Correlation of isocurvature perturbation and non-Gaussianity

Jinn Ouk Gong, Godfrey Leung

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We explore the correlations between primordial non-Gaussianity and isocurvature perturbation. We sketch the generic relation between the bispectrum of the curvature perturbation and the cross-correlation power spectrum in the presence of explicit couplings between the inflaton and another light field which gives rise to isocurvature perturbation. Using a concrete model of a Peccei-Quinn type field with generic gravitational couplings, we illustrate explicitly how the primordial bispectrum correlates with the cross-correlation power spectrum. Assuming the resulting fNL ∼ (1), we find that the form of the correlation depends mostly upon the inflation model but only weakly on the axion parameters, even though fNL itself does depend heavily on the axion parameters.

Original languageEnglish
Article number042
JournalJournal of Cosmology and Astroparticle Physics
Issue number12
StatePublished - 22 Dec 2015

Bibliographical note

Publisher Copyright:
© 2015 IOP Publishing Ltd and Sissa Medialab srl .


  • axions
  • inflation
  • non-gaussianity


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