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

Bini, Donato; Geralico, Andrea; Gregoris, Daniele

doi:10.1103/PhysRevD.88.063007

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

MPG-Autoren

Gregoris, Daniele
AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Zitation

Bini, D., Geralico, A., & Gregoris, D. (2013). Dark energy from cosmological fluids obeying a Shan-Chen nonideal equation of state. Physical Review D, 88: 063007. doi:10.1103/PhysRevD.88.063007.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0015-1316-8

Zusammenfassung

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.