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gr-qc2026
Exceptional points of the Schwarzschild spectrum under local potential perturbation: The Princess and the Pea
Mohamed Ould El Hadj, Sam R. Dolan
Black-hole quasinormal modes (QNMs) may coalesce at exceptional points (EPs) in the frequency spectrum. We study EPs and their phenomenology for gravitational perturbations of a Sc…
gr-qc2026
Ringdown and echoes from compact objects: Debye series and Debye quasinormal modes
Mohamed Ould El Hadj, Sam R. Dolan
We introduce a new series decomposition of the waveform constructed in the spirit of Debye expansions in scattering theory, and we use this to analyse the time-domain response of c…