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We study scalar test-field perturbations on top of a Kerr--black-bouncebackground, i.e. a family of rotating regular black holes and/or rotatingtraversable wormholes that can mimic Kerr black holes. We compute thequasi-normal modes for a massless field in both the regular black holes andwormhole branches, confirming the stability of the former and identifying a setof growing modes that renders the latter unstable. We further compute thesuperradiance amplification factors, for massless and massive fields, in theregular black hole branch, confirming that these objects superradiate, thoughto a lesser degree than the corresponding Kerr black holes.

Scalar perturbations around rotating regular black holes and wormholes: quasi-normal modes, ergoregion instability and superradiance