Features from the non-attractor beginning of inflation

Yi Fu Cai, Jinn Ouk Gong, Dong Gang Wang, Ziwei Wang

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


We study the effects of the non-attractor initial conditions for the canonical single-field inflation. The non-attractor stage can last only several e-folding numbers, and should be followed by hilltop inflation. This two-stage evolution leads to large scale suppression in the primordial power spectrum, which is favored by recent observations. Moreover we give a detailed calculation of primordial non-Gaussianity due to the ''from non-attractor to slow-roll'' transition, and find step features in the local and equilateral shapes. We conclude that a plateau-like inflaton potential with an initial non-attractor phase yields interesting features in both power spectrum and bispectrum.

Original languageEnglish
Article number017
JournalJournal of Cosmology and Astroparticle Physics
Issue number10
StatePublished - 11 Oct 2016

Bibliographical note

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© 2016 IOP Publishing Ltd and Sissa Medialab srl .


  • cosmological perturbation theory
  • ination
  • initial conditions and eternal universe


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