Echoes of charged black-bounce spacetimes

Abstract

In present work, the evolution of scalar field and electromagnetic field under the background of the charged black-bounce spacetimes are investigated, and we obtain an obvious echoes signal which appropriately reports the properties of the charged black-bounce spacetimes and disclose the physical reasons behind such phenomena. Furthermore, by studying the quasinormal ringdown, we analyze the three states of the charged black-bounce spacetimes in detail, our results show that the echoes signal only appears when $(|Q|\le m)$ and $(|l|>m+\sqrt{m^2-Q^2})$ in this spacetime, while when the parameters demand $(|Q|>m)$, the echoes signal will be transformed into a quasinormal ringdown of the two-way traversable wormhole, and the charged black-bounce is a regular black hole with normal horizons by requiring $(|Q|\le m)$ and $(|l|<m-\sqrt{m^2-Q^2})$.

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Cited by in corpus (8)

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