Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-02-23
Phys.Rev. D60 (1999) 123504
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, ReVTeX, 16 figures inserted with epsf. Small changes in the introduction and new references
Scientific paper
10.1103/PhysRevD.60.123504
We present a novel scenario for baryogenesis in a hybrid inflation model at the electroweak scale, in which the Standard Model Higgs field triggers the end of inflation. One of the conditions for successful baryogenesis, the departure from thermal equilibrium, is naturally achieved at the stage of preheating after inflation. The inflaton oscillations induce large occupation numbers for long-wavelength configurations of Higgs and gauge fields, which leads to a large rate of sphaleron transitions. We estimate this rate during the first stages of reheating and evaluate the amount of baryons produced due to a particular type of higher dimensional CP violating operator. The universe thermalizes through fermion interactions, at a temperature below critical, $T_{rh} < 100$ GeV, preventing the wash-out of the produced baryon asymmetry. Numerical simulations in (1+1) dimensions support our theoretical analysis.
Garcia-Bellido Juan
Grigoriev Dmitri
Kusenko Alexander
Shaposhnikov Mikhail
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