Static critical behavior in the inactive phase of the pair contact process

Details Static critical behavior in the inactive phase of the pair contact process Static critical behavior in the inactive phase of the pair contact process

2001-09-03

arxiv.org/abs/cond-mat/0109024v1

Physics

Condensed Matter

4 pages revtex (twocolumn, psfig), 3 EPS figures

Scientific paper

10.1103/PhysRevE.65.016111

Steady state properties in the absorbing phase of the $1d$ pair contact process (PCP) model are investigated. It is shown that, in typical absorbing states (reached by the system's dynamic rules), the density of isolated particles, $\rho_1$, approaches a stationary value which depends on the annihilation probability ($p$); the deviation from its 'natural' value at criticality, $\rho_1^{nat}$, follows a power law: $\rho_1^{nat}-\rho_1 \sim (p-p_c)^{\beta_1}$ for $p>p_c$. Monte Carlo simulations yield $\beta_1=0.81$. A cluster approximation is developed for this model, qualitatively confirming the numerical results and predicting $\beta_1=1$. The singular behavior of the isolated particles density in the inactive phase is explained using a phenomenological approach.

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