Speaker
Supakchai Ponglertsakul
Description
A charged scalar field can be used to extract energy from a charged black hole via superradiant scattering. A mirror-like or AdS boundary could lead the system to an instability. This is because the scalar fields are trapped outside the black hole and repeatedly amplified, there-fore ultimately the back-reaction on the black hole background will become non-negligible.
A charged scalar field on the Reissner-Nordström background with a mirror has been shown to possess a superradiant instability [1]. However the possible end-point of this superradiant instability remains unknown. In this talk, I will consider a fully coupled system consisting of gravity, an electric field and a charged scalar field with a mirror. By solving the field equations, numerical solutions representing charged hairy black holes are obtained. Then I will comment on the stability of these solutions. More details of this work are to appear in
Ref. [2].
References
[1] Juan Carlos Degollado, Carlos A. R. Herdeiro, and Helgi Freyr R ´unarsson. Rapid
growth of superradiant instabilities for charged black holes in a cavity. Phys.Rev.,
D88:063003, 2013.
[2] Sam Dolan, Supakchai Ponglertsakul, and Elizabeth Winstanley. Article in preparation.
Author
Co-authors
Prof.
Elizabeth Winstanley
(Consortium for Fundamental Physics, School of Mathematics and Statistics, University of Sheffield)
Dr
Sam Dolan
(Consortium for Fundamental Physics, School of Mathematics and Statistics, University of Sheffield)
