2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/110435Relativistic and non-relativistic modern nucleon-nucleon potentials are mapped on a relativistic operator basis using projection techniques. This allows to compare the various potentials at the level of covariant amplitudes were a remarkable agreement is found. In nuclear matter large scalar and vector mean fields of several hundred MeV magnitude are generated at tree level. This is found to be a model independent feature of the nucleon-nucleon interaction.14 pages, 5 figures, proceedings to the XLIV International Winter Meeting on Nuclear Physics, Bormio, ItalyNuclear Theorytext