Primordial black holes and lepton flavor violation with scotogenic dark matter

Teruyuki Kitabayashi (Department of Physics, Tokai University, , , 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, , , Japan)

Abstract We show that if the lepton flavor-violating μ → eγ process is observed in the MEG II experiment, the initial density of primordial black holes (PBHs) can be constrained with scotogenic dark matter. As a benchmark case, if PBH evaporation occurs in the radiation-dominated era, the initial density may be 2 × 10$^{−17}$ ≲ β ≲ 3 × 10$^{−16}$ for the (TeV)-scale dark sector in the scotogenic model, where β is the ratio of the PBH density ρ$_{PBH}$ to the radiation density ρ$_{rad}$ at the time of PBH formation. As another benchmark case, if PBHs evaporate in the PBH-dominated era, the initial density may be 1 × 10$^{−8}$ ≲ β ≲ 3 × 10$^{−7}$ for (GeV)-scale dark matter, with other (TeV)-scale particles in the scotogenic model.

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      "source": "OUP", 
      "value": "Abstract We show that if the lepton flavor-violating \u03bc \u2192 e\u03b3 process is observed in the MEG II experiment, the initial density of primordial black holes (PBHs) can be constrained with scotogenic dark matter. As a benchmark case, if PBH evaporation occurs in the radiation-dominated era, the initial density may be 2 \u00d7 10$^{\u221217}$ \u2272 \u03b2 \u2272 3 \u00d7 10$^{\u221216}$ for the (TeV)-scale dark sector in the scotogenic model, where \u03b2 is the ratio of the PBH density \u03c1$_{PBH}$ to the radiation density \u03c1$_{rad}$ at the time of PBH formation. As another benchmark case, if PBHs evaporate in the PBH-dominated era, the initial density may be 1 \u00d7 10$^{\u22128}$ \u2272 \u03b2 \u2272 3 \u00d7 10$^{\u22127}$ for (GeV)-scale dark matter, with other (TeV)-scale particles in the scotogenic model."
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Published on:
04 February 2022
Publisher:
OUP
Published in:
Progress of Theoretical and Experimental Physics , Volume 2022 (2022)
Issue 3
Article ID: 033B02
DOI:
https://doi.org/10.1093/ptep/ptac025
arXiv:
2107.11692
Copyrights:
© The Author(s) 2022. Published by Oxford University Press on behalf of the Physical Society of Japan.
Licence:
CC-BY-4.0

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