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We compute the baryon asymmetry generated from Cold Electroweak Baryogenesis,when a dynamical Beyond-the-Standard-Model scalar singlet field triggers thespinodal transition. Using a simple potential for this additional field, wematch the speed of the quench to earlier simulations with a "by-hand" massflip. We find that for the parameter subspace most similar to a by-handtransition, the final baryon asymmetry shows a similar dependence on quenchtime and is of the same magnitude. For more general parameter choices theHiggs-singlet dynamics can be very complicated, resulting in an enhancement ofthe final baryon asymmetry. Our results validate and generalise results ofsimulations in the literature and open up the Cold Electroweak Baryogenesisscenario to further model building.

Simulations of Cold Electroweak Baryogenesis: Quench from portal coupling to new singlet field