Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2002-12-11
Phys.Rev. D67 (2003) 047301
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
7 pages, latex file, 1 figure. To appear in PRD
Scientific paper
10.1103/PhysRevD.67.047301
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.
Devecchi Fernando P.
Kremer Gilberto M.
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