Pion currents thus couple to the axial vector current and pions participate in the chiral anomaly.
2.
The boundary condition is provided by the requirement of continuity of the axial vector current across the bag boundary.
3.
Bardeen is co-inventor of the theory of the axial vector current anomaly which is of foundational importance in modern theoretical physics.
4.
There is a mysterious relationship between the strong interaction coupling of the pions to the nucleons, the coefficient in the gradient coupling model, and the axial vector current coefficient of the nucleon which determines the weak decay rate of the neutron.
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