Planck 2018 Best Fit
Planck 2018 Best Fit Cosmology
68% confidence limits for the base ΛCDM model from the TT,TE,EE+lowE+lensing+BAO likelihood. Adapted from Wikipedia.
| Parameter | Symbol | Value |
|---|---|---|
| Baryon density | $\Omega_b h^2$ | 0.02242 ± 0.00014 |
| Cold dark matter density | $\Omega_c h^2$ | 0.11933 ± 0.00091 |
| 100 × approximation to $r_s/D_A$ (CosmoMC) | $100\,\theta_{\rm MC}$ | 1.04101 ± 0.00029 |
| Reionization optical depth | $\tau$ | 0.0561 ± 0.0071 |
| Curvature power spectrum amplitude | $\ln(10^{10} A_s)$ | 3.047 ± 0.014 |
| Scalar spectral index | $n_s$ | 0.9665 ± 0.0038 |
| Hubble constant (km s$^{-1}$ Mpc$^{-1}$) | $H_0$ | 67.66 ± 0.42 |
| Dark energy density | $\Omega_\Lambda$ | 0.6889 ± 0.0056 |
| Matter density | $\Omega_m$ | 0.3111 ± 0.0056 |
| Density fluctuations at $8 h^{-1}$ Mpc | $S_8 = \sigma_8(\Omega_m/0.3)^{1/2}$ | 0.825 ± 0.011 |
| Reionization redshift | $z_{\rm re}$ | 7.82 ± 0.71 |
| Age of the Universe (Gyr) | $t_0$ | 13.787 ± 0.020 |
| Decoupling redshift | $z_*$ | 1089.80 ± 0.21 |
| Comoving sound horizon at $z_*$ (Mpc) | $r_*$ | 144.57 ± 0.22 |
| 100 × angular scale of sound horizon at last scatter | $100\,\theta_*$ | 1.04119 ± 0.00029 |
| Baryon-drag redshift | $z_{\rm drag}$ | 1060.01 ± 0.29 |
| Comoving sound horizon at $z_{\rm drag}$ (Mpc) | $r_{\rm drag}$ | 147.21 ± 0.23 |