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Huber, Zack Li","cross_cats":["gr-qc","hep-ph"],"headline":"ACT DR6 data finds no statistically significant preference for extensions to the Lambda CDM model.","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-03-18T17:30:26Z","title":"The Atacama Cosmology Telescope: DR6 Constraints on Extended Cosmological Models"},"references":{"count":18,"internal_anchors":1,"resolved_work":18,"sample":[{"cited_arxiv_id":"1907.04473","doi":"10.1103/physrevlett.48.1220","is_internal_anchor":true,"ref_index":1,"title":"Abazajianet al., CMB-S4 Science Case, Reference Design, and Project Plan, (2019), arXiv:1907.04473 [astro-ph.IM]","work_id":"a7ec7157-2c9f-4081-a013-07fc4668e989","year":2019},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":2,"title":"We obtain the baseline settings summarized in §3 and reported in Figs","work_id":"6a636dd8-9af3-4508-a6de-8990ce9fd99d","year":2024},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":3,"title":"Since CosmoRec is not available with class, we use HyRec for models using this code","work_id":"96c1b5fe-f647-4a52-8fa1-642a5450499f","year":2020},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":4,"title":"Note that halofit version=mead2020 and BBN consistency from PRIMAT 2021 are already default settings in this camb version","work_id":"16416182-5181-4659-a77f-2e0c31bda573","year":2021},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":5,"title":"In this work, we use a version of the code that has been updated to implement the latest HMcode-2020 model for the non-linear power spectrum, provided by J","work_id":"424d28e1-cf42-4525-894b-3a0e9d5be7e5","year":2020}],"snapshot_sha256":"4e67913d3c1bdf41e6e96310afa4897d5cd121dc07d491ab78996d3b6951c165"},"source":{"id":"2503.14454","kind":"arxiv","version":2},"verdict":{"created_at":"2026-05-15T13:33:27.285207Z","id":"404d4fed-df9f-42ee-92f2-ed340a718b43","model_set":{"reader":"grok-4.3"},"one_line_summary":"ACT DR6 CMB data shows no significant evidence for extensions beyond Lambda CDM, with neutrino effective species at 2.86 plus or minus 0.13 and sum of neutrino masses below 0.082 eV at 95 percent CL.","pipeline_version":"pith-pipeline@v0.9.0","pith_extraction_headline":"ACT DR6 data finds no statistically significant preference for extensions to the Lambda CDM model.","strongest_claim":"We find no statistically significant preference for a departure from the baseline Lambda CDM model. 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