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- W1977614042 abstract "We study the second-order gauge-invariant adiabatic and isocurvature perturbations in terms of the scalar fields present during inflation, along with the related fully non-linear space gradient of these quantities. We discuss the relation with other perturbation quantities defined in the literature. We also construct the exact cubic action of the second-order perturbations (beyond any slow-roll or super-horizon approximations and including tensor perturbations), both in the uniform energy density gauge and the flat gauge in order to settle various gauge-related issues. We thus provide the tool to calculate the exact non-Gaussianity beyond slow-roll and at any scale." @default.
- W1977614042 created "2016-06-24" @default.
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- W1977614042 date "2012-08-21" @default.
- W1977614042 modified "2023-09-24" @default.
- W1977614042 title "Gauge-invariant perturbations at second order in two-field inflation" @default.
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- W1977614042 doi "https://doi.org/10.1088/1475-7516/2012/08/023" @default.
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