Coherent States in Null-Plane Q.E.D

Abstract

Light front field theories are known to have the usual infra-red divergences of the equal time theories, as wellas new `spurious' infra-red divergences. The formar kind of IR divergences are usually treated by giving a small mass to the gauge particle. An alternative method to deal with these divergences is to calculate the transition matrix elements in a coherent state basis. In this paper we present, as a model calculation the lowest order correction to the three point vertex in QED using a coherent state basis in the light cone formalism. The relevant transition matrix element is shown to be free of the true IR divergences up to $O(e^2)$.

20 pages and two figures, REVTEX, ITP-SB-93-75

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• Scalar theories and symmetry breaking in the light-front coupled-cluster method
• Application of Coherent State Approach for the cancellation of Infrared divergences to all orders in LFQED