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Constraints on primordial black holes with CMB spectral distortions
Physical Review D ( IF 5 ) Pub Date : 2022-08-10 , DOI: 10.1103/physrevd.106.043516
Yupeng Yang

In the mixed dark matter scenarios consisting of primordial black holes (PBHs) and weakly interacting massive particles (WIMPs), WIMPs can be accreted onto PBHs to form ultracompact minihalos (UCMHs) with a density spike in the early universe. Compared with the classical dark matter halo, UCMHs are formed earlier and have a higher density of center. Since the annihilation rate is proportional to the squared number density of WIMPs, it is expected that WIMPs annihilation within UCMHs is enhanced and has influences on the early universe. Between the time of recombination and matter-radiation equality, the energy released from WIMPs annihilation within UCMHs is injected into the Universe resulting in cosmic microwave background y-type distortion. We investigate these effects and derive the upper limits on the abundance of PBHs taking advantage of the observational results of a far infrared absolute spectrophotometer (FIRAS). We find that for the WIMPs mass range 1mχ1000GeV, the upper limits on the abundance of PBHs are 5×103ΩPBH5×102.

中文翻译:

对具有 CMB 光谱畸变的原始黑洞的约束

在由原始黑洞 (PBH) 和弱相互作用大质量粒子 (WIMP) 组成的混合暗物质场景中,WIMP 可以吸积到 PBH 上,形成在早期宇宙中密度达到峰值的超致密微晕 (UCMH)。与经典暗物质晕相比,UCMHs 形成较早,中心密度较高。由于湮灭率与WIMPs的平方数密度成正比,因此预计UCMHs内的WIMPs湮灭会增强,并对早期宇宙产生影响。在复合时间和物质-辐射平等之间,UCMHs内WIMPs湮灭释放的能量被注入宇宙,产生宇宙微波背景是的型失真。我们利用远红外绝对分光光度计 (FIRAS) 的观测结果研究这些影响并得出 PBH 丰度的上限。我们发现对于 WIMP 质量范围1χ1000锗钒, PBHs 丰度的上限是5×10-3ΩPBH5×10-2.
更新日期:2022-08-10
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