Cosmological aspects of inflation in a supersymmetric axion model

Masahiro Kawasaki, Naoya Kitajima, Kazunori Nakayama

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


We show that the hybrid inflation is naturally realized in the framework of a supersymmetric axion model, which is consistent with the WMAP observation if the Peccei-Quinn symmetry-breaking scale is around 1015GeV. By solving the post-inflationary scalar dynamics, it is found that the scalar partner of the axion, saxion, oscillates with large amplitude and its decay produces a huge entropy and dilutes the axion. As a result, the axion coherent oscillation can be the dominant component of the dark matter in the Universe. Cosmological gravitino and axino problems are solved.

Original languageEnglish
Article number123521
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number12
Publication statusPublished - 2011 Jun 21
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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