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Eigenvalues and Spectral Dimension of Random Geometric Graphs in Thermodynamic Regime

Abstract : Network geometries are typically characterized by having a finite spectral dimension (SD), that characterizes the return time distribution of a random walk on a graph. The main purpose of this work is to determine the SD of a variety of random graphs called random geometric graphs (RGGs) in the thermodynamic regime, in which the average vertex degree is constant. The spectral dimension depends on the eigenvalue density (ED) of the RGG normalized Laplacian in the neighborhood of the minimum eigenvalues. In fact, the behavior of the ED in such a neighborhood characterizes the random walk. Therefore, we first provide an analytical approximation for the eigenvalues of the regularized normalized Laplacian matrix of RGGs in the thermodynamic regime. Then, we show that the smallest non zero eigenvalue converges to zero in the large graph limit. Based on the analytical expression of the eigenvalues, we show that the eigenvalue distribution in a neighborhood of the minimum value follows a power-law tail. Using this result, we find that the SD of RGGs is approximated by the space dimension d in the thermodynamic regime.
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https://hal.inria.fr/hal-02397383
Contributor : Konstantin Avrachenkov <>
Submitted on : Friday, December 6, 2019 - 3:02:44 PM
Last modification on : Tuesday, January 21, 2020 - 11:00:14 AM
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Konstantin Avrachenkov, Laura Cottatellucci, Mounia Hamidouche. Eigenvalues and Spectral Dimension of Random Geometric Graphs in Thermodynamic Regime. Complex Networks 2019 - 8th International Conference on Complex Networks and Their Applications, Dec 2019, Lisbon, Portugal. ⟨10.1007/978-3-030-36687-2_80⟩. ⟨hal-02397383⟩

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