Simulations of Cold Electroweak Baryogenesis: Hypercharge U(1) and the creation of helical magnetic fields

Abstract

We perform numerical simulations of Cold Electroweak Baryogenesis, including for the first time in the Bosonic sector the full electroweak gauge group SU(2)$\times$U(1) and CP-violation. We find that the maximum generated baryon asymmetry is reduced by a factor of three relative to the SU(2)-only model, but that the quench time dependence is very similar. In addition, we compute the magnitude of the helical magnetic fields, and find that it is proportional to the strength of CP-violation and dependent on quench time, but is not proportional to the magnitude of the baryon asymmetry as proposed in the literature. Astrophysical signatures of primordial magnetic helicity can therefore not in general be used as evidence that electroweak baryogenesis has taken place.

28 pages, 15 figures, updated to match the published version

References in corpus (4)

• The Sphaleron Rate in the Minimal Standard Model
• Magnetic field production during preheating at the electroweak scale
• Primordial magnetic fields from preheating at the electroweak scale
• Helical Magnetic Fields from Sphaleron Decay and Baryogenesis

Cited by in corpus (8)

• Progress on Cosmological Magnetic Fields
• Non-Abelian gauge preheating
• A possible mass distribution of primordial black holes implied by LIGO-Virgo
• Vacuum Topology and the Electroweak Phase Transition
• Kibble mechanism for electroweak magnetic monopoles and magnetic fields
• Simulations of a bubble wall interacting with an electroweak plasma
• Simulations of Cold Electroweak Baryogenesis: Dependence on the source of CP-violation
• Classical equipartition dynamics between axions and non-Abelian gauge fields