[RBRC Seminar] Dynamics of the Chiral Condensate

by Derek Teaney

Thursday 17 Apr 2025, 12:30 → 14:30 US/Eastern

2-160 (https://bnl.zoomgov.com/j/1600983728?pwd=RAD7OLcqre7Ycsp6JfFp6HAnpyLxex.1)

We present a detailed numerical and analytical study of the out-of-equilibrium dynamics of Model G, the dynamical universality class relevant to the chiral phase transition. We perform numerical 3D stochastic (Langevin) simulations of the $O(4)$ critical point for large lattices in the chiral limit. We quench the system from the high-temperature unbroken phase to the broken phase and study the non-equilibrium dynamics of pion fields. Strikingly, the non-equilibrium evolution of the two-point functions exhibits a regime of growth, a parametrically  large enhancement, and a subsequent slow relaxation to equilibrium. We interpret numerical results using mean-field theory and dynamical critical scaling. The same behavior persists in continuous ramps through the chiral phase transition, and the dynamics exhibit Kibble-Zurek scaling. We relate the growth of the two-point functions to a parametric enhancement of soft pion yields relative to thermal equilibrium.