Dynamics of scalar fields in the background of rotating black holes II: A note 
on superradiance.

Andersson, Nils; Laguna, Pablo; Papadopoulos, Philippos

doi:10.1103/PhysRevD.58.087503

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Dynamics of scalar fields in the background of rotating black holes II: A note on superradiance.

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Papadopoulos, Philippos
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Citation

Andersson, N., Laguna, P., & Papadopoulos, P. (1998). Dynamics of scalar fields in the background of rotating black holes II: A note on superradiance. Physical Review D, 58(8): 087503. doi:10.1103/PhysRevD.58.087503.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-5924-3

Abstract

We analyze the amplification due to so-called superradiance from the scattering of pulses off rotating black holes as a numerical time evolution problem. We consider the “worst possible case” of scalar field pulses for which superradiance effects yield amplifications <1%. We show that this small effect can be isolated by numerically evolving quasi-monochromatic, modulated pulses with a recently developed Teukolsky code. The results show that it is possible to study superradiance in the time domain, but only if the initial data is carefully tuned. This illustrates the intrinsic difficulties of detecting superradiance in more general evolution scenarios.