普适耦合超轻标量暗物质的BBN约束
BBN constraints on universally-coupled ultralight scalar dark matter
摘要：
超轻标量暗物质可以通过一种普适耦合与所有大质量标准模型粒子相互作用。这种耦合改变了标准模型的粒子质量，并影响了大爆炸核合成的动力学。我们建立了暗物质的宇宙学演化模型，考虑到环境对标量质量的修改以及大爆炸核合成的完整动力学。我们发现，精确测量的氦-4丰度设置严格的限制，可用的参数空间，这些限制强烈影响的暗物质的环境质量和中子冻结的动力学。此外，我们在爱因斯坦和约旦框架中进行分析，后者允许我们将模型实现为数值大爆炸核合成代码并分析额外的光元素。数值分析表明，来自氦-4的约束优于氘，并且对锂的影响不足以解决锂问题。与其他几个探测器相比，我们发现大爆炸核合成对大多数参数空间设置了最强的约束。
英文摘要：
Ultralight scalar dark matter can interact with all massive Standard Model particles through a universal coupling. Such a coupling modifies the Standard Model particle masses and affects the dynamics of Big Bang Nucleosynthesis. We model the cosmological evolution of the dark matter, taking into account the modifications of the scalar mass by the environment as well as the full dynamics of Big Bang Nucleosynthesis. We find that precision measurements of the helium-4 abundance set stringent constraints on the available parameter space, and that these constraints are strongly affected by both the dark matter environmental mass and the dynamics of the neutron freeze-out. Furthermore, we perform the analysis in both the Einstein and Jordan frames, the latter of which allows us to implement the model into numerical Big Bang Nucleosynthesis codes and analyze additional light elements. The numerical analysis shows that the constraint from helium-4 dominates over deuterium, and that the effect on lithium is insufficient to solve the lithium problem. Comparing to several other probes, we find that Big Bang Nucleosynthesis sets the strongest constraints for the majority of the parameter space.
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