Baryon asymmetry from electroweak tachyonic preheating

Details Baryon asymmetry from electroweak tachyonic preheating Baryon asymmetry from electroweak tachyonic preheating

2003-10-30

arxiv.org/abs/hep-ph/0310342v1

JHEP 0311:016,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, 9 figures

Scientific paper

10.1088/1126-6708/2003/11/016

We consider a scenario in which the baryon asymmetry was created in the early universe during a cold electroweak transition. The spinodal instability of the Higgs field caused by a rapid change of sign of its effective mass-squared parameter induces tachyonic preheating. We study the development of Chern-Simons number in this transition by numerical lattice simulations of the SU(2)-Higgs model with an added effective CP-violating term. A net asymmetry is produced, and we study its dependence on the size of CP violation and the ratio of Higgs to W mass.

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