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首页> 外文期刊>Fractional Calculus and Applied Analysis >REGULARITY OF SOLUTIONS TO SPACE-TIME FRACTIONAL WAVE EQUATIONS: A PDE APPROACH
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REGULARITY OF SOLUTIONS TO SPACE-TIME FRACTIONAL WAVE EQUATIONS: A PDE APPROACH

机译:时空分数阶波动方程解的正则性:偏微分方程方法

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摘要

We consider an evolution equation involving the fractional powers, of order s is an element of ( 0, 1), of a symmetric and uniformly elliptic second order operator and Caputo fractional time derivative of order gamma is an element of(1, 2. Since it has been shown useful for the design of numerical techniques for related problems, we also consider a quasi-stationary elliptic problem that comes from the realization of the spatial fractional diffusion as the Dirichlet-to-Neumann map for a nonuniformly elliptic problem posed on a semi-infinite cylinder. We provide existence and uniqueness results together with energy estimates for both problems. In addition, we derive regularity estimates both in time and space; the time-regularity results show that the usual assumptions made in the numerical analysis literature are problematic.
机译:我们考虑一个涉及分数幂的演化方程,s 阶是对称且均匀椭圆的二阶算子的 (0, 1) 的元素,而 gamma 阶的 Caputo 分数阶时间导数是 (1, 2) 的元素。由于它已被证明可用于设计相关问题的数值技术,我们还考虑了一个准稳态椭圆问题,该问题来自空间分数扩散的实现,作为在半无限圆柱体上提出的非均匀椭圆问题的狄利克雷到诺依曼映射。我们提供存在性和唯一性结果以及这两个问题的能量估计。此外,我们推导了时间和空间的规律性估计;时间正则性结果表明,数值分析文献中通常的假设是有问题的。

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