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000600392 1001_ $$0P:(DE-H253)PIP1010796$$aCicoli, Michele$$b0$$eCorresponding author$$udesy
000600392 245__ $$aOn the choice of entropy variables in multifield inflation
000600392 260__ $$aBristol$$bIOP Publ.$$c2023
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000600392 520__ $$aWe 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.
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000600392 650_7 $$2INSPIRE$$aentropy: perturbation
000600392 650_7 $$2INSPIRE$$ainflation: model
000600392 650_7 $$2INSPIRE$$aisocurvature: perturbation
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000600392 650_7 $$2INSPIRE$$areheating
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000600392 650_7 $$2autogen$$amultifield inflation
000600392 650_7 $$2autogen$$aisocurvature modes
000600392 650_7 $$2autogen$$aentropy perturbations
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000600392 7001_ $$0P:(DE-H253)PIP1087239$$aGuidetti, Veronica$$b1$$udesy
000600392 7001_ $$0P:(DE-H253)PIP1091885$$aMuia, Francesco$$b2$$udesy
000600392 7001_ $$0P:(DE-H253)PIP1018307$$aPedro, Francisco G.$$b3$$udesy
000600392 7001_ $$aVacca, Gian Paolo$$b4
000600392 773__ $$0PERI:(DE-600)1473117-4$$a10.1088/1361-6382/acabf7$$gVol. 40, no. 2, p. 025008 -$$n2$$p025008 $$tClassical and quantum gravity$$v40$$x0264-9381$$y2023
000600392 7870_ $$0PUBDB-2021-02869$$aCicoli, Michele et.al.$$d2021$$iIsParent$$rDESY-21-106 ; arXiv:2107.03391$$tOn the choice of entropy variables in multifield inflation
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