Gravitationally induced electromagnetic radiation

A fully relativistic treatment is given to analyze the electromagnetic radiation induced by gravitational perturbations in extreme relativistic regions. For the sake of clarity, results are presented here for the simplest possible example: an uncharged mass $m$ falling radially into a field of a Reissner-Nordstr\o{}m solution. Explicit results governing the energetics of the process are found. The amount of electromagnetic radiation radiated can be of the order of magnitude of the gravitational one.