On coprime percolation, the visibility graphon, and the local limit of the GCD profile

Abstract

Colour an element of $\mathbb{Z}^d$ white if its coordinates are coprime and black otherwise. What does this colouring look like when seen from a "uniformly chosen" point of $\mathbb{Z}^d$? More generally, label every element of $\mathbb{Z}^d$ by its GCD: what do the labels look like around a "uniform" point of $\mathbb{Z}^d$? We answer these questions and generalisations of them, provide results of graphon convergence, as well as a "local/graphon" convergence. One can also investigate the percolative properties of the colouring under study.