We report Relativity tests based on data from two simultaneous Michelson-Morley experiments, spanning a period of more than one year. Both were actively rotated on turntables. One (in Berlin, Germany) uses optical Fabry-Perot resonators made of fused silica; the other (in Perth, Australia) uses microwave whispering-gallery sapphire resonators. Within the standard model extension, we obtain simultaneous limits on Lorentz violation for electrons (5 coefficients) and photons (8) at levels down to 10−16, improved by factors between 3 and 50 compared to previous work.
@article{arxiv.0706.2031,
title = {Relativity tests by complementary rotating Michelson-Morley experiments},
author = {Holger Mueller and Paul Louis Stanwix and Michael Edmund Tobar and Eugene Ivanov and Peter Wolf and Sven Herrmann and Alexander Senger and Evgeny Kovalchuk and Achim Peters},
journal= {arXiv preprint arXiv:0706.2031},
year = {2008}
}