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The photon propagator is built in the usual light-cone gauge (n2 = n.A = ∂ .A = 0) within the distributional approach with test functions for the gauge fields. It is shown that test functions provide a sound definition, as distributions, of singular terms in 1 (n.k)p . The relevance of these extensions is examplified in a test case where an infinite resummation in powers of 1 n.k leads to known exact results. The effect of residual gauge degrees of freedom on the presence of singular terms in the most general LC-propagator is discussed in the Dirac-Bergmann algorithm.

Light-cone gauge singularities in the photon propagator and residual gauge transformations