Dark energy from cosmological fluids obeying a Shan-Chen non-ideal equation of state

Abstract

We consider a Friedmann-Robertson-Walker universe with a fluid source obeying a non-ideal equation of state with "asymptotic freedom," namely ideal gas behavior (pressure changes directly proportional to density changes) both at low and high density regimes, following a fluid dynamical model due to Shan and Chen. It is shown that, starting from an ordinary energy density component, such fluids naturally evolve towards a universe with a substantial "dark energy" component at the present time, with no need of invoking any cosmological constant. Moreover, we introduce a quantitative indicator of darkness abundance, which provides a consistent picture of the actual matter-energy content of the universe.

arXiv comment12 pages, 9 figures; published version

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• Shan--Chen interacting vacuum cosmology
• Cosmological Boundary Flux Parameter
• The interacting vacuum and tensions: a comparison of theoretical models
• On the uniqueness of $\Lambda$CDM-like evolution for homogeneous and isotropic cosmology in General Relativity
• Late-time evolution of cosmological models with fluids obeying a Shan-Chen-like equation of state
• Scalar field inflation and Shan-Chen fluid models
• Revisiting cosmological diffusion models in Unimodular Gravity and the $H_0$ tension