From Twistors to Gravitational Scattering

 Lecture 2: A Twistor Formula for the Tree-Level Gravity S-MatrixThis lecture will obtain a compact twistor formula for the full tree-level gravitational S-matrix beyond the self-dual sector.  It uses an extension of the complex geometry of twistor space of the previous lecture.  In the final formula, all integrations are saturated against delta functions yielding a sum of residues.  These depend on the n momenta and polarization vectors of associated gravity linear waves.Supported by the « 2021 Balzan Prize for Gravitation: Physical and Astrophysical Aspects », awarded to Thibault Damour