Axions : Theory and Cosmological Role

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.

Comments: 43 pages, 10 figures; invited review submitted to Ann.Rev.Part.Nucl.Sci