zingale
commented
1 year ago It looks like Haft, Raffelt, and Weiss 1994 give a fit for plasma neutrinos that they claim is accurate: https://articles.adsabs.harvard.edu/pdf/1994ApJ...425..222H
it is equations 23 and following
Kippenhahn & Weigert have very simple expressions for the neutrino terms (Eqs. 18.81 to 18.86). It would be good to add a simpler neutrino routine with those. What we are using might be more than is needed.