  Starting from the Bonn potential, relativistic Brueckner-Hartree-Fock (RBHF)
equations are solved for nuclear matter in the full Dirac space, which provides
a unique way to determine the single-particle potentials and avoids the
approximations applied in the RBHF calculations in the Dirac space with
positive-energy states (PESs) only. The uncertainties of the RBHF calculations
in the Dirac space with PESs only are investigated, and the importance of the
RBHF calculations in the full Dirac space is demonstrated. In the RBHF
calculations in the full Dirac space, the empirical saturation properties of
symmetric nuclear matter are reproduced, and the obtained equation of state
agrees with the results based on the relativistic Green's function approach up
to the saturation density.
