CLASS code for computing the CMB anisotropy power spectra and the matter power spectrum with massless self-interacting neutrinos. The associated paper can be found here https://arxiv.org/abs/2011.12315.
Requirements:
Same as CLASS version 2.9.0
Key Changes:
The idr species in CLASS is being used as the interacting neutrinos. The example input file sinu_example.ini explains the new input parameters.
N_idr : Number of neutrino species
xi_idr : Temperature of neutrino relative to photon
log_G_eff_idr_i : The 4-Fermi coupling strength for the i-th neutrino species
N.B.- Alongwith N_idr, one can use the usual N_ur parameter for relativistic species. However, the N_ur part will not have self-interaction.
Warning
- The idm species has been deactivated in the code. Therefore, always set Omega_idm_dr = 0.
- The default N_ur has been set to 0.
Authors
Anirban Das & Subhajit Ghosh
Citation
If you use the code in your work, please cite this repository, the associated paper https://arxiv.org/abs/2011.12315, and the original CLASS paper https://arxiv.org/abs/1104.2933.