2015/11/09 by Carolina L. Benone, Luís C. B. Crispino · 1 citation
Physics and Astronomy · #gr-qc
paper · pdf · doi:10.1103/physrevd.93.024028
arxiv created 2015/11/09 · arxiv updated 2016/02/17
We investigate the absorption of a massive and charged scalar field in a Reissner-Nordström background. We compare our numerical results for the absorption cross section, obtained for arbitrary frequencies, with the low- and high-frequency limits. We find, in particular, that the total absorption cross section can be negative, showing that planar scalar waves can be superradiantly amplified by black holes.