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

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

1998-02-23

arxiv.org/abs/gr-qc/9802059v1

Phys.Rev.D58:087503,1998

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, 3 Postscript figures, Submitted Phys. Rev. D

Scientific paper

10.1103/PhysRevD.58.087503

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.

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