The frequencies of a cryogenic sapphire oscillator and a hydrogen maser are compared to set new constraints on a possible violation of Lorentz invariance. We determine the variation of the oscillator frequency as a function of its orientation (Michelson-Morley test) and of its velocity (Kennedy-Thorndike test) with respect to a preferred frame candidate. We constrain the corresponding parameters of the Mansouri and Sexl test theory to δ−β+1/2≤3.4×10−9 and β−α−1≤4.1×10−7 which is of the same order as the best previous result for the former and represents a 50 fold improvement for the latter. These results correspond to an improvement of our previously published limits [Wolf P. et al., Phys. Rev. Lett. {\bf 90}, 6, 060402, (2003)] by about a factor 2. We describe the changes of the experiment, and show the new data that lead to that improvement.
@article{arxiv.gr-qc/0306047,
title = {Tests of Lorentz Invariance Using a Microwave Resonator: An Update},
author = {P. Wolf and S. Bize and A. Clairon and A. N. Luiten and G. Santarelli and M. E. Tobar},
journal= {arXiv preprint arXiv:gr-qc/0306047},
year = {2007}
}
Comments
6 pages, 2 figures, to appear in Proc. of the 2003 joint IEEE FCS/EFTF meeting, to appear in Proc. of the 2003 Rencontres de Moriond