A parallel world in the dark

Tetsutaro Higaki, Kwang Sik Jeong, Fuminobu Takahashi

研究成果: Article査読

18 被引用数 (Scopus)


The baryon-dark matter coincidence is a long-standing issue. Interestingly, the recent observations suggest the presence of dark radiation, which, if confirmed, would pose another coincidence problem of why the density of dark radiation is comparable to that of photons. These striking coincidences may be traced back to the dark sector with particle contents and interactions that are quite similar, if not identical, to the standard model: a dark parallel world. It naturally solves the coincidence problems of dark matter and dark radiation, and predicts a sterile neutrino(s) with mass of (0.1-1) eV, as well as self-interacting dark matter made of the counterpart of ordinary baryons. We find a robust prediction for the relation between the abundance of dark radiation and the sterile neutrino, which can serve as the smoking-gun evidence of the dark parallel world.

ジャーナルJournal of Cosmology and Astroparticle Physics
出版ステータスPublished - 2013 8月

ASJC Scopus subject areas

  • 天文学と天体物理学


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