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27/05/2020: Minor Update

  1. Updated the neutrino-electron interaction cross sections so as to include EW radiative corrections to the SM neutral current as relevant for E < 10 MeV. Neutrino-electron interaction rates are now 1.8% stronger than in the previous version.
  2. We still find Neff^SM = 3.045.
  3. We have now set m0 = me. It was previously m0 = 1 MeV. This does not change any result but only rescales the scale factor a.

10/01/2020: Major Update

  1. Included spin-statistics and the electron mass in the nu-e and nu-nu interaction rates
  2. We find Neff^SM = 3.045
  3. Additonal BSM models have been coded up
  4. Code is now in both Mathematica and Python (2 and 3) versions

20/08/2019: Major Update

  1. Corrected an error in the neutrino-electron interaction rates.
  2. We find Neff^SM = 3.053

19/12/2018: First Release

  1. We find Neff^SM = 3.034