Point Splitting and U(1) Gauge Invariance
Abstract
Description
A gauge transformation in quantum electrodynamics involves the product of field operators at the same space-time point and hence does not have a well-defined meaning. One way to avoid this difficulty is to generalize the gauge transformation by using different space-time points in the spirit of Dirac's point splitting. Such a generalization indeed exists and the resulting infinitesimal gauge transformation takes the form of an infinite series in the coupling constant. In this text I will present two examples of generalized gauge transformations.
6 pages, 0 figures, to be published in the proceedings of the NATO ASI Summer School held in Cargese, July 26 - August 7, 1999 : Particle Physics, Ideas and Recent Developments
6 pages, 0 figures, to be published in the proceedings of the NATO ASI Summer School held in Cargese, July 26 - August 7, 1999 : Particle Physics, Ideas and Recent Developments