Preprint
Sep 2026
An Effective $S$-Matrix Approach to Low-Frequency Waveforms from Black Hole Mergers
We develop an on-shell description of low-frequency gravitational waveforms from black-hole mergers beyond leading order. Treating the strongly coupled merger as effective hard $S$-matrix data, we organize its long-wavelength response using soft theorems and the KMOC formalism. At next-to-leading order, the quantum sof...
Katsuki Aoki, Feng-Yin Cheng, Andrea Cristofoli et al.
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