A matrix perturbation view of the small world phenomenon, SIAM Review SIGEST section
Higham, D.J. (2007) A matrix perturbation view of the small world phenomenon, SIAM Review SIGEST section. SIAM Review, 49 (1). pp. 91108. ISSN 00361445
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We use techniques from applied matrix analysis to study small world cutoff in a Markov chain. Our model consists of a periodic random walk plus uniform jumps. This has a direct interpretation as a teleporting random walk, of the type used by search engines to locate web pages, on a simple ring network. More loosely, the model may be regarded as an analogue of the original small world network of Watts and Strogatz [Nature, 393 (1998), pp. 440442]. We measure the small world property by expressing the mean hitting time, averaged over all states, in terms of the expected number of shortcuts per random walk. This average mean hitting time is equivalent to the expected number of steps between a pair of states chosen uniformly at random. The analysis involves nonstandard matrix perturbation theory and the results come with rigorous and sharp asymptotic error estimates. Although developed in a different context, the resulting cutoff diagram agrees closely with that arising from the meanfield network theory of Newman, Moore, and Watts [Phys. Rev. Lett., 84 (2000), pp. 32013204].
ORCID iDs
Higham, D.J. ORCID: https://orcid.org/0000000266353461;

Item type: Article ID code: 4548 Dates: DateEvent2007PublishedKeywords: google, Markov chain, matrix perturbation, mean hitting time, optional sampling theorem, partially random graph, random walk, ShermanMorrison formula, teleporting, web search engine, Probabilities. Mathematical statistics, Mathematics, Computational Mathematics, Theoretical Computer Science, Applied Mathematics Subjects: Science > Mathematics > Probabilities. Mathematical statistics
Science > MathematicsDepartment: Faculty of Science > Mathematics and Statistics Depositing user: Strathprints Administrator Date deposited: 01 Nov 2007 Last modified: 05 Mar 2021 04:09 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/4548