Speaker
Description
The classical limit of scattering amplitudes provides a convenient strategy to calculate gravitational observables associated to black-hole encounters. Taking this limit requires a resummation in the effective coupling, known as the eikonal exponentiation. In this talk, I will present recent progress on the operator version of this exponentiation, which combines elastic (two-to-two) with inelastic (two-to-three) channels to produce a unitary description of the scattering process. I will illustrate how including tree-level and one-loop contributions to the eikonal operator allows us to access the leading and subleading waveforms describing the gravitational waves produced during a black-hole scattering process. The latter involve the so-called tail effects, whereby the emitted gravitational radiation can re-scatter against the curvature induced by each black hole.
