The van der Waals fluid and its role in cosmology

Abstract

We analyze the properties of a generic cosmological fluid described by the van der Waals equation of state. Exact solutions for the energy density evolution are found as implicit functions of the scale factor for a flat Friedmann-Robertson-Walker space-time. The possible values of the free parameter in the van der Waals equation are selected \emph{a posteriori}, in accordance with asymptotic behaviors that are physically relevant. The stability of the model against small perturbations is studied through the hydrodynamic perturbations of the fluid for the relevant cases. It is found that a van der Waals fluid seems appropriate to describe non-eternal inflationary scenarios.

arXiv comment8 pages, 2 figures, left and right frames of fig.1 were not in the correct order as was explained in the text

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• Dynamical Analysis of an $n-H-T$ Cosmological Quintessence Real Gas Model with a General Equation of State
• Thermodynamic analysis for Non-linear system (Van-der-Waals EOS) with viscous cosmology
• Thermodynamics and energy condition analysis for Van-Der-Waals EOS without viscous cosmology
• Inflationary Constraints on the Van der Waals Equation of State
• Singularity Avoidance in Gravitational Collapse of an Inhomogeneous Fluid in Rastall Gravity