Superradiant scattering by rotating black-bounce black holes
Phys. Rev. D 114, 084092 – Published 28 October, 2026
DOI: https://doi.org/10.1103/s96j-r8vn
Abstract
We investigate superradiant scattering off a rotating regular black hole described by a black-bounce metric which generalizes the Kerr spacetime of mass and specific angular momentum through a regularization parameter and two deformation exponents . Focusing on massless scalar modes, we explore the parameter space and compute amplification factors by numerically integrating the separated radial Klein-Gordon equation. We track the peak amplification and the corresponding frequency across the parameter space for several combinations of and . We find that increasing systematically enhances superradiance, whereas increasing tends to suppress it. In particular, certain configurations can lead to amplification factors that significantly exceed the maximum amplification found for standard Kerr black holes.