Pair contact process with diffusion of pairs

Details Pair contact process with diffusion of pairs Pair contact process with diffusion of pairs

2011-01-18

arxiv.org/abs/1101.3509v1

Physics

Condensed Matter

Statistical Mechanics

9 pages, 3 figures

Scientific paper

The pair contact process (PCP) is a nonequilibrium stochastic model which, like the basic contact process (CP), exhibits a phase transition to an absorbing state. The two models belong to the directed percolation (DP) universality class, despite the fact that the PCP possesses infinitely many absorbing configurations whereas the CP has but one. The critical behavior of the PCP with hopping by particles (PCPD) is as yet unclear. Here we study a version of the PCP in which nearest-neighbor particle {\it pairs} can hop but individual particles cannot. Using quasistationary simulations for three values of the diffusion probability ($D=0.1$, 0.5 and 0.9), we find convincing evidence of DP-like critical behavior.

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