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

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1316-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1317-6
Genre: Journal Article

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PRD88_063007.pdf (Any fulltext), 820KB
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 Creators:
Bini, Donato, Author
Geralico, Andrea, Author
Gregoris, Daniele1, Author
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1AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, escidoc:24008              

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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.

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 Dates: 2013
 Publication Status: Published in print
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 Identifiers: DOI: 10.1103/PhysRevD.88.063007
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 88 Sequence Number: 063007 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111088197762258