Constraints on warm power-law inflation in light of Planck results

TL;DR

This paper investigates constraints on warm power-law inflation models using Planck data, identifying parameter regions consistent with observations and analyzing different dissipative regimes to reconcile theory with cosmic microwave background measurements.

Contribution

It provides a comprehensive analysis of parameter constraints in warm inflation models considering both weak and strong dissipative regimes, aligning theoretical predictions with Planck observational data.

Findings

Identified parameter regions compatible with Planck data.

Analyzed weak and strong dissipative regimes separately.

Achieved better agreement between theory and observations.

Abstract

The constraints on a general form of the power-law potential and the dissipation coefficient in the framework of warm single field inflation imposed by Planck data will be investigated. {By Considering a quasi-static Universe, besides a slow-roll condition, the suitable regions in which a pair of theoretical free parameters are in good agreement with Planck results will be estimated}. In this method instead of a set of free parameters, we can visualize a region of free parameters that can satisfy the precision limits on theoretical results. On the other side, when we consider the preformed quantity for the amplitude of scalar perturbations, the conflict between obtained results for free parameters in different steps dramatically will be decreased. {As have done in prominent} literature, based on the friction of the environment, we can divide the primordial Universe to the two different epochs namely weak and strong dissipative regimes. For the aforementioned eras, the free parameters of the model will be constrained and the best regions will be obtained. To do so, the main inflationary observables such as tensor-to-scalar ratio, power-spectra of density perturbations and gravitational waves, scalar and tensor spectral indices, running spectral index and the number of e-folds in both weak and strong regimes will be obtained. Ultimately, it can be visualized, this model can make concord between theoretical results and data originated from cosmic microwave background and Planck $2013$, $2015$ and $2018$.