Abstract
We introduce momentum-dependent scalar and vector fields into the Lorentz covariant relativistic BUU (RBUU) approach employing a polynomial ansatz for the relativistic nucleon-nucleon interaction. The momentum-dependent parametrizations are shown to be valid up to about 1 GeV/u for the empirical proton-nucleus optical potential. We perform numerical simulations for heavy-ion collisions within the RBUU approach adopting momentum-dependent and momentum-independent mean fields and calculate the transverse flow in and perpendicular to the reaction plane, the directivity distribution as well as subthreshold K +-production. By means of these observables we discuss the particular role of the momentum-dependent forces and their implications on the nuclear equation of state. We find that only a momentum-dependent parameter set can explain the experimental data on the transverse flow in the reaction plane from 150–1000 MeV/u and the differential K +-production cross sections at 1 GeV/u at the same time.
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