Echoes of charged black-bounce spacetimes

S. R. Wu; B. Q. Wang; Dong Liu; Z. W. Long

doi:10.1140/epjc/s10052-022-10938-1

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2022) 82: 998
https://doi.org/10.1140/epjc/s10052-022-10938-1

Regular Article - Theoretical Physics

Echoes of charged black-bounce spacetimes

S. R. Wu¹, B. Q. Wang², Dong Liu¹ and Z. W. Long¹^d

¹ College of Physics, Guizhou University, 550025, Guiyang, China
² College Pharmacy, Guizhou University of Traditional Chinese Medicine, 550025, Guiyang, China

^d zwlong@gzu.edu.cn

Received: 4 July 2022
Accepted: 20 October 2022
Published online: 7 November 2022

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 $(| Q | \leq m)$ $(|{Q}|\le m)$ and $(| l | > m + \sqrt{m^{2} - Q^{2}})$ $(|{l}|> m+ \sqrt{m ^{2}-Q^{2} })$ in this spacetime, while when the parameters demand $(| Q | > m)$ $$(|{Q}|>m)$$ , 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 $(| Q | \leq m)$ $(|{Q}|\le m)$ and $(| l | < m - \sqrt{m^{2} - Q^{2}})$ $(|{l}|< m-\sqrt{m ^{2}-Q^{2} })$ .

© The Author(s) 2022

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