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    Oscillations of electric current-carrying string loop near a Schwarzschild black hole immersed in an asymptotically uniform magnetic field

    Zdeněk Stuchlík · Prosinec 01, 2014 · Fyzika · 0 comments
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    Publication date: Dec 2014

    Abstract:
    We study oscillations of an electric current-carrying and axially-
    symmetric string loop in the vicinity of a Schwarzschild black hole
    embedded in an asymptotically uniform magnetic field. The radial
    profiles of frequencies of small oscillations of the string loop around
    stable equilibrium points are given for the radial and vertical harmonic
    modes that are relevant also in the quasi-periodic stages of the
    oscillations. Their properties in dependence on the uniform magnetic
    field intensity and angular momentum parameters of the string loops are
    determined. We examine the relevance of resonant phenomena of the radial
    and vertical string-loop oscillations at their frequency ratio 3:2. The
    oscillatory frequencies of the string loops are compared with the
    frequencies of high-frequency quasi-periodic oscillations (HF QPOs)
    observed in the microquasars GRS 1915+105, XTE 1550-564, GRO 1655-40
    containing a black hole. We have demonstrated that the influence of the
    uniform magnetic field does not allow us to explain all the observed
    data for non-rotating black holes. Clearly, rotation of the black hole
    is necessary to explain the all the observed frequencies in the
    microquasars by the string loop oscillations.

    Authors:
    Kološ, Martin; Stuchlík, Zdeněk; Tursunov, Arman;

    https://ui.adsabs.harvard.edu/abs/2014bhns.work..159K

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