Key points are not available for this paper at this time.
We employ nonperturbative flow equations to compute the equation of state for two flavor QCD within an effective quark meson model. This yields the temperature and quark mass dependence of quantities such as the chiral condensate or the pion mass. A precision estimate of the universal critical equation of state for the three-dimensional O (4) Heisenberg model is presented. We explicitly connect the O (4) universal behavior near the critical temperature and zero quark mass with the physics at zero temperature and a realistic pion mass. For realistic quark masses the pion correlation length near T₂ turns out to be smaller than its zero temperature value.
Berges et al. (Fri,) studied this question.