Feynman propagator for the nonbirefringent CPT-even electrodynamics of the Standard Model Extension

Rodolfo Casana, Manoel M. Ferreira, Adalto R. Gomes +1

The CPT-even gauge sector of the Standard Model Extension is composed of nineteen components comprised in the tensor $(K_F{)}_{\mu \nu \rho \sigma }$, of \ which nine do not yield birefringence. I…