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

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 '').

13 pages Latex, to appear in Class.Quantum Grav

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