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On second-order superhorizon perturbations in multifield inflationary models. (English) Zbl 1056.83033
This paper deals with second-order perturbations in multifield inflationary models with nontrivial kinetic terms. The splitting of isocurvature and adiabatic perturbations is obtained through geometrical means. An application is given to a two-field model with a diagonal but otherwise arbitrary metric. The formalism is also useful to calculate the amount of non-Gaussianity produced in these models.

MSC:
83F05 Relativistic cosmology
83C30 Asymptotic procedures (radiation, news functions, \(\mathcal{H} \)-spaces, etc.) in general relativity and gravitational theory
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