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We consider an electric charge, minimally coupled to the Maxwell field,rotating around a Schwarzschild black hole. We investigate how much of theradiation emitted from the swirling charge is absorbed by the black hole andshow that most of the photons escape to infinity. For this purpose we use theGupta-Bleuler quantization of the electromagnetic field in the modified Feynmangauge developed in the context of quantum field theory in Schwarzschildspacetime. We obtain that the two photon polarizations contribute quitedifferently to the emitted power. In addition, we discuss the accurateness ofthe results obtained in a full general relativistic approach in comparison withthe ones obtained when the electric charge is assumed to be orbiting a massiveobject due to a Newtonian force.Comment: 8 pages (revtex), 8 figure

Semiclassical approach to black hole absorption of electromagnetic radiation emitted by a rotating charge