Irreversible processes and the accelerated-decelerated phases of the Universe
AUTOR(ES)
Kremer, G. M., Silva, M. C. N. Teixeira da
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2004-09
RESUMO
A model for the Universe is proposed where it is considered as a mixture of scalar and matter fields. The particle production is due to an irreversible transfer of energy from the gravitational field to the matter field and represented by a non-equilibrium pressure. This model can simulate three distinct periods of the Universe: (a) an accelerated epoch where the energy density of the scalar field prevails over that of the matter field, (b) a past decelerated period where the energy density of the matter field becomes larger than the scalar field energy density, and (c) a present acceleration phase where the scalar field energy density overcomes the energy density of the matter field.
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