Precision Test of the Equivalence Principle

Details Precision Test of the Equivalence Principle Precision Test of the Equivalence Principle

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..apr.h7003g&link_type=abstract

American Physical Society, 2008 APS April Meeting and HEDP/HEDLA Meeting, April 11-15, 2008, abstract #H7.003

Physics

Scientific paper

We used a torsion balance instrument installed on a continuously rotating turntable to measure the acceleration difference of beryllium and titanium test bodies towards sources at a variety of distances. Our result δaN,Be-Ti = (0.6±3.1)x10-15 m/s^2 improves previous limits on equivalence-principle violations with ranges from 1 m to ∞ by nearly an order of magnitude. The Eötvös parameter is ηEarth,Be-Ti = (0.3±1.8)x10-13. By analyzing our data for accelerations towards the center of the Milky Way we find equal attractions of Be and Ti towards galactic dark matter, yielding ηDM,Be-Ti = (-4±7)x10-5. Space-fixed differential accelerations in any direction are limited to less than 8.8 x 10-15 m/s^2 with 95% confidence.

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