Improved Limits on Variation of the Fine Structure Constant and Violation of Local Position Invariance

Title:
Improved Limits on Variation of the Fine Structure Constant and Violation of Local Position Invariance
Authors:
Fortier, T. M.; Ashby, N.; Bergquist, J. C.; Delaney, M. J.; Diddams, S. A.; Heavner, T. P.; Hollberg, L.; Itano, W. M.; Jefferts, Steven R.; Levi, F.; Lorini, L.; Oskay, W. H.; Parker, T. E.; Shirley, J.; Kim, K.
Abstract:
We report tests of local position invariance and the variation of fundamental constants from measurements of the frequency ratio of the 282-nm Hg+199 optical clock transition to the ground state hyperfine splitting in Cs133. Analysis of the frequency ratio of the two clocks, extending over 6 yr at NIST, is used to place a limit on its fractional variation of <5.8×10−6 per change in normalized solar gravitational potential. The same frequency ratio is also used to obtain 20-fold improvement over previous limits on the fractional variation of the fine structure constant of |α˙α|<1.3×10−16  yr−1, assuming invariance of other fundamental constants. Comparisons of our results with those previously reported for the absolute optical frequency measurements in H and Yb+171 vs other Cs133 standards yield a coupled constraint of −1.5×10−15<α˙/α<0.4×10−15  yr−1 and −2.7×10−15<ddtlnμCsμB<8.6×10−15  yr−1.
Citation:
Fortier, T. M., N. Ashby, J. C. Bergquist, M. J. Delaney, et al. 2007. "Improved Limits on Variation of the Fine Structure Constant and Violation of Local Position Invariance." Physical Review Letters 98.
Publisher:
American Physical Society
DATE ISSUED:
2007
Department:
Physics and Astronomy
Type:
article
PUBLISHED VERSION:
10.1103/PhysRevLett.98.070801
PERMANENT LINK:
http://hdl.handle.net/11282/310223

Full metadata record

DC FieldValue Language
dc.contributor.authorFortier, T. M.en_US
dc.contributor.authorAshby, N.en_US
dc.contributor.authorBergquist, J. C.en_US
dc.contributor.authorDelaney, M. J.en_US
dc.contributor.authorDiddams, S. A.en_US
dc.contributor.authorHeavner, T. P.en_US
dc.contributor.authorHollberg, L.en_US
dc.contributor.authorItano, W. M.en_US
dc.contributor.authorJefferts, Steven R.en_US
dc.contributor.authorLevi, F.en_US
dc.contributor.authorLorini, L.en_US
dc.contributor.authorOskay, W. H.en_US
dc.contributor.authorParker, T. E.en_US
dc.contributor.authorShirley, J.en_US
dc.contributor.authorKim, K.en_US
dc.date.accessioned2013-12-23T16:28:23Zen
dc.date.available2013-12-23T16:28:23Zen
dc.date.issued2007en
dc.identifier.citationFortier, T. M., N. Ashby, J. C. Bergquist, M. J. Delaney, et al. 2007. "Improved Limits on Variation of the Fine Structure Constant and Violation of Local Position Invariance." Physical Review Letters 98.en_US
dc.identifier.issn0031-9007en_US
dc.identifier.urihttp://hdl.handle.net/11282/310223en
dc.description.abstractWe report tests of local position invariance and the variation of fundamental constants from measurements of the frequency ratio of the 282-nm Hg+199 optical clock transition to the ground state hyperfine splitting in Cs133. Analysis of the frequency ratio of the two clocks, extending over 6 yr at NIST, is used to place a limit on its fractional variation of <5.8×10−6 per change in normalized solar gravitational potential. The same frequency ratio is also used to obtain 20-fold improvement over previous limits on the fractional variation of the fine structure constant of |α˙α|<1.3×10−16  yr−1, assuming invariance of other fundamental constants. Comparisons of our results with those previously reported for the absolute optical frequency measurements in H and Yb+171 vs other Cs133 standards yield a coupled constraint of −1.5×10−15<α˙/α<0.4×10−15  yr−1 and −2.7×10−15<ddtlnμCsμB<8.6×10−15  yr−1.en_US
dc.publisherAmerican Physical Societyen_US
dc.identifier.doi10.1103/PhysRevLett.98.070801en
dc.subject.departmentPhysics and Astronomyen_US
dc.titleImproved Limits on Variation of the Fine Structure Constant and Violation of Local Position Invarianceen_US
dc.typearticleen_US
dc.identifier.journalPhysical Review Lettersen_US
dc.identifier.volume98en_US
All Items in The Five Colleges of Ohio Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.