Viscous cosmological models and accelerated Universes

Abstract

It is shown that a present acceleration with a past deceleration is a possible solution of the Friedmann equation by considering the Universe as a mixture of a scalar with a matter field and by including a non-equilibrium pressure term in the energy-momentum tensor. The dark energy density decays more slowly with respect to the time than the matter energy density does. The inclusion of the non-equilibrium pressure leads to a less pronounced decay of the matter field with a shorter period of past deceleration.

7 pages, latex file, 1 figure. To appear in PRD

References in corpus (1)

• Irreversible Processes in Inflationary Cosmological Models

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