Inflation from a Supersymmetric Axion Model

TL;DR

This paper demonstrates that a supersymmetric axion model can naturally produce hybrid inflation, with the Peccei-Quinn scalar acting as the waterfall field, and predicts the axion as a dark matter candidate after entropy production.

Contribution

It introduces a novel connection between supersymmetric axion models and hybrid inflation, predicting the Peccei-Quinn scale and dark matter properties.

Findings

Peccei-Quinn scale around 10^{15} GeV

Axion as dark matter candidate

Cosmological implications discussed

Abstract

We show that a supersymmetric axion model naturally induces a hybrid inflation with the waterfall field identified as a Peccei-Quinn scalar. The Peccei-Quinn scale is predicted to be around 10^{15}GeV for reproducing the large-scale density perturbation of the Universe. After the built-in late-time entropy-production process, the axion becomes a dark matter candidate. Several cosmological implications are discussed.