Unified universe history through phantom extended Chaplygin gas

TL;DR

This paper presents a unified cosmological model combining extended Chaplygin gas and a phantom scalar field to describe universe evolution from inflation to late-time acceleration, analyzing solutions, stability, and perturbations.

Contribution

It introduces a novel two-component fluid model that unifies different cosmic eras and explores bouncing solutions and perturbation stability.

Findings

Successful modeling of universe evolution from inflation to acceleration

Identification of bouncing solutions within the model

Predictions for tensor-to-scalar ratio consistent with observations

Abstract

We investigate the universe evolution from inflation to late-time acceleration in a unified way, using a two-component fluid constituted from extended Chaplygin gas alongside a phantom scalar field. We extract solutions for the various cosmological eras, focusing on the behavior of the scale factor, the various density parameters and the equation-of-state parameter. Furthermore, we extract and discuss bouncing solutions. Finally, we examine the perturbations of the model, ensuring about their stability and extracting the predictions for the tensor-to-scalar ratio.