Description:

Abstract: The classical scattering of spinning objects is well described by the spinor-helicity formalism for heavy particles. Using these variables, we derive the relevant amplitudes for the scattering at the first post-Minkowskian (1PM) order and the spurious-pole-free, all-spin opposite-helicity Compton amplitudes in the classical limit for QED, QCD, and gravity. The cured amplitudes are subject to deformations by contact terms, the vast majority of whose contributions we can fix by imposing a relation between spin structures motivated by lower spin multipoles of black hole scattering at 2PM. Our gravitational Compton amplitude allows us to push the state-of-the-art of spinning 2PM scattering to any order in the spin vectors of both objects.

Speaker: Dr. Rafael Aoude, Louvain University, Belgium