Local weak limits for collapsed branching processes with random out-degrees

Sayan Banerjee, Prabhanka Deka and Mariana Olvera-Cravioto

Stochastic Processes and their Applications, 2025, vol. 182, issue C

Abstract: We obtain local weak limits in probability for Collapsed Branching Processes (CBP), which are directed random networks obtained by collapsing random-sized families of individuals in a general continuous-time branching process. The local weak limit of a given CBP, as the network grows, is shown to be a related continuous-time branching process stopped at an independent exponential time. The proof involves the construction of an explicit coupling of the in-components of vertices with the limiting object. We also show that the in-components of a finite collection of uniformly chosen vertices locally weakly converge (in probability) to i.i.d. copies of the above limit, reminiscent of propagation of chaos in interacting particle systems. We obtain as special cases novel descriptions of the local weak limits of directed preferential and uniform attachment models. We also outline some applications of our results for analyzing the limiting in-degree and PageRank distributions. In particular, upper and lower bounds on the tail of the in-degree distribution are obtained and a phase transition is detected in terms of the growth rate of the attachment function governing reproduction rates in the branching process.

Keywords: Local weak limit; Collapsed branching processes; Continuous-time branching processes; Random out-degrees; Couplings; Directed preferential attachment; In-degree; PageRank; Power laws (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.spa.2025.104566

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