title: 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 55 microm, probing distances less than the dark-energy length scale lambda(d)=[4 -root](variant Planck's over 2pic/rho(d) approximately 85 microm. We find with 95% confidence that the inverse-square law holds (|alpha|<or=1) down to a length scale lambda=56 microm and that an extra dimension must have a size R<or=44 microm.
authors.affiliation: Center for Experimental Nuclear Physics and Astrophysics, Box 354290, University of Washington, Seattle, Washington 98195-4290, USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: Kapner
authors.forename: T S
authors.initials: TS
authors.lastname: Cook
authors.forename: E G
authors.initials: EG
authors.lastname: Adelberger
authors.forename: J H
authors.initials: JH
authors.lastname: Gundlach
authors.forename: B R
authors.initials: BR
authors.lastname: Heckel
authors.forename: C D
authors.initials: CD
authors.lastname: Hoyle
authors.forename: H E
authors.initials: HE
authors.lastname: Swanson