%0 Journal Article
%T Radiatively Induced Lorentz and CPT Violation in Schwinger Constant Field Approximation
%A M. Chaichian
%A W. F. Chen
%A R. Gonzalez Felipe
%J Physics
%D 2000
%I arXiv
%R 10.1016/S0370-2693(01)00196-4
%X The Schwinger proper-time method is an effective calculation method, explicitly gauge invariant and nonperturbative. We make use of this method to investigate the radiatively induced Lorentz and CPT-violating effects in quantum electrodynamics when an axial vector interaction term is introduced in the fermionic sector. The induced Lorentz and CPT-violating Chern-Simons term coincides with the one obtained using a covariant derivative expansion but differs from the result usually obtained in other regularization schemes. A possible ambiguity in the approach is also discussed.
%U http://arxiv.org/abs/hep-th/0010129v2