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A variety of scenarios for early-universe cosmology give rise to a populationof primordial black holes (PBHs) with a broad spectrum of masses. Theevaporation of PBHs in such scenarios has the potential to place the universeinto an extended period of "stasis" during which the abundances of matter andradiation remain absolutely constant despite cosmological expansion. Thissurprising phenomenon can give rise to new possibilities for early-universedynamics and lead to distinctive signatures of the evaporation of such PBHs. Inthis paper, we discuss how this stasis epoch arises and explore a number of itsphenomenological consequences, including implications for inflationaryobservables, the stochastic gravitational-wave background, baryogenesis, andthe production of dark matter and dark radiation.

Primordial Black Holes Place the Universe in Stasis