[CAMB] $N_{eff}$ and taking derivatives
Posted: October 07 2018
Hello Dr. Lewis,
I'm interested in taking derivatives of matter power spectra with respect to $N_{eff}$ in order to get Fisher estimates.
Unfortunately, I'm confused because there seem to be two parameters with very similar names, nnu and standard_neutrino_neff.
The documentation has this to say about them:
Furthermore, if I wanted to slightly change $N_{eff}$, I'm unclear as to whether they should both change or only one of them.
I appreciate any assistance.
Felipe Maldonado
I'm interested in taking derivatives of matter power spectra with respect to $N_{eff}$ in order to get Fisher estimates.
Unfortunately, I'm confused because there seem to be two parameters with very similar names, nnu and standard_neutrino_neff.
The documentation has this to say about them:
I apologize, but I'm just uncertain on what is the difference between these two parameters.
- nnu – N_eff, effective relativistic degrees of freedom
- standard_neutrino_neff – default value for N_eff in standard cosmology (non-integer to allow for partial heating of neutrinos at electron-positron annihilation and QED effects)
Furthermore, if I wanted to slightly change $N_{eff}$, I'm unclear as to whether they should both change or only one of them.
I appreciate any assistance.
Felipe Maldonado