Overdetermined problems in groups of Heisenberg type: Conjectures and partial results

In this paper we formulate some conjectures in sub-Riemannian geometry concerning a characterisation of the KoranyiKaplan ball in a group of Heisenberg type through the existence of a solution to suitably overdetermined problems. We prove an integral identity that provides a rigidity constraint for one of the two problems. By exploiting some new invariances of these Lie groups, for domains having partial symmetry we solve these problems by converting them to known results for the classical p- Laplacian. (c) 2024 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http:// creativecommons .org /licenses /by /4 .0/).