Superradiance in static black hole spacetimes
Carolina L. Benone, Lu\'is C. B. Crispino
TL;DR
This paper studies how scalar waves interact with charged black holes, revealing conditions under which waves can be amplified through superradiance, with implications for black hole physics.
Contribution
It provides numerical analysis of scalar field absorption in Reissner-Nordström black holes, highlighting superradiant amplification effects across frequency ranges.
Findings
Absorption cross section can be negative, indicating superradiant amplification.
Numerical results match low- and high-frequency theoretical limits.
Superradiance occurs for planar scalar waves in charged black hole backgrounds.
Abstract
We investigate the absorption of a massive and charged scalar field in a Reissner-Nordstr\"om background. We compare our numerical results for the absorption cross section, obtained for arbitrary frequencies, with the low- and high-frequency limits. We find, in particular, that the total absorption cross section can be negative, showing that planar scalar waves can be superradiantly amplified by black holes.
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