Fully non-linear equivalence of delta N and covariant formalisms
classification
🌌 astro-ph.CO
gr-qchep-phhep-th
keywords
curvaturecovariantfullynon-lineardeltaequivalenceformalismformalisms
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We explicitly show the fully non-linear equivalence of the $\delta$N and the covariant formalisms for the superhorizon curvature perturbations, which enables us to safely evaluate the non-Gaussian quantities of the curvature perturbation in either formalism. We also discuss isocurvature perturbations in the covariant formalism and clarify the relation between the fully non-linear evolution of the curvature covector and that of the curvature perturbation for multiple interacting fluids.
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