Electromagnetic scattering from a black hole and the glory effect

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Abstract
The scattering of electromagnetic radiation by a black hole is discussed and further results on this problem are presented. It is shown that the backward glory effect is absent in the Schwarzschild field as well as in the Kerr case when plane electromagnetic waves are incident along the axis of symmetry of the field. A cosmological distribution of Kerr black holes could result in the polarization of the cosmic background radiation for which a crude estimate is given.

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