arXiv:2002.11761hep-ex
New Test of the Gravitational $1/r^2$ Law at Separations down to 52 $μ$m
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Abstract
We tested the gravitational $1/r^2$ law using a stationary torsion-balance detector and a rotating attractor containing test bodies with both 18-fold and 120-fold azimuthal symmetries that simultaneously tests the $1/r^2$ law at two different length scales. We took data at detector-attractor separations between $52~μ$m and 3.0 mm. Newtonian gravity gave an excellent fit to our data, limiting with 95\% confidence any gravitational-strength Yukawa interactions to ranges $< 38.6~μ$m.
For those of us who don't have APS access, there's the preprint: https://arxiv.org/abs/2002.11761
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