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- W43453449 abstract "We employ non-perturbative 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 like the chiral condensate or the pion mass. Our treatment covers both the chiral perturbation theory domain of validity and the domain of validity of universality associated with critical phenomena: We explicitly connect the physics at zero temperature and realistic quark mass with the universal behavior near the critical temperature $T_c$ and the chiral limit. For realistic quark masses the pion correlation length near $T_c$ turns out to be smaller than its zero temperature value. In the vicinity of $T_c$ and zero quark mass we obtain a precision estimate of the universal critical equation of state. It belongs to the universality class of the three dimensional O(4) symmetric Heisenberg model. We also investigate scalar field theories directly in three dimensions near second order and first order phase transitions. In particular, we obtain the universal equation of state for weak first order phase transitions in scalar matrix models. We also study the coarse grained free energy. Its dependence on the coarse graining scale gives a quantitative criterion for the validity of Langer's theory of spontaneous bubble nucleation." @default.
- W43453449 created "2016-06-24" @default.
- W43453449 creator A5044620763 @default.
- W43453449 date "1997-08-13" @default.
- W43453449 modified "2023-09-27" @default.
- W43453449 title "Universal Critical Equation of State and the Chiral Phase Transition in QCD" @default.
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