{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"237d874443175a202f2b99f824bc971740089645e1dd964df0be74651f29f947","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["2b14938296c8ad1e49b251b2043ee7e420f8aee7ccd506042537a27815ad01d0","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","ec960d90ef6443b334f903e8c930243add5a04b385f93a9075b8c991e11006cd"],"salt":"e67f4916c01c9fd151883fc28d8abaafc96c4979a3a49d15920d2c91f6ee7214","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":"1","parents":[{"note":"Axion making all dark matter is a sharper claim than axion existence","parent_revision":"2b14938296c8ad1e49b251b2043ee7e420f8aee7ccd506042537a27815ad01d0","relation":"special_case"},{"note":"","parent_revision":"ec960d90ef6443b334f903e8c930243add5a04b385f93a9075b8c991e11006cd","relation":"special_case"}],"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 $1e-6 \\text{ to } 1e-3\\, \\mathrm{eV}$ 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":null,"references":"","settled_by":"Resonant-cavity, dielectric or plasma haloscopes scanning the 1e-6 to 1e-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 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