  We performed Self-Consistent Greens Function (SCGF) calculations for
symmetric nuclear matter using realistic nucleon-nucleon (NN) interactions and
effective low-momentum interactions ($V_{low-k}$), which are derived from such
realistic NN interactions. We compare the spectral distributions resulting from
such calculations. We also introduce a density-dependent effective low-momentum
interaction which accounts for the dispersive effects in the single-particle
propagator in the medium.
