Failure of stability of a maximal operator bound for perturbed Nevo-Thangavelu means

Jaehyeon Ryu, Andreas Seeger

Let $G$ be a two-step nilpotent Lie group, identified via the exponential map with the Lie-algebra $\mathfrak{g}={\mathfrak{g}}_1\oplus {\mathfrak{g}}_2$, where $[\mathfrak g,\mathfrak g]\…