A fractional analysis in higher dimensions for the Sturm-Liouville problem

• Main Author: Ferreira, M.
• Publication Date: 2021
• Other Authors: Rodrigues, M. M., Vieira, N.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://hdl.handle.net/10773/31250
• topic: Fractional derivatives; Fractional Sturm-Liouville problem; Fractional variational calculus; Eigenvalue problem; Eigenfunctions; Fractional Clifford analysis

In this work, we consider the n-dimensional fractional Sturm-Liouville eigenvalue problem, by using fractional versions of the gradient operator involving left and right Riemann-Liouville fractional derivatives. We study the main properties of the eigenfunctions and the eigenvalues of the associated fractional boundary problem. More precisely, we show that the eigenfunctions are orthogonal and the eigenvalues are real and simple. Moreover, using techniques from fractional variational calculus, we prove in the main result that the eigenvalues are separated and form an infinite sequence, where the eigenvalues can be ordered according to increasing magnitude. Finally, a connection with Clifford analysis is established.