Přehled o publikaci

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 locallynon-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.