Traceless matrix commutator
arXiv:1309.2921v1 [hep-th] 11 Sep 2013 WIS/10/13 SEP-DPPA On Scale and Conformal Invariance in Four Dimensions Anatoly Dymarsky,a Zohar Komargodski,b Adam Schwimmer,b and Stefan Theisen c a DAMTP, University of Cambridge, Cambridge, CB3 0WA, UK b Weizmann Institute of Science, Rehovot 76100, Israel c Max-Planck-Institut fu¨r Gravitationsphysik, Albert-Einstein-Institut, 14476 Golm, Germany