Table 17
Cosmological parameters used in this analysis.
| Parameter | Prior range | Baseline | Definition |
|
|
|||
| ωb ≡ Ωbh2 ............... | [0.005, 0.1] | ... | Baryon density today |
| ωc ≡ Ωch2 ............... | [0.001, 0.99] | ... | Cold dark matter density today |
| θ ≡ 100θMC ............... | [0.5, 10.0] | ... | 100 × approximation to r∗/DA (used in CosmoMC) |
| τ ............... | [0.01, 0.8] | ... | Thomson scattering optical depth due to reionization |
| τ ............... | (0.07 ± 0.02) | ||
| N eff ............... | [0.05, 10.0] | 3.046 | Effective number of neutrino-like relativistic degrees of freedom (see text) |
| Y P ............... | [0.1, 0.5] | BBN | Fraction of baryonic mass in helium |
| A L ............... | [0.0, 10] | 1 | Amplitude of the lensing power relative to the physical value |
| n s ............... | [0.8, 1.2] | ... | Scalar spectrum power-law index (k0 = 0.05 Mpc-1) |
| ln(1010As) ............... | [2, 4.0] | ... | Log power of the primordial curvature perturbations (k0 = 0.05 Mpc-1) |
|
|
|||
| ΩΛ ............... | ... | ... | Dark energy density divided by the critical density today |
| Age ............... | ... | ... | Age of the Universe today (in Gyr) |
| Ωm ............... | ... | ... | Matter density (inc. massive neutrinos) today divided by the critical density |
| z re ............... | ... | ... | Redshift at which Universe is half reionized |
| H 0 ............... | [20,100] | ... | Current expansion rate in km s-1 Mpc-1 |
| 100θD ............... | ... | ... | 100 × angular extent of photon diffusion at last scattering |
| 100θeq ............... | ... | ... | 100 × angular size of the comoving horizon at matter-radiation equality |
Notes. The columns indicate the cosmological parameter symbol, their uniform prior ranges in square brackets, or between parenthesis for a Gaussian prior, the baseline values if fixed for the standard ΛCDM model, and their definition. These parameters are the same as for the previous release. The top block lists the estimated parameters, while the lower block lists derived parameters.
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