Mainly motivated by the recent GW190521 mass gap event which we take as a benchmark point, we critically assess if binaries made of a primordial black hole and a black hole of astrophysical origin may form, merge in stellar clusters and reproduce the LIGO/Virgo detection rate. While two previously studied mechanisms — the direct capture and the three body induced — seem to be inefficient, we propose a new “catalysis” channel based on the idea that a subsequent chain of single-binary and binary-binary exchanges may lead to the formation of a high mass binary pairs and show that it may explain the recent GW190521 event if the local overdensity of primordial black holes in the globular cluster is larger than a few.

主要受我们以最近的 GW190521 质量间隙事件为基准点的推动，我们批判性地评估了由原始黑洞和天体物理起源的黑洞组成的双星是否可能形成、合并成星团并重现 LIGO/Virgo 探测率. 虽然先前研究的两种机制——直接捕获和三体诱导——似乎效率低下，但我们提出了一种新的“催化”通道，其基础是后续的单二元和二元-二元交换链可能导致形成并表明如果球状星团中原始黑洞的局部超密度大于几个，它可以解释最近的 GW190521 事件。