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The Higgs inflation scenario is an approach to realize the cosmic inflation,where the Higgs boson plays a role of the inflaton. In the minimal model, itwould be difficult to satisfy theoretical constraints from vacuum stability andperturbative unitarity. These problems can be solved by considering multi-Higgsmodels. In this talk, we discuss a Higgs inflation scenario in a radiativeseesaw model with an inert doublet, which originally has been proposed toexplain dark matter and neutrino masses. We study this model under theconstraints from the current data, and find parameter regions where additionalscalar bosons can play a role of inflatons. They satisfy the current data fromneutrino experiments, the dark matter searches and also from LEP and LHC. Aunique phenomenological prediction appears in the mass spectrum of inert scalarbosons. We show that this scenario is challenging to be tested at the LHC, butwould be well testable at the International Liner Collider by measuringendpoints of energy distribution of a two jet system from decay processes ofthe inert scalar fields produced via pair production.

Higgs inflation scenario in a radiative seesaw model and its testability at the ILC