2008/02/29 by Andrew A. Geraci, Andrew Geraci, Sylvia J. Smullin +6 · 7 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Experimental and Theoretical Physics Studies #Quantum Electrodynamics and Casimir Effect #astro-ph #cond-mat.other #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.78.022002
published as Phys.Rev.D78:022002,2008 · 12 pages, 9 figures, accepted for publication in PRD. Minor changes, replaced and corrected Figs 4,5,8
arxiv created 2008/06/30 · openalex publication_date 2008/07/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 \ensuremathα relative to gravity and range \ensuremathλ. 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 3 times as stringent as our previously published results and represent the best bound in the range of 5--15 \ensuremathμm, with a 95% confidence exclusion of forces with |\ensuremathα|>14,000 at \ensuremathλ=10 \ensuremathμm.