Non-Gaussianity from isocurvature perturbations

Masahiro Kawasaki, Kazunori Nakayama, Toyokazu Sekiguchi, Teruaki Suyama, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)


We develop a formalism for studying non-Gaussianity in both curvature and isocurvature perturbations. It is shown that non-Gaussianity in the isocurvature perturbation between dark matter and photons leaves distinct signatures in the cosmic microwave background temperature fluctuations, which may be confirmed in future experiments, or possibly even in the currently available observational data. As an explicit example, we consider the quantum chromodynamics axion and show that it can actually induce sizable non-Gaussianity for the inflationary scale, Hinf = O(109-1011) GeV.

Original languageEnglish
Article number019
JournalJournal of Cosmology and Astroparticle Physics
Issue number11
Publication statusPublished - 2008
Externally publishedYes


  • Axions
  • Cosmology of theories beyond the SM
  • Physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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