Table 9
Cosmological parameters used in our 6-parameter model.
| Parameter | Prior range | Definition |
|
|
||
| Ωbh2 ........ | [0.005,0.1] | Baryon density today |
| Ωch2 ........ | [0.001,0.99] | Cold dark matter density today |
| 100θMC ........ | [0.5,10.0] | 100 × approximation to r∗/DA (CosmoMC) |
| τ ........ | [0.01,0.8] | Thomson scattering optical depth due to reionization |
| ns ........ | [0.9,1.1] | Scalar spectrum power-law index (k0 = 0.05 Mpc-1) |
| ln(1010As) ........ | [2.7,4.0] | Log power of the primordial curvature perturbations (k0 = 0.05 Mpc-1) |
|
|
||
| ΩΛ ........ | Dark energy density divided by the critical density today | |
| σ8 ........ | RMS matter fluctuations today in linear theory | |
| zre ........ | Redshift at which Universe is half reionized | |
| H0 ........ | [20, 100] | Current expansion rate in km s-1 Mpc-1 |
| Age/Gyr ........ | Age of the Universe today (in Gyr) | |
| 100θeq ........ | 100 × angular size of the comoving horizon at matter-radiation equality | |
| rdrag = rs(zdrag) .... | Comoving size of the sound horizon at z = zdrag | |
Notes. For each, we give the symbol, prior range, and summary definition. The top block contains parameters with uniform priors that are varied in the MCMC chains. The ranges of these priors are listed in square brackets. The lower blocks define various derived parameters. A more complete table of parameters can be found in Planck Collaboration XVI (2014). Best-fit values are given in Table 10.
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