Classical super-radiance in Kerr-Newman-anti-de Sitter black holes - art. no. 104010

Authors
Citation
E. Winstanley, Classical super-radiance in Kerr-Newman-anti-de Sitter black holes - art. no. 104010, PHYS REV D, 6410(10), 2001, pp. 4010
Citations number
50
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6410
Issue
10
Year of publication
2001
Database
ISI
SICI code
0556-2821(20011115)6410:10<4010:CSIKSB>2.0.ZU;2-#
Abstract
We study in detail the modes of a classical scalar field on a Kerr-Newman-a nti-de Sitter (KN-AdS) black hole. We construct sets of basis modes appropr iate to the two possible boundary conditions ("reflective" and "transparent ") at timelike infinity, and consider whether super-radiance is possible. I f we employ "reflective" boundary conditions, all modes are non-super-radia nt. On the, other hand, for "transparent" boundary conditions, the presence of super-radiance depends on our definition of positive frequency. For tho se KN-AdS black holes having a globally time-like Killing vector, the natur al choice of positive frequency leads to no superradiance. For other KN-AdS black holes, there is a choice of positive frequency which gives no super- radiance, but for other choices there will, in general, be super-radiance.