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gr-qc2026
Two Languages for the Same Resonance: From Nuclear Decay to Black-Hole Ringdown
Okuto Morikawa
Quantum resonances and black-hole quasinormal modes (QNMs) are described by closely related mathematics: radiative boundary conditions, analytic continuation of Green functions or…
gr-qc2026
Riesz--Laurent representation of black-hole scattering and sourced response at exceptional points
Okuto Morikawa, Shoya Ogawa, Takuya Hirose
At a black-hole exceptional point (EP), two quasinormal modes coalesce and their separate residues become ill-conditioned. Rather than postulating a near-degenerate modal fit, we d…