ER Toward Typical EPR

Do typical black hole microstates have semiclassical interiors? I will present a constructive approach to this question, where we prepare ensembles of black hole interiors with long wormholes using Brownian matter sources. Evaluating the frame potentials of the ensembles with the gravitational path integral, I will show that the ensembles become quantitatively generic. I will derive a correspondence between the degree of randomness of the ensembles and the average geometric length of the wormhole. This correspondence constitutes a ``complexity=geometry'' relation.