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Superradiant scattering by rotating black-bounce black holes

Pedro Henrique Croti Siqueira1,2,* and Maurício Richartz1,†

  • *Contact author: pedro.croti@ufabc.edu.br
  • †Contact author: mauricio.richartz@ufabc.edu.br
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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 M and specific angular momentum a through a regularization parameter p and two deformation exponents (k,n). Focusing on massless (ℓ,m)=(1,1) 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 (a/M,p/M) parameter space for several combinations of k and n. We find that increasing n systematically enhances superradiance, whereas increasing k 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.

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Phys. Rev. D 114, 084092– Published 28 October, 2026
  • Received 8 January 2026
  • Accepted 9 October 2026
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