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Gravitational Constant: Experimental Bound on Its Time Variation

1971; American Physical Society; Volume: 26; Issue: 1 Linguagem: Inglês

10.1103/physrevlett.26.27

1092-0145

I. I. Shapiro, William B. Smith, Michael B. Ash, R. P. Ingalls, G. H. Pettengill,

Geophysics and Gravity Measurements

Analysis of radar-echo time delays, primarily between Earth and Mercury, yields an upper limit on the fractional variation of the gravitational constant of 4 parts in ${10}^{10}$ per year. Continuation of these radar measurements for five more years-even at the present level of accuracy-would allow the uncertainty to be reduced reliably to 3 parts in ${10}^{11}$ per year, a limit close to the effect predicted by some theorists.