Smooth hybrid inflation in a supersymmetric axion model

Masahiro Kawasaki, Naoya Kitajima, Kazunori Nakayama

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We show that the smooth hybrid inflation is naturally realized in a framework of a supersymmetric axion model. Identifying the Peccei-Quinn scalar fields as a part of the inflaton sector, successful inflation takes place reproducing the amplitude and spectral index of the curvature perturbation observed by WMAP. A relatively large axion isocurvature perturbation and its non-Gaussianity are predicted in our model. The saxion coherent oscillation has a large amplitude and dominates the Universe. The subsequent decay of the saxion produces a huge amount of entropy, which dilutes unwanted relics. Winos, the lightest supersymmetric particles in this scenario, are produced nonthermally in the decay and account for dark matter.

Original languageEnglish
Article number035010
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number3
Publication statusPublished - 2013 Feb 6


Dive into the research topics of 'Smooth hybrid inflation in a supersymmetric axion model'. Together they form a unique fingerprint.

Cite this