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
        }
}
We report on a new test of Lorentz invariance performed by comparing the resonance frequencies of two orthogonal cryogenic optical resonators subject to Earth's rotation over approximately 1 yr. For a possible anisotropy of the speed of light c, we obtain Delta(theta)c/c(0)=(2.6+/-1.7)x10(-15). Within the Robertson-Mansouri-Sexl (RMS) test theory, this implies an isotropy violation parameter beta-delta-1 / 2=(-2.2+/-1.5)x10(-9), about 3 times lower than the best previous result. Within the… Expand
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