Composition Dependent Interactions Weaker Than Gravity      (Physics)
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{'SignBlockName': 'Richard Isaacson', 'PO_EMAI': None, 'PO_PHON': None}
Gravity is by far the weakest of the known fundamental                     interactions.  Could there exist new interactions much weaker                   than gravity that have remained undetected because of the                       extraordinarily delicate effects they produce?  The Seattle                     group will develop a sensitive instrument based on a highly                     symmetrical, rotation torsion balance to search for feeble                      forces that are not exactly proportional to mass, as is                         gravity, but depend slightly on the substance (e.g. on the                      number of neutrons, protons, quarks, or electrons).  This will                  allow them to "see" interactions approximately 60 times weaker                  than their present detection limit, which is the best existing                  constraint on composition dependent forces.
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[{'Code': '1243', 'Text': 'Gravity Exp. & Data Analysis'}, {'Code': '9120', 'Text': 'CROSS-DIRECTORATE PROGRAMS'}]
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