Physical (ir)relevance of ambiguities to Lorentz and CPT violation in QED

Details Physical (ir)relevance of ambiguities to Lorentz and CPT violation in QED Physical (ir)relevance of ambiguities to Lorentz and CPT violation in QED

2001-02-05

arxiv.org/abs/hep-th/0102021v2

JHEP 0104:032,2001

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, references added

Scientific paper

10.1088/1126-6708/2001/04/032

We discuss the regularization and renormalization of QED with Lorentz and CPT violation, and argue that the coefficient of the Chern-Simons term is an independent parameter not determined by gauge invariance. We also study these issues in a model with spontaneous breaking of Lorentz and CPT symmetries and find an explicit relation with the ABJ anomaly. This explains the observed convergence of the induced Chern-Simons term.

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