  We study the production of entropy in the context of a nonequilibrium chiral
phase transition. The dynamical symmetry breaking is modeled by a Langevin
equation for the order parameter coupled to the Bjorken dynamics of a quark
plasma. We investigate the impact of dissipation and noise on the entropy and
explore the possibility of reheating for crossover and first-order phase
transitions, depending on the expansion rate of the fluid. The relative
increase in S/N is estimated to range from 10% for a crossover to 200% for a
first-order phase transition at low beam energies, which could be detected in
the pion-to-proton ratio as a function of beam energy.
