Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-04
Astronomy and Astrophysics
Astrophysics
13 pages, 5 figures
Scientific paper
We describe two experimental tests of the Equivalence Principle that are based on frequency measurements between precision oscillators and/or highly accurate atomic frequency standards. Based on comparisons between the hyperfine frequencies of 87Rb and 133Cs in atomic fountains, the first experiment constrains the stability of fundamental constants. The second experiment is based on a comparison between a cryogenic sapphire oscillator and a hydrogen maser. It tests Local Lorentz Invariance. In both cases, we report recent results which improve significantly over previous experiments.
Abgrall Michel
Bize Sébastien
Cacciapuoti Luigi
Clairon André
Gruenert Jan
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