arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1905.04583math.AP
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非定常薛定谔方程均匀化的算子误差估计:时间依赖性

Operator error estimates for homogenization of the nonstationary Schrödinger-type equations: dependence on time

Mark Dorodnyi

摘要:

在$L_2 (\mathbb{R}^d; \mathbb{C}^n)$中,我们考虑了周期系数依赖于$\mathbf{x}/\varepsilon$的自伴矩阵强椭圆二阶微分算子$\mathcal{A}_\varepsilon$.我们发现的指数近似$e^{-i τ\mathcal{A}_\varepsilon}$,$τ\in \mathbb{R}$,小$\varepsilon$在($H^s \to L_2$)-运营商规范与适当的$s$。讨论了$τ$的误差估计的锐度。将所得结果应用于研究Schrödinger型方程$i\partial_τ \mathbf{u}_\varepsilon = \mathcal{A}_\varepsilon \mathbf{u}_\varepsilon + \mathbf{F}$ 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 a selfadjoint matrix strongly elliptic second order differential operator $\mathcal{A}_\varepsilon$ with periodic coefficients depending on $\mathbf{x}/\varepsilon$. We find approximations of the exponential $e^{-i τ\mathcal{A}_\varepsilon}$, $τ\in \mathbb{R}$, for small $\varepsilon$ in the ($H^s \to L_2$)-operator norm with suitable $s$. The sharpness of the error estimates with respect to $τ$ is discussed. The results are applied to study the behavior of the solution $\mathbf{u}_\varepsilon$ of the Cauchy problem for the Schrödinger-type equation $i\partial_τ \mathbf{u}_\varepsilon = \mathcal{A}_\varepsilon \mathbf{u}_\varepsilon + \mathbf{F}$.

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