{"paper":{"title":"Constraints on Neutrino Degeneracy from the Cosmic Microwave Background and Primordial Nucleosynthesis","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"G. J. Mathews, M. Orito, T. Kajino, Y. Wang","submitted_at":"2002-03-20T20:58:53Z","abstract_excerpt":"We reanalyze the cosmological constraints on the existence of a net universal lepton asymmetry and neutrino degeneracy based upon the latest high resolution CMB sky maps from BOOMERANG, DASI, and MAXIMA-1. We generate likelihood functions by marginalizing over $(\\omegab h^2,\\xinumt, \\xinue, \\Omega_\\Lambda,h,n)$ plus the calibaration uncertainties. We consider flat $\\Omega_M + \\Omega_\\Lambda = 1$ cosmological models with two identical degenerate neutrino species, $\\xinumt \\equiv \\vert \\xinum \\vert = \\vert \\xinut \\vert$ and a small $\\xinue$. We assign weak top-hat priors on the electron-neutrino"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0203352","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0203352/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}