Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale

Abstract
We conducted three torsion-balance experiments to test the gravitational inverse-square law at separations between 9.53 mm and 55μm, probing distances less than the dark-energy length scale λd=c/ρd485μm. We find with 95% confidence that the inverse-square law holds (|α|1) down to a length scale λ=56μm and that an extra dimension must have a size R44μm.
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