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    Acceleration of string loops in the Schwarzschild-de Sitter geometry

    Zdeněk Stuchlík · Březen 01, 2012 · Fyzika · 0 comments
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    Publication date: Mar 2012

    Abstract:
    We study acceleration of current-carrying string loops governed by the
    presence of an outer tension barrier and an inner angular momentum
    barrier in the field of Schwarzschild-de Sitter black holes. We restrict
    attention to the axisymmetric motion of string loops with energy high
    enough, when the string loop can overcome the gravitational attraction
    and escape to infinity. We demonstrate that string loops can be
    scattered near the black hole horizon, and the energy of string
    oscillations can be efficiently converted to the energy of their linear
    motion. Such a transmutation effect can potentially represent
    acceleration of jets in active galactic nuclei and microquasars. We give
    the conditions limiting energy available for conversion onto the jetlike
    motion. Surprisingly, we are able to show that string loops starting
    from rest can be accelerated up to velocities ṽc even in the field of
    Schwarzschild black holes, if their angular momentum parameter is low
    enough. Such loops could serve as an explanation of highly relativistic
    jets observed in some quasars and active galactic nuclei. The cosmic
    repulsion becomes important behind the so-called static radius where it
    accelerates the linear motion of the string loops up to velocity v=c
    that is reached at the cosmic horizon of the Schwarzschild-de Sitter
    spacetimes independently of the angular momentum parameter of the
    strings.

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

    https://ui.adsabs.harvard.edu/abs/2012PhRvD..85f5022S

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