On the dual interpretation of zero-curvature Friedmann-Robertson-Walker models

TL;DR

This paper explores two interpretations of FRW cosmologies, analyzing the transition conditions from perfect fluid to dissipative regimes and highlighting the significance of a critical state in this process.

Contribution

It introduces a dual interpretation framework for FRW models and identifies the necessary conditions for phase transition between perfect and dissipative fluid regimes.

Findings

Transition from perfect to dissipative fluid requires specific conditions.

A critical point plays a key role in the transition process.

The dual interpretation offers new insights into cosmological phase changes.

Abstract

Two possible interpretations of FRW cosmologies (perfect fluid or dissipative fluid)are considered as consecutive phases of the system. Necessary conditions are found, for the transition from perfect fluid to dissipative regime to occur, bringing out the conspicuous role played by a particular state of the system (the ''critical point '').