Publication date: Dec 2001
Abstract:
The influence of a repulsive cosmological constant on accretion
processes onto black holes is discussed. The steady, spherically
symmetric adiabatic inflow and outflow of perfect fluid is considered.
Further, the attention is focused on the properties of both
geometrically thin, Keplerian accretion disks and geometrically thick,
toroidal disks having relevant pressure gradients. It is shown that
nearby the static radius, where the gravitational attraction of a black
hole is just balanced by the cosmological repulsion, the accretion
toroidal disks have an outer cusp enabling outflow of matter from the
disk. Behind the static radius the cosmological repulsion efficiently
collimates jets that emanate along the rotation axis of the toroidal
disk.
Authors:
Stuchlík, Z.;