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    Test of the Equivalence Principle Using a Rotating Torsion Balance

    S. Schlamminger, K.-Y. Choi, T. A. Wagner, J. H. Gundlach, and E. G. Adelberger

    • Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington, 98195, USA

    Phys. Rev. Lett. 100, 041101 – Published 28 January, 2008

    DOI: https://doi.org/10.1103/PhysRevLett.100.041101

    Abstract

    We used a continuously rotating torsion balance instrument 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)×10−15  m/s2 improves limits on equivalence-principle violations with ranges from 1 m to ∞ by an order of magnitude. The Eötvös parameter is ηEarth,Be−Ti=(0.3±1.8)×10−13. 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)×10−5. Space-fixed differential accelerations in any direction are limited to less than 8.8×10−15  m/s2 with 95% confidence.

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