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

Mou, Zong-Gang and Saffin, Paul M. and Tranberg, Anders (2017) Simulations of Cold Electroweak Baryogenesis: hypercharge U(1) and the creation of helical magnetic fields. Journal of High Energy Physics, 2017 (6). pp. 1-27. ISSN 1029-8479

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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)×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.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1007/JHEP06(2017)075
Depositing User: Saffin, Dr Paul
Date Deposited: 05 Jul 2017 12:55
Last Modified: 05 Jul 2017 13:00
URI: http://eprints.nottingham.ac.uk/id/eprint/43972

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