Short-range test of the universality of gravitational constant G at the millimeter scale using a digital image sensor

K. Ninomiya, T. Akiyama, M. Hata, M. Hatori, T. Iguri, Y. Ikeda, S. Inaba, H. Kawamura, R. Kishi, H. Murakami, Y. Nakaya, H. Nishio, N. Ogawa, J. Onishi, S. Saiba, T. Sakuta, S. Tanaka, R. Tanuma, Y. Totsuka, R. TsutsuiK. Watanabe, J. Murata

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number185005
JournalClassical and Quantum Gravity
Volume34
Issue number18
DOIs
Publication statusPublished - 2017 Aug 23

Keywords

  • digital image analysis
  • gravitational constant
  • gravity experiment
  • short range test
  • torsion balance
  • weak equivalence principle

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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