Lyman-α森林对暗物质的约束：来自暗部门衰变的模型
Lyman-$α$ Forest Constraint on Dark Matter from Dark Sector Decay
AI总结：
通过Lyman-α森林观测研究暗物质从暗部门衰变的约束，结合大爆炸核合成数据，限制亚GeV暗物质质量，排除轻于10^-1 GeV的可能。
摘要：
通过利用Lyman-α森林观测探测的小尺度结构形成，我们研究了暗物质从暗部门衰变模型的约束。我们计算了暗物质的相空间分布和线性物质功率谱。我们将该暗物质模型中的非热暗物质分布映射到近似热的暖暗物质分布，并利用此近似来获得Lyman-α森林观测的约束。我们将最新的Lyman-α森林界限与大爆炸核合成的约束结合起来。由于这两个探测器提供高度互补的约束，我们对亚GeV暗物质施加了严格限制。因此，质量轻于约10^-1 GeV的被排除，从而显著限制了允许的参数空间。更广泛地说，我们的发现展示了小尺度结构观测在检验非热暗物质范式中的效用，为探索更广泛的晚期衰变模型提供了有价值的见解。
英文摘要：
By exploiting small-scale structure formation probed by Lyman-$α$ forest observations, we study constraints on a model of dark matter from dark sector decay. We compute the phase space distribution of the dark matter and the linear matter power spectrum. We map the non-thermal dark matter distribution in this dark matter model to an approximate thermal warm dark matter distribution, and use this approximation to obtain a constraint from the Lyman-$α$ forest observation. We combine the latest Lyman-$α$ forest bounds with the constraint from the Big Bang Nucleosynthesis. As these two probes offer highly complementary constraints, we impose strong limits on sub-GeV dark matter. Consequently, masses lighter than $\sim 10^{-1}$ GeV are excluded, thereby significantly limiting the allowed parameter space. More broadly, our findings demonstrate the utility of small-scale structure observations in testing non-thermal dark matter paradigms, offering valuable insights for exploring a wider class of late-time decay models.
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