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

Mou, Zong-Gang; Saffin, Paul M.; Tranberg, Anders

Abstract

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

Citation

Mou, Z., Saffin, P. M., & Tranberg, A. (2018). Simulations of Cold Electroweak Baryogenesis: quench from portal coupling to new singlet field. Journal of High Energy Physics, 2018(1), Article 103. https://doi.org/10.1007/JHEP01%282018%29103

• Journal Article Type: Article
• Acceptance Date: Jan 12, 2018
• Publication Date: Jan 22, 2018
• Deposit Date: Jan 30, 2018
• Publicly Available Date: Jan 30, 2018
• Journal: Journal of High Energy Physics
• Electronic ISSN: 1029-8479
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 2018
• Issue: 1
• Article Number: 103
• DOI: https://doi.org/10.1007/JHEP01%282018%29103
• Keywords: CP violation; Cosmology of theories beyond the SM; Lattice quantum field theory; Nonperturbative effects
• Public URL: https://nottingham-repository.worktribe.com/output/906496
• Publisher URL: https://doi.org/10.1007/JHEP01(2018)103