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    Toroidal configurations of perfect fluid in the Reissner-Nordström-(anti-)de Sitter spacetimes

    Zdeněk Stuchlík · 01 ledna, 2011 · Fyzika · 0 comments
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    Publication date: Jan 2011

    Abstract:
    Influence of cosmological constant on toroidal fluid configurations around charged spherically symmetric black holes and naked singularities is demostrated by study of perfect-fluid tori with uniform distribution of specific angular momentum orbiting in the Reissner-Nordström-(anti-)de Sitter spacetimes. Toroidal configurations are allowed only in the spacetimes admitting existence of stable circular geodesics. Configurations with marginally closed equipotential (equipressure) surfaces crossing itself in a cusp allow accretion (through the inner cusp) and/or excretion (through the outer cusp) of matter from the toroidal configuration. Detailed classification of the Reissner-Nordström-(anti-)de Sitter spacetimes according to properties of the marginally stable tori is given. It is demonstrated that in the Reissner-Nordström-de Sitter naked-singularity spacetimes an interesting phenomenon of doubled tori can exist enabling exchange of matter between two tori in both inward and outward directions. In naked-singularity spacetimes the accretion onto the central singularity is impossible due to existence of a potential barrier.

    Authors:
    Kucáková, Hana; Slaný, Petr; Stuchlík, Zdenĕk;

    https://ui.adsabs.harvard.edu/abs/2011JCAP…01..033K

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