Chiral symmetry breaking and instantons in both quenched and full QCD


We investigate the contribution that instantons make to the QCD chiral con-densate for N f = 0, 1 and 2 quark flavours. We use a simplified model: the instantons are a (weighted) gas, the fermionic integrations are restricted to the subspace spanned by the would-be zero-modes and only the dimensional and chiral features of the Dirac operator are retained… (More)

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