{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"51dfc037b4dac796e787ef68cc5ef04f0e76fab2a0218ddc7ab74da72255126a","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["2965f29fa64a3f3769c7a0f0c84b892c1aaf6f91365c067552a5be974ff72642","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"76e8029d2775e1b4afff0092dc0d781516f6ce3cab0a7714d83313320530bc76","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"amo.ultralight-dm-fifth-forces.oscillating-nucleon-edm","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"Oscillating nucleon EDM tests QCD-axion dark matter below 1e-6 eV","parent_revision":"2965f29fa64a3f3769c7a0f0c84b892c1aaf6f91365c067552a5be974ff72642","relation":"special_case"}],"plain":"An axion, a proposed very light particle, would give neutrons and protons a tiny electric dipole that oscillates in time. Nuclear magnetic resonance experiments look for the resulting wobble of nuclear spins.","posed_since":"","precise":"For axion dark matter with mass $m_a$ in $1e-14 \\text{ to } 1e-6\\,\\mathrm{eV}$ and gluon coupling producing an oscillating $d_n \\sim 1e-34\\,e\\,\\mathrm{cm}$ at QCD-axion strength, determine whether an oscillating nucleon EDM or axion-nucleon gradient coupling is present at that strength, using solid-state NMR (CASPEr-type) or comagnetometers.","problem_ref":null,"references":"","settled_by":"A resonant NMR or comagnetometer search reaching the QCD-axion band over at least a decade in mass.","status_note":"","title":"Axion-induced oscillating nucleon EDM at QCD-axion strength","topic_ref":"65dd591d9a6aea57b124c4aa9efd99b0deceb1c7733b697b5b72544d315d1ba0"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"9d9c9f8a9719b8f5814b204abc221b30f833a82d178588388d0b01b9bf4921df","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"770d625fe03c2562970ddff0239f3fd4fe3bf9f7b035487501a60288d5d12655","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"6A9yugdDfo7LtFEM7pv57MbUN7ymFjjhqrY72HbuAJPPS8mpM9E6zC9MjxnJE9HbKN_NvCBvQ1VwZ-D-W6o9BA"},"schema":"pubphys.envelope/1"},"record_hash":"9d9c9f8a9719b8f5814b204abc221b30f833a82d178588388d0b01b9bf4921df","leaf_index":1585}