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    Dynamics of current-carrying string loops in the Kerr naked-singularity and black-hole spacetimes

    Zdeněk Stuchlík · 01 září, 2013 · Fyzika · 0 comments
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    Publication date: Sep 2013

    Abstract:
    Current-carrying string-loop dynamics is studied in the Kerr spacetimes.
    With attention concentrated to the axisymmetric motion of string loops
    around the symmetry axis of both black-hole (BH) and naked singularity
    (NS) spacetimes, it is shown that the resulting motion is governed by
    the presence of an outer tension barrier and an inner angular momentum
    barrier that are influenced by the BH or NS spin. We classify the string
    dynamics according to properties of the energy boundary function
    (effective potential) for the string loop motion. We have found that for
    NS there exist new types of energy boundary function, namely those with
    off-equatorial minima. Conversion of the energy of the string
    oscillations to the energy of the linear translational motion has been
    studied. Such a transmutation effect is much more efficient in the NS
    spacetimes because of lack of the event horizon. For BH spacetimes
    efficiency of the transmutation effect is only weakly spin dependent.
    Transition from the regular to chaotic regime of the string-loop
    dynamics is examined and used for explanation of the string-loop motion
    focusing problem. Radial and vertical frequencies of small oscillations
    of string loops near minima of the effective potential in the equatorial
    plane are given. These can be related to high-frequency quasiperiodic
    oscillations observed near black holes.

    Authors:
    Kološ, M.; Stuchlík, Z.;

    http://adsabs.harvard.edu/abs/2013PhRvD..88f5004K

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