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arXiv 2007.14559astro-ph.HEastro-ph.CO
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LIGO探测到原始黑洞暗物质了吗?--双星黑洞形成中的潮汐扰动

Has LIGO Detected Primordial Black Hole Dark Matter? -- Tidal Disruption in Binary Black Hole Formation

Yuan Gao, Xiaojia Zhang, Meng Su

摘要:

激光干涉引力波天文台(LIGO)频繁探测到$\sim 30 M_{\odot}$黑洞(BH)的二元合并,重新点燃了研究人员对原始黑洞(PBH)是暗物质(DM)的兴趣。在这项工作中,我们着眼于PBH分布DM与单色质量的$30 M_{\odot}$,并研究了捕获的情况下,二进制的形成,其中致密的中心区域DM晕占主导地位。因此,我们特别关注了超大质量黑洞(SMBH)的潮汐效应。在这样做的过程中,我们发现了一个必要的工具,称为损失区,补充了损失锥的使用。我们发现潮汐效应在影响二元形成方面并不突出,这也不足以解释LIGO事件率估计的总体情况,特别是由于微透镜事件限制了PBH中DM分数的质量从接近统一到更小的顺序。与此同时,早期宇宙双星形成的情景被证明是如此普遍,以至于LIGO信号反过来将PBH分数限制在1%以下。因此,人们应该更加相信替代PBH窗口和其他DM候选人。

英文摘要:

The frequent detection of binary mergers of $\sim 30 M_{\odot}$ black holes (BHs) by the Laser Interferometer Gravitational-Wave Observatory (LIGO) rekindled researchers' interest in primordial BHs (PBHs) being dark matter (DM). In this work, we looked at PBHs distributed as DM with a monochromatic mass of $30 M_{\odot}$ and examined the encounter-capture scenario of binary formation, where the densest central region of DM halo dominates. Thus, we paid special attention to the tidal effect by the supermassive black hole (SMBH) present. In doing so, we discovered a necessary tool called loss zone that complements the usage of loss cone. We found that the tidal effect is not prominent in affecting binary formation, which also turned out insufficient in explaining the totality of LIGO's event rate estimation, especially due to a microlensing event constraining the DM fraction in PBH at the mass of interest from near unity to an order smaller. Meanwhile, early-universe binary formation scenario proves so prevailing that the LIGO signal in turn constrains the PBH fraction below one percent. Thus, people should put more faith in alternative PBH windows and other DM candidates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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