Tree Capacity and Splitting Isometries for Subinvariant Kernels
Probability
2026-02-13 v1 Functional Analysis
Abstract
Starting from a subinvariant positive definite kernel under a branching pullback, we attach to the resulting kernel tower a canonical electrical network on the word tree whose edge weights are the diagonal increments. This converts diagonal growth into effective resistance and capacity, giving explicit criteria and quantitative bounds, together with a matching upper bound under a mild level regularity condition. When the diagonal tower has finite limit at a point, we prove convergence of the full kernels and obtain an invariant completion with a minimality property. We also describe the associated RKHS splitting and a boundary martingale construction leading to weighted invariant majorants.
Cite
@article{arxiv.2602.11859,
title = {Tree Capacity and Splitting Isometries for Subinvariant Kernels},
author = {James Tian},
journal= {arXiv preprint arXiv:2602.11859},
year = {2026}
}