Gauss-Bonnet modified gravity models with bouncing behavior

Anna Escofet, Emilio Elizalde

    Research output: Contribution to journalArticleResearchpeer-review

    13 Citations (Scopus)

    Abstract

    © 2016 World Scientific Publishing Company. The following issue is addressed: How the addition of a Gauss-Bonnet term (generically coming from most fundamental theories, as string and M theories), to a viable model, can change the specific properties, and even the physical nature, of the corresponding cosmological solutions? Specifically, brand new original dark energy models are obtained in this way with quite interesting properties, which exhibit, in a unified fashion, the three distinguished possible cosmological phases corresponding to phantom matter, quintessence and ordinary matter, respectively. A model, in which the equation of state (EoS) parameter, w, is a function of time, is seen to lead either to a singularity of the Big Rip kind or to a bouncing solution which evolves into a de Sitter universe with w = -1. Moreover, new Gauss-Bonnet modified gravity models with bouncing behavior in the early stages of the universe evolution are obtained and tested for the validity and stability of the corresponding solutions. They allow for a remarkably natural, unified description of a bouncing behavior at early times and accelerated expansion at present.
    Original languageEnglish
    Article number1650108
    JournalModern Physics Letters A
    Volume31
    Issue number17
    DOIs
    Publication statusPublished - 7 Jun 2016

    Keywords

    • accelerated expansion
    • bouncing behavior
    • cosmological singularities
    • Gauss-Bonnet models
    • Modified gravity

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