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

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.

Automated summary

This work studied the interacting Umami Chaplygin gas in the flat FRW model of the universe, focusing on its thermodynamic and dynamical behaviors. By analyzing the model parameters, some interesting critical points were found to alleviate the coincidence problem.