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arXiv 1706.02707hep-phastro-ph.CO
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热化无菌中微子暗物质

Thermalizing sterile neutrino dark matter

Rasmus S. L. Hansen, Stefan Vogl

摘要:

通过振荡产生的惰性中微子是一个很好的暗物质候选者,但最近的观测限制已经排除了大部分的参数空间。我们分析了新的相互作用对早期宇宙中keV无菌中微子暗物质演化的影响。基于一般的考虑,我们发现了一个机制,热化后的初始生产振荡的不育中微子。不育中微子的热化伴随着暗熵的产生,这增加了暗物质的产额,并导致较低的特征动量。这解决了结构形成和X射线观测之间日益增长的紧张关系,甚至恢复了简单的非共振产生作为产生无菌中微子暗物质的可行方法。我们调查的代表性模型中的热化机制的实现所需的参数,并发现一个简单的估计的基础上的能量和熵守恒描述的机制。

英文摘要:

Sterile neutrinos produced through oscillations are a well motivated dark matter candidate, but recent constraints from observations have ruled out most of the parameter space. We analyze the impact of new interactions on the evolution of keV sterile neutrino dark matter in the early Universe. Based on general considerations we find a mechanism which thermalizes the sterile neutrinos after an initial production by oscillations. The thermalization of sterile neutrinos is accompanied by dark entropy production which increases the yield of dark matter and leads to a lower characteristic momentum. This resolves the growing tensions with structure formation and X-ray observations and even revives simple non-resonant production as a viable way to produce sterile neutrino dark matter. We investigate the parameters required for the realization of the thermalization mechanism in a representative model and find that a simple estimate based on energy- and entropy conservation describes the mechanism well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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