TY  - JOUR
AU  - Cicoli, Michele
AU  - Guidetti, Veronica
AU  - Muia, Francesco
AU  - Pedro, Francisco G.
AU  - Vacca, Gian Paolo
TI  - On the choice of entropy variables in multifield inflation
JO  - Classical and quantum gravity
VL  - 40
IS  - 2
SN  - 0264-9381
CY  - Bristol
PB  - IOP Publ.
M1  - PUBDB-2023-07949
M1  - arXiv:2107.03391
M1  - DESY-21-106
SP  - 025008 
PY  - 2023
N1  - 20 pages + appendices, 3 figures
AB  - 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.
KW  - entropy: perturbation (INSPIRE)
KW  - inflation: model (INSPIRE)
KW  - isocurvature: perturbation (INSPIRE)
KW  - trajectory (INSPIRE)
KW  - reheating (INSPIRE)
KW  - spectator (INSPIRE)
KW  - curvature (INSPIRE)
KW  - stability (INSPIRE)
KW  - coupling (INSPIRE)
KW  - kinetic (INSPIRE)
KW  - multifield inflation (autogen)
KW  - isocurvature modes (autogen)
KW  - entropy perturbations (autogen)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000905279400001
DO  - DOI:10.1088/1361-6382/acabf7
UR  - https://bib-pubdb1.desy.de/record/600392
ER  -