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arXiv 2004.06927math.PR
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带乘性输运噪声的随机mSQG方程:白噪声解和标度极限

Stochastic mSQG equations with multiplicative transport noises: white noise solutions and scaling limit

Dejun Luo, Rongchan Zhu

摘要:

本文研究了二维环面$\mathbb{T}^2$上的修正表面准地转(mSQG)方程,该方程受乘性输运噪声扰动.该方程允许$\mathbb{T}^2$上的白噪声测度作为不变测度。首先利用点涡近似方法证明了该随机方程的白噪声解的存在性,然后在适当的噪声尺度限制下,证明了该解弱收敛于时空白噪声驱动的耗散mSQG方程的唯一稳态解.利用Gubinelli和Perkowski在\cite{GP-18}中的方法,证明了后一方程的弱唯一性.

英文摘要:

We consider the modified Surface Quasi-Geostrophic (mSQG) equation on the 2D torus $\mathbb{T}^2$, perturbed by multiplicative transport noise. The equation admits the white noise measure on $\mathbb{T}^2$ as the invariant measure. We first prove the existence of white noise solutions to the stochastic equation via the method of point vortex approximation, then, under a suitable scaling limit of the noise, we show that the solutions converge weakly to the unique stationary solution of the dissipative mSQG equation driven by space-time white noise. The weak uniqueness of the latter equation is also proved by following Gubinelli and Perkowski's approach in \cite{GP-18}.

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