Description
Abstract: In this talk, I present the calculation of the scattering waveform up to next-toleading
order in the post-Minkowskian (PM) expansion. I compare two
complementary strategies: the traditional QFT approach and the WQFT framework.
I discuss in detail the construction of the relevant five-point amplitude using the
numerical unitarity method and illustrate the practical use of the amplitudes code
“Caravel”. I then outline the WQFT procedure, which allows us to lift seven-point
tree amplitudes to the one-loop integrand. These two approaches provide
independent cross-checks, and I explain how this validation works in practice. I
conclude by discussing the resulting scattering waveform in impact-parameter
space.
