Ringing Black Hole is Superradiant: Ultra-light Scalar Field

Abstract

Superradiance has been studied quite extensively in the context of static (charged) and rotating black hole spacetime. In this paper, we report for the first time that for a minimally coupled scalar field, the absorption cross-section of a Schwarzschild black hole in its ring down phase can be superradiant. Our present result opens up an intriguing possibility of observing the black hole merging phenomena through other fundamental fields.

arXiv commentA new section has been added on obsevables effects. Also, few typos are corrected and some references have been added. Accepted for publication in Phys. Rev. D

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