A generalized photon propagator
arXiv:0705.0756 · doi:10.1088/1751-8113/40/30/F06
Abstract
A covariant gauge independent derivation of the generalized dispersion relation of electromagnetic waves in a medium with local and linear constitutive law is presented. A generalized photon propagator is derived. For Maxwell constitutive tensor, the standard light cone structure and the standard Feynman propagator are reinstated.