Talks at the DAA by Patrik Mach, from the Jagiellonian University (Poland). Place: Seminar of the Departament of Astronomy and Astrophysics, 4th floor of the Research Building, at Burjassot. Date: Tuesday, 18th of February 2020. Time: 12:00
ABSTRACT:
I will report recent results in modeling of self-gravitating perfect-fluid Keplerian tori around black holes. The emphasis will be put on geometric properties of the corresponding spacetimes and their connection with parametric bifurcation occurring in the solution space. I will discuss the nonmonotonicity of the circumferential radius and the breaking of the Pappus-Guldinus rule. If time permits, I should also comment on the occurrence of toroidal ergoregions and the properties of geodesics in the obtained spacetimes.
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