New Limits on the Drift of Fundamental Constants from Laboratory Measurements
Résumé
We have remeasured the absolute 1S-2S transition frequency nuH in atomic hydrogen. A comparison with the result of the previous measurement performed in 1999 sets a limit of (-29±57) Hz for the drift of nuH with respect to the ground state hyperfine splitting nuCs in 133Cs. Combining this result with the recently published optical transition frequency in 199Hg+ against nuCs and a microwave 87Rb and 133Cs clock comparison, we deduce separate limits on alpha˙/alpha=(-0.9±2.9)×10-15 yr-1 and the fractional time variation of the ratio of Rb and Cs nuclear magnetic moments muRb/muCs equal to (-0.5±1.7)×10-15 yr-1. The latter provides information on the temporal behavior of the constant of strong interaction.
Domaines
Astrophysique [astro-ph]
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