Publication date: Jun 2016
Abstract:
We study optical effects in quintessential Kerr black hole spacetimes
corresponding to the limiting case of the equation-of-state parameter
$omega_{q}=-1/3$ of the quintessence. In dependence on the
dimensionless quintessential field parameter $c$, we determine the black
hole silhouette and the spectral line profiles of Keplerian disks
generated in this special quintessential Kerr geometry, representing an
extension of the general modifications of the Kerr geometry introduced
recently by Ghasemi-Nodehi and Bambi cite{Gha-Bam:2016:EPJC:}. We
demonstrate that due to the influence of the parameter $c$, the
silhouette is almost homogeneously enlarged, and the spectral line
profiles are redshifted with almost conserved shape.
Authors:
Schee, Jan; Stuchlik, Zdenek;