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## 8. SM Higgs preheating 

On particular realistic example of preheating [124, 608] can be illustrated by the SM Higgs inflation [86]. After inflation the Higgs field evolves in time, h = h ( χ ( t )), see Eq. (215), so the effective masses of the fermions and of the gauge bosons also obtain time dependence. 

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where θ$_{W}$ is the Weinberg angle θ$_{W}$ = tan − $^{1}$( g$_{1}$/g$_{2}$ ), and y$_{f}$ , g$_{1}$ and g$_{2}$ are the Yukawa and the U (1)$_{Y}$ and SU (2)$_{L}$ couplings, respectively. The time dependent Higgs VEV spontaneously breaks the gauge symmetry, and give masses to W and Z gauge bosons masses. The relevant 

