Electrically charged black holes in linear and nonlinear electrodynamics: Geodesic analysis and scalar absorption

Abstract

Along the last decades, several regular black hole (BH) solutions, i.e., singularity-free BHs, have been proposed and associated to nonlinear electrodynamics models minimally coupled to general relativity. Within this context, it is of interest to study how those nonlinear-electrodynamic-based regular BHs (RBHs) would interact with their astrophysical environment. We investigate the propagation of a massless test scalar field in the background of an electrically charged RBH solution, obtained by Eloy Ayón-Beato and Alberto García. Using a numerical approach, we compute the absorption cross section of the massless scalar field for arbitrary values of the frequency of the incident wave. We compare the absorption cross sections of the Ayón-Beato and García RBH with the Reissner-Nordström BH, showing that they can be very similar in the whole frequency regime.

10 pages, 15 figures, published in Physical Review D

References in corpus (8)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• The Confrontation between General Relativity and Experiment
• Regular black holes with a nonlinear electrodynamics source
• Spherical black holes with regular center: a review of existing models including a recent realization with Gaussian sources
• Black hole as a magnetic monopole within exponential nonlinear electrodynamics
• Absorption of planar massless scalar waves by Bardeen regular black holes
• Inferring black hole charge from backscattered electromagnetic radiation
• Scalar absorption by charged rotating black holes