Dynamical analysis of interacting dark energy model in the framework of particle creation mechanism

TL;DR

This paper investigates the cosmological dynamics of interacting dark energy models within a particle creation framework, revealing scenarios like late-time acceleration, phantom crossing, and mimicking various dark energy behaviors through dynamical systems analysis.

Contribution

It introduces a novel approach by incorporating particle creation into dark energy models and analyzes their complex dynamics using dynamical systems methods.

Findings

Late-time universe dominated by dark energy with quintessence, cosmological constant, or phantom characteristics.

Possibility of crossing the phantom divide line, aligning with observational data.

Dynamical analysis reveals diverse cosmological scenarios driven by particle creation effects.

Abstract

In this work we present the cosmological dynamics of interacting dark energy models in the framework of particle creation mechanism. The particle creation mechanism presented here describes the true non equilibrium thermodynamics of the universe. In spatially flat Friedmann-Lema{\^\i}tre-Robertson-Walker universe considered here, the dissipative bulk viscous pressure is due to the non conservation of particle number. For simplicity, we assume that the creation of perfect fluid particles to be isentropic (adiabatic) and consequently the viscous pressure obeys a linear relationship with particle creation rate. Due to complicated nature of the Einstein's field equations, dynamical systems analysis has been performed to understand deeply about the cosmological dynamics. We have found some interesting cosmological scenarios like late-time evolution of universe dominated by dark energy which could mimic quintessence, cosmological constant or phantom field through a dark matter dominated era. We also obtained a possibility of crossing the phantom divide line which is favored by observations.