{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"3f380f622e2fdae6e6df7bae2295e5717b1b0af01b84aa726599f3a53951f6fe","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["12410c9ef41276fbf05bf7ebc5e08c8a7cfe1ee5d11586a009f6cbc1545de302","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"52796a2ebc4902a2bcf84a6841f0dc166e85a90d92ed9f908bf036ed6ba91e16","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":"2","parents":[],"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 $10^{-5}$ relative by a cold-atom method, sufficient to discriminate among the discrepant macroscopic results.","problem_ref":"12410c9ef41276fbf05bf7ebc5e08c8a7cfe1ee5d11586a009f6cbc1545de302","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 ppm","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"f6015fb98863620e1a92dab8acc1c878703633da8003138f47adaf1e448a0633","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"3f465a30cd953431dc56c286f8552ccef1327575fa6fc0c5e07d0337a7e4622f","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"FETtmvX3vAHP43T7gZAh1pefDgin3JcqTthkP39k3JHSwtkc6_BgFSzF7BBIk1Q9QQQXD1MV7IcetXR25RdHDA"},"schema":"pubphys.envelope/1"},"record_hash":"f6015fb98863620e1a92dab8acc1c878703633da8003138f47adaf1e448a0633","leaf_index":2258}