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- W3106280064 abstract "The composition dependence of gravitational constant $G$ is measured at the millimeter scale to test the weak equivalence principle, which may be violated at short range through new Yukawa interactions such as the dilaton exchange force. A torsion balance on a turning table with two identical tungsten targets surrounded by two different attractor materials (copper and aluminum) is used to measure gravitational torque by means of digital measurements of a position sensor. Values of the ratios $tilde{G}_{Al-W}/tilde{G}_{Cu-W} -1$ and $tilde{G}_{Cu-W}/G_{N} -1$ were $(0.9 pm 1.1_{mathrm{sta}} pm 4.8_{mathrm{sys}}) times 10^{-2}$ and $ (0.2 pm 0.9_{mathrm{sta}} pm 2.1_{mathrm{sys}}) times 10^{-2}$ , respectively; these were obtained at a center to center separation of 1.7 cm and surface to surface separation of 4.5 mm between target and attractor, which is consistent with the universality of $G$. A weak equivalence principle (WEP) violation parameter of $eta_{Al-Cu}(rsim 1: mathrm{cm})=(0.9 pm 1.1_{mathrm{sta}} pm 4.9_{mathrm{sys}}) times 10^{-2} $ at the shortest range of around 1 cm was also obtained." @default.
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- W3106280064 date "2017-08-23" @default.
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- W3106280064 title "Short-range test of the universality of gravitational constant <i>G</i> at the millimeter scale using a digital image sensor" @default.
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