285,2010 | 10.1016/j.physletb.2010.07.051 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The entropy of the Reissner-N\"{o}rdstrom black hole is studied within the
context of a brane-world scenario. Such a black hole is a solution of the
Einstein field equations on the brane, possessing a tidal charge which is a
reflection of the extra dimension. We use the modified dispersion relation to
obtain the entr... | [
{
"created": "Wed, 28 Jul 2010 09:06:16 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Sefiedgar",
"A.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | The entropy of the Reissner-N\"{o}rdstrom black hole is studied within the context of a brane-world scenario. Such a black hole is a solution of the Einstein field equations on the brane, possessing a tidal charge which is a reflection of the extra dimension. We use the modified dispersion relation to obtain the entrop... |
gr-qc/9310040 | Khatsymovsky | V.Khatsymovsky | How to construct quantum measure in Regge calculus? | 11 pages, Plain LaTeX, preprint UUITP-21/1993 | Class.Quant.Grav.11:2443-2453,1994 | 10.1088/0264-9381/11/10/006 | null | gr-qc | null | We propose the following way of constructing quantum measure in Regge
calculus: the full discrete Regge manifold is made continuous in some direction
by tending corresponding dimensions of simplices to zero, then functional
integral measure corresponding to the canonical quantization (with continuous
coordinate playi... | [
{
"created": "Fri, 29 Oct 1993 10:04:06 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Khatsymovsky",
"V.",
""
]
] | We propose the following way of constructing quantum measure in Regge calculus: the full discrete Regge manifold is made continuous in some direction by tending corresponding dimensions of simplices to zero, then functional integral measure corresponding to the canonical quantization (with continuous coordinate playing... |
1305.2640 | Massimiliano Rinaldi | Andre Fuzfa, Massimiliano Rinaldi, Sandrine Schlogel | Particlelike distributions of the Higgs field nonminimally coupled to
gravity | Matches version to appear on PRL. Note: title changed upon suggestion
of PRL editors | Phys. Rev. Lett. 111, 121103 (2013) | 10.1103/PhysRevLett.111.121103 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When the Higgs field is nonminimally coupled to gravity, there exists a
family of spherically symmetric particlelike solutions to the field equations.
These monopoles are the only globally regular and asymptotically flat
distributions with finite energy of the Higgs field around compact objects.
Moreover, spontaneous... | [
{
"created": "Sun, 12 May 2013 22:16:51 GMT",
"version": "v1"
},
{
"created": "Fri, 24 May 2013 10:08:27 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Aug 2013 07:48:45 GMT",
"version": "v3"
},
{
"created": "Tue, 10 Sep 2013 14:22:01 GMT",
"version": "v4"
}
] | 2013-09-19 | [
[
"Fuzfa",
"Andre",
""
],
[
"Rinaldi",
"Massimiliano",
""
],
[
"Schlogel",
"Sandrine",
""
]
] | When the Higgs field is nonminimally coupled to gravity, there exists a family of spherically symmetric particlelike solutions to the field equations. These monopoles are the only globally regular and asymptotically flat distributions with finite energy of the Higgs field around compact objects. Moreover, spontaneous s... |
1908.03456 | Francois Larrouturou | Antonio de Felice, Fran\c{c}ois Larrouturou, Shinji Mukohyama and
Michele Oliosi | On the absence of conformally flat slicings of the Kerr spacetime | 12 pages No-go result on spatially flat slicings upgraded from Kerr
spacetimes to Kerr-de Sitter spacetimes | Phys. Rev. D 100, 124044 (2019) | 10.1103/PhysRevD.100.124044 | YITP-19-75, IPMU19-0106 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work investigates the possibility of achieving a conformally flat
slicing of the Kerr spacetime. We consider a hypersurface of the form $t =
F(r,\theta,a)$, where $(t,r,\theta,\phi)$ are the Boyer-Lindquist coordinates,
solve for a vanishing Cotton-York tensor of the induced metric order by order
in the spin par... | [
{
"created": "Fri, 9 Aug 2019 13:52:17 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Nov 2019 17:40:53 GMT",
"version": "v2"
}
] | 2019-12-25 | [
[
"de Felice",
"Antonio",
""
],
[
"Larrouturou",
"François",
""
],
[
"Mukohyama",
"Shinji",
""
],
[
"Oliosi",
"Michele",
""
]
] | This work investigates the possibility of achieving a conformally flat slicing of the Kerr spacetime. We consider a hypersurface of the form $t = F(r,\theta,a)$, where $(t,r,\theta,\phi)$ are the Boyer-Lindquist coordinates, solve for a vanishing Cotton-York tensor of the induced metric order by order in the spin param... |
2310.02445 | Slimane Zaim | Abdellah Touati and Slimane Zaim | Quantum tunneling from Schwarzschild black hole in non-commutative gauge
theory of gravity | 9 pages, 5 figures | Phys. Lett. B 848 (2024) 138335 | 10.1016/j.physletb.2023.138335 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this letter, we present the first study of Hawking radiation as a
tunneling process within the framework of non-commutative (NC) gauge theory of
gravity. First, we reconstruct the non-commutative Schwarzschild black hole (NC
SBH) within the gauge theory of gravity, employing the Seiberg-Witten (SW) map
and the sta... | [
{
"created": "Tue, 3 Oct 2023 21:28:16 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Nov 2023 22:42:21 GMT",
"version": "v2"
}
] | 2023-11-28 | [
[
"Touati",
"Abdellah",
""
],
[
"Zaim",
"Slimane",
""
]
] | In this letter, we present the first study of Hawking radiation as a tunneling process within the framework of non-commutative (NC) gauge theory of gravity. First, we reconstruct the non-commutative Schwarzschild black hole (NC SBH) within the gauge theory of gravity, employing the Seiberg-Witten (SW) map and the star ... |
gr-qc/0305104 | Simon Davis | Simon Davis | The Quantum Cosmological Wavefunction at Very Early Times for a
Quadratic Gravity Theory | Tex, 13 pages | null | 10.1088/0264-9381/20/13/331 | University of Potsdam preprint 2003/04 | gr-qc | null | The quantum cosmological wavefunction for a quadratic gravity theory derived
from the heterotic string effective action is obtained near the inflationary
epoch and during the initial Planck era. Neglecting derivatives with respect to
the scalar field, the wavefunction would satisfy a third-order differential
equation... | [
{
"created": "Wed, 28 May 2003 14:20:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Davis",
"Simon",
""
]
] | The quantum cosmological wavefunction for a quadratic gravity theory derived from the heterotic string effective action is obtained near the inflationary epoch and during the initial Planck era. Neglecting derivatives with respect to the scalar field, the wavefunction would satisfy a third-order differential equation n... |
2004.11285 | Bob Holdom | Bob Holdom | Damping of gravitational waves in 2-2-holes | 13 pages, 6 figures, published version | Physics Letters B 813 (2021) 136023 | 10.1016/j.physletb.2020.136023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A 2-2-hole is an explicit realization of a horizonless object that can still
very closely resemble a BH. An ordinary relativistic gas can serve as the
matter source for the 2-2-hole solution of quadratic gravity, and this leads to
a calculable area-law entropy. Here we show that it also leads to an estimate
of the da... | [
{
"created": "Thu, 23 Apr 2020 16:14:25 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2020 19:13:00 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Dec 2020 18:39:25 GMT",
"version": "v3"
}
] | 2020-12-29 | [
[
"Holdom",
"Bob",
""
]
] | A 2-2-hole is an explicit realization of a horizonless object that can still very closely resemble a BH. An ordinary relativistic gas can serve as the matter source for the 2-2-hole solution of quadratic gravity, and this leads to a calculable area-law entropy. Here we show that it also leads to an estimate of the damp... |
2006.08674 | Vasilios Zarikas | Vasilios Zarikas and Georgios Kofinas | Singularities and Phenomenological aspects of Asymptotic Safe Gravity | null | Journal of Physics: Conference Series, Volume 1051, XX
International Meeting "Physical Interpretations of Relativity Theory 2017"
3-6 July 2017, Moscow, Russian Federation | 10.1088/1742-6596/1051/1/012028 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | Asymptotic Safety (AS) Program for quantum gravity keeps the same fields and
symmetries with General Relativity and studies the associated gravitational
action as a fundamental part of the complete theory at the nonperturbative
level with the help of functional renormalization group (RG) techniques. An
important phen... | [
{
"created": "Mon, 15 Jun 2020 18:20:34 GMT",
"version": "v1"
}
] | 2020-06-17 | [
[
"Zarikas",
"Vasilios",
""
],
[
"Kofinas",
"Georgios",
""
]
] | Asymptotic Safety (AS) Program for quantum gravity keeps the same fields and symmetries with General Relativity and studies the associated gravitational action as a fundamental part of the complete theory at the nonperturbative level with the help of functional renormalization group (RG) techniques. An important phenom... |
2305.14924 | Zhenyu Zhang | Zhenyu Zhang, Yehui Hou, Minyong Guo | Observational signatures of rotating black holes in the semiclassical
gravity with trace anomaly | 17 pages, 8 figures, major revision | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | In a recent work by Fernandes [arXiv:2305.10382], an exact stationary and
axisymmetric solution was discovered in semiclassical gravity with type-A trace
anomaly, identified as a quantum-corrected version of the Kerr black hole. In
this study, we explore the observational signatures of this black hole
solution. Our i... | [
{
"created": "Wed, 24 May 2023 09:09:38 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Nov 2023 09:07:58 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Mar 2024 12:14:08 GMT",
"version": "v3"
}
] | 2024-03-19 | [
[
"Zhang",
"Zhenyu",
""
],
[
"Hou",
"Yehui",
""
],
[
"Guo",
"Minyong",
""
]
] | In a recent work by Fernandes [arXiv:2305.10382], an exact stationary and axisymmetric solution was discovered in semiclassical gravity with type-A trace anomaly, identified as a quantum-corrected version of the Kerr black hole. In this study, we explore the observational signatures of this black hole solution. Our inv... |
2310.00284 | Hong Wang | Hong Wang, Yuxuan Wu, Ran Li and Jin Wang | Wormhole influence on the false vacuum bubble tunneling | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we generalize the work of Farhi, Guth and Guven [Nucl. Phys. B
339 (1990) 417] to include a wormhole effect. We study the influence of the
wormhole on the tunneling of the false vacuum bubble. The spherically symmetric
bubble has two domain walls. The classical dynamics of each domain wall are
constrai... | [
{
"created": "Sat, 30 Sep 2023 07:24:21 GMT",
"version": "v1"
}
] | 2023-10-03 | [
[
"Wang",
"Hong",
""
],
[
"Wu",
"Yuxuan",
""
],
[
"Li",
"Ran",
""
],
[
"Wang",
"Jin",
""
]
] | In this study, we generalize the work of Farhi, Guth and Guven [Nucl. Phys. B 339 (1990) 417] to include a wormhole effect. We study the influence of the wormhole on the tunneling of the false vacuum bubble. The spherically symmetric bubble has two domain walls. The classical dynamics of each domain wall are constraine... |
1803.05564 | Zhoujian Cao Dr | Xiaokai He, Jiliang Jing and Zhoujian Cao | Relationship between Bondi-Sachs quantities and source of gravitational
radiation in asymptotically de Sitter spacetime | 11 pages | International Journal of Modern Physics D, Vol. 27, No. 4 (2018)
1850046 | 10.1142/S0218271818500463 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational radiation plays an important role in astrophysics. Based on the
fact that our universe is expanding, the gravitational radiation when a
positive cosmological constant is presented has been studied along with two
different ways recently, one is the Bondi-Sachs (BS) framework in which the
result is shown ... | [
{
"created": "Thu, 15 Mar 2018 01:21:58 GMT",
"version": "v1"
}
] | 2018-03-28 | [
[
"He",
"Xiaokai",
""
],
[
"Jing",
"Jiliang",
""
],
[
"Cao",
"Zhoujian",
""
]
] | Gravitational radiation plays an important role in astrophysics. Based on the fact that our universe is expanding, the gravitational radiation when a positive cosmological constant is presented has been studied along with two different ways recently, one is the Bondi-Sachs (BS) framework in which the result is shown by... |
1502.07320 | Pouria Pedram | Pouria Pedram | Generalized uncertainty principle and the conformally coupled scalar
field quantum cosmology | 10 pages, 4 figures, to appear in Physical Review D | Phys. Rev. D 91 (2015) 063517 | 10.1103/PhysRevD.91.063517 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We exactly solve the Wheeler-DeWitt equation for the closed homogeneous and
isotropic quantum cosmology in the presence of a conformally coupled scalar
field and in the context of the generalized uncertainty principle. This form of
generalized uncertainty principle is motivated by the black hole physics and it
predic... | [
{
"created": "Wed, 25 Feb 2015 19:59:05 GMT",
"version": "v1"
}
] | 2015-03-12 | [
[
"Pedram",
"Pouria",
""
]
] | We exactly solve the Wheeler-DeWitt equation for the closed homogeneous and isotropic quantum cosmology in the presence of a conformally coupled scalar field and in the context of the generalized uncertainty principle. This form of generalized uncertainty principle is motivated by the black hole physics and it predicts... |
0911.3436 | Muxin Han | Muxin Han | Canonical Path-Integral Measures for Holst and Plebanski Gravity. II.
Gauge Invariance and Physical Inner Product | 34 pages | Class.Quant.Grav.27:245015,2010 | 10.1088/0264-9381/27/24/245015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article serves as a continuation for the discussion in arXiv:0911.3433,
we analyze the invariance properties of the gravity path-integral measure
derived from canonical framework, and discuss which path-integral formula may
be employed in the concrete computation e.g. constructing a spin-foam model, so
that the ... | [
{
"created": "Tue, 17 Nov 2009 23:57:57 GMT",
"version": "v1"
}
] | 2010-12-06 | [
[
"Han",
"Muxin",
""
]
] | This article serves as a continuation for the discussion in arXiv:0911.3433, we analyze the invariance properties of the gravity path-integral measure derived from canonical framework, and discuss which path-integral formula may be employed in the concrete computation e.g. constructing a spin-foam model, so that the fi... |
2104.08935 | David McNutt | D. D. McNutt, W. Julius, M. Gorban, B. Mattingly, P. Brown, G. Cleaver | Geometric surfaces: An invariant characterization of spherically
symmetric black hole horizons and wormhole throats | 22 pages | Phys. Rev. D 103, 124024 (2021) | 10.1103/PhysRevD.103.124024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a spherically symmetric line element which admits either a black
hole geometry or a wormhole geometry and show that in both cases the apparent
horizon or the wormhole throat is partially characterized by the zero-set of a
single curvature invariant. The detection of the apparent horizon by this
invariant ... | [
{
"created": "Sun, 18 Apr 2021 19:19:59 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jun 2021 07:49:18 GMT",
"version": "v2"
}
] | 2021-06-23 | [
[
"McNutt",
"D. D.",
""
],
[
"Julius",
"W.",
""
],
[
"Gorban",
"M.",
""
],
[
"Mattingly",
"B.",
""
],
[
"Brown",
"P.",
""
],
[
"Cleaver",
"G.",
""
]
] | We consider a spherically symmetric line element which admits either a black hole geometry or a wormhole geometry and show that in both cases the apparent horizon or the wormhole throat is partially characterized by the zero-set of a single curvature invariant. The detection of the apparent horizon by this invariant is... |
gr-qc/9605053 | Dieter Maison | D. Maison | Solitons of the Einstein-Yang-Mills Theory | 13 pages latex + 10 figures | null | 10.1007/978-94-011-5812-1_42 | MPI-PhT/96-41 | gr-qc | null | Subject of this talk is an overview of results on self-gravitating solitons
of the classical Yang-Mills-Higgs theory. One finds essentially two classes of
solitons, one of them corresponding to the magnetic monopoles the other one to
the sphalerons of flat space. The coupling to the gravitational field leads to
new f... | [
{
"created": "Fri, 24 May 1996 15:41:25 GMT",
"version": "v1"
}
] | 2016-01-27 | [
[
"Maison",
"D.",
""
]
] | Subject of this talk is an overview of results on self-gravitating solitons of the classical Yang-Mills-Higgs theory. One finds essentially two classes of solitons, one of them corresponding to the magnetic monopoles the other one to the sphalerons of flat space. The coupling to the gravitational field leads to new fea... |
0901.4634 | Houri Ziaeepour | Houri Ziaeepour | And what if gravity is intrinsically quantic ? | 8 pages, 1 figure. To appear in the proceedings of the DICE2008
conference, Castiglioncello, Tuscany, Italy, 22-26 Sep. 2008. V2: some typos
removed | J.Phys.Conf.Ser.174:012027,2009 | 10.1088/1742-6596/174/1/012027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the early days of search for a quantum theory of gravity the attempts
have been mostly concentrated on the quantization of an otherwise classical
system. The two most contentious candidate theories of gravity, sting theory
and quantum loop gravity are based on a quantum field theory - the latter is a
quantum fi... | [
{
"created": "Thu, 29 Jan 2009 10:05:21 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Feb 2009 12:14:05 GMT",
"version": "v2"
}
] | 2009-07-24 | [
[
"Ziaeepour",
"Houri",
""
]
] | Since the early days of search for a quantum theory of gravity the attempts have been mostly concentrated on the quantization of an otherwise classical system. The two most contentious candidate theories of gravity, sting theory and quantum loop gravity are based on a quantum field theory - the latter is a quantum fiel... |
gr-qc/0504118 | Gergely Sz\'ekely | Judit X. Madarasz, Istvan Nemeti and Gergely Szekely | Twin Paradox and the logical foundation of relativity theory | 24 pages, 6 figures | Found.Phys. 36 (2006) 681-714 | 10.1007/s10701-005-9041-9 | null | gr-qc math-ph math.LO math.MP | null | We study the foundation of space-time theory in the framework of first-order
logic (FOL). Since the foundation of mathematics has been successfully carried
through (via set theory) in FOL, it is not entirely impossible to do the same
for space-time theory (or relativity). First we recall a simple and streamlined
FOL-... | [
{
"created": "Mon, 25 Apr 2005 07:19:32 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jul 2005 19:11:02 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Aug 2005 12:30:16 GMT",
"version": "v3"
}
] | 2013-02-19 | [
[
"Madarasz",
"Judit X.",
""
],
[
"Nemeti",
"Istvan",
""
],
[
"Szekely",
"Gergely",
""
]
] | We study the foundation of space-time theory in the framework of first-order logic (FOL). Since the foundation of mathematics has been successfully carried through (via set theory) in FOL, it is not entirely impossible to do the same for space-time theory (or relativity). First we recall a simple and streamlined FOL-ax... |
gr-qc/0406084 | Jacek Jezierski | Jacek Jezierski | Geometry of crossing null shells | 24 pages, 1 figure | J.Math.Phys.44:641-661,2003 | 10.1063/1.1512973 | null | gr-qc | null | New geometric objects on null thin layers are introduced and their importance
for crossing null-like shells are discussed. The Barrab\`es--Israel equations
are represented in a new geometric form and they split into decoupled system of
equations for two different geometric objects: tensor density ${\bf G}^a{_b}$
and ... | [
{
"created": "Mon, 21 Jun 2004 13:21:17 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Jezierski",
"Jacek",
""
]
] | New geometric objects on null thin layers are introduced and their importance for crossing null-like shells are discussed. The Barrab\`es--Israel equations are represented in a new geometric form and they split into decoupled system of equations for two different geometric objects: tensor density ${\bf G}^a{_b}$ and ve... |
2003.03194 | Saibal Ray | Shounak Ghosh, A.D. Kanfon, Amit Das, M.J.S. Houndjo, I.G. Salako and
Saibal Ray | Gravastars in $f(\mathbb{T},\mathcal{T})$ gravity | 19 pages, 5 figures | International Journal of Modern Physics A, Vol. 35 (2020) 2050017
(20 pages) | 10.1142/S0217751X20500177 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a stellar model under the $f(\mathbb{T},\mathcal{T})$ gravity
following Mazur-Mottola's conjecture [Mazur (2001), Mazur (2004)] known as
gravastar which is generally believed as a viable alternative to black hole.
The gravastar consists of three regions, viz., (I) Interior region, (II)
Intermediate shell r... | [
{
"created": "Thu, 5 Mar 2020 16:44:43 GMT",
"version": "v1"
}
] | 2020-03-09 | [
[
"Ghosh",
"Shounak",
""
],
[
"Kanfon",
"A. D.",
""
],
[
"Das",
"Amit",
""
],
[
"Houndjo",
"M. J. S.",
""
],
[
"Salako",
"I. G.",
""
],
[
"Ray",
"Saibal",
""
]
] | We propose a stellar model under the $f(\mathbb{T},\mathcal{T})$ gravity following Mazur-Mottola's conjecture [Mazur (2001), Mazur (2004)] known as gravastar which is generally believed as a viable alternative to black hole. The gravastar consists of three regions, viz., (I) Interior region, (II) Intermediate shell reg... |
1009.5971 | Andrey Shoom A | Shohreh Abdolrahimi, Andrey A. Shoom, and Don N. Page | Distorted 5-dimensional vacuum black hole | 20 pages, 9 figures | Phys.Rev.D82:124039,2010 | 10.1103/PhysRevD.82.124039 | Alberta-Thy-12-10 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study how the distortion generated by a static and neutral
distribution of external matter affects a 5-dimensional
Schwarzschild-Tangherlini black hole. A solution representing a particular
class of such distorted black holes admits an RxU(1)xU(1) isometry group. We
show that there exists a certain d... | [
{
"created": "Wed, 29 Sep 2010 18:42:57 GMT",
"version": "v1"
}
] | 2011-01-17 | [
[
"Abdolrahimi",
"Shohreh",
""
],
[
"Shoom",
"Andrey A.",
""
],
[
"Page",
"Don N.",
""
]
] | In this paper we study how the distortion generated by a static and neutral distribution of external matter affects a 5-dimensional Schwarzschild-Tangherlini black hole. A solution representing a particular class of such distorted black holes admits an RxU(1)xU(1) isometry group. We show that there exists a certain dua... |
gr-qc/9605017 | James E. Lidsey | James E. Lidsey | Inflationary and Deflationary Branches in Extended Pre--Big Bang
Cosmology | 20 pages, latex, 3 figures available on request | Phys.Rev. D55 (1997) 3303-3312 | 10.1103/PhysRevD.55.3303 | null | gr-qc | null | The pre--big bang cosmological scenario is studied within the context of the
Brans--Dicke theory of gravity. An epoch of superinflationary expansion may
occur in the pre--big bang phase of the Universe's history in a certain region
of parameter space. Two models are considered that contain a cosmological
constant in ... | [
{
"created": "Wed, 8 May 1996 11:17:53 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lidsey",
"James E.",
""
]
] | The pre--big bang cosmological scenario is studied within the context of the Brans--Dicke theory of gravity. An epoch of superinflationary expansion may occur in the pre--big bang phase of the Universe's history in a certain region of parameter space. Two models are considered that contain a cosmological constant in th... |
1406.5398 | Anthony Preston | Anthony W. H. Preston and Tim R. Morris | Cosmological back-reaction in modified gravity and its implications for
dark energy | 23 pages, references updated, some arguments clarified | JCAP09(2014)017 | 10.1088/1475-7516/2014/09/017 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effective stress-energy tensor induced by cosmological
inhomogeneity in $f(R)=R+cR^2$ and equivalent scalar-tensor theories, motivated
both by models of early universe inflation and by phenomenological alternative
cosmologies to the standard $\Lambda$-CDM. We use Green and Wald's framework
for averaging ... | [
{
"created": "Fri, 20 Jun 2014 14:21:04 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Aug 2014 14:56:05 GMT",
"version": "v2"
}
] | 2014-09-10 | [
[
"Preston",
"Anthony W. H.",
""
],
[
"Morris",
"Tim R.",
""
]
] | We study the effective stress-energy tensor induced by cosmological inhomogeneity in $f(R)=R+cR^2$ and equivalent scalar-tensor theories, motivated both by models of early universe inflation and by phenomenological alternative cosmologies to the standard $\Lambda$-CDM. We use Green and Wald's framework for averaging ov... |
gr-qc/0011021 | Spiros Cotsakis | Spiros Cotsakis, George Flessas, Peter Leach and Laurent Querella | Ever-expanding, Isotropizing, Quadratic Cosmologies | 12 pp, latex, gc style, to appear in Grav.Cosm | Grav.Cosmol. 6 (2000) 291-302 | null | null | gr-qc | null | We consider some aspects of the global evolution problem of Hamiltonian
homogeneous, anisotropic cosmologies derived from a purely quadratic action
functional of the scalar curvature. We show that models can isotropize in the
positive asymptotic direction and that quadratic diagonal Bianchi IX models do
not recollaps... | [
{
"created": "Mon, 6 Nov 2000 18:04:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cotsakis",
"Spiros",
""
],
[
"Flessas",
"George",
""
],
[
"Leach",
"Peter",
""
],
[
"Querella",
"Laurent",
""
]
] | We consider some aspects of the global evolution problem of Hamiltonian homogeneous, anisotropic cosmologies derived from a purely quadratic action functional of the scalar curvature. We show that models can isotropize in the positive asymptotic direction and that quadratic diagonal Bianchi IX models do not recollapse ... |
2007.05641 | Mart\'in G. Richarte MR | Iarley P. Lobo, Martin G. Richarte, J. P. Morais Gra\c{c}a, H.
Moradpour | Thin-shell wormholes in Rastall gravity | 26 pages, 7 figures, and 4 tables | Eur. Phys. J. Plus (2020) 135:550 | 10.1140/epjp/s13360-020-00553-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We constructed thin-shell wormholes using the well-known "cut and paste"
technique for static black holes sourced by an anisotropic fluid within the
context of the Rastall gravity. Using the generalized Lanczos equations we
explored the energy conditions at the wormhole's throat along with the
traversability conditio... | [
{
"created": "Fri, 10 Jul 2020 23:03:18 GMT",
"version": "v1"
}
] | 2020-07-14 | [
[
"Lobo",
"Iarley P.",
""
],
[
"Richarte",
"Martin G.",
""
],
[
"Graça",
"J. P. Morais",
""
],
[
"Moradpour",
"H.",
""
]
] | We constructed thin-shell wormholes using the well-known "cut and paste" technique for static black holes sourced by an anisotropic fluid within the context of the Rastall gravity. Using the generalized Lanczos equations we explored the energy conditions at the wormhole's throat along with the traversability condition.... |
0806.0595 | Mairi Sakellariadou | William Nelson and Mairi Sakellariadou (KCL London) | Unique factor ordering in the continuum limit of LQC | 12 pages | Phys.Rev.D78:024006,2008 | 10.1103/PhysRevD.78.024006 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the factor ordering ambiguities associated with the loop
quantisation of the gravitational part of the cosmological Hamiltonian
constraint, disappear at the level of Wheeler-DeWitt equation only for a
particular choice of lattice refinement model, which coincides with constraints
imposed from phenomenolo... | [
{
"created": "Tue, 3 Jun 2008 17:06:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nelson",
"William",
"",
"KCL London"
],
[
"Sakellariadou",
"Mairi",
"",
"KCL London"
]
] | We show that the factor ordering ambiguities associated with the loop quantisation of the gravitational part of the cosmological Hamiltonian constraint, disappear at the level of Wheeler-DeWitt equation only for a particular choice of lattice refinement model, which coincides with constraints imposed from phenomenologi... |
1412.8636 | Vladimir Karas | Vladimir Karas | Stationary electro-vacuum fields around black holes | 19 pages, 5 figures, submitted to the Proceedings of RAGtime:
Workshops on black holes and neutron stars | Proceedings of RAGtime 10-13: Workshops on Black Holes and Neutron
Stars, eds. Z. Stuchlik, G. Torok, T. Pechacek (Silesian University, Opava),
pp. 75-92 (2014) | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the second lecture of `RAGtime' series on electrodynamical effects
near black holes. We will summarize the basic equations of relativistic
electrodynamics in terms of spin-coefficient (Newman-Penrose) formalism. The
aim of the lecture is to present important relations that hold for exact
electro-vacuum soluti... | [
{
"created": "Tue, 30 Dec 2014 14:17:58 GMT",
"version": "v1"
}
] | 2017-02-14 | [
[
"Karas",
"Vladimir",
""
]
] | This is the second lecture of `RAGtime' series on electrodynamical effects near black holes. We will summarize the basic equations of relativistic electrodynamics in terms of spin-coefficient (Newman-Penrose) formalism. The aim of the lecture is to present important relations that hold for exact electro-vacuum solution... |
1811.00394 | Mark Robert Baker | Mark Robert Baker, Sergei Kuzmin | A connection between linearized Gauss-Bonnet gravity and classical
electrodynamics | 12 pages | International Journal of Modern Physics D, Vol. 28, No. 07,
1950092 (2019) | 10.1142/S0218271819500925 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A connection between linearized Gauss-Bonnet gravity and classical
electrodynamics is found by developing a procedure which can be used to derive
completely gauge invariant models. The procedure involves building the most
general Lagrangian for a particular order of derivatives ($N$) and rank of
tensor potential ($M$... | [
{
"created": "Wed, 31 Oct 2018 15:32:54 GMT",
"version": "v1"
}
] | 2020-07-28 | [
[
"Baker",
"Mark Robert",
""
],
[
"Kuzmin",
"Sergei",
""
]
] | A connection between linearized Gauss-Bonnet gravity and classical electrodynamics is found by developing a procedure which can be used to derive completely gauge invariant models. The procedure involves building the most general Lagrangian for a particular order of derivatives ($N$) and rank of tensor potential ($M$),... |
1409.5800 | Zachary Mark | Zachary Mark, Huan Yang, Aaron Zimmerman, Yanbei Chen | The Quasinormal Modes of Weakly Charged Kerr-Newman Spacetimes | 4+3 pages, 2 figures, data (along with a read-me file) provided for
eight modes | Phys. Rev. D 91, 044025 (2015) | 10.1103/PhysRevD.91.044025 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The resonant mode spectrum of the Kerr-Newman spacetime is presently unknown.
These modes, called the quasinormal modes, play a central role in determining
the stability of Kerr-Newman black holes and their response to perturbations.
We present a new formalism, generalized from time-independent perturbation
theory in... | [
{
"created": "Fri, 19 Sep 2014 20:00:41 GMT",
"version": "v1"
}
] | 2015-03-05 | [
[
"Mark",
"Zachary",
""
],
[
"Yang",
"Huan",
""
],
[
"Zimmerman",
"Aaron",
""
],
[
"Chen",
"Yanbei",
""
]
] | The resonant mode spectrum of the Kerr-Newman spacetime is presently unknown. These modes, called the quasinormal modes, play a central role in determining the stability of Kerr-Newman black holes and their response to perturbations. We present a new formalism, generalized from time-independent perturbation theory in q... |
1905.07956 | Srishti Tiwari | Srishti Tiwari, Gopakumar Achamveedu, Maria Haney, Phurailatapam
Hemantakumar | Ready-to-use Fourier domain templates for compact binaries inspiraling
along moderately eccentric orbits | 32 Pages, 3 figures; Accepted for publication in Physical Review D | null | 10.1103/PhysRevD.99.124008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive analytic expressions that provide Fourier domain gravitational wave
(GW) response function for compact binaries inspiraling along moderately
eccentric orbits. These expressions include amplitude corrections to the two GW
polarization states that are accurate to the first post-Newtonian (PN) order.
Additiona... | [
{
"created": "Mon, 20 May 2019 09:28:02 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2019 11:34:43 GMT",
"version": "v2"
}
] | 2019-06-19 | [
[
"Tiwari",
"Srishti",
""
],
[
"Achamveedu",
"Gopakumar",
""
],
[
"Haney",
"Maria",
""
],
[
"Hemantakumar",
"Phurailatapam",
""
]
] | We derive analytic expressions that provide Fourier domain gravitational wave (GW) response function for compact binaries inspiraling along moderately eccentric orbits. These expressions include amplitude corrections to the two GW polarization states that are accurate to the first post-Newtonian (PN) order. Additionall... |
gr-qc/9709035 | Atsushi Taruya | A.Taruya and Y.Nambu | Cosmological perturbation with two scalar fields in reheating after
inflation | 13 pages, 2 Encapsulated Postscript figures, revtex, references are
added and type miss is corrected | Phys.Lett.B428:37-43,1998 | 10.1016/S0370-2693(98)00378-5 | DPNU-97-37 | gr-qc astro-ph | null | We investigate the cosmological perturbation of two-scalar field model during
the reheating phase after inflation. Using the exact solution of the
perturbation in long-wavelength limit, which is expressed in terms of the
background quantities, we analyze the behavior of the metric perturbation. The
oscillating inflat... | [
{
"created": "Mon, 15 Sep 1997 10:14:13 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 1998 20:00:33 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Feb 1998 04:15:33 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Taruya",
"A.",
""
],
[
"Nambu",
"Y.",
""
]
] | We investigate the cosmological perturbation of two-scalar field model during the reheating phase after inflation. Using the exact solution of the perturbation in long-wavelength limit, which is expressed in terms of the background quantities, we analyze the behavior of the metric perturbation. The oscillating inflaton... |
gr-qc/9708029 | Pasi Tapio Repo | Jarmo Makela and Pasi Repo | A Quantum Mechanical Model of the Reissner-Nordstrom Black Hole | 37 pages, Plain TeX, no figures | Phys.Rev. D57 (1998) 4899-4916 | 10.1103/PhysRevD.57.4899 | JYFL Preprint 9/1997 | gr-qc | null | We consider a Hamiltonian quantum theory of spherically symmetric,
asymptotically flat electrovacuum spacetimes. The physical phase space of such
spacetimes is spanned by the mass and the charge parameters $M$ and $Q$ of the
Reissner-Nordstr\"{o}m black hole, together with the corresponding canonical
momenta. In this... | [
{
"created": "Fri, 15 Aug 1997 11:00:09 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Makela",
"Jarmo",
""
],
[
"Repo",
"Pasi",
""
]
] | We consider a Hamiltonian quantum theory of spherically symmetric, asymptotically flat electrovacuum spacetimes. The physical phase space of such spacetimes is spanned by the mass and the charge parameters $M$ and $Q$ of the Reissner-Nordstr\"{o}m black hole, together with the corresponding canonical momenta. In this f... |
gr-qc/9304030 | Filipe de Moraes Paiva | F. M. Paiva and C. Romero | On the limits of Brans-Dicke spacetimes: a coordinate-free approach | LaTeX, 16 pp, report DF/UFPB/02-93 | Gen.Rel.Grav.25:1305-1317,1993 | 10.1007/BF00759035 | null | gr-qc | null | We investigate the limit of Brans-Dicke spacetimes as the scalar field
coupling constant omega tends to infinity applying a coordinate-free technique.
We obtain the limits of some known exact solutions. It is shown that these
limits may not correspond to similar solutions in the general relativity
theory.
| [
{
"created": "Tue, 20 Apr 1993 22:31:39 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Paiva",
"F. M.",
""
],
[
"Romero",
"C.",
""
]
] | We investigate the limit of Brans-Dicke spacetimes as the scalar field coupling constant omega tends to infinity applying a coordinate-free technique. We obtain the limits of some known exact solutions. It is shown that these limits may not correspond to similar solutions in the general relativity theory. |
0805.2385 | Kazuhiro Yamamoto | K Yamamoto, T Uchiyama, S Miyoki, M Ohashi, K Kuroda, K Numata | Parametric instabilities in the LCGT arm cavity | 6 pages,3 figures. Amaldi7 proceedings, J. Phys.: Conf. Ser.
(accepted) | J.Phys.Conf.Ser.122:012015,2008 | 10.1088/1742-6596/122/1/012015 | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluated the parametric instabilities of LCGT (Japanese interferometric
gravitational wave detector project) arm cavity. The number of unstable modes
of LCGT is 10-times smaller than that of Advanced LIGO (U.S.A.). Since the
strength of the instabilities of LCGT depends on the mirror curvature more
weakly than th... | [
{
"created": "Thu, 15 May 2008 19:29:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Yamamoto",
"K",
""
],
[
"Uchiyama",
"T",
""
],
[
"Miyoki",
"S",
""
],
[
"Ohashi",
"M",
""
],
[
"Kuroda",
"K",
""
],
[
"Numata",
"K",
""
]
] | We evaluated the parametric instabilities of LCGT (Japanese interferometric gravitational wave detector project) arm cavity. The number of unstable modes of LCGT is 10-times smaller than that of Advanced LIGO (U.S.A.). Since the strength of the instabilities of LCGT depends on the mirror curvature more weakly than that... |
gr-qc/0002045 | Lars Samuelsson | M. Karlovini, K. Rosquist, and L. Samuelsson | Compact stellar objects with multiple neck optical geometries | 4 pages, 6 figures | Annalen Phys.9SI:149,2000 | null | null | gr-qc | null | Ultra compact stellar models with a two-zone uniform density equation of
state are considered. They are shown to provide neat examples of optical
geometries exhibiting double necks, implying that the gravitational wave
potential has a double well structure.
| [
{
"created": "Mon, 14 Feb 2000 17:22:12 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Karlovini",
"M.",
""
],
[
"Rosquist",
"K.",
""
],
[
"Samuelsson",
"L.",
""
]
] | Ultra compact stellar models with a two-zone uniform density equation of state are considered. They are shown to provide neat examples of optical geometries exhibiting double necks, implying that the gravitational wave potential has a double well structure. |
0711.0524 | Mohammad Reza Setare | M R Setare | Interacting generalized Chaplygin gas model in non-flat universe | 8 pages, no figure | Eur.Phys.J.C52:689-692,2007 | 10.1140/epjc/s10052-007-0405-5 | null | gr-qc | null | We employ the generalized Chaplygin gas of interacting dark energy to obtain
the equation of state for the generalized Chaplygin gas energy density in
non-flat universe. By choosing a negative value for $B$ we see that $w_{\rm
\Lambda}^{eff}< -1$, that corresponds to a universe dominated by phantom dark
energy.
| [
{
"created": "Sun, 4 Nov 2007 14:46:50 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Setare",
"M R",
""
]
] | We employ the generalized Chaplygin gas of interacting dark energy to obtain the equation of state for the generalized Chaplygin gas energy density in non-flat universe. By choosing a negative value for $B$ we see that $w_{\rm \Lambda}^{eff}< -1$, that corresponds to a universe dominated by phantom dark energy. |
2308.15682 | Ramin G. Daghigh | Ramin G. Daghigh and Gabor Kunstatter | Who knows what dark matter lurks in the heart of M87: The shadow knows,
and so does the ringdown | 22 pages, 10 figures, regular article, we have made corrections and
added a new section | null | null | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | We calculate the effect of dark matter on the ringdown waveform and shadow of
supermassive black holes at the core of galaxies. Our main focus is on the
supermassive black hole at the core of M87, which is large enough to allow for
viable observational data. We compare the effects of a dark matter spike to
those expe... | [
{
"created": "Wed, 30 Aug 2023 00:43:44 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jan 2024 21:45:21 GMT",
"version": "v2"
}
] | 2024-02-08 | [
[
"Daghigh",
"Ramin G.",
""
],
[
"Kunstatter",
"Gabor",
""
]
] | We calculate the effect of dark matter on the ringdown waveform and shadow of supermassive black holes at the core of galaxies. Our main focus is on the supermassive black hole at the core of M87, which is large enough to allow for viable observational data. We compare the effects of a dark matter spike to those expect... |
2302.09690 | Emil Mottola | Emil Mottola | Gravitational Vacuum Condensate Stars | Review article published as Chapter 8, pp. 283-352 in "Regular Black
Holes: Towards a New Paradigm of Gravitational Collapse," C. Bambi editor
(Springer), 69 pages, 8 figures, Typos fixed, References added and updated | null | 10.1007/978-981-99-1596-5_8 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Gravitational vacuum condensate stars, proposed as the endpoint of
gravitational collapse consistent with quantum theory, are reviewed. Gravastars
are cold, low entropy, maximally compact objects characterized by a surface
boundary layer and physical surface tension instead of an event horizon. Within
this thin bound... | [
{
"created": "Sun, 19 Feb 2023 23:09:03 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Nov 2023 19:56:24 GMT",
"version": "v2"
}
] | 2023-11-28 | [
[
"Mottola",
"Emil",
""
]
] | Gravitational vacuum condensate stars, proposed as the endpoint of gravitational collapse consistent with quantum theory, are reviewed. Gravastars are cold, low entropy, maximally compact objects characterized by a surface boundary layer and physical surface tension instead of an event horizon. Within this thin boundar... |
1412.5002 | Sebasti\~ao Mauro Filho | Sebasti\~ao Mauro and Ilya L. Shapiro | Anomaly-induced effective action and Chern-Simons modification of
general relativity | 15 pages, LaTeX, no Figures. Two references added, correction in the
Acknowledgements. Fits the manuscript accepted in Physics Letters B | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently it was shown that the quantum vacuum effects of massless chiral
fermion field in curved space-time leads to the parity-violating Pontryagin
density term, which appears in the trace anomaly with imaginary coefficient. In
the present work the anomaly-induced effective action with the parity-violating
term is d... | [
{
"created": "Tue, 16 Dec 2014 14:04:13 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 2014 19:57:08 GMT",
"version": "v2"
},
{
"created": "Wed, 20 May 2015 11:46:57 GMT",
"version": "v3"
}
] | 2015-05-21 | [
[
"Mauro",
"Sebastião",
""
],
[
"Shapiro",
"Ilya L.",
""
]
] | Recently it was shown that the quantum vacuum effects of massless chiral fermion field in curved space-time leads to the parity-violating Pontryagin density term, which appears in the trace anomaly with imaginary coefficient. In the present work the anomaly-induced effective action with the parity-violating term is der... |
2207.14244 | Jose Jovel | Norman Cruz, Esteban Gonz\'alez, and Jose Jovel | A non-singular early-time viscous cosmological model | 12 pages, 5 figures. arXiv admin note: text overlap with
arXiv:2202.02362, some typos corrected | Modern Physics Letters AVol. 38, No. 18n19, 2350088 (2023) | 10.1142/S0217732323500888 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the thermodynamical and mathematical consistencies
for a non-singular early-time viscous cosmological model known as soft-Big
Bang, which was previously found in [N. Cruz, E. Gonz\'alez, and J. Jovel,
Phys. Rev. D \textbf{105}, 024047 (2022)]. This model represents a flat
homogeneous and isotr... | [
{
"created": "Thu, 28 Jul 2022 17:23:03 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jul 2022 14:49:24 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Oct 2023 00:48:17 GMT",
"version": "v3"
}
] | 2023-10-12 | [
[
"Cruz",
"Norman",
""
],
[
"González",
"Esteban",
""
],
[
"Jovel",
"Jose",
""
]
] | In this paper, we study the thermodynamical and mathematical consistencies for a non-singular early-time viscous cosmological model known as soft-Big Bang, which was previously found in [N. Cruz, E. Gonz\'alez, and J. Jovel, Phys. Rev. D \textbf{105}, 024047 (2022)]. This model represents a flat homogeneous and isotrop... |
1503.07858 | Muhammad Sharif | M. Sharif and Rubab Manzoor | Instability Analysis of Cylindrical Stellar Object in Brans-Dicke
Gravity | 20 pages, no figure | J. Exp. Theor. Phys. 122(2016)849-858 | 10.1134/S1063776116040075 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates instability ranges of a cylindrically symmetric
collapsing stellar object in Brans-Dicke theory of gravity. For this purpose,
we use perturbation approach in the modified field equations as well as
dynamical equations and construct a collapse equation. The collapse equation
with adiabatic inde... | [
{
"created": "Fri, 27 Mar 2015 07:36:30 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2016 02:23:06 GMT",
"version": "v2"
}
] | 2016-07-20 | [
[
"Sharif",
"M.",
""
],
[
"Manzoor",
"Rubab",
""
]
] | This paper investigates instability ranges of a cylindrically symmetric collapsing stellar object in Brans-Dicke theory of gravity. For this purpose, we use perturbation approach in the modified field equations as well as dynamical equations and construct a collapse equation. The collapse equation with adiabatic index ... |
gr-qc/0412112 | Spiros Cotsakis | Spiros Cotsakis | Slice Energy and Conformal Frames in Theories of Gravitation | 12 pages, latex | null | null | null | gr-qc | null | We examine and compare the behaviour of the scalar field slice energy in
different classes of theories of gravity, in particular higher-order and
scalar-tensor theories. We find a universal formula for the energy and compare
the resulting conservation laws with those known in general relativity. This
leads to a compa... | [
{
"created": "Wed, 22 Dec 2004 10:13:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cotsakis",
"Spiros",
""
]
] | We examine and compare the behaviour of the scalar field slice energy in different classes of theories of gravity, in particular higher-order and scalar-tensor theories. We find a universal formula for the energy and compare the resulting conservation laws with those known in general relativity. This leads to a compari... |
2401.09182 | Zheng-Wen Long | Dong Liu, Yi Yang, Zheng-Wen Long | Probing black holes in a dark matter spike of M87 using quasinormal
modes | null | Eur. Phys. J. C 84, 731 (2024) | 10.1140/epjc/s10052-024-13096-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter density can be significantly enhanced by the supermassive black
hole at the galactic center, leading to a structure called dark matter spike.
Dark matter spike may change the spacetime properties of black holes that
constitute deviations from GR black holes. Based on these interesting
background, we const... | [
{
"created": "Wed, 17 Jan 2024 12:47:45 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 2024 02:47:01 GMT",
"version": "v2"
}
] | 2024-07-29 | [
[
"Liu",
"Dong",
""
],
[
"Yang",
"Yi",
""
],
[
"Long",
"Zheng-Wen",
""
]
] | Dark matter density can be significantly enhanced by the supermassive black hole at the galactic center, leading to a structure called dark matter spike. Dark matter spike may change the spacetime properties of black holes that constitute deviations from GR black holes. Based on these interesting background, we constru... |
2101.04681 | Duvier Suarez Fontanella | D.S. Fontanella and A. Cabo | A stability analysis of the static EKG Boson Stars | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stability of the recently proposed static solutions for boson stars is
analyzed. These solutions of Einstein-Klein-Gordon (EKG) equations arise from
considering the interaction of a real scalar field with matter. We assume that
the inclusion of the scalar field in addition with matter, allows to justify
that stab... | [
{
"created": "Tue, 12 Jan 2021 16:28:17 GMT",
"version": "v1"
}
] | 2021-01-14 | [
[
"Fontanella",
"D. S.",
""
],
[
"Cabo",
"A.",
""
]
] | The stability of the recently proposed static solutions for boson stars is analyzed. These solutions of Einstein-Klein-Gordon (EKG) equations arise from considering the interaction of a real scalar field with matter. We assume that the inclusion of the scalar field in addition with matter, allows to justify that stabil... |
1805.11053 | C L Ahmed Rizwan | C.L. Ahmed Rizwan, A. Naveena Kumara, Deepak Vaid, and K.M. Ajith | Joule-Thomson expansion in AdS black hole with a global monopole | Contains 19 pages,19 figures | International Journal of Modern Physics A, Vol. 33, No. 35,
1850210 (2018) | 10.1142/S0217751X1850210X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the Joule Thomson effects for AdS black holes
with a global monopole. We study the effect of the global monopole parameter
{\eta} on the inversion temperature and isenthalpic curves. The obtained result
is compared with Joule Thomson expansion of van der Waals fluid and the
equivalence w... | [
{
"created": "Thu, 24 May 2018 22:45:23 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Feb 2019 02:25:46 GMT",
"version": "v2"
}
] | 2019-02-14 | [
[
"Rizwan",
"C. L. Ahmed",
""
],
[
"Kumara",
"A. Naveena",
""
],
[
"Vaid",
"Deepak",
""
],
[
"Ajith",
"K. M.",
""
]
] | In this paper, we investigate the Joule Thomson effects for AdS black holes with a global monopole. We study the effect of the global monopole parameter {\eta} on the inversion temperature and isenthalpic curves. The obtained result is compared with Joule Thomson expansion of van der Waals fluid and the equivalence wer... |
1803.08618 | Sandipan Sengupta | Sandipan Sengupta | Geometry of Two-Sheeted Spacetime Solutions | Revised version; Typos in the text and equations corrected; Title
changed | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In contrast to Einstein's theory, the first order formulation of gravity
turns out to be a natural habitat for double-sheeted spacetime solutions which
satisfy the vacuum field equations everywhere. These bridge-like geometries
exhibit degenerate tetrads at their core that separates the two sheets. Here we
study the ... | [
{
"created": "Fri, 23 Mar 2018 00:25:11 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2018 01:01:27 GMT",
"version": "v2"
}
] | 2018-06-29 | [
[
"Sengupta",
"Sandipan",
""
]
] | In contrast to Einstein's theory, the first order formulation of gravity turns out to be a natural habitat for double-sheeted spacetime solutions which satisfy the vacuum field equations everywhere. These bridge-like geometries exhibit degenerate tetrads at their core that separates the two sheets. Here we study the ge... |
2011.04649 | Subenoy Chakraborty | Akash Bose and Subenoy Chakraborty | Does emergent scenario in Ho\v{r}ava-Lifshitz Gravity demand a ghost
field? | 3 figures | Physics of the Dark Universe 30 (2020) 100740 | 10.1016/j.dark.2020.100740 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The non-singular model of the Universe i.e. emergent scenario is now very
well known in cosmology. In Einstein gravity such type of singularity free
solution is possible in the context of non-equilibrium thermodynamical
prescription (both in first and 2nd order theory) with particle creation
mechanism. Also there are... | [
{
"created": "Sun, 8 Nov 2020 08:11:14 GMT",
"version": "v1"
}
] | 2020-11-11 | [
[
"Bose",
"Akash",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The non-singular model of the Universe i.e. emergent scenario is now very well known in cosmology. In Einstein gravity such type of singularity free solution is possible in the context of non-equilibrium thermodynamical prescription (both in first and 2nd order theory) with particle creation mechanism. Also there are v... |
2112.01013 | Bivudutta Mishra Dr. | A.S. Agrawal, B.Mishra, Francisco Tello-Ortiz, A. Alvarez | f(R) wormholes embedded in a pseudo--Euclidean space $E^{5}$ | 20 pages, 21 figures | Fortschr. Phys. 2022, 70, 2100177 | 10.1002/prop.202100177 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is devoted to the study of analytic wormhole solutions within the
framework of $f(R)$ gravity theory. To check the possibility of having wormhole
structures satisfying energy conditions, by means of the class I approach the
pair $\{\Phi(r), b(r)\}$ describing the wormhole geometry has been obtained.
Then, i... | [
{
"created": "Thu, 2 Dec 2021 06:55:09 GMT",
"version": "v1"
},
{
"created": "Sat, 28 May 2022 04:57:28 GMT",
"version": "v2"
}
] | 2022-06-09 | [
[
"Agrawal",
"A. S.",
""
],
[
"Mishra",
"B.",
""
],
[
"Tello-Ortiz",
"Francisco",
""
],
[
"Alvarez",
"A.",
""
]
] | This work is devoted to the study of analytic wormhole solutions within the framework of $f(R)$ gravity theory. To check the possibility of having wormhole structures satisfying energy conditions, by means of the class I approach the pair $\{\Phi(r), b(r)\}$ describing the wormhole geometry has been obtained. Then, in ... |
gr-qc/0610149 | Petarpa Boonserm | Petarpa Boonserm | Some exact solutions in general relativity | Master's thesis: 161 pages, 13 figures, 6 tables | null | null | null | gr-qc | null | In this thesis four separate problems in general relativity are considered,
divided into two separate themes: coordinate conditions and perfect fluid
spheres. Regarding coordinate conditions we present a pedagogical discussion of
how the appropriate use of coordinate conditions can lead to simplifications in
the form... | [
{
"created": "Mon, 30 Oct 2006 01:21:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Boonserm",
"Petarpa",
""
]
] | In this thesis four separate problems in general relativity are considered, divided into two separate themes: coordinate conditions and perfect fluid spheres. Regarding coordinate conditions we present a pedagogical discussion of how the appropriate use of coordinate conditions can lead to simplifications in the form o... |
0807.3066 | Tiberiu Harko | Giuseppe De Risi, Tiberiu Harko, Francisco S. N. Lobo, Chun Shing
Jason Pun | Quark-Hadron Phase Transitions in Brane-World Cosmologies | 13 pages, 8 figures, accepted for publication in Nucl. Phys. B | Nucl.Phys.B805:190-206,2008 | 10.1016/j.nuclphysb.2008.07.012 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When the universe was about 10 $\mu $seconds old, a first order cosmological
quark - hadron phase transition occurred at a critical temperature of around
200 MeV. In this work, we study the quark-hadron phase transition in the
context of brane-world cosmologies, in which our Universe is a three-brane
embedded in a fi... | [
{
"created": "Sat, 19 Jul 2008 05:42:59 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"De Risi",
"Giuseppe",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Pun",
"Chun Shing Jason",
""
]
] | When the universe was about 10 $\mu $seconds old, a first order cosmological quark - hadron phase transition occurred at a critical temperature of around 200 MeV. In this work, we study the quark-hadron phase transition in the context of brane-world cosmologies, in which our Universe is a three-brane embedded in a five... |
0810.4393 | Anatoly Logunov | S. S. Gershtein, A. A.Logunov and M. A. Mestvirishvili | Gravitational Waves in Relativistic Theory of Gravitation | 4 pages | null | 10.1007/s11232-009-0102-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that, in the framework of Relativistic Theory of Gravitation with
massive graviton, gravitational waves, due to the causality condition, do not
bear negative energy flows.
| [
{
"created": "Fri, 24 Oct 2008 07:41:31 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jan 2009 09:26:44 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Gershtein",
"S. S.",
""
],
[
"Logunov",
"A. A.",
""
],
[
"Mestvirishvili",
"M. A.",
""
]
] | It is shown that, in the framework of Relativistic Theory of Gravitation with massive graviton, gravitational waves, due to the causality condition, do not bear negative energy flows. |
2111.09677 | Antonio Racioppi | Antonio Racioppi, Martin Vasar | On the number of $e$-folds in the Jordan and Einstein frames | 21 pages, 4 figures, matches the published version | Eur.Phys.J.Plus 137 (2022) 5, 637 | 10.1140/epjp/s13360-022-02853-x | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate how inflationary predictions are affected by the difference in
the number of $e$-folds between the Jordan and Einstein frames. We study
several test models in relation to a Jordan frame defined by the common
Higgs-inflation-like non-minimal coupling to gravity and consider two different
formulations of... | [
{
"created": "Thu, 18 Nov 2021 13:27:58 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2022 12:14:42 GMT",
"version": "v2"
}
] | 2022-06-02 | [
[
"Racioppi",
"Antonio",
""
],
[
"Vasar",
"Martin",
""
]
] | We investigate how inflationary predictions are affected by the difference in the number of $e$-folds between the Jordan and Einstein frames. We study several test models in relation to a Jordan frame defined by the common Higgs-inflation-like non-minimal coupling to gravity and consider two different formulations of g... |
2311.18770 | Juan M. Z\'arate Pretel | Juan M. Z. Pretel, Takol Tangphati, Ayan Banerjee and Anirudh Pradhan | Effects of anisotropic pressure on interacting quark star structure | 17 pages, 17 figures and 1 table. To appear in Physics Letters B | Phys. Lett. B 848 (2024) 138375 | 10.1016/j.physletb.2023.138375 | null | gr-qc astro-ph.SR nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Perturbative Quantum Chromodynamics (pQCD) corrections and color
superconductivity predict that strongly interacting matter can reveal new
physical phenomena under extreme conditions. Taking into account these
interaction effects, we investigate the role of anisotropic pressure in quark
stars composed of interacting ... | [
{
"created": "Thu, 30 Nov 2023 18:08:55 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2023 06:42:16 GMT",
"version": "v2"
}
] | 2023-12-15 | [
[
"Pretel",
"Juan M. Z.",
""
],
[
"Tangphati",
"Takol",
""
],
[
"Banerjee",
"Ayan",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | Perturbative Quantum Chromodynamics (pQCD) corrections and color superconductivity predict that strongly interacting matter can reveal new physical phenomena under extreme conditions. Taking into account these interaction effects, we investigate the role of anisotropic pressure in quark stars composed of interacting qu... |
2008.02738 | Yotam Sherf | Ram Brustein, Yotam Sherf | Quantum Love | Replaced to agree with the published PRD version | null | 10.1103/PhysRevD.105.024043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The response of a gravitating object to an external tidal field is encoded in
its Love numbers, which identically vanish for classical blackholes (BHs). Here
we show, using standard time-independent quantum perturbation theory, that for
a quantum BH, generically, the Love numbers are nonvanishing and negative, and
th... | [
{
"created": "Thu, 6 Aug 2020 16:08:44 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jan 2022 17:45:47 GMT",
"version": "v2"
}
] | 2022-01-20 | [
[
"Brustein",
"Ram",
""
],
[
"Sherf",
"Yotam",
""
]
] | The response of a gravitating object to an external tidal field is encoded in its Love numbers, which identically vanish for classical blackholes (BHs). Here we show, using standard time-independent quantum perturbation theory, that for a quantum BH, generically, the Love numbers are nonvanishing and negative, and that... |
1901.05171 | I\~naki Garay | I\~naki Garay, Salvador Robles-P\'erez | Classical geodesics from the canonical quantisation of spacetime
coordinates | 9 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A canonical quantisation of the coordinates of the spacetime within the
general relativity theory is proposed. This quantisation will depend on the
observer but it provides an interesting perspective on the problem of relating
the non-relativistic and classical limits of a possible quantum gravity theory.
In this sen... | [
{
"created": "Wed, 16 Jan 2019 08:18:32 GMT",
"version": "v1"
}
] | 2019-01-17 | [
[
"Garay",
"Iñaki",
""
],
[
"Robles-Pérez",
"Salvador",
""
]
] | A canonical quantisation of the coordinates of the spacetime within the general relativity theory is proposed. This quantisation will depend on the observer but it provides an interesting perspective on the problem of relating the non-relativistic and classical limits of a possible quantum gravity theory. In this sense... |
gr-qc/0702096 | Linqing Wen | Linqing Wen (MPI/AEI) | Data Analysis of Gravitational Waves Using A Network of Detectors | to appear in IJMPD, 2007, for the ASTROD meeting, July, 2006,
Beijing. Minor changes with new references added to sec. 3.1 | Int.J.Mod.Phys.D17:1095-1104,2008 | 10.1142/S0218271808012723 | LIGO-P070012-00-Z | gr-qc | null | Several large-scale gravitational wave (GW) interferometers have achieved
long term operation at design sensitivity. Questions arise on how to best
combine all available data from detectors of different sensitivities for
detection, consistency check or veto, localization and waveform extraction. We
show that these pr... | [
{
"created": "Fri, 16 Feb 2007 08:54:37 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Mar 2007 09:53:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wen",
"Linqing",
"",
"MPI/AEI"
]
] | Several large-scale gravitational wave (GW) interferometers have achieved long term operation at design sensitivity. Questions arise on how to best combine all available data from detectors of different sensitivities for detection, consistency check or veto, localization and waveform extraction. We show that these prob... |
gr-qc/0503112 | Alan D. Rendall | Alan D. Rendall | The nature of spacetime singularities | Submitted to 100 Years of Relativity - Space-Time Structure: Einstein
and Beyond, A. Ashtekar (ed.) | null | 10.1142/9789812700988_0003 | AEI-2005-046 | gr-qc | null | Present knowledge about the nature of spacetime singularities in the context
of classical general relativity is surveyed. The status of the BKL picture of
cosmological singularities and its relevance to the cosmic censorship
hypothesis are discussed. It is shown how insights on cosmic censorship also
arise in connect... | [
{
"created": "Tue, 29 Mar 2005 13:39:00 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Rendall",
"Alan D.",
""
]
] | Present knowledge about the nature of spacetime singularities in the context of classical general relativity is surveyed. The status of the BKL picture of cosmological singularities and its relevance to the cosmic censorship hypothesis are discussed. It is shown how insights on cosmic censorship also arise in connectio... |
1007.5427 | Valerio Faraoni | Ivana Bochicchio (University of Salerno) and Valerio Faraoni (Bishop's
University) | A Lemaitre-Tolman-Bondi cosmological wormhole | 5 pages, latex, no figures, to appear in Phys. Rev. D | Phys.Rev.D82:044040,2010 | 10.1103/PhysRevD.82.044040 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new analytical solution of the Einstein field equations
describing a wormhole shell of zero thickness joining two
Lema{\i}tre-Tolman-Bondi universes, with no radial accretion. The material on
the shell satisfies the energy conditions and, at late times, the shell becomes
comoving with the dust-dominated ... | [
{
"created": "Fri, 30 Jul 2010 12:26:51 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Bochicchio",
"Ivana",
"",
"University of Salerno"
],
[
"Faraoni",
"Valerio",
"",
"Bishop's\n University"
]
] | We present a new analytical solution of the Einstein field equations describing a wormhole shell of zero thickness joining two Lema{\i}tre-Tolman-Bondi universes, with no radial accretion. The material on the shell satisfies the energy conditions and, at late times, the shell becomes comoving with the dust-dominated co... |
1512.05571 | Tayeb Golanbari | Z. Ossoulian, T. Golanbari, H. Sheikhahmadi, and Kh. Saaidi | Stability of a noncanonical scalar field model during cosmological date | 12 pages, 2 figures, Accepted in Advances in High Energy Physics | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the non-canonical model of scalar field, the cosmological consequences
of a pervasive, self-interacting, homogeneous and rolling scalar field are
studied. In this model, the scalar field potential is nonlinear and decreases
in magnitude with increasing the value of the scalar field. A special solution
of the no... | [
{
"created": "Thu, 17 Dec 2015 13:09:16 GMT",
"version": "v1"
}
] | 2015-12-18 | [
[
"Ossoulian",
"Z.",
""
],
[
"Golanbari",
"T.",
""
],
[
"Sheikhahmadi",
"H.",
""
],
[
"Saaidi",
"Kh.",
""
]
] | Using the non-canonical model of scalar field, the cosmological consequences of a pervasive, self-interacting, homogeneous and rolling scalar field are studied. In this model, the scalar field potential is nonlinear and decreases in magnitude with increasing the value of the scalar field. A special solution of the nonl... |
0910.5787 | Muhammad Sharif | M. Sharif and M. Farasat Shamir | Exact Solutions of Bianchi Types $I$ and $V$ Spacetimes in $f(R)$ Theory
of Gravity | 16 pages, accepted for publication in Class. Quantum Grav | Class.Quant.Grav.26:235020,2009 | 10.1088/0264-9381/26/23/235020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the crucial phenomenon of the expansion of the universe has
been discussed. For this purpose, we study the vacuum solutions of Bianchi
types $I$ and $V$ spacetimes in the framework of $f(R)$ gravity. In particular,
we find two exact solutions in each case by using the variation law of Hubble
parameter.... | [
{
"created": "Fri, 30 Oct 2009 05:36:11 GMT",
"version": "v1"
}
] | 2010-05-07 | [
[
"Sharif",
"M.",
""
],
[
"Shamir",
"M. Farasat",
""
]
] | In this paper, the crucial phenomenon of the expansion of the universe has been discussed. For this purpose, we study the vacuum solutions of Bianchi types $I$ and $V$ spacetimes in the framework of $f(R)$ gravity. In particular, we find two exact solutions in each case by using the variation law of Hubble parameter. T... |
gr-qc/0606049 | Behrouz Mirza | Behrouz Mirza, Mehdi Eshaghi, Shahram Dehdashti | Lorentzian Wormholes in the Friedman-Robertson-Walker Universe | 7 pages | Int.J.Mod.Phys. D15 (2006) 1217-1223 | 10.1142/S0218271806008851 | null | gr-qc | null | The metric of some Lorentzian wormholes in the background of the FRW universe
is obtained. It is shown that for a de Sitter space-time the new solution is
supported by Phantom Energy. The wave equation for a scalar field in such
backgrounds is separable. The form of the potential for the Schr\"{o}dinger
type one dime... | [
{
"created": "Mon, 12 Jun 2006 06:55:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mirza",
"Behrouz",
""
],
[
"Eshaghi",
"Mehdi",
""
],
[
"Dehdashti",
"Shahram",
""
]
] | The metric of some Lorentzian wormholes in the background of the FRW universe is obtained. It is shown that for a de Sitter space-time the new solution is supported by Phantom Energy. The wave equation for a scalar field in such backgrounds is separable. The form of the potential for the Schr\"{o}dinger type one dimens... |
0708.2493 | Rickard Jonsson | Rickard Jonsson | Inertial forces and the foundations of optical geometry | 42 pages, 7 figures | Class.Quant.Grav.23:1-36,2006 | 10.1088/0264-9381/23/1/001 | null | gr-qc | null | Assuming a general timelike congruence of worldlines as a reference frame, we
derive a covariant general formalism of inertial forces in General Relativity.
Inspired by the works of Abramowicz et. al. (see e.g. Abramowicz and Lasota,
Class. Quantum Grav. 14 (1997) A23), we also study conformal rescalings of
spacetime... | [
{
"created": "Sun, 19 Aug 2007 10:22:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jonsson",
"Rickard",
""
]
] | Assuming a general timelike congruence of worldlines as a reference frame, we derive a covariant general formalism of inertial forces in General Relativity. Inspired by the works of Abramowicz et. al. (see e.g. Abramowicz and Lasota, Class. Quantum Grav. 14 (1997) A23), we also study conformal rescalings of spacetime a... |
2105.02894 | Adriano Vigan\`o | Marco Astorino, Adriano Vigan\`o | Charged and rotating multi-black holes in an external gravitational
field | 22 pages, 4 figures. v2: Mathematica worksheet included in the arXiv
files, typos corrected, references added | Eur.Phys.J.C 82 (2022) 9, 829 | 10.1140/epjc/s10052-022-10787-y | IFUM-1091-FT | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We construct analytical and regular solutions in four-dimensional General
Relativity which represent multi-black hole systems immersed in external
gravitational field configurations. The external field background is composed
by an infinite multipolar expansion, which allows to regularise the conical
singularities of ... | [
{
"created": "Thu, 6 May 2021 18:00:12 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 2021 15:04:24 GMT",
"version": "v2"
}
] | 2023-08-22 | [
[
"Astorino",
"Marco",
""
],
[
"Viganò",
"Adriano",
""
]
] | We construct analytical and regular solutions in four-dimensional General Relativity which represent multi-black hole systems immersed in external gravitational field configurations. The external field background is composed by an infinite multipolar expansion, which allows to regularise the conical singularities of an... |
1807.05940 | Rodrigo Panosso Macedo | Rodrigo Panosso Macedo | Comment on "Some exact quasinormal frequencies of a massless scalar
field in Schwarzschild spacetime" | 6 pages, 2 figures. Comment on gr-qc:1807.04513. Match published
version | Phys. Rev. D 99, 088501 (2019) | 10.1103/PhysRevD.99.088501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new branch of quasinormal modes for a massless scalar field propagating on
the Schwarzschild spacetime was recently announced [1807.04513]. We review the
quasinormal modes characterisation and arguments and identify the flaws in
their proof. Then, we preset explicit counterexamples to such arguments.
Finally, we st... | [
{
"created": "Mon, 16 Jul 2018 16:02:15 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Sep 2018 16:41:25 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Apr 2019 15:02:44 GMT",
"version": "v3"
}
] | 2019-04-24 | [
[
"Macedo",
"Rodrigo Panosso",
""
]
] | A new branch of quasinormal modes for a massless scalar field propagating on the Schwarzschild spacetime was recently announced [1807.04513]. We review the quasinormal modes characterisation and arguments and identify the flaws in their proof. Then, we preset explicit counterexamples to such arguments. Finally, we stud... |
1505.03830 | Sourya Ray | Sourya Ray | Birkhoff's Theorem in Lovelock Gravity for General Base Manifolds | minor corrections, matches the published version | Class. Quantum Grav. 32 (2015) 195022 | 10.1088/0264-9381/32/19/195022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the Birkhoff's theorem in Lovelock gravity for arbitrary base
manifolds using an elementary method. In particular, it is shown that any
solution of the form of a warped product of a two-dimensional transverse space
and an arbitrary base manifold must be static. Moreover, the field equations
restrict the bas... | [
{
"created": "Thu, 14 May 2015 18:46:39 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2015 18:27:31 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Sep 2015 14:12:46 GMT",
"version": "v3"
}
] | 2015-09-21 | [
[
"Ray",
"Sourya",
""
]
] | We extend the Birkhoff's theorem in Lovelock gravity for arbitrary base manifolds using an elementary method. In particular, it is shown that any solution of the form of a warped product of a two-dimensional transverse space and an arbitrary base manifold must be static. Moreover, the field equations restrict the base ... |
1704.03450 | Alberto Diez-Tejedor | Juan Barranco, Argelia Bernal, Juan Carlos Degollado, Alberto
Diez-Tejedor, Miguel Megevand, Dario Nunez, Olivier Sarbach | Self-gravitating black hole scalar wigs | 20 pages, 12 figures, 1 table | Phys. Rev. D 96, 024049 (2017) | 10.1103/PhysRevD.96.024049 | null | gr-qc astro-ph.CO astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has long been known that no static, spherically symmetric, asymptotically
flat Klein-Gordon scalar field configuration surrounding a nonrotating black
hole can exist in general relativity. In a series of previous papers we proved
that, at the effective level, this no-hair theorem can be circumvented by
relaxing th... | [
{
"created": "Tue, 11 Apr 2017 17:56:33 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Barranco",
"Juan",
""
],
[
"Bernal",
"Argelia",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Diez-Tejedor",
"Alberto",
""
],
[
"Megevand",
"Miguel",
""
],
[
"Nunez",
"Dario",
""
],
[
"Sarbach",
"Olivier",
... | It has long been known that no static, spherically symmetric, asymptotically flat Klein-Gordon scalar field configuration surrounding a nonrotating black hole can exist in general relativity. In a series of previous papers we proved that, at the effective level, this no-hair theorem can be circumvented by relaxing the ... |
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