Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-02-11
Physics
High Energy Physics
High Energy Physics - Phenomenology
73 pp, 13 figures, Lectures presented at the Workshop on the Exact Renormalization Group, Faro, Portugal, 10-12 Sep 1998
Scientific paper
We review the formalism of the effective average action in quantum field theory which corresponds to a coarse grained free energy in statistical mechanics. The associated exact renormalization group equation and possible nonperturbative approximations for its solution are discussed. We describe in detail O(N)-symmetric scalar theories in two and three dimensions. These ideas are also applied to QCD where one observes the consecutive emergence of mesonic bound states and spontaneous chiral symmetry breaking as the coarse graining scale is lowered. We finally present a study of the chiral phase transition in two flavor QCD. 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 T_c turns out to be smaller than its zero temperature value.
Jungnickel Dirk-Uwe
Wetterich Christof
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