A covariant approach to general field space metric in multi-field inflation

Jinn Ouk Gong, Takahiro Tanaka

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

We present a covariant formalism for general multi-field system which enables us to obtain higher order action of cosmological perturbations easily and systematically. The effects of the field space geometry, described by the Riemann curvature tensor of the field space, are naturally incorporated. We explicitly calculate up to the cubic order action which is necessary to estimate non-Gaussianity and present those geometric terms which have not yet been known before.

Original languageEnglish
Article number015
JournalJournal of Cosmology and Astroparticle Physics
Volume2011
Issue number3
DOIs
StatePublished - Mar 2011

Keywords

  • cosmological perturbation theory
  • inflation
  • physics of the early universe

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