Intermediate inflation in a generalized induced-gravity scenario

An intermediate inflationary Universe model in the context of non-minimal coupling to the scalar curvature is analyzed. We will conduct our analysis in the slow-roll approximation of the inflationary dynamics and the cosmological perturbations considering a coupling of the form \(F(\varphi )=\kappa +\xi _n\varphi ^n\). Considering the trajectories in the r–\(n_s\) plane from the Planck data, we find the constraints on the parameter space in our model.