Walk dimension and vanishing curve modulus in metric measure spaces

Abstract

We prove that, on a regular local $p$-Dirichlet space supporting a $p$-Poincaré inequality, if the $p$-walk dimension is strictly greater than $p$, then every curve family has zero $p$-modulus. As a consequence, we show that no Ahlfors-regular metric space equipped with a sub-Gaussian heat kernel is minimal for its Ahlfors-regular conformal dimension.