An Interacting Two-Fluid Scenario for Dark Energy in FRW Universe

TL;DR

This paper investigates the evolution of dark energy in a flat FRW universe with a specific scale factor, analyzing both non-interacting and interacting scenarios to understand its dynamic behavior.

Contribution

It introduces a novel scale factor choice leading to a time-dependent deceleration parameter and explores dark energy evolution with and without interaction.

Findings

Dark energy parameter evolves dynamically over time.

Interaction affects the behavior of dark energy.

Deceleration parameter varies with time, indicating acceleration phases.

Abstract

We study the evolution of the dark energy parameter within the scope of a spatially flat and isotropic Friedmann-Robertson-Walker (FRW) model filled with barotropic fluid and dark energy. To obtain the deterministic solution we choose the scale factor $a(t) = \sqrt{t e^{t}}$ which yields a time dependent deceleration parameter (DP). In doing so we consider the case minimally coupled with dark energy to the perfect fluid as well as direct interaction with it.