TY - JOUR
T1 - Action approach to cosmological perturbations
T2 - The second-order metric in matter dominance
AU - Boubekeur, Lotfi
AU - Creminelli, Paolo
AU - Norẽa, Jorge
AU - Vernizzi, Filippo
PY - 2008/8/1
Y1 - 2008/8/1
N2 - 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.
AB - 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.
KW - Cosmological perturbation theory
KW - Inflation
KW - Physics of the early universe
UR - http://www.scopus.com/inward/record.url?scp=56349168506&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2008/08/028
DO - 10.1088/1475-7516/2008/08/028
M3 - Article
AN - SCOPUS:56349168506
SN - 1475-7516
VL - 2008
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 8
M1 - 028
ER -