The chiral torsional anomaly and the Nieh-Yan invariant with and without boundaries by Johanna Erdmenger, Ioannis Matthaiakakis, René Meyer, Dmitri Vassilevich

“…Abstract There exists a long-standing debate regarding the torsion contribution to the 4d chiral anomaly of a Dirac fermion. Central to this debate is the Nieh-Yan anomaly, which has been considered ill-defined and a regularization artifact. …”
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Worldline Path-Integral Representations for Standard Model Propagators and Effective Actions by Somdatta Bhattacharya

“…The treatment of the fermionic one-loop effective actions leads to a particularly economical derivation of chiral anomalies and the gauge anomaly freedom in the Standard Model, improving upon the state of the art in the literature. …”
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