Warm intermediate inflation in f (R) gravity

This paper investigates the behavior of warm intermediate inflation for flat isotropic and homogeneous universe in Einstein frame representation of f (R) gravity. In this scenario, we study the dynamics of two distinct regimes, i.e., strong and weak constant as well as generalized dissipative regimes. In both regimes, we find inflaton solution corresponding to scalar potential and then evaluate dimensionless slow-roll parameters. Under slow-roll approximation, we formulate scalar and tensor power spectra, their spectral indices and tensor-scalar ratio for Starobinsky inflationary model and study the graphical analysis of these observational parameters. It is concluded that isotropic intermediate inflationary model with constant as well as generalized dissipation coefficient for m = 0, 1 and -1 remains compatible with Planck 2015 constraints in both dissipative regimes. The inflationary model satisfies warm inflation condition in both dissipation regimes but found to be inconsistent for m = 3.