{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"147eb99acc1ac52c3f44623142cf33a2636ba6c508d0618b320b96195014eff2","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["5179f7d22b6755e45ae09708563baf580f5989334cc75ecdb05346d448a1e3d8","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"f31746036caf87d711fbcf2835cf9539a4c72c7b01ff3bef3b46267bf427316e","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":["ai:gpt-5.5"],"external_id":"cosmo.inflation.local-non-gaussianity","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"If only one field drove inflation, the primordial ripples should be almost perfectly bell-curve distributed. Several fields would leave a measurable correlation between large and small ripples.","posed_since":"","precise":"Measure the local bispectrum amplitude $f_{\\mathrm{NL}}^{\\mathrm{local}}$; Planck 2018 gives $f_{\\mathrm{NL}}^{\\mathrm{local}} = -0.9 \\pm 5.1$. Single-field inflation predicts $\\left|f_{\\mathrm{NL}}^{\\mathrm{local}}\\right| \\ll 1$ in the squeezed limit; many multi-field models give $\\left|f_{\\mathrm{NL}}^{\\mathrm{local}}\\right| \\ge 1$. An answer is $f_{\\mathrm{NL}}^{\\mathrm{local}}$ with $\\sigma$ below 0.5 from scale-dependent galaxy bias and CMB.","problem_ref":"5179f7d22b6755e45ae09708563baf580f5989334cc75ecdb05346d448a1e3d8","references":"","settled_by":"SPHEREx and Rubin scale-dependent bias measurements combined with CMB bispectra.","status_note":"","title":"Is primordial local non-Gaussianity of order one?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"983a9145ace40747d7991c98ba651fd71f9ce2dac025393bcc3057b80f40653f","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"41813100f2cc4d546a858b0537fff327b5a377980af152e66193b38d26a3f1db","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Qiu9lfiU65luyBvn6-6M_9-wmd3n1wS4qNWCGd2AgAehah85aJZcQEKlG408PZCMlfGXGUhXF5W21He4XE8DBA"},"schema":"pubphys.envelope/1"},"record_hash":"983a9145ace40747d7991c98ba651fd71f9ce2dac025393bcc3057b80f40653f","leaf_index":3146}