MG15 - Talk detail

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Abstract

Distorted black holes are local solutions describing the near-horizon region of a black hole, which interacts quasi-stationary with an external gravitational source. They can model astrophysical scenarios such as a black hole surrounded by an accretion disk, or a black hole in a binary system in the very initial stages of the inspiral. In this talk we discuss the influence of the external matter on the light propagation in the black hole spacetime. In particular we consider the local shadow cast by the Schwarzschild black hole with a quadrupole distortion, and show that the external matter sources lead to the appearance of multiple shadow images. The dynamical mechanism for the multiple shadow formation is explained, as well as the conditions for its realization. The appearance of multiple shadows proves to be a qualitative feature of the distorted black hole spacetimes, caused by the mere presence of an external gravitational source, and not by its strength.

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