Status of the experiments on measurement of the Newtonian gravitational constant
V.K. Milyukov1, Jun Luo2, Chen Tao3, A.P. Mironov4
(1) Sternberg Astronomical Institute of Moscow University, Universitetskii prospect 13, Moscow 119192, Russia
(2) Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
(3) Sternberg Astronomical Institute of Moscow University, Universitetskii prospect 13, Moscow 119192, Russia
(4) Sternberg Astronomical Institute of Moscow University, Universitetskii prospect 13, Moscow 119192, Russia
Due to the weakness of gravity, the accuracy of the Newtonian gravitational constant G is essentially below the accuracy of other fundamental constants. The current value of G, recommended by CODATA in 2006, based on all results available at the end of 2006, is G = (6.67428 ±0.00067) ×10-11 m3kg-1s-2 with a relative error of 100 ppm. The accuracy of the best experimental results is 15-40 ppm, although the scatter of the results is large enough. Therefore new experiments at a level of accuracy of 10-30 ppm are rather topical. One of the problems of improving accuracy of G is a precision measurement of the period of eigen oscillations of a torsion balance. The nonlinear behavior of the torsion balance with five degrees of freedom has been studied. It was shown that swing modes are excited by the acting environmental noise. A coupling of the swing modes to the torsional mode has been revealed. Methods of suppressing the effect of mode couplings have been considered.
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