21厘米信号的快速出现暗示了暗物质粒子的优选质量范围
Rapid onset of the 21-cm signal suggests a preferred mass range for dark matter particle
摘要：
我们正在接近一个新的时代，探测来自宇宙黎明时期的21厘米中性氢信号。这个信号提供了一个独特的窗口，处女宇宙，例如，来研究具有不同小尺度行为的暗物质模型。EDGES合作最近公布了全球21厘米光谱的第一个结果。我们证明，这样的信号可以用来设置，不像大多数关于暗物质的观测，暗物质粒子的质量的下限和上限。我们研究了21厘米的信号产生一个简单的温暖的暗物质模型与尖锐的$k$窗口函数校准高红移。我们将PopIII恒星的形成与莱曼α和无线电背景产生联系起来。利用MCMC对参数空间进行采样，我们发现要匹配EDGES信号，一个温暖的暗物质粒子必须具有$7.3^{+1.6}_{-3.3}$ keV的质量，置信区间为68%.这转化为模糊暗物质的$2.2^{+1.4}_{-1.7} \times 10^{-20}$ eV和Dodelson-Widrow无菌中微子的$63^{+19}_{-35}$ keV。冷的暗物质由于其缓慢的结构生长而无法再现信号。
英文摘要：
We are approaching a new era to probe the 21-cm neutral hydrogen signal from the period of cosmic dawn. This signal offers a unique window to the virgin Universe, e.g., to study dark matter models with different small-scale behaviours. The EDGES collaboration has recently published the first results of the global 21-cm spectrum. We demonstrate that such a signal can be used to set, unlike most observations concerning dark matter, both lower and upper limits for the mass of dark matter particles. We study the 21-cm signal resulting from a simple warm dark matter model with a sharp-$k$ window function calibrated for high redshifts. We tie the PopIII star formation to Lyman-alpha and radio background production. Using MCMC to sample the parameter space we find that to match the EDGES signal, a warm dark matter particle must have a mass of $7.3^{+1.6}_{-3.3}$ keV at 68\% confidence interval. This translates to $2.2^{+1.4}_{-1.7} \times 10^{-20}$ eV for fuzzy dark matter and $63^{+19}_{-35}$ keV for Dodelson-Widrow sterile neutrinos. Cold dark matter is unable to reproduce the signal due to its slow structure growth.
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