论文标题
放松CMB在原始黑洞上的边界：电离方面的作用
Relaxing CMB bounds on Primordial Black Holes: the role of ionization fronts
论文作者
论文摘要
在黑暗时代和介质中随后的能量注入的原始黑洞（PBH）上的物质积聚应在宇宙微波背景（CMB）各向异性上留下烙印。最近的作品声称对PBH丰度的CMB限制很严格，几乎与PBH对二进制BH合并的重力波观测的解释不兼容。通过使用基于流体动力学模拟和对排放效率的保守假设的更现实的积聚模型，我们表明，PBH丰度上的CMB限制的限制比以前估计的$ 10 $和$ 10^4 $ M $ M $ _ $ _ \ odot $更严格的数量级。这重新启动了PBHS可以同时解释暗物质，某些Ligo-Virgo-Kagra二进制BH合并以及超级质量BHS的可能性。更普遍地，我们强调的是，PBH积聚可能是一个相当复杂的物理过程，其速度依赖性很难评估，这在基于积分的PBH丰度限制中引入了大型不确定性。
The accretion of matter onto primordial black holes (PBHs) during the dark ages and the subsequent energy injection in the medium should have left imprints on the cosmic microwave background (CMB) anisotropies. Recent works have claimed stringent CMB limits on the PBH abundance, hardly compatible with a PBH interpretation of the gravitational-wave observations of binary BH mergers. By using a more realistic accretion model based on hydrodynamical simulations and conservative assumptions for the emission efficiency, we show that CMB limits on the PBH abundance are up to two orders of magnitude less stringent than previously estimated between $10$ and $10^4$ M$_\odot$. This reopens the possibility that PBHs might explain at the same time (at least a fraction of) the dark matter, some of the LIGO-Virgo-KAGRA binary BH mergers and the existence of super-massive BHs. More generally, we emphasize that PBH accretion can be a rather complex physical process with velocity dependences that are hard to assess, which introduces large uncertainties in accretion-based limits on the PBH abundance.
