Gravity Normal At Small Scales.

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ohwilleke
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Main Question or Discussion Point

A study of gravity at the 6-20 micrometer scale has found it to behave normally and experimentally constrained the scale of any small scale deviation from the Newtonian expectation.

http://www.arxiv.org/abs/hep-ph/0508204

Hat tip to Motl for noting the paper.
 

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Chronos
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Isn't it amazing how difficult it is to test gravity at not-so-extreme limits? I've always thought so. 6-20 micrometers is enormous compared to most scales at which we test fundamental interactions. Kinda reminds me of the Planck mass.
 
Haelfix
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If you want to learn more about these sorts of experiments *and they are really cool IMO* check out this page

http://www.npl.washington.edu/eotwash/

and for instance a review article on various ways of doing this experiment

http://www.npl.washington.edu/eotwash/pdf/review.pdf [Broken]

Basically all these experiments are like the famous Cavendish experiment in one shape or another. The more modern versions now use casimir forces to measure the deviation.
 
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