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Properties of symmetric and asymmetric nuclear matter have been investigatedin the relativistic Dirac-Brueckner-Hartree-Fock approach based on projectiontechniques using the Bonn A potential. The momentum, density, and isospindependence of the optical potentials and nucleon effective masses are studied.It turns out that the isovector optical potential depends sensitively ondensity and momentum, but is almost insensitive to the isospin asymmetry.Furthermore, the Dirac mass $m^*_D$ and the nonrelativistic mass $m^*_{NR}$which parametrizes the energy dependence of the single particle spectrum, areboth determined from relativistic Dirac-Brueckner-Hartree-Fock calculations.The nonrelativistic mass shows a characteristic peak structure at momentaslightly above the Fermi momentum $\kf$. The relativistic Dirac mass shows aproton-neutron mass splitting of $m^*_{D,n} <m^*_{D,p}$ in isospin asymmetricnuclear matter. However, the nonrelativistic mass has a reversed mass splitting$m^*_{NR,n} >m^*_{NR,p}$ which is in agreement with the results fromnonrelativistic calculations.Comment: 25 pages, 12 figures, to appear in Physical Review

Momentum, density, and isospin dependence of symmetric and asymmetric nuclear matter properties