Sterile neutrinos in CAMB

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Helena Garcia
Posts: 29
Joined: October 05 2021
Affiliation: UCI

Sterile neutrinos in CAMB

Post by Helena Garcia »

After reviewing CAMB documentation (https://cosmologist.info/notes/CAMB.pdf), I am still not sure if CAMB default settings allow to add a partially thermalized sterile neutrino (in addition to the 3 LCDM neutrinos). Does anyone know if this option is possible and what parameters I should sample to study a model that includes a partially thermalized sterile neutrino with free mass? Thanks!
Antony Lewis
Posts: 1964
Joined: September 23 2004
Affiliation: University of Sussex
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Re: Sterile neutrinos in CAMB

Post by Antony Lewis »

You can use meffsterile and nnu when calling set_cosmology (following Planck paper definitions).

More generally you can set the degeneracies of each individual eigenstate by setting the corresponding part of the CAMBparams structure.
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