Consistency relations in multi-field inflation

Jinn Ouk Gong, Min Seok Seo

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We study the consequences of spatial coordinate transformation in multi-field inflation. Among the spontaneously broken de Sitter isometries, only dilatation in the comoving gauge preserves the form of the metric and thus results in quantum-protected Slavnov-Taylor identities. We derive the corresponding consistency relations between correlation functions of cosmological perturbations in two different ways, by the connected and one-particle-irreducible Green's functions. The lowest-order consistency relations are explicitly given, and we find that even in multi-field inflation the consistency relations in the soft limit are independent of the detail of the matter sector.

Original languageEnglish
Article number008
JournalJournal of Cosmology and Astroparticle Physics
Issue number2
StatePublished - 6 Feb 2018


  • cosmological perturbation theory
  • inflation
  • quantum field theory on curved space


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