2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149120For realistic values of the Higgs boson mass the high temperature electroweak phase transition cannot be described perturbatively. The symmetric phase is governed by a strongly interacting $SU(2)$ gauge theory. Typical masses of excitations and scales of condensates are set by the ``high temperature confinement scale'' $\approx 0.2\ T$. For a Higgs boson mass around 100 GeV or above all aspects of the phase transition are highly nonperturbative. Near the critical temperature strong electroweak interactions are a dominant feature also in the phase with spontaneous symmetry breaking. Depending on the value of the Higgs boson mass the transition may be a first order phase transition or an analytical crossover.15 pages, plain tex, transmision error correctedHigh Energy Physics - Theorytext