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.

Cicoli, M., Guidetti, V., Muia, F., Pedro, F.G., Paolo Vacca, G. (2022). On the choice of entropy variables in multifield inflation. CLASSICAL AND QUANTUM GRAVITY, 40(2), 1-26 [10.1088/1361-6382/acabf7].

On the choice of entropy variables in multifield inflation

Cicoli, Michele
Membro del Collaboration Group
;
Pedro, Francisco G
Membro del Collaboration Group
;
2022

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.
2022
Cicoli, M., Guidetti, V., Muia, F., Pedro, F.G., Paolo Vacca, G. (2022). On the choice of entropy variables in multifield inflation. CLASSICAL AND QUANTUM GRAVITY, 40(2), 1-26 [10.1088/1361-6382/acabf7].
Cicoli, Michele; Guidetti, Veronica; Muia, Francesco; Pedro, Francisco G; Paolo Vacca, Gian
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/915466
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