Numerical schemes for continuum models of reaction-diffusion systems subject to internal noise

Details Numerical schemes for continuum models of reaction-diffusion systems subject to internal noise Numerical schemes for continuum models of reaction-diffusion systems subject to internal noise

2004-04-26

arxiv.org/abs/cond-mat/0404583v3

Physical Review E 70, 045102(R) (2004)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 3 figures, Accepted for publication in Physical Review E as a Rapid Communication

Scientific paper

10.1103/PhysRevE.70.045102

We present new numerical schemes to integrate stochastic partial differential equations which describe the spatio-temporal dynamics of reaction-diffusion (RD) problems under the effect of internal fluctuations. The schemes conserve the nonnegativity of the solutions and incorporate the Poissonian nature of internal fluctuations at small densities, their performance being limited by the level of approximation of density fluctuations at small scales. We apply the new schemes to two different aspects of the Reggeon model namely, the study of its non-equilibrium phase transition and the dynamics of fluctuating pulled fronts. In the latter case, our approach allows to reproduce quantitatively for the first time microscopic properties within the continuum model.

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