Improved limits on variation of the fine structure constant and violation of Local Position Invariance

T. M. Fortier, N. Ashby, J. C. Bergquist, M. J. Delaney, S. A. Diddams, T. P. Heavner, L. Hollberg, W. M. Itano, S. R. Jefferts, K. Kim, W. H. Oskay, T. E. Parker, J. Shirley, J. E. Stalnaker, F. Levi, L. Lorini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report tests of Local Position Invariance (LPI) and constancy of fundamental constants from measurements of the frequency ratio of the 282-nm 199Hg+ optical clock transition to the ground-state hyperfine splitting in 133Cs. Analysis of the frequency ratio, extending over six years at NIST, is used to place a limit on the fractional variation of the two clocks of less than 5.8 × 10-6 per change in normalized solar gravitational potential, and a limit on fractional variation of the fine structure constant at < 1.3 × 10-165 yr -1, assuming invariance of other fundamental constants. Comparison of our results with those previously reported for the absolute optical frequency measurements of 171Yb+ versus other 133Cs standard yields a coupled constraint of -0.04 × 10-15 < ᾱ/α < 0.46 × 10-15 yr-1 and -2.39 × 10-15 < ᾱ/α < 0.47 × l0-15 yr-1.

Original languageEnglish
Title of host publication2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum, FCS
Pages663-665
Number of pages3
DOIs
Publication statusPublished - 2007
Event2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum, FCS - Geneva, Switzerland
Duration: 2007 May 292007 Jun 1

Publication series

NameProceedings of the IEEE International Frequency Control Symposium and Exposition

Other

Other2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum, FCS
CountrySwitzerland
CityGeneva
Period07/5/2907/6/1

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Fortier, T. M., Ashby, N., Bergquist, J. C., Delaney, M. J., Diddams, S. A., Heavner, T. P., Hollberg, L., Itano, W. M., Jefferts, S. R., Kim, K., Oskay, W. H., Parker, T. E., Shirley, J., Stalnaker, J. E., Levi, F., & Lorini, L. (2007). Improved limits on variation of the fine structure constant and violation of Local Position Invariance. In 2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum, FCS (pp. 663-665). [4319157] (Proceedings of the IEEE International Frequency Control Symposium and Exposition). https://doi.org/10.1109/FREQ.2007.4319157