Orateur
Description
Most investigations of collective excitations in medium-heavy and heavy nuclei are based on nuclear density functional theory. These methods allow the description of the interplay between collective and single-particle motion, which is important for chirality and wobbling motion. Very successful relativistic and non-relativistic functionals are available nowadays. However, most of them are phenomenological functionals. Therefore it is crucial to study the connection of such functionals to ab-initio nucleon-nucleon forces. Non-relativistic Brueckner-Hartree-Fock theory was a starting point of ab-initio investigations in nuclear structure in the fifties and sixties. However, it failed because three-body forces were not included at that time. Later it was found that the relativistic Brueckner-Hartree-Fock (RBHF) theory can reproduce the saturation properties of nuclear matter. In this contribution, we discuss recent developments in RBHF theory for infinite nuclear matter and for finite nuclei. In particular, we study the effective masses for protons and neutrons. This quantity and its comparison with experimental data provide a reliable measure for nuclear ab-initio theories.
