Cosmology in ghost-free bigravity theory with twin matter fluids: The origin of dark matter

Katsuki Aoki, Keiichi Maeda

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    We study dynamics of Friedmann-Lemaître-Robertson-Walker (FLRW) spacetime based on the ghost-free bigravity theory. Assuming the coupling parameters guaranteeing the existence of de Sitter space as well as Minkowski spacetime, we find two stable attractors for spacetime with "twin" dust matter fields: One is de Sitter accelerating universe and the other is matter dominated universe. Although a considerable number of initial data leads to de Sitter universe, we also find matter dominated universe or spacetime with a future singularity for some initial data. The cosmic no-hair conjecture does not exactly hold, but the accelerating expansion can be found naturally. The Λ-CDM model is obtained as an attractor. We also show that the dark matter component in the Friedmann equation, which originates from another twin matter, can be about 5 times larger than the baryonic matter, by choosing the appropriate coupling constants.

    Original languageEnglish
    Article number064051
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Issue number6
    Publication statusPublished - 2014 Mar 20


    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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