Condensate of massive graviton and dark matter

Katsuki Aoki, Kei Ichi Maeda

研究成果: Article査読

14 被引用数 (Scopus)


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.

ジャーナルPhysical Review D
出版ステータスPublished - 2018 2月 1

ASJC Scopus subject areas

  • 物理学および天文学(その他)


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