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    Perfect fluid tori orbiting Kehagias-Sfetsos naked singularities

    Zdeněk Stuchlík · Září 01, 2015 · Fyzika · 0 comments
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    Publication date: Sep 2015

    Abstract:
    We construct perfect fluid tori in the field of the Kehagias-Sfetsos
    (K-S) naked singularities. These are spherically symmetric vacuum
    solutions of the modified Hořava quantum gravity, characterized by a
    dimensionless parameter ω M^2, combining the gravitational mass
    parameter M of the spacetime with the Hořava parameter ω reflecting the
    role of the quantum corrections. In dependence on the value of ω M^2,
    the K-S naked singularities demonstrate a variety of qualitatively
    different behavior of their circular geodesics that is fully reflected
    in the properties of the toroidal structures, demonstrating clear
    distinction to the properties of the torii in the Schwarzschild
    spacetimes. In all of the K-S naked singularity spacetimes the tori are
    located above an „antigravity“ sphere where matter can stay in a stable
    equilibrium position, which is relevant for the stability of the
    orbiting fluid toroidal accretion structures. The signature of the K-S
    naked singularity is given by the properties of marginally stable tori
    orbiting with the uniform distribution of the specific angular momentum
    of the fluid, l= const. In the K-S naked singularity spacetimes with ω
    M^2 > 0.2811, doubled tori with the same l= const can exist; mass
    transfer between the outer torus and the inner one is possible under
    appropriate conditions, while only outflow to the outer space is allowed
    in complementary conditions. In the K-S spacetimes with ω M^2 <
    0.2811, accretion from cusped perfect fluid tori is not possible due to
    the non-existence of unstable circular geodesics.

    Authors:
    Stuchlík, Z.; Pugliese, D.; Schee, J.; Kučáková, H.;

    https://ui.adsabs.harvard.edu/abs/2015EPJC…75..451S

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