Hi Antony and all,
a quick question regarding varying the Helium mass fraction. Have I understood correctly that, if I want to do this, I should first of all switch off bbn_consistency, i.e. in params_CMB_defaults.ini
and then just set the prior ranges for the parameter y_he as I would usually do, e.g.
Code: Select all
param[yhe] = 0.24 0.20 0.28 0.01 0.01
(the numbers I set are just for indicative purposes), where setting bbn_consistency to False is necessary to avoid bbn_consistency otherwise overwriting my prior on the Helium mass fraction? On a related note, say I were using only Planck data (TTTEEE+lowl+lowE), what would be reasonable values for the minimum and maximum ranges for yhe, and the proposed step size? I see the Planck public chains used
Code: Select all
param[yhe] = 0.245 0.1 0.5 0.006 0.006
is that what you would recommend?
Cheers,
Sunny