Vacuum Photon Splitting in Lorentz-Violating Quantum Electrodynamics

Abstract

Radiative corrections arising from Lorentz violation in the fermion sector induce a nonzero amplitude for vacuum photon splitting. At one loop, the on-shell amplitude acquires both CPT-even and CPT-odd contributions forbidden in conventional electrodynamics.

Comments: 4 pages, minor wording changes, references added, accepted in Physical Review Letters