2003 **Abstract:** 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 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 ͑a͒ an inflationary period where the acceleration grows exponentially and the van der Waals fluid behaves like an inflaton, ͑b͒ an …

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“…As it is well known, the perfect fluid EoS is only a crude approximation of a real fluid that is usually used in cosmology since it represents the simplest way to fit the available data. However, as first shown in the Van der Waals quintessence scenario [29,30] and further demonstrated here, abandoning the perfect fluid EoS still makes it possible to fit the available astrophysical data with the same accuracy so that the use of realistic EoS turns out to be motivated also a posteriori. In our opinion, the era of precision cosmology calls for precision theory so that time is come to abandon approximate description such as the perfect fluid one.…”

confidence: 99%

“…The Van der Waals EoS reduces to the perfect fluid case in the limit α, β → 0. The dynamics of the corresponding cosmological model has been yet investigated both in the framework of UDE models [29] and as a dark energy fluid [30] so that we do not consider it again here. On the other hand, there are other EoS that are worth investigating.…”

confidence: 99%

“…The success of this model has stimulated several different approaches. Recently, a model with a binary mixture whose constituents are described by a VDW fluid and by a dark energy density was also proposed [5]. It is interesting to note that this model can simulate several aspects, namely, an inflationary period where the acceleration grows exponentially; and a present accelerated period where the dark energy density dominates over the energy density of the VDW fluid.…”

confidence: 99%

“…• Exotic equation of state: a linear equation of state [8], van der Waals equation of state [9,10], Chaplygin gas [11][12][13], generalized Chaplygin gas [14,15], modified Chaplygin gas [16,17], superfluid Chaplygin gas [18][19][20], inhomogeneous equation of state [21], barotropic fluid model [22], Cardassian model [23][24][25][26].…”

confidence: 99%