Viscous little rip cosmology

I. Brevik, E. Elizalde, S. Nojiri, S. D. Odintsov

    Research output: Contribution to journalArticleResearchpeer-review

    157 Citations (Scopus)

    Abstract

    Dark energy of phantom or quintessence nature with an equation of state parameter w almost equal to -1 often leads the universe evolution to a finite-time future singularity. An elegant solution to this problem has been recently proposed under the form of the so-called little rip cosmology, which appears to be a realistic alternative to the ΛCDM model. A viscous little rip cosmology is here proposed. Whereas generically bulk viscosity tends to promote the big rip, we find that there are a number of situations where this is not the case and where the formalism nicely adjusts itself to the little rip scenario. We prove, in particular, that a viscous fluid (or, equivalently, one with an inhomogeneous [imperfect] equation of state) is perfectly able to produce a little rip cosmology as a purely viscosity effect. The possibility of its induction as a combined result of viscosity and a general (powerlike) equation of state is also investigated in detail. To finish, a physical, inertial force interpretation of the dissolution of bound structures in the little rip cosmology is presented. © 2011 American Physical Society.
    Original languageEnglish
    Article number103508
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume84
    Issue number10
    DOIs
    Publication statusPublished - 4 Nov 2011

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