New Limits on Coupling of Fundamental Constants to Gravity Using {sup 87}Sr Optical Lattice Clocks
- JILA, National Institute of Standards and Technology and University of Colorado, Department of Physics, University of Colorado, Boulder, Colorado, 80309-0440 (United States)
The {sup 1}S{sub 0}-{sup 3}P{sub 0} clock transition frequency {nu}{sub Sr} in neutral {sup 87}Sr has been measured relative to the Cs standard by three independent laboratories in Boulder, Paris, and Tokyo over the last three years. The agreement on the 1x10{sup -15} level makes {nu}{sub Sr} the best agreed-upon optical atomic frequency. We combine periodic variations in the {sup 87}Sr clock frequency with {sup 199}Hg{sup +} and H-maser data to test local position invariance by obtaining the strongest limits to date on gravitational-coupling coefficients for the fine-structure constant {alpha}, electron-proton mass ratio {mu}, and light quark mass. Furthermore, after {sup 199}Hg{sup +}, {sup 171}Yb{sup +}, and H, we add {sup 87}Sr as the fourth optical atomic clock species to enhance constraints on yearly drifts of {alpha} and {mu}.
- OSTI ID:
- 21123847
- Journal Information:
- Physical Review Letters, Vol. 100, Issue 14; Other Information: DOI: 10.1103/PhysRevLett.100.140801; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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