Physics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrvd..65h1101b&link_type=abstract
Physical Review D, vol. 65, Issue 8, id. 081101
Physics
44
Experimental Tests Of Gravitational Theories, Time And Frequency
Scientific paper
Local position invariance (LPI) is part of the more general Einstein equivalence principle (EEP) which in turn is a foundation of Einstein's theory of general relativity. The EEP predicts a dependence of clock rates on the local gravitational potential U. LPI predicts that the gravitational shift is independent of the atomic species involved as a reference in the clock. It can thus be tested by comparing two different kinds of atomic frequency standard in the same time-varying gravitational potential U(t). In our experiment we made use of the time dependence of U(t) due to Earth's annual elliptical orbital motion. U(t)/c2 varies between +/-3.3×10-10 (c is the speed of light). Comparing a cesium atomic fountain frequency standard with a hydrogen maser for about one year allowed us to set an upper limit on a possible frequency variation of 2.1×10-5 of this amount. Compared to previous similar experiments the limit of the notional violation of LPI was reduced by a factor of more than 30.
Bauch A.
Weyers Stefan
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