Modern Michelson-Morley experiment using cryogenic optical resonators.

@article{Mller2003ModernME,  title={Modern Michelson-Morley experiment using cryogenic optical resonators.},  author={Holger M{\"u}ller and Sven Herrmann and Claus Braxmaier and Stephan Schiller and Achim Peters},  journal={Physical review letters},  year={2003},  volume={91 2},  pages={          020401        },  url={https://api.semanticscholar.org/CorpusID:15770750}}
A new test of Lorentz invariance is performed by comparing the resonance frequencies of two orthogonal cryogenic optical resonators subject to Earth's rotation over approximately 1 yr, improving the best previous result by about 2 orders of magnitude.

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