Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Classical and quantum gravity, 2017-09, Vol.34 (18), p.185005

Ort / Verlag

IOP Publishing

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 G~Al−W/G~Cu−W−1 and G~Cu−W/GN−1 were (0.9±1.1sta±4.8sys)×10−2 and (0.2±0.9sta±2.1sys)×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 ηAl−Cu(r∼1cm)=(0.9±1.1sta±4.9sys)×10−2 at the shortest range of around 1 cm was also obtained.