1302.2375 (R. Casana et al.)

Radiative generation of the CPT-even gauge term of the SME from a
dimension-five nonminimal coupling term    [PDF]

R. Casana, M. M. Ferreira Jr, R. V. Maluf, F. E. P. dos Santos

In this letter we show for the first time that the usual CPT-even gauge term of the standard model extension (SME) can be radiatively generated, \textbf{}in a gauge invariant level, in the context of a modified QED endowed with a dimension-five nonminimal coupling term recently proposed in the literature. As a consequence, the existing upper bounds on the coefficients of the tensor $(K_{F}) $ can be used improve the bounds on the magnitude of the nonminimal coupling, $\lambda(K_{F}),$ by the factors $10^{5}$ or $10^{25}.$ The nonminimal coupling also generates higher-order derivative contributions to the gauge field effective action quadratic terms.

View original: http://arxiv.org/abs/1302.2375