Improved constraints on non-Newtonian forces at 10 microns

摘要: 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 can be parameterized as Yukawa-type correction to the Newtonian potential of $\ensuremath{\alpha}$ relative gravity and range $\ensuremath{\lambda}$. To extend search for such physics we have improved our apparatus utilizing cryogenic micro-cantilevers capable measuring attonewton forces, which now includes switchable magnetic force calibration. Our most experimental constraints on deviations from are more than 3 times stringent previously published results represent best bound $5--15\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$, with 95% confidence exclusion $|\ensuremath{\alpha}|g14,000$ $\ensuremath{\lambda}=10\text{ }\ensuremath{\mu}\mathrm{m}$.