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Giant Component in Random Multipartite Graphs with given Degree Sequences

Author(s)
Gamarnik, David; Misra, Sidhant
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Abstract
We study the problem of the existence of a giant component in a random multipartite graph. We consider a random multipartite graph with p parts generated according to a given degree sequence n[superscript d][subscript i](n),n≥1 which denotes the number of vertices in part i of the multipartite graph with degree given by the vector d in an n-node graph. We assume that the empirical distribution of the degree sequence converges to a limiting probability distribution. Under certain mild regularity assumptions, we characterize the conditions under which, with high probability, there exists a component of linear size. The characterization involves checking whether the Perron-Frobenius norm of the matrix of means of a certain associated edge-biased distribution is greater than unity. We also specify the size of the giant component when it exists. We use the exploration process of Molloy and Reed Molloy and Reed (1995) to analyze the size of components in the random graph. The main challenges arise due to the multidimensionality of the random processes involved which prevents us from directly applying the techniques from the standard unipartite case. In this paper we use techniques from the theory of multidimensional Galton-Watson processes along with Lyapunov function technique to overcome the challenges.
Date issued
2015-10
URI
http://hdl.handle.net/1721.1/120800
Department
Sloan School of Management
Journal
Stochastic Systems
Publisher
Institute for Operations Research and the Management Sciences (INFORMS)
Citation
Gamarnik, David and Sidhant Misra. “Giant Component in Random Multipartite Graphs with Given Degree Sequences.” Stochastic Systems 5, 2 (December 2015): 372–408 © 2015 Informs
Version: Original manuscript
ISSN
1946-5238

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