Observational predictions of some inflationary models

This paper presents the CMB angular power spectrum obtained using the CAMB code for three different models of inflation: the Starobinsky inflationary model, the generalized Starobinsky inflationary model, and the chaotic inflationary model with a step. The results are compared with the most recent data reported for the Planck mission. An analysis of the large ($\ell \lesssim 90$), intermediate ($90\lesssim \ell \lesssim 900$), and small ($\ell \gtrsim 900$) angular scales is performed. We report the position of the peaks in the intermediate region so as the cosmological parameters obtained in each of the models: age of the universe, ${\Omega }_m$, ${\Omega }_b$, ${\Omega }_{\Lambda }$, ${\Omega }_K$ and $n_S$. We also perform a Bayesian analysis using the Cobaya code to evaluate our three best-fitting models. Additionally, we generated contour plots $(n_S,r)$ for our inflationary models, taking into account the number of e–folds between the end of inflation and the completion of reheating.