3 papers
hep-th2026
An Effective -Matrix Approach to Low-Frequency Waveforms from Black Hole Mergers
Katsuki Aoki, Feng-Yin Cheng, Andrea Cristofoli +2
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 …
hep-th2024
On-Shell Approach to Black Hole Mergers
Katsuki Aoki, Andrea Cristofoli, Yu-tin Huang
We develop an on-shell approach to study black hole mergers. Since, asymptotically, the initial and final states can be described by point-like spinning particles, we propose a mas…
hep-th2023
Anomalous Thresholds for the S-matrix of Unstable Particles
Katsuki Aoki, Yu-tin Huang
In this work, we study the analytic properties of S-matrix for unstable particles, which is defined as the residues on the unphysical sheets where unstable poles reside. We demonst…