MICROSCOPIC STRUCTURE OF SHOCKS IN ONE CONSERVATION-LAWS

We show that in one conservation laws, the disturbances are propagated along the characteristic lines and shocks. We use this to investigate the macroscopic behavior of the second class particles in stochastic models such as asymmetric simple exclusion and zero range processes, i n one space dimension. We show that a second class particle will follo w the characteristic lines and shocks of the hydrodynamic equation.