Primordial black holes with mass $10^{16}-10^{17}$ g and reionization of the Universe

Abstract

Primordial black holes (PBHs) with mass $10^{16}-10^{17}$ g almost escape constraints from observations so could essentially contribute to dark matter density. Hawking evaporation of such PBHs produces with a steady rate $\gamma$- and $e^{\pm }$-radiations in MeV energy range, which can be absorbed by ordinary matter. Simplified estimates show that a small fraction of evaporated energy had to be absorbed by baryonic matter what can turn out to be enough to heat the matter so it is fully ionized at the redshift $z\sim \mathrm{5...10}$. The result is found to be close to a borderline case where the effect appears, what makes it sensitive to the approximation used. In our approximation, degree of gas ionization reaches 50-100% by $z\sim 5$ for PBH mass $(\mathrm{3...7})\times 10^{16}$ g with their abundance corresponding to the upper limit.

14 pages, 8 figures, v3: a few comments have been added as compared to previous version

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• Examining the end of inflation with primordial black holes mass distribution and gravitational waves
• Primordial black hole constraints with Hawking radiation -- a review
• Close encounters of the primordial kind: a new observable for primordial black holes as dark matter
• Constraints on primordial black holes and curvature perturbations from the global 21cm signal
• Constraining spinning primordial black holes with global 21-cm signal
• Constraints on accreting primordial black holes with the global 21-cm signal
• Influences of accreting primordial black holes on the global 21 cm signal in the dark ages
• Transitions between topologically non-trivial configurations
• Primordial blackhole formation: Exploring chaotic potential with a sharp step via the GLMS perspective
• Gravitational Waves from Gauge Quanta Produced during Inflation