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arXiv 1803.03556math.NAcs.NA
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Jacobi-Galerkin谱方法用于Riesz分数微分方程的本征值问题

Jacobi-Galerkin spectral method for eigenvalue problems of Riesz fractional differential equations

Beijing Computational Sciences and Research Center(北京计算科学研究中心);Division of Applied Mathematics, Brown University(布朗大学应用数学系);State Key Laboratory of Computer Science/Laboratory of Parallel Computing, Institute of Software, Chinese Academy of Sciences(中国科学院软件研究所)

Lizhen Chen, Zhiping Mao, Huiyuan Li

AI总结:

本文提出高效Jacobi-Galerkin谱方法计算Riesz分数偏微分方程的本征值,通过Sobolev空间保持对称性和正定性,证明Poincaré不等式并建立条件数估计,结合近似理论获得误差估计,数值结果验证了精度与收敛阶。

摘要:

本文提出了一种高效的Jacobi-Galerkin谱方法,用于计算具有齐次Dirichlet边界值的Riesz分数偏微分方程的本征值。为了保持离散线性系统对称性和正定性,我们引入了某些适当定义的Sobolev空间,并在标准Galerkin弱形式中近似本征值问题,而不是文献中的Petrov-Galerkin形式。证明了所提出的Galerkin形式的Poincaré和逆不等式,最终帮助我们建立了代数系统条件数的精确估计。通过使用Babuška和Osborn的近似理论,对自共轭和正定的本征值问题进行了严格的误差估计。展示了数值结果以证明精度和效率,并验证了渐近指数收敛阶。此外,观察到Riesz分数微分算子的第n个本征值λ_n的Weyl型渐近律λ_n=O(n^{2α}),以及关于多项式次数N的代数系统的条件数N^{4α}。

英文摘要:

An efficient Jacobi-Galerkin spectral method for calculating eigenvalues of Riesz fractional partial differential equations with homogeneous Dirichlet boundary values is proposed in this paper. In order to retain the symmetry and positive definiteness of the discrete linear system, we introduce some properly defined Sobolev spaces and approximate the eigenvalue problem in a standard Galerkin weak formulation instead of the Petrov-Galerkin one as in literature. Poincaré and inverse inequalities are proved for the proposed Galerkin formulation which finally help us establishing a sharp estimate on the algebraic system's condition number. Rigorous error estimates of the eigenvalues and eigenvectors are then readily obtained by using Babuška and Osborn's approximation theory on self-adjoint and positive-definite eigenvalue problems. Numerical results are presented to demonstrate the accuracy and efficiency, and to validate the asymptotically exponential oder of convergence. Moreover, the Weyl-type asymptotic law $ λ_n=\mathcal{O}(n^{2α})$ for the $n$-th eigenvalue $λ_n$ of the Riesz fractional differential operator of order $2α$, and the condition number $N^{4α}$ of its algebraic system with respect to the polynomial degree $N$ are observed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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