Experimental test of equivalence principle with polarized masses

Details Experimental test of equivalence principle with polarized masses Experimental test of equivalence principle with polarized masses

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvd..42..977r&link_type=abstract

Physical Review D (Particles and Fields), Volume 42, Issue 4, 15 August 1990, pp.977-991

Physics

30

Scientific paper

A torsion pendulum having masses with ~1022 and ~1023 polarized electrons is used to search for an anomalous spin interaction of macroscopic range. Competition from magnetic forces is reduced by using Dy-Fe masses (which exhibit orbital compensation of the electron intrinsic spin), combined with light magnetic shielding, so that the sensitivity is better than one-tenth of a percent of the gravitational force. Fluctuations set the overall experimental limit at about 8 times this level. Interpretation of our null result sets limits on electron spin interactions and on moments which are not of electromagnetic origin. In terms of a standard dipole-dipole form the result is (1.6+/-6.9)×10-12 of the interaction strength between the magnetic moments of the electrons. Comparisons are made with theoretical predictions for very light exchange particles.

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