| Issue |
EPL
Volume 120, Number 5, December 2017
|
|
|---|---|---|
| Article Number | 50003 | |
| Number of page(s) | 4 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/120/50003 | |
| Published online | 22 February 2018 | |
Study of superradiant instability of a dilaton-axion black hole under scalar perturbation
Department of Physics, Ranaghat College - District-Nadia, Pin-741201, India and Department of Theoretical Physics, Indian Association for the Cultivation of Science - Jadavpur, Kolkata-700 032, India
(a) tanwi.ghosh@yahoo.co.in
(b) tpssg@iacs.res.in
Received: 18 December 2017
Accepted: 1 February 2018
We study the superradiant instability of dilaton-axion black holes. For such black holes we examine whether there exists any potential barrier outside the event horizon that can kill the superradiant modes. Our result exhibits that the dilaton-axion couplings do not lead to any superradiant instability under scalar perturbation. This establishes the robustness of superradiant stability for a much wider class of black holes.
PACS: 04.70.Bw – Classical black holes / 04.70.Dy – Quantum aspects of black holes, evaporation, thermodynamics
© EPLA, 2018
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