Improved Tests of Local Position Invariance Using 87Rb and 133Cs Fountains

被引：98
作者：
Guena, J. [1 ]
Abgrall, M. [1 ]
Rovera, D. [1 ]
Rosenbusch, P. [1 ]
Tobar, M. E. [2 ]
Laurent, Ph [1 ]
Clairon, A. [1 ]
Bize, S. [1 ]
机构：
[1] UPMC, CNRS, Observ Paris, LNE SYRTE, F-75014 Paris, France
[2] Univ Western Australia, Sch Phys, Crawley, Australia
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 08期
关键词：
FUNDAMENTAL CONSTANTS; DECIMAL PLACE; METROLOGY; CLOCKS; SEARCH; SPACE; LINK;
D O I：
10.1103/PhysRevLett.109.080801
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report tests of local position invariance based on measurements of the ratio of the ground state hyperfine frequencies of Cs-133 and Rb-87 in laser-cooled atomic fountain clocks. Measurements extending over 14 years set a stringent limit to a possible variation with time of this ratio: d ln(nu(Rb)/nu(Cs))/dt = (-1.39 +/- 0.91) x 10(-16) yr(-1). This improves by a factor of 7.7 over our previous report [H. Marion et al., Phys. Rev. Lett. 90, 150801 (2003)]. Our measurements also set the first limit to a fractional variation of the Rb/Cs frequency ratio with gravitational potential at the level of c(2)d ln(nu(Rb)/nu(Cs))/dU = (0.11 +/- 1.04) x 10(-6), providing a new stringent differential redshift test. The above limits equivalently apply to the fractional variation of the quantity alpha(-0.49)(g(Rb)/g(Cs)), which involves the fine-structure constant alpha and the ratio of the nuclear g-factors of the two alkalis. The link with variations of the light quark mass is also presented together with a global analysis combining other available highly accurate clock comparisons.
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页数：5
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