Riesz transform and spectral multipliers for the flow Laplacian on nonhomogeneous trees

Alessio Martini, Federico Santagati, Anita Tabacco +1

Let $T$ be a locally finite tree equipped with a flow measure $m$. Let $\mathcal{L}$ be the flow Laplacian on $(T,m)$. We prove that the first order Riesz transform $\nabla \mathcal…