Title: Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data

Authors: C. Garcia-Quintero , H. E. Noriega , A. de Mattia , A. Aviles , K. Lodha , D. Chebat , J. Rohlf , S. Nadathur , W. Elbers , J. Aguilar , S. Ahlen , O. Alves , U. Andrade , S. Bailey , S. BenZvi , D. Bianchi , D. Brooks , E. Burtin , R. Calderon , A. Carnero Rosell , P. Carrilho , F. J. Castander , E. Chaussidon , T. Claybaugh , S. Cole , A. Cuceu , R. de Belsunce , A. de la Macorra , N. Deiosso , J. Della Costa , Arjun Dey , Biprateep Dey , Z. Ding , P. Doel , A. Font-Ribera , J. E. Forero-Romero , E. Gaztañaga , H. Gil-Marín , S. Gontcho A Gontcho , G. Gutierrez , J. Guy , C. Hahn , H. K. Herrera-Alcantar , K. Honscheid , C. Howlett , D. Huterer , M. Ishak , S. Juneau , R. Kehoe , D. Kirkby , A. Kremin , O. Lahav , C. Lamman , M. Landriau , L. Le Guillou , A. Leauthaud , M. E. Levi , Q. Li , M. Manera , P. Martini , W. L. Matthewson , A. Meisner , J. Mena-Fernández , R. Miquel , J. Moustakas , A. Muñoz-Gutiérrez , J. A. Newman , G. Niz , E. Paillas , N. Palanque-Delabrouille , J. Pan , W. J. Percival , F. Prada , I. Pérez-Ràfols , M. Rashkovetskyi , C. Ravoux , A. J. Ross , G. Rossi , E. Sanchez , D. Schlegel , M. Schubnell , H. Seo , A. Shafieloo , J. Silber , D. Sprayberry , G. Tarlé , P. Taylor , M. Vargas-Magaña , M. Walther , B. A. Weaver , C. Yèche , P. Zarrouk , Z. Zhai , C. Zhao , R. Zhou

View PDF HTML (experimental) Abstract: We report cosmological results from the Dark Energy Spectroscopic Instrument (DESI) measurements of baryon acoustic oscillations (BAO) when combined with recent data from the Atacama Cosmology Telescope (ACT). By jointly analyzing ACT and Planck data and applying conservative cuts to overlapping multipole ranges, we assess how different Planck+ACT dataset combinations affect consistency with DESI. While ACT alone exhibits a tension with DESI exceeding 3$\sigma$ within the $\Lambda$CDM model, this discrepancy is reduced when ACT is analyzed in combination with Planck. For our baseline DESI DR2 BAO+Planck PR4+ACT likelihood combination, the preference for evolving dark energy over a cosmological constant is about 3$\sigma$, increasing to over 4$\sigma$ with the inclusion of Type Ia supernova data. While the dark energy results remain quite consistent across various combinations of Planck and ACT likelihoods with those obtained by the DESI collaboration, the constraints on neutrino mass are more sensitive, ranging from $\sum m_\nu < 0.061$ eV in our baseline analysis, to $\sum m_\nu < 0.077$ eV (95\% confidence level) in the CMB likelihood combination chosen by ACT when imposing the physical prior $\sum m_\nu>0$ eV. Comments: References added and author list corrected. The manuscript contains 16 pages, 7 figures, 4 tables Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; General Relativity and Quantum Cosmology (gr-qc) Cite as: arXiv:2504.18464 [astro-ph.CO] arXiv:2504.18464v2 [astro-ph.CO] for this version)

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From: Cristhian Garcia-Quintero [ view email ]
[v1] Fri, 25 Apr 2025 16:20:03 UTC (2,156 KB)
Wed, 30 Apr 2025 16:35:52 UTC (2,157 KB)
View a PDF of the paper titled Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data, by C. Garcia-Quintero and 94 other authors

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