Abstract
We study interacting spin (particle) systems on a lattice under the combined influence of spin flip (Glauber) and simple exchange (Kawasaki) dynamics. We prove that when the particle-conserving exchanges (stirrings) occur on a fast time scale of order ɛ−2 the macroscopic density, defined on spatial scale ɛ−1, evolves according to an autonomous nonlinear diffusion-reaction equation. Microscopic fluctuations about the deterministic macroscopic evolution are found explicitly. They grow, with time, to become infinite when the deterministic solution is unstable.
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This work was supported by NSF Grant DMR81-14726-02.
Partially supported by CNR.
Partially supported by CNPq Grant No. 201682-83.
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De Masi, A., Ferrari, P.A. & Lebowitz, J.L. Reaction-diffusion equations for interacting particle systems. J Stat Phys 44, 589–644 (1986). https://doi.org/10.1007/BF01011311
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DOI: https://doi.org/10.1007/BF01011311