Condensate of massive graviton and dark matter

Katsuki Aoki, Keiichi Maeda

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    We study coherently oscillating massive gravitons in the ghost-free bigravity theory. This coherent field can be interpreted as a condensate of the massive gravitons. We first define the effective energy-momentum tensor of the coherent massive gravitons in a curved spacetime. We then study the background dynamics of the Universe and the cosmic structure formation including the effects of the coherent massive gravitons. We find that the condensate of the massive graviton behaves as a dark matter component of the Universe. From the geometrical point of view the condensate is regarded as a spacetime anisotropy. Hence, in our scenario, dark matter is originated from the tiny deformation of the spacetime. We also discuss a production of the spacetime anisotropy and find that the extragalactic magnetic field of a primordial origin can yield a sufficient amount for dark matter.

    Original languageEnglish
    Article number044002
    JournalPhysical Review D
    Volume97
    Issue number4
    DOIs
    Publication statusPublished - 2018 Feb 1

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    gravitons
    condensates
    dark matter
    universe
    anisotropy
    ghosts
    kinetic energy
    tensors
    magnetic fields

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Condensate of massive graviton and dark matter. / Aoki, Katsuki; Maeda, Keiichi.

    In: Physical Review D, Vol. 97, No. 4, 044002, 01.02.2018.

    Research output: Contribution to journalArticle

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