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Null Test of Newtonian Inverse-Square Law at Submillimeter Range
with a Dual-Modulation Torsion Pendulum
[18.5.2007]
07-1 A null experimental test of the Newtonian inverse-square law at submillimeter range using a torsion
pendulum was presented. Under the dual modulations of both the expected signal and the gravitational
torque for calibration, our data concluded with 95% confidence that no new forces were observed and any
gravitational-strength Yukawa forces (jj  1) must have a length scale <66 m, agreeing well with
the latest result of the Eo¨t-wash group. Our result sets a unification energy scale of M  2:8 TeV=c2 for
the two compactified extra space dimensions with the same size R < 47 m.
Correction of source mass effects in the HUST-99 measurement of G [6.27.2005]

Eccentricities of the mass center from the geometric center of two cylindrical source masses used in the HUST-99 measurement of the Newtonian gravitational constant G are determined by means of an electronic balance. Considering a linear density distribution of source masses as well as the effect of the air buoyancy, our value of G should be revised to be 6.6723(9)*10-11 m3 kg-1 s-2, which is 0.036% larger than our previous published value in Phys. Rev. D 59, 042001 (1999).

 
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