Contractibility of moduli spaces of RCD(0,2)-structures

Abstract

This paper focuses on RCD(0,2)-spaces, which can be thought of as possibly non-smooth metric measure spaces with non-negative Ricci curvature and dimension less than 2. First, we establish a list of the compact topological spaces admitting an RCD(0,2)-structure. Then, we describe the associated moduli space of RCD(0,2)-structures for each of them. In particular, we show that all these moduli spaces are contractible.