@article{98dd57183fbc47619014f8fd8fe09202,
title = "Short-range test of the universality of gravitational constant G at the millimeter scale using a digital image sensor",
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 and were and , 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 at the shortest range of around 1 cm was also obtained.",
keywords = "digital image analysis, gravitational constant, gravity experiment, short range test, torsion balance, weak equivalence principle",
author = "K. Ninomiya and T. Akiyama and M. Hata and M. Hatori and T. Iguri and Y. Ikeda and S. Inaba and H. Kawamura and R. Kishi and H. Murakami and Y. Nakaya and H. Nishio and N. Ogawa and J. Onishi and S. Saiba and T. Sakuta and S. Tanaka and R. Tanuma and Y. Totsuka and R. Tsutsui and K. Watanabe and J. Murata",
note = "Funding Information: This study is supported by a Grant-in-Aid for Exploratory Research (grant numbers 18654048 and 20654024), and Rikkyo SFR (Rikkyo University Special Fund for Research), MEXT-Supported Program for the Strategic Research Foundation at Private Universities, 2014–2017 (S1411024). Parts of this study were performed as undergraduate student experiments. The authors thank Y Miyano, M Takahashi, T Tsuneno, T Amanuma, S Danbara, T Iino, S Mizuno, Y Araki, T Ohmori, Y Sakurai, S Yamaoka and Y Sekiguchi for their important inputs in this study. Publisher Copyright: {\textcopyright} 2017 IOP Publishing Ltd.",
year = "2017",
month = aug,
day = "23",
doi = "10.1088/1361-6382/aa837f",
language = "English",
volume = "34",
journal = "Classical and Quantum Gravity",
issn = "0264-9381",
publisher = "IOP Publishing Ltd.",
number = "18",
}