The PCAC relation in the NJL model in the BS/Faddeev approach

Evaluations of bound state expectation values of quantized one-body operators in the canonical operator formalism are reviewed, based on the Bethe-Salpeter(BS)/Faddeev approach in the NJL model. The PCAC relation in the BS/Faddeev approach is derived without assuming any particular form of the Bethe-Salpeter kernel. These results are applied to ladder truncation schemes and the truncation scheme in which the qq interactions induced by the q exchange in the pion and sigma mesonic channel are included.