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gr-qc2025
Quasinormal modes of Schwarzschild-de Sitter black holes in semi-open systems
Liang-Bi Wu, Libo Xie, Li-Ming Cao +2
We study perturbations of Schwarzschild-de Sitter black holes in semi-open systems by using the Heun functions. For the semi-open system, a partially reflective wall is added aroun…
gr-qc2025
Waveform stability for the piecewise step approximation of Regge-Wheeler potential
Liang-Bi Wu, Libo Xie, Yu-Sen Zhou +2
By interpreting the difference between the original Regge-Wheeler potential and its piecewise step approximation as perturbative effects induced by the external environment of the…
gr-qc2025
Spectrum instability and greybody factor stability for parabolic approximation of Regge-Wheeler potential
Libo Xie, Liang-Bi Wu, Zong-Kuan Guo
We investigate the stability of QNM spectra and greybody factors in the Schwarzschild black hole by approximating the Regge-Wheeler potential with a piecewise parabolic form and tr…