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Phys. Rev. D 78, 022002 (2008) [12 pages]

Improved constraints on non-Newtonian forces at 10 microns

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Andrew A. Geraci1,*, Sylvia J. Smullin1,†, David M. Weld1,‡, John Chiaverini1,§, and Aharon Kapitulnik1,2
1Department of Physics, Stanford University, Stanford, California 94305, USA
2Department of Applied Physics, Stanford University, Stanford, California 94305, USA

Received 25 February 2008; published 10 July 2008

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 3 times as stringent as our previously published results and represent the best bound in the range of 5–15  μm, with a 95% confidence exclusion of forces with |α|>14,000 at λ=10  μm.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.78.022002
DOI:
10.1103/PhysRevD.78.022002
PACS:
04.80.Cc

*aageraci@nist.gov;

Present address: National Institute of Standards and Technology, Boulder, CO 80305.

†Present address: Makani Power, Inc. Alameda, CA 94501.

‡Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139.

§Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.

 
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