Dynamics of scalar fields in the background of rotating black holes. II. A note on superradiance
Andersson, Nils, Laguna, Pablo and Papadopoulos, Philippos (1998) Dynamics of scalar fields in the background of rotating black holes. II. A note on superradiance. Physical Review D, 58, (8), 1-4. (doi:10.1103/PhysRevD.58.087503).
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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.
|Digital Object Identifier (DOI):||doi:10.1103/PhysRevD.58.087503|
|Subjects:||Q Science > QB Astronomy
Q Science > QC Physics
|Divisions:||University Structure - Pre August 2011 > School of Mathematics > Applied Mathematics
|Date Deposited:||13 Mar 2007|
|Last Modified:||06 Aug 2015 02:29|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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