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Published online by Cambridge University Press: 11 October 2023
Let $l\in \mathbb {N}_{\ge 1}$ and
$\alpha : \mathbb {Z}^l\rightarrow \text {Aut}(\mathscr {N})$ be an action of
$\mathbb {Z}^l$ by automorphisms on a compact nilmanifold
$\mathscr{N}$. We assume the action of every
$\alpha (z)$ is ergodic for
$z\in \mathbb {Z}^l\smallsetminus \{0\}$ and show that
$\alpha $ satisfies exponential n-mixing for any integer
$n\geq 2$. This extends the results of Gorodnik and Spatzier [Mixing properties of commuting nilmanifold automorphisms. Acta Math. 215 (2015), 127–159].