Cosmological aspects of inflation in a supersymmetric axion model

Details Cosmological aspects of inflation in a supersymmetric axion model Cosmological aspects of inflation in a supersymmetric axion model

2011-04-07

arxiv.org/abs/1104.1262v2

Phys.Rev.D83:123521,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 4 figures

Scientific paper

10.1103/PhysRevD.83.123521

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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