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Rescuing high-scale leptogenesis using primordial black holes

Bernal, Nicolás; Fong, Chee Sheng; Perez-Gonzalez, Yuber F.; Turner, Jessica

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Nicolás Bernal

Chee Sheng Fong


We explore the interplay between light primordial black holes (PBH) and high-scale baryogenesis, with a particular emphasis on leptogenesis. We first review a generic baryogenesis scenario where a heavy particle, X, with mass, MX, produced solely from PBH evaporation decays to generate a baryon asymmetry. We show that the viable parameter space is bounded from above by MX≲1017GeV and increases with decreasing MX. We demonstrate that regions of the leptogenesis parameter space, where the lightest right-handed neutrino (RHN) mass MN1≳1015GeV and neutrino mass scale mν≳0.1eV, excluded in standard cosmology due to ΔL=2 washout processes, become viable with the assistance of light PBHs. This scenario of PBH-assisted leptogenesis occurs because the PBHs radiate RHNs via Hawking evaporation late in the Universe’s evolution when the temperature of the thermal plasma is low relative to the RHN mass. Subsequently, these RHNs can decay and produce a lepton asymmetry while the washout processes are suppressed.


Bernal, N., Fong, C. S., Perez-Gonzalez, Y. F., & Turner, J. (2022). Rescuing high-scale leptogenesis using primordial black holes. Physical Review D, 106(3),

Journal Article Type Article
Acceptance Date Aug 2, 2022
Online Publication Date Aug 18, 2022
Publication Date 2022-08
Deposit Date Sep 28, 2022
Publicly Available Date Sep 29, 2022
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 106
Issue 3


Published Journal Article (Advance online version) (2 Mb)

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Copyright Statement
Advance online version Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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