Null test of Newtonian inverse-square law at submillimeter range with a dual-modulation torsion pendulum.
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 (|alpha|>or=1) must have a length scale lambda<66 microm, agreeing well with the latest result of the Eöt-wash group. Our result sets a unification energy scale of M*>or=2.8 TeV/c2 for the two compactified extra space dimensions with the same size R*<47 microm.
Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
Liang-Cheng
LC
Tu
Sheng-Guo
SG
Guan
Jun
J
Luo
Cheng-Gang
CG
Shao
Lin-Xia
LX
Liu