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We perform the first numerical calculation of the interplay between thermaland black hole induced leptogenesis, demonstrating that the right-handedneutrino surplus produced during the evaporation only partially mitigates theentropy dilution suffered by the thermal component. As such, theintermediate-mass regime of the right-handed neutrinos, $10^6{\rm~GeV} \lesssimM_{N} \lesssim 10^{9}{\rm~GeV}$, could not explain the observed baryonasymmetry even for fine-tuned scenarios if there existed a primordial blackhole dominated era, consistent with initial black hole masses of $M_i \gtrsim\mathcal{O}\left(1\right)$ kg. Detection of the gravitational waves emittedfrom the same primordial black holes would place intermediate-scale thermalleptogenesis under tension.

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