A recent experiment by Antonini et. al. [Phys. Rev. A {\bf 71}, 050101R 2005], set new limits on Lorentz violating parameters in the frame-work of the photon sector of the Standard Model Extension (SME), κ~e−ZZ, and the Robertson-Mansouri-Sexl (RMS) framework, β−δ−1/2. The experiment had significant systematic effects caused by the rotation of the apparatus which were only partly analysed and taken into account. We show that this is insufficient to put a bound on κ~e−ZZ and the bound on β−δ−1/2 represents a five-fold improvement not a ten-fold improvement as claimed. (For reply see Phys. Rev. A 72, 066102 (2005) DOI: 10.1103/PhysRevA.72.066102)
@article{arxiv.physics/0601186,
title = {Comment on "Test of constancy of speed of light with rotating cryogenic optical resonators"},
author = {Michael E. Tobar and Peter Wolf and Paul L. Stanwix},
journal= {arXiv preprint arXiv:physics/0601186},
year = {2007}
}