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

Lotfi Boubekeur, Paolo Creminelli, Jorge Norẽa, Filippo Vernizzi

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49 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Número de artículo028
PublicaciónJournal of Cosmology and Astroparticle Physics
Volumen2008
N.º8
DOI
EstadoPublicada - 1 ago. 2008
Publicado de forma externa

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