论文标题
无菌中微子寿命的界限和通过全局21 cm信号与主动中微子的混合角度
Bounds on sterile neutrino lifetime and mixing angle with active neutrinos by global 21 cm signal
论文作者
论文摘要
无菌中微子可能是暗物质的候选者。无菌中微子是辐射不稳定的，可以将光子能量注入乳层间培养基（IGM）。将光子能量注射到IgM中可以改变宇宙黎明期间IgM气体的温度和电离历史。基于λCDM框架的理论模型预测宇宙黎明时代的21 cm线的吸收曲线。最近，检测全球电离标志时代（边缘）协作时期的实验证实了这种吸附信号。将能量注入IgM可以改变21 cm信号中的吸收幅度。考虑到宇宙黎明处的21 cm吸收信号，我们限制了无菌中微子的寿命和无菌中微子与活性中微子的混合角。我们还将这些界限与其他天体物理观察界限进行了比较。
Sterile neutrinos can be a possible candidate for dark matter. Sterile neutrinos are radiatively unstable and can inject photon energy into the intergalactic medium (IGM). The injection of photon energy into IGM can modify the temperature and ionization history of IGM gas during cosmic dawn. Theoretical models based on the ΛCDM framework predict an absorption profile in the 21 cm line during the cosmic dawn era. Recently, the Experiment to Detect the Global Epoch of Reionization Signature (EDGES) collaboration confirmed such an adsorption signal. Injection of energy into IGM can modify the absorption amplitude in the 21 cm signal. Considering the 21 cm absorption signal at cosmic dawn, we constrain the lifetime of sterile neutrinos and the mixing angle of sterile neutrinos with active neutrinos. We also compare these bounds with other astrophysical observational bounds.
