“…Once again, we see that the choice of basis and operators to analyse the state of the system is crucial. For cosmological perturbations, several pointer basis were considered: coherent state basis [96,35], field amplitude basis [97,98,93,94], number basis [97], and others [99] 19 . Ultimately, in a realistic model, the pointer basis is given by the eigenstates of the interaction Hamiltonian selected.…”