Cosmological models described by a mixture of van der Waals fluid and dark energy

Details Cosmological models described by a mixture of van der Waals fluid and dark energy Cosmological models described by a mixture of van der Waals fluid and dark energy

2003-09-23

arxiv.org/abs/gr-qc/0309111v1

Phys.Rev. D68 (2003) 123507

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, 5 figures. To be published in Physical Review D

Scientific paper

10.1103/PhysRevD.68.123507

The Universe is modeled as a binary mixture whose constituents are described by a van der Waals fluid and by a dark energy density. The dark energy density is considered either as the quintessence or as the Chaplygin gas. The irreversible processes concerning the energy transfer between the van der Waals fluid and the gravitational field are taken into account. This model can simulate: (a) an inflationary period where the acceleration grows exponentially and the van der Waals fluid behaves like an inflaton; (b) an inflationary period where the acceleration is positive but it decreases and tends to zero whereas the energy density of the van der Waals fluid decays; (c) a decelerated period which corresponds to a matter dominated period with a non-negative pressure; and (d) a present accelerated period where the dark energy density outweighs the energy density of the van der Waals fluid.

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