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          Institute: MPI für Gravitationsphysik     Collection: Astrophysical Relativity     Display Documents



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ID: 206260.0, MPI für Gravitationsphysik / Astrophysical Relativity
Dynamics of scalar fields in the background of rotating black holes II: A note on superradiance.
Authors:Andersson, Nils; Laguna, Pablo; Papadopoulos, Philippos
Date of Publication (YYYY-MM-DD):1998-10-15
Title of Journal:Physical Review D
Volume:58
Issue / Number:8
Sequence Number of Article:087503
Copyright:Jahrbuch 1999, Copyright MPG 1999
Review Status:not specified
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Bernhard F. Schutz
Affiliations:MPI für Gravitationsphysik/Astrophysical Relativity
Identifiers:LOCALID:arXiv:gr-qc/9802059v1
DOI:10.1103/PhysRevD.58.087503
URL:http://link.aps.org/doi/10.1103/PhysRevD.58.087503
ISSN:0556-2821
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9802059v1.pdf  [133,00 Kb] [Comment:Arxiv]  
 
Phy.Rev.D.58.087503.pdf  [93,00 Kb] [Comment:Online Journal]  
 
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