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Axion Cosmology with its Scalar Superpartner

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arxiv hep-ph/9803263 v1 pith:DQY4JCZ6 submitted 1998-03-06 hep-ph

M. Hashimoto , K.-I. Izawa , M. Yamaguchi , T. Yanagida This is my paper · ORCID
classification hep-ph
keywords axiondilatoncosmologydecayscalarsymmetryaffectsalmost
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abstract

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 $10^{15}$ GeV. The case of the M-theory axion is also discussed.

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  1. Decay rate of PQ-ball

    hep-ph 2025-04 conditional novelty 6.0 of 10

    PQ-balls, Q-balls in a spontaneously broken U(1) theory, are metastable in vacuum and decay at a rate proportional to the square of their asymptotic field value.

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