论文标题
无菌中微子暗物质与$Δn_ {\ rm eff} $之间的亲密关系
Intimate Relationship Between Sterile Neutrino Dark Matter and $ΔN_{\rm eff}$
论文作者
论文摘要
自我相互作用的中微子假说是解决无菌中微子暗物质与间接检测约束之间的张力的充分动机。它还可以导致从实验室到宇宙的许多可测试信号。我们探索了一个由具有亚M-EV质量的大符号标量介导的中微子自我交互模型，并表明解释了无菌中微子暗物质的遗物密度意味着早期宇宙中额外辐射的量下降，尤其是$Δn_{\ rm eff}> 0.12> 0.12 $在CMB epcoch上。通过在雅典娜天文台进行改进的$ x $射线搜索，将进一步加强这种下限。即将到来的CMB-S4项目将明确测试这种亲密关系。
The self-interacting neutrino hypothesis is well motivated for addressing the tension between the origin of sterile neutrino dark matter and indirect detection constraints. It can also result in a number of testable signals from the laboratories to the cosmos. We explore a model of neutrino self-interaction mediated by a Majoron-like scalar with sub-MeV mass, and show that explaining the relic density of sterile neutrino dark matter implies a lower bound on the amount of extra radiation in early universe, in particular $ΔN_{\rm eff}>0.12$ at the CMB epoch. This lower bound will be further strengthened with an improved $X$-ray search at the Athena observatory. Such an intimate relationship will be unambiguously tested by the upcoming CMB-S4 project.
