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From cellular automata to growth dynamics: The Kardar-Parisi-Zhang universality class
Waldenor P Gomes1, André L A Penna1,2, Fernando A Oliveira1,2
1Instituto de Física, Universidade de Brasília, Brazil.
Abstract:
We demonstrate that in the continuous limit the etching mechanism yields the Kardar-Parisi-Zhang (KPZ) equation in a (d+1)-dimensional space. We show that the parameters ν, associated with the surface tension, and λ, associated with the nonlinear term of the KPZ equation, are not phenomenological, but rather they stem from a new probability distribution function. The Galilean invariance is recovered independently of d, and we illustrate this via very precise numerical simulations. We obtain firsthand the coupling parameter as a function of the probabilities. In addition, we strengthen the argument that there is no upper critical limit for the KPZ equation.
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