Abstract
We calculate the electroweak sphaleron rates in the reduced minimal 3-3-1 (RM331) model. In the context of the early Universe, this model undergoes a sequence of two first-order phase transitions, at the TeV scale and at the scale, as the Universe cools down from the hot big bang. By a thin-wall approximation, we show that for each phase transition in this sequence, the sphaleron rate is larger than the cosmological expansion rate at temperatures higher than the critical temperature, and after the phase transition, the sphaleron process is decoupled. This may provide the baryon-number violation (B violation) necessary for baryogenesis in the relationship with nonequilibrium physics in the early Universe.
- Received 26 August 2014
DOI:https://doi.org/10.1103/PhysRevD.90.085019
© 2014 American Physical Society