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Weak error analysis for a nonlinear SPDE approximation of the Dean-Kawasaki equation

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arxiv 2212.11714 v1 pith:A4HVGXNB submitted 2022-12-22 math.PR

classification math.PR
keywords dean-kawasakinonlinearapproximationequationerrorspdeweakanalysis
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abstract

We consider a nonlinear SPDE approximation of the Dean-Kawasaki equation for independent particles. Our approximation satisfies the physical constraints of the particle system, i.e. its solution is a probability measure for all times (preservation of positivity and mass conservation). Using a duality argument, we prove that the weak error between particle system and nonlinear SPDE is of the order $N^{-1-1/(d/2+1)}\log (N)$. Along the way we show well-posedness, a comparison principle and an entropy estimate for a class of nonlinear regularized Dean-Kawasaki equations with It\^o noise. Keywords: Dean-Kawasaki equation, weak error analysis, Laplace duality

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  1. Small noise fluctuations and large deviations of conservative SPDEs with Dirichlet boundary conditions

    math.PR 2025-04 conditional novelty 6.0 of 10

    Small-noise fluctuations and large deviations of generalized Dean-Kawasaki SPDEs are characterized on C^2 bounded domains with Dirichlet boundary conditions.

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