Improved test of Lorentz invariance in electrodynamics

@article{Wolf2004ImprovedTO,
  title={Improved test of Lorentz invariance in electrodynamics},
  author={Peter Wolf and Michael E. Tobar and Sebastien Bize and Andr{\'e} Clairon and Andre Nicholas Luiten and Giorgio Santarelli},
  journal={Physical Review D},
  year={2004},
  volume={70},
  pages={051902}
}
We report new results of a test of Lorentz invariance based on the comparison of a cryogenic sapphire microwave resonator and a hydrogen-maser. The experimental results are shown together with an extensive analysis of systematic effects. Previously, this experiment has set the most stringent constraint on Kennedy-Thorndike type violations of Lorentz invariance. In this work we present new data and interpret our results in the general Lorentz violating extension of the standard model of particle… 

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