We consider gravitational massive scalar-scalar scattering from unitarity and demonstrate how intermediate soft graviton behavior and the concept of extracting classical physics from localization of integrands on velocity cuts devise an efficient extraction scheme for computing the classical post-Minkowskian radial action perturbatively. We demonstrate the computational efficiency by deriving the scattering amplitudes in the probe regime to the fifth post-Minkowskian order in arbitrary dimensions.
@article{arxiv.2111.02976,
title = {Post-Minkowskian Radial Action from Soft Limits and Velocity Cuts},
author = {N. E. J. Bjerrum-Bohr and L. Plante and P. Vanhove},
journal= {arXiv preprint arXiv:2111.02976},
year = {2022}
}
Comments
34 pages. 5 figures. v3: Reorganized section 4 for better readability, and other various minor corrections. Version to appear in JHEP