{"paper":{"title":"A method to determine the evolution history of the mean neutral Hydrogen fraction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Abinash K. Shaw (IITKgp), Anjan K. Sarkar (IITKgp), Ilian T. Iliev (Sussex), Kanan K. Datta (Presidency U), Rajesh Mondal (Sussex), Somnath Bharadwaj (IITKgp), Suman Majumdar (IITI)","submitted_at":"2018-10-15T11:10:30Z","abstract_excerpt":"The light-cone (LC) effect imprints the cosmological evolution of the redshifted 21-cm signal $T_{\\rm b} ({\\hat{\\bf{n}}}, \\nu)$ along the frequency axis which is the line of sight (LoS) direction of an observer. The effect is particularly pronounced during the Epoch of Reionization (EoR) when the mean hydrogen neutral fraction ${\\bar{x}_{\\rm HI}}(\\nu)$ falls rapidly as the universe evolves. The multi-frequency angular power spectrum (MAPS) ${{\\mathcal C}_{\\ell}}(\\nu_1,\\nu_2)$ quantifies the entire second-order statistics of $T_{\\rm b} ({\\hat{\\bf{n}}}, \\nu)$ considering both the systematic vari"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.06273","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}