Effective field theory of waterfall in hybrid inflation

Jinn Ouk Gong, Maria Mylova

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We examine the validity of the classical approximation of the waterfall phase transition in hybrid inflation from an effective field theory (EFT) point of view. The EFT is constructed by integrating out the waterfall field fluctuations, up to one-loop order in the perturbative expansion. Assuming slow-roll conditions are obeyed, right after the onset of the waterfall phase, we find the backreaction of the waterfall field fluctuations to the evolution of the system can be dominant. In this case the classical approximation is completely spoiled. We derive the necessary constraint that ensures the validity of the EFT.

Original languageEnglish
Article number021
JournalJournal of Cosmology and Astroparticle Physics
Issue number7
StatePublished - 1 Jul 2022


  • cosmological perturbation theory
  • cosmological phase transitions
  • inflation


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