Cosmic Conundra Explained by Thermal History and Primordial Black Holes
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(2019)cite arxiv:1906.08217Comment: 7 pages, 4 figures.

A universal mechanism may be responsible for several unresolved cosmic conundra. The sudden drop in the pressure of relativistic matter at $W^\pm / Z^0$ decoupling, the quark-hadron transition and $e^+e^-$ annihilation enhances the probability of primordial black hole (PBH) formation in the early Universe. Assuming the amplitude of the primordial curvature fluctuations is approximately scale-invariant, this implies a multi-modal PBH mass spectrum with peaks at $10^-6$, $1$, $30$, and $10^6\,M_ødot$. This suggests a unified PBH scenario which naturally explains the dark matter and recent microlensing observations, the LIGO/Virgo black hole mergers, the correlations in the cosmic infrared and X-ray backgrounds, and the origin of the supermassive black holes in galactic nuclei at high redshift. A distinct prediction of our model is that LIGO/Virgo should soon observe the merging of black holes with masses between $2$ and $5\,M_ødot$ or above $70\,M_ødot$ and with low mass ratios.
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