Interfacial Velocity Corrections due to Multiplicative Noise

Details Interfacial Velocity Corrections due to Multiplicative Noise Interfacial Velocity Corrections due to Multiplicative Noise

1998-11-02

arxiv.org/abs/cond-mat/9811020v1

Physics

Condensed Matter

Soft Condensed Matter

6 eps figures; submitted to Phys. Rev. E

Scientific paper

10.1103/PhysRevE.59.3893

The problem of velocity selection for reaction fronts has been intensively investigated, leading to the successful marginal stability approach for propagation into an unstable state. Because the front velocity is controlled by the leading edge which perforce has low density, it is interesting to study the role that finite particle number fluctuations have on this picture. Here, we use the well-known mapping of discrete Markov processes to stochastic differential equations and focus on the front velocity in the simple $A+A \stackrel{\leftarrow}{\to} A$ system. Our results are consistent with a recent (heuristic) proposal that $v_{MS} - v \sim {1\over \ln^2 {N}}$.

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