Axion cosmology with its scalar superpartner

M. Hashimoto, K. I. Izawa, M. Yamaguchi, T. Yanagida

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


In supersymmetric theories, the Peccei-Quinn symmetry has a complex extension as a symmetry of the superpotential, so that the scalar potential always has an almost flat direction, the dilaton. We discuss how coherent oscillation of the dilaton affects axion cosmology. We stress that the dilaton decay, if its dominant mode is not into axions, releases large entropy at a late epoch of the Universe's evolution to dilute axion energy density and the upperbound of the decay constant is raised up to about 1015 GeV. The case of the M-theory axion is also discussed.

Original languageEnglish
Pages (from-to)44-50
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
Publication statusPublished - 1998 Oct 1


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