2001/09/13 by Guy Bonneau, Bonneau, Guy
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Theory (hep-th) #hep-th
paper · pdf · doi:10.48550/arxiv.hep-th/0109105
7 pages, LaTex file, 2 references added
arxiv created 2001/10/10 · arxiv updated 2009/11/30
We rediscuss the recent controversy on a possible Chern-Simons like term generated through radiative corrections in QED with a CPT violating term. We emphasize the fact that any absence of an \sl a priori divergence should be explained by some symmetry or some non-renormalisation theorem : otherwise, no prediction can be made on the corresponding quantity.