期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2013/08/031
关键词
dark matter theory; cosmological neutrinos; string theory and cosmology
资金
- JSPS [24740135]
- World Premier International Center Initiative (WPI Program), MEXT, Japan
- Ministry of Education, Science, Sports, and Culture (MEXT), Japan [23104008, 23540283]
- [24111702]
- [21111006]
- [22244030]
- [21244033]
- Grants-in-Aid for Scientific Research [24111702, 22244030, 21111006, 24740135] Funding Source: KAKEN
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 O(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.
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