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arXiv 1809.01679astro-ph.CO
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轴子宇宙学中的最小成星晕质量

Minimum star-forming halo mass in axion cosmology

James M. Sullivan, Shingo Hirano, Volker Bromm

摘要:

阐明暗物质的粒子物理本质是现代科学的重大挑战之一。目前在实验室中缺乏任何直接的DM探测,这就增加了对天体物理约束的需求,将搜索范围扩展到DM模型,超越了流行的弱相互作用大质量粒子(WIMP)场景。在这里,我们应用经典的Rees-Ostriker-Silk冷却标准的星系形成模型与超轻轴子DM,也被称为模糊暗物质(FDM)。由此产生的约束条件提供了一个启发式的框架,为即将到来的观察,我们的近似分析激励未来的FDM结构形成的自洽模拟的需要。我们使用观测约束DM主机的超暗矮(UFD)星系的本地组,连同红移约束的发生从最近的EDGES 21厘米宇宙学测量的原始恒星形成,来说明这种方法。我们发现,现有的限制是直接调和与标准$Λ$ CDM,但不利于FDM轴子质量低于$\sim 10^{-21}\,{\rm eV}/c^2$。利用DM粒子物理的天体物理探测器的未来潜力是引人注目的。

英文摘要:

Elucidating the particle physics nature of dark matter (DM) is one of the great challenges in modern science. The current lack of any direct DM detections in the laboratory heightens the need for astrophysical constraints, extending the search to DM models beyond the popular weakly interacting massive particle (WIMP) scenario. We here apply the classical Rees-Ostriker-Silk cooling criterion for galaxy formation to models with ultralight axion DM, also known as fuzzy dark matter (FDM). The resulting constraints provide a heuristic framework for upcoming observations, and our approximate analysis motivates the need for future, self-consistent simulations of FDM structure formation. We use observational constraints for the DM hosts of ultra faint dwarf (UFD) galaxies in the Local Group, together with the redshift constraints for the onset of primordial star formation from the recent EDGES 21-cm cosmology measurement, to illustrate this approach. We find that the existing constraints are straightforward to reconcile with standard $Λ$CDM, but disfavour FDM axion masses below $\sim 10^{-21}\,{\rm eV}/c^2$. The future potential for harnessing astrophysical probes of DM particle physics is compelling.

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