Laboratory Limits for Temporal Variations of Fundamental Constants:. AN Update

Details Laboratory Limits for Temporal Variations of Fundamental Constants:. AN Update Laboratory Limits for Temporal Variations of Fundamental Constants:. AN Update

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mgm..conf..941p&link_type=abstract

"THE ELEVENTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation an

Astronomy and Astrophysics

Astrophysics

Scientific paper

Precision comparisons of different atomic frequency standards over a period of a few years can be used for a sensitive search for temporal variations of fundamental constants. We present recent frequency measurements of the 688 THz transition in the 171Yb+ ion. For this transition frequency a record over six years is now available, showing that a possible frequency drift relative to a cesium clock can be constrained to (-0.54 ± 0.97) Hz/yr, i.e. at the level of 2 · 10-15 per year. Combined with precision frequency measurements of an optical frequency in 199Hg+ and of the hyperfine ground state splitting in 87Rb a stringent limit on temporal variations of the fine structure constant α: d ln α/dt = (-0.26 ± 0.39) · 10-15 yr-1 and a model-dependent limit for variations of the proton-to-electron mass ratio μ in the present epoch can be derived: d ln μ/dt = (-1.2 ± 2.2) · 10-15 yr-1. We discuss these results in the context of astrophysical observations that apparently indicate changes in both of these constants over the last 5-10 billion years.

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