| Sunday 22 December 2024 | |
| Events for day: Tuesday 30 January 2024 |
| 14:00 - 15:00 Weekly Seminar HEPCo Group On Torsion Contribution to Chiral Anomaly via Nieh-Yan Term School PHYSICS In this talk, we present a solution to the question of whether or not, in the presence of torsion, the topological Nieh-Yan term contributes to chiral anomaly. The integral of Nieh-Yan term is non-zero if topology is non-trivial; the manifold has a boundary or vierbeins have singularities. Noting that singular Nieh-Yan term could be written as a sum of delta functions, we argue that the heat kernel expansion cannot end at finite steps. This leads to a sinusoidal dependence on the Nieh-Yan term and the UV cut-off of the theory (or alternatively the minimum length of spacetime). We show this ill-behaved dependence can be removed if a quantizati ... |