On the dichotomy of $p$-walk dimensions on metric measure spaces

Abstract

On a volume doubling metric measure space endowed with a family of $p$-energies such that the Poincar\'e inequality and the cutoff Sobolev inequality with $p$-walk dimension $\beta_p$ hold, for $p$ in an open interval $I\subseteq (1,+\infty)$, we prove the following dichotomy: either $\beta_p=p$ for all $p\in I$, or $\beta_p>p$ for all $p\in I$.