Charged superradiant instability of spherically symmetric regular black holes in de Sitter spacetime: time- and frequency-domain analysis.
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| Title: | Charged superradiant instability of spherically symmetric regular black holes in de Sitter spacetime: time- and frequency-domain analysis. |
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| Authors: | Zhan, Yizhi1,2 (AUTHOR) niannian_12138@163.com, Xu, Hengyu1,2 (AUTHOR) xuhengyu0501@outlook.com, Chen, Haowei1,2 (AUTHOR) chenhaowei@zjut.edu.cn, Zhang, Shao-Jun1,2 (AUTHOR) sjzhang@zjut.edu.cn |
| Source: | European Physical Journal C -- Particles & Fields. May2026, Vol. 86 Issue 5, p1-11. 11p. |
| Subjects: | Black holes, Spacetime, Frequency-domain analysis, Time-domain analysis, Electrodynamics |
| Abstract: | We investigate the superradiant instability of Ayón-Beato–García–de Sitter (ABG-dS) black holes under charged scalar field perturbations, employing both time-domain evolutions and frequency-domain computations. We demonstrate that the instability manifests exclusively for the spherically symmetric mode with ℓ = 0 for both massless and massive scalar field perturbations. In contrast, asymptotically flat ABG black holes remain stable in the massless limit, a finding that highlights the crucial role of the cosmological horizon in providing a confining boundary. We further analyze the dependence of the instability growth rate on the cosmological constant Λ , the black hole charge Q, the scalar field charge q, and the scalar field mass μ. We find that the growth rate peaks at intermediate values of Λ and q, and increases monotonically with Q. Conversely, an increase in the scalar field mass μ suppresses the instability, eventually quenching it when μ is sufficiently large. Compared with Reissner–Nordström–de Sitter black holes, ABG-dS black holes exhibit distinct instability characteristics, which arise from the modified electrostatic potential induced by nonlinear electrodynamics. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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