{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"ffc4491b8875c604cb04adb7fd965c1cf597bb7377a787b17a52d7989da652b4","created":"2026-10-03T07:18:02Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1f97e7d5d05d4bb015086aa4c01c1e0749505a662f74057449a7e83c72155e7b","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"cosmo.structure-growth-neutrino-mass.neutrino-mass-sum","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Cosmology can weigh neutrinos because heavier neutrinos smooth out the clumping of matter. The task is to measure the total mass with cosmological data, not just bound it.","posed_since":"","precise":"Measure sum $m_\\nu$ with uncertainty $\\sigma \\le 0.015\\,\\mathrm{eV}$ from CMB lensing, galaxy clustering and BAO, with the reionization optical depth $\\tau$ measured independently to $\\sigma(\\tau) \\sim 0.002$. An answer is a value that also discriminates normal from inverted ordering.","problem_ref":null,"references":"","settled_by":"Simons Observatory and LiteBIRD-era CMB lensing and large-scale polarization combined with final DESI and Euclid.","status_note":"","title":"Cosmological measurement of the neutrino mass sum to 0.015 eV","topic_ref":"7f5d118cb8a64bd99639aa18f99daf7cb794d9366c6bec82eeea82eef99d0ccd"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"94313da7e8a70f2dfcbd2df55b192658eabb73eada592c1d028b70f2cfe6a630","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"92d4f5cd4f6606aec0cf3ff97fa478f81783d48146e27fedbaf4b1fed22fa6d2","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"x4CqbGp2s9R85zn4uit1NzAdDq7o1tbRYTs8jJ4j7RNBkEZeWzGifXA-omK_5EvzCCTFf-OSakD_qATsYL4BAw"},"schema":"pubphys.envelope/1"},"record_hash":"94313da7e8a70f2dfcbd2df55b192658eabb73eada592c1d028b70f2cfe6a630","leaf_index":1280}