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arXiv 2106.06265astro-ph.COgr-qc
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自相互作用暗物质晕模型中的原初黑洞合并率

Primordial Black Hole Merger Rate in Self-Interacting Dark Matter Halo Models

Saeed Fakhry, Mahdi Naseri, Javad T. Firouzjaee, Mehrdad Farhoudi

摘要:

研究了自相互作用暗物质(SIDM)晕模型中原初黑洞(PBH)的合并速率。为了探索SIDM晕模型的密度分布的数值描述,我们使用先前进行的模拟的结果与$σ/m=10~{\rm cm^{2}g^{-1}}$的SIDM晕模型。我们还提出了一个浓度-质量-时间的关系,可以解释晕密度分布的演变与SIDM模型。此外,我们还研究了可能随机分布在暗物质晕介质中的PBH的相遇条件。在这些假设下,我们计算合并率的PBH在每个晕考虑SIDM晕模型和比较的结果与冷暗物质(CDM)晕模型。为了做到这一点,我们采用的定义后的时间晕男性化作为晕质量的函数。我们指出,SIDM晕模型$f_{\rm PBH}>0.32$可以产生足够的PBH合并的方式,这些超过了一个由CDM晕模型。通过考虑球坍缩晕质量函数,我们得到了类似的结果的累积合并率的PBH。此外,我们还计算了PBH总合并率的红移演化。为了确定对PBH丰度的约束,我们研究了PBH的合并率,它们的分数和质量,并将其与高级LIGO(aLIGO)-高级处女座(aVirgo)探测器在第三次观测运行期间估计的黑洞合并率进行比较。结果表明,在SIDM晕模型的背景下,合并率的$10~M_{\odot}-10~M_{\odot}$事件可以潜在地落在aLIGO-aVirgo窗口。我们还估计了PBH的分数和它们的质量之间的关系,这与我们的研究结果是一致的。

英文摘要:

We study the merger rate of primordial black holes (PBHs) in self-interacting dark matter (SIDM) halo models. To explore a numerical description for the density profile of SIDM halo models, we use the result of a previously performed simulation for SIDM halo models with $σ/m=10~{\rm cm^{2}g^{-1}}$. We also propose a concentration-mass-time relation that can explain the evolution of the halo density profile related to SIDM models. Furthermore, we investigate the encounter condition of PBHs that may have been randomly distributed in the medium of dark matter halos. Under these assumptions, we calculate the merger rate of PBHs within each halo considering SIDM halo models and compare the results with that obtained for cold dark matter (CDM) halo models. To do this, we employ the definition of the time after halo virialization as a function of halo mass. We indicate that SIDM halo models for $f_{\rm PBH}>0.32$ can generate sufficient PBH mergers in such a way that those exceed the one resulted from CDM halo models. By considering the spherical-collapse halo mass function, we obtain similar results for the cumulative merger rate of PBHs. Moreover, we calculate the redshift evolution of the PBH total merger rate. To determine a constraint on the PBH abundance, we study the merger rate of PBHs in terms of their fraction and masses and compare those with the black hole merger rate estimated by the Advanced LIGO (aLIGO)-Advanced Virgo (aVirgo) detectors during the third observing run. The results demonstrate that within the context of SIDM halo models, the merger rate of $10~M_{\odot}-10~M_{\odot}$ events can potentially fall within the aLIGO-aVirgo window. We also estimate a relation between the fraction of PBHs and their masses, which is well consistent with our findings.

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