First numerical implementation of Hydro+ in an expanding fireball shows critical fluctuations lag behind equilibrium, advect outward, and feed back only mildly on the bulk flow in this simplified model.
Entropy production and reheating at the chiral phase transition
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abstract
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.
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Hydro+ in Action: Understanding the Out-of-Equilibrium Dynamics Near a Critical Point in the QCD Phase Diagram
First numerical implementation of Hydro+ in an expanding fireball shows critical fluctuations lag behind equilibrium, advect outward, and feed back only mildly on the bulk flow in this simplified model.