Inflation and DM phenomenology in a scotogenic model extended with a real singlet scalar

TL;DR

This paper explores an extended scotogenic model incorporating a real singlet scalar that influences neutrino mass, dark matter properties, and inflation, with implications for low-scale leptogenesis and observable signals like high-energy neutrinos.

Contribution

It introduces a singlet scalar into the scotogenic model, linking neutrino mass, dark matter, and inflation in a unified framework with low-scale leptogenesis.

Findings

Singlet scalar affects dark matter characteristics, especially near resonance regions.

Inflaton mass is in the TeV range with reheating temperature below 10^9 GeV.

Dark matter annihilation produces detectable high-energy neutrinos and gamma rays.

Abstract

We study an extension of the scotogenic model with a real singlet scalar. It gives an origin of the mass of right-handed neutrinos and plays a role of inflaton through a non-minimal coupling with Ricci scalar. While an inert doublet scalar is an indispensable ingredient for neutrino mass generation in the model, it is also a promising dark matter (DM) candidate. Introduction of the singlet scalar could affect its nature of DM if mass of the singlet scalar is in a resonance region. We focus our study on such a case where inflaton mass is expected to be in a TeV range and reheating temperature is less than $10^9$ GeV. Thus the model requires low scale leptogenesis. After examining several effects brought about by the singlet scalar for the DM sector, we discuss DM phenomenology such as high energy neutrinos and monochromatic gammas caused by its annihilation.