文献类型：期刊文献

英文题名：keV scale ν_R dark matter and its detection in β decay experiments

作者：Liao, Wei[1,2]

机构：[1]E China Univ Sci & Technol, Inst Modern Phys, Shanghai 200237, Peoples R China;[2]Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China

年份：2010

卷号：82

期号：7

外文期刊名：PHYSICAL REVIEW D

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000282570100002)】；

基金：I would like to thank A. Yu. Smirnov for his encouragement. This work is supported by the Science and Technology Commission of Shanghai Municipality under Contract No. 09PJ1403800 and by the National Science Foundation of China (NSFC), Grant No. 10975052.

语种：英文

摘要：We study dark matter (DM) in the model with one keV scale right-handed neutrino nu(R1) and two GeV scale right-handed neutrinos nu(R2,3), the nu SM. We find that one of the GeV scale right-handed neutrinos can have a much longer lifetime than the other when two GeV scale right-handed neutrinos are degenerate. We show that the mass and mixing of light neutrinos can be explained in this case. Significant entropy release can be generated in a reheating produced by the decay of one of the GeV scale nu(R). The density of nu(R1) DM can be diluted by 2 orders of magnitude, and the mixing of nu(R1) with active neutrinos is allowed to be much larger, reaching the bound from x-ray observation. This mixing can lead to a sizable rate of nu(R1) capture by radioactive nuclei. The nu(R1) capture events are mono-energetic electrons with keV scale energy away from the beta decay spectrum. This is a new way to detect DM in the Universe.