{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"756039a3ac8dbb5de0c7725cb44cd5961c490e4e472fd43a3b0ae7447efd41ba","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["2965f29fa64a3f3769c7a0f0c84b892c1aaf6f91365c067552a5be974ff72642","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"d9a6ab4154e2e403df590524a6136f3adc649c816178ca6a07aaccb5e4de5e24","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cosmo.dark-matter-identity.qcd-axion","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"The axion is a very light hypothetical particle invented to explain why the strong force does not distinguish past from future in a certain way, and it could also be dark matter. Experiments try to convert axions into microwave photons inside strong magnets.","posed_since":"1983","precise":"Does a QCD axion with mass $m_a$ in roughly $10^{-6} \\text{ to } 10^{-3}\\, \\mathrm{eV}$ and photon coupling $g_a-\\gamma$ on the KSVZ or DFSZ model bands constitute $\\Omega_c$? An answer is a haloscope or helioscope detection at a fixed frequency $\\nu = m_a c^2 / h$ with the predicted coupling, or exclusion of the DFSZ band over the mass range favored by post-inflationary production.","problem_ref":"2965f29fa64a3f3769c7a0f0c84b892c1aaf6f91365c067552a5be974ff72642","references":"","settled_by":"Resonant-cavity, dielectric or plasma haloscopes scanning the $10^{-6}$ to $10^{-3}$ eV mass range at DFSZ sensitivity.","status_note":"As of 2025 haloscopes such as ADMX reach DFSZ sensitivity only over narrow mass intervals near a few micro-eV (moderate confidence on the exact range).","title":"Is dark matter the QCD axion?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"2b5953db73083df7ce9b72f27a2cae5d285d579b0beae9a390f1be1da8ce6474","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"99d9d9143e23c26ff82a36394128e50605758bcda47d3ee783750fd9815faca1","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"175zsP_d7_7tlgHLbAfzIeeXvDZ6pYKPUz6SR9yiCK1CoJVXVaIm6XO2ClFROy_-5WXq1_qC1F-LtBlTAKBECw"},"schema":"pubphys.envelope/1"},"record_hash":"2b5953db73083df7ce9b72f27a2cae5d285d579b0beae9a390f1be1da8ce6474","leaf_index":3130}