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.
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The Atacama Cosmology Telescope: DR6 Constraints on Extended Cosmological Models
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.