Action approach to cosmological perturbations: The second-order metric in matter dominance

Lotfi Boubekeur, Paolo Creminelli, Jorge Norẽa, Filippo Vernizzi

Research output: Contribution to journalArticlepeer-review

Abstract

We study nonlinear cosmological perturbations during post-inflationary evolution, using the equivalence between a perfect barotropic fluid and a derivatively coupled scalar field with Lagrangian . Since this Lagrangian is just a special case of k-inflation, this approach is analogous to the one employed in the study of non-Gaussianities from inflation. We use this method to derive the second-order metric during matter dominance in the comoving gauge directly as a function of the primordial inflationary perturbation ζ. Going to Poisson gauge, we recover the metric previously derived in the literature.

Original languageEnglish
Article number028
JournalJournal of Cosmology and Astroparticle Physics
Volume2008
Issue number8
DOIs
StatePublished - 1 Aug 2008
Externally publishedYes

Keywords

  • Cosmological perturbation theory
  • Inflation
  • Physics of the early universe

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