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

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

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

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