中科院数学与系统科学研究院

数学研究所

偏微分方程研讨班

报告人：Dr. Wang minmin(University of Bath)

题  目：Scaling limits of critical inhomogeneous random graphs

时  间：2018.07.11（星期三）, 10:30-11:30

地  点：数学院南楼N820室

摘 要：Branching processes are known to be useful tools in the study of random graphs, in particular in understanding the phenomenon of a phase transition in the sizes of the largest clusters of the graphs. Recently, growing interests are paid to inhomogeneous random graphs. In this talk, we look at one particular model, called the Poisson random graph, where edges are formed with probabilities proportional to some prescribes weights on the vertices. One challenge in the study of inhomogeneous random graphs is to describe the geometry of the graphs around the critical point. In the case of Poisson random graph, we obtain a simple representation of the graph using Galton-Watson trees (genealogy trees of branching processes). Relying on this representation and previous works of Duquesne & Le Gall on the convergence of Galton-Watson trees, we prove that in the critical window, the scaling limits of the largest components of the Poisson random graphs form a family of almost-tree-like compact metric spaces, which can be constructed explicitly from the so-called Levy processes without replacement. Based on a joint work with Nicolas Broutin and Thomas Duquesne.