Amplification of waves reflected from a rotating "black hole".

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The spectra of gravitational atoms (2019, methodology): “[7, 44]), matching in terms of ξ has the advantage that it is organized solely in powers of α.”
Superradiance: Energy Extraction, Black-Hole Bombs and Implications for Astrophysics and Particle Physics (2015, background): “6) still holds with the substitution [276, 277, 185, 186] ω → (ω −mΩH)ω , (5.”
Static response and Love numbers of Schwarzschild black holes (2020, background): “Interestingly, black holes can support time-dependent scalar profiles with nontrivial boundary conditions [8– 11] as well as superradiant [12–19] clouds; see [20–22] for recent discussions.”
Superradiance (2015, background): “Let A denote the absorption probability at the horizon of a rotating BH (which can be computed analytically in the small frequency regime [351, 352, 353, 244, 245]).”