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Assessing the tension between a black hole dominated early universe and leptogenesis

Perez-Gonzalez, Yuber F. and Turner, Jessica (2021) 'Assessing the tension between a black hole dominated early universe and leptogenesis.', Physical Review D, 104 (10).


We perform the first numerical calculation of the interplay between thermal and black hole induced leptogenesis, demonstrating that the right-handed neutrino surplus produced during the evaporation only partially mitigates the entropy dilution suffered by the thermal component. As such, the intermediate-mass regime of the right-handed neutrinos, 106 GeV ≲ MN ≲ 109 GeV, could not explain the observed baryon asymmetry even for fine-tuned scenarios if there existed a primordial black hole dominated era, consistent with initial black hole masses of Mi ≳ Oð1Þ kg and initial energy density fractions larger than β0 ≳ 10−6. A possible detection of the gravitational waves emitted from the same primordial black holes would place intermediate-scale thermal leptogenesis under tension

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Publisher statement: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.
Date accepted:21 October 2021
Date deposited:01 February 2022
Date of first online publication:16 November 2021
Date first made open access:01 February 2022

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