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arXiv 2306.03087astro-ph.CO
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原初黑洞在引力波成团性中的信号

Signatures of primordial black holes in gravitational wave clustering

Sarah Libanore, Michele Liguori, Alvise Raccanelli

AI总结:

本文研究恒星质量原初黑洞双星对未来引力波并合事件成团性测量的影响,通过功率谱、星系互相关及贝叶斯模型选择给出其可探测性与暗物质占比约束。

摘要:

原初黑洞(PBHs)是否可能存在,是现代宇宙学中的一个开放问题。在检验其存在的各种手段中,来自其并合产生的引力波(GW)构成了一种强有力的工具。在本工作中,我们研究恒星质量PBH双星会如何影响未来GW巡天中对并合事件成团性的测量。我们同时考虑了在早期和晚期宇宙中形成的PBH双星,并表明,只要PBH并合至少占全部探测事件数的约60%,它们所引入的功率谱修正就可以在约2σ–3σ水平上被探测到(具体取决于某些假设)。通过加入与星系巡天的互相关,该阈值可降低至约40%。在GW源的红移测定较差的情况下,约束能力会下降约2倍。假定一个关于PBH并合率的理论模型,我们可以将结果转化为对PBH所占暗物质比例f_PBH的约束。最后,我们进行了贝叶斯模型选择预测,并确认我们发展的分析方法应当能够探测约30倍太阳质量的PBHs,前提是它们占f_PBH约10^-4–10^-3(取决于所考虑的模型不确定性),从而可与其他探测手段相竞争。

英文摘要:

The possible existence of primordial black holes (PBHs) is an open question in modern cosmology. Among the probes to test it, gravitational waves (GW) coming from their mergers constitute a powerful tool. In this work, we study how stellar mass PBH binaries could affect measurements of the clustering of merger events in future GW surveys. We account for PBH binaries formed both in the early and late Universe and show that the power spectrum modification they introduce can be detected at $\sim 2σ-3σ$ (depending on some assumptions) whenever PBH mergers make up at least $\sim 60\%$ of the overall number of detected events. By adding cross-correlations with galaxy surveys, this threshold is lowered to $\sim 40\%$. In the case of a poor redshift determination of GW sources, constraints are degraded by about a factor of 2. Assuming a theoretical model for the PBH merger rate, we can convert our results to constraints on the fraction of dark matter in PBHs, $f_{\rm PBH}$. Finally, we perform a Bayesian model selection forecast and confirm that the analysis we develop could be able to detect $\sim30M_\odot$ PBHs if they account for $f_{\rm PBH}\sim 10^{-4}-10^{-3}$, depending on the model uncertainty considered, being thus competitive with other probes.

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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