Canonical phase space approach to the noisy Burgers equation: Probability distributions

Details Canonical phase space approach to the noisy Burgers equation: Probability distributions Canonical phase space approach to the noisy Burgers equation: Probability distributions

1999-01-04

arxiv.org/abs/cond-mat/9901010v1

Physics

Condensed Matter

Statistical Mechanics

18 pages Revtex file, including 8 eps-figures, submitted to Phys. Rev. E

Scientific paper

10.1103/PhysRevE.59.5065

We present a canonical phase space approach to stochastic systems described by Langevin equations driven by white noise. Mapping the associated Fokker-Planck equation to a Hamilton-Jacobi equation in the nonperturbative weak noise limit we invoke a {\em principle of least action} for the determination of the probability distributions. We apply the scheme to the noisy Burgers and KPZ equations and discuss the time-dependent and stationary probability distributions. In one dimension we derive the long-time skew distribution approaching the symmetric stationary Gaussian distribution. In the short-time region we discuss heuristically the nonlinear soliton contributions and derive an expression for the distribution in accordance with the directed polymer-replica and asymmetric exclusion model results. We also comment on the distribution in higher dimensions.

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