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APS » Journals » Phys. Rev. Lett. » Volume 98 » Issue 2
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Phys. Rev. Lett. 98, 021101 (2007) [4 pages]

Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale

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D. J. Kapner*, T. S. Cook, E. G. Adelberger, J. H. Gundlach, B. R. Heckel, C. D. Hoyle, and H. E. Swanson
Center for Experimental Nuclear Physics and Astrophysics, Box 354290, University of Washington, Seattle, Washington 98195-4290, USA

Received 16 October 2006; published 8 January 2007

We conducted three torsion-balance experiments to test the gravitational inverse-square law at separations between 9.53 mm and 55  μm, probing distances less than the dark-energy length scale λd=4\ ℏc/ρd≈85  μm. We find with 95% confidence that the inverse-square law holds (|α|≤1) down to a length scale λ=56  μm and that an extra dimension must have a size R≤44  μm.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.021101
DOI:
10.1103/PhysRevLett.98.021101
PACS:
04.80.Cc, 95.36.+x

*Present address: Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA.

 
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