Derivative expansion for the effective action of chiral gauge fermions. The abnormal parity component
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Explicit exact formulas are presented, for the leading order term in a strict chiral covariant derivative expansion, for the abnormal parity component of the effective action of two- and four-dimensional Dirac fermions in the presence of scalar, pseudo-scalar, vector and axial vector background fields. The formulas hold for completely general internal symmetry groups and general configurations. In particular, the scalar and pseudo-scalar fields need not be on the chiral circle.
KeywordsSymmetry Group Order Term Effective Action Axial Vector Exact Formula
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