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Local limits of spatial inhomogeneous random graphs

Published online by Cambridge University Press:  14 April 2023

Remco van der Hofstad*
Affiliation:
Eindhoven University of Technology
Pim van der Hoorn*
Affiliation:
Eindhoven University of Technology
Neeladri Maitra*
Affiliation:
Eindhoven University of Technology
*
*Postal address: Department of Mathematics and Computer Science, MetaForum, Eindhoven University of Technology, Eindhoven 5612 AZ, the Netherlands.
*Postal address: Department of Mathematics and Computer Science, MetaForum, Eindhoven University of Technology, Eindhoven 5612 AZ, the Netherlands.
*Postal address: Department of Mathematics and Computer Science, MetaForum, Eindhoven University of Technology, Eindhoven 5612 AZ, the Netherlands.

Abstract

Consider a set of n vertices, where each vertex has a location in $\mathbb{R}^d$ that is sampled uniformly from the unit cube in $\mathbb{R}^d$, and a weight associated to it. Construct a random graph by placing edges independently for each vertex pair with a probability that is a function of the distance between the locations and the vertex weights.

Under appropriate integrability assumptions on the edge probabilities that imply sparseness of the model, after appropriately blowing up the locations, we prove that the local limit of this random graph sequence is the (countably) infinite random graph on $\mathbb{R}^d$ with vertex locations given by a homogeneous Poisson point process, having weights which are independent and identically distributed copies of limiting vertex weights. Our set-up covers many sparse geometric random graph models from the literature, including geometric inhomogeneous random graphs (GIRGs), hyperbolic random graphs, continuum scale-free percolation, and weight-dependent random connection models.

We prove that the limiting degree distribution is mixed Poisson and the typical degree sequence is uniformly integrable, and we obtain convergence results on various measures of clustering in our graphs as a consequence of local convergence. Finally, as a byproduct of our argument, we prove a doubly logarithmic lower bound on typical distances in this general setting.

Type
Original Article
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of Applied Probability Trust

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