2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200220Several 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 $α$ relative to gravity and range $λ$. 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 $|α| > 14,000$ at $λ$ = 10 microns.12 pages, 9 figures, accepted for publication in PRD. Minor changes, replaced and corrected Figs 4,5,8High Energy Physics - ExperimentAstrophysicsOther Condensed MatterHigh Energy Physics - Phenomenologytext