Improved constraints on non-Newtonian forces at 10 microns

Andrew A. Geraci, Sylvia J. Smullin, David M. Weld, John Chiaverini, Aharon Kapitulnik

Research output: Contribution to journalArticlepeer-review

172 Scopus citations


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 5-15μm, with a 95% confidence exclusion of forces with |α|>14,000 at λ=10μm.

Original languageEnglish (US)
Article number022002
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number2
StatePublished - Jul 10 2008

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Improved constraints on non-Newtonian forces at 10 microns'. Together they form a unique fingerprint.

Cite this