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Cosmological aspects of inflation in a supersymmetric axion model

Masahiro Kawasaki1,2, Naoya Kitajima1, and Kazunori Nakayama3,4

  • 1Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan
  • 2Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba 277-8568, Japan
  • 3Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 4KEK Theory Center, Institute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki 305-0801, Japan

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Phys. Rev. D 83, 123521 – Published 21 June, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.123521

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 1015  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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See Also

Inflation from a supersymmetric axion model

Masahiro Kawasaki, Naoya Kitajima, and Kazunori Nakayama
Phys. Rev. D 82, 123531 (2010)

Article Text

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Phys. Rev. D 83, 123521– Published 21 June, 2011
  • Received 15 April 2011

© 2011 American Physical Society

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