Improved constraints on non-Newtonian forces at 10 microns
arXiv:0802.2350 · doi:10.1103/PhysRevD.78.022002
Abstract
Several recent theories suggest that light moduli or particles in "large" extra dimensions could mediate macroscopic forces exceeding gravitational strength at length scales below a millimeter. Such new forces can be parameterized as a Yukawa-type correction to the Newtonian potential of strength relative to gravity and range . To extend the search for such new physics we have improved our apparatus utilizing cryogenic micro-cantilevers capable of measuring attonewton forces, which now includes a switchable magnetic force for calibration. Our most recent experimental constraints on Yukawa-type deviations from Newtonian gravity are more than three times as stringent as our previously published results, and represent the best bound in the range of 5 - 15 microns, with a 95 percent confidence exclusion of forces with at = 10 microns.
12 pages, 9 figures, accepted for publication in PRD. Minor changes, replaced and corrected Figs 4,5,8
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