Simulations of cold electroweak baryogenesis: dependence on the source of CP-violation

• Main Authors: Zong-Gang Mou, Paul M. Saffin, Anders Tranberg
• Format: Article
• Language: English
• Published: SpringerOpen 2018-05-01
• Series: Journal of High Energy Physics
• Subjects: CP violation; Cosmology of Theories beyond the SM; Lattice Quantum Field Theory; Nonperturbative Effects
• Online Access: http://link.springer.com/article/10.1007/JHEP05(2018)197

Abstract We compute the baryon asymmetry created in a tachyonic electroweak symmetry breaking transition, focusing on the dependence on the source of effective CP-violation. Earlier simulations of Cold Electroweak Baryogenesis have almost exclusively considered a very specific CP-violating term explicitly biasing Chern-Simons number. We compare four different dimension six, scalar-gauge CP-violating terms, involving both the Higgs field and another dynamical scalar coupled to SU(2) or U(1) gauge fields. We find that for sensible values of parameters, all implementations can generate a baryon asymmetry consistent with observations, showing that baryogenesis is a generic outcome of a fast tachyonic electroweak transition.