Non-perturbative gauge transformations of arbitrary fermion correlation functions in quantum electrodynamics
arXiv:2010.04160
Abstract
We study the transformation of the dressed electron propagator and the general -point functions under a change in the covariant gauge of internal photon propagators. We re-establish the well known Landau-Khalatnikov-Fradkin transformation for the propagator and generalise it to arbitrary correlation functions in configuration space, finding that it coincides with the analogous result for scalar fields. We comment on the consequences for perturbative application in momentum-space.
arXiv comment4 pages plus a supplementary appendix. Slight strengthening of final results
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