https://doi.org/10.1140/epjc/s10052-024-13512-z
Regular Article - Theoretical Physics
Stability of Cauchy horizon in Einstein–Power–Maxwell–de Sitter black holes
1
School of Physics, Changchun Normal University, 130032, Changchun, Jilin, China
2
Department of Physics, Southern University of Science and Technology, 518055, Shenzhen, China
b
12031329@mail.sustech.edu.cn
Received:
22
August
2024
Accepted:
15
October
2024
Published online:
2
November
2024
We investigated the Strong Cosmic Censorship (SCC) conjecture in Einstein–Power–Maxwell–de Sitter (EPMdS) black holes by analyzing the quasinormal modes (QNMs) of a massless neutral scalar field perturbation. Using the pseudospectral method, we calculated the QNM frequencies across various cosmological constants and nonlinear electromagnetic parameters. Our results show that for black holes far from extremality, the lowest QNM frequency 
remains below 1/2. However, as the black holes approach extremality, the lowest mode’s consistently exceeds 1/2, leading to a violation of SCC. Moreover, with a fixed cosmological constant, as the nonlinearity parameter 
increases, the interval of SCC violation under the charge extremality ratio narrows. Considering that 
is inversely proportional to , our results indicate that increasing the order k of the non-linear electromagnetic field can effectively mitigate SCC violations.
© The Author(s) 2024
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