Pointwise decay for radial solutions of the Schrödinger equation with a repulsive Coulomb potential

Abstract: We study the long-time behavior of solutions to the Schr\"odinger equation with a repulsive Coulomb potential on $\mathbb{R}^3$ for spherically symmetric initial data. Our approach involves computing the distorted Fourier transform of the action of the associated Hamiltonian $H=-\Delta+\frac{q}{|x|}$ on radial data $f$, which allows us to explicitly write the evolution $e^{itH}f$. A comprehensive analysis of the kernel is then used to establish that, for large times, $|e^{i t H}f|{L^{\infty}} \leq C t^{-\frac{3}{2}}|f|{L^1}$. Our analysis of the distorted Fourier transform is expected to have applications to other long-range repulsive problems.