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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1602.07723 | Jo\~ao Lu\'is Rosa | Jo\~ao Lu\'is de Figueiredo Rosa | Superradiant amplification by stars and black holes | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis we study the phenomenon of superradiance and its implications
to the stability of black-holes (BH) and perfect-fluid stars.
Superradiance is a radiation enhancement process that involves rotating
dissipative systems. In BH spacetimes, superradiance is due to dissipation at
the event horizon, with int... | [
{
"created": "Wed, 24 Feb 2016 21:43:35 GMT",
"version": "v1"
}
] | 2016-02-26 | [
[
"Rosa",
"João Luís de Figueiredo",
""
]
] | In this thesis we study the phenomenon of superradiance and its implications to the stability of black-holes (BH) and perfect-fluid stars. Superradiance is a radiation enhancement process that involves rotating dissipative systems. In BH spacetimes, superradiance is due to dissipation at the event horizon, with interes... |
1104.0387 | Richard Price | Richard H. Price, Gaurav Khanna, Scott A. Hughes | Systematics of black hole binary inspiral kicks and the slowness
approximation | 15 pages, 6 figures, 2 tables | Phys.Rev.D83:124002,2011 | 10.1103/PhysRevD.83.124002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During the inspiral and merger of black holes, the interaction of
gravitational wave multipoles carries linear momentum away, thereby providing
an astrophysically important recoil, or "kick" to the system and to the final
black hole remnant. It has been found that linear momentum during the last
stage (quasinormal ri... | [
{
"created": "Sun, 3 Apr 2011 15:00:35 GMT",
"version": "v1"
}
] | 2011-06-13 | [
[
"Price",
"Richard H.",
""
],
[
"Khanna",
"Gaurav",
""
],
[
"Hughes",
"Scott A.",
""
]
] | During the inspiral and merger of black holes, the interaction of gravitational wave multipoles carries linear momentum away, thereby providing an astrophysically important recoil, or "kick" to the system and to the final black hole remnant. It has been found that linear momentum during the last stage (quasinormal ring... |
2407.11355 | Yongqiang Wang | Long-Xing Huang, Shi-Xian Sun, Yong-Qiang Wang | Bardeen spacetime with charged scalar field | 20 pages, 6 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Ref. \cite{Wang:2023tdz} investigated the model of Einstein-Bardeen
theory coupled to a free complex scalar field. The introduction of the scalar
field prevents the formation of the event horizon, and when the magnetic charge
exceeds a certain critical value, the frozen Bardeen-boson star can be obtained
wi... | [
{
"created": "Tue, 16 Jul 2024 03:41:32 GMT",
"version": "v1"
}
] | 2024-07-17 | [
[
"Huang",
"Long-Xing",
""
],
[
"Sun",
"Shi-Xian",
""
],
[
"Wang",
"Yong-Qiang",
""
]
] | Recently, Ref. \cite{Wang:2023tdz} investigated the model of Einstein-Bardeen theory coupled to a free complex scalar field. The introduction of the scalar field prevents the formation of the event horizon, and when the magnetic charge exceeds a certain critical value, the frozen Bardeen-boson star can be obtained with... |
1310.3632 | Betti Hartmann | Betti Hartmann (JUB, Germany), Burkhard Kleihaus, Jutta Kunz and
Isabell Schaffer (University Oldenburg, Germany) | Compact (A)dS Boson Stars and Shells | 18 pages including 10 figures | Phys. Rev. D88 (2013) 124033 | 10.1103/PhysRevD.88.124033 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present compact Q-balls in an (Anti-)de Sitter background in D dimensions,
obtained with a V-shaped potential of the scalar field. Beyond critical values
of the cosmological constant compact Q-shells arise. By including the
gravitational back-reaction, we obtain boson stars and boson shells with
(Anti-)de Sitter a... | [
{
"created": "Mon, 14 Oct 2013 11:26:36 GMT",
"version": "v1"
}
] | 2014-12-10 | [
[
"Hartmann",
"Betti",
"",
"JUB, Germany"
],
[
"Kleihaus",
"Burkhard",
"",
"University Oldenburg, Germany"
],
[
"Kunz",
"Jutta",
"",
"University Oldenburg, Germany"
],
[
"Schaffer",
"Isabell",
"",
"University Oldenburg, Germany"
]
] | We present compact Q-balls in an (Anti-)de Sitter background in D dimensions, obtained with a V-shaped potential of the scalar field. Beyond critical values of the cosmological constant compact Q-shells arise. By including the gravitational back-reaction, we obtain boson stars and boson shells with (Anti-)de Sitter asy... |
gr-qc/0101055 | O. B. Zaslavskii | O.B. Zaslavskii | Entropy of massive fields near a black hole and vacuum polarization:
thermodynamics without statistical mechanics | 11 pages, REVTeX 3.0. To be published in Phys. Lett. B | Phys.Lett. B501 (2001) 277-282 | 10.1016/S0370-2693(01)00148-4 | null | gr-qc hep-th | null | Starting from the Frolov-Zel'nikov stress-energy tensor of quantum massive
fields in the Schwarzschild background, we recover the contribution $S_{q}$ of
these field into the entropy of a black hole. For fermions with the spin
$%s=1/2$ $S_{q}>0$, for scalar fields $S_{q}>0$ provided the coupling parameter
is restrict... | [
{
"created": "Sun, 14 Jan 2001 20:33:50 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Zaslavskii",
"O. B.",
""
]
] | Starting from the Frolov-Zel'nikov stress-energy tensor of quantum massive fields in the Schwarzschild background, we recover the contribution $S_{q}$ of these field into the entropy of a black hole. For fermions with the spin $%s=1/2$ $S_{q}>0$, for scalar fields $S_{q}>0$ provided the coupling parameter is restricted... |
gr-qc/9708004 | Valery Rupasov | I E Bulyzhenkov | Double unification, time compression, and space flatness for the
extended particle | 34 pages, Latex | null | null | null | gr-qc | null | Three variational vector equations are derived for the extended
particle-field object located on the light cone. Point sources are excluded
from the pure field equations and all physical magnitudes are free from
divergences. Accepting 3D intersections of 4D cone-charges, vector
electrogravity explains all observed ph... | [
{
"created": "Sun, 3 Aug 1997 18:15:07 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Dec 1999 08:04:31 GMT",
"version": "v2"
},
{
"created": "Tue, 16 May 2000 05:24:25 GMT",
"version": "v3"
},
{
"created": "Mon, 16 Oct 2000 01:19:49 GMT",
"version": "v4"
}
] | 2008-02-03 | [
[
"Bulyzhenkov",
"I E",
""
]
] | Three variational vector equations are derived for the extended particle-field object located on the light cone. Point sources are excluded from the pure field equations and all physical magnitudes are free from divergences. Accepting 3D intersections of 4D cone-charges, vector electrogravity explains all observed phen... |
gr-qc/0401099 | Lee Carson Loveridge | Lee C. Loveridge | Physical and Geometric Interpretations of the Riemann Tensor, Ricci
Tensor, and Scalar Curvature | 18 pages with appendices, no figures | null | null | null | gr-qc | null | Various interpretations of the Riemann Curvature Tensor, Ricci Tensor, and
Scalar Curvature are described. Also, the physical meanings of the Einstein
Tensor and Einstein's Equations are discussed. Finally a derivation of
Newtonian Gravity from Einstein's Equations is given.
| [
{
"created": "Fri, 23 Jan 2004 20:55:31 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Loveridge",
"Lee C.",
""
]
] | Various interpretations of the Riemann Curvature Tensor, Ricci Tensor, and Scalar Curvature are described. Also, the physical meanings of the Einstein Tensor and Einstein's Equations are discussed. Finally a derivation of Newtonian Gravity from Einstein's Equations is given. |
gr-qc/9803025 | Mora Ley Cesar Eduardo | Luis O. Pimentel and C\'esar Mora (Universidad Aut\'onoma
Metropolitana.) | Quantum Cosmology in some Scalar-tensor Theories | Latex file, 3 pp., uses mprocl.sty. To be published in the
Proceedings of the Eight Marcel Grossmann Meeting (World Scientific 1998) | null | null | null | gr-qc | null | The Wheeler-DeWitt equation is solved for some scalar-tensor theories of
gravitation in the case of homogeneous and isotropic cosmological models.We
present general solutions corresponding to cosmological term:
(i)\lambda(\phi)=0$ and $(ii) \lambda(\phi)=q\phi$.
| [
{
"created": "Thu, 5 Mar 1998 22:02:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pimentel",
"Luis O.",
"",
"Universidad Autónoma\n Metropolitana."
],
[
"Mora",
"César",
"",
"Universidad Autónoma\n Metropolitana."
]
] | The Wheeler-DeWitt equation is solved for some scalar-tensor theories of gravitation in the case of homogeneous and isotropic cosmological models.We present general solutions corresponding to cosmological term: (i)\lambda(\phi)=0$ and $(ii) \lambda(\phi)=q\phi$. |
2009.08221 | Bibhas Majhi Ranjan | Sumit Dey, Bibhas Ranjan Majhi | Covariant approach to the thermodynamic structure of a generic null
surface | Minor corrections, comments added, to appear in Phys. Rev. D | Phys. Rev. D 102, 124044 (2020) | 10.1103/PhysRevD.102.124044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We readdress the thermodynamic structure of geometrical relations on a
generic null surface. Among three potential candidates, originated from
different components of $R_{ab}$ along the null vectors for the surface (i.e.
$R_{ab}q^a_cl^b$, $R_{ab}l^al^b$ and $R_{ab}l^ak^b$ where $q_{ab}$ is the
projector on the null s... | [
{
"created": "Thu, 17 Sep 2020 11:50:34 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Dec 2020 03:01:10 GMT",
"version": "v2"
}
] | 2020-12-29 | [
[
"Dey",
"Sumit",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | We readdress the thermodynamic structure of geometrical relations on a generic null surface. Among three potential candidates, originated from different components of $R_{ab}$ along the null vectors for the surface (i.e. $R_{ab}q^a_cl^b$, $R_{ab}l^al^b$ and $R_{ab}l^ak^b$ where $q_{ab}$ is the projector on the null sur... |
2305.07331 | Claus Kiefer | Claus Kiefer | G\"odel's undecidability theorems and the search for a theory of
everything | 17 pages, prize winning essay awarded by the Kurt G\"odel Circle of
Friends Berlin | Int J Theor Phys 63, 52 (2024) | 10.1007/s10773-024-05574-2 | null | gr-qc hep-th physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I investigate the question whether G\"odel's undecidability theorems play a
crucial role in the search for a unified theory of physics. I conclude that
unless the structure of space-time is fundamentally discrete we can never
decide whether a given theory is the final one or not. This is relevant for
both canonical q... | [
{
"created": "Fri, 12 May 2023 09:20:25 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Feb 2024 14:32:21 GMT",
"version": "v2"
}
] | 2024-02-27 | [
[
"Kiefer",
"Claus",
""
]
] | I investigate the question whether G\"odel's undecidability theorems play a crucial role in the search for a unified theory of physics. I conclude that unless the structure of space-time is fundamentally discrete we can never decide whether a given theory is the final one or not. This is relevant for both canonical qua... |
0812.0830 | Genly Le\'on | Genly Leon, Rolando Cardenas, Jorge Luis Morales | Equilibrium sets in quintom cosmologies: the past asymptotic dynamics | 13 pages, revised version, one error amended. Analysis at infinity
added | null | null | null | gr-qc math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the previous paper \cite{Lazkoz:2006pa} was investigated the phase space
of quintom cosmologies for a class of exponential potentials. This study
suggests that the past asymptotic dynamics of such a model can be approximated
by the dynamics near a hyperbola of critical points. In this paper we obtain a
normal form... | [
{
"created": "Wed, 3 Dec 2008 23:05:57 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Dec 2009 20:14:00 GMT",
"version": "v2"
}
] | 2009-12-02 | [
[
"Leon",
"Genly",
""
],
[
"Cardenas",
"Rolando",
""
],
[
"Morales",
"Jorge Luis",
""
]
] | In the previous paper \cite{Lazkoz:2006pa} was investigated the phase space of quintom cosmologies for a class of exponential potentials. This study suggests that the past asymptotic dynamics of such a model can be approximated by the dynamics near a hyperbola of critical points. In this paper we obtain a normal form e... |
2005.02014 | Alejandro Jim\'enez-Cano | Alejandro Jim\'enez-Cano | New metric-affine generalizations of gravitational wave geometries | 25 pages, no figures, 1 table. We corrected some typos and
references. Version to be published in Eur. Phys. J. C | null | 10.1140/epjc/s10052-020-8239-5 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we explore generalizations of metric structures of the
gravitational wave type to geometries containing an independent connection. The
aim is simply to establish a new category of connections compatible, according
to some criteria, to the known metric structures for gravitational waves and,
additionally... | [
{
"created": "Tue, 5 May 2020 09:03:37 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jul 2020 16:47:29 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jul 2020 10:44:21 GMT",
"version": "v3"
}
] | 2020-08-26 | [
[
"Jiménez-Cano",
"Alejandro",
""
]
] | In this paper we explore generalizations of metric structures of the gravitational wave type to geometries containing an independent connection. The aim is simply to establish a new category of connections compatible, according to some criteria, to the known metric structures for gravitational waves and, additionally, ... |
2106.09235 | Olivier Sarbach | Rub\'en O. Acu\~na-C\'ardenas, Carlos Gabarrete, Olivier Sarbach | An introduction to the relativistic kinetic theory on curved spacetimes | 79 pages, 12 figures. Typos corrected, references added | null | 10.1007/s10714-022-02908-5 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article provides a self-contained pedagogical introduction to the
relativistic kinetic theory of a dilute gas propagating on a curved spacetime
manifold (M,g) of arbitrary dimension. Special emphasis is made on geometric
aspects of the theory in order to achieve a formulation which is manifestly
covariant on the... | [
{
"created": "Thu, 17 Jun 2021 04:03:45 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2022 02:59:05 GMT",
"version": "v2"
}
] | 2022-03-09 | [
[
"Acuña-Cárdenas",
"Rubén O.",
""
],
[
"Gabarrete",
"Carlos",
""
],
[
"Sarbach",
"Olivier",
""
]
] | This article provides a self-contained pedagogical introduction to the relativistic kinetic theory of a dilute gas propagating on a curved spacetime manifold (M,g) of arbitrary dimension. Special emphasis is made on geometric aspects of the theory in order to achieve a formulation which is manifestly covariant on the r... |
1403.1421 | Orlando Luongo | Salvatore Capozziello, Omer Farooq, Orlando Luongo, Bharat Ratra | Cosmographic bounds on the cosmological deceleration-acceleration
transition redshift in $f(\mathcal{R})$ gravity | 11 pages, 7 figures | null | 10.1103/PhysRevD.90.044016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the observational viability of a class of $f(\mathcal{R})$ gravity
cosmological models. Particular attention is devoted to constraints from the
recent observational determination of the redshift of the cosmological
deceleration-acceleration transition. Making use of the fact that the Ricci
scalar is a func... | [
{
"created": "Thu, 6 Mar 2014 11:49:20 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Farooq",
"Omer",
""
],
[
"Luongo",
"Orlando",
""
],
[
"Ratra",
"Bharat",
""
]
] | We examine the observational viability of a class of $f(\mathcal{R})$ gravity cosmological models. Particular attention is devoted to constraints from the recent observational determination of the redshift of the cosmological deceleration-acceleration transition. Making use of the fact that the Ricci scalar is a functi... |
1005.3273 | Sergio E. Jor\'as | G.C. Corr\^ea, T.J. Stuchi and S.E. Jor\'as | Homoclinic Chaos in Axisymmetric Bianchi-IX cosmological models with an
"ad hoc" quantum potential | 8 pages, 14 figures | Phys.Rev.D81:083531,2010 | 10.1103/PhysRevD.81.083531 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the dynamics of the axisymmetric Bianchi IX
cosmological model with a term of quantum potential added. As it is well known
this class of Bianchi IX models are homogeneous and anisotropic with two scale
factors, $A(t)$ and $B(t)$, derived from the solution of Einstein's equation
for General Relat... | [
{
"created": "Tue, 18 May 2010 18:11:31 GMT",
"version": "v1"
}
] | 2010-05-25 | [
[
"Corrêa",
"G. C.",
""
],
[
"Stuchi",
"T. J.",
""
],
[
"Jorás",
"S. E.",
""
]
] | In this work we study the dynamics of the axisymmetric Bianchi IX cosmological model with a term of quantum potential added. As it is well known this class of Bianchi IX models are homogeneous and anisotropic with two scale factors, $A(t)$ and $B(t)$, derived from the solution of Einstein's equation for General Relativ... |
2112.05448 | Alessandro Nagar | Andrea Placidi, Simone Albanesi, Alessandro Nagar, Marta Orselli,
Sebastiano Bernuzzi, and Gianluca Grignani | Exploiting Newton-factorized, 2PN-accurate, waveform multipoles in
effective-one-body models for spin-aligned noncircularized binaries | 34 pages, 19 figures, improved version. To appear in Phys. Rev. D | null | 10.1103/PhysRevD.105.104030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new approach to factorize and resum the post-Newtonian (PN)
waveform for generic equatorial motion to be used within effective-one-body
(EOB) based waveform models. The new multipolar waveform factorization improves
previous prescriptions in that: (i) the generic Newtonian contribution is
factored out fr... | [
{
"created": "Fri, 10 Dec 2021 11:02:36 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Mar 2022 16:37:25 GMT",
"version": "v2"
}
] | 2022-06-01 | [
[
"Placidi",
"Andrea",
""
],
[
"Albanesi",
"Simone",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"Orselli",
"Marta",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Grignani",
"Gianluca",
""
]
] | We present a new approach to factorize and resum the post-Newtonian (PN) waveform for generic equatorial motion to be used within effective-one-body (EOB) based waveform models. The new multipolar waveform factorization improves previous prescriptions in that: (i) the generic Newtonian contribution is factored out from... |
2205.05395 | Carlos A. R. Herdeiro | Carlos A. R. Herdeiro and Eugen Radu | On the classicality of bosonic stars | 11 pages; Essay written for the Gravity Research Foundation 2022
Awards for Essays on Gravitation and selected for Honorable Mention | null | 10.1142/S0218271822420226 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Because the Klein-Gordon and Proca equations involve $\hbar$, they describe
quantum fields. Their solutions, however, may be treated as classical if their
typical action obeys $S^{\rm typical}\gg \hbar$. This is possible due to their
bosonic nature, allowing states with many particles. We show, by generic
arguments, ... | [
{
"created": "Wed, 11 May 2022 10:39:10 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Radu",
"Eugen",
""
]
] | Because the Klein-Gordon and Proca equations involve $\hbar$, they describe quantum fields. Their solutions, however, may be treated as classical if their typical action obeys $S^{\rm typical}\gg \hbar$. This is possible due to their bosonic nature, allowing states with many particles. We show, by generic arguments, th... |
gr-qc/9710008 | Carlo Rovelli | Carlo Rovelli | Loop Quantum Gravity | Review paper written for the electronic journal `Living Reviews'. 34
pages | LivingRev.Rel.1:1,1998 | 10.12942/lrr-1998-1 | null | gr-qc hep-th | null | The problem of finding the quantum theory of the gravitational field, and
thus understanding what is quantum spacetime, is still open. One of the most
active of the current approaches is loop quantum gravity. Loop quantum gravity
is a mathematically well-defined, non-perturbative and background independent
quantizati... | [
{
"created": "Wed, 1 Oct 1997 22:53:52 GMT",
"version": "v1"
}
] | 2016-10-19 | [
[
"Rovelli",
"Carlo",
""
]
] | The problem of finding the quantum theory of the gravitational field, and thus understanding what is quantum spacetime, is still open. One of the most active of the current approaches is loop quantum gravity. Loop quantum gravity is a mathematically well-defined, non-perturbative and background independent quantization... |
1406.3318 | Vassilis S. Geroyannis | Vassilis Geroyannis, Eleftheria Tzelati | Quasi-radial modes of pulsating neutron stars: numerical results for
general-relativistic rigidly rotating polytropic models | v1 has been submitted to the International Journal of Astronomy and
Astrophysics and accepted after revision; v2, i.e. the present version, is
the revised E-print; 16 pages | International Journal of Astronomy and Astrophysics, 2014, 4,
453-463 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we compute general-relativistic polytropic models simulating
rigidly rotating, pulsating neutron stars. These relativistic compact objects,
with a radius of $\sim 10 \, \mathrm{km}$ and mass between $\sim 1.4$ and $3.2$
solar masses, are closely related to pulsars. We emphasize on computing the
change i... | [
{
"created": "Thu, 12 Jun 2014 18:56:39 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Oct 2014 21:46:25 GMT",
"version": "v2"
}
] | 2014-10-14 | [
[
"Geroyannis",
"Vassilis",
""
],
[
"Tzelati",
"Eleftheria",
""
]
] | In this paper we compute general-relativistic polytropic models simulating rigidly rotating, pulsating neutron stars. These relativistic compact objects, with a radius of $\sim 10 \, \mathrm{km}$ and mass between $\sim 1.4$ and $3.2$ solar masses, are closely related to pulsars. We emphasize on computing the change in ... |
2304.11131 | Roberto Maluf | Alana C. L. Santos, C\'elio R. Muniz, Roberto V. Maluf | Yang-Mills Casimir wormholes in $D=2+1$ | 30 pages, 13 figures, Improved and accepted version for publication
in JCAP | JCAP 09 (2023) 022 | 10.1088/1475-7516/2023/09/022 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This work presents new three-dimensional traversable wormhole solutions
sourced by the Casimir density and pressures related to the quantum vacuum
fluctuations in Yang-Mills (Y-M) theory. We begin by analyzing the
noninteracting Y-M Casimir wormholes, initially considering an arbitrary state
parameter $\omega$ and de... | [
{
"created": "Fri, 21 Apr 2023 17:13:06 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 2023 12:24:20 GMT",
"version": "v2"
}
] | 2023-09-20 | [
[
"Santos",
"Alana C. L.",
""
],
[
"Muniz",
"Célio R.",
""
],
[
"Maluf",
"Roberto V.",
""
]
] | This work presents new three-dimensional traversable wormhole solutions sourced by the Casimir density and pressures related to the quantum vacuum fluctuations in Yang-Mills (Y-M) theory. We begin by analyzing the noninteracting Y-M Casimir wormholes, initially considering an arbitrary state parameter $\omega$ and dete... |
1711.02956 | Ion I. Cotaescu | Ion I. Cotaescu | de Sitter geodesics | 18 pages, 6 figures | null | 10.1142/S0217732317502236 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geodesics on the $(1+3)$-dimensional de Sitter spacetime are considered
studying how their parameters are determined by the conserved quantities in the
conformal Euclidean, Friedmann-Lema\^itre-Robertson-Walker, de
Sitter-Painlev\'e and static local charts with Cartesian space coordinates.
Moreover, it is shown t... | [
{
"created": "Wed, 8 Nov 2017 14:23:48 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Dec 2017 15:46:06 GMT",
"version": "v2"
}
] | 2017-12-20 | [
[
"Cotaescu",
"Ion I.",
""
]
] | The geodesics on the $(1+3)$-dimensional de Sitter spacetime are considered studying how their parameters are determined by the conserved quantities in the conformal Euclidean, Friedmann-Lema\^itre-Robertson-Walker, de Sitter-Painlev\'e and static local charts with Cartesian space coordinates. Moreover, it is shown tha... |
gr-qc/0512132 | S. Mignemi | M. Melis and S. Mignemi | Global properties of charged dilatonic Gauss-Bonnet black holes | 10 pages, plain TeX | Phys.Rev. D73 (2006) 083010 | 10.1103/PhysRevD.73.083010 | null | gr-qc | null | We study the phase space of the spherically symmetric solutions of
Einstein-Maxwell-Gauss-Bonnet system nonminimally coupled to a scalar field and
prove the existence of solutions with unusual asymptotics in addition to
asymptotically flat ones. We also find new dyonic solutions of dilatonic
Einstein-Maxwell theory.
| [
{
"created": "Thu, 22 Dec 2005 12:15:06 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Melis",
"M.",
""
],
[
"Mignemi",
"S.",
""
]
] | We study the phase space of the spherically symmetric solutions of Einstein-Maxwell-Gauss-Bonnet system nonminimally coupled to a scalar field and prove the existence of solutions with unusual asymptotics in addition to asymptotically flat ones. We also find new dyonic solutions of dilatonic Einstein-Maxwell theory. |
1411.2849 | Sergiu I. Vacaru | Sergiu I. Vacaru, Elsen Veli Veliev and Enis Yazici | A geometric method of constructing exact solutions in modified
f(R,T)-gravity with Yang-Mills and Higgs interactions | 37 pages, IJGMMP style, a review of authors' contributions at
conferences and seminars | Int. J. Geom. Meth. Mod. Phys. 11 (2014) 1450088 | 10.1142/S0219887814500881 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a geometric techniques can be elaborated and applied for
constructing generic off-diagonal exact solutions in $f(R,T)$--modified gravity
for systems of gravitational-Yang-Mills-Higgs equations. The corresponding
classes of metrics and generalized connections are determined by generating and
integration f... | [
{
"created": "Mon, 10 Nov 2014 12:58:28 GMT",
"version": "v1"
}
] | 2014-11-12 | [
[
"Vacaru",
"Sergiu I.",
""
],
[
"Veliev",
"Elsen Veli",
""
],
[
"Yazici",
"Enis",
""
]
] | We show that a geometric techniques can be elaborated and applied for constructing generic off-diagonal exact solutions in $f(R,T)$--modified gravity for systems of gravitational-Yang-Mills-Higgs equations. The corresponding classes of metrics and generalized connections are determined by generating and integration fun... |
1110.1772 | Christian Corda cordac | Christian Corda | Primordial gravity's breath | 11 pages, accepted for publication in Electronic Journal of
Theoretical Physics | EJTP 9, 26, 1-10 (2012) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By releasing a formula that directly connects the average amplitude of the
relic stochastic gravitational-wave background (SGWB) with the Inflaton field
and the equation for the characteristic amplitude h_c for the relic SGWB, in
this paper the upper bounds on the relic SGWB from the Wilkinson Microwave
Anisotropy Pr... | [
{
"created": "Sat, 8 Oct 2011 21:51:46 GMT",
"version": "v1"
}
] | 2012-01-31 | [
[
"Corda",
"Christian",
""
]
] | By releasing a formula that directly connects the average amplitude of the relic stochastic gravitational-wave background (SGWB) with the Inflaton field and the equation for the characteristic amplitude h_c for the relic SGWB, in this paper the upper bounds on the relic SGWB from the Wilkinson Microwave Anisotropy Prob... |
1901.03967 | Husin Alatas | Husin Alatas, Ahmad K. Falah, Trio Wibowo, Muhammad A. Qohhar, Bobby
E. Gunara | On the Lapse Function of FLRW Accelerated Expanding Universe in dRGT
Massive Gravity Theory | 14 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this report, we discuss the behavior of coordinate-time dependent lapse
function of FLRW metric of an accelerated expanding universe in the de
Rham-Gabadadze-Tolley massive gravity theory. We find for the conventional dRGT
formalism the corresponding lapse function can exhibit unphysical behaviors in
the associate... | [
{
"created": "Sun, 13 Jan 2019 12:09:42 GMT",
"version": "v1"
}
] | 2019-01-15 | [
[
"Alatas",
"Husin",
""
],
[
"Falah",
"Ahmad K.",
""
],
[
"Wibowo",
"Trio",
""
],
[
"Qohhar",
"Muhammad A.",
""
],
[
"Gunara",
"Bobby E.",
""
]
] | In this report, we discuss the behavior of coordinate-time dependent lapse function of FLRW metric of an accelerated expanding universe in the de Rham-Gabadadze-Tolley massive gravity theory. We find for the conventional dRGT formalism the corresponding lapse function can exhibit unphysical behaviors in the associated ... |
2206.07900 | Henrique de Oliveira | T. S. Mendon\c{c}a and H. P. de Oliveira | Quest for eternal oscillons | 8 pages, 10 figures, accepted to be published in Physical Review D | null | 10.1103/PhysRevD.105.116028 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Nonlinear field theories produce unstable but long-lived configurations known
as oscillons. These structures have been studied with asymmetric and symmetric
double-well potentials and extended to other forms of potentials. In the
present work, we examine the consequences of considering higher-order field
theories, wh... | [
{
"created": "Thu, 16 Jun 2022 03:20:28 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Mendonça",
"T. S.",
""
],
[
"de Oliveira",
"H. P.",
""
]
] | Nonlinear field theories produce unstable but long-lived configurations known as oscillons. These structures have been studied with asymmetric and symmetric double-well potentials and extended to other forms of potentials. In the present work, we examine the consequences of considering higher-order field theories, wher... |
0704.3623 | Masato Minamitsuji | Masato Minamitsuji | Casimir effect in a 6D warped flux compactification model | 18 pages, 6 figures, references and comments added, typos corrected | null | null | LMU-ASC 28/07 | gr-qc astro-ph hep-ph hep-th | null | We discuss Casimir effect of a massless, minimally coupled scalar field in a
6D warped flux compactification model and its implications for the hierarchy
and cosmological constant problems, which are longstanding puzzles in
phenomenology and cosmology. Due to the scale invariance of the background
theory, the 4D effe... | [
{
"created": "Thu, 26 Apr 2007 20:38:33 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2007 08:33:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Minamitsuji",
"Masato",
""
]
] | We discuss Casimir effect of a massless, minimally coupled scalar field in a 6D warped flux compactification model and its implications for the hierarchy and cosmological constant problems, which are longstanding puzzles in phenomenology and cosmology. Due to the scale invariance of the background theory, the 4D effect... |
0901.4365 | Matt Visser | Matt Visser (Victoria University of Wellington) | Black holes in general relativity | V1: 16 pages; 7 figures; Introductory survey talk at the workshop:
"Black Holes in General Relativity and String Theory", 24-30 August, 2008,
Veli Losinj, Croatia; V2: Some clarifying comments added regarding horizon
detection (section 5), two references added, two figures condensed to halve
the size of the fin... | PoS BHs,GRandStrings 2008:001,2008 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | What is going on (as of August 2008) at the interface between theoretical
general relativity, string-inspired models, and observational astrophysics?
Quite a lot. In this mini-survey I will make a personal choice and focus on
four specific questions: Do black holes "exist"? (For selected values of the
word "exist".) ... | [
{
"created": "Wed, 28 Jan 2009 09:09:22 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Jan 2009 21:24:47 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Feb 2009 09:45:51 GMT",
"version": "v3"
}
] | 2010-02-16 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | What is going on (as of August 2008) at the interface between theoretical general relativity, string-inspired models, and observational astrophysics? Quite a lot. In this mini-survey I will make a personal choice and focus on four specific questions: Do black holes "exist"? (For selected values of the word "exist".) Is... |
gr-qc/0505096 | Diego Pavon | Luis P. Chimento and Diego Pavon | Dual interacting cosmologies and late accelerated expansion | 13 pages, 1 figura, version to match published article | Phys.Rev. D73 (2006) 063511 | 10.1103/PhysRevD.73.063511 | null | gr-qc astro-ph hep-ph hep-th | null | In this paper we show that by considering a universe dominated by two
interacting components a superaccelerated expansion can be obtained from a
decelerated one by applying a dual transformation that leaves the Einstein's
field equations invariant.
| [
{
"created": "Thu, 19 May 2005 14:26:54 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2006 15:19:36 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Apr 2006 14:43:28 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Chimento",
"Luis P.",
""
],
[
"Pavon",
"Diego",
""
]
] | In this paper we show that by considering a universe dominated by two interacting components a superaccelerated expansion can be obtained from a decelerated one by applying a dual transformation that leaves the Einstein's field equations invariant. |
1304.5095 | Md. Wali Hossain | Radouane Gannouji, Md. Wali Hossain, M. Sami, Emmanuel N. Saridakis | Quasi-dilaton non-linear massive gravity: Investigations of background
cosmological dynamics | 13 pages, 8 figures, a minor comment on superluminality added,
references added, to appear in PRD | Phys. Rev. D 87, 123536 (2013) | 10.1103/PhysRevD.87.123536 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cosmological behavior in the quasi-Dilaton non-linear massive
gravity. We perform a detailed dynamical analysis and examine the stable
late-time solutions relevant to late time cosmic acceleration. We demonstrate
that a dark-energy dominated, cosmological-constant-like solution is a late
attractor of t... | [
{
"created": "Thu, 18 Apr 2013 12:10:52 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jun 2013 09:11:36 GMT",
"version": "v2"
}
] | 2013-07-02 | [
[
"Gannouji",
"Radouane",
""
],
[
"Hossain",
"Md. Wali",
""
],
[
"Sami",
"M.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate cosmological behavior in the quasi-Dilaton non-linear massive gravity. We perform a detailed dynamical analysis and examine the stable late-time solutions relevant to late time cosmic acceleration. We demonstrate that a dark-energy dominated, cosmological-constant-like solution is a late attractor of the... |
1212.5520 | Sylvain Marsat | Alejandro Boh\'e, Sylvain Marsat, Guillaume Faye, Luc Blanchet | Next-to-next-to-leading order spin-orbit effects in the near-zone metric
and precession equations of compact binaries | 40 pages; replaced to match the published version; two references
added | Class. Quantum Grav. 30 (2013) 075017 | 10.1088/0264-9381/30/7/075017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend our previous work devoted to the computation of the
next-to-next-to-leading order spin-orbit correction (corresponding to 3.5PN
order) in the equations of motion of spinning compact binaries, by: (i)
Deriving the corresponding spin-orbit terms in the evolution equations for the
spins, the conserved integral... | [
{
"created": "Fri, 21 Dec 2012 16:50:18 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2013 11:59:41 GMT",
"version": "v2"
}
] | 2013-04-03 | [
[
"Bohé",
"Alejandro",
""
],
[
"Marsat",
"Sylvain",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Blanchet",
"Luc",
""
]
] | We extend our previous work devoted to the computation of the next-to-next-to-leading order spin-orbit correction (corresponding to 3.5PN order) in the equations of motion of spinning compact binaries, by: (i) Deriving the corresponding spin-orbit terms in the evolution equations for the spins, the conserved integrals ... |
1912.06584 | Marius Oltean | Marius Oltean | Study of the Relativistic Dynamics of Extreme-Mass-Ratio Inspirals | PhD thesis, Autonomous University of Barcelona and University of
Orl\'eans, 2019 (302 pages, 39 figures) | null | null | null | gr-qc astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The principal subject of this thesis is the gravitational two-body problem in
the extreme-mass-ratio regime---that is, where one mass is significantly
smaller than the other---in the full context of our contemporary theory of
gravity, general relativity. We divide this work into two broad parts: the
first provides an... | [
{
"created": "Fri, 13 Dec 2019 16:10:58 GMT",
"version": "v1"
}
] | 2019-12-16 | [
[
"Oltean",
"Marius",
""
]
] | The principal subject of this thesis is the gravitational two-body problem in the extreme-mass-ratio regime---that is, where one mass is significantly smaller than the other---in the full context of our contemporary theory of gravity, general relativity. We divide this work into two broad parts: the first provides an o... |
1205.5419 | Guoying Chee | Guoying Chee, Yongxin Guo | Torsion and accelerating expansion of the universe in quadratic
gravitation | 20 pages. arXiv admin note: text overlap with gr-qc/0604006,
arXiv:1110.3449 | Class. Quantum Grav. 29 (2012) 235022 (22pp) | 10.1088/0264-9381/29/23/235022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several exact cosmological solutions of a metric-affine theory of gravity
with two torsion functions are presented. These solutions give a essentially
different explanation from the one in most of previous works to the cause of
the accelerating cosmological expansion and the origin of the torsion of the
spacetime. Th... | [
{
"created": "Thu, 24 May 2012 12:18:43 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2013 12:17:04 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Chee",
"Guoying",
""
],
[
"Guo",
"Yongxin",
""
]
] | Several exact cosmological solutions of a metric-affine theory of gravity with two torsion functions are presented. These solutions give a essentially different explanation from the one in most of previous works to the cause of the accelerating cosmological expansion and the origin of the torsion of the spacetime. Thes... |
2004.05128 | Peter Tsun Ho Pang | Yasmeen Asali, Peter T. H. Pang, Anuradha Samajdar, Chris Van Den
Broeck | Probing resonant excitations in exotic compact objects via gravitational
waves | 9 pages, 8 figures | Phys. Rev. D 102, 024016 (2020) | 10.1103/PhysRevD.102.024016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves (GWs) from presumed binary black hole mergers are now
being detected on a regular basis with the Advanced LIGO and Advanced Virgo
interferometers. Exotic compact objects (ECOs) have been proposed that differ
from Kerr black holes, and which could leave an imprint upon the GW signal in a
variety of... | [
{
"created": "Fri, 10 Apr 2020 17:17:36 GMT",
"version": "v1"
}
] | 2020-07-07 | [
[
"Asali",
"Yasmeen",
""
],
[
"Pang",
"Peter T. H.",
""
],
[
"Samajdar",
"Anuradha",
""
],
[
"Broeck",
"Chris Van Den",
""
]
] | Gravitational waves (GWs) from presumed binary black hole mergers are now being detected on a regular basis with the Advanced LIGO and Advanced Virgo interferometers. Exotic compact objects (ECOs) have been proposed that differ from Kerr black holes, and which could leave an imprint upon the GW signal in a variety of w... |
gr-qc/0107029 | Richard Price | Richard H. Price and John T. Whelan | Tidal interaction in binary black hole inspiral | 5 pages, 2 figures | Phys.Rev.Lett. 87 (2001) 231101 | 10.1103/PhysRevLett.87.231101 | null | gr-qc | null | In rotating viscous fluid stars, tidal torque leads to an exchange of spin
and orbital angular momentum. The horizon of a black hole has an effective
viscosity that is large compared to that of stellar fluids, and an effective
tidal torque may lead to important effects in the strong field interaction at
the endpoint ... | [
{
"created": "Mon, 9 Jul 2001 23:26:56 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Price",
"Richard H.",
""
],
[
"Whelan",
"John T.",
""
]
] | In rotating viscous fluid stars, tidal torque leads to an exchange of spin and orbital angular momentum. The horizon of a black hole has an effective viscosity that is large compared to that of stellar fluids, and an effective tidal torque may lead to important effects in the strong field interaction at the endpoint of... |
1704.03537 | Yusuf Sucu | Ganim Gecim and Yusuf Sucu | The GUP effect on tunnelling of massive vector bosons from the 2+1
dimensional black hole | 11 pages, accepted for publication for Advances in High Energy
Physics | null | 10.1155/2018/7031767 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, the Generalized Uncertainty Principle (GUP) effect on the
Hawking radiation formed by tunneling of a massive vector boson particle from
the $2+1$ dimensional New-type Black Hole was investigated. We used modified
massive vector boson equation based on the GUP. Then, the Hamilton-Jacobi
quantum tunnelin... | [
{
"created": "Mon, 10 Apr 2017 15:23:29 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Aug 2017 12:41:54 GMT",
"version": "v2"
},
{
"created": "Wed, 16 May 2018 11:27:53 GMT",
"version": "v3"
}
] | 2018-06-26 | [
[
"Gecim",
"Ganim",
""
],
[
"Sucu",
"Yusuf",
""
]
] | In this study, the Generalized Uncertainty Principle (GUP) effect on the Hawking radiation formed by tunneling of a massive vector boson particle from the $2+1$ dimensional New-type Black Hole was investigated. We used modified massive vector boson equation based on the GUP. Then, the Hamilton-Jacobi quantum tunneling ... |
2402.16275 | Bivudutta Mishra Dr. | S.A. Narawade, S.K. Tripathy, Raghunath Patra, B.Mishra | Baryon asymmetry constraints on Extended Symmetric Teleparallel Gravity | 7 pages, 4 figures, Accepted for publication in Gravitation and
Cosmology. Yet to receive the DoI | Gravitation and Cosmology, 30(2), 135-140, 2024 | 10.1134/S0202289324700026 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have explored the observed matter-antimatter asymmetry in
the Universe to constrain the model parameters in extended symmetric
teleparallel gravity (STG) or $f(Q,T)$ gravity, where $Q$ be the nonmetricity
and $T$ be the trace of energy momentum tensor. We have considered two
functional forms of $f(Q... | [
{
"created": "Mon, 26 Feb 2024 03:33:44 GMT",
"version": "v1"
}
] | 2024-05-30 | [
[
"Narawade",
"S. A.",
""
],
[
"Tripathy",
"S. K.",
""
],
[
"Patra",
"Raghunath",
""
],
[
"Mishra",
"B.",
""
]
] | In this paper, we have explored the observed matter-antimatter asymmetry in the Universe to constrain the model parameters in extended symmetric teleparallel gravity (STG) or $f(Q,T)$ gravity, where $Q$ be the nonmetricity and $T$ be the trace of energy momentum tensor. We have considered two functional forms of $f(Q,T... |
1611.02240 | Sergey Yu. Vernov | Ekaterina Pozdeeva and Sergey Vernov | Integrable cosmological models with non-minimal coupling and bounce
solutions | 9 pages, 1 figure, in the proceedings of the 19th International
Seminar on High Energy Physics "Quarks-2016" | EPJ Web of Conferences 125 (2016) 03008 | 10.1051/epjconf/201612503008 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We remind the way to obtain integrable models with non-minimally coupled
scalar fields. We are interesting to models with bounce solutions and compare
bounce solutions in two known integrable models. We show that only one model
has a bounce solution that tends to a stable de Sitter solution.
| [
{
"created": "Mon, 7 Nov 2016 19:59:26 GMT",
"version": "v1"
}
] | 2016-11-08 | [
[
"Pozdeeva",
"Ekaterina",
""
],
[
"Vernov",
"Sergey",
""
]
] | We remind the way to obtain integrable models with non-minimally coupled scalar fields. We are interesting to models with bounce solutions and compare bounce solutions in two known integrable models. We show that only one model has a bounce solution that tends to a stable de Sitter solution. |
1302.2383 | Bethan Cropp | Bethan Cropp (SISSA/INFN), Stefano Liberati (SISSA/INFN), and Matt
Visser (Victoria University of Wellington) | Surface gravities for non-Killing horizons | 29 pages, 1 table | Classical and Quantum Gravity 30 (2013) 125001 | 10.1088/0264-9381/30/12/125001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are many logically and computationally distinct characterizations of
the surface gravity of a horizon, just as there are many logically rather
distinct notions of horizon. Fortunately, in standard general relativity, for
stationary horizons, most of these characterizations are degenerate. However,
in modified g... | [
{
"created": "Mon, 11 Feb 2013 01:07:59 GMT",
"version": "v1"
}
] | 2013-06-18 | [
[
"Cropp",
"Bethan",
"",
"SISSA/INFN"
],
[
"Liberati",
"Stefano",
"",
"SISSA/INFN"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | There are many logically and computationally distinct characterizations of the surface gravity of a horizon, just as there are many logically rather distinct notions of horizon. Fortunately, in standard general relativity, for stationary horizons, most of these characterizations are degenerate. However, in modified gra... |
1706.06212 | Maria J. Rodriguez | Maria J. Rodriguez | Binary Black Hole in a Double Magnetic Monopole Field | 5 pages, 6 figures | null | 10.1140/epjc/s10052-018-5550-5 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ambient magnetic fields are thought to play a critical role in black hole jet
formation. Furthermore, dual electromagnetic signals could be produced during
the inspiral and merger of binary black hole systems. However, due to the
absence of theoretical models, the physical status of binary black hole arrays
with dual... | [
{
"created": "Mon, 19 Jun 2017 23:20:11 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Rodriguez",
"Maria J.",
""
]
] | Ambient magnetic fields are thought to play a critical role in black hole jet formation. Furthermore, dual electromagnetic signals could be produced during the inspiral and merger of binary black hole systems. However, due to the absence of theoretical models, the physical status of binary black hole arrays with dual j... |
1405.7056 | Daniele Pranzetti | Amit Ghosh and Daniele Pranzetti | CFT/Gravity Correspondence on the Isolated Horizon | 22 pages, 2 figure; some important passages have been explained more
in detail | Nuclear Physics B 889 (2014) 1 | 10.1016/j.nuclphysb.2014.10.002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quantum isolated horizon can be modeled by an SU(2) Chern-Simons theory on
a punctured 2-sphere. We show how a local 2-dimensional conformal symmetry
arises at each puncture inducing an infinite set of new observables localized
at the horizon which satisfy a Kac-Moody algebra. By means of the isolated
horizon bound... | [
{
"created": "Tue, 27 May 2014 20:30:22 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 2014 15:52:50 GMT",
"version": "v2"
}
] | 2014-10-20 | [
[
"Ghosh",
"Amit",
""
],
[
"Pranzetti",
"Daniele",
""
]
] | A quantum isolated horizon can be modeled by an SU(2) Chern-Simons theory on a punctured 2-sphere. We show how a local 2-dimensional conformal symmetry arises at each puncture inducing an infinite set of new observables localized at the horizon which satisfy a Kac-Moody algebra. By means of the isolated horizon boundar... |
0807.0181 | Joan Josep Ferrando | Joan J. Ferrando and Juan A. S\'aez | On the algebraic types of the Bel-Robinson tensor | 21 pages | Gen.Rel.Grav.41:1695-1715,2009 | 10.1007/s10714-008-0738-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bel-Robinson tensor is analyzed as a linear map on the space of the
traceless symmetric tensors. This study leads to an algebraic classification
that refines the usual Petrov-Bel classification of the Weyl tensor. The new
classes correspond to degenerate type I space-times which have already been
introduced in li... | [
{
"created": "Tue, 1 Jul 2008 16:00:27 GMT",
"version": "v1"
}
] | 2009-08-05 | [
[
"Ferrando",
"Joan J.",
""
],
[
"Sáez",
"Juan A.",
""
]
] | The Bel-Robinson tensor is analyzed as a linear map on the space of the traceless symmetric tensors. This study leads to an algebraic classification that refines the usual Petrov-Bel classification of the Weyl tensor. The new classes correspond to degenerate type I space-times which have already been introduced in lite... |
0905.4534 | Mariusz Dabrowski P. | Mariusz P. Dabrowski and Janusz Garecki | Statefinders and observational measurement of superenergy | REVTEX 4.0, 7 pages, no figures | Phys.Lett.B686:6-10,2010 | 10.1016/j.physletb.2010.02.019 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The superenergy of the universe is a tensorial quantity and it is a general
relativistic analogue of the Appell's energy of acceleration in classical
mechanics. We propose the measurement of this quantity by the observational
parameters such as the Hubble parameter, the deceleration parameter, the jerk
and the snap (... | [
{
"created": "Wed, 27 May 2009 23:05:03 GMT",
"version": "v1"
}
] | 2010-03-02 | [
[
"Dabrowski",
"Mariusz P.",
""
],
[
"Garecki",
"Janusz",
""
]
] | The superenergy of the universe is a tensorial quantity and it is a general relativistic analogue of the Appell's energy of acceleration in classical mechanics. We propose the measurement of this quantity by the observational parameters such as the Hubble parameter, the deceleration parameter, the jerk and the snap (ke... |
1911.01920 | Patryk Mach | Wojciech Dyba, Wojciech Kulczycki, Patryk Mach | Self-gravitating perfect-fluid tori around black holes: Bifurcations,
ergoregions, and geometrical properties | 16 pages, 25 figures, 3 tables | Phys. Rev. D 101, 044036 (2020) | 10.1103/PhysRevD.101.044036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate models of stationary, selfgravitating, perfect-fluid tori
(disks) rotating around black holes, focusing on geometric properties of
spacetime. The models are constructed within the general-relativistic
hydrodynamics, assuming differential (Keplerian) rotation of the fluid. We
discuss a parametric bifurc... | [
{
"created": "Tue, 5 Nov 2019 16:31:12 GMT",
"version": "v1"
}
] | 2020-02-26 | [
[
"Dyba",
"Wojciech",
""
],
[
"Kulczycki",
"Wojciech",
""
],
[
"Mach",
"Patryk",
""
]
] | We investigate models of stationary, selfgravitating, perfect-fluid tori (disks) rotating around black holes, focusing on geometric properties of spacetime. The models are constructed within the general-relativistic hydrodynamics, assuming differential (Keplerian) rotation of the fluid. We discuss a parametric bifurcat... |
2209.08837 | Shao-Wen Wei | Chao-Hui Wang, Cheng-Qun Pang, Shao-Wen Wei | Extracting energy via magnetic reconnection from Kerr-de Sitter black
holes | 17 pages, 12 figures. Revised version | Phys. Rev. D 106, 124050 (2022) | 10.1103/PhysRevD.106.124050 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | It has been recently shown that magnetic reconnection can provide us a novel
mechanism to extract black hole rotational energy from a Kerr black holes. In
this paper, we study the energy extraction from the Kerr-de Sitter black hole
via this magnetic reconnection process. The result shows that, with the
increase of t... | [
{
"created": "Mon, 19 Sep 2022 08:33:14 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Mar 2023 03:11:04 GMT",
"version": "v2"
}
] | 2023-03-14 | [
[
"Wang",
"Chao-Hui",
""
],
[
"Pang",
"Cheng-Qun",
""
],
[
"Wei",
"Shao-Wen",
""
]
] | It has been recently shown that magnetic reconnection can provide us a novel mechanism to extract black hole rotational energy from a Kerr black holes. In this paper, we study the energy extraction from the Kerr-de Sitter black hole via this magnetic reconnection process. The result shows that, with the increase of the... |
2403.18936 | Yiqi Xie | Yiqi Xie, Deep Chatterjee, Gautham Narayan, Nicol\'as Yunes | Neural Post-Einsteinian Framework for Efficient Theory-Agnostic Tests of
General Relativity with Gravitational Waves | 30 pages, 15 figures, submitted to PRD | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parametrized post-Einsteinian (ppE) framework and its variants are widely
used to probe gravity through gravitational-wave tests that apply to a large
class of theories beyond general relativity. However, the ppE framework is not
truly theory-agnostic as it only captures certain types of deviations from
general r... | [
{
"created": "Wed, 27 Mar 2024 18:35:26 GMT",
"version": "v1"
}
] | 2024-03-29 | [
[
"Xie",
"Yiqi",
""
],
[
"Chatterjee",
"Deep",
""
],
[
"Narayan",
"Gautham",
""
],
[
"Yunes",
"Nicolás",
""
]
] | The parametrized post-Einsteinian (ppE) framework and its variants are widely used to probe gravity through gravitational-wave tests that apply to a large class of theories beyond general relativity. However, the ppE framework is not truly theory-agnostic as it only captures certain types of deviations from general rel... |
1707.09331 | Emmanuil Saridakis | Emmanuel N. Saridakis (CUPT, Chongqing & Natl. Tech. U., Athens &
Baylor U.) | Ricci-Gauss-Bonnet holographic dark energy | 11 pages, 4 figures, version published in Phys. Rev. D | Phys. Rev. D 97, 064035 (2018) | 10.1103/PhysRevD.97.064035 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model of holographic dark energy in which the Infrared cutoff is
determined by both the Ricci and the Gauss-Bonnet invariants. Such a
construction has the significant advantage that the Infrared cutoff, and
consequently the holographic dark energy density, does not depend on the future
or the past evolut... | [
{
"created": "Fri, 28 Jul 2017 17:10:54 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Apr 2018 19:59:56 GMT",
"version": "v2"
}
] | 2018-04-06 | [
[
"Saridakis",
"Emmanuel N.",
"",
"CUPT, Chongqing & Natl. Tech. U., Athens &\n Baylor U."
]
] | We present a model of holographic dark energy in which the Infrared cutoff is determined by both the Ricci and the Gauss-Bonnet invariants. Such a construction has the significant advantage that the Infrared cutoff, and consequently the holographic dark energy density, does not depend on the future or the past evolutio... |
1905.10382 | Andrew R. Liddle | Stephon Alexander, Marina Cort\^es, Andrew R. Liddle, Jo\~ao Magueijo,
Robert Sims, and Lee Smolin | The cosmology of minimal varying Lambda theories | Companion paper to arXiv:1905.10380. Minor updates to match published
version | Phys. Rev. D 100, 083507 (2019) | 10.1103/PhysRevD.100.083507 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inserting a varying Lambda in Einstein's field equations can be made
consistent with the Bianchi identities by allowing for torsion, without the
need to add scalar field degrees of freedom. In the minimal such theory, Lambda
is totally free and undetermined by the field equations in the absence of
matter. Inclusion o... | [
{
"created": "Fri, 24 May 2019 18:00:08 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2019 14:32:30 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Oct 2019 16:20:22 GMT",
"version": "v3"
}
] | 2019-10-07 | [
[
"Alexander",
"Stephon",
""
],
[
"Cortês",
"Marina",
""
],
[
"Liddle",
"Andrew R.",
""
],
[
"Magueijo",
"João",
""
],
[
"Sims",
"Robert",
""
],
[
"Smolin",
"Lee",
""
]
] | Inserting a varying Lambda in Einstein's field equations can be made consistent with the Bianchi identities by allowing for torsion, without the need to add scalar field degrees of freedom. In the minimal such theory, Lambda is totally free and undetermined by the field equations in the absence of matter. Inclusion of ... |
1112.6054 | Diego S\'aez | Neus Puchades and Diego S\'aez | Relativistic positioning: four-dimensional numerical approach in
Minkowski space-time | 16 pages, 9 figures, published (online) in Astrophys. Space Sci | null | 10.1007/s10509-012-1135-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We simulate the satellite constellations of two Global Navigation Satellite
Systems: Galileo (EU) and GPS (USA). Satellite motions are described in the
Schwarzschild space-time produced by an idealized spherically symmetric non
rotating Earth. The trajectories are then circumferences centered at the same
point as Ear... | [
{
"created": "Wed, 28 Dec 2011 03:34:27 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jul 2012 15:17:31 GMT",
"version": "v2"
}
] | 2012-07-11 | [
[
"Puchades",
"Neus",
""
],
[
"Sáez",
"Diego",
""
]
] | We simulate the satellite constellations of two Global Navigation Satellite Systems: Galileo (EU) and GPS (USA). Satellite motions are described in the Schwarzschild space-time produced by an idealized spherically symmetric non rotating Earth. The trajectories are then circumferences centered at the same point as Earth... |
2201.11031 | Genly Le\'on | Andronikos Paliathanasis (DUT, Durban and Chile Austral U., Valdivia),
Genly Leon (Catolica del Norte U.) | Modified Brans-Dicke cosmology with Minimum Length Uncertainty | 27 pages, 2 figures | null | 10.1007/s10714-022-03059-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a modification of the Brans-Dicke gravitational Action Integral
inspired by the existence of a minimum length uncertainty for the scalar field.
In particular, the kinetic part of the Brans-Dicke scalar field is modified
such that the equation of motion for the scalar field be modified according to
the qua... | [
{
"created": "Wed, 26 Jan 2022 16:13:04 GMT",
"version": "v1"
}
] | 2023-01-11 | [
[
"Paliathanasis",
"Andronikos",
"",
"DUT, Durban and Chile Austral U., Valdivia"
],
[
"Leon",
"Genly",
"",
"Catolica del Norte U."
]
] | We consider a modification of the Brans-Dicke gravitational Action Integral inspired by the existence of a minimum length uncertainty for the scalar field. In particular, the kinetic part of the Brans-Dicke scalar field is modified such that the equation of motion for the scalar field be modified according to the quadr... |
1808.01007 | Pierre-Henri Chavanis | Giuseppe Alberti and Pierre-Henri Chavanis | Caloric curves of self-gravitating fermions in general relativity | null | Eur. Phys. J. B 93, 208 (2020) | 10.1140/epjb/e2020-100557-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the nature of phase transitions between gaseous and condensed states
in the self-gravitating Fermi gas at nonzero temperature in general relativity.
The condensed states can represent compact objects such as white dwarfs,
neutron stars, or dark matter fermion balls. The caloric curves depend on two
parameter... | [
{
"created": "Thu, 2 Aug 2018 20:16:51 GMT",
"version": "v1"
}
] | 2020-12-30 | [
[
"Alberti",
"Giuseppe",
""
],
[
"Chavanis",
"Pierre-Henri",
""
]
] | We study the nature of phase transitions between gaseous and condensed states in the self-gravitating Fermi gas at nonzero temperature in general relativity. The condensed states can represent compact objects such as white dwarfs, neutron stars, or dark matter fermion balls. The caloric curves depend on two parameters:... |
1908.00189 | Shuang-Yong Zhou | Yu-Xin Huang, Jiu-Ci Xu, Shuang-Yong Zhou | The Fredholm Approach to Charactize Gravitational Wave Echoes | 15 pages, 4 figures; typos corrected, ref added | Phys. Rev. D 101, 024045 (2020) | 10.1103/PhysRevD.101.024045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves are a sensitive probe into the structure of compact
astronomical objects and the nature of gravity in the strong regime.
Modifications of near-horizon physics can imprint on the late time ringdown
waveform, leaving behind a train of echoes, from which useful information about
new physics in the st... | [
{
"created": "Thu, 1 Aug 2019 02:50:50 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Aug 2019 14:11:29 GMT",
"version": "v2"
}
] | 2020-01-29 | [
[
"Huang",
"Yu-Xin",
""
],
[
"Xu",
"Jiu-Ci",
""
],
[
"Zhou",
"Shuang-Yong",
""
]
] | Gravitational waves are a sensitive probe into the structure of compact astronomical objects and the nature of gravity in the strong regime. Modifications of near-horizon physics can imprint on the late time ringdown waveform, leaving behind a train of echoes, from which useful information about new physics in the stro... |
1603.05708 | Anzhong Wang | Kai Lin, V. H. Satheeshkumar, and Anzhong Wang | Static and rotating universal horizons and black holes in gravitational
theories with broken Lorentz invariance | revtex4, no tables, 21 figures. Typos were corrected. Phys. Rev. D93
(2016) 124025 | Phys. Rev. D 93, 124025 (2016) | 10.1103/PhysRevD.93.124025 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we show the existence of static and rotating universal
horizons and black holes in gravitational theories with the broken Lorentz
invariance. We pay particular attention on the ultraviolet regime, and show
that universal horizons and black holes exist not only in low energy scales but
also in the UV sc... | [
{
"created": "Thu, 17 Mar 2016 22:07:19 GMT",
"version": "v1"
},
{
"created": "Sat, 28 May 2016 09:03:25 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jun 2016 13:22:57 GMT",
"version": "v3"
}
] | 2016-06-15 | [
[
"Lin",
"Kai",
""
],
[
"Satheeshkumar",
"V. H.",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we show the existence of static and rotating universal horizons and black holes in gravitational theories with the broken Lorentz invariance. We pay particular attention on the ultraviolet regime, and show that universal horizons and black holes exist not only in low energy scales but also in the UV scal... |
1107.1817 | Sergio Ulhoa | S.C. Ulhoa | On Special Re-quantization of a Black Hole | 4 pages | Brazilian Journal of Physics, 41, 6th August, 2011 | 10.1007/s13538-011-0035-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantized expressions for the gravitational energy and momentum are derived
from a linearized theory of teleparallel gravity. The derivation relies on a
second-quantization procedure that constructs annihilation and creation
operators for the graviton. The resulting gravitational field is a collection
of gravitons, e... | [
{
"created": "Sat, 9 Jul 2011 21:02:55 GMT",
"version": "v1"
}
] | 2011-10-18 | [
[
"Ulhoa",
"S. C.",
""
]
] | Quantized expressions for the gravitational energy and momentum are derived from a linearized theory of teleparallel gravity. The derivation relies on a second-quantization procedure that constructs annihilation and creation operators for the graviton. The resulting gravitational field is a collection of gravitons, eac... |
2303.12089 | Ghulam Abbas | G. Abbas and R. H. Ali | Extended phase space thermodynamics of black hole with non-linear
electrodynamic field | 17 Pages, 21 Figures , To be published in Chinese Phys. C | null | 10.1088/1674-1137/acc56f | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | This paper deals with the thermodynamical properties of black hole formulated
in Einstein theory of relativity and associated with a nonlinear
electromagnetic field. The transition of the black hole is analyzed using the
parameters mass, electric charge, coupling constant, and cosmological constant.
We find-out the t... | [
{
"created": "Mon, 20 Mar 2023 20:16:07 GMT",
"version": "v1"
}
] | 2023-05-31 | [
[
"Abbas",
"G.",
""
],
[
"Ali",
"R. H.",
""
]
] | This paper deals with the thermodynamical properties of black hole formulated in Einstein theory of relativity and associated with a nonlinear electromagnetic field. The transition of the black hole is analyzed using the parameters mass, electric charge, coupling constant, and cosmological constant. We find-out the the... |
1004.4876 | Carlos Mayoral CM | A. Fabbri and C. Mayoral | Step-like discontinuities in Bose-Einstein condensates and Hawking
radiation: the hydrodynamic limit | 19 pages, 7 figures. Final version, to appear in Phys. Rev. D | Phys.Rev.D83:124016,2011 | 10.1103/PhysRevD.83.124016 | null | gr-qc cond-mat.quant-gas hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed analytical analysis of the propagation of Bogoliubov
phonons on top of Bose-Einstein condensates with spatial and temporal step-like
discontinuities in the hydrodynamic limit and focus on some features in the
correlations patterns, in particular of density-density correlations. The
application t... | [
{
"created": "Tue, 27 Apr 2010 18:08:14 GMT",
"version": "v1"
},
{
"created": "Fri, 13 May 2011 15:32:06 GMT",
"version": "v2"
}
] | 2011-06-24 | [
[
"Fabbri",
"A.",
""
],
[
"Mayoral",
"C.",
""
]
] | We present a detailed analytical analysis of the propagation of Bogoliubov phonons on top of Bose-Einstein condensates with spatial and temporal step-like discontinuities in the hydrodynamic limit and focus on some features in the correlations patterns, in particular of density-density correlations. The application to ... |
1012.4784 | Catherine Meusburger | Winston J. Fairbairn, Catherine Meusburger | Quantum deformation of two four-dimensional spin foam models | 45 pages, 4 figures, typos corrected, references added, proofs and
explanations extended for readability | J. Math. Phys. 53 (2012) 022501 | 10.1063/1.3675898 | ZMP-HH/10-24, hbm 398 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the q-deformed version of two four-dimensional spin foam models,
the Euclidean and Lorentzian versions of the EPRL model. The q-deformed models
are based on the representation theory of two copies of U_q(su(2)) at a root of
unity and on the quantum Lorentz group with a real deformation parameter. For
bot... | [
{
"created": "Tue, 21 Dec 2010 20:37:54 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jan 2011 14:05:35 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Feb 2012 10:11:44 GMT",
"version": "v3"
}
] | 2012-02-07 | [
[
"Fairbairn",
"Winston J.",
""
],
[
"Meusburger",
"Catherine",
""
]
] | We construct the q-deformed version of two four-dimensional spin foam models, the Euclidean and Lorentzian versions of the EPRL model. The q-deformed models are based on the representation theory of two copies of U_q(su(2)) at a root of unity and on the quantum Lorentz group with a real deformation parameter. For both ... |
1410.3495 | Stefan Stricker | R. Baier, Hiromichi Nishimura and S. A. Stricker | Scalar field collapse with negative cosmological constant | 16 pages, 6 figures, v3: final version to be published in Class.
Quantum Grav | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The formation of black holes or naked singularities is studied in a model in
which a homogeneous time-dependent scalar field with an exponential potential
couples to four dimensional gravity with negative cosmological constant. An
analytic solution is derived and its consequences are discussed. The model
depends only... | [
{
"created": "Mon, 13 Oct 2014 20:07:58 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Nov 2014 20:34:24 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Jun 2015 14:14:52 GMT",
"version": "v3"
}
] | 2015-06-10 | [
[
"Baier",
"R.",
""
],
[
"Nishimura",
"Hiromichi",
""
],
[
"Stricker",
"S. A.",
""
]
] | The formation of black holes or naked singularities is studied in a model in which a homogeneous time-dependent scalar field with an exponential potential couples to four dimensional gravity with negative cosmological constant. An analytic solution is derived and its consequences are discussed. The model depends only o... |
1302.6264 | Flavio Mercati | Julian Barbour, Tim Koslowski, Flavio Mercati | The Solution to the Problem of Time in Shape Dynamics | 14 pages, no figures | null | 10.1088/0264-9381/31/15/155001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The absence of unique time evolution in Einstein's spacetime description of
gravity leads to the hitherto unresolved `problem of time' in quantum gravity.
Shape Dynamics is an objectively equivalent representation of gravity that
trades spacetime refoliation invariance for three-dimensional conformal
invariance. Its ... | [
{
"created": "Mon, 25 Feb 2013 22:21:03 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Barbour",
"Julian",
""
],
[
"Koslowski",
"Tim",
""
],
[
"Mercati",
"Flavio",
""
]
] | The absence of unique time evolution in Einstein's spacetime description of gravity leads to the hitherto unresolved `problem of time' in quantum gravity. Shape Dynamics is an objectively equivalent representation of gravity that trades spacetime refoliation invariance for three-dimensional conformal invariance. Its lo... |
1209.2867 | Tomohiro Takahashi | Tomohiro Takahashi | Instability of Charged Lovelock Black Holes: Vector Perturbations and
Scalar Perturbations | 35pages, 8 figures | null | 10.1093/ptep/pts049 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the stability of charged Lovelock black hole solutions under
vector type and scalar type perturbations. We find the suitable master
variables for the stability analysis; the equations for these variables are the
Schrodinger type equations with two components and these Schrodinger operators
are symmetric. B... | [
{
"created": "Thu, 13 Sep 2012 12:09:25 GMT",
"version": "v1"
}
] | 2016-06-21 | [
[
"Takahashi",
"Tomohiro",
""
]
] | We examine the stability of charged Lovelock black hole solutions under vector type and scalar type perturbations. We find the suitable master variables for the stability analysis; the equations for these variables are the Schrodinger type equations with two components and these Schrodinger operators are symmetric. By ... |
1411.3280 | Stefan Floerchinger | Stefan Floerchinger, Nikolaos Tetradis, Urs Achim Wiedemann | Accelerating cosmological expansion from shear and bulk viscosity | 5 pages, 1 figure, published version | Phys. Rev. Lett. 114, 091301 (2015) | 10.1103/PhysRevLett.114.091301 | CERN-PH-TH-2014-224 | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dissipation of energy from local velocity perturbations in the
cosmological fluid affects the time evolution of spatially averaged fluid
dynamic fields and the cosmological solution of Einstein's field equations. We
show how this backreaction effect depends on shear and bulk viscosity and other
material propertie... | [
{
"created": "Tue, 11 Nov 2014 18:33:26 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2015 13:41:10 GMT",
"version": "v2"
}
] | 2015-03-11 | [
[
"Floerchinger",
"Stefan",
""
],
[
"Tetradis",
"Nikolaos",
""
],
[
"Wiedemann",
"Urs Achim",
""
]
] | The dissipation of energy from local velocity perturbations in the cosmological fluid affects the time evolution of spatially averaged fluid dynamic fields and the cosmological solution of Einstein's field equations. We show how this backreaction effect depends on shear and bulk viscosity and other material properties ... |
gr-qc/9409056 | Dalia Goldwirth | Nathalie Deruelle and Dalia S. Goldwirth | Conditions for inflation in an initially inhomogeneous universe | 9 pages, plain Tex, gr-qc/yymmnnn | Phys.Rev. D51 (1995) 1563-1568 | 10.1103/PhysRevD.51.1563 | null | gr-qc astro-ph | null | Using a long wavelength iteration scheme to solve Einstein's equations near
the Big-Bang singularity of a universe driven by a massive scalar field, we
find how big initial quasi-isotropic inhomogeneities can be before they can
prevent inflation to set in.
| [
{
"created": "Tue, 27 Sep 1994 16:04:41 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Deruelle",
"Nathalie",
""
],
[
"Goldwirth",
"Dalia S.",
""
]
] | Using a long wavelength iteration scheme to solve Einstein's equations near the Big-Bang singularity of a universe driven by a massive scalar field, we find how big initial quasi-isotropic inhomogeneities can be before they can prevent inflation to set in. |
1406.3087 | Sanjay Jhingan | Sanjay Jhingan and Sahal Kaushik | On the global visibility of a singularity in spherically symmetric
gravitational collapse | 8 pages, 4 pdf figures, to appear in Phys. Rev. D | Physical Review D 90, 024009 (2014) | 10.1103/PhysRevD.90.024009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the gravitational collapse of spherically symmetric Lema\^itre -
Tolman - Bondi (LTB) dust models. A sufficient condition for global visibility
of singularity is given. This condition also allows us to extend the condition
of local visibility to mass functions which are not Taylor expandable near the
centr... | [
{
"created": "Thu, 12 Jun 2014 00:13:06 GMT",
"version": "v1"
}
] | 2021-02-04 | [
[
"Jhingan",
"Sanjay",
""
],
[
"Kaushik",
"Sahal",
""
]
] | We revisit the gravitational collapse of spherically symmetric Lema\^itre - Tolman - Bondi (LTB) dust models. A sufficient condition for global visibility of singularity is given. This condition also allows us to extend the condition of local visibility to mass functions which are not Taylor expandable near the centre. |
gr-qc/0410056 | Bijan Saha | Bijan Saha and V. Rikhvitsky | Bianchi type I universe with viscous fluid: A qualitative analysis | RevTex, 16 pages, 32 figures | Physica D219 (2006) 168-176 | 10.1016/j.physd.2006.06.003 | null | gr-qc | null | The nature of cosmological solutions for a homogeneous, anisotropic Universe
given by a Bianchi type-I (BI) model in the presence of a Cosmological constant
$\Lambda$ is investigated by taking into account dissipative process due to
viscosity. The system in question is thoroughly studied both analytically and
numeric... | [
{
"created": "Wed, 13 Oct 2004 14:37:46 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Saha",
"Bijan",
""
],
[
"Rikhvitsky",
"V.",
""
]
] | The nature of cosmological solutions for a homogeneous, anisotropic Universe given by a Bianchi type-I (BI) model in the presence of a Cosmological constant $\Lambda$ is investigated by taking into account dissipative process due to viscosity. The system in question is thoroughly studied both analytically and numerical... |
2109.06010 | Muhammad Sharif | M. Sharif and Amjad Khan | Effects of Non-linear Electrodynamics on Thermodynamics of Charged Black
Hole | 29 pages, 11 figures, to appear in Chinese J. Phys | Chinese J. Phys. 77(2022)1130-1144 | 10.1016/j.cjph.2021.08.026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates thermodynamics, quasi-normal modes, thermal
fluctuations and phase transitions of Reissner-Nordstr\"om black hole with the
effects of non-linear electrodynamics. We first compute the expressions for
Hawking temperature, entropy and heat capacity of this black hole and then
obtain a relation be... | [
{
"created": "Wed, 1 Sep 2021 03:40:54 GMT",
"version": "v1"
}
] | 2022-05-10 | [
[
"Sharif",
"M.",
""
],
[
"Khan",
"Amjad",
""
]
] | This paper investigates thermodynamics, quasi-normal modes, thermal fluctuations and phase transitions of Reissner-Nordstr\"om black hole with the effects of non-linear electrodynamics. We first compute the expressions for Hawking temperature, entropy and heat capacity of this black hole and then obtain a relation betw... |
1705.10984 | Christoph Charles | Christoph Charles | Renormalization and Coarse-graining of Loop Quantum Gravity | PhD Thesis, Ecole Normale Superieure de Lyon, 303pages, many figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The continuum limit of loop quantum gravity is still an open problem. Indeed,
no proper dynamics in known to start with and we still lack the mathematical
tools to study its would-be continuum limit. In the present PhD dissertation,
we will investigate some coarse-graining methods that should become helpful in
this e... | [
{
"created": "Wed, 31 May 2017 08:38:14 GMT",
"version": "v1"
}
] | 2017-06-01 | [
[
"Charles",
"Christoph",
""
]
] | The continuum limit of loop quantum gravity is still an open problem. Indeed, no proper dynamics in known to start with and we still lack the mathematical tools to study its would-be continuum limit. In the present PhD dissertation, we will investigate some coarse-graining methods that should become helpful in this ent... |
1705.08938 | Stanley Deser | S.Deser | Higher curvature gravities, unlike GR, cannot be bootstrapped from their
(usual) linearizations | New title, reflecting essential changes in text and conclusions. GRG
in press | Gen Relativ Grav 49(2017)149 | 10.1007/s10714-017-2308-6 | BRX TH-6319 , CALT-TH 2017-25 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that higher curvature order gravities, in particular the propagating
quadratic curvature models, cannot be derived by self-coupling from their
linear, flat space, forms, except through an unphysical version of
linearization; only GR can. Separately, we comment on an early version of the
self-coupling bootstra... | [
{
"created": "Wed, 24 May 2017 19:34:13 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Oct 2017 21:19:35 GMT",
"version": "v2"
}
] | 2017-11-08 | [
[
"Deser",
"S.",
""
]
] | We show that higher curvature order gravities, in particular the propagating quadratic curvature models, cannot be derived by self-coupling from their linear, flat space, forms, except through an unphysical version of linearization; only GR can. Separately, we comment on an early version of the self-coupling bootstrap. |
1810.06332 | Lijing Shao | Lijing Shao, Quentin G. Bailey | Testing velocity-dependent CPT-violating gravitational forces with radio
pulsars | 12 pages, 2 figures, 6 tables; Physical Review D, in press | Phys. Rev. D 98, 084049 (2018) | 10.1103/PhysRevD.98.084049 | MITP/18-086 | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the spirit of effective field theory, the Standard-Model Extension (SME)
provides a comprehensive framework to systematically probe the possibility of
Lorentz/CPT violation. In the pure gravity sector, operators with mass
dimension larger than 4, while in general being advantageous to short-range
experiments, are ... | [
{
"created": "Mon, 15 Oct 2018 13:09:52 GMT",
"version": "v1"
}
] | 2018-10-30 | [
[
"Shao",
"Lijing",
""
],
[
"Bailey",
"Quentin G.",
""
]
] | In the spirit of effective field theory, the Standard-Model Extension (SME) provides a comprehensive framework to systematically probe the possibility of Lorentz/CPT violation. In the pure gravity sector, operators with mass dimension larger than 4, while in general being advantageous to short-range experiments, are ha... |
gr-qc/0603131 | Kishore Ananda N | Kishore N. Ananda, Marco Bruni (ICG, Portsmouth) | Cosmo-dynamics and dark energy with a quadratic EoS: anisotropic models,
large-scale perturbations and cosmological singularities | 16 pages, 6 figures | Phys.Rev. D74 (2006) 023524 | 10.1103/PhysRevD.74.023524 | null | gr-qc astro-ph hep-th | null | In general relativity, for fluids with a linear equation of state (EoS) or
scalar fields, the high isotropy of the universe requires special initial
conditions, and singularities are anisotropic in general. In the brane world
scenario anisotropy at the singularity is suppressed by an effective quadratic
equation of s... | [
{
"created": "Fri, 31 Mar 2006 11:12:50 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ananda",
"Kishore N.",
"",
"ICG, Portsmouth"
],
[
"Bruni",
"Marco",
"",
"ICG, Portsmouth"
]
] | In general relativity, for fluids with a linear equation of state (EoS) or scalar fields, the high isotropy of the universe requires special initial conditions, and singularities are anisotropic in general. In the brane world scenario anisotropy at the singularity is suppressed by an effective quadratic equation of sta... |
1308.0523 | Rampei Kimura | Rampei Kimura, Daisuke Yamauchi | Derivative interactions in de Rham-Gabadadze-Tolley massive gravity | 14 pages, v2: published in PRD | Phys. Rev. D 88, 084025 (2013) | 10.1103/PhysRevD.88.084025 | RESCEU-40/13 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility of a new massive gravity theory with
derivative interactions as an extension of de Rham-Gabadadze-Tolley massive
gravity. We find the most general Lagrangian of derivative interactions using
Riemann tensor whose cutoff energy scale is $\Lambda_3$, which is consistent
with de Rham-Gabada... | [
{
"created": "Fri, 2 Aug 2013 15:12:19 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Oct 2013 05:28:07 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Kimura",
"Rampei",
""
],
[
"Yamauchi",
"Daisuke",
""
]
] | We investigate the possibility of a new massive gravity theory with derivative interactions as an extension of de Rham-Gabadadze-Tolley massive gravity. We find the most general Lagrangian of derivative interactions using Riemann tensor whose cutoff energy scale is $\Lambda_3$, which is consistent with de Rham-Gabadadz... |
2402.18570 | Richard Norte | Richard A. Norte | Negative Temperature Pressure in Black Holes | null | null | 10.1209/0295-5075/ad2088 | null | gr-qc cond-mat.stat-mech hep-th physics.space-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | The concept of negative temperature (T < 0) is unique to quantum physics and
describes systems that are hotter than any positive temperature system. For
decades negative temperatures have been shown in a number of spin systems, but
experiments only recently demonstrated atomic ensembles with negative
temperatures in ... | [
{
"created": "Wed, 28 Feb 2024 18:58:18 GMT",
"version": "v1"
}
] | 2024-02-29 | [
[
"Norte",
"Richard A.",
""
]
] | The concept of negative temperature (T < 0) is unique to quantum physics and describes systems that are hotter than any positive temperature system. For decades negative temperatures have been shown in a number of spin systems, but experiments only recently demonstrated atomic ensembles with negative temperatures in th... |
1501.00663 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev | Cosmological constant, supersymmetry, nonassociativity, and Big Numbers | essential changes in the text | The European Physical Journal C February 2015, 75:86 | 10.1140/epjc/s10052-015-3309-9 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nonassociative generalization of supersymmetry is considered. It is shown
that the associator of four supersymmetry generators has the coefficient $\sim
\hbar/ \ell_0^2$ where $\ell_0$ is some characteristic length. Two cases are
considered: (a) $\ell_0^{-2}$ coincides with the cosmological constant; (b)
$\ell_0$... | [
{
"created": "Sun, 4 Jan 2015 10:52:51 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 2015 06:00:49 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Feb 2015 18:21:27 GMT",
"version": "v3"
}
] | 2015-04-02 | [
[
"Dzhunushaliev",
"Vladimir",
""
]
] | The nonassociative generalization of supersymmetry is considered. It is shown that the associator of four supersymmetry generators has the coefficient $\sim \hbar/ \ell_0^2$ where $\ell_0$ is some characteristic length. Two cases are considered: (a) $\ell_0^{-2}$ coincides with the cosmological constant; (b) $\ell_0$ i... |
1303.0746 | Valerio Faraoni | Valerio Faraoni and Thomas P. Sotiriou | Absence of scalar hair in scalar-tensor gravity | 3 pages, latex, prepared for the proceedings of the 13th Marcel
Grossman Meeting, Stockholm 2012 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stationary, asymptotically flat black holes in scalar-tensor theories of
gravity are studied. It is shown that such black holes have no scalar hair and
are the same as in General Relativity.
| [
{
"created": "Mon, 4 Mar 2013 16:12:27 GMT",
"version": "v1"
}
] | 2013-03-05 | [
[
"Faraoni",
"Valerio",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | Stationary, asymptotically flat black holes in scalar-tensor theories of gravity are studied. It is shown that such black holes have no scalar hair and are the same as in General Relativity. |
gr-qc/0504123 | Victor N. Pervushin | V.N. Pervushin, V.A. Zinchuk | Quantum Cosmological Origin of Universes | 25 pages, 2 figures, Invited talk at the XXXIX PNPI Winter School on
Nuclear Particle Physics and XI St.Petersburg School on Theoretical Physics
(St.Petersburg, Repino, February 14 - 20, 2005)
http://hepd.pnpi.spb.ru/WinterSchool/ | null | null | null | gr-qc astro-ph hep-th | null | A direct pathway from Hilbert's ``Foundation of Physics'' to Quantum Gravity
is established through Dirac's Hamiltonian reduction of General Relativity and
Bogoliubov's transformation by analogy with a similar pathway passed by QFT in
20th century. The cosmological scale factor appears on this pathway as a zero
mode ... | [
{
"created": "Mon, 25 Apr 2005 16:28:21 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2005 13:05:19 GMT",
"version": "v2"
},
{
"created": "Fri, 6 May 2005 13:49:30 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Pervushin",
"V. N.",
""
],
[
"Zinchuk",
"V. A.",
""
]
] | A direct pathway from Hilbert's ``Foundation of Physics'' to Quantum Gravity is established through Dirac's Hamiltonian reduction of General Relativity and Bogoliubov's transformation by analogy with a similar pathway passed by QFT in 20th century. The cosmological scale factor appears on this pathway as a zero mode of... |
2002.12031 | Fazlay Ahmed | Fazlay Ahmed, Dharm Veer Singh and Sushant G. Ghosh | Five dimensional rotating regular black holes and shadow | 23 pages, 9 figures | Gen. Rel. Grav. 54 (2022) 2, 21 | 10.1007/s10714-022-02906-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an exact five-dimensional ($5D$) rotating regular black hole
metric, with a deviation parameter $k\geq 0$, that interpolates between the
$5D$ Kerr black hole ($k=0$) and $5D$ Kerr-Newman ($r \gg k$). This $5D$
rotating regular black hole is an exact solution of general relativity coupled
to nonlinear elect... | [
{
"created": "Thu, 27 Feb 2020 10:59:50 GMT",
"version": "v1"
}
] | 2022-06-02 | [
[
"Ahmed",
"Fazlay",
""
],
[
"Singh",
"Dharm Veer",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | We present an exact five-dimensional ($5D$) rotating regular black hole metric, with a deviation parameter $k\geq 0$, that interpolates between the $5D$ Kerr black hole ($k=0$) and $5D$ Kerr-Newman ($r \gg k$). This $5D$ rotating regular black hole is an exact solution of general relativity coupled to nonlinear electro... |
2002.12719 | Caio Macedo | Caio F. B. Macedo | Scalar modes, spontaneous scalarization and circular null-geodesics of
black holes in scalar-Gauss-Bonnet gravity | 18 pages, 8 figures. Submitted to IJMPD, as invited contribution of
the Fifth Amazonian Symposium on Physics | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity, astrophysical black holes are simple objects, being
described by just their mass and spin. These simple solutions are not exclusive
to general relativity, as they also appear in theories that allow for an extra
scalar degree of freedom. Recently, it was shown that some theories which
couple a s... | [
{
"created": "Fri, 28 Feb 2020 14:05:27 GMT",
"version": "v1"
}
] | 2020-03-02 | [
[
"Macedo",
"Caio F. B.",
""
]
] | In general relativity, astrophysical black holes are simple objects, being described by just their mass and spin. These simple solutions are not exclusive to general relativity, as they also appear in theories that allow for an extra scalar degree of freedom. Recently, it was shown that some theories which couple a sca... |
2005.01636 | Zahra Haghani | Zahra Haghani | Growth of matter density perturbations in 4D Einstein-Gauss-Bonnet
gravity | 7 pages, 6 figures | PDU 30, 100720 (2020) | 10.1016/j.dark.2020.100720 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a novel Einstein-Gauss-Bonnet gravity in four dimensions has been
introduced [Phys. Rev. Lett. 124 (2020) 081301]. We will investigate
cosmological consequences of this model in details. We will consider linear
matter density perturbations and also estimate relevant modified gravity
parameters. Specially we... | [
{
"created": "Mon, 4 May 2020 16:50:41 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jun 2020 13:56:19 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Oct 2020 20:40:59 GMT",
"version": "v3"
}
] | 2020-10-05 | [
[
"Haghani",
"Zahra",
""
]
] | Recently, a novel Einstein-Gauss-Bonnet gravity in four dimensions has been introduced [Phys. Rev. Lett. 124 (2020) 081301]. We will investigate cosmological consequences of this model in details. We will consider linear matter density perturbations and also estimate relevant modified gravity parameters. Specially we w... |
1308.0077 | Willians Barreto | W. Barreto (ULA) | An evolution of adiabatic matter: A case for the quasistatic regime | 19 pages; 8 figure; to appear in GRG | Gen. Rel. Grav. 45, 2223 (2013) | 10.1007/s10714-013-1580-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the connection between the standard ADM 3+1 treatment of matter
with its characteristic equivalent, in the context of spherical symmetry. The
flux-conservative rendition of the fluid equations are obtained. Considering
adiabatic distributions of perfect fluid, we evolve the system using the
so-called pos... | [
{
"created": "Thu, 1 Aug 2013 01:58:42 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Barreto",
"W.",
"",
"ULA"
]
] | We establish the connection between the standard ADM 3+1 treatment of matter with its characteristic equivalent, in the context of spherical symmetry. The flux-conservative rendition of the fluid equations are obtained. Considering adiabatic distributions of perfect fluid, we evolve the system using the so-called post-... |
gr-qc/9805006 | Yavuz Nutku | A. N. Aliev and Y. Nutku | Gravitational instantons admit hyper-K\"ahler structure | Extensive revision | null | 10.1088/0264-9381/16/1/013 | null | gr-qc | null | We construct the explicit form of three almost complex structures that a
Riemannian manifold with self-dual curvature admits and show that their
Nijenhuis tensors vanish so that they are integrable. This proves that
gravitational instantons with self-dual curvature admit hyper-K\"{a}hler
structure. In order to arrive... | [
{
"created": "Mon, 4 May 1998 14:18:51 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 1998 10:51:37 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Aliev",
"A. N.",
""
],
[
"Nutku",
"Y.",
""
]
] | We construct the explicit form of three almost complex structures that a Riemannian manifold with self-dual curvature admits and show that their Nijenhuis tensors vanish so that they are integrable. This proves that gravitational instantons with self-dual curvature admit hyper-K\"{a}hler structure. In order to arrive a... |
gr-qc/9711013 | Rafael A. Vera | Rafael A. Vera (Dep. Fisica, Facultad de Ciencias Fisicas y
Matematicas, Universidad de Concepcion, Concepcion, Chile) | Nonlocal Conservation Laws Derived from an Explicit Equivalence
Principle | 9 pages, Latex. Presented in the Eigth Marcel Grossmann Meeting on
GR. To appear (more compressed) in its Proceedings | null | null | UCDFRVM 972 | gr-qc | null | According to this principle (EEP), in order that the local physical laws
cannot change, after changes of velocity and potentials of a measuring system,
the relativistic changes of any particle and any stationary radiation (like
those used to measure it) must occur in identical proportion. Thus particles
and stationar... | [
{
"created": "Wed, 5 Nov 1997 15:05:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vera",
"Rafael A.",
"",
"Dep. Fisica, Facultad de Ciencias Fisicas y\n Matematicas, Universidad de Concepcion, Concepcion, Chile"
]
] | According to this principle (EEP), in order that the local physical laws cannot change, after changes of velocity and potentials of a measuring system, the relativistic changes of any particle and any stationary radiation (like those used to measure it) must occur in identical proportion. Thus particles and stationary ... |
2203.13295 | Zacharias Roupas | Zacharias Roupas | Detectable universes inside regular black holes | Citing Virgo properly in version 2 | European Physical Journal C 82:255 (2022) | 10.1140/epjc/s10052-022-10202-6 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While spacetime in the vicinity outside astrophysical black holes is believed
to be well understood, the event horizon and the interior remain elusive. Here,
we discover a degenerate infinite spectrum of novel general relativity
solutions with the same mass-energy and entropy that describe a dark energy
universe insi... | [
{
"created": "Thu, 24 Mar 2022 18:48:15 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2022 17:58:00 GMT",
"version": "v2"
}
] | 2022-04-18 | [
[
"Roupas",
"Zacharias",
""
]
] | While spacetime in the vicinity outside astrophysical black holes is believed to be well understood, the event horizon and the interior remain elusive. Here, we discover a degenerate infinite spectrum of novel general relativity solutions with the same mass-energy and entropy that describe a dark energy universe inside... |
gr-qc/0608091 | Ernst Nils Dorband | Ernst Nils Dorband, Emanuele Berti, Peter Diener, Erik Schnetter and
Manuel Tiglio | A numerical study of the quasinormal mode excitation of Kerr black holes | 21 pages, 9 figures | Phys.Rev.D74:084028,2006 | 10.1103/PhysRevD.74.084028 | LSU-REL-081806 | gr-qc astro-ph | null | We present numerical results from three-dimensional evolutions of scalar
perturbations of Kerr black holes. Our simulations make use of a high-order
accurate multi-block code which naturally allows for fixed adaptivity and
smooth inner (excision) and outer boundaries. We focus on the quasinormal
ringing phase, presen... | [
{
"created": "Fri, 18 Aug 2006 20:52:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dorband",
"Ernst Nils",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Diener",
"Peter",
""
],
[
"Schnetter",
"Erik",
""
],
[
"Tiglio",
"Manuel",
""
]
] | We present numerical results from three-dimensional evolutions of scalar perturbations of Kerr black holes. Our simulations make use of a high-order accurate multi-block code which naturally allows for fixed adaptivity and smooth inner (excision) and outer boundaries. We focus on the quasinormal ringing phase, presenti... |
1606.00703 | Chen Wu | Chen Wu | Scalar field quasinormal frequencies of Reissner-Nordstr\"om black hole
surrounded by quintessence by using he continued fraction method | 17 pages, 2 figures | null | 10.1142/S0218271817501115 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We evaluate the quasinormal modes of massless scalar field around
Reissner-Nordstr$\ddot{\text{o}}$m black hole surrounded by a static and
spherically symmetric quintessence by using the continued fraction method. The
appropriate Frobenius series for three special cases of the quintessence
parameter $ \epsilon = -1/3... | [
{
"created": "Fri, 27 May 2016 08:51:13 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jun 2016 05:24:52 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Nov 2016 00:39:06 GMT",
"version": "v3"
}
] | 2017-09-06 | [
[
"Wu",
"Chen",
""
]
] | We evaluate the quasinormal modes of massless scalar field around Reissner-Nordstr$\ddot{\text{o}}$m black hole surrounded by a static and spherically symmetric quintessence by using the continued fraction method. The appropriate Frobenius series for three special cases of the quintessence parameter $ \epsilon = -1/3, ... |
1403.6932 | Yuri Pavlov | Yu. V. Pavlov | On creation of scalar particles with Gauss-Bonnet type coupling to
curvature in Friedmann cosmological models | 6 pages, 3 figures | Grav. Cosmol. 20, No. 1, (2014) 21-25 | 10.1134/S0202289314010101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Calculations are presented for creation of massive and massless scalar
particles coupled to Gauss-Bonnet type curvature in Friedmann cosmological
models. It has been shown that, for fields of mass~$m$, the effect of the
coupling parameter $\zeta$ with the Gauss-Bonnet invariant is insignificant if
$\zeta m^2 \ll 1 $.... | [
{
"created": "Thu, 27 Mar 2014 07:26:07 GMT",
"version": "v1"
}
] | 2014-04-01 | [
[
"Pavlov",
"Yu. V.",
""
]
] | Calculations are presented for creation of massive and massless scalar particles coupled to Gauss-Bonnet type curvature in Friedmann cosmological models. It has been shown that, for fields of mass~$m$, the effect of the coupling parameter $\zeta$ with the Gauss-Bonnet invariant is insignificant if $\zeta m^2 \ll 1 $. I... |
0704.3414 | Burin Gumjudpai | Daris Samart and Burin Gumjudpai (TPTP Naresuan U.) | Phantom field dynamics in loop quantum cosmology | 8 pages, 6 figures, Revtex 4, Figures and References added. Version
accepted by Physical Review D15 | Phys.Rev.D76:043514,2007 | 10.1103/PhysRevD.76.043514 | null | gr-qc astro-ph hep-ph | null | We consider a dynamical system of phantom scalar field under exponential
potential in background of loop quantum cosmology. In our analysis, there is
neither stable node nor repeller unstable node but only two saddle points,
hence no Big Rip singularity. Physical solutions always possess potential
energy greater than... | [
{
"created": "Wed, 25 Apr 2007 17:25:35 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2007 08:51:53 GMT",
"version": "v2"
},
{
"created": "Sat, 7 Jul 2007 05:36:51 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Samart",
"Daris",
"",
"TPTP Naresuan U."
],
[
"Gumjudpai",
"Burin",
"",
"TPTP Naresuan U."
]
] | We consider a dynamical system of phantom scalar field under exponential potential in background of loop quantum cosmology. In our analysis, there is neither stable node nor repeller unstable node but only two saddle points, hence no Big Rip singularity. Physical solutions always possess potential energy greater than m... |
1201.5806 | Ernest Tagirov | E. A. Tagirov (Joint Institute for Nuclear Research, Dubna, Russia) | Unfinished History and Paradoxes of Quantum Potential. II. Relativistic
Point of View | 15 pages, based on the plenary talk at the A. Z. Petrov Centenary
Memorial International Symposium, 1-7.11.2010, Kazan, Russia. Few errors are
corrected and minor improving changes are introduced into Chapters 4 - 7 | null | 10.1134/S0202289313010106 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the second of the two related papers analysing origins and possible
explanations of a paradoxical phenomenon of the quantum potential (QP). It
arises in quantum mechanics'(QM) of a particle in the Riemannian
$n$-dimensional configurational space obtained by various procedures of
quantization of the non-relati... | [
{
"created": "Fri, 27 Jan 2012 15:53:23 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2012 16:59:37 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Tagirov",
"E. A.",
"",
"Joint Institute for Nuclear Research, Dubna, Russia"
]
] | This is the second of the two related papers analysing origins and possible explanations of a paradoxical phenomenon of the quantum potential (QP). It arises in quantum mechanics'(QM) of a particle in the Riemannian $n$-dimensional configurational space obtained by various procedures of quantization of the non-relativi... |
1912.01016 | Roberto Oliveri | Roberto Oliveri and Simone Speziale | Boundary effects in General Relativity with tetrad variables | 47 pages, 1 figure; v2: improved text, updated refs, Sec.(VI.E)
rewritten and extended with Kosmann derivative, Eq.(VII.5) corrected | Gen. Relativ. Gravit. 52, 83 (2020) | 10.1007/s10714-020-02733-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Varying the gravitational Lagrangian produces a boundary contribution that
has various physical applications. It determines the right boundary terms to be
added to the action once boundary conditions are specified, and defines the
symplectic structure of covariant phase space methods. We study general
boundary variat... | [
{
"created": "Mon, 2 Dec 2019 19:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 2020 17:25:56 GMT",
"version": "v2"
}
] | 2020-09-09 | [
[
"Oliveri",
"Roberto",
""
],
[
"Speziale",
"Simone",
""
]
] | Varying the gravitational Lagrangian produces a boundary contribution that has various physical applications. It determines the right boundary terms to be added to the action once boundary conditions are specified, and defines the symplectic structure of covariant phase space methods. We study general boundary variatio... |
2211.01691 | Bahram Mashhoon | Bahram Mashhoon and Sohrab Rahvar | Properties and Patterns of Polarized Gravitational Waves | 22 pages; v2: presentation improved, references added, invited
contribution to appear in Universe; v3: minor improvements | Universe 9, 6 (2023) | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We discuss polarization of gravitational radiation within the standard
framework of linearized general relativity. The recent experimental discovery
of gravitational waves provides the impetus to revisit the implications of the
spin-rotation-gravity coupling for polarized gravitational radiation;
therefore, we consid... | [
{
"created": "Thu, 3 Nov 2022 10:23:07 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2022 19:25:39 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Dec 2022 17:39:47 GMT",
"version": "v3"
}
] | 2022-12-22 | [
[
"Mashhoon",
"Bahram",
""
],
[
"Rahvar",
"Sohrab",
""
]
] | We discuss polarization of gravitational radiation within the standard framework of linearized general relativity. The recent experimental discovery of gravitational waves provides the impetus to revisit the implications of the spin-rotation-gravity coupling for polarized gravitational radiation; therefore, we consider... |
gr-qc/0106052 | Fernando SAN JOSE Martinez | B. Coll and F. San Jose Martinez | Composition of Lorentz Transformations in Terms of Their Generators | 16 pages, no figures | Gen.Rel.Grav. 34 (2002) 1345-1356 | 10.1023/A:1020018616308 | null | gr-qc | null | Two-forms in Minkowski space-time may be considered as generators of Lorentz
transformations. Here, the covariant and general expression for the composition
law (Baker-Campbell-Hausdorff formula) of two Lorentz transformations in terms
of their generators is obtained. Every subalgebra of the Lorentz algebra of
such g... | [
{
"created": "Fri, 15 Jun 2001 10:23:25 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Coll",
"B.",
""
],
[
"Martinez",
"F. San Jose",
""
]
] | Two-forms in Minkowski space-time may be considered as generators of Lorentz transformations. Here, the covariant and general expression for the composition law (Baker-Campbell-Hausdorff formula) of two Lorentz transformations in terms of their generators is obtained. Every subalgebra of the Lorentz algebra of such gen... |
gr-qc/0410132 | Christof Wetterich | C.Wetterich | Invariants and nonlinear fields in Spinor Gravity | 18 pages | null | null | HD-THEP-04-05 | gr-qc hep-th | null | Spinor gravity is a functional integral formulation of gravity based only on
fundamental spinor fields. The vielbein and metric arise as composite objects.
Due to the lack of local Lorentz-symmetry new invariants in the effective
gravitational action lead to a modification of Einstein's equations. We discuss
differen... | [
{
"created": "Wed, 27 Oct 2004 10:33:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wetterich",
"C.",
""
]
] | Spinor gravity is a functional integral formulation of gravity based only on fundamental spinor fields. The vielbein and metric arise as composite objects. Due to the lack of local Lorentz-symmetry new invariants in the effective gravitational action lead to a modification of Einstein's equations. We discuss different ... |
gr-qc/9910105 | Jean-Paul Mbelek | J.P. Mbelek (Service d'Astrophysique, CEA, Saclay, France), M.
Lachi\`eze-Rey (Service d'Astrophysique, CEA, Saclay, France) | Long-range acceleration induced by a scalar field external to gravity
and the indication from Pioneer 10/11, Galileo and Ulysses Data | Latex, 23 pages with 3 Postscript figures, submitted to Physical
Review D | null | null | null | gr-qc | null | We suggest an explanation of the "Pioneer effect" based on the interaction of
the spacecraft with a long-range scalar field, $\phi$. The scalar field under
consideration is external to gravity, coupled to the ordinary matter and
undergoes obedience to the weak equivalence principle. In the weak fields limit
it result... | [
{
"created": "Thu, 28 Oct 1999 13:49:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mbelek",
"J. P.",
"",
"Service d'Astrophysique, CEA, Saclay, France"
],
[
"Lachièze-Rey",
"M.",
"",
"Service d'Astrophysique, CEA, Saclay, France"
]
] | We suggest an explanation of the "Pioneer effect" based on the interaction of the spacecraft with a long-range scalar field, $\phi$. The scalar field under consideration is external to gravity, coupled to the ordinary matter and undergoes obedience to the weak equivalence principle. In the weak fields limit it result a... |
1511.03960 | Jose Luis Bl\'azquez-Salcedo | Jose Luis Bl\'azquez-Salcedo, Luis Manuel Gonz\'alez-Romero, Jutta
Kunz, Sindy Mojica and Francisco Navarro-L\'erida | Axial quasi-normal modes of Einstein-Gauss-Bonnet-dilaton neutron stars | 15 pages, 9 figures | Phys. Rev. D 93, 024052 (2016) | 10.1103/PhysRevD.93.024052 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate axial quasi-normal modes of realistic neutron stars in
Einstein-Gauss-Bonnet-dilaton gravity. We consider 8 realistic equations of
state containing nuclear, hyperonic, and hybrid matter. We focus on the
fundamental curvature mode and compare the results with those of pure Einstein
theory. We observe th... | [
{
"created": "Thu, 12 Nov 2015 16:45:36 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 2016 14:01:26 GMT",
"version": "v2"
}
] | 2016-02-03 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"González-Romero",
"Luis Manuel",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Mojica",
"Sindy",
""
],
[
"Navarro-Lérida",
"Francisco",
""
]
] | We investigate axial quasi-normal modes of realistic neutron stars in Einstein-Gauss-Bonnet-dilaton gravity. We consider 8 realistic equations of state containing nuclear, hyperonic, and hybrid matter. We focus on the fundamental curvature mode and compare the results with those of pure Einstein theory. We observe that... |
1904.04926 | Elena Giorgi | Elena Giorgi | The linear stability of Reissner-Nordstr\"om spacetime for small charge | 121 pages, 2 figures, version accepted for publication | Ann. PDE 6, 8 (2020) | 10.1007/s40818-020-00082-y | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we prove the linear stability to gravitational and
electromagnetic perturbations of the Reissner-Nordstr\"om family of charged
black holes with small charge. Solutions to the linearized Einstein-Maxwell
equations around a Reissner-Nordstr\"om solution arising from regular initial
data remain globally b... | [
{
"created": "Tue, 9 Apr 2019 21:51:03 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 2020 15:07:58 GMT",
"version": "v2"
}
] | 2020-09-03 | [
[
"Giorgi",
"Elena",
""
]
] | In this paper, we prove the linear stability to gravitational and electromagnetic perturbations of the Reissner-Nordstr\"om family of charged black holes with small charge. Solutions to the linearized Einstein-Maxwell equations around a Reissner-Nordstr\"om solution arising from regular initial data remain globally bou... |
gr-qc/9805030 | Lawrence C. Shepley | J. M. Pons, L. C. Shepley | Dimensional reduction and gauge group reduction in Bianchi-Type
cosmology | 2-column format; 19 pages; to appear in Phys. Rev. D15-3 | Phys.Rev. D58 (1998) 024001 | 10.1103/PhysRevD.58.024001 | null | gr-qc | null | In this paper we examine in detail the implementation, with its associated
difficulties, of the Killing conditions and gauge fixing into the variational
principle formulation of Bianchi-Type cosmologies. We address problems raised
in the literature concerning the Lagrangian and the Hamiltonian formulations:
We prove ... | [
{
"created": "Sat, 9 May 1998 19:19:02 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Pons",
"J. M.",
""
],
[
"Shepley",
"L. C.",
""
]
] | In this paper we examine in detail the implementation, with its associated difficulties, of the Killing conditions and gauge fixing into the variational principle formulation of Bianchi-Type cosmologies. We address problems raised in the literature concerning the Lagrangian and the Hamiltonian formulations: We prove th... |
0902.4749 | Muhammad Sharif | M. Sharif and Naghmana Tehseen | Conformal Ricci and Matter Collineations for Two Perfect Fluids | 15 pages, accepted for publication Chinse J. Physics | Chinese J. Physics 47(2009)115-133 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conformal Ricci and conformal matter collineations for the combination of two
perfect fluids in General Relativity are investigated. We study the existence
of timelike and spacelike conformal Ricci and matter collineations by
introducing the kinematical and dynamical properties of such fluids and using
the Einstein f... | [
{
"created": "Fri, 27 Feb 2009 03:04:57 GMT",
"version": "v1"
}
] | 2009-05-16 | [
[
"Sharif",
"M.",
""
],
[
"Tehseen",
"Naghmana",
""
]
] | Conformal Ricci and conformal matter collineations for the combination of two perfect fluids in General Relativity are investigated. We study the existence of timelike and spacelike conformal Ricci and matter collineations by introducing the kinematical and dynamical properties of such fluids and using the Einstein fie... |
1602.03018 | Philippe G. LeFloch | Ellery Ames, Florian Beyer, James Isenberg, and Philippe G. LeFloch | A class of solutions to the Einstein equations with AVTD behavior in
generalized wave gauges | 39 pages | Journal of Geometry and Physics 121 (2017) 42-71 | 10.1016/j.geomphys.2017.06.005 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the existence of smooth vacuum Gowdy solutions, which are
asymptotically velocity term dominated (AVTD) and have T3-spatial topology, in
an infinite dimensional family of generalized wave gauges. These results show
that the AVTD property, which is known to hold for solutions in areal
coordinates, is stab... | [
{
"created": "Tue, 9 Feb 2016 15:08:50 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Dec 2016 17:46:06 GMT",
"version": "v2"
}
] | 2017-12-11 | [
[
"Ames",
"Ellery",
""
],
[
"Beyer",
"Florian",
""
],
[
"Isenberg",
"James",
""
],
[
"LeFloch",
"Philippe G.",
""
]
] | We establish the existence of smooth vacuum Gowdy solutions, which are asymptotically velocity term dominated (AVTD) and have T3-spatial topology, in an infinite dimensional family of generalized wave gauges. These results show that the AVTD property, which is known to hold for solutions in areal coordinates, is stable... |
1303.2899 | Olivier Sarbach | Olivier Sarbach and Thomas Zannias | Relativistic Kinetic Theory: An Introduction | Prepared for the proceedings of the IX Mexican School of the
Gravitation and Mathematical Physics Division of the Mexican Physical
Society, 30 pages, 1 figure | AIP Conf.Proc. 1548 (2013) 134-155 | 10.1063/1.4817035 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a brief introduction to the relativistic kinetic theory of gases
with emphasis on the underlying geometric and Hamiltonian structure of the
theory. Our formalism starts with a discussion on the tangent bundle of a
Lorentzian manifold of arbitrary dimension. Next, we introduce the Poincare
one-form on this ... | [
{
"created": "Tue, 12 Mar 2013 14:40:56 GMT",
"version": "v1"
}
] | 2014-06-17 | [
[
"Sarbach",
"Olivier",
""
],
[
"Zannias",
"Thomas",
""
]
] | We present a brief introduction to the relativistic kinetic theory of gases with emphasis on the underlying geometric and Hamiltonian structure of the theory. Our formalism starts with a discussion on the tangent bundle of a Lorentzian manifold of arbitrary dimension. Next, we introduce the Poincare one-form on this bu... |
gr-qc/0603011 | Thomas Marlow | Thomas Marlow | Bayesian Probabilities and the Histories Algebra | 10 pages, accepted by Int. J. Theo. Phys. Feb 2006 | Int.J.Theor.Phys.45:1247-1257,2006 | 10.1007/s10773-006-9122-3 | null | gr-qc | null | We attempt a justification of a generalisation of the consistent histories
programme using a notion of probability that is valid for all complete sets of
history propositions. This consists of introducing Cox's axioms of probability
theory and showing that our candidate notion of probability obeys them. We also
give ... | [
{
"created": "Mon, 6 Mar 2006 15:15:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Marlow",
"Thomas",
""
]
] | We attempt a justification of a generalisation of the consistent histories programme using a notion of probability that is valid for all complete sets of history propositions. This consists of introducing Cox's axioms of probability theory and showing that our candidate notion of probability obeys them. We also give a ... |
1603.02848 | Daniele Malafarina | Daniele Malafarina, Pankaj S. Joshi | Electromagnetic counterparts to gravitational waves from black hole
mergers and naked singularities | 5 pages, 2 figures | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the question here whether the proposed electromagnetic
counterpart of the gravitational wave signals in binary black hole coalescence
may be due to the appearance of a `short lived' naked singularity during the
merger. We point out that the change in topology that the spacetime undergoes
during the merger... | [
{
"created": "Wed, 9 Mar 2016 11:27:44 GMT",
"version": "v1"
}
] | 2016-03-10 | [
[
"Malafarina",
"Daniele",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We consider the question here whether the proposed electromagnetic counterpart of the gravitational wave signals in binary black hole coalescence may be due to the appearance of a `short lived' naked singularity during the merger. We point out that the change in topology that the spacetime undergoes during the merger c... |
1804.05693 | Chandra Prakash Singh | C P Singh and Milan Srivastava | Evolution and thermodynamics of new holographic dark energy with bulk
viscosity in modified $f(R, T)$ gravity | 29 pages, 13 figures. arXiv admin note: text overlap with
arXiv:1406.2089, arXiv:1612.00345, arXiv:1501.04047, arXiv:1002.3605,
arXiv:0905.0527 by other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, bulk viscosity is introduced in new holographic dark energy
(HDE) to describe the effects of cosmic non-perfect fluid on the evolution of
the universe in modified $f(R,T)$ gravity. Assuming $f(R,T)=R+\lambda T$, where
$R$ is the Ricci scalar, $T$, the trace of energy-momentum tensor and $\lambda$
is a ... | [
{
"created": "Fri, 13 Apr 2018 15:18:51 GMT",
"version": "v1"
}
] | 2018-04-17 | [
[
"Singh",
"C P",
""
],
[
"Srivastava",
"Milan",
""
]
] | In this paper, bulk viscosity is introduced in new holographic dark energy (HDE) to describe the effects of cosmic non-perfect fluid on the evolution of the universe in modified $f(R,T)$ gravity. Assuming $f(R,T)=R+\lambda T$, where $R$ is the Ricci scalar, $T$, the trace of energy-momentum tensor and $\lambda$ is a co... |
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