{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"bb62b82b7fdce371699b605488a8af94cf3eacaa39505469ac06833b85752c58","created":"2026-10-03T07:18:02Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"49bc63fda91c23f2ea6a258998d511d6218ee94d6c72230cc8beded1d4561499","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cosmo.dark-matter-identity.what-is-dark-matter","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"Galaxies, clusters and the cosmic microwave background all require extra unseen mass, about five times the ordinary matter. The task is to find out what that mass physically is.","posed_since":"1933","precise":"Determine the microscopic identity (mass, spin, non-gravitational couplings, production mechanism) of the non-baryonic component with $\\Omega_c h^{2} = 0.120 \\pm 0.001$ inferred from the CMB in LCDM. An answer is a candidate confirmed by a reproducible non-gravitational signal (direct, indirect or collider detection, or a compact-object census) whose abundance accounts for $\\Omega_c$.","problem_ref":null,"references":"","settled_by":"A reproducible non-gravitational detection of a candidate whose inferred cosmic abundance matches $\\Omega_{c}$.","status_note":"No candidate has been detected as of 2026; the leading searches (xenon detectors, axion haloscopes, gamma-ray telescopes, microlensing) report null or contested results.","title":"What is dark matter made 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