Using the eikonal approximation for quantum scattering I will argue that the non-relativistic and ultra-relativistic limits of classical gravitational scattering are smoothly connected at the 3rd Post-Minkowskian (PM) level provided radiation reaction effects are properly taken into account. This solved, about a year ago, a two-year-old puzzle raised by the first 3PM result by Bern et al. Extending the connection to the next PM order looks both important and non-trivial.

Youtube link: https://youtu.be/BqsGaTggZ24