Inflation in a modified radiative seesaw model

TL;DR

This paper proposes an extension of a radiative neutrino mass model with an inert doublet dark matter to include inflation, demonstrating that the model can produce inflation consistent with CMB observations using sub-Planck scale inflaton values.

Contribution

It introduces a complex scalar extension to a radiative neutrino mass model, linking neutrino mass generation and inflation within a particle physics framework.

Findings

Inflation compatible with CMB data can be achieved in the extended model.

The model allows for sub-Planck scale inflaton values during inflation.

The scalar field connects neutrino mass generation to the inflationary epoch.

Abstract

The existence of the inflationary era in the early Universe seems to be strongly supported by recent CMB observations. However, only a few realistic inflation scenarios which have close relation to particle physics seem to have been known unfortunately. The radiative neutrino mass model with inert doublet dark matter is a promising model for the present experimental issues which cannot be explained within the standard model. In order to make the model include inflation, we extend it by a complex scalar field with a specific potential. This scalar could be closely related to the neutrino mass generation at a TeV scale as well as inflation. We show that the inflation favored by the CMB observations could be realized even if inflaton takes sub-Planck values during inflation.