Axion Inflation, Proton Decay and Leptogenesis in $SU(5)\times U(1)_{PQ}$

TL;DR

This paper presents a non-supersymmetric SU(5) model integrating axion inflation, dark matter, proton decay, and leptogenesis, achieving gauge unification and electroweak vacuum stability.

Contribution

It introduces a novel SU(5) framework with axion-driven inflation, linking dark matter, proton decay, and baryogenesis in a unified non-supersymmetric setting.

Findings

Axion dark matter with suppressed isocurvature fluctuations

Proton lifetime estimates around 8e34-3e35 years

Gauge coupling unification and electroweak vacuum stabilization

Abstract

We implement inflation in a non-supersymmetric SU(5) model based on a non-minimal coupling of the axion field to gravity. The isocurvature fluctuations are adequately suppressed, axions comprise the dark matter, proton lifetime estimates are of order 8e34-3e35 years, and the observed baryon asymmetry arises via non-thermal leptogenesis. The presence of low scale colored scalars ensures unification of the Standard Model gauge couplings and also helps in stabilizing the electroweak vacuum.