Causality and radiatively induced CPT violation
arXiv:hep-th/0105037 · doi:10.1016/S0370-2693(01)00678-5
Abstract
We consider quantum electrodynamics with an additional Lorentz- and CPT-violating axial-vector term in the fermionic sector and discuss the possibility that radiative corrections induce a Lorentz- and CPT-violating Chern-Simons-like term for the gauge field. From the requirement of causality and the assumed validity of perturbation theory, we conclude that the induced Chern-Simons-like term must be absent in the full quantum field theory.
LaTeX, 12 pages, 2 PS figures, v3: to appear in PLB
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