Anomalies in gauge theory and gerbes over quotient stacks
arXiv:0709.1668 · doi:10.1016/j.geomphys.2008.03.010
Abstract
We give a new interpretation of the Faddeev-Mickelsson anomaly in certain Yang-Mills theories in terms of S^1-central extensions of Lie groupoids.
v2. 27 pages, content reorganized