  Fermionic Molecular Dynamics (FMD) models a system of fermions by means of
many-body states which are composed of antisymmetrized products of
single-particle states. These consist of one or several Gaussians localized in
coordinate and momentum space. The parameters specifying them are the dynamical
variables of the model. As the repulsive core of the nucleon-nucleon
interaction induces short range correlations which cannot be accommodated by a
Slater determinant, a novel approach, the unitary correlation operator method
(UCOM), is applied. The unitary correlator moves two particles away from each
other whenever their relative distance is within the repulsive core. The
time-dependent variational principle yields the equations of motion for the
variables. Energies of the stationary ground states are calculated and compared
to exact many-body results for nuclei up to Ca 48. Time-dependent solutions are
shown for collisions between nuclei.
