Controlling One-Dimensional Langevin Dynamics on the Lattice


Physical Review D 60 105039 (1999)

Luis Bettencourt and Salman Habib

T8
Los Alamos National Laboratory
NM87545, USA.

G.D. Lythe

Centre for Nonlinear Studies
Los Alamos National Laboratory
NM87545, USA.

Abstract

Stochastic evolutions of classical field theories have recently become popular in the study of problems such as determination of the rates of topological transitions and the statistical mechanics of nonlinear coherent structures. To obtain high precision results from numerical calculations, a careful accounting of spacetime discreteness effects is essential, as well as the development of schemes to systematically improve convergence to the continuum. With a kink-bearing Ø4 field theory as the application arena, we present such an analysis for a 1+1-dimensional Langevin system. High resolution numerical results provide excellent supporting evidence for our analytical predictions.

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