A centered first-jet basis for neighboring quasinormal modes in finite time windows replaces the ill-conditioned sum of two resolved damped exponentials with a carrier plus t exp(-i omega_c t) term when the dimensionless splitting eta is small.
Motohashi, Physical Review Letters134, 141401 (2025)
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Finite-Window Centered Organization of Neighboring Poles
A centered first-jet basis for neighboring quasinormal modes in finite time windows replaces the ill-conditioned sum of two resolved damped exponentials with a carrier plus t exp(-i omega_c t) term when the dimensionless splitting eta is small.