Superradiant amplification of charged scalar fields around rotating charged de Sitter black holes is suppressed in conformal Weyl gravity relative to general relativity, with strong exponential suppression for massive fields in the cosmological region.
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For a rotating black hole in a Dehnen dark matter halo, the scalar quasibound spectrum is the Kerr hydrogenic spectrum with a halo-shifted effective mass, and the superradiant window narrows through a halo-modified horizon quantity.
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Superradiant Suppression of Non-minimally Coupled Scalar fields for a Rotating Charged dS Black Hole in Conformal Weyl Gravity
Superradiant amplification of charged scalar fields around rotating charged de Sitter black holes is suppressed in conformal Weyl gravity relative to general relativity, with strong exponential suppression for massive fields in the cosmological region.
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Tuning A Rotating Black Hole Spectrum with Dark Matter Halo: Quasibound States, Scalar Cloud, Black Hole Bomb and Superradiant Scattering
For a rotating black hole in a Dehnen dark matter halo, the scalar quasibound spectrum is the Kerr hydrogenic spectrum with a halo-shifted effective mass, and the superradiant window narrows through a halo-modified horizon quantity.