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Two phase transitions for the contact process on small worlds

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  • Durrett, Rick
  • Jung, Paul

Abstract

In our version of Watts and Strogatz's small world model, space is a d-dimensional torus in which each individual has in addition exactly one long-range neighbor chosen at random from the grid. This modification is natural if one thinks of a town where an individual's interactions at school, at work, or in social situations introduce long-range connections. However, this change dramatically alters the behavior of the contact process, producing two phase transitions. We establish this by relating the small world to an infinite "big world" graph where the contact process behavior is similar to the contact process on a tree. We then consider the contact process on a slightly modified small world model in order to show that its behavior is decidedly different from that of the contact process on a tree.

Suggested Citation

  • Durrett, Rick & Jung, Paul, 2007. "Two phase transitions for the contact process on small worlds," Stochastic Processes and their Applications, Elsevier, vol. 117(12), pages 1910-1927, December.
    • Handle: RePEc:eee:spapps:v:117:y:2007:i:12:p:1910-1927
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    References listed on IDEAS

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    1. Lalley, Steven P. & Sellke, Thomas M., 2002. "Anisotropic contact processes on homogeneous trees," Stochastic Processes and their Applications, Elsevier, vol. 101(2), pages 163-183, October.
    2. M. E. J. Newman & D. J. Watts, 1999. "Renormalization Group Analysis of the Small-World Network Model," Working Papers 99-04-029, Santa Fe Institute.
    3. Madras, Neal & Schinazi, Rinaldo, 1992. "Branching random walks on trees," Stochastic Processes and their Applications, Elsevier, vol. 42(2), pages 255-267, September.
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    Cited by:

    1. Bertacchi, Daniela & Borrello, Davide, 2011. "The small world effect on the coalescing time of random walks," Stochastic Processes and their Applications, Elsevier, vol. 121(5), pages 925-956, May.
    2. Mountford, Thomas & Mourrat, Jean-Christophe & Valesin, Daniel & Yao, Qiang, 2016. "Exponential extinction time of the contact process on finite graphs," Stochastic Processes and their Applications, Elsevier, vol. 126(7), pages 1974-2013.

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