  The momentum dependence of the empirical scalar and vector potentials needed
for describing relativistic heavy-ion collisions at 1 GeV/nucleon is compared
with that derived from self-consistent Dirac-Brueckner calculations using the
Bonn-A potential. Our calculated scalar and vector potentials exhibit a weak
momentum dependence and their magnitudes decrease with nucleon momentum, in
close similarity with the momentum dependence required by the empirical
potentials. The effects of explicit momentum dependence on the properties of
equilibrium nuclear matter are found to be small.
