Lorentz and CPT Violating Chern-Simons Term in the Derivative Expansion of QED

Abstract

We calculate by the method of dimensional regularization and derivative expansion the one-loop effective action for a Dirac fermion with a Lorentz-violating and CPT-odd kinetic term in the background of a gauge field. We show that this term induces a Chern-Simons modification to Maxwell theory. Some related issues are also discussed.

6 pages, no figure, RevTex, A revised version

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