Inflation from a Supersymmetric Axion Model
Kawasaki, Masahiro (Institute for Cosmic Ray Research, University of Tokyo)

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.