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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• Superradiance and Stability of Kerr Black Hole Enclosed by Anisotropic Fluid Matter
• Signatures of Ultralight Bosons in Compact Binary Inspiral and Outspiral
• Asymmetric wormholes in Palatini $f(\mathcal{R})$ gravity: Energy conditions, absorption and quasibound states
• 4D Einstein-Gauss-Bonnet gravity: Massless particles and absorption of planar spin-0 waves
• Superradiant Instability of Magnetic Black Holes
• Conditions for superradiant instability of the Kerr-Newman black holes
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• Revisiting superradiant stability of Kerr-Newman black holes under a charged massive scalar
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• Hairy black holes via gravitational decoupling: light rings, absorption and spectral lines
• Superradiant instability in slowly rotating Kerr-Newman black holes
• Sufficient conditions for unbounded superradiance in black hole spacetimes sourced by nonlinear electrodynamics
• Black Hole Superradiance in f(R) Gravities
• Ringing Black Hole is Superradiant: Ultra-light Scalar Field
• The generalized second law for fermionic and bosonic fields
• Charged black holes in de Sitter space: superradiant amplification of charged scalar waves and resonant hyperradiation
• Superradiant scattering of massive scalar field due to magnetically charged rotating black hole
• The Gravity of Classical Fields: And Its Effect on the Dynamics of Gravitational Systems
• On-Axis Tidal Forces in Kerr Spacetime