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    Efficiency of the Keplerian accretion in braneworld Kerr-Newman spacetimes and mining instability of some naked singularity spacetimes

    Zdeněk Stuchlík · Říjen 01, 2016 · Fyzika · 0 comments
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    Publication date: Oct 2016

    Abstract:
    We show that the braneworld rotating Kerr-Newman black hole and naked
    singularity spacetimes with both positive and negative braneworld tidal
    charge parameters can be separated into 14 classes according to the
    properties of circular geodesics governing the Keplerian accretion. We
    determine the efficiency of the Keplerian accretion disks for all
    braneworld Kerr-Newman spacetimes. We demonstrate the occurrence of an
    infinitely deep gravitational potential in Kerr-Newman naked singularity
    spacetimes having the braneworld dimensionless tidal charge b ∈(1
    /4 ,1 ) and the dimensionless spin a ∈(2 √{b }-√{b (4 b
    -1 ) } , 2 √{b }+√{b (4 b -1 ) }) , implying unbound
    efficiency of the Keplerian accretion and the possibility of extracting
    the whole naked singularity mass. Therefore, we call them braneworld
    "mining-unstable" Kerr-Newman naked singularity spacetimes. Fundamental
    restriction on the relevance of the extraordinary—but fully
    classical—phenomenon of the mining instability is given by
    validity of the assumption of geodesic motion of the accreting matter.

    Authors:
    Blaschke, Martin; Stuchlík, Zdeněk;

    http://adsabs.harvard.edu/abs/2016PhRvD..94h6006B

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