Double inflation via non-minimally coupled spectator

Abstract We argue that double inflation may occur when a spectator field is non-minimally coupled to gravity. As concrete example, we study two-field inflationary model where the initial gravity while inflaton minimally coupled. The non-minimal coupling results in growth of which, turn, drives second stage significant region parameter space. isocurvature fluctuations originating from source adiabatic ones, and hence can modify predictions for spectral index tensor-to-scalar ratio even though explicitly show quadratic chaotic become viable by introduction coupling.