Accretion disks in the Kerr-de Sitter spacetimes

Details Accretion disks in the Kerr-de Sitter spacetimes Accretion disks in the Kerr-de Sitter spacetimes

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ragt.meet..205s&link_type=abstract

In Proceedings of RAGtime 4/5 Workshops on black holes and neutron stars, 14-16/13-15 October 2002/2003, Eds: S. Hledík and Z. S

Mathematics

Logic

2

Accretion, Accretion Disks, Black-Hole Physics, Relativity, Cosmological Constant, Galaxies, Jets, Radii

Scientific paper

We consider basic properties of both the geometrically thin and thick accretion disks in the Kerr-de Sitter black-hole and naked-singularity spacetimes. The properties are determined by character of the equatorial circular geodesics of these spacetimes and by the equilibrium configurations of a perfect fluid rotating around their symmetry axis. Transformation of a Kerr-de Sitter naked singularity into an extreme black hole due to accretion in the thin disks is briefly discussed for both the plus-family and minus-family disks. It is shown that such a conversion leads to an abrupt instability of the innermost parts of the plus-family accretion disks that can have strong observational consequences.

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