Cosmology ParametersΒΆ
The default cosmological parameters in ARES are from Planck. Specifically, we take values from the last column of Table 4 in Planck XIII.
Note
Several input files (e.g., lookup tables for the halo mass function, initial conditions, etc.) depend on these vales. There currently is not a system in place to make sure there is a match between the parameters you pass at run-time and the lookup tables read-in from disk. Beware!
omega_m_0
Matter density, relative to the critical density.
Default: \(\Omega_{m,0} = 0.3089\)
omega_b_0
Baryon density, relative to the critical density.
Default: \(\Omega_{b,0} = 0.0486\)
omega_l_0
Dark energy density, relative to the critical density.
Default \(\Omega_{\Lambda,0} = 0.6911\)
hubble_0
Hubble parameter today.
Default: 0.6774 \([100 \ \text{km} \ \text{s}^{-1} \ \text{Mpc}^{-1}]\)
helium_by_mass
Fractional helium abundance by mass.
Default: 0.2453
cmb_temp_0
Temperature of the cosmic microwave blackbody, today.
Default: 2.7255 \([\text{K}]\)
sigma_8
Default: 0.8159
primordial_index
Default: 0.9667