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Heat kernel expansions at finite temperature of massless QCD and chiral quarkmodels generate effective actions relevant for both low and high temperatureQCD. The key relevance of the Polyakov Loop to maintain the large andnon-perturbative gauge invariance at finite temperature is stressed.Comment: Talk given at 6th Conference on Quark Confinement and the Hadron  Spectrum, Villasimius, Sardinia, Italy, 21-25 Sep 200

Chiral Lagrangians at finite temperature and the Polyakov Loop