The gauge field propagator for QED and linearized QCD in inhomogeneous media

Abstract
The gauge field propagator is calculated in configuration space using an expansion in spherical harmonics for the scalar Green function and in vector spherical harmonics for the tensorGreen function. We work in the Coulomb gauge where the scalar Green function is instantaneous and the frequency‐dependent tensorGreen function is transverse. Explicit expressions are obtained to solve for the propagators in the presence of inhomogeneous dielectric media.

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