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superstrings


sstr.jpgFrom the Journal Nature (requires login), a paper on how new gravity measurements constrain string theory forces:

[...] we report a search for gravitational-strength forces using planar oscillators separated by a gap of 108 Ám. No new forces are observed, ruling out a substantial portion of the previously allowed parameter space for the strange and gluon moduli forces, and setting a new upper limit on the range of the string dilaton and radion forces.
Here's the summary in plain English from Scientific American:
The first measurement of the gravitational constant came more than 100 years later, but testing gravity over very short distances has proved difficult. Now scientists have examined the gravitational attraction between two objects just a tenth of a millimeter apart--the smallest gap yet for such trials. The findings, published today in the journal Nature, set upper limits for some of the forces predicted by string theory.

Categories: science
Posted by diego on February 28 2003 at 11:48 AM

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