In this work, we derive the conservative dynamics of non-spinning binaries in the massless scalar-tensor theories using the post-Minkowskian Effective Field Theory (EFT) approach. Our main result is an analytic expression of the scattering angle, computed up to third Post-Minkowskian order via two-loop Feynman diagrams. Our results are in perfect agreement with previous literature, in particular within the post-Newtonian limit.
@article{arxiv.2601.17503,
title = {Scattering angle at 3PM in scalar-tensor theories using the PM-EFT formalism},
author = {Laura Bernard and Tamanna Jain and Stavros Mougiakakos},
journal= {arXiv preprint arXiv:2601.17503},
year = {2026}
}