arXiv 1702.084642017-02hep-phastro-ph.COastro-ph.SRhep-ex

太阳中微子作为暗物质-中微子相互作用的探测器

Solar Neutrinos as a Probe of Dark Matter-Neutrino Interactions

Francesco Capozzi, Ian M. Shoemaker, Luca Vecchi

备注：: 19 pages, 7 figures
DOI：: 10.1088/1475-7516/2017/07/021

摘要：

eV尺度的惰性中微子长期以来一直在短基线中微子实验的异常背景下进行研究。只要无菌中微子区具有奇异相互作用的非平凡动力学，它们的宇宙学就可以与我们对早期宇宙的理解相兼容，这可能为暗物质（DM）之谜提供了一个联系。DM和中微子之间的相互作用也被提出来解决大尺度结构形成领域中长期存在的“丢失卫星”问题。出于这些考虑，在本文中，我们讨论了现实的情况下，光灭菌耦合DM。我们指出，在这个框架内，主动中微子获得有效的耦合DM表现为一个新的物质潜力的传播介质内的不对称DM。假设至少有一小部分的非对称DM已被太阳捕获，我们表明，这些方案的参数空间的一个相当大的区域可以探测太阳中微子实验，特别是在小耦合和光介质的制度，所有其他探头变得低效。在后一种情况下，这些方案在所有通道中的行为与熟悉的$3+1$模型相同，但太阳数据除外，其中发生了太阳暗MSW效应。太阳暗MSW的特点是最具活力的$^8$ B和CNO中微子的修改，而其他通量基本上不受影响。

英文摘要：

Sterile neutrinos at the eV scale have long been studied in the context of anomalies in short baseline neutrino experiments. Their cosmology can be made compatible with our understanding of the early Universe provided the sterile neutrino sector enjoys a nontrivial dynamics with exotic interactions, possibly providing a link to the Dark Matter (DM) puzzle. Interactions between DM and neutrinos have also been proposed to address the long-standing "missing satellites" problem in the field of large scale structure formation. Motivated by these considerations, in this paper we discuss realistic scenarios with light steriles coupled to DM. We point out that within this framework active neutrinos acquire an effective coupling to DM that manifests itself as a new matter potential in the propagation within a medium of asymmetric DM. Assuming that at least a small fraction of asymmetric DM has been captured by the Sun, we show that a sizable region of the parameter space of these scenarios can be probed by solar neutrino experiments, especially in the regime of small couplings and light mediators where all other probes become inefficient. In the latter regime these scenarios behave as familiar $3+1$ models in all channels except for solar data, where a Solar Dark MSW effect takes place. Solar Dark MSW is characterized by modifications of the most energetic $^8$B and CNO neutrinos, whereas the other fluxes remain largely unaffected.

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