The Boltzmann-Langevin model for nuclear collisions

An extension of the one-body transport models is developed by incorporating correlations into the equation of motion in a stochastic approximation. In the semi-classical limit, this yields the Boltzmann-Langevin Equation for the fluctuating single-particle density in the phase-space. In order to investigate the gross-properties of density fluctuations in heavy-ion collisions, a number of calculations have been carried out. These calculations reveal that large dynamical fluctuations are introduced into the momentum space during the early stages of the collision, which cause the nuclear system to decay into a great variety of final channels. The effects of the fluctuations on the kaon production in heavy-ion collisions at sub-threshold energies are also investigated. (orig.)