A unified likelihood analysis of Planck, ACT, and SPT data finds ΛCDM parameters stable under foreground model variations while neutrino-sector extension parameters show up to 35% larger uncertainties after marginalization.
60 80 H0 0.06 0.04 0.02 0.00 0.02 0.04 k 0.05 0.00 k ACT SPT Planck Planck+ACT+SPT Fig
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Combining CMB datasets with consistent foreground modelling
A unified likelihood analysis of Planck, ACT, and SPT data finds ΛCDM parameters stable under foreground model variations while neutrino-sector extension parameters show up to 35% larger uncertainties after marginalization.