21厘米信号对S波暗物质湮灭的约束：考虑子晕增强效应
21-cm Constraints on S-wave Dark Matter Annihilation with Subhalo-enhanced Effects
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中文总结 AI 辅助
本文利用扩展的DM21cm数值方法结合SASHIMI-C半解析处理，研究子晕增强的S波暗物质湮灭对21厘米信号的影响，发现预期HERA极限在特定质量范围内强于现有约束。
中文摘要 AI 辅助
对21厘米信号的观测可以探测宇宙黎明和再电离时期暗物质湮灭向星系际介质注入的能量。对于S波湮灭，湮灭率取决于暗物质密度的平方，这使得21厘米信号对暗物质晕的次结构敏感。在本工作中，我们扩展了DM21cm的数值方法，以处理包括子晕效应在内的空间非均匀S波湮灭，采用SASHIMI-C的半解析处理。我们的数值结果表明，在暗物质质量范围$m_{\chi}\leq 3\\,{\rm keV}$内，$\u03b3\u03b3$湮灭通道的预期HERA极限强于Leo~T界限，而对于$e^+e^-$湮灭通道，在$m_\chi\sim 0.1$--$1\\,{\rm GeV}$范围内，预期HERA极限是现有界限中最强的。
英文摘要
Observations of the 21-cm signal can probe energy injection into the intergalactic medium arising from dark matter annihilation during cosmic dawn and reionization. For s-wave annihilation, the annihilation rate depends on the squared dark matter density, making the 21-cm signal sensitive to dark matter halo substructure. In this work, we extend the numerical method of DM21cm to address spatially inhomogeneous s-wave annihilation including subhalo effects, using semi-analytical treatment of SASHIMI-C. Our numerical results show that the projected HERA limit for the $γγ$ annihilation channel is stronger than the Leo~T bound within the dark matter mass range of $m_χ\leq 3\,{\rm keV}$, whereas the projected HERA limit for the $e^+e^-$ annihilation channel is the strongest among the existing bounds for $m_χ\sim 0.1$--$1\,{\rm GeV}$.
发表机构
- Luoyang Institute of Science and Technology（洛阳理工学院）
- Chongqing University（重庆大学）
机构由 AI 辅助整理，请以论文原文为准。
