Self-interacting Dark Radiation
Self-interacting Dark Radiation
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自相互作用暗辐射
DOI：
10.1016/j.physletb.2013.07.001
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Fuminobu Takahashi
中科院分区：
文献类型：
--
作者：
Kwang Sik Jeong; Fuminobu Takahashi
We consider a simple class of models where dark radiation has self-interactions and therefore does not free stream. Such dark radiation has no anisotropic stress (or viscosity), leaving a distinct signature on the CMB angular power spectrum. Specifically we study a possibility that hidden gauge bosons and/or chiral fermions account for the excess of the effective number of neutrino species. They have gauge interactions and remain light due to the unbroken hidden gauge symmetry, leading to Δ N eff≃ 0.29 in some case.
