Publication record · 18.cifr/2020.aghanim.planck-lcdm

Planck 2018 results. VI. Cosmological parameters

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N. Aghanim (Institut d'Astrophysique Spatiale), Y. Akrami (Imperial College London), Planck Collaboration (Multiple institutions)

RAI18.cifr/2020.aghanim.planck-lcdm

Astronomy & Astrophysics· 2020· doi:10.1051/0004-6361/201833910

We present cosmological parameter results from the final full-mission Planck measurements of the CMB anisotropies, combining temperature, polarization, and lensing reconstruction. We find Omegac h^2 = 0.120 +/- 0.001, Omegab h^2 = 0.0224 +/- 0.0001, ns = 0.965 +/- 0.004, tau = 0.054 +/- 0.007, H0 = 67.4 +/- 0.5 km/s/Mpc, sigma8 = 0.811 +/- 0.006.

cosmic microwave backgroundcosmological parametersΛCDMBayesian inferencePlanck satellite

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Determining the six ΛCDM parameters from CMB anisotropy data is the central task of observational cosmology. Earlier Planck releases had larger polarization modeling uncertainties. This paper delivers definitive sub-percent constraints and characterizes ΛCDM extensions.

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This paper presents final full-mission Planck CMB parameter constraints combining TT+TE+EE+lensing at unprecedented precision. Improved large-scale polarization modeling reduces τ uncertainty to ~13%, breaking degeneracies with As. Establishes a definitive 3.6σ Hubble tension between CMB and local distance-ladder measurements.

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