Leptogenesis and neutrino mass with one right-handed neutrino and Higgs inflaton

TL;DR

This paper introduces a minimal model with one right-handed neutrino and a second Higgs doublet responsible for inflation and leptogenesis, fitting cosmological and neutrino data with high predictability.

Contribution

It presents a novel, minimal framework linking neutrino masses, baryon asymmetry, and inflation using only two new fields beyond the Standard Model.

Findings

Consistent with PLANCK 2018 and ACT 2025 data.

Predictive parameter space with potential for terrestrial detection.

Unified explanation for neutrino oscillations, baryogenesis, and inflation.

Abstract

We propose a novel and minimal setup where the observed baryon asymmetry of the Universe and neutrino oscillation data can be satisfied with only one right-handed neutrino (RHN) and a second Higgs doublet with the latter being also responsible for driving cosmic inflation. While inflation is realised via non-minimal coupling of the Higgs to gravity, baryon asymmetry is generated via Affleck-Dine leptogenesis. Due to the presence of only two new fields beyond the standard model (BSM), the proposed setup remains very predictive with only a small allowed parameter space consistent with the PLANCK 2018 and ACT 2025 data simultaneously. The preferred mass spectrum of the BSM particles also keeps the detection prospects alive at terrestrial experiments.