Effects of explicit SUf(3) breaking on the quark condensates

Effects of the explicit breaking of flavour symmetry on the quark condensates in the large-Nc limit are examined with the use of a QCD-motivated effective lagrangian. It is shown that, as the current mass increases, the non-perturbative quark condensate decreases in the absolute values, which agrees well with that obtained from QCD sum rules, not only qualitatively but also quantitatively. The condensates at finite temperature are also investigated in relation to the chiral transition. (orig.)