Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.101101
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Funding
- NSF [PHY1502156]
- ARCS Foundation Stanford Graduate Fellowship
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We present the results of a search for unknown interactions that couple to mass between an optically levitated microsphere and a gold-coated silicon cantilever. The scale and geometry of the apparatus enable a search for new forces that appear at distances below 100 mu m and which would have evaded previous searches due to screening mechanisms. The data are consistent with electrostatic backgrounds and place upper limits on the strength of new interactions at < 0.1 fN in the geometry tested. For the specific example of a chameleon interaction with an inverse power law potential, these results exclude matter couplings beta > 5.6 x 10(4) in the region of parameter space where the self-coupling Lambda greater than or similar to 5 meV and the microspheres are not fully screened.
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