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arXiv 2301.08299astro-ph.COhep-ph
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中微子自相互作用能否拯救惰性中微子暗物质?

Can Neutrino Self-interactions Save Sterile Neutrino Dark Matter?

Rui An, Vera Gluscevic, Ethan O. Nadler, Yue Zhang

AI总结:

本文检验活性中微子自相互作用产生的惰性中微子暗物质与小尺度结构的一致性,给出质量下限37 keV,并排除重介体强耦合产生全部暗物质,但允许轻介体方案。

摘要:

惰性中微子仅通过中微子扇区与标准模型相互作用,因此代表了一个简单的暗物质(DM)候选者,具有许多潜在的天体物理和宇宙学特征。最近,通过活性中微子自相互作用产生的惰性中微子作为粒子候选者受到关注,它可以在不违反X射线观测最严格约束的情况下产生整个观测到的暗物质遗迹丰度。我们检验了这种产生机制与宇宙中小尺度结构丰度的一致性,该丰度由绕银河系运行的超微弱矮星系群所体现,并推导出惰性中微子粒子质量的下限为37 keV。将这些结果与先前来自粒子物理和天体物理的限制相结合,排除了由强中微子自耦合(通过重(≥1 GeV)标量粒子介导)产生的100%惰性中微子暗物质;然而,数据允许通过轻介体产生惰性中微子暗物质。

英文摘要:

Sterile neutrinos only interact with the Standard Model through the neutrino sector, and thus represent a simple dark matter (DM) candidate with many potential astrophysical and cosmological signatures. Recently, sterile neutrinos produced through self-interactions of active neutrinos have received attention as a particle candidate that can yield the entire observed DM relic abundance without violating the most stringent constraints from X-ray observations. We examine consistency of this production mechanism with the abundance of small-scale structure in the universe, as captured by the population of ultra-faint dwarf galaxies orbiting the Milky Way, and derive a lower bound on the sterile-neutrino particle mass of $37$ keV. Combining these results with previous limits from particle physics and astrophysics excludes $100\%$ sterile neutrino DM produced by strong neutrino self-coupling, mediated by a heavy ($\gtrsim 1~\mathrm{GeV}$) scalar particle; however, data permits sterile-neutrino DM production via a light mediator.

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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