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- W3208287988 abstract "We explore superradiance for Alfv'en waves (Alfv'enic superradiance) in anaxisymmetric rotating magnetosphere of a Kerr black hole within the force-freeapproximation. On the equatorial plane of the Kerr spacetime, the Alfv'en waveequation is reduced to a one-dimensional Schr{o}dinger-type equation byseparating variables of the wave function and introducing a tortoise coordinatemapping the inner and outer light surfaces to $-infty$ and $+infty$,respectively, and we investigate a wave scattering problem for Alfv'en waves.An analysis of the asymptotic solutions of the wave equation and theconservation of the Wronskian give the superradiant condition for Alfv'enwaves, and it will be shown that the condition coincides with that for theBlandford-Znajek process. This means that when Alfv'enic superradiance occurs,the Blandford-Znajek process also occurs in the force-free magnetosphere. Then,we evaluate the reflection rate of Alfv'en waves numerically and confirm thatAlfv'enic superradiance is indeed possible in the Kerr spacetime. Moreover, wewill discuss a resonant scattering of Alfv'en waves, which is related to aquasinormal mode of the magnetosphere." @default.
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- W3208287988 date "2021-11-01" @default.
- W3208287988 modified "2023-09-27" @default.
- W3208287988 title "Alfv'enic superradiance for a monopole magnetosphere around a Kerr black hole" @default.
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