Local/global well-posedness analysis of time-space fractional Schrödinger equation on ${\mathbb{R}}^d$

Abstract

We investigate a class of nonlinear time-space fractional Schrödinger equations with nonlocal effects in both time and space. The time derivative is of Achar type, and the space operator is a $\varphi (-\Delta )$-type operator defined via a Bernstein function $\varphi$. This nonlocality invalidates classical Strichartz estimates. By combining asymptotic analysis of Mittag-Leffler functions, the Hörmander multiplier theorem, and harmonic analysis techniques, we establish a Gagliardo-Nirenberg inequality in $\varphi$-Triebel-Lizorkin spaces and derive key Sobolev estimates for the solution operator. These analyses yield the local and global well-posedness of the equations in appropriate Banach spaces. Our work demonstrates the effectiveness of the $\varphi (-\Delta )$-framework for handling fractional dispersive equations with nonlocality.

34 pages