Assessing the tension between a black hole dominated early universe and
  leptogenesis
  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, $10^6{\rm~GeV} \lesssim
M_{N} \lesssim 10^{9}{\rm~GeV}$, 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 $M_i \gtrsim
\mathcal{O}\left(1\right)$ kg. Detection of the gravitational waves emitted
from the same primordial black holes would place intermediate-scale thermal
leptogenesis under tension.
