Energy relations for the generalised Vladimirov derivative via Bruhat-Tits tree extensions

Abstract

We formulate a proof on non-Archimedean analogue of the Caffarelli-Silvestre extension for fractional Laplacian on the Bruhat-Tits tree $T_p$ in terms of energy relations after identifying $\partial T_p$ with ${\mathbb{P}}^1({\mathbb{Q}}_p)$, which reproduces the generalised Vladimirov derivative of the rescaled boundary function.