Phase Space Analysis and Thermodynamics of Interacting Umami Chaplygin gas in FRW Universe

TL;DR

This paper explores the thermodynamic and dynamical properties of an interacting Umami Chaplygin gas in a flat FRW universe, revealing critical points that explain late-time acceleration and address the coincidence problem.

Contribution

It introduces a novel analysis of interacting Umami Chaplygin gas as dark energy, combining thermodynamics and dynamical systems to identify cosmologically relevant critical points.

Findings

Identification of critical points indicating late-time acceleration

Existence of accelerated scaling attractors in quintessence era

Alleviation of the coincidence problem through model parameters

Abstract

In this work interacting Umami Chaplygin gas has been studied in flat FRW model of universe in context of it's thermodynamic and dynamical behaviour. In particular, considering Umami fluid as dark energy interacting with dark matter, irreversible thermodynamics has been studied both for apparent and event horizon as bounding horizon in two separate cases. Also the model has been investigated in purview of dynamical systems analysis by converting the cosmological evolution equations to an autonomous system of ordinary differential equations. With some restrictions on model parameter $\omega$ and coupling parameter $\lambda$, some cosmologically interesting critical points describing late time accelerated evolution of the universe attracted by cosmological constant and accelerated scaling attractor in quintessence era have been found to alleviate coincidence problem.