{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"577b76be8559797ef7d13019cc682519dd5447d50f8238820c9649bc6854dde4","created":"2026-10-03T07:18:02Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["4c2ca4a5c1c2d8f56aa842204084b542b750b4b5cc286d3f9ffd4bd22574f5ad","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"b8af17be9ba2163532918d319a59a8bdca6fbe1c0934f358101b611e85b185c5","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"cosmo.galaxy-scale-dark-matter.rar-intrinsic-scatter","kind":"well-posed","literature_status":"contested","n":"1","parents":[{"note":"","parent_revision":"4c2ca4a5c1c2d8f56aa842204084b542b750b4b5cc286d3f9ffd4bd22574f5ad","relation":"special_case"}],"plain":"If the universal curve has no spread at all beyond measurement errors, that would favor modified gravity. If it has a real spread that depends on galaxy history, that would favor dark matter.","posed_since":"","precise":"Measure the intrinsic scatter (in dex) of $\\log g_{\\mathrm{obs}}$ at fixed $\\log g_{\\mathrm{bar}}$, after marginalizing over distance, inclination and stellar mass-to-light ratio, for rotation curves and for weak lensing out to $\\sim 1\\ \\mathrm{Mpc}$. MOND predicts zero scatter and no residual dependence on galaxy properties; LCDM predicts nonzero scatter tied to halo concentration and formation history. An answer is the scatter with uncertainty below $0.02\\ \\mathrm{dex}$ and the residual correlations.","problem_ref":null,"references":"","settled_by":"A homogeneous rotation-curve sample with independent distances plus stacked galaxy-galaxy weak lensing at low acceleration.","status_note":"2024 weak-lensing analyses reported the relation and flat implied rotation curves extending to several hundred kpc (moderate confidence).","title":"What is the intrinsic scatter of the radial acceleration relation?","topic_ref":"2930612cbb6d87e36edabf652b28a9ef16183bca601f4a29730a1ed3093544bf"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"7cf9804db8e91ae920de00c4a1b6afb13559b0d49954088e02e179aebe266914","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"06bbb77c3427ce9471fecb13aad66ae50fcb5a2a770b4a439cd3c49fb3f5dbb2","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"HvmYXEh3b-f2Oe8C-spVoueTnuxkucM86rOxi8q5YwTy39mLnEddhaTdQiAVgrk5hsq1nwcCz_wOhzR5LzLkBw"},"schema":"pubphys.envelope/1"},"record_hash":"7cf9804db8e91ae920de00c4a1b6afb13559b0d49954088e02e179aebe266914","leaf_index":1250}