The cosmic QCD transition for large lepton flavour asymmetries

We study the impact of large lepton flavour asymmetries on the cosmic QCD transition. Scenarios of unequal lepton flavour asymmetries are observationally almost unconstrained and therefore open up a whole new parameter space in order to study the nature of the cosmic QCD transition. For very large asymmetries, we point out two limitations to our current method, namely the possible formation of a Bose-Einstein condensate of pions and the reliability of the Taylor expansion applied in this work.