COLEMAN-WEINBERG PHASE-TRANSITION IN EXTENDED HIGGS MODELS

In Coleman-Weinberg symmetry breaking, all dimensionful parameters van ish and the symmetry is broken by loop corrections. Before Coleman-Wei nberg symmetry breaking in the standard model was experimentally ruled out, it had already been excluded on cosmological grounds. In this Br ief Report, the cosmological analysis is carried out for Coleman-Weinb erg models with extended Higgs sectors, which are not experimentally r uled out, and general constraints on such models are given.