{"paper":{"title":"Short-range test of the universality of gravitational constant $G$ at the millimeter scale using a digital image sensor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"H. Kawamura, H. Murakami, H. Nishio, J. Murata, J. Onishi, K. Ninomiya, K. Watanabe, M. Hata, M. Hatori, N. Ogawa, R. Kishi, R. Tanuma, R. Tsutsui, S. Inaba, S. Saiba, S. Tanaka, T. Akiyama, T. Iguri, T. Sakuta, Y. Ikeda, Y. Nakaya, Y. Totsuka","submitted_at":"2017-08-04T13:12:26Z","abstract_excerpt":"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}"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.01482","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}