Axion inflation with cross-correlated axion isocurvature perturbations

Kenji Kadota, Tatsuo Kobayashi, Hajime Otsuka

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)


    We study the inflation scenarios, in the framework of superstring theory, where the inflaton is an axion producing the adiabatic curvature perturbations while there exists another light axion producing the isocurvature perturbations. We discuss how the non-trivial couplings among string axions can generically arise, and calculate the consequent cross-correlations between the adiabatic and isocurvature modes through concrete examples. Based on the Planck analysis on the generally correlated isocurvature perturbations, we show that there is a preference for the existence of the correlated isocurvature modes for the axion monodromy inflation while the natural inflation disfavors such isocurvature modes.

    Original languageEnglish
    Article number044
    JournalJournal of Cosmology and Astroparticle Physics
    Issue number1
    Publication statusPublished - 2016 Jan 25


    • axions
    • inflation
    • string theory and cosmology

    ASJC Scopus subject areas

    • Astronomy and Astrophysics


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