%0 Journal Article
%T Comment on: Topological Invariants, instantons, and the chiral anomaly on spaces with torsion
%A Dirk Kreimer
%A Eckehard W. Mielke
%J Physics
%D 1999
%I arXiv
%R 10.1103/PhysRevD.63.048501
%X In Riemann-Cartan spacetimes with torsion only its axial covector piece $A$ couples to massive Dirac fields. Using renormalization group arguments, we show that besides the familiar Riemannian term only the Pontrjagin type four-form $dA\wedge dA$ does arise additionally in the chiral anomaly, but not the Nieh-Yan term $d^\star A$, as has been claimed in a recent paper [PRD 55, 7580 (1997)].
%U http://arxiv.org/abs/gr-qc/9904071v2