In this talk, I discuss the possibility of radiative electroweak symmetry breaking where loop corrections to the mass parameter of the Higgs boson trigger the symmetry breaking in various non-supersymmetric extensions of the Standard Model (SM). Although the mechanism fails in the SM, it is shown to be quite successful in several extensions which share a common feature of having an additional scalar around the TeV scale. Due to the cross couplings between the scalars in the Higgs potential. the positive Higgs mass parameter at a high energy scale is turned negative in the renormalization group flow to lower energy. The type-II seesaw model, a two-loop radiative neutrino mass model, the inert doublet model, scalar singlet dark matter model, and a universal seesaw model with an additional U(1) broken at the TeV scale are studied and shown to exhibit successful radiative electroweak symmetry breaking when the additional scalars are at TeV scale. Large Hadron Collider (LHC) may be able to detect some of these TeV scale particles in near future.
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