For charged scalar perturbations of an Ernst-Schwarzschild black hole, the quasinormal-mode frequency scales as |q - q_c|^{1/2} near a critical charge q_c, with a mode-independent exponent.
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Universality in quasinormal modes of a magnetized black hole
For charged scalar perturbations of an Ernst-Schwarzschild black hole, the quasinormal-mode frequency scales as |q - q_c|^{1/2} near a critical charge q_c, with a mode-independent exponent.