微透镜事件与轴子类曲率子模型中的原初黑洞
Microlensing events and primordial black holes in the axionlike curvaton model
AI总结：
本文研究了轴子类曲率子模型中原初黑洞与微透镜事件的关系，并探讨了其对引力波等宇宙学现象的影响。
摘要：
最近，Subaru超广角摄谱仪（HSC）观测发现了12个微透镜事件候选者。这些事件可以用质量为10^-7-10^-6 M_太阳的原初黑洞（PBH）和暗物质中PBH的分数f_PBH=数量级10^-1来解释。在本文中，我们考虑了两种类型的轴子类曲率子模型中PBH的产生，这两种模型预测了小尺度上的曲率扰动增强。我们展示了微透镜事件可以在轴子类曲率子模型中得到解释，并讨论了引力波等宇宙学意义。
英文摘要：
Recently, Subaru Hyper Suprime-Cam (HSC) observations found 12 candidates for microlensing events. These events can be explained by primordial black holes (PBHs) with masses of $10^{-7}$-$10^{-6} M_\odot$ and a fraction of all dark matter of $f_\mathrm{PBH} = \mathcal{O}(10^{-1})$. In this paper, we consider the PBH production in two types of the axionlike curvaton models, which predict an enhancement of the curvature perturbations on small scales. We show that the microlensing events can be explained in the axionlike curvaton model and discuss the cosmological implications such as gravitational waves.
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