Lux ex tenebris：宇宙黎明期间星系际介质上湮灭暗物质的印记
Lux ex tenebris: The imprint of annihilating dark matter on the intergalactic medium during Cosmic Dawn
摘要：
即将使用下一代射电望远镜（如HERA和SKA）对高度红移的21厘米线进行的测量将为探测再电离时代（EoR）、宇宙黎明和黑暗时代期间的暗物质（DM）物理提供有趣的机会。HERA已经在建设中，迫切需要彻底了解DM物理学在这些时代对星系际介质（IGM）的影响。我们提出的第一个结果的流体动力学模拟套件与$2 \times 512^3$粒子在一个$(100 \ h^{-1} \ \text{Mpc})^3$盒DM湮灭和重子冷却物理。我们专注于红移$z \sim 11$，就在我们的模拟再电离开始之前，并讨论了DM湮灭的IGM和结构形成的印记。我们发现，而结构的形成是不受热WIMP比$m_χ\gtrsim 100 \ \text{MeV}$重，加热从$\mathcal{O}$（GeV）DM粒子可能会留下一个显着的印记IGM改变21厘米的信号。低密度区域中的冷气体特别容易受到DM加热的影响。然而，我们注意到，延迟的能量沉积目前没有在我们的模拟中考虑。
英文摘要：
Upcoming measurements of the highly redshifted 21cm line with next-generation radio telescopes such as HERA and SKA will provide the intriguing opportunity to probe dark matter (DM) physics during the Epoch of Reionization (EoR), Cosmic Dawn, and the Dark Ages. With HERA already under construction, there is a pressing need to thoroughly understand the impact of DM physics on the intergalactic medium (IGM) during these epochs. We present first results of a hydrodynamic simulation suite with $2 \times 512^3$ particles in a $(100 \ h^{-1} \ \text{Mpc})^3$ box with DM annihilation and baryonic cooling physics. We focus on redshift $z \sim 11$, just before reionization starts in our simulations, and discuss the imprint of DM annihilation on the IGM and on structure formation. We find that whereas structure formation is not affected by thermal WIMPs heavier than $m_χ\gtrsim 100 \ \text{MeV}$, heating from $\mathcal{O}$(GeV) DM particles may leave a significant imprint on the IGM that alters the 21cm signal. Cold gas in low density regions is particularly susceptible to the effects of DM heating. We note, however, that delayed energy deposition is not currently accounted for in our simulations.
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