Author(s): Andrea Geralico The frequency-domain waveform emitted by a two-body scattering process is computed in the extreme-mass-ratio limit through the fifth post-Minkowskian (PM) order [i.e., $O({G}^{5})$] and the fractional sixth post-Newtonian (PN) order. The current accuracy of the scattering waveform obtained by quantu… [Phys. Rev. Lett. 137, 081401] Published Tue Aug 18, 2026