Interacting Two-Fluid Viscous Dark Energy Models In Non-Flat Universe

TL;DR

This paper investigates the evolution of dark energy in a non-flat universe with viscous fluids, showing that the universe can cross the phantom divide without singularities, aligning with recent observations.

Contribution

It introduces cosmological solutions for viscous dark energy models in non-flat universes, demonstrating crossing of the phantom region without big rip singularities.

Findings

Universe crosses the phantom region during evolution.

Dark energy equation of state varies from below to above -1.

No big rip singularity occurs in the models.

Abstract

We study the evolution of the dark energy parameter within the scope of a spatially non-flat and isotropic Friedmann-Robertson-Walker (FRW) model filled with barotropic fluid and bulk viscous stresses. We have obtained cosmological solutions which exhibit without a big rip singularity. It is concluded that in both non-interacting and interacting cases non-flat open universe crosses the phantom region. We find that during the evolution of the universe, the equation of state (EoS) for dark energy $\omega_{D}$ changes from $\omega^{eff}_{D} < -1$ to $\omega^{eff}_{D} > -1$, which is consistent with recent observations.