Dark radiation and small-scale structure problems with decaying particles

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Although the standard ACDM model describes the cosmic microwave background radiation and the large-scale structure of the Universe with great success, it has some tensions with observations in the effective number of neutrino species (dark radiation) and the number of small-scale structures (overabundance problem). Here we propose a scenario which can relax these tensions by producing both dark matter and dark radiation by late decays of heavy particles. Thanks to the generation mechanism, dark matter is rather warm, so that the small-scale structure problem is resolved. This scenario can be naturally realized in the supersymmetric axion model, in which axions produced by saxion decays provide dark radiation, while axinos from saxion decays form warm dark matter. We identify a parameter region of the supersymmetric axion model satisfying all known cosmological constraints.
Publisher
AMER PHYSICAL SOC
Issue Date
2012-10
Language
English
Article Type
Article
Keywords

STRONG CP PROBLEM; PRIMORDIAL NUCLEOSYNTHESIS; POWER SPECTRUM; MATTER; GALAXIES; INVARIANCE; TELESCOPE; UNIVERSE; LIGHT; AXION

Citation

PHYSICAL REVIEW D, v.86, no.8

ISSN
1550-7998
DOI
10.1103/PhysRevD.86.083529
URI
http://hdl.handle.net/10203/104616
Appears in Collection
PH-Journal Papers(저널논문)
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