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Primordial black holes forming during kination: the trapped, the overdense, and the void
We study primordial black hole (PBH) formation in a single field model which passes from slow roll, through a transient ultra slow roll phase, into kination. Nonlinear numerical relativity simulations are used to follow localised, initially sub Hubble field fluctuations across the non attractor transition, to determine the resulting super Hubble curvature profiles, and subsequently to evolve their re entry during ...