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It has been argued by Pisarski and Wilczek that finite temperaturerestoration of the chiral symmetry SU(Nf) x SU(Nf) is first-order for Nf >=3.This type of chiral symmetry with a large Nf may appear in the Higgs sector ifone considers models such as walking technicolor theories. We examine thefirst-order restoration of the chiral symmetry from the point of view of theelectroweak phase transition. The strength of the transition is estimated inSU(2) x U(1) gauged linear sigma model by means of the finite temperatureeffective potential at one-loop with the ring improvement. Even if the mass ofthe neutral scalar boson corresponding to the Higgs boson is larger than 114GeV, the first-order transition can be strong enough for the electroweakbaryogenesis, as long as the extra massive scalar bosons (required for thelinear realization) are kept heavier than the neutral scalar boson. Explicitsymmetry breaking terms reduce the strength of the first-order transition, butthe transition can remain strongly first-order even when the masses of pseudoNambu-Goldstone bosons become as large as the current lower bound of directsearch experiments.

First-order restoration of SU(Nf) x SU(Nf) chiral symmetry with large Nf and Electroweak phase transition