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    The fall of the shell of dust on to a rotating black hole.

    Zdeněk Stuchlík · Květen 01, 1976 · Fyzika · 0 comments
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    Publication date: May 1976

    Abstract:
    The motion of particles falling radially from rest at infinity with zero
    total angular momentum on to a rotating (Kerr) black hole is studied.
    The shell of such particles, initially spherical, becomes prolate along
    the axis of symmetry during the fall onto a rotating hole. The shape of
    the shell from the viewpoint of distant observers is studied by means of
    the photons moving along the (non-shearing) geodesics of the outgoing
    principal null congruence. The approach of the particles towards the
    horizon in terms of the arrival times of these photons to a distant
    observer, the redshift of the radiation and its intensity show
    dependence exponentially on the observer’s proper time as in the non-
    rotating case, however the characteristic e-folding times become
    infinite as the hole’s angular momentum approaches the extreme value. In
    the case of an extreme Kerr black hole these exponential laws go over
    into power laws.

    Authors:
    Bicak, J.; Stuchlik, Z.;

    https://ui.adsabs.harvard.edu/abs/1976MNRAS.175..381B

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