Analysis of a class of completely non-local elliptic diffusion operators

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-02-29 DOI:10.1007/s13540-024-00254-8
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Abstract

This work explores the possibility of developing the analog of some classic results from elliptic PDEs for a class of fractional ODEs involving the composition of both left- and right-sided Riemann-Liouville (R-L) fractional derivatives, \({D^\alpha _{a+}}{D^\beta _{b-}}\) , \(1<\alpha +\beta <2\) . Compared to one-sided non-local R-L derivatives, these composite operators are completely non-local, which means that the evaluation of \({D^\alpha _{a+}}{D^\beta _{b-}}u(x)\) at a point x will have to retrieve the information not only to the left of x all the way to the left boundary but also to the right up to the right boundary, simultaneously. Therefore, only limited tools can be applied to such a situation, which is the most challenging part of the work. To overcome this, we do the analysis from a non-traditional perspective and eventually establish elliptic-type results, including Hopf’s Lemma and maximum principles. As \(\alpha \rightarrow 1^-\) or \(\alpha ,\beta \rightarrow 1^-\) , those operators reduce to the one-sided fractional diffusion operator and the classic diffusion operator, respectively. For these reasons, we still refer to them as “elliptic diffusion operators", however, without any physical interpretation.

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一类完全非局部椭圆扩散算子的分析
Abstract This work explores the possibility of developing the analog of some classic results from elliptic PDEs for a class of fractional ODEs involving the composition of both left-side and right-sided Riemann-Liouville (R-L) fractional derivatives, \({D^\alpha _{a+}}{D^\beta _{b-}}) , \(1<\alpha +\beta <2\) .与单边非局部 R-L 导数相比,这些复合算子是完全非局部的,这意味着在对 x 点的\({D^\alpha _{a+}}{D^\beta _{b-}}u(x)\) 求值时,不仅要检索 x 左侧一直到左边界的信息,还要同时检索右侧一直到右边界的信息。因此,在这种情况下只能使用有限的工具,这也是这项工作最具挑战性的部分。为了克服这个问题,我们从非传统的角度进行分析,最终建立了椭圆型结果,包括霍普夫定理和最大原则。作为 \(\alpha \rightarrow 1^-\) 或 \(\alpha ,\beta \rightarrow 1^-\) ,这些算子分别简化为单边分数扩散算子和经典扩散算子。由于这些原因,我们仍然称它们为 "椭圆扩散算子",但没有任何物理解释。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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