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Abstract:
We consider a Friedmann-Robertson-Walker universe with a fluid source obeying a nonideal 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.
