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Growing networks with preferential addition and deletion ...
Maria Deijfen, Mathias Lindholm · 2015-09-23 · via cs.SI updates on arXiv.org

A preferential attachment model for a growing network incorporating deletion of edges is studied and the expected asymptotic degree distribution is analyzed. At each time step $t=1,2,\ldots$, with probability $π_1>0$ a new vertex with one edge attached to it is added to the network and the edge is connected to an existing vertex chosen proportionally to its degree, with probability $π_2$ a vertex is chosen proportionally to its degree and an edge is added between this vertex and a randomly chosen other vertex, and with probability $π_3=1-π_1-π_2<1/2$ a vertex is chosen proportionally to its degree and a random edge of this vertex is deleted. The model is intended to capture a situation where high-degree vertices are more dynamic than low-degree vertices in the sense that their connections tend to be changing. A recursion formula is derived for the expected asymptotic fraction $p_k$ of vertices with degree $k$, and solving this recursion reveals that, for $π_3<1/3$, we have $p_k\sim k^{-(3-7π_3)/(1-3π_3)}$, while, for $π_3>1/3$, the fraction $p_k$ decays exponentially at rate $(π_1+π_2)/2π_3$. There is hence a non-trivial upper bound for how much deletion the network can incorporate without loosing the power-law behavior of the degree distribution. The analytical results are supported by simulations.