{"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 of?","topic_ref":"f3bf70488fa9272a7f437ab80aa4c3a6b7aa08c428f06c436d4e947e2dc94a69"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"ec960d90ef6443b334f903e8c930243add5a04b385f93a9075b8c991e11006cd","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"3091aa34e80312624f4f2ba1f2b53279d531cde9e4e1713c4b845c08261276c8","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"XDG34z5W1CMI4sc41FFULBSYo1oueC2aE5GbLlPuOBm7QPxPjtCYcVGWJT2S-mfRdEu5J8AY_sTxzcJQ5CLgDg"},"schema":"pubphys.envelope/1"},"record_hash":"ec960d90ef6443b334f903e8c930243add5a04b385f93a9075b8c991e11006cd","leaf_index":1244}