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Beer Weekend

by M.G. Siegler

Searching for Shrunken Dimensions

The Economist:

One putative explanation, known as ADD after the initials of the surnames of three of its inventors, invokes extra dimensions to account for the difference. Gravity, this theory suggests, “spreads out” through these dimensions, dissipating its strength. The other forces, by contrast, are confined to the familiar three spatial ones, plus time. ADD conceives of the extra dimensions as being shrunken, compared with the familiar ones. But it suggests they should be detectable in the gravitational interactions of objects less than 100 microns apart. Measuring that is tricky, but Dr Geraci’s apparatus is one way of doing so.



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