Axion inflation with cross-correlated axion isocurvature perturbations

Kenji Kadota, Tatsuo Kobayashi, Hajime Otsuka

Research output: Contribution to journalArticlepeer-review

10 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 - Jan 25 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


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