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Nariai-bertotti-robinson spacetimes as a building material for one-way wormholes with horizons, but without singularity
(2008)
We discuss the problem of wormholes from the viewpoint of gluing together two Reissner - Nordström-type universes while putting between them a segment of the Nariai-type world (in both cases there are also present ...
Worldline formalism for a confined scalar field
(Springer, 2019-08-07)
The worldline formalism is a useful scheme in quantum field theory which has also become a powerful tool for numerical computations. The key ingredient in this formalism is the first quantization of an auxiliary point-particle ...
A note on geodesics in inhomogeneous expanding spacetimes
(IOP Publishing, 2019-03)
There are several solutions of Einstein field equations that describe an inhomogeneity in an expanding universe. Among these solutions, the McVittie metric and its generalizations have been investigated through decades, ...
Dynamical black hole in a bouncing universe
(American Physical Society, 2021-03)
We analyze the causal structure of McVittie spacetime for a classical bouncing cosmological model. In particular, we compute the trapping horizons of the metric and integrate the trajectories of radial null geodesics before, ...
The regular black hole in four dimensional Born-Infeld gravity
(IOP Publishing, 2019-05)
In the context of Born-Infeld gravity theories we report the existence of a regular black hole interior representing a spherically symmetric vacuum solution of the theory. It reduces to the Schwarzschild interior metric ...
Magnetised accretion discs in Kerr spacetimes
(EDP Sciences, 2015-02)
Context. Observational data from X-ray binary systems provide strong evidence of astronomical objects that are too massive and compact to be explained as neutron or hybrid stars. When these systems are in the thermal ...
Cosmological Exact Solutions Set of a Perfect Fluid in an Anisotropic Space-Time in Petrov Type D
(2016-06)
In this document a set of exact solutions is obtained by using the model of a perfect fluid on an homogeneous and anisotropic space-time that belongs to (Local Rotational Symmetry) Petrov’s type D. This solutions represent ...
Cosmological Exact Solutions Set of a Perfect Fluid in an Anisotropic Space-Time in Petrov Type D
(2016-06)
In this document a set of exact solutions is obtained by using the model of a perfect fluid on an homogeneous and anisotropic space-time that belongs to (Local Rotational Symmetry) Petrov’s type D. This solutions represent ...
Test particles in a magnetized conformastatic spacetime
(American Physical Society, 2016)
A class of exact conformastatic solutions of the Einstein-Maxwell field equations is presented in which the gravitational and electromagnetic potentials are completely determined by a harmonic function. We derive the ...
Kerr-Newman solution as a Dirac particle
(Kluwer Academic/plenum Publ, 2004-11-01)
For m(2) < a(2) + q(2), with m, a, and q respectively the source mass, angular momentum per unit mass, and electric charge, the Kerr-Newman (KN) solution of Einstein's equation reduces to a naked singularity of circular ...