17 November 2006

No Extra Dimensions Found (Yet)

The Washington group reports new data on possible modifications of the inverse square law for gravity. Using a torsion balance they tested Newton's gravity law between 9.53mm and 55μm and found no deviation. With the present knowledge for dark energy density, which gives a dark energy length scale of 56μm, the size of extra dimensions must be smaller than 44μm.

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