Equilateral non-Gaussianity from heavy fields

Jinn Ouk Gong, Shi Pi, Misao Sasaki

Research output: Contribution to journalArticlepeer-review

78 Scopus citations


The effect of self-interactions of heavy scalar fields during inflation on the primordial non-Gaussianity is studied. We take a specific constant-turn quasi-single field inflation as an example. We derive an effective theory with emphasis on non-linear self-interactions of heavy fields and calculate the corresponding non-Gaussianity, which is of equilateral type and can be as relevant as those computed previously in the literature. We also derive the non-Gaussianity by directly using the in-in formalism, and verify the equivalence of these two approaches.

Original languageEnglish
Article number043
JournalJournal of Cosmology and Astroparticle Physics
Issue number11
StatePublished - Nov 2013


  • cosmological perturbation theory
  • inflation
  • non-gaussianity


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