Time domain analysis of superradiant instability for the charged stringy black hole-mirror system

Understand

It has been proved that the charged stringy black holes are stable under the perturbations of massive charged scalar fields.

• However, superradiant instability can be generated by adding the mirror-like boundary condition to the composed system of charged stringy black hole and scalar field.
• The unstable boxed quasinormal modes have been calculated by using both analytical and numerical method.
• In this paper, we further provide a time domain analysis by performing a long time evolution of charged scalar field configuration in the background of the charged stringy black hole with the mirror-like boundary condition imposed.