论文标题
Lux Ex Tenebris：在宇宙黎明期间歼灭暗物质的烙印
Lux ex tenebris: The imprint of annihilating dark matter on the intergalactic medium during Cosmic Dawn
论文作者
论文摘要
即将进行的高度红移21厘米线的测量值以及下一代射电望远镜（例如HERA和SKA）将为探测暗物质（DM）物理学的有趣机会（EOR），宇宙黎明（EOR），宇宙黎明和黑暗年龄。由于HERA已经在建设中，因此需要彻底了解这些时期期间DM物理学对播层间培养基（IGM）的影响。我们介绍了$ 2 \ times 512^3 $颗粒的流体动力仿真套件的第一个结果（100 \ h^{ - 1} \ \ text {mpc}）^3 $ box，带有DM nihihitation和Baryonic冷却物理学。我们关注的是红移$ z \ sim 11 $，就在我们的模拟开始之前，就会在IGM和结构形成上讨论DM歼灭的烙印。我们发现，尽管结构的形成不受热wimp的影响，而热wimps的重量大于$m_χ×gtrsim 100 \ \ \ \ text {mev} $，但会从$ \ mathcal {o} $（gev）dm颗粒中加热，可能会在iGM上留下重大的压缩，以使IGM有重大的压印，从而改变了21cm信号。低密度区域的冷气特别容易受到DM加热的影响。但是，我们注意到，目前在我们的模拟中尚未考虑延迟能量沉积。
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.
