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We explore possible CP violating effects, coming from the Dirac phase of theMaki-Nakagawa-Sakata-Pontecorvo matrix, on the neutrino degeneracy parameters,at the epoch of Big-Bang nucleosynthesis. We first demonstrate the conditionsunder which such effects can arise. In particular it requires that the initialmuon and tau neutrino degeneracy parameters differ. Then we solve numericallythe kinetic equations for the three flavour neutrino density matrix with thegoal of quantifying the impact of the Dirac phase on the electron neutrinodegeneracy parameter. The calculations include the vacuum term, the coupling tomatter, the neutrino-neutrino interaction and the collisions. Effects onelectron neutrino degeneracy parameter up to almost 1.% and on Yp of about 0.1%are found, depending on the initial conditions.

CP violation effects on the neutrino degeneracy parameters in the Early Universe