Charge asymmetry in two-Higgs doublet models

We discuss the features of a two-Higgs doublet model exhibiting a two stage phase transition. At finite temperatures electric charge violating station ary points an developed. In conjunction with CP violation in the Higgs or t he Yukawa sector, the phase transition to the charge conserving vacuum, gen erates a net charge asymmetry Delta Q, in the presence of heavy leptons, wh ich may be well above the astrophysical bounds put on Delta Q unless the he avy leptons are sufficiently massive. This type of transition may be of rel evance for supersymmetric extensions of the Standard Model, since it shares the same features, namely two Higgs doublers and similar CP violating sour ces. (C) 2000 Elsevier Science B.V. All rights reserved.