Supercooled Goldstone Bosons at the QCD Chiral Phase Transition

Abstract

We discuss a universal non-equilibrium enhancement of long-wavelength Goldstone bosons induced by quenches to the broken phase in Model G -- the dynamical universality class of an $O(4)$-antiferromagnet and the chiral phase transition in QCD. Scaling arguments for the coarsening dynamics describing the formation of the chiral condensate predict a parametric enhancement in the infrared spectra of Goldstones, a prediction confirmed by stochastic simulations of the transition. 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.

7 pages, 4 figures; published version, see the companion paper "Quenching through the QCD chiral phase transition" arXiv:2504.03514

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Cited by in corpus (2)

• Quenching through the QCD chiral phase transition
• Goldstone bosons across thermal phase transitions