2014/03/31 by Ran Li, Junkun Zhao · 2 citations
Physics and Astronomy · #Angular momentum #Astrophysical Phenomena and Observations #Black Holes and Theoretical Physics #Black hole (networking) #Charged black hole #Classical mechanics #Entropy (arrow of time) #Event (particle physics) #Event horizon #Extremal black hole #Geometry #Instability #Massless particle #Physics #Pulsars and Gravitational Waves Research #Quantum electrodynamics #Quantum mechanics #Rotating black hole #Scalar (mathematics) #Scalar field #Superradiance #gr-qc
paper · pdf · doi:10.1140/epjc/s10052-014-3051-8
published as Eur. Phys. J. C (2014) 74:3051 · 5 pages, no figure, published version
openalex publication_date 2014/09/01 · arxiv created 2014/12/04 · arxiv updated 2014/12/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
It has been shown that the mass of a charged scalar field in the background of a charged stringy black hole is never able to generate a potential well outside the event horizon to trap the superradiant modes. This is to say that the charged stringy black hole is stable against massive charged scalar perturbations. In this paper we will study the superradiant instability of the massless scalar field in the background of charged stringy black hole due to a mirror-like boundary condition. The analytical expression of the frequencies of unstable superradiant modes is derived by using the asymptotic matching method. It is also pointed out that the black hole mirror system becomes extremely unstable for a large charge q of the scalar field and a small mirror radius rm .