Accretion onto almost Kerr-de Sitter black holes

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Written by Filip Ficek

The Reissner–Nordström solution resembles certain features characteristic for the Kerr solution - specifically they share the causal and horizon structures. This fact lets us suspect, that considering an accretion onto spherically symmetric charged black holes may give us an insight into an accretion onto less symmetric rotating black holes. During my speech I want to focus on the Bondi-type accretion in the Reissner-Nordström-(anti-)de Sitter spacetime. I will consider an accretion of the isothermal and polytropic test fluids, and show that in some specific cases one can obtain the analytic solutions. I will also give some remarks about the existing homoclinic solutions. Finally I will show the dependence between positions of the horizons and the photon gas sonic points.