Massive and charged scalar field in Kerr-Newman spacetime: Absorption and superradiance

Abstract

We consider the propagation of a generic scalar field around a rotating and charged black hole. Using the partial wave method, we find, numerically, the total and partial absorption cross sections for different incidence angles. We investigate the low- and high-frequency limits, finding semi-analytical approximations for the absorption cross section, which we compare with our numerical results. Finally, we consider the superradiant regime, showing that, for charged fields, planar waves can be superradiantly scattered.

8 pages, 7 figures

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• 4D Einstein-Gauss-Bonnet gravity: Massless particles and absorption of planar spin-0 waves
• Extraction of energy from a black hole in Einstein-Maxwell-scalar theory
• Scattering by stringy black holes
• The generalized second law for fermionic and bosonic fields
• The Gravity of Classical Fields: And Its Effect on the Dynamics of Gravitational Systems