Speaker
Description
The remarkable detection of gravitational waves (GWs) by Ligo-Virgo-Kagra interferometers has opened the new era of multimessenger astrophysics. An analytic understanding of GWs waveform allows us to construct precise GWs templates, which are needed to detect signals via matched filtering analyses.
In this talk, I will combine the observable-based formalism (KMOC), the analytic properties of scattering amplitudes, generalised unitarity and the heavy mass expansion with a newly introduced IBP reduction for Fourier integrals, to provide an efficient framework for computing scattering waveforms. Such properties are based on a recent understanding of frequency space waveforms as twisted period integrals, which can be studied using Twisted Cohomology. Using these techniques, we were able to derive for the first time the analytic expression for the next-to-leading-order (NLO) waveform in General Relativity.
