Radiating KerrNewman black hole in f( R) gravity
Abstract
We derive an exact radiating KerrNewman like black hole solution, with constant curvature R= R _{0} imposed, to metric f( R) gravity via complex transformations suggested by NewmanJanis. This generates a geometry which is precisely that of radiating KerrNewmande Sitter/antide Sitter with the f( R) gravity term R _{0} contributing a cosmologicallike term. The structure of three horizonlike surfaces, viz. timelike limit surface, apparent horizon, and event horizon, are determined. We demonstrate the existence of an additional cosmological horizon, in f( R) gravity model, apart from the regular black hole horizons that exist in the analogous general relativity case. In particular, the known stationary KerrNewman black hole solutions of f( R) gravity and general relativity are retrieved. We find that the timelike limit surface becomes less prolate with R _{0} thereby affecting the shape of the corresponding ergosphere.
 Publication:

European Physical Journal C
 Pub Date:
 June 2013
 DOI:
 10.1140/epjc/s100520132473z
 arXiv:
 arXiv:1208.3028
 Bibcode:
 2013EPJC...73.2473G
 Keywords:

 General Relativity and Quantum Cosmology
 EPrint:
 11 pages, 6 figures, new text and reference added