Nonperturbative Flow Equations and Low--Energy QCD

Details Nonperturbative Flow Equations and Low--Energy QCD Nonperturbative Flow Equations and Low--Energy QCD

1996-10-11

arxiv.org/abs/hep-ph/9610336v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

34 pages, 4 figures ; Based on invited talks by the authors at the `Workshop on Quantum Chromodynamics: Confinement, Collision

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. This is 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 phenomenological importance of non--renormalizable terms in the effective linear meson model.

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