Post
by **Helena Garcia** » January 19 2024

I am running the evaluate sampler in cobaya fixing all the LCDM and nuisance parameters of the likelihoods to the same values for both CLASS and CAMB (all of these parameters are set to the same values in both codes: logA,ns,ombh2,omch2,tau,A_planck,calib_100T,calib_217T,A_cib_217,xi_sz_cib,A_sz,ksz_norm, gal545_A_100,gal545_A_143 , gal545_A_143_217, gal545_A_217, ps_A_100_100, ps_A_143_143,ps_A_143_217, ps_A_217_217, galf_TE_A_100, galf_TE_A_100_143, galf_TE_A_100_217, galf_TE_A_143 , galf_TE_A_143_217, galf_TE_A_217, As,omegam,omegamh2,omega_de,Yhe).

I am also setting in CAMB nnu to 3.044 and mnu to and equivalently in CLASS N_ur to 3.044 and N_ncdm to 0

Adding Planck and BAODR16 likelihoods I am getting a **difference in the chi2 of 3.36880000000019**. The derived parameters **zre, sigma 8, age, and rdrag are also different**. I wanted to check that I obtained the same chi2 when running both codes with the same likelihoods but I didn't. Where can be the problem?

Thanks in advance!