  We consider the time-dependence of the Higgs vacuum expectation value (vev)
given by the dynamics of the Standard Model and study the non-adiabatic
production of both bosons and fermions, which is intrinsically
non-perturbative. In the Hartree approximation, we analyse the general
expressions that describe the dissipative dynamics due to the back-reaction of
the produced particles. In particular, we solve numerically some relevant cases
for the Standard Model phenomenology in the regime of relatively small
oscillations of the Higgs vev.
