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Gravitation and Cosmology

, Volume 14, Issue 4, pp 368–375 | Cite as

Status of the experiments on measurement of the Newtonian gravitational constant

  • V. K. MilyukovEmail author
  • Jun Luo
  • Chen Tao
  • A. P. Mironov
Article

Abstract

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 m3 kg−1 s−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.

PACS numbers

04.80.Cc 02.60.Cb 

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Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  • V. K. Milyukov
    • 1
    Email author
  • Jun Luo
    • 2
  • Chen Tao
    • 1
  • A. P. Mironov
    • 1
  1. 1.Sternberg Astronomical InstituteMoscow State UniversityMoscowRussia
  2. 2.Department of PhysicsHuazhong University of Science and TechnologyWuhanPeople’s Republic of China

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