Photon decay in a CPT-violating extension of quantum electrodynamics Original Research Article

We consider the process of photon decay in quantum electrodynamics with a CPT-violating Chern–Simons-like term added to the action. For a simplified model with only the quadratic Maxwell and Chern–Simons-like terms and the quartic Euler–Heisenberg term, we obtain a nonvanishing probability for the decay of a particular photon state into three others.