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

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Published 6 September 2013 • Published under licence by IOP Publishing Ltd
, , Citation Tomohiro Fujita and Shuichiro Yokoyama JCAP09(2013)009 DOI 10.1088/1475-7516/2013/09/009

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Author affiliations

1 Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), TODIAS, the University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8583, Japan

2 Department of Physics, University of Tokyo, Bunkyo-ku 113-0033, Japan

3 Institute for Cosmic Ray Research, University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba, 277-8582, Japan

Dates

  1. Received 3 July 2013
  2. Accepted 5 August 2013
  3. Published

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1475-7516/2013/09/009

Abstract

We compute the power spectrum Script Pζ 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 Script Pζ,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 Script Pζ, the constraint from τNL is most stringent. We also find a general relationship between fNL and τNL generated in this model. Even if fNL ∼ Script O(1), a detectable τNL can be produced.

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10.1088/1475-7516/2013/09/009