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

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.

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ArXiv.org
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2025-04-25
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Solar and Space Plasma Dynamics
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article

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

D. Kirkby, H. E. Noriega, Will J. Percival, F.J Castander et al.
ArXiv.org
Solar and Space Plasma Dynamics
article

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

D. Kirkby, H. E. Noriega, Will J. Percival, F.J Castander, O. Lahav, C. Ravoux, Paul A. Taylor, Zhongxu Zhai, C. García-Quintero, D. Brooks, Willem Elbers, Hyunjong Seo, D. Schlegel, E. Chaussidon, A. Muñoz-Gutiérrez, R. Miquel, Roger de Belsunce, C. Hahn, P. Carrilho, Michael S. Schubnell, N. Deiosso, Graziano Rossi, N. Palanque‐Delabrouille, S. Nadathur, H. K. Herrera-Alcantar, M. Walther, J. Ereza, Gregory Tarlé, Andreu Font-Ribera, John Della Costa, Laurent Le Guillou, David Sprayberry, Christophe Yèche, Gustavo Niz, M. Landriau, Ignasi Pérez-Ràfols, Axel de la Macorra, Héctor Gil-Marín, O. Alves, José Aguilar, D Huterer, K Honscheid, M. E. Levi, William L. Matthewson, A. Avilés, J. A. Newman, Shaun Cole, Anthony Kremin, Satya Gontcho A Gontcho, J. Mena-Fernández, Ashley J. Ross, S. BenZvi, A. Carnero Rosell, Cheng Zhao, A. de Mattia, Andrei Cuceu, J. Guy, Cullan Howlett, Jeffrey H. Silber, E. Paillas, Steven P. Ahlen, Aaron Meisner, Davide Bianchi, Pauline Zarrouk, Biprateep Dey, A. Leauthaud, M. Rashkovetskyi, R. Kehoe, John Moustakas, Z. Ding, A. Shafieloo, U. Andrade, Mustapha Ishak, E. Sanchez, Qiong Li, Rong Zhou, Jiaming Pan, M. Vargas-Magaña, C. Lamman, K. Lodha, G. Gutierrez, T. Claybaugh, J. Rohlf, F. Prada, B. A. Weaver, J. E. Forero-Romero, S. Bailey, E. Gaztañaga, Peter Doel, Marc Manera, Arjun Dey, E. Burtin, R. Calderón, S. Juneau, D. Chebat
article en

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.

ArXiv.org
Boston University (US), Institució Catalana de Recerca i Estudis Avançats (ES), Universitat Autònoma de Barcelona (ES), Universidad de Guanajuato (MX), Fermi National Accelerator Laboratory (US), Hiroshima Shudo University (JP), Harvard University (US), High Energy Accelerator Research Organization (JP), University of Waterloo (CA), Universidad de La Laguna (ES), The University of Queensland (AU), University of Pittsburgh (US), Shanghai Jiao Tong University (CN), Perimeter Institute (CA), Institute for High Energy Physics (ES), University of Milan (IT), Institut Mines-Télécom (FR), San Diego State University (US), Korea Astronomy and Space Science Institute (KR), Brera Astronomical Observatory (IT), Regional Municipality of Waterloo (CA), Sejong University (KR), National Solar Observatory (US), Institut d'Estudis Espacials de Catalunya (ES), Korean Association for the Study of Intestinal Diseases (KR), Institut Català de Ciències del Clima (ES), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), Indiana Cancer Consortium (US), Centre for Theoretical Physics and Astrophysics (UZ), Michigan United (US), Unidades Centrales Científico-Técnicas (ES), Institut Cartogràfic i Geològic de Catalunya (ES), UC Irvine Health (US), Laboratoire de Physique Subatomique et de Cosmologie (FR), Mylan (Switzerland) (CH), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES), State Library of Ohio (US), University College London (GB), University of Rochester (US), University of Portsmouth (GB), Universidad Intercontinental (MX), Universidad Nacional Autónoma de México (MX), Siena College (US), Netherlands Institute for Radio Astronomy (NL), Universitat Politècnica de Catalunya (ES)
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