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Motivated by a variety of theories that predict new effects, we tested the gravitational 1/r^2 law at separations between 10. 77 mm and 137 using two different 10-fold azimuthally symmetric torsion pendulums and rotating 10-fold symmetric attractors. Our work improves upon other experiments by up to a factor of about 100. We found no deviation from Newtonian physics at the 95% confidence level and interpret these results as constraints on extensions of the standard model that predict Yukawa or power-law forces. We set a constraint on the largest single extra dimension (assuming toroidal compactification and that one extra dimension is significantly larger than all the others) of R*~1 are ruled out at 95% confidence for >~197. Extra-dimensions scenarios stabilized by radions are restricted to unification masses M*>~3. 0TeV/c^2, regardless of the number of large extra dimensions. We also provide new constraints on power-law potentials V (r) r^-k with k between 2 and 5 and on the ₅ couplings of pseudoscalars with m<~10meV/c^2.
Hoyle et al. (Thu,) studied this question.