Abstract
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 and which is of the same order as the best previous result for the former and represents a 30-fold improvement for the latter.
- Received 3 October 2002
DOI:https://doi.org/10.1103/PhysRevLett.90.060402
©2003 American Physical Society