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    Light escape cones in local reference frames of Kerr-de Sitter black hole spacetimes and related black hole shadows

    Zdeněk Stuchlík · Březen 01, 2018 · Fyzika · 0 comments
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    Publication date: Mar 2018

    Abstract:
    We construct the light escape cones of isotropic spot sources of
    radiation residing in special classes of reference frames in the Kerr-de
    Sitter (KdS) black hole spacetimes, namely in the fundamental class of
    `non-geodesic‘ locally non-rotating reference frames (LNRFs), and two
    classes of `geodesic‘ frames, the radial geodesic frames (RGFs), both
    falling and escaping, and the frames related to the circular geodesic
    orbits (CGFs). We compare the cones constructed in a given position for
    the LNRFs, RGFs, and CGFs. We have shown that the photons locally
    counter-rotating relative to LNRFs with positive impact parameter and
    negative covariant energy are confined to the ergosphere region.
    Finally, we demonstrate that the light escaping cones govern the shadows
    of black holes located in front of a radiating screen, as seen by the
    observers in the considered frames. For shadows related to distant
    static observers the LNRFs are relevant.

    Authors:
    Stuchlík, Zdeněk; Charbulák, Daniel; Schee, Jan;

    https://ui.adsabs.harvard.edu/abs/2018EPJC…78..180S

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