
I am studying fundamental aspects of black hole physics: geometry, dynamics, electrodynamics, gravitational waves propagation, and quantum effects. In these studies I often use a new mathematical approach that was developed by me and my collaborators, and that is known as the optical geometry. I am collaborating with colleagues who use supercomputer simulations to model physical processes that occur in matter falling into black holes. Understanding of these processes is neccessary for explanation of the observed properties of quasars and hard Xray emitting sources in our Galaxy.
Recently, several ways of obtaining observational proof of the existence of blackhole horizons have been proposed. I argued, together with JeanPierre Lasota and Wlodek Kluzniak, that such proof is fundamentally impossible: observations can provide arguments, sometimes very strong ones, in favour of the existence of the event horizon, but they cannot prove it. This applies also to future observations, which will trace very accurately the details of the spacetime metric of a body suspected of being a black hole.
=Some of my recent research black hole papers
=Some of my popular black hole articles
=Books and articles on black holes
=Black hole resources on the Web


