Kavli Affiliate: Marcela Carena
| First 5 Authors: Marcela Carena, Ying-Ying Li, Tong Ou, Hersh Singh,
| Summary:
We perform real-time simulation of fermion-bubble scattering during a first
order phase transition by which the fermions become massive. This
out-of-equilibrium dynamics can generate a CP asymmetry, which is a crucial
ingredient for baryon asymmetry generation in the early Universe. As a
prototype, we consider a 1+1-dimensional system, for which CP is replaced by
charge conjugation C. We use tensor network methods to study the C asymmetry
generation outside the bubble wall induced by a complex fermion mass profile.
In the asymptotic region, where reflected particles are far from the scattering
point, our lattice calculations are in good agreement with perturbative
calculations, but are also applicable in the nonpertubative regime. Real-time
evolution of the instantaneous asymmetry generation near the collision point is
also accessible within our framework and can be an order of magnitude larger
than the asymptotic value. This intriguing feature may have far-reaching
consequences in a full model calculation of electroweak baryogenesis. Our
studies provide a necessary step for guiding quantum simulations of early
universe phase transitions.
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