Unified Origin of Inflation, Baryon Asymmetry, and Neutrino Mass

TL;DR

This paper proposes a unified model linking the origins of neutrino mass, baryon asymmetry, and cosmic inflation, with predictions aligning well with current and future cosmological observations.

Contribution

It introduces a comprehensive framework integrating inflation, neutrino mass, and baryogenesis, utilizing a combined Higgs mechanism and Affleck-Dine process.

Findings

Inflationary spectral index matches observations.

Baryon asymmetry generated via Affleck-Dine mechanism.

Tensor-to-scalar ratio within future experimental reach.

Abstract

In this work, we present a unified theoretical framework that simultaneously addresses some of the most intriguing puzzles in particle physics and cosmology, namely the origins of neutrino mass, baryon asymmetry, and cosmic inflation. In our model, inflation is driven by a combination of the Standard Model Higgs, the type II seesaw Higgs responsible for neutrino mass generation, and the unified symmetry-breaking Higgs field. During inflation, non-zero values of the latter field ensure the absence of the monopole problem. The baryon asymmetry is generated through the Affleck-Dine mechanism, facilitated by the non-zero angular motion in the phase of a complex scalar field, which is part of the inflaton. We find that the successful parameter region for generating baryon asymmetry through a renormalizable term in the scalar potential requires a rather heavy type II seesaw triplet, with a mass well beyond the TeV scale. Inflationary observables, in particular, the spectral index is in excellent agree with experimental observation, whereas tensor-to scalar ratio is expected to be probed by the future LiteBIRD and CMB-S4 missions.