Isoperimetric Sets and p-Cheeger Sets are in Bijection

Abstract

Given an open, bounded, planar set Omega , we consider its p-Cheeger sets and its isoperimetric sets. We study the set-valued map mathfrak {V}:[1/2,+infty )rightarrow mathcal {P}((0,|Omega |]) associating to each p the set of volumes of p-Cheeger sets. We show that whenever Omega satisfies some geometric structural assumptions (convex sets are encompassed), the map is injective, and continuous in terms of Gamma -convergence. Moreover, when restricted to (1/2, 1) such a map is univalued and is in bijection with its image. As a consequence of our analysis we derive some fine boundary regularity result.