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arXiv · 0802.2350

Improved constraints on non-Newtonian forces at 10 microns

Andrew A. Geraci·Sylvia J. Smullin·David M. Weld·John Chiaverini·Aharon Kapitulnik
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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 $α$ 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.

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Andrew A. Geraci, Sylvia J. Smullin, David M. Weld, John Chiaverini, Aharon Kapitulnik. 2008-06-30. Improved constraints on non-Newtonian forces at 10 microns. https://doi.org/10.1103/physrevd.78.022002

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