Strong-coupling behaviour in discrete Kardar-Parisi-Zhang equations

Details Strong-coupling behaviour in discrete Kardar-Parisi-Zhang equations Strong-coupling behaviour in discrete Kardar-Parisi-Zhang equations

1996-04-11

arxiv.org/abs/cond-mat/9604071v1

J. Phys. A 29, 7917 (1996)

Physics

Condensed Matter

21 pages, revtex, 2 figures, submitted to J. Phys. A

Scientific paper

10.1088/0305-4470/29/24/016

We present a systematic discretization scheme for the Kardar-Parisi-Zhang (KPZ) equation, which correctly captures the strong-coupling properties of the continuum model. In particular we show that the scheme contains no finite-time singularities in contrast to conventional schemes. The implications of these results to i) previous numerical integration of the KPZ equation, and ii) the non-trivial diversity of universality classes for discrete models of `KPZ-type' are examined. The new scheme makes the strong-coupling physics of the KPZ equation more transparent than the original continuum version and allows the possibility of building new continuum models which may be easier to analyse in the strong-coupling regime.

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