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- W2113752843 abstract "We study a particle system with hopping (random walk) dynamics on the integer lattice ℤd. The particles can exist in two states, active or inactive (sleeping); only the former can hop. The dynamics conserves the number of particles; there is no limit on the number of particles at a given site. Isolated active particles fall asleep at rate λ>0, and then remain asleep until joined by another particle at the same site. The state in which all particles are inactive is absorbing. Whether activity continues at long times depends on the relation between the particle density ζ and the sleeping rate λ. We discuss the general case, and then, for the one-dimensional totally asymmetric case, study the phase transition between an active phase (for sufficiently large particle densities and/or small λ) and an absorbing one. We also present arguments regarding the asymptotic mean hopping velocity in the active phase, the rate of fixation in the absorbing phase, and survival of the infinite system at criticality. Using mean-field theory and Monte Carlo simulation, we locate the phase boundary. The phase transition appears to be continuous in both the symmetric and asymmetric versions of the process, but the critical behavior is very different. The former case is characterized by simple integer or rational values for critical exponents (β=1, for example), and the phase diagram is in accord with the prediction of mean-field theory. We present evidence that the symmetric version belongs to the universality class of conserved stochastic sandpiles, also known as conserved directed percolation. Simulations also reveal an interesting transient phenomenon of damped oscillations in the activity density." @default.
- W2113752843 created "2016-06-24" @default.
- W2113752843 creator A5015232732 @default.
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- W2113752843 date "2010-01-22" @default.
- W2113752843 modified "2023-10-18" @default.
- W2113752843 title "Activated Random Walkers: Facts, Conjectures and Challenges" @default.
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- W2113752843 doi "https://doi.org/10.1007/s10955-009-9918-7" @default.
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