{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"15eddf37e02ad6fcf634b6f807f8ed7a1612cdab54e2ca315f5069e34ba8f186","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["9d9c9f8a9719b8f5814b204abc221b30f833a82d178588388d0b01b9bf4921df","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"a18958cf37cb0062e8fe1eac3736df859a4993262eb6d32f4037f76b396e3adc","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":"2","parents":[],"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 $10^{-14} \\text{ to } 10^{-6}\\,\\mathrm{eV}$ and gluon coupling producing an oscillating $d_n \\sim 10^{-34}\\,e\\,\\mathrm{cm}$ 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":"9d9c9f8a9719b8f5814b204abc221b30f833a82d178588388d0b01b9bf4921df","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"07ffba5c9f51deb52007248ce37c5bd9dda8325d6d42b4e25e0477cf6a8d40b8","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"5b46c8386a36284a949163b53edfd6900f20899c86f4c823b8017eb989f7c78a","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"dzsA024bDral51LC-Wty8S91nuSWGeVuqZNGAbYppldG4CH7Hi35J9Qmb6CaAhenPKFXr4Q03RZBmFMWKgveBw"},"schema":"pubphys.envelope/1"},"record_hash":"07ffba5c9f51deb52007248ce37c5bd9dda8325d6d42b4e25e0477cf6a8d40b8","leaf_index":2286}