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arXiv 1601.07553astro-ph.COhep-ph
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共振产生的无菌中微子暗物质的天体物理约束

Astrophysical constraints on resonantly produced sterile neutrino dark matter

Aurel Schneider

摘要:

共振产生的无菌中微子被认为是一种有吸引力的暗物质候选者,只需要对粒子物理学的标准模型进行最小的、有充分动机的扩展。由于粒子质量限制在keV范围内,无菌中微子是暖DM的主要候选者,其特征是在最小的可观测尺度上抑制物质扰动。在本文中,我们采取的有效性的共振的情况下,从结构形成的约束的关键看。我们比较预测和观察到的牛奶路卫星的数量,我们引入了一种新的方法来概括现有的莱曼- $α$限制的基础上热遗迹温暖DM的情况下,共振无菌中微子DM。最严格的限值来自Lyman- $α$分析,不包括X射线观察仍然允许的整个参数空间(2- $σ$置信水平)。来自Milky-Way卫星计数的限制不那么严格,为共振无菌中微子DM留下了空间,最明显的是在7.1 keV的建议线信号周围。

英文摘要:

Resonantly produced sterile neutrinos are considered an attractive dark matter (DM) candidate only requiring a minimal, well motivated extension to the standard model of particle physics. With a particle mass restricted to the keV range, sterile neutrinos are furthermore a prime candidate for warm DM, characterised by suppressed matter perturbations at the smallest observable scales. In this paper we take a critical look at the validity of the resonant scenario in the context of constraints from structure formation. We compare predicted and observed number of Milky-Way satellites and we introduce a new method to generalise existing Lyman-$α$ limits based on thermal relic warm DM to the case of resonant sterile neutrino DM. The tightest limits come from the Lyman-$α$ analysis, excluding the entire parameter space (at 2-$σ$ confidence level) still allowed by X-ray observations. Constraints from Milky-Way satellite counts are less stringent, leaving room for resonant sterile neutrino DM most notably around the suggested line signal at 7.1 keV.

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