Absorption of a massive scalar field by a charged black hole
  We calculate the absorption cross section of a massive neutral scalar field impinging upon a Reissner-Nordstr\"om black hole. First, we derive key approximations in the high- and low-frequency regimes. Next, we develop a numerical method to compute the cross section at intermediate frequencies, and present a selection of results. Finally, we draw together our complementary approaches to give a quantitative full-spectrum description of absorption. 
Carolina L. Benone, Ednilton S. de Oliveira, Sam R. Dolan and Lu\'is   C. B. Crispino
gr-qc