论文标题
从矮星系中观察到恒星的原始黑洞的限制
Constraints on primordial black holes from observation of stars in dwarf galaxies
论文作者
论文摘要
我们提出了一种方法，以限制原始黑洞（PBH）的丰度在PBH群众$ m $ $ 10^{20} $ g的范围内，其基于它们在矮星系中被阳光恒星的捕获，随后发生了恒星破坏。我们以数值计算恒星在典型的矮星系中形成时恒星捕获的概率。要求不超过矮人星系中的恒星的分数$ξ$被PBHS摧毁，这转化为PBH丰度的上限。对于三角形II和$ξ= 0.5 $的参数，我们发现不超过$ \ sim 35 \％的暗物质$可以由质量范围$ 10^{18}的PBH组成，$ 10^{18} - \ text {（少数）} \ times times times times times times 10^{21}} $ g。约束在很大程度上取决于参数$ξ$，如果从观察值中确定$ξ$的较小值，则可能会显着改善。因此，从矮星银河建模中准确确定$ξ$至关重要。
We propose a way to constrain the primordial black hole (PBH) abundance in the range of PBH masses $m$ around $10^{20}$g based on their capture by Sun-like stars in dwarf galaxies, with subsequent star destruction. We calculate numerically the probability of a PBH capture by a star at the time of its formation in an environment typical of dwarf galaxies. Requiring that no more than a fraction $ξ$ of stars in a dwarf galaxy is destroyed by PBHs translates into an upper limit on the PBH abundance. For the parameters of Triangulum II and $ξ=0.5$, we find that no more than $\sim 35\%$ of dark matter can consist of PBHs in the mass range $10^{18} - \text{(a few)}\times 10^{21}$g. The constraints depend strongly on the parameter $ξ$ and may significantly improve if smaller values of $ξ$ are established from observations. An accurate determination of $ξ$ from dwarf galaxy modeling is thus of major importance.
