On the ergodic theory of the real Rel foliation

Abstract: Let $\mathcal{H}$ be a stratum of translation surfaces with at least two singularities, let $m_{\mathcal{H}}$ denote the Masur-Veech measure on $\mathcal{H}$, and let $Z_0$ be a flow on $(\mathcal{H}, m_{\mathcal{H}})$ obtained by integrating a Rel vector field. We prove that $Z_0$ is mixing of all orders, and in particular is ergodic. We also characterize the ergodicity of flows defined by Rel vector field, for more general spaces $(\mathcal{L}, m_{\mathcal{L}})$, where $\mathcal{L} \subset \mathcal{H}$ is an orbit-closure for the action of $G = \mathrm{SL}2(\mathbb{R})$ (i.e., an affine invariant subvariety) and $m{\mathcal{L}}$ is the natural measure. Our results are conditional on a forthcoming measure classification result of Brown, Eskin, Filip and Rodriguez-Hertz.We also prove that the entropy of the action of $Z_0$ on $(\mathcal{L}, m_{\mathcal{L})$ has zero entropy.