Abstract
Massless quantum electrodynamics is formulated as a field-theoretical «bootstrap». The resulting equations are interpreted as self-consistent equations for the physical electric charge following Adler's conjecture. The group-theoretical properties of these equations are investigated. It is shown that they are not invariant under the conformal groupO4.2 in conventional gauges, but that in other gauges a generalized «bootstrap» can be formulated which admitsO4,2 as its invariance group. The relevance of these group properties to the determination of α and to massive quantum electrodynamics is suggested.
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