Role of Chameleon Field in Accelerating Universe

TL;DR

This paper investigates a flat FRW universe model with cold dark matter and Chameleon fields, analyzing intermediate and logamediate expansion scenarios to derive key cosmological parameters and their behaviors.

Contribution

It introduces a detailed analysis of Chameleon fields in different expansion scenarios, deriving expressions for potential and parameters, and illustrating their behaviors.

Findings

Potential decreases with Chameleon field in both scenarios

Slow-roll parameters are characterized diagrammatically

Expressions for key cosmological parameters are derived

Abstract

In this work, we have considered a model of the flat FRW universe filled with cold dark matter and Chameleon field where the scale function is taken as, (i) Intermediate Expansion and (ii) Logamediate Expansion. In the both cases we find the expressions of Chameleon field, Chameleon potential, statefinder parameters and slow-roll parameters. Also it has been shown that the potential is always decreases with the chameleon field in both the scenarios. The nature of slow-roll parameters have been shown diagrammatically.