论文标题
照亮黑暗时代：从积聚到原始黑洞的宇宙背景
Illuminating the dark ages: Cosmic backgrounds from accretion onto primordial black hole dark matter
论文作者
论文摘要
冷暗物质作为不同质量原始黑洞（PBH）的总和可以解释许多未解决的天体物理谜团。在这里，我假设PBH质量分布可提供大部分暗物质，与所有约束一致，并估算Baryon积聚到PBH上，这有助于宇宙背景辐射，主要是宇宙X射线和宇宙X射线与深层chandra和Spitzer Surpuctery的宇宙iNfrared背景波动之间的相关信号。我假设Bondi捕获和对流以合理的BARYON密度和Baryons和PBH之间的有效相对速度以及适当的积聚和辐射效率的有效相对速度主导，并在PBH质谱和宇宙时间内整合。 X射线贡献确实与残留的X射线背景信号和X射线/红外波动一致。 Z〜17-30处的通量峰，与需要信号来自高红移的约束一致。 PBH对红外背景波动的贡献仅为1％。 磁场是Bondi捕获过程中的重要成分，PBH可以在放大早期种子场并维持它们中发挥作用，直到设定的银河发电机过程为止。假定的PBH种群对宇宙的重新离子历史的贡献与Planck Ionionizatization限制不冲突。来自PBH的X射线加热可以为星系组提供熵的贡献。诱人的边缘红移21厘米吸收线特征可以连接到无线电对宇宙背景辐射的贡献。最后，银河中心中的中间质量黑洞的数量和弥漫性X射线发射与假定的PBH暗物质一致。在银河山脊最深的观测中，一些离散的来源确实可以吸收PBH。
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.
