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Observability of spherical photon orbits in near-extremal Kerr black holes (1904.00271v2)
Published 30 Mar 2019 in gr-qc, astro-ph.HE, and hep-th
Abstract: We investigate the spherical photon orbits in near-extremal Kerr spacetimes. We show that the spherical photon orbits with impact parameters in a finite range converge on the event horizon. Furthermore, we demonstrate that the Weyl curvature near the horizon does not generate the shear of a congruence of such light rays. Because of this property, a series of images produced by the light orbiting around a near-extremal Kerr black hole several times can be observable.
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