Superradiance without event horizons in General Relativity
arXiv:1306.3137 · doi:10.1103/PhysRevD.88.044008
Abstract
Superradiant scattering processes are studied in general relativistic systems which, unlike rotating and/or charged black holes, do not exhibit an event horizon. Inspired by Zel'dovich's seminal works on the amplification of waves by a rotating cylinder, we analyse, in the context of General Relativity, the possibility of superradiance for electromagnetic waves reflecting off a rotating star and for charged scalar perturbations impinging on a charged sphere. The role of energy dissipation in these systems is analysed and compared with the role of the event horizon in black hole superradiance.
5 pages; typos corrected; revised assumptions and revised argument in section II, results unchanged
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