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arXiv · 1104.1262

Cosmological aspects of inflation in a supersymmetric axion model

Masahiro Kawasaki·Naoya Kitajima·Kazunori Nakayama
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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 10^{15}GeV. 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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Masahiro Kawasaki, Naoya Kitajima, Kazunori Nakayama. 2011-06-29. Cosmological aspects of inflation in a supersymmetric axion model. https://doi.org/10.1103/physrevd.83.123521

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