Massive graviton dark matter with environment dependent mass: A natural explanation of the dark matter-baryon ratio

Katsuki Aoki, Shinji Mukohyama

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    6 Citations (Scopus)

    Abstract

    We propose a scenario that can naturally explain the observed dark matter-baryon ratio in the context of bimetric theory with a chameleon field. We introduce two additional gravitational degrees of freedom, the massive graviton and the chameleon field, corresponding to dark matter and dark energy, respectively. The chameleon field is assumed to be nonminimally coupled to dark matter, i.e., the massive graviton, through the graviton mass terms. We find that the dark matter-baryon ratio is dynamically adjusted to the observed value due to the energy transfer by the chameleon field. As a result, the model can explain the observed dark matter-baryon ratio independently from the initial abundance of them.

    Original languageEnglish
    Article number104039
    JournalPhysical Review D
    Volume96
    Issue number10
    DOIs
    Publication statusPublished - 2017 Jan 1

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    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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