Gauge dependence of the infrared behaviour of massless QED_3
arXiv:hep-th/0510055 · doi:10.1016/j.physletb.2006.02.016
Abstract
Using the Zumino identities it is shown that in a class of non-local gauges, massless QED_3 has an infrared behaviour of a conformal field theory with a continuously varying anomalous dimension of the fermion. In the usual Lorentz gauge, the fermion propagator falls off exponentially for a large separation, but this apparent fermion mass is a gauge artifact.
10 pages; changes made mainly to clarify the result in the usual Lorentz gauge; to appear in Phys. Lett. B