期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 1, 页码 1-22出版社
SPRINGER
DOI: 10.1007/JHEP01(2015)006
关键词
Beyond Standard Model; Cosmology of Theories beyond the SM; Neutrino Physics
资金
- Australian Research Council
- Chulalongkorn University through Ratchadapisek Sompote Endowment Fund
Sterile neutrinos with a mass of a few keV can serve as cosmological warm dark matter. We study the production of keV sterile neutrinos in the early universe from the decay of a frozen-in scalar. Previous studies focused on heavy frozen-in scalars with masses above the Higgs mass leading to a hot spectrum for sterile neutrinos with masses below 8 - 10 keV. Motivated by the recent hints for an X-ray line at 3.55 keV, we extend the analysis to lighter frozen-in scalars, which allow for a cooler spectrum. Below the electroweak phase transition, several qualitatively new channels start contributing. The most important ones are annihilation into electroweak vector bosons, particularly W -bosons as well as Higgs decay into pairs of frozen-in scalars when kinematically allowed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据