Dynamics of thick discs around Schwarzschild-de Sitter black holes

Details Dynamics of thick discs around Schwarzschild-de Sitter black holes Dynamics of thick discs around Schwarzschild-de Sitter black holes

2003-10-07

arxiv.org/abs/gr-qc/0310045v1

Astron.Astrophys. 412 (2003) 603

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages; A&A, in press

Scientific paper

10.1051/0004-6361:20031457

We consider the effects of a cosmological constant on the dynamics of constant angular momentum discs orbiting Schwarzschild-de Sitter black holes. The motivation behind this study is to investigate whether the presence of a radial force contrasting the black hole's gravitational attraction can influence the occurrence of the runaway instability, a robust feature of the dynamics of constant angular momentum tori in Schwarzschild and Kerr spacetimes. In addition to the inner cusp near the black hole horizon through which matter can accrete onto the black hole, in fact, a positive cosmological constant introduces also an outer cusp through which matter can leave the torus without accreting onto the black hole. To assess the impact of this outflow on the development of the instability we have performed time-dependent and axisymmetric hydrodynamical simulations of equilibrium initial configurations in a sequence of background spacetimes of Schwarzschild-de Sitter black holes with increasing masses. The simulations have been performed with an unrealistic value for the cosmological constant which, however, yields sufficiently small discs to be resolved accurately on numerical grids and thus provides a first qualitative picture of the dynamics. The calculations, carried out for a wide range of initial conditions, show that the mass-loss from the outer cusp can have a considerable impact on the instability, with the latter being rapidly suppressed if the outflow is large enough.

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