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    Current-carrying string loops in black-hole spacetimes with a repulsive cosmological constant

    Zdeněk Stuchlík · Prosinec 01, 2010 · Fyzika · 0 comments
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    Publication date: Dec 2010

    Abstract:
    Current-carrying string loop dynamics in Schwarzschild-de Sitter
    spacetimes characterized by the cosmological parameter
    λ=(1)/(3)ΛM2 is investigated. With attention concentrated to
    the axisymmetric motion of string loops 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 black hole
    gravitational field given by the mass M and the cosmic repulsion given
    by the cosmological constant Λ. The gravitational attraction could cause
    capturing of the string having low energy by the black hole or trapping
    in its vicinity; with high enough energy, the string can escape
    (scatter) to infinity. The role of the cosmic repulsion becomes
    important in vicinity of the so-called static radius where the
    gravitational attraction is balanced by the cosmic repulsion—it is
    demonstrated both in terms of the effective potential of the string
    motion and the basin boundary method reflecting its chaotic character,
    that a potential barrier exists along the static radius behind which no
    trapped oscillations may exist. The trapped states of the string loops,
    governed by the interplay of the gravitating mass M and the cosmic
    repulsion, are allowed only in Schwarzschild-de Sitter spacetimes with
    the cosmological parameter λ<λtrap̃0.00497. The trapped
    oscillations can extend close to the radius of photon circular orbit,
    down to rmt̃3.3M.

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

    https://ui.adsabs.harvard.edu/abs/2010PhRvD..82l5012K

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