DOI: 10.1140/epjc/s2003-01167-7
On the effective lagrangian in spinor electrodynamics with added violation of Lorentz and CPT-symmetries
Yu.A. Sitenko1, 2 and K.Yu. Rulik1, 31 Bogolyubov Institute for Theoretical Physics, National Academy of Sciences, 03143 Kyiv, Ukraine
2 Institute for Theoretical Physics, University of Berne, Sidlerstrasse 5, 3012 Berne, Switzerland
3 Dipartimento di Fisica Teorica, Universitá di Torino, Via P. Giuria 1, 10125 Torino, Italy
(Received: 29 January 2003 / Published online: 24 March 2003)
Abstract
We consider quantum electrodynamics with additional coupling
of
spinor fields to the space-time independent axial vector violating
both Lorentz and
CPT-symmetries. The Fock-Schwinger proper-time
method is used to calculate the one-loop effective action up
to
the second order in the axial vector and to all orders in the
space-time independent electromagnetic field strength. We find
that the Chern-Simons term is not radiatively induced and that
the
effective action is
CPT-invariant in the given approximation.
© Società Italiana di Fisica, Springer-Verlag 2003
