Cosmological aspects of inflation in a supersymmetric axion model

Masahiro Kawasaki; Naoya Kitajima; Kazunori Nakayama

doi:10.1103/PhysRevD.83.123521

Cosmological aspects of inflation in a supersymmetric axion model

Masahiro Kawasaki, Naoya Kitajima, Kazunori Nakayama

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

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 language	English
Article number	123521
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	83
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevD.83.123521
Publication status	Published - 2011 Jun 21
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.83.123521

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abstract = "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.",

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AU - Kitajima, Naoya

AU - Nakayama, Kazunori

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AB - 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.

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Cosmological aspects of inflation in a supersymmetric axion model

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