{"paper":{"title":"Measuring $\\alpha$ in the Early Universe: CMB Polarization, Reionization and the Fisher Matrix Analysis","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Melchiorri (Oxford, Cambridge, CAUP), C.J.A.P. Martins (CAUP, G. Rocha (Cambridge, IAP), P.P. Avelino (Porto), P.T.P. Viana (CAUP), R. Bean (Princeton), Roma), R. Trotta (Geneva)","submitted_at":"2003-09-08T16:46:31Z","abstract_excerpt":"We present a detailed analysis of present and future Cosmic Microwave Background constraints of the value of the fine-structure constant, $\\alpha$. We carry out a more detailed analysis of the WMAP first-year data, deriving state-of-the-art constraints on $\\alpha$ and discussing various other issues, such as the possible hints for the running of the spectral index. We find, at 95% C.L. that $0.95 < \\alpha_{\\text{dec}} / \\alpha_0 < 1.02$. Setting $dn_S /dlnk=0$, yields $0.94< \\alpha_{\\text{dec}} / \\alpha_0 < 1.01$ as previously reported. We find that a lower value of $\\alpha / \\alpha_0$ makes a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0309211","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/0309211/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"}