Cold dark matter as the sum of different mass Primordial Black Holes (PBH) can explain a number of unsolved astrophysical mysteries. Here I assume a broad PBH mass distribution providing the bulk of the dark matter, consistent with all constraints and estimate the baryon accretion onto PBH contributing to cosmic background radiations, mainly the correlation signal between the Cosmic X-ray and the Cosmic infrared background fluctuations in deep Chandra and Spitzer surveys. I assume Bondi capture and advection dominated disk accretion with reasonable baryon densities and effective relative velocities between baryons and PBH, as well as appropriate accretion and radiation efficiencies, and integrate over the PBH mass spectrum and cosmic time. The X-ray contribution is indeed consistent with the residual X-ray background signal and the X-ray/infrared fluctuations. The flux peaks at z~17-30, consistent with constraints requiring the signal to come from high redshifts. The PBH contribution to the infrared background fluctuations is only about 1%. Magnetic fields are an essential ingredient in the Bondi capture process, and PBH can play a role in amplifying early seed fields and maintaining them until the galactic dynamo processes set in. The contribution of the assumed PBH population to the re-ionization history of the universe does not conflict with the Planck ionization limits. X-ray heating from PBH can provide a contribution to the entropy floor in groups of galaxies. The tantalizing EDGES redshifted 21-cm absorption line feature can be connected to the radio contribution to the cosmic background radiation. Finally, the number of intermediate-mass black holes and the diffuse X-ray emission in the Galactic Center are consistent with the assumed PBH dark matter. Some of the discrete sources in the deepest Chandra observations of the Galactic Ridge could indeed be accreting PBH.

中文翻译：

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照亮黑暗时代：从吸积到原始黑洞暗物质的宇宙背景

冷暗物质作为不同质量的原始黑洞 (PBH) 的总和可以解释许多未解决的天体物理学谜团。在这里，我假设一个广泛的 PBH 质量分布提供了大部分暗物质，与所有约束一致，并估计了 PBH 上的重子吸积对宇宙背景辐射有贡献，主要是宇宙 X 射线和宇宙红外背景波动之间的相关信号深入的钱德拉和斯皮策调查。我假设邦迪俘获和平流主导的盘吸积具有合理的重子密度和重子和 PBH 之间的有效相对速度，以及适当的吸积和辐射效率，并在 PBH 质谱和宇宙时间上进行积分。X 射线贡献确实与残余 X 射线背景信号和 X 射线/红外波动一致。通量在 z~17-30 处达到峰值，符合要求信号来自高红移的限制条件。PBH 对红外背景波动的贡献仅为 1% 左右。磁场是邦迪捕获过程中的重要组成部分，PBH 可以在放大早期种子场并维持它们直到银河发电机过程开始时发挥作用。 假设的 PBH 种群对宇宙重新电离历史的贡献不与普朗克电离极限相冲突。来自 PBH 的 X 射线加热可以对星系群的熵底做出贡献。诱人的 EDGES 红移 21 厘米吸收线特征可以与无线电对宇宙背景辐射的贡献有关。最后，银河系中心的中等质量黑洞的数量和漫射 X 射线发射与假设的 PBH 暗物质一致。银河脊最深的钱德拉观测中的一些离散来源确实可能正在吸积 PBH。