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Feng-Yin Cheng

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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. · 0 citations

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