Publication date: Jan 2009
Abstract:
We study the influence of the tidal charge parameter of the braneworld
models on some optical phenomena in rotating black hole space-times. The
escape photon cones are determined for special families of locally
nonrotating, circular geodetical and radially free-falling observers.
The silhouette of a rotating black hole, the shape of an equatorial thin
accretion disk and the time delay effect for direct and indirect images
of a radiating hot spot orbiting the black hole are given and classified
in terms of the black hole rotational and tidal parameters. It is shown
that increase of the negatively valued tidal parameter, with the
rotational parameter fixed, generally strengthens the relativistic
effects and suppresses the rotation-induced asymmetries in the optical
phenomena.
Authors:
Schee, Jan; Stuchlík, Zdeněk;