Abstract

In this work, we review the composite dynamics in various models which can be efficiently used to study the mechanism of cosmic inflation. In the framework of single-field inflationary models, we consider the inflaton field emerging as a bound state stemming solely from the underlying fermionic degrees of freedom in various composite theories. Moreover, we constrain the number of e-foldings for composite models of inflation to obtain successful inflation and satisfy the observational data from Planck 2018, simultaneously. In addition, a set of cosmological parameters, e.g., the primordial spectral index n<inf>s</inf> and tensor-to-scalar ratio r, is constrained using the results reported by Planck 2018.