We discuss the universal non-equilibrium enhancement of long-wavelength Goldstone bosons induced by quenches to broken phase in Model G -- the dynamical universality class of an O (4) -antiferromagnet and chiral QCD phase transition. Generic scaling arguments predict a parametric enhancement in the infrared spectra of Goldstones, which is confirmed by fully-fledged stochastic simulations. The details of the enhancement are determined by the non-linear dynamics of a superfluid effective theory, which is a limit of Model G reflecting the broken O (4) symmetry. Our results translate to a parametric enhancement of low-momentum pions in heavy-ion collisions at the LHC, which are underpredicted in current hydrodynamic models without critical dynamics.
Florio et al. (Fri,) studied this question.