Publication date: Dec 2007
Abstract:
In the framework of the brany models, rotating black holes are described
by the Kerr metric with a tidal charge representing the influence of the
shear effects of the bulk space Weyl tensor onto the black hole
spacetime. Here we study the influence of the tidal charge onto some
optical phenomena in rotating black hole spacetimes. The photon motion
is given in terms of constants of the geodetical motion related to the
spacetime symmetries and escape photon cones are given for special
families of locally non-rotating, circular geodetical and radially
freely-falling observers. The shadow of a rotating black hole and the
shape of an equatorial thin accretion disk are given and classified in
terms of the black hole rotational and tidal parameters.
Authors:
Schee, Jan; Stuchlík, Zdeněk;