2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179889We discuss how to obtain the nonrelativistic limit of a self-consistent relativistic effective field theory for dynamic problems. It is shown that the standard v/c expansions yields Galilean invariance only to first order in v/c, whereas second order is required to obtain important contributions such as the spin-orbit force. We propose a modified procedure which is a mapping rather than a strict v/c expansion.4 pages, accepted for publication in Physical Review LettersNuclear Theorytext