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arXiv 1508.07641math.AP
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具有周期系数的非定常薛定谔型方程的均匀化

Homogenization of nonstationary Schrödinger type equations with periodic coefficients

Tatiana Suslina

摘要:

在$L_2(\mathbb{R}^d;{\mathbb C}^n)$中,我们考虑了周期系数依赖于${\mathbf x}/\varepsilon$的自伴强椭圆二阶微分算子${\mathcal A}_\varepsilon$.我们研究了小$\varepsilon$的算子指数$\exp(-i {\mathcal A}_\varepsilon τ)$,$τ\in {\mathbb R}$的行为。近似这个指数的$(H^s\to L_2)$ -运营商规范与一个合适的$s$。应用所得结果研究了Schr dinger型方程$i \partial_τ{\mathbf u}_\varepsilon = {\mathcal A}_\varepsilon {\mathbf u}_\varepsilon$ Cauchy问题解${\mathbf u}_\varepsilon$的性质.

英文摘要:

In $L_2(\mathbb{R}^d;{\mathbb C}^n)$ we consider selfadjoint strongly elliptic second order differential operators ${\mathcal A}_\varepsilon$ with periodic coefficients depending on ${\mathbf x}/\varepsilon$. We study the behavior of the operator exponential $\exp(-i {\mathcal A}_\varepsilon τ)$, $τ\in {\mathbb R}$, for small $\varepsilon$. Approximations for this exponential in the $(H^s\to L_2)$-operator norm with a suitable $s$ are obtained. The results are applied to study the behavior of the solution ${\mathbf u}_\varepsilon$ of the Cauchy problem for the Schrödinger type equation $i \partial_τ{\mathbf u}_\varepsilon = {\mathcal A}_\varepsilon {\mathbf u}_\varepsilon$.

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