Tests of the gravitational inverse-square law below the dark-energy length scale.
We conducted three torsion-balance experiments to test the gravitational inverse-square law at separations between 9.53 mm and 55 microm, probing distances less than the dark-energy length scale lambda(d)=[4 -root](variant Planck's over 2pic/rho(d) approximately 85 microm. We find with 95% confidence that the inverse-square law holds (|alpha|<or=1) down to a length scale lambda=56 microm and that an extra dimension must have a size R<or=44 microm.
Kapner
D J
DJ
Center for Experimental Nuclear Physics and Astrophysics, Box 354290, University of Washington, Seattle, Washington 98195-4290, USA.
Cook
T S
TS
Adelberger
E G
EG
Gundlach
J H
JH
Heckel
B R
BR
Hoyle
C D
CD
Swanson
H E
HE