Dissipative scattering of spinning black holes at fourth post-Minkowskian order

TL;DR

This paper calculates the scattering of spinning black holes at the fourth post-Minkowskian order, including spin effects and radiative fluxes, using advanced quantum field theory techniques.

Contribution

It extends previous non-spinning scattering results to include spin-orbit effects at 4PM order using supersymmetric worldline quantum field theory.

Findings

Confirmed non-spinning 4PM scattering results

Extended calculations to include spin-orbit effects

Determined radiative fluxes at sub-leading PM order

Abstract

We compute the radiation reacted momentum impulse $\Delta p_i^\mu$, spin kick $\Delta S_i^\mu$, and scattering angle $\theta$ between two scattered spinning massive bodies (black holes or neutron stars) using the $\mathcal{N}=1$ supersymmetric worldline quantum field theory formalism up to fourth post-Minkowskian (4PM) order. Our calculation confirms the state-of-the-art non-spinning results, and extends them to include spin-orbit effects. Advanced multi-loop Feynman integral technology including differential equations and the method of regions are applied and extended to deal with the retarded propagators arising in a causal description of the scattering dynamics. From these results we determine a complete set of radiative fluxes at sub-leading PM order: the 4PM radiated four-momentum and, via linear response, the 3PM radiated angular momentum, both again including spin-orbit effects.