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- W4287083604 abstract "We discuss the usefulness and theoretical consistency of different entropy variables used in the literature to describe isocurvature perturbations in multifield inflationary models with a generic curved field space. We clarify which is the proper entropy variable to be used to match the evolution of isocurvature modes during inflation to the one after the reheating epoch in order to compare with observational constraints. In particular, we find that commonly used variables, as the relative entropy perturbation or the one associated to the decomposition in tangent and normal perturbations with respect to the inflationary trajectory, even if more useful to perform numerical studies, can lead to results which are wrong by several orders of magnitude, or even to apparent destabilisation effects which are unphysical for cases with light kinetically coupled spectator fields." @default.
- W4287083604 created "2022-07-25" @default.
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- W4287083604 date "2021-07-07" @default.
- W4287083604 modified "2023-09-27" @default.
- W4287083604 title "On the choice of entropy variables in multifield inflation" @default.
- W4287083604 doi "https://doi.org/10.48550/arxiv.2107.03391" @default.
- W4287083604 hasPublicationYear "2021" @default.
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