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

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Dynamics of thick discs around Schwarzschild-de Sitter black holes

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dc.contributor.author Rezzolla, L.
dc.contributor.author Zanotti, O.
dc.contributor.author Font Roda, José Antonio
dc.date.accessioned 2010-07-13T08:11:52Z
dc.date.available 2010-07-13T08:11:52Z
dc.date.issued 2003
dc.identifier.uri http://hdl.handle.net/10550/15998
dc.description.abstract 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. en
dc.language.iso en en
dc.relation http://www.aanda.org/articles/aa/pdf/2003/49/aah4705.pdf en
dc.source REZZOLLA, L. ; Zanotti, O. ; Font Roda, Jose Antonio, 2003, Dynamics of thick discs around Schwarzschild-de Sitter black holes, Astronomy and Astrophysics, vol. 412, no. 3, p. 603-613 en
dc.subject Accretion discs ; Black holes ; Relativity ; Hydrodynamics ; Cosmological constant en
dc.title Dynamics of thick discs around Schwarzschild-de Sitter black holes en
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia en
dc.identifier.doi 10.1051/0004-6361:20031457 en
dc.description.private Font Roda, Jose Antonio, J.Antonio.Font@uv.es en
dc.identifier.idgrec 004343 en

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