{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"ae80a4f947c67a3051588c4287fcc6912879528e411bf5fc15d3c9d1946f3224","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["3358a8ece5f1ed5008265559fc402766171bd67d30216f1a1e2aa8234b7bc6a9","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"80602077133cff2f68e9fc7c9baf6328551705bca9864b23da756ff5afe25e4e","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"amo.newtonian-g.atom-interferometer-g","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"3358a8ece5f1ed5008265559fc402766171bd67d30216f1a1e2aa8234b7bc6a9","relation":"special_case"}],"plain":"Atoms in free fall make test masses that cannot twist, stretch or be magnetized like a pendulum fiber, so they could give G free of the usual suspects. Their best result so far is about ten times less precise than needed.","posed_since":"","precise":"Atom-interferometric gravity gradiometry with well-characterized source masses gave G with about 150 ppm uncertainty (Rosi et al 2014). Determine G with uncertainty below 1e-5 relative by a cold-atom method, sufficient to discriminate among the discrepant macroscopic results.","problem_ref":null,"references":"","settled_by":"A cold-atom G measurement with total uncertainty below 10 ppm and a published complete error budget.","status_note":"","title":"Atom interferometry determination of G at 10 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