Electroweak Baryogenesis in a Cold Universe

We discuss the possibility of generating the baryon asymmetry of the Universe when the temperature of the Universe is much below the electroweak scale. In our model the evaporation of primordial black holes or the decay of massive particles re-heats the surrounding plasma to temperatures above the electroweak transition temperature leading to restoration of electroweak symmetry locally. The symmetry is broken again spontaneously as the plasma cools and a baryon asymmetry is generated in the process. This mechanism is not sensitive to the details of the electroweak phase transition and works even when the transition is of second order. Furthermore there is no wash-out of the asymmetry after the phase transition as the plasma rapidly cools to lower temperatures thereby shutting off the sphaleron processes. Hence there is no constraint on the Higgs mass in our model.