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

TL;DR

This paper explores a Higgs inflation model within a radiative seesaw framework featuring an inert doublet, addressing theoretical constraints and proposing testability at the ILC through specific scalar boson signatures.

Contribution

It introduces a Higgs inflation scenario in a radiative seesaw model with an inert doublet, compatible with current data and testable at the ILC, expanding the phenomenological implications of such models.

Findings

Parameter regions where inert scalars act as inflatons.

Compatibility with neutrino, dark matter, LEP, and LHC data.

Potential for testing at the ILC through decay endpoint measurements.

Abstract

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, it would be difficult to satisfy theoretical constraints from vacuum stability and perturbative unitarity. These problems can be solved by considering multi-Higgs models. In this talk, we discuss a Higgs inflation scenario in a radiative seesaw model with an inert doublet, which originally has been proposed to explain dark matter and neutrino masses. We study this model under the constraints from the current data, and find parameter regions where additional scalar bosons can play a role of inflatons. They satisfy the current data from neutrino experiments, the dark matter searches and also from LEP and LHC. A unique phenomenological prediction appears in the mass spectrum of inert scalar bosons. We show that this scenario is challenging to be tested at the LHC, but would be well testable at the International Liner Collider by measuring endpoints of energy distribution of a two jet system from decay processes of the inert scalar fields produced via pair production.