Abstract
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 . For a possible anisotropy of the speed of light , we obtain . Within the Robertson-Mansouri-Sexl (RMS) test theory, this implies an isotropy violation parameter , about 3 times lower than the best previous result. Within the general extension of the standard model of particle physics, we extract limits on seven parameters at accuracies down to , improving the best previous result by about 2 orders of magnitude.
- Received 27 January 2003
DOI:https://doi.org/10.1103/PhysRevLett.91.020401
©2003 American Physical Society