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gr-qc2026
Dynamical thin shells in black hole ringdown
Han-Wen Hu, Chen Lan, Zong-Kuan Guo
We study how a radially oscillating thin shell outside a black hole (BH) affects gravitational wave ringdown and derive matching conditions for polar and axial perturbations from t…
gr-qc2026
Symmetry preservation in black hole quasinormal mode spectra
Han-Wen Hu, Chen Lan, Zong-Kuan Guo +1
We establish a general relation between symmetries of gravitational theories and black hole (BH) quasinormal mode (QNM) spectra. We show that a symmetry implies isospectrality when…