Massive gravitons as dark matter and gravitational waves

Katsuki Aoki, Shinji Mukohyama

    研究成果: Article査読

    52 被引用数 (Scopus)

    抄録

    We consider the possibility that the massive graviton is a viable candidate for dark matter in the context of bimetric gravity. We first derive the energy-momentum tensor of the massive graviton and show that it indeed behaves as that of dark matter fluid. We then discuss a production mechanism and the present abundance of massive gravitons as dark matter. Since the metric to which ordinary matter fields couple is a linear combination of the two mass eigenstates of bigravity, production of massive gravitons, i.e., the dark matter particles, is inevitably accompanied by generation of massless gravitons, i.e., the gravitational waves. Therefore, in this scenario some information about dark matter in our Universe is encoded in gravitational waves. For instance, if LIGO detects gravitational waves generated by the preheating after inflation, then the massive graviton with the mass of ∼0.01 GeV is a candidate for dark matter.

    本文言語English
    論文番号024001
    ジャーナルPhysical Review D
    94
    2
    DOI
    出版ステータスPublished - 2016 7月 1

    ASJC Scopus subject areas

    • 物理学および天文学(その他)

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