Constraints on dark matter annihilation or decay offer unique insights into the nature of dark matter. We illustrate how surveys dedicated to detect the highly redshifted 21 cm signal from the dark ages will offer a new window into properties of particle dark matter. The 21 cm intensity mapping signal and its fluctuations are sensitive to energy injection from annihilation or decay of long-lived particles in a way that is complementary to other probes. We present forecasted constraints from forthcoming and next-generation radio surveys. We show that, while SKA might be capable of a detection for some cases, the most promising opportunity to detect dark matter in the 21 cm intensity mapping signal is with a futuristic radio array on the lunar far-side, with the potential to detect a signal many orders of magnitude weaker than current or maximal constraints from other probes.

中文翻译：

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用暗物质照亮黑暗时代

对暗物质湮灭或衰变的约束提供了对暗物质性质的独特见解。我们说明了致力于检测来自黑暗时代的高度红移 21 厘米信号的调查将如何为了解粒子暗物质的特性提供一个新窗口。21 cm 强度映射信号及其波动对来自长寿命粒子湮灭或衰变的能量注入敏感，其方式与其他探针互补。我们提出了即将到来的和下一代无线电调查的预测限制。我们表明，虽然 SKA 在某些情况下可能能够探测到，但在 21 厘米强度映射信号中探测暗物质的最有希望的机会是在月球远端使用未来派的无线电阵列，