Higher order statistics of curvature perturbations in IFF model and its Planck constraints

Tomohiro Fujita, Shuichiro Yokoyama

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

We compute the power spectrum ζ and non-linear parameters fNL and τNL of the curvature perturbation induced during inflation by the electromagnetic fields in the kinetic coupling model (IFF model). By using the observational result of ζ,fNL and τNL reported by the Planck collaboration, we study the constraint on the model comprehensively. Interestingly, if the single slow-rolling inflaton is responsible for the observed ζ, the constraint from τNL is most stringent. We also find a general relationship between fNL and τNL generated in this model. Even if fNL ∼ (1), a detectable τNL can be produced.

Original languageEnglish
Article number009
JournalJournal of Cosmology and Astroparticle Physics
Volume2013
Issue number9
DOIs
Publication statusPublished - 2013 Sep
Externally publishedYes

Keywords

  • inflation
  • non-gaussianity
  • primordial magnetic fields

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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