On the calculation of the gravitational torque in measuring G by a dynamic method

Cheng-Gang Shao, Liang-Cheng Tu, Shan-Qing Yang, and Jun Luo1


The authors of the paper [1], Grav. Cosmol. 16, 323 (2010), presented two methodologies for calculating the gravitational torque while measuring the gravitational constant G by a dynamic method. We have checked their calculations and found an evident error which directly leads a wrong conclusion in the paper. Besides, their discussion on the advantage of the methodology includes a logical contradiction.


  1. V. M. Shakhparonov, O. V. Karagioz, and V. P. Izmailov, Grav. Cosmol. 16, 323 (2010).
  2. K. Kuroda, Phys. Rev. Lett. 75, 2796 (1995).
  3. R. D. Newman and M. K. Bantel, Meas. Sci. Technol. 10, 445 (1999).
  4. C. C. Speake, T. J. Quinn, R. S. Davis and S. J. Richman, Meas. Sci. Technol. 10, 430 (1999).
  5. J. Luo, Q. Liu, L. C. Tu, C. G. Shao, L. X. Liu, S. Q.Yang, Q. Li, and Y. T. Zhang, Phys. Rev. Lett. 102, 240801 (2009).
  6. E. G. Adelberger, N. A. Collins and C. D. Hoyle, Class. Quantum Grav. 23, 125 (2006).
  7. Y. T. Chen and A. H. Cook, Gravitational Experiments in the Laboratory (Cambridge University Press, 1993).
  8. L. C. Tu, Q. Li, Q. L.Wang, C. G. Shao, S. Q.Yang, L. X. Liu, Q. Liu, and J. Luo, Phys. Rev. D 82, 022001 (2010).
  9. J. Luo, Z. K. Hu, and H. Hsu, Rev. Sci. Instrum. 71, 1524 (2000).
  10. Z. K. Hu, J. Luo, and H. Hsu, Phys. Lett. A 264, 112 (1999).
  11. S. Q. Yang, L. C. Tu, C. G. Shao, Q. Li, Q. L. Wang, Z. B. Zhou and J. Luo, Phys. Rev. D 80, 122005 (2009).
  12. Q. Li, L. X. Liu, L. C. Tu, C. G. Shao and J. Luo, Chin. Phys. Lett. 27, 070401 (2010).
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