Entropy production and reheating at the chiral phase transition

Christoph Herold , Apiwit Kittiratpattana , Chinorat Kobdaj , Ayut Limphirat , Yupeng Yan , Marlene Nahrgang (1) , Jan Steinheimer , Marcus Bleicher

1 SUBATECH - Laboratoire de physique subatomique et des technologies associées

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 100% 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.

Mots clés: chiral phase transition; nonequilibrium dynamics; heavy-ion collisions; Chiral phase transition; Nonequilibrium dynamics; Heavy-ion collisions; critical phenomena: chiral; entropy: production; beam: energy; quark: plasma; heavy ion: scattering; reheating; dynamical symmetry breaking; Langevin equation; dissipation; Bjorken; noise; fluid

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique des Hautes Energies - Théorie [hep-th]

Christoph Herold, Apiwit Kittiratpattana, Chinorat Kobdaj, Ayut Limphirat, Yupeng Yan, et al.. Entropy production and reheating at the chiral phase transition. Phys.Lett.B, 2019, 790, pp.557-562. ⟨10.1016/j.physletb.2019.02.004⟩. ⟨hal-01902944⟩