Dark energy from cosmological fluids obeying a Shan-Chen nonideal equation of state
2013 (English)In: Physical Review D, ISSN 1550-7998, Vol. 88, no 6, 063007- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2013. Vol. 88, no 6, 063007- p.
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-94731DOI: 10.1103/PhysRevD.88.063007ISI: 000324237800001OAI: oai:DiVA.org:su-94731DiVA: diva2:655133
EACEA of the European Commission 2011-1640 2013-10-102013-10-092014-09-04Bibliographically approved