Diffusion in relativistic systems

A Relativistic Diffusion Model (RDM) for high-energy heavy-ion collisions is outlined and used to investigate stopping and particle production. With three sources for particle production, the energy- and centrality dependence of rapidity distributions of net protons, and pseudorapidity distributions of charged hadrons in heavy systems at RHIC energies are precisely reproduced in the analytical model. The gradual approach to local thermal equilibrium is discussed for symmetric and asymmetric (d+Au) systems. The transport coefficients are extrapolated from Au+Au at RHIC energies (sNN=19.6-200GeV) to Pb+Pb at LHC energies of sNN=5.52TeV. Rapidity distributions for net protons, and pseudorapidity spectra for the produced charged particles are obtained and discussed in a three-sources model at LHC energies.