Quasinormal modes and Hawking radiation of a charged Weyl black hole

Abstract

We investigate the scalar field system over a charged Weyl black hole, depicted by a parameter $\lambda$. It is found that the imaginary part of the quasinormal mode spectra is always negative and the perturbation does not increase with the time, indicating that the system is stable under scalar field perturbation. Furthermore, the quasinormal mode spectra and Hawking radiation exhibit a qualitatively similar characteristic in that they both rise with rising $\lambda$ and approach a constant when $\lambda$ is large enough. Especially, we would like to emphasize that an exponential decay obviously emerges in the phase of the ringing tail as $\lambda$ increases. It indicates that the characteristic parameter $\lambda$ has an obvious imprint on the ringing tail, which is expected to be detected by future observations.