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

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

Physical Review D

Advertised on:
10
2025
Number of authors
96
IAC number of authors
1
Citations
0
Refereed citations
0
Description
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 3σ within the ΛCDM 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 3σ, increasing to over 4σ 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 ∑mν<0.061 eV in our baseline analysis, to ∑mν<0.077 eV (95% confidence level) in the CMB likelihood combination chosen by ACT when imposing the physical prior ∑mν>0 eV.