Abstract
The gravitational contribution to the chiral anomaly is analysed in the framework of the Poincaré gauge theory. It is shown that an additional CP-violating term θ ∗ RR in the effective lagrangian in equivalent to a shift in the mass of the Taub-NUT metric as felt by fermions. This analogue of the Witten effect is discussed in conjunction with the appearance of torsion in recently found exact solutions.
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