Closed SafaeCosmology closed 1 year ago
Hi Safae,
@schoeneberg is the best person to answer this question. I give the answer I got from him previously, but tag him in case he has anything to add.
This is a bit of a philosophy question. For most cases, eta_b is the more direct quantity relevant for BBN, but personally I am of the philosophy to let codes deal with the conversion instead of trying to do it ourselves, and thus simply using the bbn_omega_b likelihood.
Best, Thejs
Dear @SafaeCosmology ,
the "bbn" likelihood is based on the BBN parameter "eta_b = number abundance of baryons/number abundance of photons" instead of being based on the more well known "omega_b" like the "bbn_omegab" likelihood. Usually you will want to use the "bbn_omegab" likelihood, I would say.
I suggest we might unify at some point the likelihoods and make the underlying used parameter a new option, since this has indeed created a bit of confusion for many people.
Let me know if there's anything else, Nils Sch.
Thank you very much for your answer
Hello everyone, I have a question regarding BBN data, I want to know please the difference between bbn and _bbn_omegab_ Likelihood. Thank you in advance.