Null gravitational redshift experiment with nonidentical atomic clocks

Details Null gravitational redshift experiment with nonidentical atomic clocks Null gravitational redshift experiment with nonidentical atomic clocks

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phrvd..51..319g&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 51, Issue 2, 15 January 1995, pp.319-323

Physics

21

Experimental Tests Of Gravitational Theories, Determination Of Fundamental Constants

Scientific paper

A test of the position invariance (LPI) principle embodied in the Einstein equivalence principle (EEP) has been performed via a ``null'' gravitational redshift experiment. The rate of a magnesium frequency standard has been compared with that of a cesium reference clock searching for a dependence on the solar gravitational potential during a period of 430 days. Because of the Earth's orbital motion during the experiment, the solar potential in the laboratory had a peak-to-peak variation of 6.7×10-10, allowing us to set an upper limit on the relative frequency variation of 7×10-4 of the external potential. This result represents an improvement of more than one order of magnitude with respect to previous analogous tests of the LPI principle and leads also to a more rigorous limit on a possible spatial variation of the fine-structure constant..

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