Bare and Induced Lorentz and CPT Invariance Violations in QED

Understand

We consider QED in a constant axial vector background (\AE ther).

• Further Lorentz invariance violations (LIV) might occur owing to radiative corrections.
• The phenomenology of this model is studied, clarifying issues related to the various regularizations employed, with a particular emphasis on the induced photon mass.
• To this concern, it is shown that in the presence of LIV dimensional regularization may produce a radiatively induced finite photon mass.