Quasiextremal primordial black holes are a viable dark matter candidate

Black hole evaporation is generally considered inevitable for low-mass black holes, yet there is no confirmation of this remarkable hypothesis. Here, we propose a phenomenological model that appeals to the possible survival of light quasiextremal primordial black holes as a significant dark matter component and show that the related cosmological and astrophysical constraints disappear for reasonable degrees of quasiextremality. The results obtained are general, conservative, and should be taken as a proof of principle for future, model-specific analyses.

Automated summary

This paper proposes a phenomenological model regarding the survival of primordial black holes as a significant dark matter component, showing that cosmological and astrophysical constraints disappear under reasonable degrees of quasiextremality.