2006
Basic Properties of Toroidal Structures in Kerr-de Sitter Backgrounds
SLANÝ, Petr and Zdeněk STUCHLÍKBasic information
Original name
Basic Properties of Toroidal Structures in Kerr-de Sitter Backgrounds
Authors
Edition
United States of America, Albert Einstein Century International Conference, p. "A32", 1 pp. 2006
Publisher
American Institute of Physics
Other information
Language
English
Type of outcome
Proceedings paper
Field of Study
10308 Astronomy
Confidentiality degree
is not subject to a state or trade secret
Organization unit
Faculty of Philosophy and Science in Opava
ISBN
978-0-7354-0359-8
EID Scopus
2-s2.0-77956666520
Keywords in English
cosmological constant, black holes, naked singularities, toroidal structures
Tags
International impact
Links
MSM4781305903, plan (intention).
Changed: 18/12/2020 11:15, Mgr. Pavlína Jalůvková
Abstract
In the original language
Perfect fluid tori with uniform distribution of the specific angular momentum orbiting the Kerr-de Sitter black holes or naked singularities are studied. Closed equipotential surfaces corresponding to stationary toroidal discs are allowed only in the spacetimes admitting stable circular geodesics. The last closed surface crosses itself in the cusp(s) enabling outflow(s) of matter from the torus due to the violation of hydrostatic equilibrium. The repulsive cosmological constant implies the existence ofthe outer cusp (with a stabilizing effect on the tori because of excretion, i.e., outflow of matter from the torus into the outer space) and the strong collimation of open equipotential surfaces along the rotational axis. Both the effects take place nearby so-called static radius where the gravitational attraction is just balanced by the cosmic repulsion.