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Zbl 1191.82028
Athreya, Siva R.; Swart, Jan M.
Survival of contact processes on the hierarchical group. (English)
[J] Probab. Theory Relat. Fields 147, No. 3-4, 529-563 (2010). ISSN 0178-8051; ISSN 1432-2064/e

Summary: We consider contact processes on the hierarchical group, where sites infect other sites at a rate depending on their hierarchical distance, and sites become healthy with a constant recovery rate. If the infection rates decay too fast as a function of the hierarchical distance, then we show that the critical recovery rate is zero. On the other hand, we derive sufficient conditions on the speed of decay of the infection rates for the process to exhibit a nontrivial phase transition between extinction and survival. For our sufficient conditions, we use a coupling argument that compares contact processes on the hierarchical group with freedom two with contact processes on a renormalized lattice. An interesting novelty in this renormalization argument is the use of a result due to Rogers and Pitman on Markov functionals.

MSC 2000:: *82C20 Dynamic lattice systems
60K35 Interacting random processes
82C28 Dynamic renormalization group methods
92D30 Epidemiology
60J25 Markov processes with continuous parameter

Keywords: contact process; survival; hierarchical group; coupling; renormalization group

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