Planck 2018 results
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Table 1.

Base-ΛCDM cosmological parameters from Planck TT,TE,EE+lowE+lensing.

Parameter Plik best fit Plik [1] CamSpec [2] ([2]−[1])/σ1 Combined
Ωbh2 0.022383 0.02237 ± 0.00015 0.02229 ± 0.00015 −0.5 0.02233 ± 0.00015
Ωch2 0.12011 0.1200 ± 0.0012 0.1197 ± 0.0012 −0.3 0.1198 ± 0.0012
100θMC 1.040909 1.04092 ± 0.00031 1.04087 ± 0.00031 −0.2 1.04089 ± 0.00031
τ 0.0543 0.0544 ± 0.0073 −0.1 0.0540 ± 0.0074
ln(1010As) … 3.0448 3.044 ± 0.014 3.041 ± 0.015 −0.3 3.043 ± 0.014
ns 0.96605 0.9649 ± 0.0042 0.9656 ± 0.0042 +0.2 0.9652 ± 0.0042

Ωmh2 0.14314 0.1430 ± 0.0011 0.1426 ± 0.0011 −0.3 0.1428 ± 0.0011
H0 [ km s−1 Mpc−1] … 67.32 67.36 ± 0.54 67.39 ± 0.54 +0.1 67.37 ± 0.54
Ωm 0.3158 0.3153 ± 0.0073 0.3142 ± 0.0074 −0.2 0.3147 ± 0.0074
Age [Gyr] … 13.7971 13.797 ± 0.023 13.805 ± 0.023 +0.4 13.801 ± 0.024
σ8 0.8120 0.8111 ± 0.0060 0.8091 ± 0.0060 −0.3 0.8101 ± 0.0061
S8 ≡ σ8m/0.3)0.5 0.8331 0.832 ± 0.013 0.828 ± 0.013 −0.3 0.830 ± 0.013
zre 7.68 7.67 ± 0.73 7.61 ± 0.75 −0.1 7.64 ± 0.74
100θ* 1.041085 1.04110 ± 0.00031 1.04106 ± 0.00031 −0.1 1.04108 ± 0.00031
rdrag [Mpc] … 147.049 147.09 ± 0.26 147.26 ± 0.28 +0.6 147.18 ± 0.29

Notes. Results for the parameter best fits, marginalized means and 68% errors from our default analysis using the Plik likelihood are given in the first two numerical columns. The CamSpec likelihood results give some idea of the remaining modelling uncertainty in the high- polarization, though parts of the small shifts are due to slightly different sky areas in polarization. The “Combined” column give the average of the Plik and CamSpec results, assuming equal weight. The combined errors are from the equal-weighted probabilities, hence including some uncertainty from the systematic difference between them; however, the differences between the high- likelihoods are so small that they have little effect on the 1σ errors. The errors do not include modelling uncertainties in the lensing and low- likelihoods or other modelling errors (such as temperature foregrounds) common to both high- likelihoods. A total systematic uncertainty of around 0.5σ may be more realistic, and values should not be overinterpreted beyond this level. The best-fit values give a representative model that is an excellent fit to the baseline likelihood, though models nearby in the parameter space may have very similar likelihoods. The first six parameters here are the ones on which we impose flat priors and use as sampling parameters; the remaining parameters are derived from the first six. Note that Ωm includes the contribution from one neutrino with a mass of 0.06 eV. The quantity θMC is an approximation to the acoustic scale angle, while θ* is the full numerical result.

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