neutrino distribution

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Rui Hu
Posts: 2
Joined: February 15 2023
Affiliation: Chinese University of Hong Kong

neutrino distribution

Post by Rui Hu » February 15 2023

Hi everyone,

I am confused about the neutrino distribution function in CAMB and COSMOMC. So basically, it seems we have two choices:

[math] and a thermal one [math] where [math]

which one is actually used in CAMB and COMSOMC(it looks to me the thermal one) and why? And in COSMOMC why do we need to times [math] to get the [math] but for seterile neutrino we just use [math]

BTW, especially for sterile neutrino, prof S.Pastor argued in arxiv1905.11290v3 that the first disturbution is more accurate than the thermal one. I would like to hear your comments if it uses thermal distribution in CAMB.

Looking forward to your comments!

Antony Lewis
Posts: 1932
Joined: September 23 2004
Affiliation: University of Sussex
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Re: neutrino distribution

Post by Antony Lewis » February 15 2023

The neutrino model is described in the CAMB notes. meffsterile is defined as in the Planck parameter papers.

Rui Hu
Posts: 2
Joined: February 15 2023
Affiliation: Chinese University of Hong Kong

Re: neutrino distribution

Post by Rui Hu » February 17 2023

now I understand. Thanks a lot!

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