Wilson Coefficient For Vacuum Condensate Of Photons From Electrodynamics   Photon Propagator
  In the framework of the operator product expansion I provide a detailed evaluation of the contribution of the lowest photon condensate to the two-point photon Green function for four-dimensional spinor electrodynamics and three-dimensional scalar electrodynamics. Since the above mentioned condensate affects the part of the propagator contributing to physical amplitudes I suggest that this condensate could play a role in the non-perturbative dynamics of Abelian gauge field theories. 
A.R.Fazio (Wits University, Johannesburg)