A Berkovich Approach to Perfectoid Spaces

Since their inception perfectoid spaces have catalyzed a revolution in p-adic geometry. We redevelop the foundations of perfectoid spaces from the point of view of Berkovich Spaces, where the underlying topological space of an affinoid perfectoid space is a compact Hausdorff space – closely resembling the situation in complex geometry. The key technical ingredient in our construction is arc_pi-descent for perfectoid Banach algebras. Along the way, we establish various foundational results for arc_pi-sheaves, notably a form of the Gerritzen-Grauert theorem.