Chaichian, M.Chen, W. F.Felipe, Ricardo Gonzalez2014-06-022014-06-022001-03-22CHAICHIAN, M.; CHEN, W. F.; FELIPE, R. G. - Radiatively induced Lorentz and CPT violation in Schwinger constant field approximation. Physics Lettres B. ISSN 0370-2693. Vol. 503, nr. 1-2 (2001), p. 215-222.0370-269310.1016/S0370-2693(01)00196-4http://hdl.handle.net/10400.21/3600The 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. (C) 2001 Published by Elsevier Science B.V.engChern-Simons TermDifferential RegularizationDerivative ExpansionStandard ModelElectrodynamicsLimitsjournal article