Scalar radiation emitted from a rotating source around a Reissner-Nordström black hole

Abstract

We investigate the radiation emitted from a scalar source in circular orbit around a Reissner-Nordstr\"om black hole. Particle and energy emission rates are analytically calculated in the low- and high-frequency regimes and shown to be in full agreement with a numerical calculation. A brief comment connecting the present work with a recent discussion on the cosmic censorship conjecture is included at the end.