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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0808.2379 | Ujjal Debnath | Ujjal Debnath | Emergent Universe and Phantom Tachyon Model | 7 Latex pages, 7 figures, RevTex style | Class.Quant.Grav.25:205019,2008 | 10.1088/0264-9381/25/20/205019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, I have considered that the universe is filled with normal
matter and phantom field (or tachyonic field). If the universe is filled with
scalar field, Ellis et al have shown that emergent scenario is possible only
for $k=+1$ i.e. for closed universe and here I have shown that the emergent
scenario is pos... | [
{
"created": "Mon, 18 Aug 2008 12:35:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Debnath",
"Ujjal",
""
]
] | In this work, I have considered that the universe is filled with normal matter and phantom field (or tachyonic field). If the universe is filled with scalar field, Ellis et al have shown that emergent scenario is possible only for $k=+1$ i.e. for closed universe and here I have shown that the emergent scenario is possi... |
1005.3009 | Krzysztof Bolejko | Krzysztof Bolejko, William R. Stoeger | Conditions for spontaneous homogenization of the Universe | 7 pages. Fifth Award in the 2010 Gravity Research Foundation essay
competition | Gen.Rel.Grav.42:2349-2356,2010 | 10.1007/s10714-010-1020-6 10.1142/S0218271810018566 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present-day Universe appears to be homogeneous on very large scales. Yet
when the casual structure of the early Universe is considered, it becomes
apparent that the early Universe must have been highly inhomogeneous. The
current paradigm attempts to answer this problem by postulating the inflation
mechanism Howev... | [
{
"created": "Mon, 17 May 2010 19:48:48 GMT",
"version": "v1"
}
] | 2011-03-04 | [
[
"Bolejko",
"Krzysztof",
""
],
[
"Stoeger",
"William R.",
""
]
] | The present-day Universe appears to be homogeneous on very large scales. Yet when the casual structure of the early Universe is considered, it becomes apparent that the early Universe must have been highly inhomogeneous. The current paradigm attempts to answer this problem by postulating the inflation mechanism However... |
0807.3226 | Yun-Song Piao | Yun-Song Piao | On Primordial Density Perturbation and Decaying Speed of Sound | 3 pages, 2 eps figure, contents extended, refs. added, published
version, | Phys.Rev.D79:067301,2009 | 10.1103/PhysRevD.79.067301 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decaying speed of sound can lead to the emergence of the primordial
density perturbation in any expanding phase, even if the expansion is
decelerated. Recently, some proposals have been given to implement this
mechanism, in which it was found that the primordial spectrum of scalar
perturbation can be scale invari... | [
{
"created": "Mon, 21 Jul 2008 09:58:27 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Mar 2009 02:58:09 GMT",
"version": "v2"
}
] | 2009-11-06 | [
[
"Piao",
"Yun-Song",
""
]
] | The decaying speed of sound can lead to the emergence of the primordial density perturbation in any expanding phase, even if the expansion is decelerated. Recently, some proposals have been given to implement this mechanism, in which it was found that the primordial spectrum of scalar perturbation can be scale invarian... |
2304.07952 | Chen Wu | Zening Yan, Xiaoji Zhang, Maoyuan Wan, and Chen Wu | Shadows and quasinormal modes of a charged non-commutative black hole by
different methods | 25 pages, 12 figures | European Physical Journal Plus (2023) 138:377 | 10.1140/epjp/s13360-023-03978-3 | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | In this paper, we calculated the quasinormal modes (QNMs) of a charged
non-commutative black hole in scalar, electromagnetic and gravitational fields
by three methods. We gave the influence of non-commutative parameter $\theta$
and charge $Q$ on QNMs in different fields. Thereafter, we calculated the
shadow radius of... | [
{
"created": "Mon, 17 Apr 2023 02:34:50 GMT",
"version": "v1"
}
] | 2023-05-12 | [
[
"Yan",
"Zening",
""
],
[
"Zhang",
"Xiaoji",
""
],
[
"Wan",
"Maoyuan",
""
],
[
"Wu",
"Chen",
""
]
] | In this paper, we calculated the quasinormal modes (QNMs) of a charged non-commutative black hole in scalar, electromagnetic and gravitational fields by three methods. We gave the influence of non-commutative parameter $\theta$ and charge $Q$ on QNMs in different fields. Thereafter, we calculated the shadow radius of t... |
2403.04695 | Yuri Pavlov | A. A. Grib, Yu. V. Pavlov | On phase transitions during collisions near the horizon of black holes | 12 pages | Universe 2024, 10, 131 | 10.3390/universe10030131 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During particle collisions in the vicinity of the horizon of black holes, it
is possible to achieve energies and temperatures corresponding to phase
transitions in particle physics. It is shown that the sizes of the regions of
the new phase are of the order of the Compton length for the corresponding mass
scale. The ... | [
{
"created": "Thu, 7 Mar 2024 17:44:07 GMT",
"version": "v1"
}
] | 2024-03-08 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | During particle collisions in the vicinity of the horizon of black holes, it is possible to achieve energies and temperatures corresponding to phase transitions in particle physics. It is shown that the sizes of the regions of the new phase are of the order of the Compton length for the corresponding mass scale. The li... |
gr-qc/0005096 | Joseph Samuel | Joseph Samuel and Rajaram Nityananda | Transport along Null Curves | Latex 17 pages, no figures | J.Phys.A33:2895,2000 | 10.1088/0305-4470/33/14/318 | null | gr-qc | null | Fermi Transport is useful for describing the behaviour of spins or gyroscopes
following non-geodesic, timelike world lines. However, Fermi Transport breaks
down for null world lines. We introduce a transport law for polarisation
vectors along non-geodesic null curves. We show how this law emerges naturally
from the g... | [
{
"created": "Mon, 22 May 2000 08:41:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Samuel",
"Joseph",
""
],
[
"Nityananda",
"Rajaram",
""
]
] | Fermi Transport is useful for describing the behaviour of spins or gyroscopes following non-geodesic, timelike world lines. However, Fermi Transport breaks down for null world lines. We introduce a transport law for polarisation vectors along non-geodesic null curves. We show how this law emerges naturally from the geo... |
1007.3299 | John Ward | Paulo Vargas Moniz and John Ward | Gauge field back-reaction in Born Infeld cosmologies | 34 pages, 3 figures. Minor clarifications. References added | Class.Quant.Grav.27:235009,2010 | 10.1088/0264-9381/27/23/235009 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the back-reaction of $U(1)$ gauge fields into a
class of inflationary settings. To be more precise, we employ a Bianchi-I
geometry (taken as an anisotropic perturbation of a flat FRW model) within two
types of Born-Infeld theories. Firstly we consider pure Born-Infeld
electromagnetism. F... | [
{
"created": "Mon, 19 Jul 2010 22:27:33 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Aug 2010 17:57:59 GMT",
"version": "v2"
}
] | 2011-03-28 | [
[
"Moniz",
"Paulo Vargas",
""
],
[
"Ward",
"John",
""
]
] | In this paper, we investigate the back-reaction of $U(1)$ gauge fields into a class of inflationary settings. To be more precise, we employ a Bianchi-I geometry (taken as an anisotropic perturbation of a flat FRW model) within two types of Born-Infeld theories. Firstly we consider pure Born-Infeld electromagnetism. For... |
1106.3734 | Daniele Malafarina | Daniele Malafarina and Pankaj S. Joshi | Thermodynamics and gravitational collapse | 8 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known now that a typical gravitational collapse in general relativity,
evolving from regular initial data and under physically reasonable conditions
would end in either a black hole or a naked singularity final state. An
important question that needs to be answered in this connection is, whether the
analogues o... | [
{
"created": "Sun, 19 Jun 2011 11:14:00 GMT",
"version": "v1"
}
] | 2011-06-21 | [
[
"Malafarina",
"Daniele",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | It is known now that a typical gravitational collapse in general relativity, evolving from regular initial data and under physically reasonable conditions would end in either a black hole or a naked singularity final state. An important question that needs to be answered in this connection is, whether the analogues of ... |
gr-qc/0305084 | Matteo Luca Ruggiero | Guido Rizzi, Matteo Luca Ruggiero | The relativistic Sagnac Effect: two derivations | 49 pages, LaTeX, 3 EPS figures. Revised (final) version, minor
corrections; to appear in "Relativity in Rotating Frames", ed. G. Rizzi and
M.L. Ruggiero, Kluwer Academic Publishers, Dordrecht, (2003). See also
http://digilander.libero.it/solciclos | null | null | null | gr-qc | null | The phase shift due to the Sagnac Effect, for relativistic matter and
electromagnetic beams, counter-propagating in a rotating interferometer, is
deduced using two different approaches. From one hand, we show that the
relativistic law of velocity addition leads to the well known Sagnac time
difference, which is the s... | [
{
"created": "Thu, 22 May 2003 10:38:30 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jul 2003 15:34:27 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Sep 2003 13:51:29 GMT",
"version": "v3"
},
{
"created": "Fri, 26 Sep 2003 09:31:16 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Rizzi",
"Guido",
""
],
[
"Ruggiero",
"Matteo Luca",
""
]
] | The phase shift due to the Sagnac Effect, for relativistic matter and electromagnetic beams, counter-propagating in a rotating interferometer, is deduced using two different approaches. From one hand, we show that the relativistic law of velocity addition leads to the well known Sagnac time difference, which is the sam... |
2206.11734 | Nikolaos Mavromatos | Nikos Chatzifotis, Panos Dorlis, Nick E. Mavromatos and Eleftherios
Papantonopoulos | Axion induced angular momentum reversal in Kerr-like black holes | 13 pages revtex, 7 pdf figures incorporated | null | 10.1103/PhysRevD.106.084002 | KCL-PH-TH/2022-37 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a pseudoscalar axion-like field coupled to a Chern-Simons
gravitational anomaly term. The axion field backreacts on a rotating Kerr black
hole background, resulting in modifications in the spacetime. In an attempt to
determine potentially observable signatures, we study the angular momentum of
the system ... | [
{
"created": "Thu, 23 Jun 2022 14:30:08 GMT",
"version": "v1"
}
] | 2022-10-19 | [
[
"Chatzifotis",
"Nikos",
""
],
[
"Dorlis",
"Panos",
""
],
[
"Mavromatos",
"Nick E.",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
]
] | We consider a pseudoscalar axion-like field coupled to a Chern-Simons gravitational anomaly term. The axion field backreacts on a rotating Kerr black hole background, resulting in modifications in the spacetime. In an attempt to determine potentially observable signatures, we study the angular momentum of the system of... |
0712.0683 | Ghanashyam Date | Kinjal Banerjee and Ghanashyam Date | Loop Quantization of Polarized Gowdy Model on $T^3$: Classical Theory | 20 pages, no figures. Final version; to appear in Classical and
Quantum Gravity. Additional References included | Class.Quant.Grav.25:105014,2008 | 10.1088/0264-9381/25/10/105014 | IMSc/2007/12/15 | gr-qc hep-th | null | The vacuum Gowdy models provide much studied, non-trivial midi-superspace
examples. Various technical issues within Loop Quantum Gravity can be studied
in these models as well as one can hope to understand singularities and their
resolution in the loop quantization. The first step in this program is to
reformulate th... | [
{
"created": "Wed, 5 Dec 2007 10:53:38 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Apr 2008 12:31:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Banerjee",
"Kinjal",
""
],
[
"Date",
"Ghanashyam",
""
]
] | The vacuum Gowdy models provide much studied, non-trivial midi-superspace examples. Various technical issues within Loop Quantum Gravity can be studied in these models as well as one can hope to understand singularities and their resolution in the loop quantization. The first step in this program is to reformulate the ... |
1909.08271 | Oscar Alejandro Reula | A. L. Garc\'ia-Perciante and Oscar. Reula | On the illposedness and stability of the relativistic heat equation | 5 pages | null | 10.1063/1.5123393 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we analyze, in terms of a simple example, the incompatibility of
parabolic evolution and general covariance. For this we introduce a unit
time-like four-vector and study the simplest heat flux equation with respect to
it. In cases where this vector field is surface forming then the local high
wave number... | [
{
"created": "Wed, 18 Sep 2019 07:40:19 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"García-Perciante",
"A. L.",
""
],
[
"Reula",
"Oscar.",
""
]
] | In this note we analyze, in terms of a simple example, the incompatibility of parabolic evolution and general covariance. For this we introduce a unit time-like four-vector and study the simplest heat flux equation with respect to it. In cases where this vector field is surface forming then the local high wave number l... |
1701.00134 | Gabriel Farrugia | Gabriel Farrugia and Jackson Levi Said | Stability of the flat FLRW metric in $f(T)$ gravity | 14 pages, 14 figures | Phys. Rev. D 94, 124054 (2016) | 10.1103/PhysRevD.94.124054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the stability of the flat FLRW metric in $f(T)$
gravity. This is achieved by analysing the small perturbations, $\delta$ about
the Hubble parameter and the matter energy density, $\delta_\text{m}$. We find
that $\delta \propto \dot{H}/H$ and $\delta_{\text{m}} \propto H$. Since the
Hubbl... | [
{
"created": "Sat, 31 Dec 2016 16:27:24 GMT",
"version": "v1"
}
] | 2017-01-03 | [
[
"Farrugia",
"Gabriel",
""
],
[
"Said",
"Jackson Levi",
""
]
] | In this paper, we investigate the stability of the flat FLRW metric in $f(T)$ gravity. This is achieved by analysing the small perturbations, $\delta$ about the Hubble parameter and the matter energy density, $\delta_\text{m}$. We find that $\delta \propto \dot{H}/H$ and $\delta_{\text{m}} \propto H$. Since the Hubble ... |
1510.08585 | Lorenzo Iorio | Lorenzo Iorio | The impact of the orbital decay of the LAGEOS satellites on the
frame-dragging tests | LaTex2e, 2 tables, 1 figure, 12 pages. At press in Advances in Space
Research (ASR) | Adv.Space Res.57:493-498,2016 | 10.1016/j.asr.2015.10.014 | null | gr-qc astro-ph.EP physics.geo-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The laser-tracked geodetic satellites LAGEOS, LAGEOS II and LARES are
currently employed, among other things, to measure the general relativistic
Lense-Thirring effect in the gravitomagnetic field of the spinning Earth with
the hope of providing a more accurate test of such a prediction of the
Einstein's theory of gr... | [
{
"created": "Thu, 29 Oct 2015 07:33:26 GMT",
"version": "v1"
}
] | 2015-12-15 | [
[
"Iorio",
"Lorenzo",
""
]
] | The laser-tracked geodetic satellites LAGEOS, LAGEOS II and LARES are currently employed, among other things, to measure the general relativistic Lense-Thirring effect in the gravitomagnetic field of the spinning Earth with the hope of providing a more accurate test of such a prediction of the Einstein's theory of grav... |
1709.07154 | Elias C. Vagenas | Saurya Das, Matthew P. G. Robbins, Elias C. Vagenas | Gravitation as a source of decoherence | 7 pages, REVTeX 4, no figures, to appear in IJMPD | Int. J. Mod. Phys. D 27, No. 01 (2018) 1850008 | 10.1142/S0218271818500086 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is believed that classical behavior emerges in a quantum system due to
decoherence. It has also been proposed that gravity can be a source of this
decoherence. We examine this in detail by studying a number of quantum systems,
including ultra-relativistic and non-relativistic particles, at low and high
temperature... | [
{
"created": "Thu, 21 Sep 2017 04:45:09 GMT",
"version": "v1"
}
] | 2017-10-31 | [
[
"Das",
"Saurya",
""
],
[
"Robbins",
"Matthew P. G.",
""
],
[
"Vagenas",
"Elias C.",
""
]
] | It is believed that classical behavior emerges in a quantum system due to decoherence. It has also been proposed that gravity can be a source of this decoherence. We examine this in detail by studying a number of quantum systems, including ultra-relativistic and non-relativistic particles, at low and high temperatures ... |
1809.02127 | Ilia Musco | Ilia Musco | Threshold for primordial black holes: Dependence on the shape of the
cosmological perturbations | 18 pages, 5 figures. The paper has been selected by Physical Review D
as an Editors' Suggestion | Phys. Rev. D 100, 123524 (2019) | 10.1103/PhysRevD.100.123524 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Primordial black holes may have formed in the radiative era of the early
Universe from the collapse of large enough amplitude perturbations of the
metric. These correspond to non linear energy density perturbations
characterized by an amplitude larger than a certain threshold, measured when
the perturbations reenter ... | [
{
"created": "Thu, 6 Sep 2018 17:58:21 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2019 01:50:33 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jan 2020 18:49:46 GMT",
"version": "v3"
}
] | 2020-01-06 | [
[
"Musco",
"Ilia",
""
]
] | Primordial black holes may have formed in the radiative era of the early Universe from the collapse of large enough amplitude perturbations of the metric. These correspond to non linear energy density perturbations characterized by an amplitude larger than a certain threshold, measured when the perturbations reenter th... |
gr-qc/0101057 | Rodolfo Gambini | Rodolfo Gambini and Rafael A. Porto | Relational time in generally covariant quantum systems: four models | 18 pages, revtex file | Phys.Rev. D63 (2001) 105014 | 10.1103/PhysRevD.63.105014 | IFFC-01-01 | gr-qc | null | We analize the relational quantum evolution of generally covariant systems in
terms of Rovelli's evolving constants of motion and the generalized Heisenberg
picture. In order to have a well defined evolution, and a consistent quantum
theory, evolving constants must be self-adjoint operators. We show that this
conditi... | [
{
"created": "Mon, 15 Jan 2001 13:30:10 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Porto",
"Rafael A.",
""
]
] | We analize the relational quantum evolution of generally covariant systems in terms of Rovelli's evolving constants of motion and the generalized Heisenberg picture. In order to have a well defined evolution, and a consistent quantum theory, evolving constants must be self-adjoint operators. We show that this condition... |
gr-qc/9806011 | Heller Michal | M. Heller (Vatican Observatory), W. Sasin (Institute of Mathematics,
Warsaw University of Technology) | Einstein-Podolski-Rosen Experiment from Noncommutative Quantum Gravity | 11 pages, latex, no figures | Particles, Fields, and Gravitation, American Institute of Physics,
1998, 234 | 10.1063/1.57128 | CGC-98-06 | gr-qc | null | It is shown that experiments of the Einstein-Podolski-Rosen type are the
natural consequence of the groupoid approach to noncommutative unification of
general relativity and quantum mechanics. The geometry of this model is
determined by the noncommutative algebra of complex valued, compactly supported
functions (with... | [
{
"created": "Wed, 3 Jun 1998 10:50:29 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Heller",
"M.",
"",
"Vatican Observatory"
],
[
"Sasin",
"W.",
"",
"Institute of Mathematics,\n Warsaw University of Technology"
]
] | It is shown that experiments of the Einstein-Podolski-Rosen type are the natural consequence of the groupoid approach to noncommutative unification of general relativity and quantum mechanics. The geometry of this model is determined by the noncommutative algebra of complex valued, compactly supported functions (with c... |
1310.6287 | Romualdo Tresguerres | Romualdo Tresguerres | Thermodynamics in dynamical spacetimes | 13 Revtex pages, no figures; matches the published version | Phys. Rev. D 89, 064032 (2014) | 10.1103/PhysRevD.89.064032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a general formulation of the laws of irreversible thermodynamics in
the presence of electromagnetism and gravity. For the handling of macroscopic
material media, we use as a guide the field equations and the Noether
identities of fundamental matter as deduced in the framework of gauge theories
of the Poinca... | [
{
"created": "Wed, 23 Oct 2013 16:41:54 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Nov 2013 22:55:36 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Mar 2014 14:45:44 GMT",
"version": "v3"
}
] | 2014-03-26 | [
[
"Tresguerres",
"Romualdo",
""
]
] | We derive a general formulation of the laws of irreversible thermodynamics in the presence of electromagnetism and gravity. For the handling of macroscopic material media, we use as a guide the field equations and the Noether identities of fundamental matter as deduced in the framework of gauge theories of the Poincar\... |
gr-qc/0104090 | Jose M. M. Senovilla | G. Bergqvist and J.M.M. Senovilla | Null cone preserving maps, causal tensors and algebraic Rainich theory | 36 pages, no figures, LaTeX file | Class.Quant.Grav. 18 (2001) 5299-5326 | 10.1088/0264-9381/18/23/323 | null | gr-qc math-ph math.DG math.MP | null | A rank-n tensor on a Lorentzian manifold V whose contraction with n arbitrary
causal future directed vectors is non-negative is said to have the dominant
property. These tensors, up to sign, are called causal tensors, and we
determine their general properties in dimension N. We prove that rank-2 tensors
which map the... | [
{
"created": "Thu, 26 Apr 2001 15:46:23 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bergqvist",
"G.",
""
],
[
"Senovilla",
"J. M. M.",
""
]
] | A rank-n tensor on a Lorentzian manifold V whose contraction with n arbitrary causal future directed vectors is non-negative is said to have the dominant property. These tensors, up to sign, are called causal tensors, and we determine their general properties in dimension N. We prove that rank-2 tensors which map the n... |
1106.5743 | Sarbari Guha | Sarbari Guha and Subenoy Chakraborty | Five-dimensional warped product space-time with time-dependent warp
factor and cosmology of the four-dimensional universe | 11 pages, no figures, accepted for publication in International
Journal of Theoretical Physics | null | 10.1007/s10773-011-0877-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have studied a 5-dimensional warped product space-time with
a time-dependent warp factor. This warp factor plays an important role in
localizing matter to the 4-dimensional hypersurface constituting the observed
universe and leads to a geometric interpretation of dynamical dark energy. The
five-dime... | [
{
"created": "Tue, 28 Jun 2011 17:54:21 GMT",
"version": "v1"
}
] | 2011-07-14 | [
[
"Guha",
"Sarbari",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this paper, we have studied a 5-dimensional warped product space-time with a time-dependent warp factor. This warp factor plays an important role in localizing matter to the 4-dimensional hypersurface constituting the observed universe and leads to a geometric interpretation of dynamical dark energy. The five-dimens... |
1804.06874 | Pablo Le\'on | C. Las Heras, P. Leon | Using MGD gravitational decoupling to extend the isotropic solutions of
Einstein equations to the anisotropical domain | 18 pages, 12 figures. Some references were added | Fortsch.Phys. 66 (2018) 070036 | 10.1002/prop.201800036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this work is to obtain new analitical solutions for Einstein
equations in the anisotropical domain. This will be done via the minimal
geometric deformation (MGD) approach, which is a simple and systematical method
that allow us to decouple the Einstein equations. It requires a perfect fluid
known solution ... | [
{
"created": "Wed, 18 Apr 2018 18:44:38 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2018 13:23:56 GMT",
"version": "v2"
},
{
"created": "Wed, 16 May 2018 01:23:49 GMT",
"version": "v3"
}
] | 2018-08-21 | [
[
"Heras",
"C. Las",
""
],
[
"Leon",
"P.",
""
]
] | The aim of this work is to obtain new analitical solutions for Einstein equations in the anisotropical domain. This will be done via the minimal geometric deformation (MGD) approach, which is a simple and systematical method that allow us to decouple the Einstein equations. It requires a perfect fluid known solution th... |
1209.4435 | Hassan Murad | Mohammad Hassan Murad | A new well behaved class of charge analogue of Adler's relativistic
exact solution | Accepted by Astrophysics and Space Science | null | 10.1007/s10509-012-1258-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper presents a new class of parametric interior solutions of
Einstein-Maxwell field equations in general relativity for a static spherically
symmetric distribution of a charged perfect fluid with a particular form of
electric field intensity. This solution gives us wide range of parameter, K,
for which the solu... | [
{
"created": "Thu, 20 Sep 2012 06:42:58 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Sep 2012 08:23:27 GMT",
"version": "v2"
}
] | 2012-09-25 | [
[
"Murad",
"Mohammad Hassan",
""
]
] | The paper presents a new class of parametric interior solutions of Einstein-Maxwell field equations in general relativity for a static spherically symmetric distribution of a charged perfect fluid with a particular form of electric field intensity. This solution gives us wide range of parameter, K, for which the soluti... |
2407.12314 | Abdallah Al Zahrani M. | A. M. Al Zahrani, A. Al-Jama | Charged Particles Capture Cross-Section by a Weakly Charged
Schwarzschild Black Hole | Accepted for publication in Research in Astronomy and Astrophysics
journal | null | 10.1088/1674-4527/ad63e6 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study the capture cross-section of charged particles by a weakly charged
Schwarzschild black hole. The dependence of the maximum impact parameter for
capture on the particle's energy is investigated numerically for different
values of the electromagnetic coupling strength between the particle and the
black hole. T... | [
{
"created": "Wed, 17 Jul 2024 04:46:52 GMT",
"version": "v1"
}
] | 2024-07-18 | [
[
"Zahrani",
"A. M. Al",
""
],
[
"Al-Jama",
"A.",
""
]
] | We study the capture cross-section of charged particles by a weakly charged Schwarzschild black hole. The dependence of the maximum impact parameter for capture on the particle's energy is investigated numerically for different values of the electromagnetic coupling strength between the particle and the black hole. The... |
1910.05286 | Carlos A. R. Herdeiro | Yves Brihaye, Carlos Herdeiro and Eugen Radu | Black hole spontaneous scalarisation with a positive cosmological
constant | 15 pages, 4 figures | null | 10.1016/j.physletb.2020.135269 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A scalar field non-minimally coupled to certain geometric [or matter]
invariants which are sourced by [electro]vacuum black holes (BHs) may
spontaneously grow around the latter, due to a tachyonic instability. This
process is expected to lead to a new, dynamically preferred, equilibrium state:
a scalarised BH. The mo... | [
{
"created": "Fri, 11 Oct 2019 16:27:19 GMT",
"version": "v1"
}
] | 2020-02-19 | [
[
"Brihaye",
"Yves",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Radu",
"Eugen",
""
]
] | A scalar field non-minimally coupled to certain geometric [or matter] invariants which are sourced by [electro]vacuum black holes (BHs) may spontaneously grow around the latter, due to a tachyonic instability. This process is expected to lead to a new, dynamically preferred, equilibrium state: a scalarised BH. The most... |
2205.00594 | Ran Li | Ran Li, Jin Wang | Non-Markovian dynamics of black hole phase transition | arXiv admin note: text overlap with arXiv:2201.06138 | null | 10.1103/PhysRevD.106.104039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a comprehensive study on the non-Markovian dynamics of the black
hole phase transitions based on the underlying free energy landscape. By
assuming that the transition processes between different black hole states are
stochastic, the non-Markovian dynamics of the black hole phase transition is
governed by t... | [
{
"created": "Mon, 2 May 2022 00:44:44 GMT",
"version": "v1"
}
] | 2022-11-30 | [
[
"Li",
"Ran",
""
],
[
"Wang",
"Jin",
""
]
] | We provide a comprehensive study on the non-Markovian dynamics of the black hole phase transitions based on the underlying free energy landscape. By assuming that the transition processes between different black hole states are stochastic, the non-Markovian dynamics of the black hole phase transition is governed by the... |
2309.11491 | Shammi Tahura | Shammi Tahura, Hassan Khalvati, Huan Yang | Vacuum Spacetime With Multipole Moments: The Minimal Size Conjecture,
Black Hole Shadow, and Gravitational Wave Observables | 18 pages; 8 figures; v2: Section 3B modified, derivation of minimal
size corrected, results remain the same; v3: Matches published version | null | 10.1103/PhysRevD.109.124025 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we explicitly construct the vacuum solution of Einstein's
equations with prescribed multipole moments. By observing the behavior of the
multipole spacetime metric at small distances, we conjecture that for a
sufficiently large multipole moment, there is a minimal size below which no
object in nature can... | [
{
"created": "Wed, 20 Sep 2023 17:39:35 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2024 22:58:32 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Jun 2024 01:57:42 GMT",
"version": "v3"
}
] | 2024-06-24 | [
[
"Tahura",
"Shammi",
""
],
[
"Khalvati",
"Hassan",
""
],
[
"Yang",
"Huan",
""
]
] | In this work, we explicitly construct the vacuum solution of Einstein's equations with prescribed multipole moments. By observing the behavior of the multipole spacetime metric at small distances, we conjecture that for a sufficiently large multipole moment, there is a minimal size below which no object in nature can s... |
gr-qc/0310031 | Irina Dymnikova | Irina Dymnikova | $\Lambda^{mu}_{\nu}$ geometries from the point of view of different
observers | 7 pages, 11 figures, Talk at the Fourth International Conference on
Physics Beyond the Standard Model "Beyond the Desert'03", Germany, 2003 | null | null | null | gr-qc | null | $\Lambda^{\mu}_{\nu}$-geometry is a geometry with a variable cosmological
term described by a second-rank symmetric tensor $\Lambda^{\mu}_{\nu}$ whose
asymptotics are Einstein cosmological term $\Lambda \delta ^{\mu}_{\nu}$ at the
origin and $\lambda \delta ^{\mu}_{\nu}$ at infinity (with $\lambda <
\Lambda$).
It c... | [
{
"created": "Mon, 6 Oct 2003 10:02:22 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Dymnikova",
"Irina",
""
]
] | $\Lambda^{\mu}_{\nu}$-geometry is a geometry with a variable cosmological term described by a second-rank symmetric tensor $\Lambda^{\mu}_{\nu}$ whose asymptotics are Einstein cosmological term $\Lambda \delta ^{\mu}_{\nu}$ at the origin and $\lambda \delta ^{\mu}_{\nu}$ at infinity (with $\lambda < \Lambda$). It corre... |
0705.2519 | Alessandro Nagar | Thibault Damour, Alessandro Nagar | Faithful Effective-One-Body waveforms of small-mass-ratio coalescing
black-hole binaries | 13 pages, 6 figures. To appear in Phys. Rev. D | Phys.Rev.D76:064028,2007 | 10.1103/PhysRevD.76.064028 | null | gr-qc | null | We address the problem of constructing high-accuracy, faithful analytic
waveforms describing the gravitational wave signal emitted by inspiralling and
coalescing binary black holes. We work within the Effective-One-Body (EOB)
framework and propose a methodology for improving the current
(waveform)implementations of t... | [
{
"created": "Thu, 17 May 2007 11:47:54 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2007 15:33:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Damour",
"Thibault",
""
],
[
"Nagar",
"Alessandro",
""
]
] | We address the problem of constructing high-accuracy, faithful analytic waveforms describing the gravitational wave signal emitted by inspiralling and coalescing binary black holes. We work within the Effective-One-Body (EOB) framework and propose a methodology for improving the current (waveform)implementations of thi... |
gr-qc/0401064 | Bijaya Kumar Sahoo | B.K.Sahoo and L.P.Singh | Gravitational Waves in Generalised Brans-Dicke Theory | 7Pages,no figures | Mod.Phys.Lett. A19 (2004) 1745-1758 | 10.1142/S0217732304014021 | null | gr-qc | null | We have solved cosmological gravitational Wave(GW)equation in the frame work
of Generalised Brans-Dicke(GBD) theory for all epochs of the Universe.The
solutions are expressed in terms of the present value of the Brans-Dicke
coupling parameter $\omega(\phi)$.It is seen that the solutions represent
travelling growing m... | [
{
"created": "Thu, 15 Jan 2004 09:09:28 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sahoo",
"B. K.",
""
],
[
"Singh",
"L. P.",
""
]
] | We have solved cosmological gravitational Wave(GW)equation in the frame work of Generalised Brans-Dicke(GBD) theory for all epochs of the Universe.The solutions are expressed in terms of the present value of the Brans-Dicke coupling parameter $\omega(\phi)$.It is seen that the solutions represent travelling growing mod... |
1503.08073 | Allan Alinea | Allan L. Alinea, Takahiro Kubota, Yukari Nakanishi, Wade Naylor (Osaka
U.) | Adiabatic regularisation of power spectra in $k$-inflation | 17 pages; v2, typos corrected & reference added; v3, rewrote some
parts for clarity | JCAP 06 (2015) 019 | 10.1088/1475-7516/2015/06/019 | OU-HET 853 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We look at the question posed by Parker et al. about the effect of UV
regularisation on the power spectrum for inflation. Focusing on the slow-roll
$k$-inflation, we show that up to second order in the Hubble and sound flow
parameters, the adiabatic regularisation of such model leads to no difference
in the power spe... | [
{
"created": "Thu, 26 Mar 2015 03:32:33 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2015 20:41:29 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Jul 2015 01:44:52 GMT",
"version": "v3"
}
] | 2015-07-07 | [
[
"Alinea",
"Allan L.",
"",
"Osaka\n U."
],
[
"Kubota",
"Takahiro",
"",
"Osaka\n U."
],
[
"Nakanishi",
"Yukari",
"",
"Osaka\n U."
],
[
"Naylor",
"Wade",
"",
"Osaka\n U."
]
] | We look at the question posed by Parker et al. about the effect of UV regularisation on the power spectrum for inflation. Focusing on the slow-roll $k$-inflation, we show that up to second order in the Hubble and sound flow parameters, the adiabatic regularisation of such model leads to no difference in the power spect... |
2310.16007 | Sebasti\'an Bahamonde Dr | Katsuki Aoki, Sebastian Bahamonde, Jorge Gigante Valcarcel, Mohammad
Ali Gorji | Cosmological Perturbation Theory in Metric-Affine Gravity | Matches published version in PRD. 23+20 pages, 5 appendices | Phys.Rev.D 110 (2024) 2, 024017 | 10.1103/PhysRevD.110.024017 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate cosmological perturbation theory around the spatially curved
FLRW background in the context of metric-affine gauge theory of gravity which
includes torsion and nonmetricity. Performing scalar-vector-tensor
decomposition of the spatial perturbations, we find that the theory displays a
rich perturbation sp... | [
{
"created": "Tue, 24 Oct 2023 17:02:03 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2024 01:21:04 GMT",
"version": "v2"
}
] | 2024-07-18 | [
[
"Aoki",
"Katsuki",
""
],
[
"Bahamonde",
"Sebastian",
""
],
[
"Valcarcel",
"Jorge Gigante",
""
],
[
"Gorji",
"Mohammad Ali",
""
]
] | We formulate cosmological perturbation theory around the spatially curved FLRW background in the context of metric-affine gauge theory of gravity which includes torsion and nonmetricity. Performing scalar-vector-tensor decomposition of the spatial perturbations, we find that the theory displays a rich perturbation spec... |
gr-qc/0409091 | Yuan-Zhong Zhang | A. Bhadra and K.K. Nandi | omega dependence of the scalar field in Brans-Dicke theory | 6 pages | Phys.Rev. D64 (2001) 087501 | 10.1103/PhysRevD.64.087501 | null | gr-qc | null | This article examines the claim that the Brans-Dicke scalar field \phi \to
\phi_{0} + O(1/\sqrt{\omega}) for large $\omega$ when the matter field is
traceless. It is argued that such a claim can not be true in general.
| [
{
"created": "Fri, 24 Sep 2004 08:03:50 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bhadra",
"A.",
""
],
[
"Nandi",
"K. K.",
""
]
] | This article examines the claim that the Brans-Dicke scalar field \phi \to \phi_{0} + O(1/\sqrt{\omega}) for large $\omega$ when the matter field is traceless. It is argued that such a claim can not be true in general. |
1111.0400 | James D. E. Grant | Piotr T. Chru\'sciel and James D. E. Grant | On Lorentzian causality with continuous metrics | Minor changes. Version to appear in Classical and Quantum Gravity | null | 10.1088/0264-9381/29/14/145001 | Preprint UWThPh-2011-33 | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic study of causality theory on Lorentzian manifolds
with continuous metrics. Examples are given which show that some standard facts
in smooth Lorentzian geometry, such as light-cones being hypersurfaces, are
wrong when metrics which are merely continuous are considered. We show that
existence of... | [
{
"created": "Wed, 2 Nov 2011 06:12:48 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2011 19:15:31 GMT",
"version": "v2"
},
{
"created": "Sun, 27 May 2012 17:48:52 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Grant",
"James D. E.",
""
]
] | We present a systematic study of causality theory on Lorentzian manifolds with continuous metrics. Examples are given which show that some standard facts in smooth Lorentzian geometry, such as light-cones being hypersurfaces, are wrong when metrics which are merely continuous are considered. We show that existence of t... |
1111.1448 | Micha{\l} Eckstein | Piotr T. Chru\'sciel, Micha{\l} Eckstein, Luc Nguyen, Sebastian J.
Szybka | Existence of singularities in two-Kerr black holes | minor rewordings, a reference added, version identical to the one
published in CQG | Class. Quantum Grav. 28 (2011) 245017 | 10.1088/0264-9381/28/24/245017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the angular momentum - area inequality 8\pi |J| =< A for weakly
stable minimal surfaces would apply to (I^+)-regular many-Kerr solutions, if
any existed. Hence we remove the undesirable hypothesis in the
Hennig-Neugebauer proof of non-existence of well behaved two-component
solutions.
| [
{
"created": "Sun, 6 Nov 2011 20:15:04 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Dec 2011 10:37:16 GMT",
"version": "v2"
}
] | 2011-12-06 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Eckstein",
"Michał",
""
],
[
"Nguyen",
"Luc",
""
],
[
"Szybka",
"Sebastian J.",
""
]
] | We show that the angular momentum - area inequality 8\pi |J| =< A for weakly stable minimal surfaces would apply to (I^+)-regular many-Kerr solutions, if any existed. Hence we remove the undesirable hypothesis in the Hennig-Neugebauer proof of non-existence of well behaved two-component solutions. |
2306.12895 | Alexey Golovnev | Alexey Golovnev | A Pamphlet against The Energy | 6 pages, 4 pictures, 1 epigraph | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is a well-known fact that there is no well-defined notion of conserved
energy in gravity. In my opinion, it is not a big deal. As a conserved
quantity, energy is a rather artificial invention which works perfectly well as
long as we have a natural symmetry with respect to translations in time,
however not when the... | [
{
"created": "Thu, 22 Jun 2023 14:02:48 GMT",
"version": "v1"
}
] | 2023-06-23 | [
[
"Golovnev",
"Alexey",
""
]
] | It is a well-known fact that there is no well-defined notion of conserved energy in gravity. In my opinion, it is not a big deal. As a conserved quantity, energy is a rather artificial invention which works perfectly well as long as we have a natural symmetry with respect to translations in time, however not when there... |
gr-qc/0510080 | Romualdo Tresguerres | A. Tiemblo and R. Tresguerres | Towards a general solution of the Hamiltonian constraints of General
Relativity | 10 Revtex pages, no figures. Modified version | Gen.Rel.Grav. 38 (2006) 1839-1859 | 10.1007/s10714-006-0361-7 | null | gr-qc | null | The present work has a double aim. On the one hand we call attention on the
relationship existing between the Ashtekar formalism and other
gauge-theoretical approaches to gravity, in particular the Poincar\'e Gauge
Theory. On the other hand we study two kinds of solutions for the constraints
of General Relativity, co... | [
{
"created": "Mon, 17 Oct 2005 11:24:12 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2006 14:00:33 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Tiemblo",
"A.",
""
],
[
"Tresguerres",
"R.",
""
]
] | The present work has a double aim. On the one hand we call attention on the relationship existing between the Ashtekar formalism and other gauge-theoretical approaches to gravity, in particular the Poincar\'e Gauge Theory. On the other hand we study two kinds of solutions for the constraints of General Relativity, cons... |
2404.09107 | Jose Edgar Madriz Aguilar Dr. | Jos\'e Edgar Madriz Aguilar, Diego Allan Reyna | Power law coupling Higgs-Palatini inflation with a congruence between
physical and geometrical symmetries | 12 pages, 3 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In this paper we investigate a power law coupling Higgs inflationary model in
which the background geometry is determined by the Palatini's variational
principle. The geometrical symmetries of the background geometry determine the
invariant form of the action of the model and the background geometry resulted
is of th... | [
{
"created": "Sun, 14 Apr 2024 00:20:50 GMT",
"version": "v1"
}
] | 2024-04-16 | [
[
"Aguilar",
"José Edgar Madriz",
""
],
[
"Reyna",
"Diego Allan",
""
]
] | In this paper we investigate a power law coupling Higgs inflationary model in which the background geometry is determined by the Palatini's variational principle. The geometrical symmetries of the background geometry determine the invariant form of the action of the model and the background geometry resulted is of the ... |
gr-qc/9710066 | Carsten Gundlach | Carsten Gundlach (Albert Einstein Institut, Potsdam) | Nonspherical perturbations of critical collapse and cosmic censorship | 5 pages, RevTex, 1 figure. Changes in discussion, accepted for
publication in PRD Rapid Comm | Phys.Rev.D57:7075-7079,1998 | 10.1103/PhysRevD.57.7075 | null | gr-qc | null | Choptuik has demonstrated that naked singularities can arise in gravitational
collapse from smooth, asymptotically flat initial data, and that such data have
codimension one in spherical symmetry. Here we show, for perfect fluid matter
with equation of state $p=\rho/3$, by perturbing around spherical symmetry,
that s... | [
{
"created": "Sun, 12 Oct 1997 18:47:04 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jun 1998 09:21:50 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Gundlach",
"Carsten",
"",
"Albert Einstein Institut, Potsdam"
]
] | Choptuik has demonstrated that naked singularities can arise in gravitational collapse from smooth, asymptotically flat initial data, and that such data have codimension one in spherical symmetry. Here we show, for perfect fluid matter with equation of state $p=\rho/3$, by perturbing around spherical symmetry, that suc... |
1706.07520 | Koji Yamaguchi | Masahiro Hotta, Yasusada Nambu and Koji Yamaguchi | Soft-Hair-Enhanced Entanglement Beyond Page Curves in a Black-hole
Evaporation Qubit Model | 10pages, 3 figures | Phys. Rev. Lett. 120, 181301 (2018) | 10.1103/PhysRevLett.120.181301 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model with multiple qubits that reproduces the thermal
properties of 4-dimensional (4-dim) Schwarzschild black holes (BHs) by
simultaneously taking account of the emission of Hawking particles and the
zero-energy soft hair evaporation at horizon. The results verify that the
entanglement entropy between a... | [
{
"created": "Thu, 22 Jun 2017 23:09:15 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2018 09:17:35 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Mar 2018 02:54:55 GMT",
"version": "v3"
},
{
"created": "Sun, 6 May 2018 23:37:04 GMT",
"version": "v4"
}
] | 2018-05-08 | [
[
"Hotta",
"Masahiro",
""
],
[
"Nambu",
"Yasusada",
""
],
[
"Yamaguchi",
"Koji",
""
]
] | We propose a model with multiple qubits that reproduces the thermal properties of 4-dimensional (4-dim) Schwarzschild black holes (BHs) by simultaneously taking account of the emission of Hawking particles and the zero-energy soft hair evaporation at horizon. The results verify that the entanglement entropy between a q... |
1905.00678 | Bhaskar Biswas | Bhaskar Biswas, Rana Nandi, Prasanta Char and Sukanta Bose | Role of crustal physics in the tidal deformation of a neutron star | 26 pages, 10 figures | Phys. Rev. D 100, 044056 (2019) | 10.1103/PhysRevD.100.044056 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the late inspiral phase, gravitational waves from binary neutron star
mergers carry the imprint of the equation of state due to the tidally deformed
structure of the components. If the stars contain solid crusts, then their
shear modulus can affect the deformability of the star and, thereby, modify the
emitted sig... | [
{
"created": "Thu, 2 May 2019 11:48:44 GMT",
"version": "v1"
}
] | 2019-09-02 | [
[
"Biswas",
"Bhaskar",
""
],
[
"Nandi",
"Rana",
""
],
[
"Char",
"Prasanta",
""
],
[
"Bose",
"Sukanta",
""
]
] | In the late inspiral phase, gravitational waves from binary neutron star mergers carry the imprint of the equation of state due to the tidally deformed structure of the components. If the stars contain solid crusts, then their shear modulus can affect the deformability of the star and, thereby, modify the emitted signa... |
1310.2341 | Dipongkar Talukder | Dipongkar Talukder, Sukanta Bose, Sarah Caudill, and Paul T. Baker | Improved Coincident and Coherent Detection Statistics for Searches for
Gravitational Wave Ringdown Signals | null | Phys. Rev. D 88, 122002 (2013) | 10.1103/PhysRevD.88.122002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study an improved method for detecting gravitational wave (GW) signals
from perturbed black holes by earth-based detectors in the quest for searching
for intermediate-mass black holes (IMBHs). Such signals, called ringdowns, are
damped sinusoids whose frequency and damping constant can be used to measure a
black h... | [
{
"created": "Wed, 9 Oct 2013 04:38:36 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Oct 2013 03:04:13 GMT",
"version": "v2"
}
] | 2013-12-16 | [
[
"Talukder",
"Dipongkar",
""
],
[
"Bose",
"Sukanta",
""
],
[
"Caudill",
"Sarah",
""
],
[
"Baker",
"Paul T.",
""
]
] | We study an improved method for detecting gravitational wave (GW) signals from perturbed black holes by earth-based detectors in the quest for searching for intermediate-mass black holes (IMBHs). Such signals, called ringdowns, are damped sinusoids whose frequency and damping constant can be used to measure a black hol... |
2112.12992 | Jaume Haro | Llibert Arest\'e Sal\'o and Jaume de Haro | Gravitational particle production of superheavy massive particles in
Quintessential Inflation II: $\alpha$-attractors | 8 pages, 4 figures. Comments will be welcome. arXiv admin note:
substantial text overlap with arXiv:2108.10795, arXiv:2108.11144 | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We compute the gravitational production of conformally coupled superheavy
particles during the phase transition from the end of inflation to the
beginning of kination for $\alpha$-attractors potentials in the context of
Quintessential Inflation ($\alpha$-QI), showing that the maximum value of the
reheating temperatur... | [
{
"created": "Fri, 24 Dec 2021 08:26:25 GMT",
"version": "v1"
}
] | 2021-12-28 | [
[
"Saló",
"Llibert Aresté",
""
],
[
"de Haro",
"Jaume",
""
]
] | We compute the gravitational production of conformally coupled superheavy particles during the phase transition from the end of inflation to the beginning of kination for $\alpha$-attractors potentials in the context of Quintessential Inflation ($\alpha$-QI), showing that the maximum value of the reheating temperature,... |
1603.09567 | Tao Wang | Yun-Chao Wang, Towe Wang | Non-canonical two-field inflation to order $\xi^2$ | 24 pages, 6 figures, Appendix E added | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In non-canonical two-field inflation models, deviations from the canonical
model can be captured by a parameter $\xi$. We show this parameter is usually
one half of the slow-roll order and analytically calculate the primordial power
spectra accurate to order $\xi^2$. The super-horizon perturbations are studied
with a... | [
{
"created": "Thu, 31 Mar 2016 12:58:56 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2016 09:30:09 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Dec 2017 01:32:48 GMT",
"version": "v3"
}
] | 2017-12-06 | [
[
"Wang",
"Yun-Chao",
""
],
[
"Wang",
"Towe",
""
]
] | In non-canonical two-field inflation models, deviations from the canonical model can be captured by a parameter $\xi$. We show this parameter is usually one half of the slow-roll order and analytically calculate the primordial power spectra accurate to order $\xi^2$. The super-horizon perturbations are studied with an ... |
gr-qc/0612003 | Janna Levin | Janna Levin | Chaos and Order in Models of Black Hole Pairs | null | Phys.Rev.D74:124027,2006 | 10.1103/PhysRevD.74.124027 | null | gr-qc | null | Chaos in the orbits of black hole pairs has by now been confirmed by several
independent groups. While the chaotic behavior of binary black hole orbits is
no longer argued, it remains difficult to quantify the importance of chaos to
the evolutionary dynamics of a pair of comparable mass black holes. None of our
exist... | [
{
"created": "Fri, 1 Dec 2006 00:37:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Levin",
"Janna",
""
]
] | Chaos in the orbits of black hole pairs has by now been confirmed by several independent groups. While the chaotic behavior of binary black hole orbits is no longer argued, it remains difficult to quantify the importance of chaos to the evolutionary dynamics of a pair of comparable mass black holes. None of our existin... |
2112.11945 | Krishnanand K Nair | Krishnanand K. Nair and Mathew Thomas Arun | Kalb-Ramond field induced cosmological bounce in generalized
teleparallel gravity | 11 pages, 6 figures; Published version | Phys. Rev. D 105, 103505 (2022) | 10.1103/PhysRevD.105.103505 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | One of the important open questions in high-energy physics is to understand
the lack of evidence of Kalb-Ramond (KR) field, in particular in the present
day cosmology. In this paper we aim to address this issue by showing that a
bounce scenario in the evolution of the Universe strongly advocates their
elusiveness, ev... | [
{
"created": "Wed, 22 Dec 2021 15:08:58 GMT",
"version": "v1"
},
{
"created": "Fri, 6 May 2022 06:26:32 GMT",
"version": "v2"
}
] | 2022-05-09 | [
[
"Nair",
"Krishnanand K.",
""
],
[
"Arun",
"Mathew Thomas",
""
]
] | One of the important open questions in high-energy physics is to understand the lack of evidence of Kalb-Ramond (KR) field, in particular in the present day cosmology. In this paper we aim to address this issue by showing that a bounce scenario in the evolution of the Universe strongly advocates their elusiveness, even... |
2407.14184 | Changjun Gao | Changjun Gao and Jianhui Qiu | From the Janis-Newman-Winicour naked singularities to Einstein-Maxwell
phantom wormholes | 20 pages,3 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Janis-Newman-Winicour spacetime corresponds to a static spherically
symmetric solution of Einstein equations with the energy momentum tensor of a
massless quintessence field. It is understood that the spacetime describes a
naked singularity. The solution has two parameters, $b$ and $s$. To our
knowledge, the exac... | [
{
"created": "Fri, 19 Jul 2024 10:28:31 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2024 11:54:04 GMT",
"version": "v2"
}
] | 2024-07-23 | [
[
"Gao",
"Changjun",
""
],
[
"Qiu",
"Jianhui",
""
]
] | The Janis-Newman-Winicour spacetime corresponds to a static spherically symmetric solution of Einstein equations with the energy momentum tensor of a massless quintessence field. It is understood that the spacetime describes a naked singularity. The solution has two parameters, $b$ and $s$. To our knowledge, the exact ... |
gr-qc/0312064 | Marcelo J. Reboucas | M.J. Reboucas, J. Santos, A.F.F. Teixeira | Classification of Energy Momentum Tensors in $n \geq 5$ Dimensional
Space-times: a Review | LaTex2e, 18 pages. To appear in Braz.J.Phys (2004) | Braz.J.Phys. 34 (2004) 535-543 | 10.1590/S0103-97332004000300034 | null | gr-qc astro-ph hep-th | null | Recent developments in string theory suggest that there might exist extra
spatial dimensions, which are not small nor compact. The framework of a great
number of brane cosmological models is that in which the matter fields are
confined on a brane-world embedded in five dimensions (the bulk). Motivated by
this we revi... | [
{
"created": "Fri, 12 Dec 2003 01:51:45 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Reboucas",
"M. J.",
""
],
[
"Santos",
"J.",
""
],
[
"Teixeira",
"A. F. F.",
""
]
] | Recent developments in string theory suggest that there might exist extra spatial dimensions, which are not small nor compact. The framework of a great number of brane cosmological models is that in which the matter fields are confined on a brane-world embedded in five dimensions (the bulk). Motivated by this we review... |
1711.05539 | Giulia Gubitosi | Giulia Gubitosi, Joao Magueijo | Primordial standing waves | null | Phys. Rev. D 97, 063509 (2018) | 10.1103/PhysRevD.97.063509 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility that the primordial fluctuations (scalar and
tensor) might have been standing waves at their moment of creation, whether or
not they had a quantum origin. We lay down the general conditions for spatial
translational invariance, and isolate the pieces of the most general such
theory that co... | [
{
"created": "Wed, 15 Nov 2017 12:45:29 GMT",
"version": "v1"
}
] | 2018-03-21 | [
[
"Gubitosi",
"Giulia",
""
],
[
"Magueijo",
"Joao",
""
]
] | We consider the possibility that the primordial fluctuations (scalar and tensor) might have been standing waves at their moment of creation, whether or not they had a quantum origin. We lay down the general conditions for spatial translational invariance, and isolate the pieces of the most general such theory that comp... |
gr-qc/9305005 | null | Nguyen Hong Chuong and Nguyen Van Hoang | Cosmological Constant and Gravitational Repulsion Effect: 1. Homogeneous
models with radiation | REVTEX, 11 pages, Syracuse University preprint SU-GP-93/5-1 | Int.J.Mod.Phys. D2 (1993) 443-450 | 10.1142/S0218271893000313 | null | gr-qc astro-ph | null | Within the framework of the minimum quadratic Poincare gauge theory of
gravity in the Riemann-Cartan spacetime we study the influence of gravitational
vacuum energy density (a cosmological constant) on the dynamics of various
gravitating systems. It is shown that the inclusion of the cosmological term
can lead to gra... | [
{
"created": "Thu, 6 May 1993 23:45:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Chuong",
"Nguyen Hong",
""
],
[
"Van Hoang",
"Nguyen",
""
]
] | Within the framework of the minimum quadratic Poincare gauge theory of gravity in the Riemann-Cartan spacetime we study the influence of gravitational vacuum energy density (a cosmological constant) on the dynamics of various gravitating systems. It is shown that the inclusion of the cosmological term can lead to gravi... |
1512.04037 | Junji Jia | Xionghui Liu, Nan Yang, Junji Jia | Gravitational lensing of massive particles in Schwarzschild gravity | typos corrected. One formula re-written. To match the published
version | Class. Quantum Grav. 33 (2016) 175014 | 10.1088/0264-9381/33/17/175014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Both massless light ray and objects with nonzero mass experience trajectory
bending in a gravitational field. In this work the bending of trajectories of
massive objects in a Schwarzschild spacetime and the corresponding
gravitational lensing (GL) effects are studied. A particle sphere for
Schwarzschild black hole (B... | [
{
"created": "Sun, 13 Dec 2015 11:36:50 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Sep 2016 14:40:41 GMT",
"version": "v2"
}
] | 2016-09-02 | [
[
"Liu",
"Xionghui",
""
],
[
"Yang",
"Nan",
""
],
[
"Jia",
"Junji",
""
]
] | Both massless light ray and objects with nonzero mass experience trajectory bending in a gravitational field. In this work the bending of trajectories of massive objects in a Schwarzschild spacetime and the corresponding gravitational lensing (GL) effects are studied. A particle sphere for Schwarzschild black hole (BH)... |
gr-qc/0512160 | Emanuele Berti | Emanuele Berti, Vitor Cardoso, Clifford M. Will | On gravitational-wave spectroscopy of massive black holes with the space
interferometer LISA | 44 pages, 21 figures, 10 tables. Minor changes to match version in
press in Phys. Rev. D | Phys.Rev.D73:064030,2006 | 10.1103/PhysRevD.73.064030 | null | gr-qc astro-ph hep-th | null | Newly formed black holes are expected to emit characteristic radiation in the
form of quasi-normal modes, called ringdown waves, with discrete frequencies.
LISA should be able to detect the ringdown waves emitted by oscillating
supermassive black holes throughout the observable Universe. We develop a
multi-mode forma... | [
{
"created": "Thu, 29 Dec 2005 02:27:13 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2006 15:41:15 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Will",
"Clifford M.",
""
]
] | Newly formed black holes are expected to emit characteristic radiation in the form of quasi-normal modes, called ringdown waves, with discrete frequencies. LISA should be able to detect the ringdown waves emitted by oscillating supermassive black holes throughout the observable Universe. We develop a multi-mode formali... |
gr-qc/0109088 | Anand S. Sengupta | Anand S. Sengupta (1), Sanjeev V. Dhurandhar (1), Albert Lazzarini (2)
and Tom Prince (3) ((1) IUCAA, Pune, India (2) LIGO Laboratory, Caltech (3)
Jet Propulsion Laboratory, Caltech) | Extended hierarchical search (EHS) algorithm for detection of
gravitational waves from inspiraling compact binaries | 6 pages, 6 EPS figures, uses CQG style iopart.cls | Class.Quant.Grav. 19 (2002) 1507-1512 | 10.1088/0264-9381/19/7/337 | IUCAA-42/2001, LIGO-P010020-00-E | gr-qc | null | Pattern matching techniques like matched filtering will be used for online
extraction of gravitational wave signals buried inside detector noise. This
involves cross correlating the detector output with hundreds of thousands of
templates spanning a multi-dimensional parameter space, which is very expensive
computatio... | [
{
"created": "Thu, 27 Sep 2001 11:13:33 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sengupta",
"Anand S.",
""
],
[
"Dhurandhar",
"Sanjeev V.",
""
],
[
"Lazzarini",
"Albert",
""
],
[
"Prince",
"Tom",
""
]
] | Pattern matching techniques like matched filtering will be used for online extraction of gravitational wave signals buried inside detector noise. This involves cross correlating the detector output with hundreds of thousands of templates spanning a multi-dimensional parameter space, which is very expensive computationa... |
gr-qc/0109022 | Nora Breton | Nora Breton | Born-Infeld generalization of the Reissner-Nordstrom black hole | 16 pages, latex, 6 postscript figures | null | null | null | gr-qc | null | In this work we study the trajectories of test particles in a geometry that
is the nonlinear electromagnetic generalization of the Reissner-Nordstrom
solution. The studied spacetime is a Einstein-Born-Infeld solution, nonsingular
outside a regular event horizon and characterized by three parameters: mass
$M$, charge ... | [
{
"created": "Thu, 6 Sep 2001 15:10:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Breton",
"Nora",
""
]
] | In this work we study the trajectories of test particles in a geometry that is the nonlinear electromagnetic generalization of the Reissner-Nordstrom solution. The studied spacetime is a Einstein-Born-Infeld solution, nonsingular outside a regular event horizon and characterized by three parameters: mass $M$, charge $Q... |
gr-qc/0607120 | Jose M. M. Senovilla | Jos\'e M.M. Senovilla | Symmetric hyperbolic systems for a large class of fields in arbitrary
dimension | 24 pages, no figures | Gen.Rel.Grav.39:361-386,2007 | 10.1007/s10714-006-0390-2 | null | gr-qc | null | Symmetric hyperbolic systems of equations are explicitly constructed for a
general class of tensor fields by considering their structure as r-fold forms.
The hyperbolizations depend on 2r-1 arbitrary timelike vectors. The importance
of the so-called "superenergy" tensors, which provide the necessary symmetric
positiv... | [
{
"created": "Wed, 26 Jul 2006 16:32:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Senovilla",
"José M. M.",
""
]
] | Symmetric hyperbolic systems of equations are explicitly constructed for a general class of tensor fields by considering their structure as r-fold forms. The hyperbolizations depend on 2r-1 arbitrary timelike vectors. The importance of the so-called "superenergy" tensors, which provide the necessary symmetric positive ... |
2205.13513 | Agata Trovato | P. Bacon, A. Trovato, M. Bejger | Denoising gravitational-wave signals from binary black holes with
dilated convolutional autoencoder | 27 pages, 5 figures in the text and 7 in the appendix | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Broadband frequency output of gravitational-wave detectors is a
non-stationary and non-Gaussian time series data stream dominated by noise
populated by local disturbances and transient artifacts, which evolve on the
same timescale as the gravitational-wave signals and may corrupt the
astrophysical information. We stu... | [
{
"created": "Thu, 26 May 2022 17:32:25 GMT",
"version": "v1"
}
] | 2022-05-27 | [
[
"Bacon",
"P.",
""
],
[
"Trovato",
"A.",
""
],
[
"Bejger",
"M.",
""
]
] | Broadband frequency output of gravitational-wave detectors is a non-stationary and non-Gaussian time series data stream dominated by noise populated by local disturbances and transient artifacts, which evolve on the same timescale as the gravitational-wave signals and may corrupt the astrophysical information. We study... |
2301.11439 | Theodoros Papanikolaou | Theodoros Papanikolaou | Primordial black holes in loop quantum cosmology: The effect on the
threshold | Accepted in Classical and Quantum Gravity | null | 10.1088/1361-6382/acd97d | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Primordial black holes form in the early Universe and constitute one of the
most viable candidates for dark matter. The study of their formation process
requires the determination of a critical energy density perturbation threshold
$\delta_\mathrm{c}$, which in general depends on the underlying gravity theory.
Up to ... | [
{
"created": "Thu, 26 Jan 2023 21:57:05 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 2023 13:29:08 GMT",
"version": "v2"
}
] | 2023-06-21 | [
[
"Papanikolaou",
"Theodoros",
""
]
] | Primordial black holes form in the early Universe and constitute one of the most viable candidates for dark matter. The study of their formation process requires the determination of a critical energy density perturbation threshold $\delta_\mathrm{c}$, which in general depends on the underlying gravity theory. Up to no... |
1701.07444 | Ram Brustein | Ram Brustein, A.J.M. Medved, K. Yagi | Discovering the interior of black holes | Added author, added discussion of detectability, clarified
conclusions, 32 pages, 3 figures. V3 agrees with the accepted version - minor
revisions | Phys. Rev. D 96, 124021 (2017) | 10.1103/PhysRevD.96.124021 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of gravitational waves (GWs) from black hole (BH) mergers
provides an inroad toward probing the interior of astrophysical BHs. The
general-relativistic description of the BH interior is that of empty spacetime
with a (possibly) singular core. Recently, however, the hypothesis that the BH
interior does n... | [
{
"created": "Wed, 25 Jan 2017 19:01:11 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 2017 09:00:17 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Dec 2017 07:26:37 GMT",
"version": "v3"
}
] | 2017-12-27 | [
[
"Brustein",
"Ram",
""
],
[
"Medved",
"A. J. M.",
""
],
[
"Yagi",
"K.",
""
]
] | The detection of gravitational waves (GWs) from black hole (BH) mergers provides an inroad toward probing the interior of astrophysical BHs. The general-relativistic description of the BH interior is that of empty spacetime with a (possibly) singular core. Recently, however, the hypothesis that the BH interior does not... |
1804.08079 | Tiberiu Harko | Xiaoyue Zhang, Man Ho Chan, Tiberiu Harko, Shi-Dong Liang, Chun Sing
Leung | Slowly rotating Bose Einstein Condensate galactic dark matter halos, and
their rotation curves | 22 pages, 7 figures, accepted for publication in EPJC | The European Physical Journal C 78, 346 (2018) | 10.1140/epjc/s10052-018-5835-8 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If dark matter is composed of massive bosons, a Bose-Einstein Condensation
process must have occurred during the cosmological evolution. Therefore
galactic dark matter may be in a form of a condensate, characterized by a
strong self-interaction. We consider the effects of rotation on the
Bose-Einstein Condensate dark... | [
{
"created": "Sun, 22 Apr 2018 07:38:58 GMT",
"version": "v1"
}
] | 2018-07-24 | [
[
"Zhang",
"Xiaoyue",
""
],
[
"Chan",
"Man Ho",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Liang",
"Shi-Dong",
""
],
[
"Leung",
"Chun Sing",
""
]
] | If dark matter is composed of massive bosons, a Bose-Einstein Condensation process must have occurred during the cosmological evolution. Therefore galactic dark matter may be in a form of a condensate, characterized by a strong self-interaction. We consider the effects of rotation on the Bose-Einstein Condensate dark m... |
2210.00781 | Boris Latosh | Boris N. Latosh | Scalaron Decay in Perturbative Quantum Gravity | null | J. Exp. Theor. Phys. 136, 555 (2023) | 10.1134/S1063776123050023 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | A certain quadratic gravity model provides a successfully inflationary
scenario. The inflation is driven by the new scalar degree of freedom called
scalaron. After the end of inflation the scalaron decays in matter and dark
matter degrees of freedom reheating the Universe. We study new channels by
which the scalaron ... | [
{
"created": "Mon, 3 Oct 2022 09:36:59 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Latosh",
"Boris N.",
""
]
] | A certain quadratic gravity model provides a successfully inflationary scenario. The inflation is driven by the new scalar degree of freedom called scalaron. After the end of inflation the scalaron decays in matter and dark matter degrees of freedom reheating the Universe. We study new channels by which the scalaron ca... |
gr-qc/0501067 | Bijan Saha | Bijan Saha | Anisotropic cosmological models with perfect fluid and dark energy
revisited | RevTex, 9 pages, 8 figures | Int.J.Theor.Phys. 45 (2006) 952-964 | 10.1007/s10773-006-9089-0 | null | gr-qc | null | We consider a self-consistent system of Bianchi type-I (BI) gravitational
field and a binary mixture of perfect fluid and dark energy. The perfect fluid
is taken to be the one obeying the usual equation of state, i.e., $p = \zeta
\ve$, with $\zeta \in [0, 1]$ whereas, the dark energy is considered to be
obeying a qui... | [
{
"created": "Fri, 21 Jan 2005 12:22:54 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Saha",
"Bijan",
""
]
] | We consider a self-consistent system of Bianchi type-I (BI) gravitational field and a binary mixture of perfect fluid and dark energy. The perfect fluid is taken to be the one obeying the usual equation of state, i.e., $p = \zeta \ve$, with $\zeta \in [0, 1]$ whereas, the dark energy is considered to be obeying a quint... |
2209.15047 | Philip D. Mannheim | Philip D. Mannheim | How to quantize gravity and how not to quantize gravity | Extended version 34 pages. Uses sn-jnl.cls. Prepared for a Special
Issue in the European Physical Journal Plus on "Higher Derivatives in Quantum
Gravity: Theory, Tests, and Phenomenology" | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Taking the quantization of electromagnetism as the paradigm, we show how this
procedure cannot work for Einstein gravity. However, it does work for conformal
gravity, a fourth-order derivative, renormalizable theory of gravity that
Bender and Mannheim have shown to be ghost free. We show that in any gravity
theory gr... | [
{
"created": "Thu, 29 Sep 2022 18:43:49 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jan 2023 02:34:47 GMT",
"version": "v2"
}
] | 2023-01-18 | [
[
"Mannheim",
"Philip D.",
""
]
] | Taking the quantization of electromagnetism as the paradigm, we show how this procedure cannot work for Einstein gravity. However, it does work for conformal gravity, a fourth-order derivative, renormalizable theory of gravity that Bender and Mannheim have shown to be ghost free. We show that in any gravity theory grav... |
gr-qc/9310018 | Mourad | J. Mourad | Space-time events and relativistic particle localization | 13 pages, LPTHE 93/41 | null | null | null | gr-qc hep-th | null | A relation expressing the covariant transformation properties of a
relativistic position operator is derived. This relation differs from the one
existing in the literature expressing manifest covariance by some factor
ordering. The relation is derived in order for the localization of a particle
to represent a space-t... | [
{
"created": "Mon, 11 Oct 1993 19:04:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mourad",
"J.",
""
]
] | A relation expressing the covariant transformation properties of a relativistic position operator is derived. This relation differs from the one existing in the literature expressing manifest covariance by some factor ordering. The relation is derived in order for the localization of a particle to represent a space-tim... |
1405.2277 | Serguei Krasnikov | S. Krasnikov | Time machines with the compactly determined Cauchy horizon | A few minor amendments | Phys. Rev. D90 (2014) 024067 | 10.1103/PhysRevD.90.024067 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The building of a time machine, if possible at all, requires the relevant
regions of spacetime to be compact (that is, physically speaking, free from
sources of unpredictability such as infinities and singularities). Motivated by
this argument we consider the spacetimes with the compactly determined Cauchy
horizons (... | [
{
"created": "Fri, 9 May 2014 16:14:46 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Aug 2014 10:15:05 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Krasnikov",
"S.",
""
]
] | The building of a time machine, if possible at all, requires the relevant regions of spacetime to be compact (that is, physically speaking, free from sources of unpredictability such as infinities and singularities). Motivated by this argument we consider the spacetimes with the compactly determined Cauchy horizons (CD... |
gr-qc/9910065 | Claus Kiefer | C. Kiefer, D. Polarski, A.A. Starobinsky | Entropy of gravitons produced in the early Universe | 8 pages, REVTEX, final version to match the version to be published
in Phys. Rev. D; minor additions in the Introduction, results unchanged | Phys.Rev. D62 (2000) 043518 | 10.1103/PhysRevD.62.043518 | Freiburg THEP-99/5 | gr-qc astro-ph hep-th quant-ph | null | Gravitons produced from quantum vacuum fluctuations during an inflationary
stage in the early Universe have zero entropy as far as they reflect the time
evolution (squeezing) of a pure state, their large occupation number
notwithstanding. A non-zero entropy of the gravitons (classical gravitational
waves (GW) after d... | [
{
"created": "Wed, 20 Oct 1999 07:43:47 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Apr 2000 11:02:43 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kiefer",
"C.",
""
],
[
"Polarski",
"D.",
""
],
[
"Starobinsky",
"A. A.",
""
]
] | Gravitons produced from quantum vacuum fluctuations during an inflationary stage in the early Universe have zero entropy as far as they reflect the time evolution (squeezing) of a pure state, their large occupation number notwithstanding. A non-zero entropy of the gravitons (classical gravitational waves (GW) after dec... |
1207.1646 | Mahouton J. Stephane Houndjo Dr | M. J. S. Houndjo, F. G. Alvarenga, Manuel E. Rodrigues, Deborah F.
Jardim and R. Myrzakulov | Thermodynamics in Little Rip cosmology in the framework of a type of
f(R,T) gravity | 18 pages | Eur. Phys. J. Plus (2014) 129: 171 | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological reconstruction of Little Rip model in $f(R, T)$ gravity is
investigated, where $R$ is the curvature scalar and $T$ the trace of the energy
momentum tensor. The model perfectly reproduces the present stage of the
universe, characterized by the $\Lambda CDM$ model, without singularity at
future finite-time... | [
{
"created": "Thu, 5 Jul 2012 19:35:35 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Dec 2012 00:21:00 GMT",
"version": "v2"
}
] | 2014-09-05 | [
[
"Houndjo",
"M. J. S.",
""
],
[
"Alvarenga",
"F. G.",
""
],
[
"Rodrigues",
"Manuel E.",
""
],
[
"Jardim",
"Deborah F.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | Cosmological reconstruction of Little Rip model in $f(R, T)$ gravity is investigated, where $R$ is the curvature scalar and $T$ the trace of the energy momentum tensor. The model perfectly reproduces the present stage of the universe, characterized by the $\Lambda CDM$ model, without singularity at future finite-time (... |
2401.14251 | Istvan Racz | Istv\'an R\'acz | On quasi-local angular momentum and the construction of axial vector
fields | The suggested angular momentum expression is gauge-dependent | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A method is introduced which, for the first time, allows us to construct
axial vector fields without which formal definitions of quasi-local angular
momentum, in general, would remain empty. The introduced method is practical,
it can be used to construct all such axial vector fields, and it allows the
quasi-local ang... | [
{
"created": "Thu, 25 Jan 2024 15:41:29 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2024 08:12:32 GMT",
"version": "v2"
}
] | 2024-02-09 | [
[
"Rácz",
"István",
""
]
] | A method is introduced which, for the first time, allows us to construct axial vector fields without which formal definitions of quasi-local angular momentum, in general, would remain empty. The introduced method is practical, it can be used to construct all such axial vector fields, and it allows the quasi-local angul... |
1805.05889 | Poonam Agrawal Dr | D. D. Pawar, G. G. Bhuttampalle and P. K. Agrawal | Kaluza-Klein String Cosmological Model in f(R; T) Theory of Gravity | Accepted for publication in New Astronomy, May 2018 | null | 10.1016/j.newast.2018.05.002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have studied Kaluza-Klein string cosmological model within
the framework of f(R; T) theory of gravity, where R is the Ricci scalar and T
is the trace of the stress energy momentum tensor. We have obtained the
solution of the corresponding field equations by using a time varying
deceleration parameter... | [
{
"created": "Tue, 15 May 2018 16:23:23 GMT",
"version": "v1"
}
] | 2018-06-06 | [
[
"Pawar",
"D. D.",
""
],
[
"Bhuttampalle",
"G. G.",
""
],
[
"Agrawal",
"P. K.",
""
]
] | In this paper we have studied Kaluza-Klein string cosmological model within the framework of f(R; T) theory of gravity, where R is the Ricci scalar and T is the trace of the stress energy momentum tensor. We have obtained the solution of the corresponding field equations by using a time varying deceleration parameter. ... |
2012.00047 | Ismael Ayuso | Ismael Ayuso, Francisco S. N. Lobo and Jos\'e P. Mimoso | Wormhole geometries induced by action-dependent Lagrangian theories | 11 pages, 5 figures, V2: version accepted for publication in PRD | Phys. Rev. D 103, 044018 (2021) | 10.1103/PhysRevD.103.044018 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we explore wormhole geometries in a recently proposed modified
gravity theory arising from a non-conservative gravitational theory,
tentatively denoted action-dependent Lagrangian theories. The generalized
gravitational field equation essentially depends on a background four-vector
$\lambda^\mu$, that p... | [
{
"created": "Mon, 30 Nov 2020 19:01:31 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jan 2021 11:34:57 GMT",
"version": "v2"
}
] | 2021-02-12 | [
[
"Ayuso",
"Ismael",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Mimoso",
"José P.",
""
]
] | In this work, we explore wormhole geometries in a recently proposed modified gravity theory arising from a non-conservative gravitational theory, tentatively denoted action-dependent Lagrangian theories. The generalized gravitational field equation essentially depends on a background four-vector $\lambda^\mu$, that pla... |
gr-qc/0307019 | Jose Wadih Maluf | J. W. Maluf, F. F. Faria and K. H. Castello-Branco | The gravitational energy-momentum flux | 20 pages, latex file, no figures, two references added, accepted for
publication in Class. Quantum Gravity | Class.Quant.Grav. 20 (2003) 4683-4694 | 10.1088/0264-9381/20/21/008 | null | gr-qc | null | We present a continuity equation for the gravitational energy-momentum, which
is obtained in the framework of the teleparallel equivalent of general
relativity. From this equation it follows a general definition for the
gravitational energy-momentum flux. This definition is investigated in the
context of plane waves ... | [
{
"created": "Fri, 4 Jul 2003 11:16:25 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Aug 2003 13:17:21 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Maluf",
"J. W.",
""
],
[
"Faria",
"F. F.",
""
],
[
"Castello-Branco",
"K. H.",
""
]
] | We present a continuity equation for the gravitational energy-momentum, which is obtained in the framework of the teleparallel equivalent of general relativity. From this equation it follows a general definition for the gravitational energy-momentum flux. This definition is investigated in the context of plane waves an... |
1608.01940 | LVC Publications | The LIGO Scientific Collaboration and the Virgo Collaboration: B. P.
Abbott, R. Abbott, T. D. Abbott, M. R. Abernathy, F. Acernese, K. Ackley, C.
Adams, T. Adams, P. Addesso, R. X. Adhikari, V. B. Adya, C. Affeldt, M.
Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith,
B. Allen, A. All... | The basic physics of the binary black hole merger GW150914 | updated to match published version | LIGO Scientific and Virgo Collaborations, Annalen der Physik,
Volume 529, Issue 1-2, January 2017, 1600209 | 10.1002/andp.201600209 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The first direct gravitational-wave detection was made by the Advanced Laser
Interferometer Gravitational Wave Observatory on September 14, 2015. The
GW150914 signal was strong enough to be apparent, without using any waveform
model, in the filtered detector strain data. Here, features of the signal
visible in the da... | [
{
"created": "Fri, 5 Aug 2016 17:06:57 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Oct 2016 21:12:43 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Feb 2017 13:16:16 GMT",
"version": "v3"
},
{
"created": "Fri, 24 Feb 2017 18:18:21 GMT",
"version": "v4"
}
] | 2017-02-27 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Abernathy",
"M. R.",
""
],
[
"Acernese",
"F... | The first direct gravitational-wave detection was made by the Advanced Laser Interferometer Gravitational Wave Observatory on September 14, 2015. The GW150914 signal was strong enough to be apparent, without using any waveform model, in the filtered detector strain data. Here, features of the signal visible in the data... |
1609.04432 | Stanley Deser | S. Deser | One-loop gravity divergences in D>4 cannot all be removed | Slightly xpanded, published, version | Gen Relativ Gravit (2016) 48:157 | 10.1007/s10714-016-2151-1 | BRX-TH6308, CALT-TH2016-026 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unlike the one-loop QG divergences in D=4, which can all be transformed away,
those in arbitrary higher (even) dimension cannot.
| [
{
"created": "Wed, 14 Sep 2016 20:22:31 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2016 07:43:57 GMT",
"version": "v2"
}
] | 2016-11-24 | [
[
"Deser",
"S.",
""
]
] | Unlike the one-loop QG divergences in D=4, which can all be transformed away, those in arbitrary higher (even) dimension cannot. |
1512.03392 | Sarp Akcay | Sarp Akcay and Maarten van de Meent | Numerical computation of the EOB potential q using self-force results | 4 figures, numerical data at the end. Fixed the typos, added the
journal reference | Phys. Rev. D 93, 064063 (2016) | 10.1103/PhysRevD.93.064063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective-one-body theory (EOB) describes the conservative dynamics of
compact binary systems in terms of an effective Hamiltonian approach. The
Hamiltonian for moderately eccentric motion of two non-spinning compact objects
in the extreme mass-ratio limit is given in terms of three potentials: $a(v),
\bar{d}(v),... | [
{
"created": "Wed, 9 Dec 2015 20:11:54 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Mar 2016 11:22:45 GMT",
"version": "v2"
}
] | 2016-03-30 | [
[
"Akcay",
"Sarp",
""
],
[
"van de Meent",
"Maarten",
""
]
] | The effective-one-body theory (EOB) describes the conservative dynamics of compact binary systems in terms of an effective Hamiltonian approach. The Hamiltonian for moderately eccentric motion of two non-spinning compact objects in the extreme mass-ratio limit is given in terms of three potentials: $a(v), \bar{d}(v), q... |
2003.00941 | Luisa Bonolis PhD | Luisa Bonolis and Juan-Andres Leon | Gravitational-wave research as an emerging field in the Max Planck
Society. The long roots of GEO600 and of the Albert Einstein Institute | 94 pages. Enlarged version including new results from further
archival research. A previous version appears as a chapter in the volume The
Renaissance of General Relativity in Context, edited by A. Blum, R. Lalli and
J. Renn (Boston: Birkhauser, 2020) | null | 10.1007/978-3-030-50754-1 | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the occasion of the 50th anniversary since the beginning of the search for
gravitational waves at the Max Planck Society, and in coincidence with the 25th
anniversary of the foundation of the Albert Einstein Institute, we explore the
interplay between the renaissance of general relativity and the advent of
relativ... | [
{
"created": "Mon, 2 Mar 2020 14:35:59 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2020 17:43:31 GMT",
"version": "v2"
}
] | 2020-10-30 | [
[
"Bonolis",
"Luisa",
""
],
[
"Leon",
"Juan-Andres",
""
]
] | On the occasion of the 50th anniversary since the beginning of the search for gravitational waves at the Max Planck Society, and in coincidence with the 25th anniversary of the foundation of the Albert Einstein Institute, we explore the interplay between the renaissance of general relativity and the advent of relativis... |
1812.01881 | Boris Latosh | B. Latosh | Fab Four Effective Field Theory Treatment | 11 pages | Eur. Phys. J. C (2018) 78: 991 | 10.1140/epjc/s10052-018-6470-0 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The article addresses the John interaction from Fab Four class of Horndeski
models from the effective field theory point of view. Models with this
interaction are heavily constrained by gravitational wave speed observations,
so it is important to understand, if these constraints hold in the effective
field theory fra... | [
{
"created": "Wed, 5 Dec 2018 09:57:24 GMT",
"version": "v1"
}
] | 2018-12-06 | [
[
"Latosh",
"B.",
""
]
] | The article addresses the John interaction from Fab Four class of Horndeski models from the effective field theory point of view. Models with this interaction are heavily constrained by gravitational wave speed observations, so it is important to understand, if these constraints hold in the effective field theory frame... |
1902.08997 | Fabio D'Ambrosio | Fabio D'Ambrosio | A Noether Theorem for discrete Covariant Mechanics | 11 pages, 2 figures | null | null | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Noether's theorem is an elegant and powerful tool of classical mechanics, but
it is of little to no consequence in discrete theories. Here we define and
explore a discrete approach to covariant mechanics and show that within this
framework a discrete version of Noether's theorem, completely analogous to the
well-know... | [
{
"created": "Sun, 24 Feb 2019 19:29:50 GMT",
"version": "v1"
}
] | 2019-02-26 | [
[
"D'Ambrosio",
"Fabio",
""
]
] | Noether's theorem is an elegant and powerful tool of classical mechanics, but it is of little to no consequence in discrete theories. Here we define and explore a discrete approach to covariant mechanics and show that within this framework a discrete version of Noether's theorem, completely analogous to the well-known ... |
gr-qc/0305063 | Parampreet Singh | Jeeva Anandan, Naresh Dadhich, Parampreet Singh | Action based approach to the dynamics of extended bodies in General
Relativity | This essay received an ``honorable mention'' in the 2003 Gravity
Research Foundation essay competition | Int.J.Mod.Phys. D12 (2003) 1651-1656 | 10.1142/S0218271803003931 | null | gr-qc astro-ph hep-th quant-ph | null | We present, for the first time, an action principle that gives the equations
of motion of an extended body possessing multipole moments in an external
gravitational field, in the weak field limit. From the action, the
experimentally observable quantum phase shifts in the wavefunction of an
extended object due to the ... | [
{
"created": "Fri, 16 May 2003 06:46:29 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Anandan",
"Jeeva",
""
],
[
"Dadhich",
"Naresh",
""
],
[
"Singh",
"Parampreet",
""
]
] | We present, for the first time, an action principle that gives the equations of motion of an extended body possessing multipole moments in an external gravitational field, in the weak field limit. From the action, the experimentally observable quantum phase shifts in the wavefunction of an extended object due to the co... |
2308.05719 | Supragyan Priyadarshinee | Supragyan Priyadarshinee | Quasi-normal mode of dyonic hairy black hole and its interplay with
phase transitions | 29 pages, 45 Figures. arXiv admin note: text overlap with
arXiv:2108.02514 | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the dynamical stability of hairy dyonic black holes in the
Einstein-Maxwell-scalar gravity system against the massless scalar field
perturbation. We numerically obtain the corresponding quasinormal modes (QNMs)
using the series solution and shooting methods for various black hole
parameters. We find that the... | [
{
"created": "Thu, 10 Aug 2023 17:35:01 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Aug 2023 11:28:05 GMT",
"version": "v2"
}
] | 2023-08-14 | [
[
"Priyadarshinee",
"Supragyan",
""
]
] | We study the dynamical stability of hairy dyonic black holes in the Einstein-Maxwell-scalar gravity system against the massless scalar field perturbation. We numerically obtain the corresponding quasinormal modes (QNMs) using the series solution and shooting methods for various black hole parameters. We find that the n... |
gr-qc/9512038 | Daniel Mueller S. | Daniel Mueller | A Semi-Analytical Method for the Evaluation of the Power Spectrum of a
Rotating Observer | 6 pages, 4 figures | null | null | null | gr-qc | null | In this letter we propose a semi-analitical method of evaluation of the power
spectrum of a circular moving Unruh-type detector using the method of residue
and compare the spectrum with the already known result in the relativistic
limit.
| [
{
"created": "Wed, 20 Dec 1995 22:20:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mueller",
"Daniel",
""
]
] | In this letter we propose a semi-analitical method of evaluation of the power spectrum of a circular moving Unruh-type detector using the method of residue and compare the spectrum with the already known result in the relativistic limit. |
2001.05909 | Jiong Lin | Jiong Lin, Qing Gao, Yungui Gong, Yizhou Lu, Chao Zhang, Fengge Zhang | Primordial black holes and secondary gravitational waves from k/G
inflation | null | Phys. Rev. D 101, 103515 (2020) | 10.1103/PhysRevD.101.103515 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility that in the mass range around $10^{-12}\ M_\odot$ most of
dark matter constitutes of primordial black holes (PBHs) is a very interesting
topic. To produce PBHs with this mass, the primordial scalar power spectrum
needs to be enhanced to the order of 0.01 at the scale $k\sim 10^{12}\
\text{Mpc}^{-1}$. ... | [
{
"created": "Thu, 16 Jan 2020 15:53:44 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Apr 2020 10:05:27 GMT",
"version": "v2"
}
] | 2020-05-15 | [
[
"Lin",
"Jiong",
""
],
[
"Gao",
"Qing",
""
],
[
"Gong",
"Yungui",
""
],
[
"Lu",
"Yizhou",
""
],
[
"Zhang",
"Chao",
""
],
[
"Zhang",
"Fengge",
""
]
] | The possibility that in the mass range around $10^{-12}\ M_\odot$ most of dark matter constitutes of primordial black holes (PBHs) is a very interesting topic. To produce PBHs with this mass, the primordial scalar power spectrum needs to be enhanced to the order of 0.01 at the scale $k\sim 10^{12}\ \text{Mpc}^{-1}$. Th... |
gr-qc/0102059 | Bijan Saha | Bijan Saha (LIT, JINR) and G.N. Shikin (RPFU) | On the role of $\Lambda$-term in the evolution of Bianchi-I cosmological
model with nonlinear spinor field | RevTex, 4 pages | PFU Reports: Physics, N 8, issue 1, (2000) 17-20 | null | null | gr-qc | null | Self-consistent solutions to nonlinear spinor field equations in General
Relativity are studied for the case of Bianchi type-I space-time. It has been
shown that introduction of $\Lambda$-term in the Lagrangian generates
oscillations of the Bianchi type-I model.
| [
{
"created": "Tue, 13 Feb 2001 12:57:48 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Saha",
"Bijan",
"",
"LIT, JINR"
],
[
"Shikin",
"G. N.",
"",
"RPFU"
]
] | Self-consistent solutions to nonlinear spinor field equations in General Relativity are studied for the case of Bianchi type-I space-time. It has been shown that introduction of $\Lambda$-term in the Lagrangian generates oscillations of the Bianchi type-I model. |
1910.06889 | Isha Kotecha | Mehdi Assanioussi and Isha Kotecha | Thermal representations in group field theory: squeezed vacua and
quantum gravity condensates | v2, 11 pages, minor revisions, published version; v1, 10 pages | JHEP 2020, 173 (2020) | 10.1007/JHEP02(2020)173 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the formalism of thermofield dynamics to group field theory quantum
gravity and construct thermal representations associated with generalised
equilibrium Gibbs states using Bogoliubov transformations. The newly
constructed class of thermal vacua are entangled, two-mode squeezed,
thermofield double states. Th... | [
{
"created": "Tue, 15 Oct 2019 16:05:10 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2020 18:51:46 GMT",
"version": "v2"
}
] | 2020-03-03 | [
[
"Assanioussi",
"Mehdi",
""
],
[
"Kotecha",
"Isha",
""
]
] | We apply the formalism of thermofield dynamics to group field theory quantum gravity and construct thermal representations associated with generalised equilibrium Gibbs states using Bogoliubov transformations. The newly constructed class of thermal vacua are entangled, two-mode squeezed, thermofield double states. The ... |
1903.08844 | LSC P&P Committee | The LIGO Scientific Collaboration and the Virgo Collaboration: B. P.
Abbott, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, C.
Adams, R. X. Adhikari, V. B. Adya, C. Affeldt, M. Agathos, K. Agatsuma, N.
Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, G. Allen, A. Allocca, M.
A. Aloy, P. A. Alt... | Directional limits on persistent gravitational waves using data from
Advanced LIGO's first two observing runs | 15 pages, 5 figures | Phys. Rev. D 100, 062001 (2019) | 10.1103/PhysRevD.100.062001 | LIGO-P1900053 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform an unmodeled search for persistent, directional gravitational wave
(GW) sources using data from the first and second observing runs of Advanced
LIGO. We do not find evidence for any GW signals. We place limits on the
broadband GW flux emitted at 25~Hz from point sources with a power law spectrum
at $F_{\al... | [
{
"created": "Thu, 21 Mar 2019 06:30:00 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2019 07:55:49 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Sep 2019 06:17:36 GMT",
"version": "v3"
}
] | 2019-09-11 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Abraham",
"S.",
""
],
[
"Acernese",
"F.",
... | We perform an unmodeled search for persistent, directional gravitational wave (GW) sources using data from the first and second observing runs of Advanced LIGO. We do not find evidence for any GW signals. We place limits on the broadband GW flux emitted at 25~Hz from point sources with a power law spectrum at $F_{\alph... |
2108.02738 | Martina Muratore | Martina Muratore, Daniele Vetrugno, Stefano Vitale and Olaf Hartwig | Time Delay Interferometry combinations as instrument noise monitors for
LISA | null | null | 10.1103/PhysRevD.105.023009 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LISA mission will likely be a signal dominated detector, such that one
challenge is the separation of the different astrophysical sources, and to
distinguish between them and the instrumental noise. One of the goals of LISA
is to probe the early Universe by detecting stochastic GW backgrounds. As
correlation with... | [
{
"created": "Thu, 5 Aug 2021 16:58:09 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Nov 2021 11:20:38 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Jan 2022 17:46:16 GMT",
"version": "v3"
}
] | 2022-01-19 | [
[
"Muratore",
"Martina",
""
],
[
"Vetrugno",
"Daniele",
""
],
[
"Vitale",
"Stefano",
""
],
[
"Hartwig",
"Olaf",
""
]
] | The LISA mission will likely be a signal dominated detector, such that one challenge is the separation of the different astrophysical sources, and to distinguish between them and the instrumental noise. One of the goals of LISA is to probe the early Universe by detecting stochastic GW backgrounds. As correlation with o... |
gr-qc/9609032 | Carlo Baccigalupi | Luca Amendola, Carlo Baccigalupi, Franco Occhionero | Reconciling inflation with openness | 4 pages, one postscript figure, to be published on Physical Review D
PACS: 98.80. Cq | Phys.Rev. D54 (1996) 4760-4763 | 10.1103/PhysRevD.54.4760 | null | gr-qc | null | It is already understood that the increasing observational evidence for an
open Universe can be reconciled with inflation if our horizon is contained
inside one single huge bubble nucleated during the inflationary phase
transition. In this frame of ideas, we show here that the probability of living
in a bubble with t... | [
{
"created": "Thu, 12 Sep 1996 16:02:47 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Amendola",
"Luca",
""
],
[
"Baccigalupi",
"Carlo",
""
],
[
"Occhionero",
"Franco",
""
]
] | It is already understood that the increasing observational evidence for an open Universe can be reconciled with inflation if our horizon is contained inside one single huge bubble nucleated during the inflationary phase transition. In this frame of ideas, we show here that the probability of living in a bubble with the... |
2007.14794 | Zixu Zhao | Zixu Zhao, Shuhang Zhang, Qiyuan Pan, Jiliang Jing | Estimation precision of parameter associated with Unruh-like effect | 17 pages, 14 figures. arXiv admin note: substantial text overlap with
arXiv:2007.13389 | Nucl. Phys. B 967(2021)115408 | 10.1016/j.nuclphysb.2021.115408 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum Fisher information (QFI) of acceleration, in the open
quantum systems, for a two-level atom with the circular motion coupled to a
massless scalar field in the Minkowski vacuum without and with a reflecting
boundary in the ultra-relativistic limit. As we amplify $a$, the saturation
time decreases ... | [
{
"created": "Tue, 28 Jul 2020 03:05:52 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Sep 2020 09:49:30 GMT",
"version": "v2"
},
{
"created": "Sun, 2 May 2021 13:55:42 GMT",
"version": "v3"
},
{
"created": "Tue, 4 May 2021 00:37:34 GMT",
"version": "v4"
}
] | 2021-05-05 | [
[
"Zhao",
"Zixu",
""
],
[
"Zhang",
"Shuhang",
""
],
[
"Pan",
"Qiyuan",
""
],
[
"Jing",
"Jiliang",
""
]
] | We study the quantum Fisher information (QFI) of acceleration, in the open quantum systems, for a two-level atom with the circular motion coupled to a massless scalar field in the Minkowski vacuum without and with a reflecting boundary in the ultra-relativistic limit. As we amplify $a$, the saturation time decreases fo... |
2308.11040 | Leda Gao | Leda Gao, Paul R. Anderson, Robert S. Link | Backreaction and order reduction in initially contracting models of the
universe | 58 pages, 19 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The semiclassical backreaction equations are solved in closed
Robertson-Walker spacetimes containing a positive cosmological constant and a
conformally coupled massive scalar field. Renormalization of the stress-energy
tensor results in higher derivative terms that can lead to solutions that vary
on much shorter time... | [
{
"created": "Mon, 21 Aug 2023 21:01:20 GMT",
"version": "v1"
}
] | 2023-08-23 | [
[
"Gao",
"Leda",
""
],
[
"Anderson",
"Paul R.",
""
],
[
"Link",
"Robert S.",
""
]
] | The semiclassical backreaction equations are solved in closed Robertson-Walker spacetimes containing a positive cosmological constant and a conformally coupled massive scalar field. Renormalization of the stress-energy tensor results in higher derivative terms that can lead to solutions that vary on much shorter time s... |
gr-qc/0303081 | Pierre Teyssandier | Pierre Teyssandier | Variation of the speed of light due to non-minimal coupling between
electromagnetism and gravity | Invited lecture given at the Meeting on Electromagnetism organized by
the Fondation Louis de Broglie in Peyresq, September 2-7, 2002; 13 pages. The
new version gives the explicit definition of $\tilde{a}$ in Theorem 1 | Annales Fond.Broglie 29 (2004) 173 | null | null | gr-qc | null | We consider an Einstein-Maxwell action modified by the addition of three
terms coupling the electromagnetic strength to the curvature tensor. The
corresponding generalized Maxwell equations imply a variation of the speed of
light in a vacuum. We determine this variation in Friedmann-Robertson-Walker
spacetimes. We sh... | [
{
"created": "Thu, 20 Mar 2003 17:23:37 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Mar 2003 09:52:02 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Apr 2003 17:23:05 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Teyssandier",
"Pierre",
""
]
] | We consider an Einstein-Maxwell action modified by the addition of three terms coupling the electromagnetic strength to the curvature tensor. The corresponding generalized Maxwell equations imply a variation of the speed of light in a vacuum. We determine this variation in Friedmann-Robertson-Walker spacetimes. We show... |
2003.11169 | Nikolaos Mavromatos | Nikolaos E. Mavromatos (King's College London) | Gravitational Anomalies in string-inspired Cosmologies: from Inflation
to Axion Dark Matter? | 16 pages latex, uses special macros. Invited talk in Corfu Summer
Institute 2019 "School and Workshops on Elementary Particle Physics and
Gravity" (CORFU2019), based on arXiv:1905.04685 [hep-th], arXiv:1907.04890
[hep-ph] and arXiv:2001.03465 [gr-qc], with which there may be partial text
overlap | null | null | KCL-PH-TH/2020-13 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I review briefly a scenario for the evolution of a
string-inspired cosmological model, in which condensates of primordial
gravitational waves (GW), formed at the very early eras after the Big Bang, are
considered responsible for inducing inflation and then a smooth exit to a
radiation dominated epoch. P... | [
{
"created": "Wed, 25 Mar 2020 01:03:26 GMT",
"version": "v1"
}
] | 2020-03-26 | [
[
"Mavromatos",
"Nikolaos E.",
"",
"King's College London"
]
] | In this talk, I review briefly a scenario for the evolution of a string-inspired cosmological model, in which condensates of primordial gravitational waves (GW), formed at the very early eras after the Big Bang, are considered responsible for inducing inflation and then a smooth exit to a radiation dominated epoch. Pri... |
1201.4092 | Pankaj Sharan | Pankaj Sharan | Covariant Extended Phase Space for Fields on Curved Background | 19 pages. arXiv admin note: substantial text overlap with
arXiv:1104.5095 | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the nature of physical time requires the extended
phase-space in mechanics to have a bundle structure with time as the
1-dimensional base manifold and the phase space as the fiber. This bundle
picture of the extended phase space is then applied to fields in a covariant,
`directly' Hamiltonian formali... | [
{
"created": "Thu, 19 Jan 2012 16:03:09 GMT",
"version": "v1"
}
] | 2012-01-20 | [
[
"Sharan",
"Pankaj",
""
]
] | It is shown that the nature of physical time requires the extended phase-space in mechanics to have a bundle structure with time as the 1-dimensional base manifold and the phase space as the fiber. This bundle picture of the extended phase space is then applied to fields in a covariant, `directly' Hamiltonian formalism... |
1009.1958 | Francisco Lobo | Tiberiu Harko, Zolt\'an Kov\'acs, Francisco S.N. Lobo | Thin accretion disk signatures of slowly rotating black holes in
Ho\v{r}ava gravity | 12 pages, 15 figures. V2: 13 pages, clarifications and discussion
added; version accepted for publication in Classical and Quantum Gravity | Class.Quant.Grav.28:165001,2011 | 10.1088/0264-9381/28/16/165001 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we consider the possibility of observationally testing
Ho\v{r}ava gravity by using the accretion disk properties around slowly
rotating black holes of the Kehagias-Sfetsos solution in asymptotically flat
spacetimes. The energy flux, temperature distribution, the emission spectrum as
well as the e... | [
{
"created": "Fri, 10 Sep 2010 08:43:32 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2011 08:57:49 GMT",
"version": "v2"
}
] | 2011-07-12 | [
[
"Harko",
"Tiberiu",
""
],
[
"Kovács",
"Zoltán",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In the present work, we consider the possibility of observationally testing Ho\v{r}ava gravity by using the accretion disk properties around slowly rotating black holes of the Kehagias-Sfetsos solution in asymptotically flat spacetimes. The energy flux, temperature distribution, the emission spectrum as well as the ene... |
1903.05626 | Badri Krishnan | Daniel Pook-Kolb, Ofek Birnholtz, Badri Krishnan and Erik Schnetter | The interior of a binary black hole merger | 6 Pages, 7 Figures | Phys. Rev. Lett. 123, 171102 (2019) | 10.1103/PhysRevLett.123.171102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find strong numerical evidence for a new phenomenon in a binary black hole
spacetime, namely the merger of marginally outer trapped surfaces (MOTSs). By
simulating the head-on collision of two non-spinning unequal mass black holes,
we observe that the MOTS associated with the final black hole merges with the
two i... | [
{
"created": "Wed, 13 Mar 2019 17:46:42 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2019 20:57:19 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Oct 2019 07:28:39 GMT",
"version": "v3"
}
] | 2019-10-23 | [
[
"Pook-Kolb",
"Daniel",
""
],
[
"Birnholtz",
"Ofek",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Schnetter",
"Erik",
""
]
] | We find strong numerical evidence for a new phenomenon in a binary black hole spacetime, namely the merger of marginally outer trapped surfaces (MOTSs). By simulating the head-on collision of two non-spinning unequal mass black holes, we observe that the MOTS associated with the final black hole merges with the two ini... |
1008.0767 | Mark Israelit | Mark Israelit (University of Haifa-Oranim) | A Weyl-Dirac Cosmological Model with DM and DE | 25 pages. Submitted to GRG | Gen.Rel.Grav.43:751-775,2011 | 10.1007/s10714-010-1092-3 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Weyl-Dirac (W-D) framework a spatially closed cosmological model is
considered. It is assumed that the space-time of the universe has a chaotic
Weylian microstructure but is described on a large scale by Riemannian
geometry. Locally fields of the Weyl connection vector act as creators of
massive bosons having ... | [
{
"created": "Wed, 4 Aug 2010 12:40:37 GMT",
"version": "v1"
}
] | 2011-02-23 | [
[
"Israelit",
"Mark",
"",
"University of Haifa-Oranim"
]
] | In the Weyl-Dirac (W-D) framework a spatially closed cosmological model is considered. It is assumed that the space-time of the universe has a chaotic Weylian microstructure but is described on a large scale by Riemannian geometry. Locally fields of the Weyl connection vector act as creators of massive bosons having sp... |
gr-qc/0301121 | V. Folomeev | V.N. Folomeev | Quantum Evolution of the Dilaton-Inflaton Model | 11 pages, 4 figures | null | null | null | gr-qc | null | The quantum evolution of a model of the universe with account of two scalar
fields ({\it dilaton} and {\it inflaton}) is considered. For this case, the
closed and flat models has been examined. It is shown that in both cases the
realization of conditions necessary for inflation is strongly depends on
coupling constan... | [
{
"created": "Thu, 30 Jan 2003 10:25:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Folomeev",
"V. N.",
""
]
] | The quantum evolution of a model of the universe with account of two scalar fields ({\it dilaton} and {\it inflaton}) is considered. For this case, the closed and flat models has been examined. It is shown that in both cases the realization of conditions necessary for inflation is strongly depends on coupling constant ... |
gr-qc/9604020 | Shingo Suzuki | Shingo Suzuki and Kei-ichi Maeda | Chaos in Schwarzschild Spacetime : The Motion of a Spinning Particle | 18 pages, revtex, 9 figures(figures are available on request) | Phys.Rev. D55 (1997) 4848-4859 | 10.1103/PhysRevD.55.4848 | WU-AP/59/96 | gr-qc astro-ph | null | We study the motion of a spinning test particle in Schwarzschild spacetime,
analyzing the Poincar\'e map and the Lyapunov exponent. We find chaotic
behavior for a particle with spin higher than some critical value (e.g. $S_{cr}
\sim 0.64 \mu M$ for the total angular momentum $J=4 \mu M$), where $\mu$ and
$M$ are the ... | [
{
"created": "Tue, 9 Apr 1996 07:15:31 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Suzuki",
"Shingo",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We study the motion of a spinning test particle in Schwarzschild spacetime, analyzing the Poincar\'e map and the Lyapunov exponent. We find chaotic behavior for a particle with spin higher than some critical value (e.g. $S_{cr} \sim 0.64 \mu M$ for the total angular momentum $J=4 \mu M$), where $\mu$ and $M$ are the ma... |
1703.08552 | Fulvio Scaccabarozzi | Fulvio Scaccabarozzi and Jaiyul Yoo (Z\"urich) | Light-Cone Observables and Gauge-Invariance in the Geodesic Light-Cone
Formalism | 25 pages, no figures, published in JCAP | JCAP06(2017)007 | 10.1088/1475-7516/2017/06/007 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The remarkable properties of the geodesic light-cone (GLC) coordinates allow
analytic expressions for the light-cone observables, providing a new
non-perturbative way for calculating the effects of inhomogeneities in our
Universe. However, the gauge-invariance of these expressions in the GLC
formalism has not been sh... | [
{
"created": "Fri, 24 Mar 2017 18:00:22 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2017 08:00:59 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"Scaccabarozzi",
"Fulvio",
"",
"Zürich"
],
[
"Yoo",
"Jaiyul",
"",
"Zürich"
]
] | The remarkable properties of the geodesic light-cone (GLC) coordinates allow analytic expressions for the light-cone observables, providing a new non-perturbative way for calculating the effects of inhomogeneities in our Universe. However, the gauge-invariance of these expressions in the GLC formalism has not been show... |
1001.2919 | Etera R. Livine | Florian Girelli, Etera R. Livine | A Deformed Poincare Invariance for Group Field Theories | 11 pages | Class. Quantum Grav. 27 (2010) 245018 | 10.1088/0264-9381/27/24/245018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of quantum gravity, group field theories are field theories
that generate spinfoam amplitudes as Feynman diagrams. They can be understood
as generalizations of the matrix models used for 2d quantum gravity. In
particular Boulatov's theory reproduces the amplitudes of the Ponzano-Regge
spinfoam model fo... | [
{
"created": "Sun, 17 Jan 2010 19:24:29 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Girelli",
"Florian",
""
],
[
"Livine",
"Etera R.",
""
]
] | In the context of quantum gravity, group field theories are field theories that generate spinfoam amplitudes as Feynman diagrams. They can be understood as generalizations of the matrix models used for 2d quantum gravity. In particular Boulatov's theory reproduces the amplitudes of the Ponzano-Regge spinfoam model for ... |
1608.08951 | Christopher Berry | Christopher P. L. Berry, Robert H. Cole, Priscilla Ca\~nizares and
Jonathan R. Gair | Importance of transient resonances in extreme-mass-ratio inspirals | 24 pages, 12 figures, 2 appendices; changes to match published
version | Phys. Rev. D 94, 124042 (2016) | 10.1103/PhysRevD.94.124042 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inspiral of stellar-mass compact objects, like neutron stars or
stellar-mass black holes, into supermassive black holes provides a wealth of
information about the strong gravitational-field regime via the emission of
gravitational waves. In order to detect and analyse these signals, accurate
waveform templates wh... | [
{
"created": "Wed, 31 Aug 2016 17:19:16 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jan 2017 11:09:44 GMT",
"version": "v2"
}
] | 2017-01-13 | [
[
"Berry",
"Christopher P. L.",
""
],
[
"Cole",
"Robert H.",
""
],
[
"Cañizares",
"Priscilla",
""
],
[
"Gair",
"Jonathan R.",
""
]
] | The inspiral of stellar-mass compact objects, like neutron stars or stellar-mass black holes, into supermassive black holes provides a wealth of information about the strong gravitational-field regime via the emission of gravitational waves. In order to detect and analyse these signals, accurate waveform templates whic... |
2405.05970 | Kwinten Fransen | Kwinten Fransen and Steven B. Giddings | Gravitational wave signatures of departures from classical black hole
scattering | 28 + 5 pages, 5 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We initiate a general investigation into gravitational wave signatures of
modifications to scattering of gravitational radiation from black holes. Such
modifications may be present due to the quantum dynamics that makes black holes
consistent with quantum mechanics, or in other models for departures from
classical bl... | [
{
"created": "Thu, 9 May 2024 17:59:56 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2024 18:00:00 GMT",
"version": "v2"
}
] | 2024-06-07 | [
[
"Fransen",
"Kwinten",
""
],
[
"Giddings",
"Steven B.",
""
]
] | We initiate a general investigation into gravitational wave signatures of modifications to scattering of gravitational radiation from black holes. Such modifications may be present due to the quantum dynamics that makes black holes consistent with quantum mechanics, or in other models for departures from classical blac... |
2310.00315 | Deyou Chen | Yucheng He, Zeqiang Wang, Deyou Chen | Report on chaos bound outside Taub-NUT black holes | 13 pages | Physics of the Dark Universe, 42 (2023) 101325 | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Positions of a charged particle's equilibrium orbits and spatial regions
where the chaos bound is violated are found through circular motions of the
particle around charged Taub-NUT black holes. Lyapunov exponent is gotten by
calculating eigenvalues of a Jacobian matrix in a phase space $(r,\pi_r)$. When
the particle... | [
{
"created": "Sat, 30 Sep 2023 09:10:33 GMT",
"version": "v1"
}
] | 2023-10-03 | [
[
"He",
"Yucheng",
""
],
[
"Wang",
"Zeqiang",
""
],
[
"Chen",
"Deyou",
""
]
] | Positions of a charged particle's equilibrium orbits and spatial regions where the chaos bound is violated are found through circular motions of the particle around charged Taub-NUT black holes. Lyapunov exponent is gotten by calculating eigenvalues of a Jacobian matrix in a phase space $(r,\pi_r)$. When the particle's... |
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