2017-07-10

UTAPwiki/セミナー/初期宇宙・相対論速報
Speaker: Katsuki Aoki (Waseda Univ.)
Title: condensate of massive graviton as dark matter
Abstract:
We study coherently oscillating massive gravitons in the ghost-free bigravity theory. This coherent field could be interpreted as a "condensate" of the massive gravitons, or it is regarded as a spacetime anisotropy from the geometrical point of view. We present that the condensate of massive graviton (or the spacetime anisotropy) is a viable candidate for dark matter. 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 of dark matter.