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    Perfect fluid tori in the Kerr-de Sitter naked singularity backgrounds

    Zdeněk Stuchlík · Prosinec 01, 2005 · Fyzika · 0 comments
    0

    Publication date: Dec 2005

    Abstract:
    Perfect fluid tori with uniform distribution of the specific angular
    momentum, l(r θ)= const, orbiting the Kerr-de Sitter naked singularities
    are discussed. Closed equipotential surfaces corresponding to stationary
    thick discs are allowed only in the spacetimes admitting stable circular
    geodesics. The last closed surface crosses itself in the cusp(s)
    enabling outflows of matter from the torus due to the violation of
    hydrostatic equilibrium. The inner cusp enables the accretion onto the
    ring singularity. Influence of the repulsive cosmological constant, Λ
    > 0, resides in the existence of the outer cusp enabling the
    excretion (outflow of matter from the torus into the outer space) and
    gives rise to completely new type of a disc called the excretion disc.
    The plus-family accretion and excretion discs can be both the corotating
    or counterrotating discs, the minus-family ones are always the
    counterrotating discs, as related to locally non-rotating frames. If the
    parameters of naked-singularity spacetimes are very close to the
    parameters of the extreme black-hole spacetimes, the family of possible
    disc-like configurations includes members with two isolated discs where
    the inner one is always a counterrotating accretion disc, while the
    outer one can be the corotating or counterrotating excretion disc, as
    well as the counterrotating accretion disc.

    Authors:
    Slaný, Petr; Stuchlík, Zdeněk;

    https://ui.adsabs.harvard.edu/abs/2005ragt.meet..167S

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