Tests of Lorentz invariance using a microwave resonator.

@article{Wolf2003TestsOL,
  title={Tests of Lorentz invariance using a microwave resonator.},
  author={Peter Wolf and Sebastien Bize and Andr{\'e} Clairon and Andre Nicholas Luiten and Giorgio Santarelli and Michael E. Tobar},
  journal={Physical review letters},
  year={2003},
  volume={90 6},
  pages={
          060402
        }
}
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 delta-beta + 1/2 = (1.5+/-4.2) x 10(-9) and beta-alpha - 1… 

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