Mean-field behaviour of the random connection model on hyperbolic space

Matthew Dickson, Markus Heydenreich

Published 2025-05-13Version 1

We study the random connection model on hyperbolic space $\mathbb{H}^d$ in dimension $d=2,3$. Vertices of the spatial random graph are given as a Poisson point process with intensity $\lambda>0$. Upon variation of $\lambda$ there is a percolation phase transition: there exists a critical value $\lambda_c>0$ such that for $\lambda<\lambda_c$ all clusters are finite, but infinite clusters exist for $\lambda>\lambda_c$. We identify certain critical exponents that characterize the clusters at (and near) $\lambda_c$, and show that they agree with the mean-field values for percolation. We derive the exponents through isoperimetric properties of critical percolation clusters rather than via a calculation of the triangle diagram.