On the choice of entropy variables in multifield inflation

Cicoli, Michele; Muia, Francesco; Guidetti, Veronica; Pedro, Francisco; Paolo, Vacca Gian

Preprint

PUBDB-2021-02869

On the choice of entropy variables in multifield inflation

Cicoli, M. ; Guidetti, V. (Corresponding author)DESY* ; Muia, F. ; Pedro, F. ; Paolo, V. G.

2021

[10.3204/PUBDB-2021-02869]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2021-02869

Report No.: DESY-21-106; arXiv:2107.03391

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.

Keyword(s): entropy, perturbation ; inflation, model ; isocurvature, perturbation ; trajectory ; reheating ; spectator

Classification:

ddc:530

Contributing Institute(s):

Theorie-Gruppe (T)

Research Program(s):

611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

No specific instrument

Appears in the scientific report 2021

Database coverage:
Medline

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