Self-interacting dark radiation

被引：30

作者：

Jeong, Kwang Sik ^{[1
]}

Takahashi, Fuminobu ^{[1
,2
]}

机构：

[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[2] Univ Tokyo, TODIAS, Kavli IPMU, Kashiwa, Chiba 2778583, Japan

来源：

PHYSICS LETTERS B | 2013年 / 725卷 / 1-3期

关键词：

D O I：

10.1016/j.physletb.2013.07.001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 Delta N-eff similar or equal to 0.29 in some case. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：134 / 138

页数：5

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