Axions : Theory and Cosmological Role

TL;DR

This paper reviews recent advances in axion cosmology, discussing their role as dark matter, their origins from topological defects, and implications in supersymmetric models, highlighting their significance in understanding the universe.

Contribution

It provides a comprehensive overview of recent theoretical and cosmological developments related to axions, including their production mechanisms and observational signatures.

Findings

Axions can constitute cold dark matter.

Topological defects are significant sources of axions.

Axion models have implications for non-Gaussian isocurvature perturbations.

Abstract

We review recent developments on axion cosmology. Topics include : axion cold dark matter, axions from topological defects, axion isocurvature perturbation and its non-Gaussianity and axino/saxion cosmology in supersymmetric axion model.