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arXiv 1908.02137math.AP
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图上wave equation解的存在性

The existence of the solution of the wave equation on graphs

Yong Lin, Yuanyuan Xie

摘要:

设$G=(V, E)$是一个有限权图,$Ω\subseteq V$是一个域,使得$Ω^\circ\neq\emptyset$ .本文研究了非齐次波动方程\begin{equation*} \left\{ \begin{aligned} &\partial_t^2 u(t,x)-Δ_Ωu(t,x)=f(t,x),\qquad&&(t,x)\in[0,\infty)\times Ω^\circ,\\ &u(0,x)=g(x),\qquad&& x\inΩ^\circ,\\ &\partial_tu(0,x)=h(x),\qquad&& x\inΩ^\circ,\\ &u(t,x)=0,\qquad&&(t,x)\in[0,\infty)\times\partial Ω, \end{aligned} \right. \end{equation*}的如下初边值问题,其中$Δ_Ω$表示$Ω^\circ$上的Dirichlet Laplacian算子.利用Rothe方法,我们证明了上述波动方程有唯一解.

英文摘要:

Let $G=(V, E)$ be a finite weighted graph, and $Ω\subseteq V$ be a domain such that $Ω^\circ\neq\emptyset$. In this paper, we study the following initial boundary problem for the non-homogenous wave equation \begin{equation*} \left\{ \begin{aligned} &\partial_t^2 u(t,x)-Δ_Ωu(t,x)=f(t,x),\qquad&&(t,x)\in[0,\infty)\times Ω^\circ,\\ &u(0,x)=g(x),\qquad&& x\inΩ^\circ,\\ &\partial_tu(0,x)=h(x),\qquad&& x\inΩ^\circ,\\ &u(t,x)=0,\qquad&&(t,x)\in[0,\infty)\times\partial Ω, \end{aligned} \right. \end{equation*} where $Δ_Ω$ denotes the Dirichlet Laplacian on $Ω^\circ$. Using Rothe's method, we prove that the above wave equation has a unique solution.

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