Particle creation inspired warm inflation according to Planck 2018

Abstract

In the present work, Chaplygin warm inflationary model is reformulated by assuming the universe as an open thermodynamic system which contains an interacting two component fluid. The scalar field decay and the particle creation due to energy transfer is the key feature of this model providing a baseline for the warm inflationary scenario. In the background of a spatially flat, isotropic and homogeneous universe, we obtain set of equations describing the evolution of dynamical variables by combining the formalism of irreversible thermodynamics and gravitational field equations. Regarding particle creation, the stress–energy tensor is redefined in order to include explicitly creation pressure term. For analyzing the role of inflationary scalar field potential, we take into account a constant potential and a Higgs-like potential. For each potential, the set of dynamical equations is numerically solved and its graphical analysis indicates that particle production gives rise to an accelerated universe during inflationary era, and then expanding universe starts decelerating showing that inflation has a graceful exit. Moreover, we determine the slow-roll and perturbed parameters with the inclusion of Higgs type potential. The graphical behavior of tensor–scalar ratio and scalar spectral is studied, and it is found that the models are in well agreement with Planck 2018 data in weak as well as in strong regimes.