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.

12 pages, 9 figures; published version

References in corpus (3)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• Reconstructing Dark Energy

Cited by in corpus (6)

• Cosmological evolution with quadratic gravity and nonideal fluids
• Shan--Chen interacting vacuum cosmology
• 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
• Cosmological Boundary Flux Parameter
• Revisiting cosmological diffusion models in Unimodular Gravity and the $H_0$ tension