Collectivity in small and large amplitude microscopic mean-field dynamics

The time-dependent energy density functional with pairing allows to describe a large variety of phenomena from small to large amplitude collective motion. Here, we briefly summarize the recent progresses made in the field using the TD-BCS approach. A focus is made on the mapping of the microscopic mean-field dynamics to the macroscopic dynamics in collective space. A method is developed to extract the collective mass parameter from TD-EDF. Illustration is made on the fission of ²⁵⁸Fm. The collective mass and collective momentum associated to quadrupole deformation including non-adiabatic effects is estimated along the TD-EDF path. With these information, the onset of dissipation during fission is discussed.