Schlamminger S, Choi K-Y, Wagner T A, Gundlach J H, Adelberger E G
Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA.
Phys Rev Lett. 2008 Feb 1;100(4):041101. doi: 10.1103/PhysRevLett.100.041101. Epub 2008 Jan 28.
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 Deltaa(N),(Be-Ti)=(0.6+/-3.1)x10(-15) m/s2 improves limits on equivalence-principle violations with ranges from 1 m to infinity by an order of magnitude. The Eötvös parameter is eta(Earth,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 eta(DM,Be-Ti)=(-4+/-7)x10(-5). Space-fixed differential accelerations in any direction are limited to less than 8.8x10(-15) m/s2 with 95% confidence.
我们使用了一台连续旋转的扭秤仪器，来测量铍和钛测试体在不同距离下朝向源的加速度差异。我们得到的结果Δa(N),(Be - Ti) = (0.6 ± 3.1)×10⁻¹⁵ m/s²，将等效原理违反的限制范围从1米到无穷大提高了一个数量级。厄缶参数为η(Earth,Be - Ti) = (0.3 ± 1.8)×10⁻¹³。通过分析我们朝向银河系中心加速度的数据，我们发现铍和钛对银河系暗物质的吸引力相等，得到η(DM,Be - Ti) = (-4 ± 7)×10⁻⁵。在任何方向上相对于空间固定的微分加速度在95%置信度下被限制在小于8.8×10⁻¹⁵ m/s²。
