The authors formulate Kerr quasinormal modes as eigenvalues of a two-dimensional spectral problem, enabling simultaneous extraction of many modes and showing that near-horizon gradients in the extremal limit are coordinate artifacts.
Rotating black holes: Separable wave equations for gravitational and electromagnetic perturbations
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Quasinormal modes in Kerr spacetime as a 2D Eigenvalue problem
The authors formulate Kerr quasinormal modes as eigenvalues of a two-dimensional spectral problem, enabling simultaneous extraction of many modes and showing that near-horizon gradients in the extremal limit are coordinate artifacts.