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We propose a scenario where dark matter (DM) with a wide mass range from afew keV to PeV can be produced solely from evaporating primordial black holes(PBH), while being consistent with the required free streaming length forstructure formation. If DM does not have any other interactions apart fromgravity and the universe has a PBH dominated phase at early epoch, then PBHevaporation typically leads to overproduction of DM in this mass range. Byincorporating this gravitational DM within a Type-I seesaw scenario with threeright handed neutrinos (RHN), we bring the abundance of PBH generated DM withinobserved limits by late entropy injection due to decay of one of the RHNs,acting as the diluter. The diluter, due to its feeble coupling with the bathparticles, gets produced primarily from the PBH evaporation thereby leading tothe second stage of early matter domination after the end of PBH dominated era.The other two RHNs contribute to the origin of light neutrino mass and alsolead to the observed baryon asymmetry via leptogenesis with contributions fromboth thermally and PBH generated RHNs. The criteria of DM relic and baryonasymmetry can be satisfied simultaneously if DM mass gets restricted to aballpark in the MeV-GeV regime with the requirement of resonant leptogenesisfor heavier DM mass in order to survive the large entropy dilution at lateepochs.

Cogenesis of Baryon Asymmetry and Gravitational Dark Matter from Primordial Black Holes