Self-interacting sterile neutrino dark matter: The heavy-mediator case
Self-interacting sterile neutrino dark matter: The heavy-mediator case
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自相互作用惰性中微子暗物质：重介体案例
DOI：
10.1103/physrevd.100.023533
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发表时间：
2019
影响因子：
5
通讯作者：
Fuller, George M.
中科院分区：
文献类型：
--
作者：
Johns, Lucas;Fuller, George M.
要想解释暗物质的全部遗迹丰度，除了kev尺度的无菌中微子本身，还需要额外的新物理。我们在这里考虑的额外因素是无菌中微子之间存在自我相互作用。我们检查了在这种情况下，活动到无菌的转换是否被放大到足以在子约束混合角的情况下获得观测到的暗物质丰度。事实证明，在我们探索的区域，情况从来都不是这样：要么是自我相互作用的影响太小，无法逃脱质量和混合角的限制，要么是它们的影响太大，导致暗物质过度产生。由于在有效介质混合角满足共振准则，所以发生了从边缘到过度有效的急剧转变。一旦系统发生共振，游戏就差不多结束了，因为玻尔兹曼方程中的非线性导致了稀有中微子的失控产生，开始于几百MeV的等离子体温度，通常结束于几十MeV。因此，这种情况在很大程度上是由其自身的动态决定的。在这项研究中，我们只关注重量超过的调解人；未来的工作将把分析扩展到较轻的调解人，允许与小规模结构问题引发的各种情景进行接触。
For active-sterile mixing to be responsible for the full relic abundance of dark matter additional new physics is needed beyond the keV-scale sterile neutrino itself. The extra ingredient we consider here is the presence of self-interactions among the sterile neutrinos. We examine whether active-to-sterile conversion is amplified enough in this scenario that the observed abundance of dark matter can be obtained with a subconstraint mixing angle. This turns out never to be the case in the region we explore: either self-interactions have too small an impact and cannot escape bounds on the mass and mixing angle, or they have too great an impact and cause dark matter to be overproduced. The sharp transition from marginal to excessive effectiveness occurs because a resonance criterion is met in the effective in-medium mixing angle. Once the system goes resonant the game is as good as over, as nonlinearity in the Boltzmann equation leads to runaway production of sterile neutrinos, beginning at a plasma temperature of a few hundred MeV and typically ending at a few tens of MeV. The scenario is therefore ruled out largely by its own dynamics. In this study, we focus exclusively on mediators heavier than; future work will extend the analysis to lighter mediators, allowing for contact to be made with the kinds of scenarios motivated by issues of small-scale structure.
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