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Derivation of Coupled KPZ Equations from Interacting Diffusions Driven by a Single-Site Potential

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Abstract

The Kardar-Parisi-Zhang (KPZ) equation is a stochastic partial differential equation which is derived from various microscopic models, and to establish a robust way to derive the KPZ equation is a fundamental problem both in mathematics and in physics. As a microscopic model, we consider multi-species interacting diffusion processes, whose dynamics is driven by a nonlinear potential which satisfies some regularity conditions. In particular, we study asymptotic behavior of fluctuation fields associated with the processes in the high temperature regime under equilibrium. As a main result, we show that when the characteristic speed of each species is the same, the family of the fluctuation fields seen in moving frame with this speed converges to the coupled KPZ equations. Our approach is based on a Taylor expansion argument which extracts the harmonic potential as a main part. This argument works without assuming a specific form of the potential and thereby the coupled KPZ equations are derived in a robust way.

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Notes

  1. Here we only give a heuristic description of the hydrodynamics, but it would be possible to justify all the computations in rigorous ways, according to standard methods, i.e., the entropy method or the relative entropy method, see [26] for more details.

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Acknowledgements

This work was supported by JSPS KAKENHI Grant Number JP22J12607 and the Research Institute for Mathematical Sciences, an International Joint Usage/Research Center located in Kyoto University. Additionally, the author would like to thank Makiko Sasada and Hayate Suda for giving him fruitful comments and suggestions.

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  1. RIKEN Interdisciplinary Theoretical and Mathematical Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan

    Kohei Hayashi

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  1. Kohei Hayashi
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Correspondence to Kohei Hayashi.

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Communicated by Herbert Spohn.

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Hayashi, K. Derivation of Coupled KPZ Equations from Interacting Diffusions Driven by a Single-Site Potential. J Stat Phys 191, 85 (2024). https://doi.org/10.1007/s10955-024-03302-y

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