Dynamical fitness models
evidence of universality classes for preferential attachment graphs
Alessandra Cipriani (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Andrea Fontanari (TU Delft - Electrical Engineering, Mathematics and Computer Science, Centrum Wiskunde & Informatica (CWI))
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Abstract
In this paper we define a family of preferential attachment models for random graphs with fitness in the following way: independently for each node, at each time step a random fitness is drawn according to the position of a moving average process with positive increments. We will define two regimes in which our graph reproduces some features of two well-known preferential attachment models: the Bianconi-Barabási and Barabási-Albert models. We will discuss a few conjectures on these models, including the convergence of the degree sequence and the appearance of Bose-Einstein condensation in the network when the drift of the fitness process has order comparable to the graph size.