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- W1965718195 abstract "We study the absorbing phase transitions in coupled directed percolation (DP) processes with $N$-species particles in one dimension. The interspecies coupling is linear, bidirectional, and excitatory. We find that the presence of a spontaneous annihilation process $Aensuremath{rightarrow}0$ is essential in stabilizing the absorbing phase (vacuum). In the coupled contact processes, the vacuum is stable and the system exhibits DP type transitions, regardless of the coupling strength, for all $N$. However, in the coupled branching annihilation random walks with one offspring (BAW), where particle annihilations occur only through binary diffusion processes $A+Aensuremath{rightarrow}0$, the vacuum becomes unstable with respect to an arbitrarily small branching rate in a sufficiently strong coupling regime for $Nensuremath{geqslant}3$. The $N=2$ BAW exhibits the DP type transition for any coupling strength, but the inclusion of interspecies hard core (HC) interaction makes the vacuum unstable again and the system is always active in a strong coupling regime. Critical behavior near the zero branching point is characterized by the mean-field scaling exponents, $ensuremath{beta}={ensuremath{nu}}_{ensuremath{perp}}=1∕2$ and ${ensuremath{nu}}_{ensuremath{Vert}}=1$, regardless of the presence of HC interaction. We also discuss the effects of the asymmetric coupling." @default.
- W1965718195 created "2016-06-24" @default.
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- W1965718195 date "2004-06-16" @default.
- W1965718195 modified "2023-10-11" @default.
- W1965718195 title "Stability of vacuum in coupled directed percolation processes" @default.
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- W1965718195 doi "https://doi.org/10.1103/physreve.69.066125" @default.
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