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arXiv 1202.3181math.AP
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具有大随机势的Schroedinger方程的均匀化

Homogenization of the Schroedinger equation with large, random potential

Ningyao Zhang, Guillaume Bal

摘要:

研究了一类具有大的、快速振荡的、平均为零的、高斯分布的随机势的Schr{<$}dinger方程解的行为.我们证明了在高维$d>\mathfrak{m}$中,当关联长度$\varepsilon$趋于0时,解在$L^2$意义下在有限区间上一致收敛到确定性薛定谔方程的解,其中$\mathfrak{m}$是薛定谔方程中空间伪微分算子的阶($\mathfrak{m}=2$是标准拉普拉斯算子).这推广到长时间的收敛性结果获得的短时间和热方程。结果是基于多次散射贡献的仔细分解。在$d<\mathfrak{m}$维中,随机解收敛于随机偏微分方程的解。

英文摘要:

We study the behavior of solutions to a Schr{ö}dinger equation with large, rapidly oscillating, mean zero, random potential with Gaussian distribution. We show that in high dimension $d>\mathfrak{m}$, where $\mathfrak{m}$ is the order of the spatial pseudo-differential operator in the Schr{ö}dinger equation (with $\mathfrak{m}=2$ for the standard Laplace operator), the solution converges in the $L^2$ sense uniformly in time over finite intervals to the solution of a deterministic Schr{ö}dinger equation as the correlation length $\varepsilon$ tends to 0. This generalizes to long times the convergence results obtained for short times and for the heat equation. The result is based on a careful decomposition of multiple scattering contributions. In dimension $d<\mathfrak{m}$, the random solution converges to the solution of a stochastic partial differential equation.

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