Krein Regularization of QED
  In this paper the electron self-energy, photon self-energy and vertex functions are explicitly calculated in Krein space quantization including quantum metric fluctuation. The results are automatically regularized or finite. The magnetic anomaly and Lamb shift are also calculated in the one loop approximation in this method. Finally, our results are compared to conventional QED results. 
B. Forghan, M.V. Takook and A. Zarei
hep-ph