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arXiv 2111.04087hep-phastro-ph.COastro-ph.HEhep-ex
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自相互作用中微子与无源中微子暗物质的宇宙学依赖性

Cosmological Dependence of Sterile Neutrino Dark Matter With Self-Interacting Neutrinos

Carlos Chichiri, Graciela B. Gelmini, Philip Lu, Volodymyr Takhistov

摘要:

未被探索的中微子相互作用可能是理解暗物质(DM)本质的关键。特别是,具有新的自相互作用的活性中微子可以产生keV质量的无菌中微子,通过Dodelson-Widrow机制为大范围的活性无菌混合值占整个DM。这种产生通常发生在宇宙中一个未知时代的大爆炸核合成(BBN)之前。我们评估如何混合范围的千电子伏质量的不育中微子DM是受早期宇宙前BBN宇宙学的不确定性。这是特别相关的确定可行的参数空间的无菌中微子搜索允许所有天体物理学的限制,以及宇宙学,因为检测到一个无菌中微子可能构成第一次观察到一个粒子提供信息的前BBN时代。我们发现,在早期宇宙宇宙学和中微子相互作用的组合不确定性显着扩大了允许的参数空间的不育中微子,可以构成整个DM。

英文摘要:

Unexplored interactions of neutrinos could be the key to understanding the nature of the dark matter (DM). In particular, active neutrinos with new self-interactions can produce keV-mass sterile neutrinos that account for the whole of the DM through the Dodelson-Widrow mechanism for a large range of active-sterile mixing values. This production typically occurs before Big-Bang Nucleosynthesis (BBN) in a yet uncharted era of the Universe. We assess how the mixing range for keV-mass sterile neutrino DM is affected by the uncertainty in the early Universe pre-BBN cosmology. This is particularly relevant for identifying the viable parameter space of sterile neutrino searches allowed by all astrophysical limits, as well as for cosmology, since the detection of a sterile neutrino could constitute the first observation of a particle providing information about the pre-BBN epoch. We find that the combined uncertainties in the early Universe cosmology and neutrino interactions significantly expand the allowed parameter space for sterile neutrinos that can constitute the whole of the DM.

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