Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-04-24
Phys. Rev. E 64, 020102-1
Physics
Condensed Matter
Statistical Mechanics
5 pages, 3 figures
Scientific paper
10.1103/PhysRevE.64.020102
We study a one-dimensional lattice random walk with an absorbing boundary at the origin and a movable partial reflector. On encountering the reflector, at site x, the walker is reflected (with probability r) to x-1 and the reflector is simultaneously pushed to x+1. Iteration of the transition matrix, and asymptotic analysis of the probability generating function show that the critical exponent delta governing the survival probability varies continuously between 1/2 and 1 as r varies between 0 and 1. Our study suggests a mechanism for nonuniversal kinetic critical behavior, observed in models with an infinite number of absorbing configurations.
ben-Avraham Daniel
Dickman Ronald
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