Speaker
Description
I will review the worldline approach to reach high order PM results for the general relativistic two-body scattering problem thereby importing powerful multi-loop techniques from quantum field theory. We will discuss the simple structure of the classical limit amounting to the need to evaluate one-point functions in worldline quantum field theory at the tree-level, the inclusion of spin degrees of freedom via a worldline supersymmetry, the need to use the Schwinger-Keldysh formalism leading to the use of retarded propagators, as well as a discussion of the integration pipeline used in our approach. I will report on the recent completion of the 4PM spin-orbit computation for the impulse, scattering angle and spin-kick — both in the conservative and disspative cases. The later confirming the 4PM radiation reaction non-spinning results of Porto, Källen, Dlapa, Neff and Liu.
