On the absence of global weak solutions for a nonlinear time-fractional Schr\"odinger equation

In this paper, an initial value problem for a nonlinear time-fractional Schr"odinger equation with a singular logarithmic potential term is investigated. The considered problem involves the left/forward Hadamard-Caputo fractional derivative with respect to the time variable. Using the test function method with a judicious choice of the test function, we obtain sufficient criteria for the absence of global weak solutions.